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Thermo Products CDX1-125N Furnace User Manual

1. WD 537 W j AM SCHEMA WDSS aa WIRING DIAGRAM SCHEMATIC a ri m R CHX1 75 100 12 f A CDX1 75 100 125 UN Go USED ON CHX CDX E 100 amp 125 ONLY 14 4 POWER S ICM 2 BLOWER MOTOR OOR M SWITCH BLACK BACK BLACK BLACK TI L WHITE GREEN OPTIONAL amp BLACK m HUMIDIFIER F ru anp 5 BRENDA Tj GLINE EAC HUM HUM LINE FAC 11 OPTIONAL D XFMR CIRC XFMR CIRC TRANSFORMER N ELECTRONIC AIR 5 CLEANER HOT LAA Y Y J ae 24y YELLOW YELLOW V61 5061145 THERMOSTAT SHUNT YELLOW GREY PURPLE BROWN SE WHITE GOO BLUE DOO ORANGE efc Gal GREEN RED wo mo ES 77 BK IW Wi G Y o E Jui 85895988 ATAMA Hn RED Justo ON CDX OPTIONAL x Jonas ONLY A C CONTACTOR t
2. st E d at REQ D CHX1 75 amp 100 ONLY NOTE SEE SPECIFICATION SECTION OF THIS MANUAL FOR PART NUMBERS RELATED TO PARTS PACKAGE COMPONENTS 48 All installations and services must be performed by qualified service personnel CHX1 75N CHX1 10 ITEM PART NO QTY PART NO PART NO QTY 38116 4 38128 38129 2 3 0926 1 10721 4 0925 5 20105 1 5 d PANEL 0929 8 PLENUM STRIPS 13382 2 2 2 9 1 0770 1 10 ESS DOOR 20718 1 11 HEAT 7 14 SUPPORT 2394 12394 15 BLOWER PAN 28119 1 281 28177 17 7 18 19 1 20 1 21 2 2 320157 2 22 1 24 INDUC 25 INDUCER GASKE 26 FILTER 4 330141 WIDE BURNER T 5 5 4 5 30 GAS VALVE NA 380659 31 ORIFICE 380600 3 4 5 33 BUTTON PLUG 350046 2 2 2 34 38 39 IGNITER 380650 COVER 3 1 41 42 0860 43 LIMIT 350473 1 350473 44 HARNESS 350853 350853 1 HARNESS 35085 1 85 CONTROL IN 350847 47 48 PRESSURE SWITCH DUAL 350861 1 5508
3. X Y SILCONE TYPE CAULKING COMPOUND BURNER BOX MUST BE USED TO SEAL THESE NTS w 25 G HOSE BARB FOR THE DRAIN TEE MBLY IS LOCATED IN THE PARTS PACKAGE ST BE FIELD INSTALLED A RIGHI SIDE HORIZONTAL APPLICATION Figure 8 2 CONNECTING THE EXHAUST VENT TO THE INDUCER Insert the end of the 2 dia PVC elbow 2 dia PVC tee assembly for CDX1 horizontal installations onto the outlet of the inducer blower assembly Measure the length of 2 dia PVC pipe needed to clear the furnace side casing while allowing for the 2 3 8 rubber radiator hose to be installed within the casing of the furnace Cut the 2 dia PVC measured lengths and be sure to allow sufficient length of pipe for connections Refer to Figures 9 10 and 11 NOTE For CDX series units a length of 2 dia PVC pipe and 2 dia PVC tee assembly are supplied with the unit For the CDX1 100 and CDX1 125 units a 2 x 3 dia PVC reducer is also supplied 16 All installations and services must be performed by qualified service personnel IMPORTANT Horizontal installations of CDX1 100 and CDX1 125 units must utilize the 2 x 3 dia PVC reducer as soon as the vent inlet exits the side casing of the unit The CDX1 100 and CDX1 125 series units must be vented with 3 dia PVC Refer to Figure 8 b After preparation of the 2 P
4. All installations and services must be performed by qualified service personnel Modifications to ECM blower speed settings are done using the S3 and S4 dip switch controls Labeled 1 to 8 in Figure 21 Thermo Pride two stage furnaces are factory shipped at the CFM settings listed below in Table 4 2 Stage Blower Settings from factory Table 4 Control Board Heating Heating Unit Dip Switch MM Fan EN Settings low fire high fire 1 7 Off CDX1 75 i 885 1012 500 1000 CHX1 75 1 8 Off 760 931 500 1000 CDX1 100 or 1094 1340 600 1200 On CHX1 100 1 8 Off 1015 1243 600 1200 CDX1 125 1366 1673 700 1400 8 On CHX1 125 1 8 Off 1270 1556 700 1400 For adjustments to the Cooling CFM settings as well as all additional CFM changes please reference the dip switch tables listed in the ECM operation manual Included with every furnace 5 FIELD WIRING AND REPLACING WIRING Field wiring between the furnace and devices not attached to the furnace shall conform with the temperature limitation for Type T wire 63 F rise 35 when installed in accordance with the manufacturer s instructions If any of the original factory supplied furnace wiring is replaced or a separate device other than the thermostat is wired internal to the unit 105 C thermoplastic or equivalent wire must be used 28 All installations and services must be performed by qualified service personnel IV
5. METER Y v II IL TI ORCED MN 1 4 L AIR INLET 12 MINA TOP VENT HOOD 5 Figure 4 A CAUTION The vent and air intake elbows must be kept away from bushes shrubs or any vegetation that may restrict the flow of flue products It must also be kept clear of any leaves weeds or other combustible materials Keep the vent hood clear of snow Avoid locating the terminals in areas where standing water or condensate drippage may be a problem VENT TERMINAL LOCATION GUIDELINES In addition to following the requirements outlined by local codes utilizing the guidelines below when possible in locating the vent terminal will help insure the trouble free operation of your horizontally vented furnace e Avoid locating the vent terminal on a wall facing the prevailing winds and wide open areas e When this is not practical choose locations that protect the vent from strong winds such as behind a fence or hedge NOTICE The vent terminal must be located a sufficient distance from bushes shrubs and vegetation so as not to have the flue products restricted or blocked from such vegetation e areas with considerable snowfall it is advisable to locate the vent terminal higher than the minimum 12 in above the ground as to prevent blockage by snow accumulation or drifting Measures should be taken to prevent the entry of corrosive chemicals or vapors to the combusti
6. sss UNIT CDX1 75N CDX1 100N CDX1 125N parts k DESCRIPTION PART NO ary PART NO ary PART NO qm 1 HEAT EXCHANGER 38118 1 38126 1 38127 1 2 BLOWER ASSEMBLY SO0S4115 1 50054116 1 50054117 1 3 BASE 18121 1 10775 1 10776 1 4 CASING BACK 10931 1 10732 1 10733 1 5 SIDE CASING RIGHT 20107 1 20107 1 20107 1 6 SIDE CASING LEFT 20106 1 20105 1 20106 1 7 TOP CENTER PANEL 18124 1 10737 1 10738 1 8 PLENUM STRIPS 13403 2 13403 2 13403 2 9 FRONT DOOR 20932 1 20728 1 20730 1 10 BLOWER ACCESS DOOR 10930 1 10727 1 10729 1 11 PLATE 18172 1 18174 1 18175 1 12 INDUCTOR POWER CHOKE 350855 1 350856 1 13 14 FRONT CENTER PANEL 10928 1 10753 1 10754 1 15 BLOWER PAN 28120 1 28178 1 28179 1 16 COIL SUPPORT 22385 1 22385 2 22385 2 17 LIMIT SWITCH ROLLOUT 350485 1 350485 1 350485 1 a u s MOTOR 350849 1 350849 1 350849 1 ig WIRE HARNESS MOTOR 350850 1 350850 1 350850 1 20 SIDE CASING ANGLE 14398 1 mum 21 DOOR PULL 320157 2 320157 2 320157 2 22 SIGHT GLASS GASKET 330135 1 330135 1 330135 1 23 SIGHT GLASS 15887 1 15887 1 15887 1 24 INDUCER 340336 1 340336 1 340336 1 25 INDUCER GASKET 330148 1 330148 1 330148 1 26 FILTER E 2 ed 2 mee 2 27 Ste IN WS ASKED 28 50 330141 33 75 330141 39 50 28 SKET 330140 26 50 330140 32 25 330140 38 29 BURNER TUBE 380595 3 380595 4 380595 5 30 GAS 380659 1 380659 1 380659 1 31
7. COMBUSTION AIR INLET VENT OUTLET CONFIGURATION NON DIRECT VEN 12 4 MIN N BE OUTSIDE STRUCTURE 18 2 M APPLICATION STION AIR AINATION ELBOW PO NTING DOWN All installations and services must be performed by qualified service personnel NOTICE If exterior sidewall building materials are subject to degradation from flue gases or moisture a minimum 12 diameter shield made from stainless steel or high density plastic shall be used for protection 2 The PVC vent termination elbow must be installed in accord with local codes and these instructions The bottom edge of the vent termination elbow must be installed at least 12 in above the outlet of the combustion air intake termination elbow and must be installed in the same atmospheric pressure zone i e on the same wall lt is recommended that the horizontal distance between the inlet and flue termination be kept to a minimum when possible and not exceed 24 in apart The vent and air intake should utilize the same numbers of elbows and approximately the same length of straight pipe to reach the outside termination elbows See Figures 2 amp 3 NOTE THE HORIZONTAL DISTANCE BETWEEN INLET THE OUTLET SHOULI ENT BE KEPT MINIMUM TO PREVENT RECIRCULATION 12 INCH MIN FROM THE BOTTOM OF FLUE OUTLET TO THE AIR INLET ITSELF Figure 3 VENT TERMINAL LOCATION REQUIREMEN
8. SAFETY INFORMATION This and the following page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces Please read and comply with the contents of these labels SERIAL NO DIRECT VENT FORCED AIR FURNACE FOR INDOOR INSTALLATION IN BUILDING CONSTRUCTED ON SITE CONFORMS TO ANS 221 475 CSA 2 3b 2000 CENTRAL FURN CATEGORY IV TYPE FSP BFFiCIBNCY ING 115V 1PH 60CY MAX TOTAL INPUT AMPS INPUT BTUH HIGH FIRE NAT GAS LOW FIRE NORMAL MANIFOLD PRESSURE HIGH FIRE INCHES W C LOW FIRE MIN GAS SUPPLY PRESSURE FOR INPUT ADJUSTMENT IN W C MAX GAS SUPPLY PRESSURE14 0 INCHES W C AIR TEMPERATURE RISE HIGH FIRE 55 F TO 85 F LOW FIRE 45 F TO 75 F MAX EXTERNAL STATIC PRESSURE INCHES W C MAXIMUM OUTLET AIR TEMPERATURE PF CERTIFIED FOR CLOSET INSTALLATION AT MINIMUM CLEARANCES TO COMBUSTIBLE CONSTRUCTION AS SHOWN TOP FRONT BACK LS RS FLUE PIPE INCHES 1 5 0 0 0 FOR INSTALLATION N COMBUSTIBLE FLOORING THIS FURNACE REQUIRES A SPECIAL VENTING SYSTEM REFER TO INSTALLATION INSTRUCTIONS NO MG 1010 FOR PARTS LIST AND METHOD OF INSTALLATION MAX VENT LENGTH 35 FEET MIN VENT LENGTHB FEET MIN WALL THICKNESS THROUGH WHICH THE VENT AIR INTAKE PIPES MAY PASS IS 2 INCHES AND THE MAX IS 18 INCHES FILTERS MUST BE INSTALLED EXTERNAL TO THE FURNACE CASING THIS FURNACE MUST BE INSTALLED IN ACCORDANCE WITH THERMO PRODUCTS INSTRUCTIONS AND
9. 90 ELBOW CDX1 75 IN SCHED 40 PVC 90 ELBOW CDX1 100 125 BLACK COATED 8 x 3 4 TEK SCREWS SUPPLIED W UNIT NOTE THE HOSE BARB FOR THE DRAIN TEE ASSEMBLY IS LOCATED IN THE PARTS PACKAGE AND MUST BE FIELD INSTALLED s SILCONE TYPE CAULKING COMPOUND MUST BE USED TO SEAL THESE JOINTS PVC CEMENT NOT SHOWN MUST BE USED TO SEAL ALL OTHER JOINTS EXCEPT AS NOTED BASIC VENT CONNECTION CDX1 SERIES Figure 7 15 NOTE DO NOT USE SEALANT AT CONNECTION TO METAL INLET INDUCER BLOWER All installations and services must be performed by qualified service personnel REQUIRED FOR INLET CONNECTION 40 PVC PIPE SLEEVE PVC COUPLING V 3 IN SCHED 40 PVC PIPE S S NOTE LENGTH IS DEPENDENT OP IS ON NOTE DO NOT USE SFALANT AT TO METAI NLET OF BURNER BOX THE SC PVC VENT INLET PIPE 1 4 PER FOOT FROM BEGIN HORIZONTAL RUN TO OUTDOOR V B 2 IN SCHED 40 PVC PIPE SUPPLIED W SED ON CDX 1 7 VC PIPE USED ON CDX1 1 D 4 55 5 IN 25 ONLY ZO E 2 IN X 3 IN PVC REDUCER SUPPLIED W UNIT USED ON CDX1 100 125 ONLY RADIATOR HOS SUPPLIED AND 2 SPRING CLAMPS JNIT G 2 IN DRAIN TEE ASSEMBLY SUPPLIED W UNIT 2 IN SCHED 40 PVC SCHED 40
10. ONE MORE RETRY WILL BE MADE BEFORE THE 50V61 143 GOES INTO SYSTEM LOCKOUT IF FLAME IS DETECTED THEN LOST THE 50V61 143 WILL REPEAT THE INITIAL IGNITION SEQUENCE FOR A TOTAL OF TEN RECYCLES AFTER TEN UNSUCCESSFUL RECYCLE ATTEMPTS THE CONTROL WILL GO INTO SYSTEM LOCKOUT 30 All installations and services must be performed by qualified service personnel IF SYSTEM IS IN LOCKOUT THE MODULE WILL RESET IF THERMOSTAT ITSELF AFTER 60 MINUTES W2 CONTACTS OR MAY BE MANUALLY ARE CLOSED RESET BY INTERRUPTING THE POWER TO THE FURNACE AT THE DISCONNECT OR INTERRUPTING THE CALL FOR HEAT AT THE THERMOSTAT IF THIS DOES NOT RESTART OTHERWISE THE SYSTEM REFER TO THE TROUBLESHOOTING SECTION OF THIS MANUAL Y AFTER DELAY TO FAN ON PERIOD ENDS 45 SECONDS CIRCULATING AIR FAN IS ENERGIZED AT LOW FIRE HEATING SPEED OR HIGH FIRE IF W2 IS ENERGIZED THE CALL S OPTIONAL ELECTRONIC AIR FOR i CLEANER AND HUMIDIFIER HIGH ARE ENERGIZED FIRE GAS VALVE INDUCER AND AIR FAN ARE ENERGIZED TO HIGH FIRE SETTINGS NO CALL FOR WHEN THERMOSTAT HAS HIGH FIRE SATISFIED W2 CONTACTS OPEN AND THE GAS VALVE AND AIR FAN HIGH FIRE SETTINGS ARE DE ENERGIZED AFTER 30 SECOND DELAY y WHEN THERMOSTAT W1 IS SATISFIED CONTACTS OPEN AND THE GAS VALVE IS DE ENERGIZED AFTER PROOF OF FLAME LOSS INDUCER lt STARTS 5 SECOND P
11. SMELL GAS Do not try to light any appliance Do not touch any electric switch do not use any phone in your building Immediately your gas supplier from a neighbor s phone Foliow the gas supplier s instructions If you cannot reach your gas suppiier call the fire department C Use only your hand to push in or turn the gas control knob or move the gas control switch Never use tools If the knob will not push in or turn or the switch will not move by hand don t try to repair it call a qualified service technician Force or attempted repair may result in a fire or explosion gt gt ra us lt lt mx oc 2 2 gt gt a oc E a e lt S e 2 o o e z a DO NOT USE ANY PHONE IN YOUR BUILDING 3 IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR S PHONE FOLLOW THE 1 DO NOT TRY TO LIGHT ANY APPLIANCE 2 DO NOT TOUCH ANY ELECTRICAL SWITCH GAS SUPPLIER S INSTRUCTIONS 4 IF YOU CANNOT REACH YOUR GAS SUPPLIER CALL THE FIRE DEPARTMENT VICINITY OF THIS OR ANY OTHER APPLIANCE THIS UNIT MUST BE INSTALLED AND SERVICED BY A QUALIFIED CONTRACTOR ONLY OPERATING INSTRUCTIONS ARE LOCATED INSIDE APPLIANCE NEAR BURNER ASSEMBLY WHAT TO DO IF YOU SMELL GAS FLAMMABLE VAPORS AND LIQUIDS IN THE I JPPLIER fe 3 Turn off ali electric power to the appliance 4 This appliance is equip
12. SORTEOS DOES GAS VALVE OPEN FLAME PROVING PERIOD AFTER IGNITOR WARM UP IS THERE 24 VOLTS YES CHECK DRAIN FOR IS COLLECTOR BOX NO BLOCKAGE WATER VES PRESSURE SWITCH CLOSED TRAPPED IN HOSE REPLACE SWITCH YES CHECK WIRING TO GAS VALVE AND IF OK REPLACE GAS VALVE ANER NO AND MANIFOLD PRESSURE EUER IONE gt REFERENCE GAS PRESSURE i CHART PAGE 31 YES OK 44 All installations and services must be performed by qualified service personnel IS IGNITOR NO REPOSITION TO POSITIONED CORRECTLY CORRECT LOCATION YES CHECK AND CLEAN BURNERS CHECK FOR PROPER LINE NO AND MANIFOLD PRESSURE REFERENCE GAS PRESSURE CHART PAGE 31 DO BURNERS STAY LIT PAST PROOF OF FLAME CHECK OK CHECK FLAME PROB2 AND WIRE AND CHECK POLARITY ON INCOMING POWER AND GROUND YES IS THERE LINE EE veg DOES INDUCER VOLTAGE ACROSS NO REPLACE IS W2 ENERGIZED GO TO INDUCER POWER THE 50V61 143 HIGH SPEED TERMINALS IND HI CONTROL TO IND N YES CHECK CONNECTIONS YES TO INDUCER IF OK REPLACE INDUCER NO CHECK CONTACTS Y IN HIGH FIRE SWITCH DOES BURNER NO Mas aa UL AND FOR STEP TO HIGH FIRE CLOSED BLOCKAGE IN j FLUE IF OK REPLACE DUAL PRESSURE YES YES SWITCH 45 All installations and services must be performed by qualified service personnel IS THERE 24
13. a failure and will activate a flashing light on the control in different sequences to help pinpoint the failure which has occurred IMPORTANT For your convenience Thermo Products has installed a sight glass in the blower door of this furnace The number of flashes in groups should be observed through this sight glass and recorded before turning off power to the furnace Otherwise power to the furnace will be when turning off power or removing the blower door which is equipped with door interlock switch which will reset the control Should this occur it will be necessary to restart the furnace and have the failure occur again 41 All installations and services must be performed by qualified service personnel DIAGNOSTIC FEATURES The 50V61 control used on this furnace continuously monitors its operation and the operation of the system If the sensed failure is in the system external to the control the red LED will flash in the following flash pause sequences to indicate failure status each flash will last approximately 0 25 seconds and each pause will last approximately 2 seconds 1 flash then pause system lockout retries or recycles exceeded 2 flashes then pause low pressure switch stuck closed 3 flashes then pause low pressure switch stuck open 4 flashes then pause open high temperature limit switch 5 flashes then pause not used 6 flashes then pause 115 V AC power reversed 7 flashes then pause low flame sense signa
14. a gas flame Should acid compounds form in your furnace it may reduce the life of the furnace H CONNECTING THE FURNACE TO ROOF VENT AIR TERMINATIONS The furnace may be vented vertically through the roof if it is not possible to vent the furnaces through the sidewall The outlet inlet of the vent and air intake terminations shall be a minimum of 12 inches above highest anticipated snow level The vent outlet must be installed a minimum of 12 in above the air intake inlet The combustion air intake shall be installed upwind of the vent outlet when exposed to prevailing winds The exhaust vent and combustion air intake can be a minimum of 3 in and a max of 24 in apart see Figure 13 NOTE When the vent termination is installed correctly no draft should be present in the system during the furnace off cycle VENT TERMINATION Figure 13 19 All installations and services must be performed by qualified service personnel I CONDENSATE DRAIN LINE AND TRAP ASSEMBLY 1 The following diagrams show the typical drain and trap connection for a CHX1 and CDX1 furnace 2 AP bo N DRAIN HOS ROM CONDENSING COIL COVER TRAP ASSEMBLY Figure 15 TRAP ASSEMBLY MOUNTED ON CDX1 20 All installations and services must be performed by qualified service personnel C
15. furnace at full high fire input rate under present conditions If necessary consult your gas supplier or qualified heating contractor for recommendations to alleviate the problem 19 Turn off the gas at the manual gas shutoff valve turn handle to the OFF position 20 Remove all pressure gauges and replace all pressure tap plugs 21 Go to Checkout Procedure below Adjusting Burner Input For Altitudes Above 2000 Feet Ratings of gas utilization equipment are based on sea level operation and shall not be changed for operation at elevations up to 2 000 feet 600 m For operation at elevations above 2 000 feet 600 m equipment ratings shall be reduced at the rate of 4 percent for each 1 000 feet 800 m above sea level For additional information refer to the latest edition of the National Fuel Gas Code Checking The Burner Flame CAUTION The furnace model series CDX1 CHX1 are sealed combustion designs that do not require an air shutter adjustment air shutters are not used for proper flame characteristics The burner box access cover must always be secured with all screws in place and tightened before operating furnace Once the input rate has been confirmed correct for a specific application the burner flames should be checked for proper adjustment 37 All installations and services must be performed by qualified service personnel This furnace is designed not to require any burner adjustment Burner aeration is f
16. is combined with the furnace condensate drain line it must have a separate trap ahead of the joint connection 6 is not readily available or is above the trap outlet level on the furnace or the drain line cannot be sloped downward its full length to the drain then a condensate pump part 350225 can be ordered from the factory Follow the pump manufacturers installation instructions 7 The furnace condensate is slightly acidic with a pH of 3 5 Cola drinks with a pH of 3 1 are actually more acidic If local codes require a neutralizing kit the kit may be ordered using part no 320095 Instructions included with the neutralizing kit must be followed for its proper installation 8 The condensate piping in the furnace and the drain system must be flushed out at the start of every heating season This will assure trouble free operation and will keep the acidity level well above 3 4 pH To flush the condensate drain system turn off power to the furnace at the electrical disconnect switch and turn the thermostat to the lowest setting Remove the 11 16 diameter clear tubing from the coil drain nipple and run tap water into the open end of the tubing This should keep the drain system clean Replace the tubing by pushing it firmly onto the nipple Make sure the spring clamp is returned to the original position to prevent leaks If any of the electrical controls are exposed to water dry with a soft cloth and wait 24 hours before opera
17. must be followed 1 The vent air intake terminations outlined by Thermo Products in this manual must be used 2 The entire vent air intake system must be made of PVC Schedule 40 pipe NOTE All CHX1 CDX1 furnaces recommended to be installed with outside combustion air 3 The flue vent pipe and combustion air pipe must be at least as large as the exhaust vent air intake pipe specified by Thermo Products No reduction in size is permissible The CHX1 CDX1 75 requires 2 Schedule 40 PVC pipe The CHX1 CDX1 100 and 125 require 3 Schedule 40 PVC pipe 4 This CHX1 CDX1 furnace shall not be common vented with any other appliance including those burning solid fuels 5 Horizontal runs of exhaust vent pipe shall slope upward at least 1 4 per foot from the outlet of the furnace CHX1 s or the outlet of the drain tee CDX1 s to the vent termination at the outside wall This will permit proper drainage of the condensate Horizontal runs of inlet vent pipe shall slope downward at least 1 4 per foot from the outlet of the last elbow or last horizontal run before exiting the wall to the vent termination at the outside wall 6 The vent pipe must be supported every 4 feet and at every joint to prevent pipe blockage caused by condensate trapped by a sag in the vent 7 The maximum permissible vent length of straight pipe and number of elbows permitted for the exhaust vent and combustion air inlet is shown in Table 2 The elbows shown are in additio
18. obtain an accurate manifold gas pressure reading the main burner must be cycled on and off several times to stabilize the gas control valve pressure regulator diaphragm 15 Allow the burner to operate for at least 3 minutes before taking gas pressure readings 16 Using a pressure gauge measure the burner manifold gas pressure 36 All installations and services must be performed by qualified service personnel 17 If checking the input rate by measuring burner manifold pressure proceed to step 18 If measuring the input rate by clocking the gas meter repeat steps 9 through 11 above 18 If the gas pressure is not within the specified high fire manifold pressure range refer to Table 5 repeat steps 12 a through 12 d above adjusting the high fire gas pressure regulator If the manifold pressure remains low and it cannot be adjusted into the proper range the supply pressure may be too low Follow these steps a Turn off the gas at the manual gas shutoff valve b Remove the automatic gas control valve inlet pressure tap and attach another pressure gauge to the inlet tap c Turn on the gas and repeat steps 14 and 15 above d Adjust the upstream inlet gas pressure to 14 0 in W G or as close as possible e Using a pressure gauge measure and adjust the burner manifold gas pressure If it is still not possible increase the manifold gas pressure to within the required range there is too little gas supply to operate the
19. 143 f Y Y 5 AMP 24 V wa are fa BLOWER CONTROL at 16 HIGH HI AN G I Bl 9 9 31 us A STAG om ma z GAD VALV VA COLL BOX N LOW ee 2 wo c NL Nu N I 2 STAGE HTG wl js C C O aD HGH ROLL OUT AUX LIMIT iEn NA LIMIT USED ON CDX Y GD MODELS ONLY FLAME SENSOR Sew 1c BIA x 9 gt pr 2 PRESSURE SWITCH N O CONNECT HOT TO L1 AND COMMON TO N 9759 TEMPERATURE SWITCH OPEN ON TEMP RISE E 2 IF ANY OF THE ORIGINAL WIRES AS SUPPLIED WITH THE G Ks CHASSIS GROUND FURNACE MUST REPLACED IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF LEAST 105 C N 3 SET HEAT ANTICIPATOR AT 0 4 AMP Bl BLOWER INTERFACE W R 50V61 143 IC INTERGRATED CONTROL W R 50V61 143 53
20. 6 1 49 350704 50 1 39 350139 51 RAMMED 5 1 1 OR MOUNTING BAND 350818 3 3 3 4 j 3 TRANSFORMER 24v 1 HEYCO BUSHING SR34 2 350016 57 GROMMET CRO 7 8 446 ls FILTER RACK KIT 1 1 59 CONCENTRIC KIT 370171 1 370171 1 370171 OPTIO L P CONVERSION K 57419 t AOPS7419 1 61 SIDEWALL VENT KIT 370191 370191 4 P 49 All installations and services must be performed by qualified service personnel 125 2 Replacement parts list for CDX1 75 CDX1 100 and CDX1 JON r A DX1 1 FN N A gt X SSD 20 amp SN SING NOT ANA X V PART gt a az mm lo ZO mE oo ET en lt gt is Be ZO Ox lt mau 21 C oz NC E NN E lt NN 5 gt b E 3 the O 2 LJ ER Loe Cw UE U gm D wz 1 E 2 7 4 50 All installations and services must be performed by qualified service personnel
21. APPED DRAIN FACTORY SHIPPED DRAIN HOSE LOCATION pa DRAIN LOCATION MEN BOTTOM OF COLLECTOR SZ e BOX SIDE CASING GROMMET FOR DRAIN HOSE DRAIN HOSE FROM CONDENSING COIL COVER Figure 16 TRAP ASSEMBLY MOUNTED ON CDX1 RIGHT SIDE HORIZONTAL INSTALLATION 2 Determine on which side of furnace the condensate disposal line is to be run NOTICE On CHX1 CDX1 s this must be the same side as the flue outlet or bottom of unit Attach the condensate trap to the furnace casing using the 8x3 4 sheet metal screws provided in the parts package Pilot holes are provided on both sides of the casing for mounting NOTE When the CDX1 series unit is used in a horizontal application the drain hose from the collector box will require a location change from it s factory shipped connection A knockout has been provided in the unit side casing for the drain hose to exit The connection change can be accomplished as follows Refer to Figure 16 a Locate and disconnect the drain hose at the collector box from its factory shipped connection location b Locate and uncap the drain at the bottom as it is oriented of the collector box C Connect the drain hose from step a to the uncapped bottom drain from step b d Cap the previous drain connection from step a with the existing cap removed in step b 3 Attach the drain hose 11 16 diameter clear tubing
22. D IN ACCORDANCE WITH THERMO PRODUCTS INSTRUCTIONS AND LOCAL CODES IN ABSENCE OF LOCAL CODES FOLLOW THE NATIONAL FUEL GAS CODE ANSI 2223 1 THERMO PRODUCTS LLC 390425 4 4458 P Q BOX 217 NORTH JUDSON IN 46366 1005 WT 4456 14 REMOVE THIS PANEL FIRST IN ORDER TO REMOVE BLOWER DOOR INSTALLATION AND USERS MANUALS ARE LOCATED BEHIND OUTSIDE POWER SOURCE CONNECT 115v 60Hz TO L1 HOT AND L2 COMMON All installations and services must be performed by qualified service personnel This and the previous page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces Please read and comply with the contents of these labels The following safety information should be read understood and followed by the installer ll FOR YOUR SAFETY READ BEFORE OPERATING jll WARNING If you do not follow these instructions exactly a 11 or explosion may result causing property damage personal injury or loss of life A This appliance doas not have a pilot it is equipped with a hot eurface igniter that automatically lights the burner Do not try to light the burner by hand B BEFORE OPERATING smell all aro nd the area for gas Be sure to smell next to the base of unit because some gas is heavier than air and will settle on the floor or ground WHAT TO DO IF YOU
23. DX1 125 BTU HR INPUT High fire Low fire 75 000 56 250 100 000 75 000 125 000 93 750 BTU HR OUTPUT High fire Low fire 69 750 52 312 93 000 69 750 116 250 87 187 HEIGHT OF CASING 46 114 46 114 46 114 WIDTH OF CASING 17 21 24 DEPTH CASING 27 1 2 27 1 2 27 1 2 WARM AIR OUTLET 15 x 18 19 x 18 22 x 18 RETURN AIR INLET 15 x 22 19 x 22 22 x 22 DIA OF FLUE 2 3 3 DIA OF COMBUSTION PP m AIR INTAKE CFM from 2 amp 5 w c EXTERNAL STATIC PRESSURE OPI COOLING COOLING COOLING TAP A 1000 1200 1400 COOLING TAP B 800 1000 1200 COOLING C 1200 1400 1600 COOLING D 1400 1600 2000 HEATING HEATING HEATING HEATING C High fire Low fire 1012 826 1340 1094 1673 1366 TEMPERATURE RISE 65 60 657 60 657 60 BLOWER MOTOR HP 5 75 1 POWER CHOKES 2 65Mh 2 1Mh LARGEST RECOMMEDED AIR CONDITIONER 3 5 Ton s Ten SIZE OF FILTERS 21 3 4 x 14 2 21 34 x 14 2 21 3 4 x 14 2 NOTES 1 BTU output based on annual fuel utilization efficiency rated by manufacturer 2 Onall outlet and inlet dimensions the first dimension is width 3 To permit largest recommended air conditioning at 5 static pressure selection of the highest motor speed is required 4 Electrical characteristics at 115 volts 60 Hz 1 phase less than 15 amps for all models 5 All specifications are subject to change without notice All installations and services
24. ES CDX1 100 125 PARTS PACKAGE 350084381 DESCRIPTION PART QUANTITY 2 3 8 ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 8 x screws for 300283 mounting trap amp inlet outlet collars 11 16 OD x 1 2 ID vinyl tubing 410060 24 2 x 4 electrical J box 350024 1 2 x 4 electrical J box cover 350020 1 8 x 72 TEK screws for mounting 2 x 4 J box eee 2 10 32 x 1 2 green ground screw 300109 1 10 32 hex nut 300110 1 3 16 dia star washer 300270 1 Grounding instructions MG 966 1 Wire nut 300132 2 3 stainless steel hose clamp 300276 2 J box wire bushing 350016 1 Drain hose grommet 350446 1 Spring clamp 11 16 300299 3 Installation notice MG 987 1 PVC tee assembly 2 x 3 dia 320817 1 PVC tee assembly 2 dia 320819 1 Pipe 2 dia PVC 15 14401 1 Bracket 14406 1 Reducer 2 x 3 PVC 320067 1 All installations and services must be performed by qualified service personnel II GENERAL INSTALLATION These Category Type IV furnaces are shipped completely assembled and wired internally See the Dealer Receiving and Freight Claim Procedure Section of the price guide for parts shortage or damage The furnace and duct system must be adjusted to obtain a temperature rise of 55 F to 85 F through the furnace after installation See rating label located on side panel
25. FORMER YES IS THERE 24V ACROSS R AND IS THERE 24 VOLTS ACROSS R AND W1 IS THERE LINE VOLTAGE ACROSS INDUCER POWER TERMINALS IND HI TO IND N OR IND LO TO IND N AT THE 50V61 143 CONTROL CHECK WIRING TO INDUCER AND IF OK REPLACE INDUCER ASSEMBLY 43 CHECK FUSE ON W R 50V61 143 CHECK WIRING TO THERMOSTAT IF OK REPLACE THERMOSTAT REPLACE THE 50V61 143 CONTROL All installations and services must be performed by qualified service personnel CHECK CONTACTS ON LOW FIRE PRESSURE SWITCH a NO gt AND FOR BLOCKAGE IN FLUE REPLACE THE IF OK REPLACE DUAL 50V61 143 CONTROL PRESSURE SWITCH YES VES IS THERE VOLTAGE ACROSS IS THE HIGH LIMIT DOES THE HOT 5 SURFACE IGNITOR No ROLL OUT LIMIT AND SURFACE IGNITOR TERMINALS IGN amp IGN N AUX LIMIT ON ENERGIZE AND GLOW AT THE 50V61 143 CONTROL CDX MODELS AFTER 25 SECOND PREPURGE SWITCHES CLOSED YES NO CHECK WIRING TO HOT IF HIGH LIMIT OR SURFACE IGNITOR AND AUX LIMIT OPEN CHECK IF OK REPLACE HOT FOR RESTRICTED YES SURFACE IGNITOR FILTERS OR DUCT WORK ASSEMBLY IF ROLL OUT SWITCH OPEN INSPECT FLUE FOR RESTRICTIONS CHECK ACROSS MVL AND MV COM TERMINALS ON AFTER HOT SURFACE 50V61 143 CONTROL FOR 24 IGNITOR WARM UP NO VOLTS DURING THE 4 SECOND NO Si ua
26. LOCAL CODES IN ABSENCE OF LOCAL CODES FOLLOW THE NATIONAL FUEL GAS CODE ANSI 2223 1 THERMO PRODUCTS LLC 39042504456 MA P O BOX 217 NORTH JUDSON IN 46366 1002 07 4456 SERIAL DIRECT VENT FORCED AIR FURNACE FOR INDOOR INSTALLATION IN BUILDING CONSTRUCTED ON SITE CONFORMS TO ANS 221 476 CSA 2 3b 2000 CENTRAL FURAN CATEGORY IV TYPE FSP 115V 1PH 60CY TOTAL INPUT AMPS INPUT BTUH HIGH FIRE NAT GAS LOW FIRE NORMAL MANIFOLD PRESSURE HIGH FIRE INCHES W C LOW FIRE MIN GAS SUPPLY PRESSURE FOR INPUT ADJUSTMENT IN W C MAX GAS SUPPLY PRESSURE14 0 INCHES AIR TEMPERATURE RISE HIGH FIRE 55 F TO 85 F LOW FIRE 45 F TO 75 F MAX EXTERNAL STATIC PRESSURE INCHES W C MAXIMUM OUTLET AIR TEMPERATURE F CERTIFIED FOR CLOSET INSTALLATION AT MINIMUM CLEARANCES TO COMBUSTIBLE CONSTRUCTION AS SHOWN TOP FRONT BACK LS RS FLUE PIPE INCHES 1 5 0 0 0 FOR INSTALLATION ON NON COMBUSTIBLE FLOORS ONLY FOR INSTALLATION ON COMBUSTIBLE FLOORING ONLY WHEN INSTALLED ON SPECIAL BASE PART NO 100CA BASE THIS FURNACE REQUIRES A SPECIAL VENTING SYSTEM REFER TO INSTALLATION INSTRUCTIONS NO MG 1010 FOR PARTS LIST AND METHOD OF INSTALLATION MAX VENT LENGTH 35 FEET MIN VENT LENGTH B FEET MIN WALL THICKNESS THROUGH WHICH THE VENT AIR INTAKE PIPES MAY PASS IS 2 INCHES AND THE MAX 15 18 INCHES FILTERS MUST BE INSTALLED EXTERNAL TO THE FURNACE CASING THIS FURNACE MUST BE INSTALLE
27. NING It may be necessary to purge the air out of the gas line for initial start up of the furnace after installation This should be done by a qualified heating contractor If excessive gas escapes when purging the gas supply at the union allow the area to ventilate for at least 15 minutes before attempting to start the furnace LP gas is especially dangerous because the specific gravity of LP gas allows it to accumulate at floor level at a dangerous concentration For remainder of operating instructions reference Users Information Manual A WARNING Heat exchanger oil will burn off on initial firing creating an unpleasant odor To prevent this odor from occurring more than once it is suggested that 1 A window s be opened 2 The thermostat be set at highest setting 3 The furnace remain running at conditions 1 amp 2 for 30 minutes or until odor has dissipated Check for the model number of this furnace its input the type of gas and the manifold pressure on the information plate located on the vestibule panel behind the upper front panel If using the above example the furnace was a CHX1 100 model and the 98 663 BTU input would be acceptable because it was within 2 of the listed high fire input of 100 000 32 All installations and services must be performed by qualified service personnel Measuring And Adjusting Heat Input Rate NCAUTION DO NOT exceed input rating stamped on furnace nameplate or manufacturer s recommended bu
28. ORIFICE 380600 5 380600 4 380600 5 32 PLENUM STRIP 18122 2 13412 4 13412 4 33 BUTTON PLUG 350046 2 350046 2 350046 2 34 FILTER RACK 24803 1 24803 1 24803 1 35 36 BLOWER HOLD DOWN 14325 2 14326 2 14327 2 37 COVER 15923 1 15924 1 15925 1 38 PLENUM STRIP 18123 2 13413 2 39 40 41 SENSOR 350759 1 350759 1 350759 1 42 PRESSURE SWITCH 350860 1 350860 1 350860 1 43 IGNITER 380650 1 380650 1 380650 1 44 HARNESS VESTIBULE 350854 1 350854 1 350854 1 ap HARNESS MENT 350852 1 350852 1 350852 1 46 CONTROL INTEGRATED FAN 350847 1 350847 1 350847 1 47 LIMIT SWITCH 350473 1 350473 1 350473 1 48 PRESSURE SWITCH DUAL 350864 1 350864 1 350861 1 49 HARNESS SUPPLY 350705 1 350705 1 350705 1 50 DOOR INTERLOCK SWITCH 350139 1 350139 1 350139 1 51 52 57424 1 AOPS7425 1 AOPS7426 1 53 MOTOR MOUNTING BAND 350818 3 350818 3 350818 3 54 MOTOR MOUNTING LEG 350819 3 350819 3 350819 3 55 56 57 TRANSFORMER 24v 350464 1 350464 1 350464 1 58 LIMIT BRACKET 14149 1 14149 1 14149 1 59 AUX LIMIT SWITCH 350472 1 350472 1 350472 1 60 SIDEWALL VENT KIT 370191 1 370191 1 370191 1 2 61 CONCENTRIC VENT KIT 370171 1 370171 1 370171 gt OPTIONAL ITEMS NOT SHOWN 62 L P CONVERSION KIT AOPS7419 1 AOPS7419 1 AOPS7419 1 51 All installations and services must be performed by qualified service personnel Appendix B Wiring Diagrams
29. OST PURGE AND OPTIONAL HUMIDIFIER IS DE ENERGIZED THE DELAY TO FAN OFF PERIOD BEGINS 120 SECONDS AFTER THE DELAY TO FAN OFF PERIOD ENDS THE CIRCULATING AIR FAN AND OPTIONAL ELECTRONIC AIR CLEANER ARE DE ENERGIZED 31 All installations and services must be performed by qualified service personnel B INITIAL START UP This furnace does not have a pilot It is equipped with a hot surface igniter which automatically lights the burner Do not attempt to light the burner by hand Check the following items before the initial start up 1 Check all wiring for loose connections and proper hook up 2 Leak test gas piping connections 3 Check all tubing to the pressure switch and drains to make sure they are connected firmly at all their connection points 4 Check flue pipe combustion air inlet and all PVC connections for tightness and to make sure there is no blockage 5 Make sure air filter is in place 6 Make sure the outside vent and air intakes are installed according to instructions and that they are free from blockage 7 Make sure that the drain trap is properly connected to the furnace and to the buildings drain system OPERATING INSTRUCTIONS AWARNING Turn off power to furnace before it is placed into service The gas piping system must have been leak tested by a qualified heating contractor See Section J of these instructions on the installation of gas piping A WAR
30. STARTING THE UNIT A SEQUENCE OF OPERATIONS AT ANY TIME THE CONTINUOUS SAFE OPERATION CHECK GAS VALVE IS IF FLAME SIMULATION CONDITION PRESENT OR ROLL OUT SWITCH NOT ENERGIZED OPENS SYSTEM ENERGIZES INDUCER FAN FOR 15 SECONDS AND CIRCULATOR BLOWER AT HEATING SPEED UNTIL SITUATION CORRECTION THERMOSTAT CALLS FOR HEAT W1 OR W1 amp W2 CONTACTS CLOSE 50V61 143 CONTROL ENERGIZED INDUCER ENERGIZED ON HIGH SPEED LOW FIRE PRESSURE SWITCHES SENSES ADEQUATE DIFFERENTIAL PRESSURE CONTACTS CLOSE PREPURGE IGNITION DELAY INDUCER RUNS FOR 30 SECONDS INDUCER REDUCES TO LOW SPEED LOW PRESSURE SWITCH SENSES ADEQUATE PRESSURE DIFFERENTIAL CONTACTS STAY CLOSED POWER IS APPLIED TO THE WHITE RODGERS 768A SILICON NITRIDE IGNITOR IGNITOR WARM UP IS 20 SECONDS e 29 All installations and services must be performed by qualified service personnel AFTER IGNITOR WARM UP THE 36E54 GAS VALVE IS ENERGIZED TO OPEN ON LOW FIRE SETTING FLAME MUST BE DETECTED IF FLAME IS NOT DETECTED THE WITHIN 4 SECONDS IF IF NOT GAS VALVE IS DE ENERGIZED FLAME IS DETECTED THE THE IGNITOR IS TURNED OFF AND DELAY TO FAN ON TIME THE 50V61 143 CONTROL GOES BEGINS 45 SECONDS INTO RETRY SEQUENCE THE RETRY SEQUENCE PROVIDES A 60 SECOND WAIT BEFORE IGNITION RETRY RETRY IS ATTEMPTED WITH A DIFFERENT VOLTAGE SETTING IF IGNITION ATTEMPT IS IF SO UNSUCCESSFUL
31. TS The vent terminal shall be located at least 3 ft above any forced air inlet located within 10 ft The terminal shall be at least 1 ft below 1 ft horizontally from or 1 foot above any door window or gravity air inlet into any building The bottom of the vent terminal shall be located at least 18 in above grade The terminal shall not be located over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators relief valves or other equipment A minimum horizontal clearance of 4 ft must be maintained from electric meters gas meters regulators and relief equipment The vent terminal shall not be installed over these or any other equipment where condensate or vapor could be detrimental to the operation of this equipment and or controls The unit shall be located so a minimum of 1 4 per foot upward slope can be maintained from the furnace to the terminal outlet and 1 4 per foot downward slope for the last horizontal run of inlet to the outside inlet terminal The vent discharge must be installed a minimum of 12 above grade 14 from any obstruction and three feet from an inside corner of an L shaped structure 11 All installations and services must be performed by qualified service personnel s j v Oo m t HE 224 gH E 3 MIN x
32. Thermo Pride TWO STAGE CONDENSING GAS FURNACE INSTALLATION AND OPERATION MANUAL MODELS FOR USE WITH NATURAL GAS OR LP GAS PROPANE CHX1 75N CDX1 75N CHX1 100N CDX1 100N CHX1 125N CDX1 125N AWARNING iF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS MANUAL A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE PERSONAL INJURY OR LOSS OF LIFE DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE WHAT TO DO IF YOU SMELL GAS DO NOT TRY TO LIGHT ANY APPLIANCE DO NOT TOUCH ANY ELECTRICAL SWITCH DO NOT USE ANY PHONE IN YOUR BUILDING LEAVE THE BUILDING IMMEDIATELY IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR S PHONE FOLLOW THE GAS SUPPLIER S INSTRUCTIONS e IF YOU CANNOT REACH YOUR GAS SUPPLIER CALL THE FIRE DEPARTMENT INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER SERVICE AGENCY OR THE GAS SUPPLIER REFERRED TO IN THESE INSTRUCTIONS AS A QUALIFIED HEATING CONTRACTOR PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION INITIAL FIRING AND BEFORE PERFORMING ANY SERVICE OR MAINTENANCE THESE INSTRUCTIONS MUST BE LEFT WITH THE HOMEOWNER AND SHOULD BE RETAINED FOR FUTURE REFERENCE BY QUALIFIED SERVICE PERSONNEL THERMO PRODUCTS LLC BOX 217 NORTH JUDSON IN 46366 PHONE 574 896 2133 MADE IN USA MG 1010 ECN4470 MA All installations and services must be performed by qualified service personnel I
33. USED ON CHX1 100 125 LENGTH SLEEVE SIDE VENT ONLY NOTE X BLACK COATED SUPPLIED CONNECTION TO METAL INLET CAULKING C BE USED EMENT NOT i O SEAL ALL C EXCEPT AS NOTED CONNECTION CHX1 Figure 6 14 All installations and services must be performed by qualified service personnel COMPONENTS REQUIRED FOR VENT AND AIR INLET CONNECTION A O D PVC VENT INLET PIPE SLOPES DOWNWARD 1 4 PER FOOT FROM BEGINNING OF LAST HORIZONTAL RUN TO OUTDOOR VENT ELBOW PVC VENT PIPE SLOPES UPWARD 1 4 PER FOOT TO OUTDOOR VENT ELBOW P SCHED 40 PVC PIPE SLEEVE AND 2 IN CHED 40 PVC COUPLING CDX1 75 IN SCHED 40 PVC PIPE SLEEVE 100 125 OTE LENGTH IS DEPENDENT ON WHICH SIDE VENT IS ON NOTE DO NOT USE SEALANT AT CONNECTION TO METAL INLET OF BURNER BOX THE SCREW WILL SUFFICE 2 IN SCHED 40 PVC PIPE SUPPLIED W UNIT 2 IN SCHED 40 PVC 90 ELBOW 2 IN SCHED 40 PVC PIPE USED ON CDX1 75 ONLY 3 IN SCHED 40 PVC PIPE USED ON CDX1 100 125 ONLY RADIATOR HOSE AND 2 SPRING CLAMPS SUPPLIED W UNIT DRAIN TEE ASSEMBLY SUPPLIED W UNIT 2 IN USED ON CDX1 75 ONLY IN SHOWN USED ON CDX1 100 125 ONLY 2 2 IN SCHED 40 PVC 90 ELBOW USED ON CDX1 75 ONLY 3 IN SCHED 40 PVC 90 ELBOW USED ON CDX1 100 125 ONLY 2 BURNER IN SCHED 40 PVC
34. VC pipe use silicone type sealant on the 2 dia PVC elbow 2 dia PVC tee for CDX1 horizontal applications before inserting it onto the outlet of the inducer Install a black coated 8x3 4 sheet metal screw through the elbow and on the outlet flange of the inducer to secure the elbow in place TEE INDUCE ASSEMBLY Figure 9 RAP MBL NDUCER HOSE Soi fa N VENT TEE Figure 10 Y T Y ASSEMBLY PV MPS SIDE OF FURNACE CDX1 100 125 SERIES lt 3 DIA yo OF FURNACE Figure 11 TRAP SIDE ASSEMBLY FURNACE SSEMBL CDX1 100 125 SERIES IN A RIGHT HAND HORIZONTAL APPLICATION PVC cement the pre cut 2 dia PVC from step a to the 2 dia PVC elbow 2 dia PVC tee for CDX1 horizontal applications Attach to the drain tee assembly using the radiator hose and the 2 clamps supplied 17 All installations and services must be performed by qualified service personnel NOTICE The exhaust vent piping must slope upward at least 1 4 per foot from the furnace to outdoor vent terminal The inlet vent piping must slope downward at least 1 4 per foot from the beginning of the last horizontal run of pipe to the outdoor vent terminal The PVC pipe must be supported directly over the vent tee assembly CDX1 or CHX1 every four feet thereafter and at every joint After making sure the slope and length of the piping are
35. VOLTS ACROSS MVH AND NO REPLACE THE MV COM ON 50V61 143 CONTROL 50V61 143 CONTROL YES CHECK CONNECTIONS TO GAS VALVE IF OK lt J1 REPLACE GAS VALVE CONFIRM IF EITHER Y BLOWER WHEEL IS RUBBING AGAINST NO DOES BLOWER NO HOUSING OR MOTOR BERI SPIN FREELY 27 SHAFT IS SPINNING FREELY AND REPAIR OR REPLACE AS YES NECESSARY vie REFERENCE ECM OPERATION MANUAL DOES SYSTEM RUN IS LED LIGHT UNTIL THERMOSTAT ON 50V61 143 IS SATISFIED CONTROL FLASHING NO CHECK ALL WIRING FOR LOOSE CONNECTIONS REFERENCE LED CHART ON PG 34 OF THIS MANUAL YES 46 All installations and services must be performed by qualified service personnel DOES BURNER SHUT OFF WHEN THERMOSTAT IS CHECK FOR 24 VOLTS AT GAS VALVE REPLACE GAS VALVE SATISFIED YES CHECK FOR SHORT IN WIRE TO THERMOSTAT AND CORRECT IF NECESSARY Y DOES THE CIRCULATING AIR BLOWER TURN OFF NO REFERENCE ECM AFTER THERMOSTAT IS gt OPERATION MANUAL SATISFIED WITHIN 120 SECONDS YES TROUBLE SHOOTING COMPLETE 47 All installations and services must be performed by qualified service personnel Appendix A Replacement Parts List 1 Replacement parts list for CHX1 75 CHX1 100 and CHX1 125 CHX1 75N amp CHXT T125N REPLACEMENT PARIS
36. aulk to allow for maintenance Note Do not use silicone caulk to seal the PVC sleeve or coupling to the metal air intake collar on the burner box The screw securing the sleeve or coupling to the collar is sufficient 9 1 1 1 the vent termination blocked A mild soap and water solution may be used to check for leaks Vent connections shall be checked for leakage with the furnace induced draft blower running and with 0 Vent pipe passing through an unheated space must be insulated with 1 0 thick foil faced fiberglass insulation or it s equivalent to prevent freezing of any condensate within the pipe 1 Minimum clearance from the PVC pipe to combustible material is zero inches 2 Screens are not required by Thermo Products for the vent and intake However optional stainless Steel screens are available from Thermo Products should the homeowner request them IMPORTANT The CHX1 CDX1 furnace models may be vented either through the sidewall or roof For sidewall instructions continue reading the following section For roof venting refer to Section H of this manual E SIDEWALL VENTING 1 The maximum wall thickness through which the vent and combustion air pipes may pass is 18 and the minimum is 2 The maximum distance from the outer wall to the center of the elbow is 12 See Figure 2 NSID STRUCTURE VENT OUTLET OUTSIDE STRUCTURE Figure 2 10 COUPLIN ERMINA ION UCIURE
37. correct glue the furnace tee and vent terminal connections in place 3 CONNECTING THE COMBUSTION AIR INLET a Install a 2 PVC elbow with sleeve and coupling CHX1 CDX1 75 series or 3 PVC elbow with sleeve CHX1 CDX1 100 125 series on the inlet of the burner box Using a tape measure measure the length of 2 or 3 PVC pipe needed to clear the casing Be sure to allow sufficient length for insertion to the elbow at the burner box and the elbow or coupling on the end Cut the 2 or 3 PVC to the measured length b After preparation of the PVC pipe secure the coupling or sleeve in place using a black coated 8x3 4 sheet metal screw through the PVC into the metal collar of the burner box Note The PVC connection to the metal burner box collar does not require silicone sealant or PVC cement Attach the PVC elbow to the sleeve and then to the coupling where required using silicone type sealant see figure 12 c Install the precut 2 or 3 PVC pipe into the elbow at the burner box and to the elbow or coupler just outside the furnace using silicone type sealant To make these seals run a bead of silicone type sealant around the PVC pipe 3 8 from either end insert into the appropriate couplings and elbows and rotate 1 4 turn This will allow for easy disconnection in case the burner assembly must be removed at a later date see figure 12 Note When applying silicone sealant ensure that no excess sealant is pushed into the vent o
38. d use of the manual gas shut off valve and furnace electrical disconnect switch Instruct user to always shut off gas before shutting off electric power 3 The sequence of operation of the furnace 4 The correct operation and maintenance of the appliance as outlined in the users information manual 40 All installations and services must be performed by qualified service personnel 5 That failure to maintain and operate this furnace in accordance with these instructions could result in hazardous conditions bodily injury property damage and may void the limited warranty on the furnace 6 Review with and encourage the user to read the label reproductions and all warnings and instructions outlined on the front cover and in sections Il and of this manual and in the Users Information Manual 7 Recommend that the user have a qualified heating contractor inspect the furnace at the start of each heating season Inform the user of the frequency of inspection required for reach item in Section of the Users Manual Figure 25 INDUCER GASKET 5 VI TROUBLESHOOTING NOTICE BEFORE TROUBLESHOOTING FAMILIARIZE YOURSELF WITH THE START UP AND CHECKOUT PROCEDURE ALL INSTALLATION AND SERVICES MUST BE PERFORMED BY QUALIFIED HEATING CONTRACTORS To assist you in troubleshooting this furnace it is equipped with an integrated ignition control with diagnostics These diagnostics evaluate what control system has experienced
39. e as needed NOTICE The filter areas in table 3 are the minimum areas required based on the CFM generated by the furnace for standard heating speeds only The following formula can be used to determine the minimum filter area required for cooling if the unit is equipped with cooling This value should then be compared to the value shown in table 3 and the larger of the two should then be used for determining the minimum filter area required for that installation FORMULA tons of cooling x 400 CFM per ton 144 square inches per foot filter area sq inches max air velocity of filter from table 3 for the filter type length x width of filter in inches EXAMPLE If you had a CHX1 100 furnace and 4 tons of cooling and a standard permanent filter 4 tons x 400 CFM x 144 460 square inches for cooling 500 For heating a CHX1 100 needs 394 square inches of filter The filter system must be designed for the larger CFM requirement determined for cooling of 460 square inches A filter would have to be sized so that the area length X width was at least 460 sq in L WIRING All wiring shall be performed by a qualified electrician or service person The wiring must comply with local codes the instructions in this manual and in the absence of codes with the National Electrical Code ANSI NFPA 70 or latest edition 1 The following items are guidelines to complete the wiring portion of the installations 25 All installations and serv
40. e furnace 1 For best performance locate the furnace so that it is centralized with respect to the duct system and as near as possible to a floor drain since condensate drainage must be provided 2 Place the unit so that proper venting can be achieved with a minimum number of elbows in accord with the instructions in this manual 3 The furnace must be located on a level dry surface The furnace must be installed so that the electrical components are protected from water If the area becomes wet or damp at times the furnace should be raised above the floor using a concrete base bricks patio blocks etc NOTICE Ensure furnace is level after installation to ensure proper drainage and operation 4 This furnace must be connected to a drain in accordance with these instructions If it is not practical to connect the unit to a drain a condensate pump must be used and can be ordered as an accessory part number 350225 If an acid neutralizer kit is required by local code or the customer it is available under part number 320095 B1 CDX1 HORIZONTAL APPLICATION The CDX1 75 100 and 125 furnaces may be installed in a horizontal position by placing the furnace on the left or right side as viewed from the front in the upright position For left or right horizontal applications of the CDX1 series units the rollout switch located on the burner box must be moved to the pre punched mounting holes on the side of the burner box Screws are prov
41. e measurements However an aneroid pressure gauge in good working condition capable of reading pressure changes of 0 05 in W G or less that was recently calibrated within the last year is a satisfactory alternate These two 2 devices will be considered as equivalent and interchangeable Either device is referred to below as a pressure gauge NOTICE This 2 stage gas valve has two separate gas pressure regulators Checks and adjustments must be made at both high fire high adjustment and low fire low adjustment 1 Shutoff the gas at the automatic gas control valve turn gas control knob to the OFF position 2 Remove the outlet pressure tap plug from gas burner manifold and connect a pressure gauge Refer to Figure 22 below BURNER BOX COVER Figure 22 Exploded View of CDX CHX Gas Control System 3 Turn on the gas at the automatic gas control valve turn gas control knob to the ON position 4 Adjust the room thermostat so the furnace will operate on low fire only 34 All installations and services must be performed by qualified service personnel 10 11 12 To obtain an accurate manifold gas pressure reading the main burner must be cycled on and off several times to stabilize the gas control valve pressure regulator diaphragm Allow the burner to operate for at least 3 minutes before taking gas pressure readings Using a pressure gauge measure the burner manifold gas pressure If checki
42. eat anticipator setting is 0 4 AMPS for furnace operation only To increase length of cycle increase setting of heat scale to decrease length of cycle decrease setting of heat scale Anticipators for the cooling operation are generally pre set by the thermostat manufacturer and require no adjustment Anticipators for the heating operation are of two types pre set and adjustable Those that are pre set will not have an adjustment scale and are generally marked accordingly 26 All installations and services must be performed by qualified service personnel 4 BLOWER AND CONTROL PANEL WIRING NOTE CDX1 125 SERIES SHOWN OTHER UNITS WILL DIFFER SLIGHTLY AS NOTED OWER TINS N ONIROL a HARNESS T ss MOTOR CONTROLLER IRE H MOTOR EN DIP SWITCHES a lor O on ss ON ch OF REFER TO TABLE ON THE 4 Qut uu OR Figure 21 A WARNING TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring DIP SWITCH 1 HEAT OFF DELAY 27 SW1 SW2 SECS ON ON 60 SEC OFF ON 90 SEC ON OFF 120 SEC OFF OFF 180 SEC 2 STAGE DELAY FOR SINGLE STAGE THERMOSTATS SW3 MINUTES OFF 5 MIN ON 10 MIN Factory Setting
43. ed j p V ROLL OUT 6969 96969 LIMIT W2 WIR G Y 2 STAGE THERMOSTAT 16 BLACK WIRES TO ICM 2 BLOWER MOTOR BLACK BLACK RED WHITE WHITE WHITE WHITE RED BLACK BLACK RED GREEN ai ORANGE 8 lii E Ane a 7 6 aj im x WHITE gt N eS 0 FE IGNITOR o BROWN RED 9 amp 2 BROWN HIGH LIMIT PURPLE Was J GREY E rd p FIRE ROLL OUT Lp reese YELLOW LIMIT e ka RED Nc Z FLAME E SENSOR BLUE WHITE GREY 1 CONNECT HOT TO L1 AND COMMON TO N LEGEND 2 IF ANY OF THE ORIGINAL WIRES AS SUPPLIED WITH THE ZL FIELD WIRING FURNACE MUST BE REPLACED IT MUS REPLACED WITH WIRING FACTORY WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 105 C 77 CHASSIS GROUND 3 SET HEAT ANTICIPATOR 0 4 a EARTH GROUND 52 All installations and services must be performed by qualified service personnel WD 538 An I 4217 WIRING DIAGRAM LADDER Li zv qs N C 75 100 125 0 1 75 100 125 PU UU 202 I I PIN BLOWER CONTROL AAA POWER CHOKE USED gt ON 100 amp 125 77 MODELS ONLY E 25 CM 2 N Ca 50061143 INTERGRATED CONTROL INDUCER Li IND 1 TM S d IC AAA 5 a iN IGN IGN NITRIDE IGNITER D V uw pP s A J 50V61
44. from the front CHX1 or bottom CDX1 of the condensing coil cover plate to one side of the PVC tee provided in the trap assembly Secure the drain hose 11 16 o d tubing with the silver clamp provided in the parts package Be careful to route the tubing through the proper hole in the furnace casing using the Heyco bushing provided While making all connections with the clear tubing be careful to route the tubing in a manner to prevent kinking or abrasion of the tubing 21 All installations and services must be performed by qualified service personnel 4 Measure the drain hose 11 16 o d clear tubing provided and remove any extra length making sure that the hose has sufficient length not to kink or otherwise be restricted once installed Attach the drain hose 11 16 o d clear tubing to the other side of the condensate trap tee On CHX1 CDX1 s this hose is shipped in the parts package and it will be necessary to attach the other end to the PVC drain tee assembly see Figure 15 Use the silver clamp s provided in the parts package to secure all connections 5 Install field supplied 1 2 CPVC drain pipe and elbows using CPVC cement to reach a nearby drain A minimum 1 4 per foot downward slope toward the drain must be maintained The drain line must be water tight supported and secured so that it can t be moved The length of the drain must be kept as short as possible IMPORTANT If an air conditioning condensate drain line
45. ices must be performed by qualified service personnel a separate power supply circuit with over current protection and a disconnect switch must be provided The minimum fuse or circuit breaker size is 20 amp b AllCHX1 and CDX1 Series furnaces are supplied with a fuse disconnect switch box to be mounted on the outside surface of the right or left side casing so a fuse disconnect can be mounted on the furnace Make the 115 volt supply connection in this junction box A green screw and a strain relief are provided in order to connect the power supply ground wire and provide strain relief for the 115 volt power leads from the furnace in the fuse disconnect box A disconnect switch can be field mounted on the 2x4 box provided If not the disconnect switch must be located reasonably close to and within sight of the furnace NOTICE The hot surface igniter and operation of this furnace depends on correct polarity The hot leg of the supply circuit must be connected to the black line lead and the common leg to the white line lead in the field mounted junction box The hot leg must pass through the disconnect switch in all cases to prevent the hazard of electrical shock when servicing IMPORTANT The furnace must be grounded in accordance with local codes and with the National Electrical Code ANSI NFPA NO 70 or latest edition when an external electrical source is utilized 2 ELECTRONIC AIR CLEANER EAC AND HUMIDIFIER INSTALLATION The ignition
46. ided in pre punched holes at the required limit location Remove these screws and use them to mount the limit to new location Utilize previously removed limit mounting screws to fill voided holes at previous limit location See Figure 1 For a right side horizontal application of the CDX1 series units the hose from the single tap pressure switch top switch is already connected correctly See Figure 1 For a left side horizontal application of the CDX1 series units the hose from the single tap pressure switch bottom switch must be moved to the lower front tap on the face of the collector box Use the black cap removed from this tap to plug the original pressure switch tap NOTE The hose when moved must be shortened cut to ensure that no excess hose exists to cause a sag loop or water trap For a right side horizontal application of the CDX1 series units the auxiliary limit switch located on the right side of the house air blower must be moved to the bracket on the opposite left side of the blower See Figure 1 All installations and services must be performed by qualified service personnel NOTE When the CDX1 is installed as horizontal unit it is imperative that the auxiliary limit switch and bracket be located on the upper side of the house air blower the burner rollout switch located on the burner box be relocated to the side of the burner box and that the hose from the single tap pressure switch be connected to the lowe
47. inside the furnace vestibule The installation must conform with local codes or in the absence of local codes with the National Fuel Gas Codes ANSI Z223 1 or latest edition and with these instructions AWARNING This furnace is not to be used for temporary heating of buildings or structures under construction Many of the chemicals used during construction when burned form acid bearing condensate that can substantially reduce the life of the heat exchanger A CODES AND CLEARANCES The following items must be considered when choosing the size and location of the furnace 1 All local codes and or regulations take precedence over the instructions in this manual and should be followed accordingly In the absence of local codes installation must conform with these instructions regulations of the National Fire Protection Association provisions of National Electrical Code or latest edition and the National Fuel Gas Code ANSI 7223 1 or latest edition 2 The BTU output capacity of the furnace proposed for installation should be based on a heat loss calculation made according to the manuals provided by the Air Conditioning Contractors of America ACCA or ASHRAE 3 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS TABLE 1 FROM SIDES OF TOPOF FROMTHE SIDEOF MODEL NO FURNACE REAR FFONT plenum FLUE OR VENT PLENUM CHX1 75 CHX1 100 The CHX1 75 100 and 125 furnaces may be installed on combustible flo
48. ixed in this design Burner flames can be seen by looking through the sight glass located on the burner box Burner flames should be well defined light to medium blue in color and almost transparent refer to Figure 24 BURNER MANIFOLD Figure 24 Sketch of Typical Main Burner Flames During Operation NOTICE When operating on propane gas it is not unusual for flames to have yellow or orange colored tips If combustion problems are evident it may indicate problems with either the furnace air supply or the vent system Refer to the installation and maintenance sections of this manual or contact Thermo Products at 574 896 2133 Checkout Procedure 1 Confirm the furnace exhaust vent and combustion air intake are constructed as outlined in the installation and service manual They must not be blocked or otherwise obstructed 2 Place system in operation and observe at least one 1 complete cycle to ensure all controls are operating properly The main burner must light reliably under all conditions 3 Perform gas leakage test on all gas pipe connections and pressure tap plugs 38 All installations and services must be performed by qualified service personnel TIME sec FLOW cfh TABLE 6 CONVERTING GAS FLOW RATE 40 90 41 88 For one cubic foot per revolution gas meter dials 42 86 use Table directly 44 82 45 80 For 1 2 cubic foot per revolution gas meter dials 46 78 1 Determine time for two dial revoluti
49. l 8 flashes then pause check igniter or improper ground 9 flashes then pause high pressure switch stuck open Continuous flash flame sensed with gas valve de energized The LED will also flash once at power up A green LED indicator is also present to obtain an estimate of the air flowrate in CFM produced by the house air blower This LED cycles regularly by providing a constant light followed by a sequence of flashes Each flash can be translated to programmed CFM by using the following 1 flash per 100 programmed A WARNING Power must be disconnected before servicing 42 All installations and services must be performed by qualified service personnel TROUBLESHOOTING GUIDE THE SYSTEM IS STARTED BY SETTING THE THERMOSTAT TO CALL FOR HEAT THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF MALFUNCTION OR DEVIATION FROM THE NORMAL OPERATION NOTE IF LED LIGHT IS FLASHING REFER TO PAGE 34 FOR A QUICK TROUBLESHOOTING GUIDE TO USE THIS DIAGRAM YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES SET THERMOSTAT TO CALL FOR HEAT MAKE CERTAIN ROOM TEMPERATURE IS BELOW THERMOSTAT SETTING IS THERE 120 VOLTS man CHECK INPUT POWER IS THE INDUCER Gee ae NO DOOR INTERLOCK BLOWER OPERATING 5061 143 CONTROL SERVICE SWITCH AND FUSES MODULE IS THERE 24 VOLTS ACROSS TH amp TR AT THE INTEGRATED CONTROL MODEL 50V61 143 NO CHECK 115 VOLT CONNECTIONS IF OK REPLACE TRANS
50. mbustion air vents must be performed by a qualified installer or service person in accord with local codes the National Fuel Gas Code NFPA 54 ANSI Z223 1 or latest edition and the sections on venting in this manual 1 Observing all clearances specified in this manual cut two 2 3 8 diameter holes in the outside wall for CHX1 CDX1 75 and two 3 1 2 diameter holes for the CHX1 CDX1 100 and 125 2 Cuttwo 2 diameter PVC pipes 1 1 2 longer than the depth of the wall This allows for 3 4 connection on both ends of the pipe For 3 PVC pipe leave 3 for connection Using PVC pipe cement cement a PVC elbow or coupler to one end of each pipe Mark the pipe before inserting into the wall so the elbow orientation can be determined Also if a protective shield will be used on the exterior surface of the wall it should be installed at this time Glue a coupling or elbow to each pipe depending on your installation with the PVC pipe cement being careful to maintain the proper orientation of the elbows Complete the assembly of the outlet and inlet as shown in Figure 5 making sure that the spacing between the inlet and outlet complies with that shown in Figure 3 TYPICAL INSTALLATION USING FLUSH AGAINS HE EXTERIOR W Figure 5 3 Finish the vent installation by caulking around the two holes where the PVC pipes pass through the wall 4 An optional vent or intake terminal stainless steel screen is available under part n
51. module on this furnace has designated terminals to control the operation of an electronic air cleaner and or humidifier These terminals provide line voltage 110 20VAC for the control of these accessories See Figure 21 NOTICE It is important to confirm that the operating voltage of the humidifier or EAC being installed matches the output of this control If not a field supplied relay or transformer may be necessary to provide the proper control and supply voltage for the accessory being installed See the manufacturers instructions for the humidifier or EAC for additional instructions 3 THERMOSTAT CONNECTIONS AND ANTICIPATOR SETTING NOTICE For two stage thermostat wire connectors see wire diagram page 44 For single stage thermostat with two stage operation connect W from thermostat to W1 on control W2 on control board is not used Thermostat shunt on control board Fig 21 will need to be moved to single t stat In this configuration the furnace will light and burn on low fire for 10 minutes 5 minutes optional If thermostat has not been satisfied in 10 minutes the control will step up to high fire until thermostat is satisfied If the 5 minutes option is desired turn dip switch 1 3 Fig 21 off Proper control of the indoor temperature can only be achieved if the thermostat is calibrated to the heating and or cooling cycle A vital consideration of this calibration is related to the thermostat heat anticipator The proper thermostat h
52. must be performed by qualified service personnel INSTALLATION PARTS PACKAGES CHX1 75 PARTS PACKAGE 50054378 DESCRIPTION PART QUANTITY 2 3 8 ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 8 x screws for 300283 4 mounting trap amp inlet outlet collars 11 16 OD x 1 2 ID vinyl tubing 410060 24 2 x 4 electrical J box 350024 1 2 x 4 electrical J box cover 350020 1 8 x 72 TEK screws for mounting 2 x 4 J box 00208 10 32 x 1 2 green ground screw 300109 1 10 32 hex nut 300110 1 3 16 dia star washer 300270 1 Grounding instructions MG 966 1 Wire nut 300132 2 3 stainless steel hose clamp 300276 2 J box wire bushing 350016 1 Drain hose grommet 350446 1 Spring clamp 11 16 300299 3 Installation notice MG 987 1 PVC tee assembly 2 dia 320818 1 INSTALLATION PARTS CHX1 100 125 PARTS PACKAGE S00S4379 DESCRIPTION PART QUANTITY 2 3 8 ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 8 x screws for 300283 4 mounting trap amp inlet outlet collars 11 16 OD x 72 ID vinyl tubing 410060 24 2 x 4 electrical J box 350024 1 2 x 4 electrical J box cover 350020 1 8 x TEK screws for mounting 2 x 4 J box 2 10 32 x green g
53. n to the length of straight pipe permitted When counting elbows all elbows used in the exhaust vent or combustion air intake must be counted This includes elbows used inside the furnace jacket and termination elbows In addition up to three elbows may be dropped and the vent length extended five feet for each elbow dropped MAXIMUM VENT LENGTH TABLE 2 VENTSIZE 2 IN PVC 3 IN PVC es 3INPC FURNACE VENT EXHAUST COMBUSTION VENT EXHAUST COMBUSTION MODEL LENGTH VENT AIR INTAKE LENGTH VENT AIR INTAKE FT ELBOWS NO NO ELBOWS NO FT ELBOWS NO ELBOWS NO e ee 7 CHX1 CDX1 75 CHX1 CDX1 100 RERNITT PERMITTED CHX1 CDX1 125 NOT PERMITTED All installations and services must be performed by qualified service personnel NOTES The drain tee supplied with CHX1 CDX1 furnaces count as 1 elbow 2 45 elbows can be substituted for 1 90 elbow Care should be taken to plan out the vent system to be as short as possible but not shorter than 8 ft and to contain as few elbows as possible to insure the best possible operation of the furnace 8 A hack saw may be used to cut the PVC pipe It must be cut smoothly at right angles with all burrs removed All joints must use standard PVC Schedule 40 elbows and couplings Joints are not to be made by gluing and butting together the cut or raw edges of the vent pipe The joints inside the vestibule should be sealed with a silicone c
54. ng the input rate by measuring burner manifold pressure skip to step 12 If measuring the input rate using a gas meter proceed to step 9 Using a clock or watch capable of measuring time in seconds carefully clock the gas meter to determine the time for one 1 complete revolution of the gas meter dial or reel At least one 1 cubic foot of gas flow should be measured Use Table 6 to determine the main burner gas flow rate in cubic feet per hour CFH NOTICE Some gas meters will require more than one 1 cubic foot of gas pass through the meter for reasons of accuracy When more than one 1 cubic foot of gas is consumed divide the total time by the number of cubic feet for comparison to the figures in Table 6 Compare actual heat input rate with our recommended input printed on the furnace rating label To convert the rating label input rate given in BTUH to the equivalent gas flowrate in CFH use the following formula Heat input rate in BTUH Fuel gas higher heating value z x Fuel gas flowrate in CFH 3 t or Heat input rate in BTUH Fuel gas flowrate in CFH eat input rate in Fuel gas higher heating value 24 t If the measured input rate is above or below the rating label value by more than 2 adjust the manifold gas pressure using the gas control valve pressure regulator to obtain the input rating within a 2 range Refer to steps 12 a through 12 d If the gas pressure is not
55. o 320226 Optional Terminations Two optional vent kits are available for vent terminations on horizontal vent applications The concentric vent kit part no 370171 allows for the vent and intake to be installed through one 4 5 inch diameter hole The side wall vent cap part no 370191 is a cover to be installed over the vent and intake pipe as they exit the exterior of the building These optional kits shall be installed according to the instructions provided with each kit The locations and clearances are identical to the requirements of the standard vent terminations described in this manual These vent kits may be used on any size of the CHX1 CDX1 furnace series 13 All installations and services must be performed by qualified service personnel ABUSTION AIR O FURNACE A N x UR NSTALLED FURNAC INCH MIN G CONNECTING FURNACE TO THE VENT AIR INTAKE TERMINATION AND DRAIN 1 The following diagrams show the typical vent and air inlet connection for a CHX1 and CDX1 furnace as well as a list of the parts that will be needed to install each S RD 1 4 PER JRIZONTAL RUN N VC PIPE USED ON C PIPE USED ON RADIATOR 2 SPRING CLAMPS SUPPLIED Lo eem G DRAIN J 90 ELB RIGHT lt N VENT DETAIL CHX1 100 125 ONLY K
56. on and ventilation air supply Such chemicals include but are not limited to chlorinated and or fluorinated hydrocarbons such as found in refrigerants aerosol propellants dry cleaning fluids degreasers and removers Other harmful compounds may come from bleaches air fresheners or mastics Vapors from such products can form acid compounds when burned in a gas flame The life of the furnace could be reduced should acid compounds form within your furnace NOTICE Heat exchanger failure caused from contaminated air will void its limited lifetime warranty NOTICE The vent termination and air inlet elbow shall be checked periodically at least at the start of each heating season for restriction or blockage from foreign material in the vent pipe or in the air inlet The air inlet and vent pipe should be cleaned when necessary E1 SINGLE PIPE SIDEWALL VENTING OPTION This furnace may be horizontally vented with a single exhaust pipe This will be a non direct vent installation The same exhaust venting guidelines apply except the exhaust termination will be similar to the air intake of the 2 pipe direct vent installation Refer to intake terminal instructions Figure 3 and Figure 5 Termination will consist of one 90 elbow pointed downward See figure 2 12 All installations and services must be performed by qualified service personnel F INSTALLATION OF OUTSIDE VENT AIR INTAKE TERMINATIONS NOTICE Installation of the outside exhaust and co
57. ons 47 77 2 Use Table directly 48 75 49 73 For two cubic foot revolution gas meter dials 50 72 1 Determine time for one complete dial revolutions 51 71 2 Divide time by two 52 69 3 Use Table directly 53 68 54 67 55 65 56 64 57 63 58 62 59 61 60 60 62 58 64 56 66 54 68 53 70 51 72 50 74 49 76 47 78 46 80 45 84 43 88 41 92 39 96 38 100 36 105 34 110 33 115 31 120 30 125 29 130 28 135 27 140 26 150 24 160 23 170 21 180 20 39 All installations and services must be performed by qualified service personnel C FURNACE CHECKOUT PROCEDURE Before any system of gas piping is finally put into service it shall be carefully tested to assure that it is gas tight as indicated in the manual NOTICE All controls on the unit should be checked for proper functioning prior to the qualified service personnel leaving the job site Specifically the following should be checked With furnace in normal heating operation check to make certain blower will start and stop automatically under control of integrated fan control 1 Check safety limit control as follows a Shutoffincoming power b Disconnect blower motor leads c Restore power to furnace d Setthermostat above room temperature calling for heat e When temperatures are reached in furnace at limit control setting with blower out of operation burner should shut off f Shut off electrical power IMPORTANT Remove blockage or reconnect blower mot
58. or and restore power 2 Make certain thermostat will automatically start and stop furnace 3 Block the flue pipe gradually with a flat piece of metal until the pressure switch functions shutting off the main burners Note If the burner was initially operating in high fire the burner will first reduce rate to the low fire setting the flue becomes more blocked the pressure switch will function and completely shut off the main burners 4 Block the PVC pipe inlet gradually with a flat piece of metal until pressure switch functions shutting off the main burners Note If the burner was initially operating in high fire the burner will first reduce rate to the low fire setting As the flue becomes more blocked the pressure switch will function and completely shut off the main burners IMPORTANT Remove flue air inlet blockage when done 5 Remove the blower compartment access door with the furnace operating The door interrupt switch is in the 120 volt circuit and will shut down the entire system Replace the blower door and the furnace start up cycle will begin V INSTALLER S INSTRUCTIONS TO USER After completing the installation the installer shall inform and or demonstrate to the homeowner 1 The location of all the instructions in the furnace and that these instructions and the users information manual must be kept along with instructions for any accessories in the plastic pouch on the inside of the furnace 2 The location an
59. oring The furnace shall not be installed directly on carpeting tile or other combustible material other than wood flooring The CDX1 75 100 and 125 furnaces are to be installed on non combustible flooring only The non combustible floor bases model no 50 CA base for CDX1 75 model no 100 CA base for the model no CDX1 100 and model no 125 CA base for CDX1 125 are available for the counterflow furnaces to allow their installations on combustible flooring These furnaces may be installed in an alcove or in a closet if the minimum clearances to combustible construction listed previously are met The CDX1 series furnaces may be installed in an attic or crawl space Refer to section B1 of this installation manual The minimum clearances are listed for fire protection Clearance for servicing the front of the furnaces and to all points on the furnace requiring access must be 24 For horizontal furnace installation refer to section B1 of this installation manual All installations and services must be performed by qualified service personnel Equipment must be installed in accordance with regulations of the National Board of Fire Underwriters Authorities having jurisdiction should be consulted before installations are made B FURNACE LOCATION A CAUTION These high efficiency condensing furnaces are not certified for and shall not be vented into a standard or any type of chimney The following shall be considered for locating th
60. ow fire 70 875 49 612 94 500 66 150 117 500 82 250 HEIGHT OF CASING 44 114 44 114 44 114 WIDTH OF CASING 17 21 24 DEPTH OF CASING 27 1 2 27 1 2 27 1 2 WARM AIR OUTLET 15x 18 19x 18 22x18 RETURN AIR INLET 25 x 16 25 x 16 25x16 DIA OF FLUE 2 3 3 DIA OF COMBUSTION 2 3 3 AIR INTAKE CFM from 2 amp 5 w c EXTERNAL STATIC PRESSURE POOLING COOLING COOLING COOLING TAP A 1000 1200 1400 COOLING TAP B 800 1000 1200 COOLING TAP C 1200 1400 1600 COOLING TAP D 1400 1600 2000 HEATING HEATING HEATING HEATING TAP A High fire Low fire 931 760 1243 1015 1556 1270 TEMPERATURE RISE 70 60 70 60 70 60 BLOWER MOTOR 5 15 1 POWER CHOKES 2 65 Mh 2 1 Mh LARGEST RECOMMEDED AIR CONDITIONER 3 5 Ton 4 Ton 5 Ton SIZE OF FILTERS 24 3 4 x 15 3 4 24 3 4 x 15 3 4 24 3 4 x 19 3 4 NOTES 1 BTU output based on annual fuel utilization efficiency rated by manufacturer 2 On all outlet and inlet dimensions the first dimension is width 3 To permit largest recommended air conditioning at 5 static pressure selection of the highest motor Speed is required All installations and services must be performed by qualified service personnel CDX1 SERIES MODEL NO CDX1 75 CDX1 100 C
61. ped with a hot surface igniter that automatically lights the burner Do not try to light the burner by hand 5 Turn gas control knob clockwise to OFF position gas valves with a switch move the switch to the OFF position 8 Wait five 5 minutes to clear out any gas Then smell for gas including near thefloor or ground if you smeli gas STOP Follow in the safety information above on this label H you don t smell gas go to next step HEATING ED NSTALLER S D Do not use this appliance if any part has been under water immediately call a qualified service technician to Z 1 gt inspect the appliance and to replace any part of tha control system any gas control which has been underwater Paral a 2 E Y lt RE OPERATING INSTRUCTIONS O S5 r c 1 STOP Read the safety information above on this iabel 2 a 2 Set the thermostat the lowest setting o 2 SPECIAL HOMEOWNERS IMPROPER INSTALLATION ADJUSTMENT ALTERATION SERVICE OR MAINTENANCE CAN CAUSE 7 Turn gas control knob counterclockwise to ON position For gas vaives with a switch move the switch ta the ON position 8 Turn on all electric power to unit 9 Sat thermostat to desired setting and if equipped set the operating mode to HEAT 10 if appliance will not operate follow the instructions To Turn Ott Gas To Appliance and cali your ser
62. pening This may cause flow restriction within the vent 1 CDX1 75 INLET COLLAR DO NOT SILICONE OR SEAL BURNER BOX THIS CONNECTION IN ANYWAY MUST BE LOOSE FIT WITH LEAKAGE BETWEEN PVC AND METAL COLLAR Figure 12 NOTICE The air intake pipe must be supported every 4 feet After making sure the length of the piping is correct glue all connections in place except the length of pipe between the combustion air fitting on the burner box and the first fitting If the combustion air piping is installed in a warm humid place such as a laundry room or above a suspended ceiling it must be insulated with a 1 0 foil faced insulation or its equivalent If the vent piping is run through an unconditioned space it must be insulated with a1 0 foil faced insulation or its equivalent 18 All installations and services must be performed by qualified service personnel A CAUTION Outside combustion air must not come from an area that is directly adjacent to pool hot tub or spa Measures should be taken to prevent the entry of corrosive chemicals or vapors to the combustion and ventilation air supply Such chemicals include but are not limited to chlorinated and or fluorinated hydrocarbons such as found refrigerants aerosol propellants dry cleaning fluids degreasers and removers Other harmful compounds may come from bleaches air fresheners or mastics Vapors from such products can form acid compounds when burned in
63. pplied with a high quality re usable filter rated for air velocities up to 600 ft min An optional Thermo Products filter rack assembly part no AOPS7547 for CHX1 75 thru 100 and AOPS7375 for CHX1 125 is available which is sized for the filter provided If an optional Thermo Pride filter rack AOPS7547 figure 19 is used with the furnace it will serve as a template to scribe a mark for the return air opening on the casing Place the filter rack on the casing one inch up from the bottom of the furnace and centered from side to side Place the securing flange against the casing for locating the return air opening SECURING FLANG Cuy 195 CHK 22 OPEN END INTO WHICH FILTER SLIDES Figure 19 PLEASE NOTE While scribing the return air opening the filter rack can be held into position by tape or similar means Position the open end of the filter rack so that it is accessible for filter replacement Once the filter rack is positioned correctly scribe a line along the inside of the securing flange of the filter rack on three of the sides To scribe a line on the fourth side on the open end use the open end support for a guide Remove the filter rack and cut the return air opening in the casing Now the filter rack can be permanently attached to the furnace with screws or pop rivets along the securing flange Connect the return plenum to the filter rack and slide the filter into place 2 CDX1 MODELS COUNTERFLOWS Thi
64. r for a gas detector AWARNING Turn off power to furnace before it is placed into service The gas piping system must have been leak tested by a qualified heating contractor AWARNING It may be necessary to purge the air out of the gas line for initial start up of the furnace after installation This should be done by a qualified heating contractor If excessive gas escapes when purging the gas supply at the union allow the area to ventilate for at least 15 minutes before attempting to start the furnace LP gas is especially dangerous because the specific gravity of LP gas allows it to accumulate at floor level at a dangerous concentration For remainder of operating instructions reference Users Information Manual A WARNING Heat exchanger oil will burn off on initial firing creating an unpleasant odor To prevent this odor from occurring more than once it is suggested that 1 Awindow s be opened 2 The thermostat set at highest setting 3 Thefurnace remain running at conditions 1 amp 2 for 30 minutes or until odor has dissipated A CAUTION The CHX1 CDX1 furnace models are sealed combustion design which does not require an air shutter adjustment air shutters are not used for proper flame characteristics Burner box access cover must always be secured with all screws in place and tightened before operating furnace All installations and services must be performed by qualified service personnel AWARNING Personal injury or prope
65. r tap on the front of the collector box See Figure 1 L UTILIZE F SIDE HOR APPLICATION P RESSURE SWITC COLLECTOR BOX PRESSURE SWITCH DUAI The horizontal furnace installation should be on a service platform large enough to allow for proper clearances on all sides and service access to the front of the furnace See Table 1 If the furnace is suspended it must be supported at both ends and in the middle with clearance allowed for removal of both access doors Gas supply line contact is only permissible between lines formed by the intersection of the top and two sides of the furnaces casing and the building joists studs or framing See Figure 1 All installations and services must be performed by qualified service personnel Equipment must be installed in accordance with regulations of the National Board of Fire Underwriters and the National Fuel Gas Code Authorities having jurisdiction should be consulted before installations are made C REPLACING AN EXISTING FURNACE FROM A COMMON VENT A WARNING These furnaces may not be common vented with any other appliance D GENERAL REQUIREMENTS FOR VENTING CHX1 CDX1 The CHX1 CDX1 furnace venting system must be installed by a qualified service person in accordance with local codes the National Fuel Gas Code NFPA 54 ANSI Z223 1 or latest edition and these instructions The following items and local code requirements
66. rner manifold pressure for orifice size used Observe the following precautions when measuring A Burner manifold pressure with a pressure gauge 1 Close the gas valve turn the gas control knob to the OFF position BEFORE removing the a burner manifold pressure tap plug to connect the manometer or calibrated pressure gauge b manometer or gauge and replacing the pressure tap plug Shut off the gas supply at the appliance service manual gas shutoff valve or for LP gases shut off the gas at the storage tank service valve BEFORE removing the a gas valve inlet pressure tap plug b manometer or gauge and replacing the inlet pressure tap plug Perform a gas leakage test at the gas valve inlet and burner manifold pressure tap plugs B Gas flowrate by clocking gas meter 1 To determine the amount of flow through the gas meter due to the operation of the furnace a Turn off all other appliances and extinguish their pilot flames if equipped or b Deduct the gas consumption of all other operating appliances from the total meter reading Convert the gas flowrate to the heat input rate in BTUH as described in step 10 in the following section and compare the value to the heat input rating on the furnace nameplate 33 All installations and services must be performed by qualified service personnel NOTICE A U tube manometer measuring pressure in inches of water column is recommended for all gas pressur
67. round screw 300109 1 10 32 hex nut 300110 1 3 16 dia star washer 300270 1 Grounding instructions MG 966 1 Wire nut 300132 2 3 stainless steel hose clamp 300276 2 J box wire bushing 350016 1 Drain hose grommet 350446 1 Spring clamp 11 16 300299 3 Installation notice MG 987 1 PVC tee assembly 2 x 3 dia 320817 1 All installations and services must be performed by qualified service personnel INSTALLATION PARTS PACKAGES CDX1 75 PARTS PACKAGE 50054380 DESCRIPTION PART QUANTITY 2 3 8 ID radiator hose 410017 1 Thermostat lead bushing 350750 1 PVC trap assembly 320816 1 8 x screws for 300283 mounting trap amp inlet outlet collars 11 16 OD x 72 ID vinyl tubing 410060 24 2 x 4 electrical J box 350024 1 2 x 4 electrical J box cover 350020 1 8 x 2 TEK screws for mounting 2 x 4 J box eee 2 10 32 x 1 2 green ground screw 300109 1 10 32 hex nut 300110 1 3 16 dia star washer 300270 1 Grounding instructions MG 966 1 Wire nut 300132 2 3 stainless steel hose clamp 300276 2 J box wire bushing 350016 1 Drain hose grommet 350446 1 Spring clamp 11 16 300299 3 Installation notice MG 987 1 PVC tee assembly 2 dia 320819 1 Pipe 2 dia PVC 15 14401 1 Bracket 14406 1 All installations and services must be performed by qualified service personnel INSTALLATION PARTS PACKAG
68. rty damage could result from repair or service of this furnace by anyone other than a qualified heating contractor Only the homeowner user routine maintenance described in the Users Information Manual may be performed by the user All installations and services must be performed by qualified service personnel INDEX SECTION BEGINNING PAGE l SAFETY INFORMATION i I FURNACE SPECIFICATIONS 1 I GENERAL INSTALLATION 6 A CODES AND CLEARANCES 6 B FURNACE LOCATION 7 B1 CDX1 HORIZONTAL APPLICATION 7 C REPLACING EXISTING FURNACE FROM A COMMON VENT 9 D GENERAL REQUIREMENTS FOR VENTING CHX1 CDX1 9 E SIDEWALL VENTING 10 E1 SINGLE PIPE SIDEWALL VENTING OPTION 12 F INSTALLATION OF OUTSIDE VENT AIR INTAKE TERMS 13 G CONNECTING FURNACE TO VENT AIR INTAKE TERMS 14 H CONNECTING FURNACE TO ROOF VENT AIR TERMS 19 I CONDENSATE DRAIN LINE amp TRAP ASSY 20 J GENERAL GAS PIPING 22 K FILTERS 23 L WIRING 25 IV STARTING THE UNIT 29 A SEQUENCE OF OPERATIONS 29 B INITIAL START UP 32 C FURNACE CHECKOUT PROCEDURE 40 V INSTALLER S INSTRUCTIONS TO USER 40 VI TROUBLESHOOTING 41 APPENDIX A REPLACEMENT PARTS LIST 48 APPENDIX B WIRING DIAGRAMS 52 All installations and services must be performed by qualified service personnel Il FURNACE SPECIFICATIONS CHX1 SERIES MODEL NO CHX1 75 CHX1 100 CHX1 125 BTU HR INPUT High fire Low fire 75 000 52 000 100 000 70 000 125 000 87 500 BTU HR OUTPUT High fire L
69. s CDX1 furnace has been factory supplied with two high quality reusable filters rated at 600 ft min These filters are designed to be mounted on the return air plenum opening on the top of the furnace in the double vee style rack provided see Figure 20 If feasible it is recommended that slits be cut in the return front to allow for easier access of the filters 1 FILTERS CDX1 SERIES CDX1 SERIES COUNTERFLOW APPLICATION RIGHT SIDE HORIZONTAL APPLICATION Figure 20 24 All installations and services must be performed by qualified service personnel 3 USE OF NON THERMO PRIDE FILTER RETENTION MEANS If a method other than the Thermo Pride filter rack is selected for retention of the filter and or use of a different filter type is desired see Table 3 for minimum size guidelines for selecting a filter system for the CHX1 or CDX1 furnaces MINIMUM FILTER AREA REQUIRED LENGTH X WIDTH SQ IN TABLE 3 FILTER TYPE MAXIMUM Required Filter Velocity Rating x 144 min filter RATE in2 AIR VELOCITY FURNACE MODEL D p CHX1CDX1 75 CHX1 CDX1 100 CHX1 CDX1 125 THERMO 600 FT MIN 254 IN 328 IN 402 IN PRODUCTS SUPPLIED PERMANENT FILTER PERMANENT FILTER FILTER The Thermo Products supplied filter can be cut to size to fit other filter retention systems as long as the minimum size requirement is met NOTICE Any internal stiffeners used in the filter must not be removed although they can be cut to siz
70. ting the furnace Set the room thermostat to the desired temperature and restore electrical power to the furnace J GENERAL GAS PIPING AWARNING Because of the potential of odorant fade a gas leak may not be detected by smell If this furnace is installed below grade contact your gas supplier for a gas detector 1 Leftand right gas supply piping These furnaces are set up to be gas piped through either the left or right side by using a street elbow and a straight pipe For the purposes of service it is recommended that the gas union be located inside the furnace when possible 22 All installations and services must be performed by qualified service personnel T 1 8 PLUGGED TAPPING Figure 18 2 leg must be used on both LP and natural gas installations prior to the furnace in order to trap oil condensate and other impurities which might otherwise lodge in the gas valve or plug the burner orifice A drip leg shall be provided at the outlet of the gas meter when there is excessive condensation between the gas meter and the furnace Failure to install a drip leg may void the limited
71. used for temporary heating of buildings or structures under construction A CAUTION These high efficiency condensing furnaces are not certified for and shall not be vented into a standard or any type of chimney A WARNING These furnaces may not be common vented with any other appliance A CAUTION The vent and air intake elbows must be kept away from bushes shrubs or any vegetation that may restrict the flow of flue products It must also be kept clear of any leaves weeds or other combustible materials Keep the vent hood clear of snow Avoid locating the terminals in areas where standing water or condensate drippage may be a problem A CAUTION Outside combustion air must not come from an area that is directly adjacent to a pool hot tub or spa Measures should be taken to prevent the entry of corrosive chemicals or vapors to the combustion and ventilation air supply Such chemicals include but are not limited to chlorinated and or fluorinated hydrocarbons such as found in refrigerants aerosol propellants dry cleaning fluids degreasers and removers Other harmful compounds may come from bleaches air fresheners or mastics Vapors from such products can form acid compounds when burned in a gas flame Should acid compounds form in your furnace it may reduce the life of the furnace A WARNING Because of the potential of odorant fade a gas leak may not be detected by smell If this furnace is installed below grade contact your gas supplie
72. vice technician or gas supplier FN WARNING PROPERTY DAMAGE PERSONAL INJURY OR LOSS OF LIFE construction e FOR SAFE OPERATION MANUAL KNOB POSITION INDICATOR NOTCH Gas Control Vaive Top View TURN OFF Gas TO APPLIANCE 1 Set thermostat to lowest setting and if equipped set the set the operating mode to COOL or OFF If service is to be performed turn off ali electric power to the appliance 3 To turn off gas control valve remove the burner compartment cover 4 Turn gas control knob clockwise to OFF position For gas valves with a switch move the switch to the OFF position Replace the burner compartment cover FROM 2 THE DIRTY FILTER DO NOT REMOVE THIS LABEL CAUTION MOVING PARTS CAN CAUSE SEVERE PERSONAL INJURY u 2 All installations and services must be performed by qualified service personnel 1 Use only with type of gas approved for this furnace Refer to furnace rating plate 2 Connect this furnace to an approved vent system only Combustion products must be carried outdoors Refer to Section D thru H of this manual The following pages contain various warnings and cautions found throughout the Thermo Pride Highboy and Dual Poise Two Stage Condensing Gas Furnace Manual Please read and comply with the statements below AWARNING This furnace is not to be
73. warranty on the furnace A WARNING All gas piping must be leak tested using a soap and water solution when the gas is turned on following the procedure outlined in Section Ill J of this manual A final test for gas leakage must be made after purging the gas line refer to Section IV B of this manual This test must be conducted with the unit operating and should include the furnace piping and gas valve Never use an open flame to check for a gas leak A CAUTION Care must be taken not to wet electronic components during leak test Wetting the primary ignition module may damage its circuitry and cause a hazardous situation Dry moisture from all leads and terminals if wetting occurs Wait at least 24 hours for the circuit to fully dry before energizing the burner circuit K FILTERS 1 CHX1 MODELS HIGHBOYS It is necessary to cut the return air opening in the bottom or side casing depending upon the needs of the specific installation NOTICE If your CHX1 will require air delivery above 1800 CFM it is advisable that both sides a combination of 1 side and the bottom or the bottom only be used for return air If a return is cut in the bottom it should be as large as the return opening in the equivalent CDX1 model See specification sheet in beginning of this manual 23 l AM KC E _ CL DRIP All installations and services must be performed by qualified service personnel This CHX1 furnace has been factory su
74. within the specified low fire manifold pressure range refer to Table 5 use the following procedure to adjust the low fire gas pressure regulator to match the specified low fire manifold pressure a Remove the gas pressure regulator adjustment cap screw from the automatic gas control valve The cap screw is located on the outlet side of the valve Refer to Figure 23 35 All installations and services must be performed by qualified service personnel Low adjustment seal screw High adjustment x seal screw I Regulator vent connection Main gas outlet Figure 23 Outlet view of two stage automatic gas control valve b Using a 3 32 in hex key or Allen wrench turn the inner adjustment screw clockwise to increase or counterclockwise to decrease the gas pressure and gas flow to the main burner c Replace the cap screw and tighten it firmly to prevent gas leakage d Referring to Table 5 measure the gas pressure and to confirm it has been adjusted to within the allowable range Repeat adjustments a through c as required Table 5 Design Gas Pressures for each Furnace Model Series Operating Mode and Type of Fuel Maximum Gas Supply Pressure in W G Minimum Gas Supply Pressure in W G 4 5 13 Adjust the room thermostat so the burner will operate on high fire only NOTICE There is a 30 second delay before the gas control will step up to high fire 14 To

Thermo Products CDX1-125N Furnace User Manual

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