Lennox International Inc. 10ACB User's Manual
Contents
1. LENA PRODUCT LITERATURE 1998 Lennox Industries Inc Dallas Texas VALUE 10 CONDENSING UNIT Value 10 condensing units are designed for expansion valve TXV and RFC systems Refer to Lennox engi neering handbook for expansion valve kits which must be ordered separately SHIPPING AND PACKING LIST 1 Assembled 10ACB condensing unit 1 45 copper street elbow 1 RFCIV refrigerant metering device bullet 1 Coupling 5 16 x 3 8 18 24 30 Check unit for shipping damage Consult last carrier immediately if damage is found GENERAL INFORMATION These instructions are intended as a general guide and do not supersede national or local codes in any way Authorities having jurisdiction should be consulted be fore installation A IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant CFC s and HCFC s as of July 1 1992 Approved methods of recovery recycling or reclaiming must be followed Fines and or in carceration may be levied for non compliance INSTALLATION INSTRUCTIONS Value Series 10ACB Condensing Units CONDENSING UNITS 1 1 2 through 5 ton Technical oe aN Supersedes 503 755M Litho U S A TABLE OF CONTENTS VALU2. VALVE FRONT SEATED SERVICE PORT CAP SCHRADER VALVE OPEN TO LINE SET WHEN VALVE IS TO OUTDOOR CLOSED FRONT SEATED COIL FIGURE 5 5 Ton Suction Line Ball Type Service Valve A ball type full service valve only is used on five ton units 10ACB60 62 These suction line service valves function the same way differences are in construction Valves are not rebuildable If a valve has failed it must be re placed A ball valve valve is illustrated in figure 6 The ball valve is equipped with a service port A schrader valve is factory installed Aservice portcap is supplied to protect the schrader valve from con tamination and assure a leak free seal SUCTION LINE BALL TYPE SERVICE VALVE VALVE OPEN USE ADJUSTABLE WRENCH ROTATE STEM CLOCKWISE 90 TO CLOSE ROTATE STEM COUNTER CLOCKWISE 90 TO OPEN STEM CAP TO OUTDOOR COIL SERVICE PORT CAP S x SERVICE PORT SCHRADER VALVE FIGURE 6 LEAK TESTING After the line set has been connected to the indoor and outdoor units the line set connections and indoor unit must be checked for leaks A WARNING Never use oxygen to pressurize refrigeration or air conditioning system Oxygen will explode on con tact with oil and could cause personal injury When using high pressure gas such as nitrogen CO for this purpose be sure to use a regulator that can control the pressure down to 1 or 2 psig Using an Electronic Leak Detector or Halide
3. 1 Connect cylinder of HCFC 22 to center port of man ifold gauge set 2 With both manifold valves closed open the valve on the HCFC 22 bottle vapor only 3 Open the high pressure side of the manifold to al low HCFC 22 into the line set and indoor unit Weigh in a trace amount of HCFC 22 A trace amount is a maximum of 2 ounces or 3 pounds pressure Close the valve on the HCFC 22 bottle and the valve on the high pressure side of the man ifold gauge set Disconnect HCFC 22 bottle 4 Connect cylinder of nitrogen with a pressure reg ulating valve to the center port of the manifold gauge set Page 6 5 Connect the high pressure hose of the manifold gauge set to the service port of the suction valve Normally the high pressure hose is connected to the liquid line port however connecting it to the suction port better protects the manifold gauge set from high pressure damage 6 Adjust nitrogen pressure to 150 psig Open the valve on the high side of the manifold gauge set which will pressurize line set and indoor unit 7 After a short period of time open a refrigerant port to make sure the refrigerant added is adequate to be detected Amounts of refrigerant will vary with line lengths Check all joints for leaks Purge nitrogen and HCFC 22 mixture Correct any leaks and re check EVACUATING Evacuating the system of non condensables is critical for proper operation of the unit Non condensables are defined a
4. E 10 CONDENSING UNIT 1 SHIPPING AND PACKING 1 GENERAL INFORMATION 1 10ACB UNIT DIMENSIONS 2 SETTING THE 3 ELECTRICAL 2 erroe wate 3 PEUMDBING 5 tid Dida weit ibd 4 REFRIGERANT METERING DEVICE 4 MANIFOLD GAUGE SET 5 LIQUID amp SUCTION LINE SERVICE VALVES 5 LEAK TESTING feces olan wiretap eaten ant dat ew ones 6 EVACUATIONS ub usen nr ov eee etr ead 7 STARUP a ente ede 8 CHARGING CONSIDERATIONS 8 CHARGING FOR RFC SYSTEMS 9 CHARGING FOR TXV SYSTEMS 10 SYSTEM OPERATION 10 MAINTENANCE mer pem eme epos 11 10ACB CHECK 6 12 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE A WARNING Product contains fiberglass wool Disturbing the insulation in this product during installation maintenance or repair will expose you to fiberglass wool Breathing this may cause lung cancer Fiberglass wool is known to the State of California to cause cancer Fiberglass wool may also cause respiratory skin and eye irritation To reduce exposure to this substance or for further information consult material safety data sheets availab
5. ant piping consists of liquid and suction lines from the condensing unit sweat connections to the indoor evaporator coil flare or sweat connections Use Lennox L10 flare or L15 sweat non flare series line sets as shown in table 1 or use field fabricated re frigerant lines Refer to unit information manual piping section for proper size type and application of field fabricated lines Sweat Connection Procedure 1 Ends of refrigerant lines must be cut square free from nicks or dents deburred Pipe must remain round do not pinch end of line 2 Wrap a wet cloth around the liquid line valve body and copper tube stub to protect from heat damage during brazing Wrap another wet cloth underneath the liquid valve to protect the base paint 3 Quench the joints with a wet cloth to prevent possible heat damage to the valve core and opening port 4 A field provided filter drier should be installed as close as possible to the expansion device REFRIGERANT METERING DEVICE 10ACB units are applicable to either RFCIV or an expan sion valve system See indoor coil installation instruc tions and the Lennox engineering handbook for ap proved RFC and TXV match ups and application information Table 1 lists 10ACB unit liquid and suction line sizes and corresponding line sets TABLE 1 REFRIGERANT LINE KITS 10ACB24 8 mm 16mm toi asm 10ACB30 3 8in 3 4in L10 41 ace DET L15 21 20 ft 50 ft 6m 15 L15 41 20
6. btract the liquid line temperature from the satu ration temperature according to the chart to de termine subcooling Saturation temperature Liquid line temperature Subcooling 5 Compare the subcooling value with those in table 5 If subcooling is greater than shown some refrig erant must be recovered If subcooling is less than shown some refrigerant must be added TABLE 5 SUBCOOLING FOR RFC SYSTEMS ommon noumsuscoouwo Tre ova ove oza e oe o Toe om 60 14 17 18 18 14 14 12 14 16 7 8 9 5 10 10 8 8 6 7 8 65 13 16 16 17 13 13 11 14 18 7 2 8 9 8 9 9 5 7 8 7 8 6 1 8 70 12 15 14 16 12 13 10 13 21 6 7 8 3 7 8 8 9 6 7 7 8 5 6 7 8 75 10 14 12 15 10 12 13 24 5 6 7 8 6 7 8 3 5 6 6 7 7 8 80 13 11 14 11 9 12 27 7 2 6 1 8 6 1 5 6 7 85 12 10 13 8 10 9 12 29 6 7 5 6 7 8 4 4 5 6 5 6 7 90 7 11 12 7 10 12 32 3 9 6 1 6 7 3 9 5 6 6 7 95 6 8 11 6 8 12 35 3 3 4 5 6 1 3 3 4 5 6 7 100 4 8 7 10 5 8 11 38 2 2 4 5 3 9 5 6 2 8 4 5 6 1 105 2 7 6 4 7 10 41 1 1 3 9 3 3 2 2 3 9 5 6 110 2 6 6 7 3 8 7 43 1 1 3 3 3 3 3 9 1 7 4 5 3 9 115 1 5 5 5 2 7 6 45 0 6 2 8 2 8 2 8 1 1 3 9 3 3 Note For best results the same electronic thermometer should be used t
7. d 5 ton units should be energized 24 hours before unit start up to prevent compressor damage as a re sult of slugging 1 Rotate fan to check for frozen bearings or binding 2 Inspect all factory and field installed wiring for loose connections 3 After evacuation is complete open liquid line and suction line service valves to release refrigerant charge contained in condensing unit into the sys tem 4 Replace stem caps and secure finger tight then tighten an additional 1 6 one sixth of a turn 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on unit nameplate If not do not start the equipment until the power company has been consulted and the voltage condition corrected 6 Set the thermostat for cooling demand turn on power to evaporator blower and close condensing unit disconnect switch to start unit 7 Recheck voltage with unit running Power must be within range shown on nameplate Check amper age draw of unit Refer to unit nameplate for cor rect running amps CHARGING CONSIDERATIONS Units are factory charged with the amount of HCFC 22 refrigerant indicated on the unit rating plate This charge is based on a matching indoor coil and outdoor coil with 20 ft 6 1m line set For varying lengths of line set refer to table 3 for refrigerant charge adjustment A blank space is provided on the rating plate to list the ac tual field charge TABLE 3 Liquid Lin
8. e Ozs per 5 ft ml per mm adjust Set Diameter from 20 ft 6 1m line set 5 16 in 2 ounce per 5 ft 8mm 57ml per 1 5m 3 8 in 3 ounce per 5 ft 10mm 85ml per 1 5m If line length is greater than 20 ft 6 1m add this amount If line length is less than 20 ft 6 1m subtract this amount If the system is void of refrigerant the recommended and most accurate method of charging is to weigh the refrigerant into the unit according to the total amount shown on the unit nameplate This may be done after any leaks have been repaired If weighing facilities are not available or if unit is just low on charge use one of the procedures outlined Charging a condensing unit is recommended during warm weather However applications arise in which charging must occur in the colder months The way the unit is charged depends on the unit s refrigerant me tering device and the outdoor ambient temperature For RFC systems weighing in the charge and subcooling are two acceptable means of charging under certain conditions For installations of an RFC system where the outdoor ambient is less than 65 F 18 weighing in the charge is the best method However in installations where the outdoor ambient is 65 F 18 or above sub cooling is the best method Weighing in the charge and the approach method are the two recommended procedures for charging the 10ACB using an expansion valve system for refrigerant metering The differe
9. ex head extension back the stem out counterclockwise until the valve stem just touches the retaining ring DANGER Do not attempt to backseat this valve Attempts to backseat this valve will cause snap ring to explode from valve body under pressure of refrigerant Personal injury and unit damage will result 3 Replace stem cap tighten firmly Tighten finger tight then tighten an additional 1 6 turn LIQUID LINE SERVICE VALVE VALVE OPEN INSERT HEX STEM CAP WRENCH HERE 2 SERVICE PORT 3 TO OUTDOOR Pom TO INDOOR CAP SCHRADER VALVE LIQUID LINE SERVICE VALVE VALVE CLOSED RETAINING RING STEM CAP SERVICE A PORT c INSERT HEX TO OUTDOOR CESAR WRENCH HERE COIL TO INDOOR COIL z SERVICE PORT CAP SCHRADER VALVE OPEN TO LINE SET WHEN VALVE IS CLOSED FRONT SEATED VALVE FRONT SEATED FIGURE 4 To Close Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and 5 16 hex head exten sion turn stem clockwise to seat the valve Tighten firmly Page 5 3 Replace stem cap Tighten finger tight then tighten an additional 1 6 turn SUCTION LINE SERVICE VALVE VALVE OPEN INSERT HEX WRENCH HERE TO INDOOR 2 STEM CAP SCHRADER P AZ VALVE TO OUTDOOR COIL SERVICE PORT CAP O SERVICE PORT SUCTION LINE SERVICE VALVE VALVE CLOSED RETAINING RING STEM CAP S TO INDOOR
10. ft 50 ft 6 15 15 65 30 ft 50 ft 10ACB42 agin 7 8in so eor 10ACB48 10 mm 22mm 9 m 15 9 m 15 m 10ACB60 FIELD FIELD 10ACB62 10 mm 29 mm FABRICATED FABRICATED Use reducer supplied in bag assembly NOTE Line length should be no greater than 50 feet 15 2 m Select line set diameters from table 1 to en sure oil return to compressor RFC Systems 10ACB units are shipped with an RFCIV metering de vice Replace existing RFCIV in indoor unit with RFCIV supplied with the outdoor unit Place the supplied RFCIV sticker on indoor cabinet after installation See table 2 for size of RFCIV bullet shipped in each 10ACB unit In cases of non traditional applications RFCIV bullet shipped may not be appropriate Refer to the in door coil installation instructions and the engineering handbook for specific orifice information TABLE 2 RFCIV DRILL SIZES 10ACB UNIT RFCIV PART RFCIV DRILL SIZE 10ACB24 66J87 0 062 10ACB42 42J52 0 080 10ACB60 42J58 0 092 RFCIV bullet is installed as shown in figure 3 Take care not to twist cap tubes when loosening seal nut from orifice body RFCIV INSTALLATION ORIFICE DISTRIBUTOR BULLET ORIFICE CONNECTION FIGURE 3 Page 4 Expansion Valve Systems Expansion valves equipped with either Chatleff or flare type fittings are available from Lennox Refer to the indoorcoil installation instr
11. le from address shown below or contact your supervisor Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 Page 1 10ACB UNIT DIMENSIONS INCHES INLET AIR INLET AIR SUCTION LINE CONNECTION 1 LIQUID LINE CONNECTION INLET AIR TOP VIEW 24 1 4 616 24 1 4 616 OUTDOOR DISCHARGE AIR COIL FAN COMPRESSOR SUCTION amp LIQUID LINE CONNECTION ELECTRICAL INLETS 2 3 4 70 3 4 19 SIDE VIEW 2 10ACB18 10ACB24 10ACB30 10ACB36 10ACB42 10ACB48 10ACB60 10ACB62 Page 2 SETTING THE UNIT Refer to unit dimensions on page 2 for sizing mounting slab platforms or supports Refer to figure 1 for instal lation clearances INSTALLATION CLEARANCES NOTE 48 inch clearance required on top of unit NOTE One side must be 36 inches Two side may be 12 FIGURE 1 Slab Mounting When installing unit at grade level install on a level slab high enough above grade to allow adequate drain age of water Top of slab should be located so run off water from higher ground will not collect around unit Roof Mounting Install unit at a minimum of 4 inches above the surface of the roof Care must be taken to ensure weight of unit is properly distributed over roof joists and rafters Ei ther redwood or steel supports are recommended ELECTRICAL In the U S A wiring must conform with current local codes and the current National Electric Code NEC I
12. n Canada wiring must conform with current local codes and the current Canadian Electrical Code CEC Refer to the furnace or blower coil installation instructions for additional wiring application diagrams and refer to unit rating plate for minimum circuit ampacity and maximum overcurrent protection size A WARNING Unit must be grounded in accordance with nation al and local codes Electric Shock Hazard Can cause injury or death Line Voltage To facilitate conduit a hole is provided in bottom of the control box Connect conduit to hole in control box with proper conduit fitting NOTE Units are approved for use with copper conduc tors only 24V Class Il Circuit 24V Class Il Circuit connections are made up in the low voltage junction box Refer to figure 2 for field wiring diagram NOTE A complete unit wiring diagram is located in side the unit control box cover 10ACB TYPICAL FIELD WIRING DIAGRAM NOTE SEE UNIT WIRING DIAGRAM FOR POWER SUPPLY CONNECTIONS CONDENSING UNIT ROOM THERMOSTAT TO 24V CLASS POWER SOURCE 20 VA MINIMUM NOTE IF INDOOR UNIT IS NOT EQUIPPED WITH BLOWER RELAY IT MUST BE FIELD PROVIDED AND INSTALLED P 8 3251 OR EQUIVALENT 24V CLASS II INSTALLED AT FACTORY 24V CLASS II FIELD INSTALLED TYPICAL INDOOR UNIT TRANSFORMER HEATING CONTROLS HEATING SPEED PER NATIONAL AND LOCAL CODES K3 INDOOR BLOWER RELAY FIGURE 2 Page 3 PLUMBING Field refriger
13. nce between the two involves the outdoor ambient temperature For expansion valve systems where the outdoor ambient temperature is 60 F 16 C or above the approach method may be used For expansion valve systems where the outdoor ambient temperature is below 60 F 16 weighing in the charge is recommended Page 8 TABLE 4 NORMAL OPERATING PRESSURES IN PSIG LIOUID AND SUCTION 10 PSIG ENTERING tees pe p p pep peas pere pem pes pe pe pee Dew epe re s se or o wp e EH E as N N CEE N re pm pm per ps pm 5 zm oo e pm pon pep er zs p po p oe 2 These are typical pressures only Indoor evaporator match up indoor air quality and evaporator load will cause the pressures to vary A IMPORTANT Use table 4 as a general guide for performing main tenance checks Table 4 is not a procedure for charging the system Minor variations in these pressures may be expected due to differences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the sys tem Used prudently table 4 could serve as a useful service guide Before charging the unit follow the procedure below to determine the liquid line temperature and the out door ambient temperature 1 Connect manifold gauge set to service valves low pressure gauge
14. o check both outdoor ambient and liquid temperatures CHARGING FOR TXV SYSTEMS Weighing in the Charge TXV Systems lt 60 F 16 C Outdoor Temp 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the factory charge as shown on the out door unit s rating plate The Approach Method TXV Systems gt 60 F 16 Outdoor Temp Having taken the outdoor ambient and liquid line tem perature readings subtract the outdoor ambient tem perature from the liquid line temperature to determine the Approach temperature Liquid Line F C Out door Ambient F Approach Temperature The resulting difference Approach temperature should agree with the values given in table 6 If not add refrig erant to lower the approach temperature or recover re frigerant from the system to increase the approach temperature TABLE 6 APPROACH METHOD MODEL APPROACH TEMPERATURE NO LIQUID LINE OUTDOOR AMBIENT F 10ACB12 7 3 9 CS Paces CS 0069 30Ac830 10 5 6 _ 12167 T0AC42 148 10 48 13 7 2 macso een o oasa O 1267 Note For best results the same electronic thermometer should be used to check both outdoor ambient and liquid temperatures SYSTEM OPERATION Condensing unit and indoor blower cycle on demand from room thermostat When thermostat blower switch is switched to ON
15. position indoor blower oper ates continuously Crankcase Heater Three and one half four and five ton units are equipped with internal self regulating crankcase heaters Compressor Start Kit Three and one half four and five ton single phase units have internal start components and do not require field installation of a compressor start kit Timed Off Control Option Units ONLY Option units are factory equipped with a timed off control which helps equalize system pressures that al lows the compressor to start in an unloaded condition as well as preventing compressor short cycling The timed off control delays compressor start up for five minutes on thermostat demand Mounted in the con trol box the control is wired between thermostat ter minal Y and the compressor contactor High and Low Pressure Switches International and Option Units ONLY 10ACB international and option units are factory equipped with both high and low pressure switches The pressure switches are located on the valve cores in the liquid line to allow easy access The manually reset high pressure switch protects the system from high pressure conditions as a result of a fan failure or a Page 10 blocked or dirty coil The low pressure switch SPST NO protects the system compressor from damage due to loss of charge The switch will trip at 15 5 psig 103 34 kPa and automatically resets at 25 3 psig 172 21 kPa Refrigerant Sight Gla
16. re regulator set to 150 psig and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves A CAUTION Danger of Equipment Damage Avoid deep vacuum operation Do not use com pressors to evacuate a system Extremely low vacuums can cause internal arcing and compressor failure Damage caused by deep vacuum operation will void warranty 6 Shut off the nitrogen cylinder and remove the man ifold gauge hose from the cylinder Open the man ifold gauge valves to release the nitrogen from the line set and indoor unit 7 Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until the absolute pres sure does not rise above 5mm of mercury within 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 8 Depending on the equipment used to determine the vacuum level the following units are equiva lent to absolute pressure of 5mm of mercury or 500 microns 9 When the absolute pressure requirement above has been met disconnect the manifold hose from the vacuum pump and connect it to an upright bottle of HCFC 22 refrigerant Open the manifold gauge valves to break the vacuum in the line set and in door unit Close manifold gauge valves and shut off HCFC 22 bottle and remove manifold gauge set Page 7 A IMPORTANT Crankcase heater used on 3 1 2 4 an
17. roce dure 3 Belt Drive Blowers Check belt for wear and proper tension 4 Check all wiring for loose connections 5 Check for correct voltage at unit blower operat ing 6 Check amp draw on blower motor Unit nameplate Actual Page 11 Job Name Date Job Location tA State Installer State Unit Model No ____________ Serial No Service technician Nameplate Voltage ___ Amps Minimum Circuit Ampacity _ Condenser Fan Maximum Overcurrent Protection Size ________ Compressor Electrical Connections Tight Indoor Filter Clean Indoor Blower Supply Voltage Unit Off S P Drop Over Evaporator Dry Refrigerant Lines COOLING SECTION Leak Checked Condenser Entering Air Temperature Service Valves Fully Open Discharge Pressure Suction Pressure Properly Insulated L Refrigerant Charge Checked 1 Service Valve Caps Tight Condenser Fan Checked Voltage With Compressor Operating THERMOSTAT Properly Set L_ Level Page 12
18. s any gas that will not condense under temper atures and pressures present during operation of an air conditioning system Non condensables and water va por combine with refrigerant to produce substances that corrode copper piping and compressor parts 1 Connect manifold gauge set to the service valve ports as follows low pressure gauge to suction line service valve high pressure gauge to liquid line service valve 2 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set 3 Open both manifold valves and start vacuum pump 4 Evacuate the line set and indoor unit to an absolute pressure of 23mm of mercury or approximately 1 inch of mercury During the early stages of evacua tion it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in absolute pressure A rapid rise in pressure indicates a relatively large leak If this occurs the leak testing procedure must be repeated NOTE The term absolute pressure means the to tal actual pressure within a given volume or sys tem above the absolute zero of pressure Absolute pressure in a vacuum is equalto atmospheric pres sure minus vacuum pressure 5 Whenthe absolute pressure reaches 23mm of mer cury close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump Attach the manifold center port hose to a nitrogen cylinder with pressu
19. ss Option Units ONLY A refrigerant sight glass is provided in the bag assem bly for field installation The sight glass can be installed in the liquid line to help monitor system charge MAINTENANCE A WARNING Electric shock hazard Can cause inju ry or death Before attempting to per form any service or maintenance turn the electrical power to unit OFF at dis connect switch es Unit may have multiple power supplies At the beginning of each cooling season the system should be checked as follows 1 Clean and inspect condenser coil Coil may be flushed with a water hose Make sure power is off before cleaning 2 Visually inspect connecting lines and coils for evi dence of oil leaks 3 Check wiring for loose connections 4 Check for correct voltage at unit unit operating 5 Check condenser fan motor amp draw Unit nameplate Actual NOTE If owner complains of insufficient cooling the unit should be gauged and refrigerant charge checked Refer to section on refrigerant charging in this instruction Evaporator Coil 1 Clean coil if necessary 2 Check connecting lines and coils for evidence of oil leaks 3 Check condensate line and clean if necessary Indoor Unit 1 Clean or change filters 2 Adjust blower speed for cooling The pressure drop over the coil should be measured to determine the correct blower CFM Refer to the unit information service manual for pressure drop tables and p
20. to suction valve service port high pressure gauge to liquid valve service port Con nect the center manifold hose to an upright bottle of HCFC 22 Close manifold gauge set valves 2 Set the room thermostat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 3 Record the outdoor ambient temperature For greater accuracy use the same electronic ther mometer to measure liquid temperature 4 When thermostat demand has been satisfied switch to cooling mode with a set point of 68 F 20 C When pressures have stabilized record the liquid line temperature 5 The outdoor temperature will determine which charging method to use Proceed with the ap propriate charging procedure below CHARGING FOR RFC SYSTEMS Weighing in the Charge Method RFC Systems lt 65 F 18 C Outdoor Temp 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the factory charge as shown on the out door unit s rating plate The Subcooling Method RFC Systems 65 F 18 C Outdoor Temp 1 With the manifold gauge hose still on the liquid ser vice port and the unit operating stably record the liquid line temperature 2 At the same time record the liquid line pressure reading 3 Using a temperature pressure chart for HCFC 22 determine the saturation temperature forthe liquid line pressure reading Page 9 4 Su
21. uctions orthe engineer ing handbook for applicable expansion valves for use with specific match ups If an expansion valve application is desired with indoor coil product shipped with an RFCIV orifice the RFCIV re strictor must be removed before installing the expan sion valve IMPORTANT Failure to remove RFCIV when installing an expan sion valve to the indoor coil will result in improper operation and damage to the system MANIFOLD GAUGE SET A manifold gauge set equipped with low loss hoses should be used when checking unit charge A manifold gauge set with anything other than low loss hose should not be used LIQUID amp SUCTION LINE SERVICE VALVES The liquid line and suction line service valves figures 4 and 5 and gauge ports are accessible from outside the unit The service ports are used for leak testing eva cuating charging and checking charge The valve is equipped with a service port A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and serve as the primary leak seal To Access Schrader Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6 turn To Open Liquid or Suction Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and 5 16 h
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