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Bryant 551a User's Manual

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2. z must be AD DME1701 1 YY E F or AD DME1711 1 Outdoor Air Enthalpy usse purse SSS SSH acri L A CROUTENTOO1A00 i Unoccupied S I Contact 470 ohm gt 1 5 watt i N 1 x I Violet Resistor m U ca N Ts gt LM HH ba saaa 24 VAC must be present Pd xs on BI for the system to be m OAT a van i Su unoccupied z iole RM ss COM EJ White fo OAH Red lt Return Air Enthalpy 15V CRRETENTOO1A00 RAT Tan T Violet as Violet PT SOM White 4G i 77 CO Sensors er RAH T3 5 il 15V Red LM A d CRCDXSENO004A00 kb 7 N N jsp gm lE 2to 10 VDC at N GO S n wr 0 to 2000 ppm E COM prc I DAT Remote COM Minimum Position REM v ENIM EE POT s Line COM L Pp a p S Voltage LED pour MR qu Z COM 4 DE ohm AAA VERE NL rte M P N r Rc c RE X Y RE z 20 mA LED I e d Remote _ due N LED J in AS Field supplied Wiring Wiring Included Fig 24 Typical EconoMi er Sensor Wiring 15 Install Motormaster amp Controls Only one Motormaster control is required per unit The Motormaster control must be used in conjunction with the Accessory 0 F Low Ambient Kit purchased separately The Motormaster device controls outdoor fan no 1 while out door fans no 2 and 3 are sequenced off by the Accessory 0 F Low Ambien
3. ACTION TAKEN BY ECONOMISER Outdoor air damper is stroked fully open then closed automatic test procedure takes 3 minutes to complete Flash One Control board fault System shutdown Flash Three Actuator fault Flash Four Flash Two Thermostat fault i e Y2 without Y1 System shutdown until corrected Revert to mechanical cooling only i i Continue operation with damper at minimum position Discharge air thermistor fault Revert to mechanical cooling only Critical Fault Continue operation with damper at minimum position Flash Five Outdoor air temperature sensor fault Flash Six Disable mechanical cooling lockout Outdoor air humidity sensor fault Continue operation with dry bulb or dry bulb differential switchover Continue operation with single enthalpy EconoMi er switchover or dry bulb EconoMi er switchover without Return air temperature sensor fault humidity sensor i di Continue operation with single enthalpy differential dry Return air humidity sensor fault bulb or dry bulb EconoMi er switchover Carbon Dioxide CO2 sensor fault Continue operation without ventilation control Onboard adjustment potentiometer fault Continue operation with default potentiometer settings Flash Seven Flash Eight Flash Nine Flash Ten Non Critical Fault If the CONFIG button is pressed and held for more than 30 seconds and released the EconoMi er controller will enable the enthalpy comparison strategy with ou
4. 2 Remove fan top grille assembly and loosen fan hub screws 3 Adjust fan height on unit using a straightedge placed across the fan orifice 4 Tighten setscrews and replace rubber hubcap to pre vent hub from rusting to motor shaft 5 Fill hub recess with permagum if rubber hubcap is missing NOTE Dimensions are in inches Fig 33 Condenser Fan Adjustment 551A155 180 SHIELD NOTE Dimensions are in inches Fig 34 Condenser Fan Adjustment 551A240 VII ECONOMISER ADJUSTMENT A LED Indication The EconoMi er controller features an onboard diagnostic LED light emitting diode that flashes to indicate its status See Table 17 for flash codes The controller also has terminal connections REM LED for remotely mounting an LED if desired The flash code priorities are as follows 1 On Off or continuous flash 2 Critical fault 3 Non critical fault If any sensors are opened shorted or removed the EconoMi er determines whether the failure is critical or non critical and flashes the appropriate code If a non critical sensor fault occurs i e outdoor air humidity the EconoMi er automatically reconfigures its control strategy to a more appropriate mode If a critical sensor fault occurs i e supply air sensor the EconoMi er reverts to a safe mode of operation until the sensor problem is resolved B Manual Configuration Pushbutton The EconoMi er controller also features an onboard button CO
5. Perfect Humidity Page SAFETY CONSIDERATIONS 1 INSTALLATION ee 1 17 I Step 1 Provide Unit Support 1 II Step 2 Rig and Place Unit 1 Ill Step 3 Field Fabricate Ductwork 7 IV Step 4 Make Unit Duct Connections 7 V Step 5 Trap Condensate Drain 7 VI Step 6 Make Electrical Connections 8 VII Step 7 Make Outdoor Air Inlet Adjustments iie n mnn 11 VIII Step 8 Install Outdoor Air Hood 12 IX Step 9 Install All Accessories 15 X Step 10 Install Humidistat for Optional Perfect Humidity Dehumidification Package 16 STARTUP enr nt n ddp e epus 18 25 SERVICE Lope vehe Wk hae GRE AE epa bada 26 32 TROUBLESHOOTING 33 34 START UP CHECKLIST CL 1 SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical compo nents Only trained and qualified service personnel should install repair or service air conditioning equipment Untrained personnel can perform basic maintenance func tions of cleaning coils and filters and replacing filters All other operations should be performed by trained service per sonnel When working on air conditioning equipment observe precautions in the literature tags and la
6. Concentric Duct Air Distribution 551A180 and 240 Shown IV STEP 4 MAKE UNIT DUCT CONNECTIONS Unit is shipped for thru the bottom duct connections Duct work openings are shown in Fig 6 Field fabricated concen tric ductwork may be connected as shown in Fig 7 and 8 Attach all ductwork to roof curb and roof curb basepans Refer to installation instructions shipped with accessory roof curb for more information V STEP 5 TRAP CONDENSATE DRAIN See Fig 4 5 and 9 for drain location Plug is provided in drain hole and must be removed when unit is operating One 3 4 in half coupling is provided inside unit evaporator sec tion for condensate drain connection An 81 5 in x 3 4 in diameter nipple and a 2 in x 3 4 in diameter pipe nipple are coupled to standard 3 4 in diameter elbows to provide a straight path down through holes in unit base rails see Fig 10 A trap at least 4 in deep must be used 6 23 MAX 5 95 MAX 516 ES ME ss BAFFLE Em Shaded area indicates block off panels NOTE Dimension A A and B B are obtained from field supplied ceil ing diffuser AN CAUTION Concentric ducts may only be installed on units without electric heat Personal injury or unit damage may result Fig 8 Concentric Duct Details INDOOR FAN MOTOR ACCESS FILTER ACCESS 3 4 FPT DRAIN 1 3 8 CONNECTION D
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8. i 42 56 117 135 166 155 175 175 i 18 8 42 56 117 135 172 161 175 175 56 75 156 180 176 200 200 225 18 8 56 75 156 180 182 206 200 225 6 175 175 2 a 40 35 40 2 3 5 5 7 7 1 1 1 1 1 1 4 4 N S aa T E 8 8 39 39 66 66 35 coco O O gt oojoo 7 0 40 18 0 18 40 3 32 3 32 0 60 6 72 7 9 9 5 8 5 A o 39 5 6 39 5 6 66 82 82 110 110 86 86 110 110 00 co oo 4 5 43 5 6 N o 0 0 0 460 0 9 Q101 0 CO QO N N 3 5 3 62 TES 7 7 106 125 109 125 124 124 150 150 129 129 150 150 26 34 71 82 124 134 150 150 daban iay j 6 18 8 26 34 71 82 129 140 150 150 42 56 117 135 178 166 200 175 6 18 8 42 56 117 135 183 172 200 175 9 460 I i 9 66 j 66 96 96 9 6 9 9 9 66 6 96 96 56 75 156 180 187 211 200 225 18 8 56 75 156 180 193 217 200 225 61 63 8 65 8 68 8 82 85 90 112 125 115 125 See Legend on page 10 co e 0 3 0 3 0 e LEGEND FLA Full Load Amps HACR Heating Air Conditioning and Refrigeration IFM Indoor Evaporator Fan Motor LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection NEC National Electrical Code OFM Outdoor Condenser Fan Motor RLA Rated Loa
9. CO Control Setup If a COa sensor is not being used proceed to the next section If a CO2 sensor is being used perform the following 1 Determine the value at which you want the minimum position of the dampers to begin opening to allow a greater amount of outdoor air to enter The range is 800 to 1 400 ppm 2 Locate the CO SP PPM potentiometer and adjust to the desired set point See Fig 16 13 F Mechanical Cooling Lockout Determine the outdoor air temperature at which you want the mechanical cooling compressors to be disabled L ocate the mechanical cooling lockout MECH CLG LOCKOUT potentiometer To disable this feature turn the potentiome ter counterclockwise CCW to the OFF position Otherwise set the value between 10 and 60 F Mechanical cooling will not operate when the outdoor air temperature is below this value See Fig 16 G Dry Bulb Changeover Set Up Determine the dry bulb changeover set point from Table 6 The settings areA B C and D Locatethe ECON SP potenti ometer and set the dry bulb changeover set point See Fig 16 When the OAT is above this set point the damper is limited to minimum position setting If a potentiometer fails its setting will default to the values in Table 7 Table 5 EconoMi er Switchover Control Strategy SENSORS REQUIRED Outdoor Air Temperature Outdoor Air Enthalpy Return Air Temperature Return Air Enthalpy ECONOMISER SWITCHOVER STRATEGY Must be
10. EconoMi ser a Calculate of outside air using the following formula Outdoor air through EconoMi er Outdoor _ Mixture Temp Return Air Temp air Outdoor Temp Return Air Temp the b Multiply total CFM by percentage outdoor air this gives outdoor air volume in CFM An WARNING Personal Injury Hazard Avoid possible injury by keeping fingers away from damper blades IX STEP 9 INSTALL ALL ACCESSORIES After all the factory installed options have been adjusted install all field installed accessories Refer to the accessory installation instructions induded with each accessory A Motormaster Control Installation 551A155 and 180 Only Install Field Fabricated Wind Baffles Wind baffles must be field fabricated for all units to ensure proper cooling cyde operation at low ambient temperatures See Fig 25 for baffle details Use 20 gage galvanized sheet metal or similar corrosion resistant metal for baffles Use field supplied screws to attach baffles to unit Screws should be 1 4 in diameter and 5 g in long Drill required screw holes for mounting baffles N CAUTION To avoid damage to the refrigerant coils and electrical components use recommended screw sizes only Use care when drilling holes exse 2 Unoccupied Control d Part number on the control
11. LB DAT D In com TO v2 REM POT PLI L6 com CO 000 I Ao LED E z C com com D 42 48 ELECTRIC HEAT OPTION ELECTRIC HEAT OPTION ELECTRIC HEAT OPTION HCI Hc2 HCI HC2 HC3 HCI HC2 HC3 HC4 HTRI HTR2 HTRI HTR2 HTR3 HIRI HTR2 HTR3 o o o o o ojo O ojo O o ojo o ojo O o o o ololo o LS y LS 7 EN 182 1821 Go A 1821 HTR4 oP oP oP oP oP A B C TROUBLESHOOTING Refer to Tables 18 20 for troubleshooting details Table 18 Cooling Service Analysis PROBLEM CAUSE REMEDY Compressor and condenser fan will not start Compressor will not start but condenser fan runs Compressor cycles other than normally satisfying thermostat Compressor operates continuously Excessive head pressure Head pressure too low Excessive suction pressure Suction pressure too low LEGEND Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective thermostat contactor transformer or control Replace component relay Compressor motor burned out seized or internal Determine cause Replace compressor overload open Defective overload Determine cause and replace Compressor locked out Determine cause for safety trip and reset lockout One leg of 3 phase power dead Replace fuse or reset circuit breaker Determine cause Refrigerant overcharge or undercharge Recover refrigerant evacuate system and recharge to nameplate Fau
12. MOTORS Condenser fans and motors are factory set Refer to Condenser Fan Adjustment section page 28 as required Be surethat fans rotate in the correct direction IX RETURN AIR FILTERS Check that correct filters are installed in filter tracks See Table 1 Do nat operate unit without return air filters X OUTDOOR AIR INLET SCREENS Outdoor air inlet screens must be in place before operating unit XI ACCESSORY ECONOMISER ADJUSTMENT Remove filter access panel Check that outdoor air damper blades are dosed and return air damper blades are open EconoMi er operation and adjustment is described in Base Unit Operation and EconoMi er Adjustment sections this page and page 28 respectively XII BASE UNIT OPERATION A Cooling Units Without EconoMi er When thermostat calls for cooling terminals G and Y1 are energized The indoor evaporator fan contactor IFC and compressor contactor no 1 C1 are energized and evaporator fan motor compressor no 1 and condenser fans start The condenser fan motors run continuously while unit is cooling If the thermostat calls for a second stage of cooling by energizing Y 2 compressor contactor no 2 C2 is ener gized and compressor no 2 starts B Heating Units Without EconoMi er If Accessory or Optional Heater is Installed Upon a call for heating through terminal W1 IFC and heater contactor no 1 HCl are energized On units equipped for 2 stages of heat when additi
13. NIVHO VIG 8 E eoz evry 621 see e ozv ese 08 v6Z os t ove uu ur ui ur ui y Ba qr 6x gn 5y qt 62 qt Bx av 5j an VISS LINN a H3NH02 Table 1 Physical Data UNIT 551A s 898595 1800 220 NOMINAL CAPACITY tons OPERATING WEIGHT Ib Unit EconoMi er Roof Curbt Perfect Humidity Dehumidification Package COMPRESSOR Quantity Model Ckt 1 Ckt 2 1 ZR72KC 1 ZR57KC 1 ZR94KC 1 ZR72KC 1 ZR125KC 1 ZR108KC Number of Refrigerant Circuits 2 2 2 Crankcase Heater Watts 70 70 70 Loading of Full Capacity 0 56 100 0 60 100 0 60 100 Oil oz Ckt 1 Ckt 2 60 66 85 60 110 110 REFRIGERANT TYPE Expansion Device Operating Charge Ib Circuit 1 Circuit 2 CONDENSER COIL Cross Hatched 3 g in Copper Tubes Aluminum Lanced Aluminum Pre Coated or Copper Plate Fins Rows Fins in 4 15 4 15 4 15 Total Face Area sq ft 21 7 CONDENSER FAN Propeller Type Nominal Cfm 10 500 Quantity Diameter in 22 3 22 Motor Hp Rpm S 1 5 1050 Watts Input Total 1100 EVAPORATOR COIL Rows Fins in Total Face Area sq ft EVAPORATOR FAN Centrifugal Type Quantity Size in 12x 12 2 12 x 12 Type Drive Belt Belt Nominal Cfm 6000 8000 Std Motor Hp 5 7 5 Opt Motor Hp Motor Nominal Rpm 1745 1745 Std Maximum Continuous Bhp 6 13 9 47 208 v 10 33 230 v and 460 v Opt Maximum Continuous Bhp N A N A Motor Frame Size 1
14. OG co cn 02 O N ni i CO 0200010000 O O Om IO 1 1 1 1 1 1 2 2 2 2 3 5514155 12 TONS cont Available External Static Pressure A wg Cm 43 14 16 a OP 1337 ts Pem EM 1343 2432 1418 2683 1351 2577 LEGEND 2 Static pressure losses i e EconoMi er must be added to exter Bhp Brake Horsepower nal static pressure before entering Fan Paana table FIOP Factory Installed Option 3 Interpolation is permissible Do not extrapolate Watts Input Watts to Motor 4 Fan performance is based on wet coils clean filters and casing losses See Table 13 for accessory FIOP static pressure Standard low medium static drive range is 834 to 1064 rpm Alternate information I high static drive range is 1161 to 1426 Other rpms require a field 5 Extensive motor and drive testing on these units ensures that the supplied drive full bhp and watts range of the motor can be utilized with confi dence Using your fan motors up to the watts or bhp rating shown NOTES will not result in nuisance tripping or premature motor failure Unit 1 Maximum continuous bhp for the standard motor is 3 13 The max imum continuous watts is 2700 Do not adjust motor rpm such that motor maximum bhp and or watts is exceeded at the maximum operating cfm warranty will not be affected Use of a field supplied motor may affect wiring size Contact your Bryant
15. Perfect Humidity Operation Diagram 24 Table 14 Perfect Humidity Dehumidification Package Static Pressure Drop in wg UNIT SIZE UNIT NOMINAL s514 TONS 300 400 500 Table 15 Fan RPM at Motor Pulley Settings 240 tt rt tf 1369 1347 1325 1303 1281 1259 1237 1215 1193 Approximate fan rpm shown TIndicates standard drive package Indicates alternate drive package ttDue to belt and pulley style pulley cannot be set to this number of turns open Table 16 Evaporator Fan Motor Specifications UNIT NOMINAL MAX EFF MAX MAX 155 2 9 208 2700 85 8 3 13 2 34 Standard 230 2700 85 8 3 13 2 34 Motor 460 2700 85 8 3 13 2 34 155 208 3775 85 8 4 38 3 27 Optional 230 3775 85 8 4 38 3 27 Motor i 460 3775 85 8 4 38 3 27 208 5180 87 5 6 13 4 57 5 180 5 230 5180 87 5 6 13 4 57 5 460 5180 87 5 6 13 4 57 oe 208 7915 88 5 9 47 7 06 230 8640 88 5 10 33 7 71 460 8640 88 5 10 33 7 71 LEGEND BHP Brake Horsepower 25 SERVICE N WARNING Before performing service or mainte nance operations on unit turn off main power switch to unit and install lockout tag on disconnect switch Turn off acces sory heater power switch if applicable Electrical shock could cause personal injury I CLEANING Inspect unit interior at beginning of each heating and cooling season and as operating conditions require Remove unit top panel and or side panels for
16. See Fig 29 As the warm liquid passes through the subcooler coils it is exposed to the cold supply airflow coming off the evaporator coils and the liquid is further cooled to a temperature approaching the evaporator coil leaving air temperature The state of the refrigerant leaving the subcooler coils is a highly subcooled liquid refrigerant The liquid then enters a thermostatic expansion valve TXV where the liquid is dropped to the evaporator pressure The TXVs can throttle the pressure drop of the liquid refrigerant and maintain proper conditions at the compressor suction valves over a wide range of operating conditions The liquid proceeds to the evaporator coils at a temperature lower than normal cooling operation This lower temperature is what increases the latent and sensible capacity of the evaporator coils The 2 phase refrigerant passes through the evaporators and is changed into a vapor The air passing over the evaporator coils will become colder than during normal operation as a result of the colder refrigerant temperatures However as it passes over the subcooler coils the air will be warmed decreasing the sensible capacity and reducing the sensible heat of the roof top unit As the refrigerant leaves the evaporator the refrigerant passes a subcooler control low pressure switch S LPS1 for circuit 1 or S LPS2 for circuit 2 in the suction line This low pressure switch will deactivate the Perfect Humidity pack age wh
17. access to unit interior A Evaporator Coil Clean as required with a commercial coil deaner B Condenser Coil Clean condenser coil annually and as required by location and outdoor air conditions Inspect coil monthly dean as required C Condensate Drain Check and dean each year at start of cooling season In win ter keep drains and trap dry D Filters Clean or replace at start of each heating and cooling season or more often if operating conditions require Refer to Table 1 for type and size E Outdoor Air Inlet Screens Clean screens with steam or hot water and a mild detergent Do not use throwaway filters in place of screens II LUBRICATION A Compressors Each compressor is charged with the correct amount of oil at the factory Conventional white oil Sontext 200LT is used White oil is compatible with 3GS oil and 3GS oil may be used if the addition of oil is required See compressor name plate for original oil charge A complete recharge should be four ounces less than the original oil charge When a com pressor is exchanged in the field it is possible that a major portion of the oil from the replaced compressor may still be in the system While this will not affect the reliability of the replacement compressor the extra oil will add rotor drag and increase power usage To remove this excess oil an access valve may be added tothe lower portion of the suction lineat the inlet of the compressor The co
18. approved humi distat To install the humidistat perform the following procedure 1 Locate humidistat on a solid interior wall in the con ditioned space Location should be a well ventilated area to sense average humidity 2 Route thermostat cable or equivalent single leads of colored wire from humidistat terminals through con duit in unit to the low voltage connection on the 2 pole terminal strip TB3 as shown in Fig 27 and Fig 28 16 TB3 LII LLL FIELD CONTROL WIRING FACTORY INSTALLED JUMPER REMOVE IF HUMIDISTAT IS USED Fig 28 Typical Perfect Humidity Dehumidification Package Control Box MOTORMASTER SENSOR LOCATION NOTES 1 All sensors are located on the eighth hairpin up from the bottom 2 Field installed tubing insu lation is required to be installed over the TXV bulb and capilary tube for proper operation at low ambients Tubing insula tion is only required on the portion of suction line located between indoor and outdoor section HAIRPIN END Fig 26 Motormaster and Motormaster III Sensor Locations A PERFECTHUMDTY SS TO CRANKCASE HEATER CIRCUITS LEGEND CB Circuit Breaker SEEOANIS LLSV Liquid Line Solenoid Valve LPS Low Pressure Switch TB Terminal Block FACTORY INSTALLED JUMPER TRAN Transformer REMOVE IF HUMIDISTAT IS USED Fig 27 Typical Perfect Humidify Dehumidification Package Hum
19. build up and turns off the compressor allowing the coil to clear Once frost has melted the compressor can be reenergized by reset ting the compressor lockout E Heating Units With EconoMiSer If Accessory or Optional Heater is Installed When the room thermostat calls for heat the heating con trols are energized as described in the Heating Units With out EconoMi er section The IFM is energized and the EconoMi er damper modulates to the minimum position When the thermostat is satisfied the damper modulates closed F Units With Perfect Humidity Dehumidification Package When thermostat calls for cooling terminals G and Y1 and or Y2 and the compressor contactor C1 and or C2 are ener gized The indoor evaporator fan motor I F M compressors and outdoor condenser fan motors OF M start The OFMs run continuously while the unit is in cooling As shipped from the factory both Perfect Humidity dehumidification cir cuits are always energized If Perfect Humidity circuit modulation is desired a field installed wall mounted humidistat is required If the Perfect Humidity humidistat is installed and calls for the Perfect Humidity subcooler coil to operate the humidistat internal switch dloses This energizes the 3 way liquid line solenoid valve coils LLSV1 for circuit 1 and LL SV2 for circuit 2 of the Perfect Humidity circuits forcing the warm liquid refrig erant of the liquid line to enter the subcooler coils
20. following procedure to install the return air temperature sensor part no CRRETTMP001AO00 or return air enthalpy sensor part no CRRETENTOO1AO0 1 Attach the sensor to the mounting bracket using 2 self tapping 4 2 in screws provided 2 Mount the bracket to the inside of the return air opening flange using a l 4in nut driver and 2 no 6 sheet metal screws NOTE The sensor must be mounted in an upright position 3 Feed the sensor wiring through the bushing in EconoMi er to secure wires 4 Route sensor wiring harness from sensor to EconoMi er control module Secure wiring harness to theoriginal harness using tie wraps 5 Wire the sensor to the EconoMi er control module SeeFig 23 and 24 x RETURN AIR FILTER S ACCESS PANEL Fig 18 Outdoor Air Hood Component Location OUTDOOR AIR HOOD AND MOUNTING BRACKETS Sy FILTER PACKAGE AND HOOD COMPONENTS HOOD TOP PANEL HOOD DRAIN PAN UPPER FILTER RETAINER SEAL STRIP Fig 19 Seal Strip Location Air Hood Cross Sectional View BAFFLE 180 AND 240 ONLY LOWER FILTER RETAINER I T 1 FILTER SUPPORT BRACKET HOOD SIDE PANELS 2 HOOD TOP PANEL BAFFLE 180 AND 240 ONLY FILTER RETAINER FILTER SUPPORT BRACKET HOOD DRAIN PAN UPPER FILTER RETAINER NOTE The outdoor air hood comes with a baffle which is used on 180 and 240 units only discard baffle for 155 units Fig 20 Ou
21. in place The shaft cannot be inserted until the Allen bolt is moved 3 Insert the disconnect shaft into the square hole on the disconnect switch The end of the shaft is spe cially cut and the shaft can only be inserted in the correct orientation 4 Tighten the Allen bolt to lock the shaft into position Close the control box door 6 Attach the handle to the external access door with the two screws provided When the handle is in the ON position the handle will be vertical When the handle is in the OFF position the handle will be horizontal 7 Turn the handle to the OFF position and close the door The handle should fit over the end of the shaft when the door is closed 8 The handle must be in the OFF position to open the control box door ul D Optional Convenience Outlet On units with optional convenience outlet a 115 v GFI ground fault interrupt convenience outlet receptacle is pro vided for field wiring Field wiring should be run through the 7 g in knockout provided in the basepan near the return air opening 6T3 4T2 2T1 LOAD 100 e YEL BL e e e ANP BLK YEL BLU e s NONONO LOAD c3 UNIT POWER NN A oe NON FUSED DISCONNECT M LI
22. intersection point on the cooling charging chart If inter section point on chart is above line add refrigerant If inter section point on chart is below line carefully recover some of the charge Recheck suction pressure as charge is adjusted BOTH CIRCUITS ALL OUTDOOR FANS MUST BE OPERATING LIQUID TEMPERATURE AT LIQUID VALVE DEG F 50 100 150 200 250 300 350 400 LIQUID PRESSURE AT LIQUID VALVE PSIG Fig 35 Cooling Charging Chart NOTE Indoor air CFM must be within normal operating range of unit All outdoor fans must be operating The TXV thermostatic expansion valve is set to main tain between 15 and 20 degrees of superheat at the compres sors The valves are factory set and should not require re adjustment D Perfect Humidity System Charging The system charge for units with the Perfect Humidity option is greater than that of the standard unit alone The charge for units with this option is indicated on the unit nameplate drawing To charge systems using the Perfect Humidity Dehumidification package fully evacuate recover and re charge the system to the nameplate specified charge level To check or adjust refrigerant charge on systems using the Perfect Humidity Dehumidification package charge per the standard subcooling charts The subcooler MUST be deenergized to use the charging charts The charts referenc
23. q x YEL THK YEL uu FM a uL 6 023 ALU KO BLU ore or YEL 34 HS YEL 0 bo CAP1 OFM YEL BLK QGMHID BLK QT po ro B1 CAP2 2 2 oFM2 2 YEL QT 9 o CAP3 3 OFM3 31 YEL q Fu2 p CRI B K FUL ve BLK cro ax 8448 BLK e YEL O 2 0U CH2 asov is C2 DU1 YEL CHI YEL YEL 4 CH2 alk eo YEL Nw 2 oRN YEL BLK L an 182 DA Ed c2 9 10 11 BRN 2 orc DOS pri 26 28 c BRN 2 orc om Ts ELECTRIC V10 is2 HEAT wcip BRN C TB2 OPTION HC1 BRN TRANI sru ow De 20 ORN BhN BRN 3 IFR amp WHT BLU OFX 2 BRN 2 IFC 13 14 COOL alu Laa Moo Vio w VI0 e oe oe Vio CENE EmN D c2 1 2 3 YY BLU 3 I 10 C C 2 pis K paa Las aneas ix YEL w DE I CLOT NOTE 6 i m DERE 22 ORN SR m rere ba Ha PNK K YEL PNK ORN dd U S iu ad PL pL1 8 CL02 NOTE 6 FIELD THERMOSTAT as M eE PNK kus ae X gen RED TO ECONOMIS ER OPTION ACCESSORY J SHEET 2 au LL wr L ew Fig 36 Typical Wiring Schematic 5514180 460v Shown 31 ECONOMISER OPTION ACCESSORY OAT RED 24 VAC OAT TAN BRN 24 COM COM VIO LEN _ GRN GND OAH WHT BLU CL
24. selected manually Table 6 Changeover Set Points Single Enthalpy Btu Ib Differential Temperature F Not Adjustable Differential Enthalpy CO SP PPM MECH CLG LOCKOUT ECON SP MIN POS Btu Ib Not Adjustable Field installed accessory TO POWER EXHAUST CONTROLLER LEGEND COM Common DAT Discharge Air Thermistor DM Damper Motor GND Ground OAH Outdoor Air Enthalpy Sensor OAT Outdoor Air Temperature Sensor POT Potentiometer RAH Return Air Enthalpy Sensor RAT Return Air Temperature Sensor REM Remote i Remote Minimum OAT sensor shipped with economizer option OAH RAT RAH and CO are field installed accessories Fig 23 Typical EconoMi er Wiring j H Ventilation Air Minimum Position Set Up If ventilation air is not required skip this section If ventila tion air is required perform the following 1 The indoor fan must be on to set the ventilation air Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit connection board Locate the minimum position MI N POS potentiome ter Turn the potentiometer full CCW to fully close the outdoor air dampers Turn the potentiometer gradually clockwise CW to the desired position See Fig 16 Replace the filter access panel See Fig 18 Ensure the filter access panel is securely engaged Calculate the minimum airflow across
25. suction and discharge pressure levels should now move totheir normal start up levels NOTE When compressors are rotating in the wrong direc tion the unit will have increased noise levels and will not provide heating and cooling After a few minutes of reverse operation the scroll compres sor internal overload protection will open which will acti vate the unit s lockout and requires a manual reset Reset is accomplished by turning the thermostat on and off V INTERNAL WIRING Check all electrical connections in unit control boxes tighten as required VI CRANKCASE HEATERS Heaters are energized as long as there is power to unit and compressor is not operating IMPORTANT Unit power must be on for 24 hours prior to start up Otherwise damage to compressor may result VII EVAPORATOR FAN Fan belt and variable pulleys are factory installed Remove tape from the fan pulley See Table 8 for Air Quantity Limits See Tables 9 12 for Fan Performance data Be sure that fans rotate in the proper direction See Tables 13 and 14 for Static Pressure information for accessories and options See Table 15 for fan rpm at various fan motor pulley settings See Table 16 for Evaporator Fan Motor Specifications To alter fan performance see Evaporator Fan Performance Adjustment section page 26 Table 8 Air Quantity Limits UNIT 551A MINIMUM CFM MAXIMUM CFM 155 3600 6 000 180 4500 7 500 240 6000 10 000 VIII CONDENSER FANS AND
26. the roof curb or horizontal sup ply roof curb as shown in Fig 1 Improperly applied gasket can result in air leaks and poor unit performance Roof curb must be level This is necessary to permit unit drain to function properly Unit leveling tolerance is 1 6 in per linear ft in any direction Refer to Accessory Roof Curb or Horizontal Supply Roof Curb Installation Instructions for additional information as required B Alternate Unit Support When the curb or adapter cannot be used support unit with sleepers using unit curb or adapter support area If sleepers cannot be used support long sides of unit with a minimum of 3 equally spaced 4 in x 4 in pads on each side II STEP 2 RIG AND PLACE UNIT Inspect unit for transportation damage File any claim with transportation agency Keep unit upright and do not drop Use spreader bars over unit to prevent sling or cable dam age Rollers may be used to move unit across a roof Level by using unit frame as a reference leveling tolerance is 1 1 in per linear ft in any direction See Fig 3 for addi tional information U nit weight is shown in Table 1 Four lifting holes are provided in ends of unit base rails as shown in Fig 3 Refer to rigging instructions on unit A Positioning Provide clearance around and above unit for airflow safety and service access Fig 4 and 5 Do not install unit in an indoor location Do not locate air inlets near exhaust vents or other s
27. 4 in roof curb IIL STEP 3 FIELD FABRICATE DUCTWORK Secure all ducts to building structure U se flexible duct con nectors between unit and ducts as required Insulate and weatherproof all external ductwork joints and roof openings with counter flashing and mastic in accordance with applica ble codes Ducts passing through an unconditioned space must be insu lated and covered with a vapor barrier The 551A units with electric heat require a 1 in clearance for the first 24 in of ductwork Outlet grilles must not lie directly below unit discharge NOTE A 90 degree elbow must be provided in the ductwork to comply with UL Underwriters Laboratories codes for use with electric heat N WARNING For vertical supply and return units tools or parts could drop into ductwork and cause an injury Install a 90 degree turn in the return ductwork between the unit and the conditioned space If a 90 degree elbow cannot be installed then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space Due to electric heater supply duct will require 90 degree elbow EVAPORATOR FAN MOTOR NOTE Do not drill in this area as damage to basepan may result in water leak Fig 6 Air Distribution Thru the Bottom 551A180 and 240 Shown AIROUT AIR IN NOTE Do not drill in this area as damage to basepan may result in water leak AIROUT Fig 7
28. 61 15V RED PNK CLG2 RAT COM EC CONTROLLER RAH ACCESSORY 15V SEE WIRING DM M DIAGRAM SHEET 1 C02 COM B1 DAT VIO YEL Y1 COM PNK DAT WHT v2 REM POT BLK G COM AO LED com COM 0000 02600360 CLO 1 CLO 2 Fig 36 Typical Wiring Schematic 551A180 460v Shown cont COMPONENT ARRANGEMENI o Doa 3 2 Mm 402 3 ELt COM 1208 TRANI fu B e e e3 1 230 460 62 EQUIP GND Fig 37 Typical Component Arrangement 5514180 Shown Mac Am ECONOMI ER OPTION ACCESSORY D 24 vac OAT E ouo ride I LU 24 com com E FIELD POWER WIRING FIELD CONTROL WIRING U 6ND OAH E EC 2 111 C CL61 asy E ACCESSORY DISCONNECT PER tee EU cte RAT D ONLY BRN RES COMP PLI R SAN 182 O CONTROLLER bis L o RH E DAT 000 Ll Ll 5v T1 9 6 2 Ton Ze Vela real 182 B eger 02480 3 02 COM 1 DM
29. 71 3 457 Determine maximum deviation from average voltage AB 457 452 5 v BC 464 457 7 v AC 457 455 2 v Maximum deviation is 7 v Determine percent voltage imbalance Percentage of Voltage mbalance 100 x 1 53 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 2 contact your local electric utility company immediately Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components B Field Control Wiring Install a Bryant approved accessory thermostat assembly according to the installation instructions included with the accessory L ocate thermostat assembly on a solid wall in the conditioned space to sense average temperature Route thermostat cable or equivalent single leads of colored wire from subbase terminals through conduit in unit to low voltage connections as shown on unit label wiring diagram andin Fig 12 NOTE For wire runs up to 50 ft use no 18 AWG American Wire Gage insulated wire 35 C minimum For 50 to 75 ft use no 16 AWG insulated wire 35 C minimum For over 75 ft use no 14 AWG insulated wire 35 C minimum All wire larger than no 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat Set heat anticipator settin
30. 72 SIS d II y ii A No 08lVISS 0 CH3MOd 01314 SE 3 Z6 nae 1 92 p 0 3 2181N33N02 VIG 8 E 3 8 S E E E 0 H 3 a EA i 092 I N i v 1 01 0 9p 5 8 9 1 Wr idis gt CANO AYOSSIDIV Mg IHOTE ISnYHX3 H3MOd4 43 13H 9181 3K08v8 ai II Z Z MIA 28 f EFLI 997 Zon 91 2 E 0 III 8 E z81 8 9 1 5 v 0 i EE EGIS Laat d IOsp BEE VF E S L 49178 IA Sy o i RET 159 I lt 91 S 0l gt 2 3dIS uv4 SS399Y X 8 8 1 W E Sa SNINAdO uaa xs nr ay 27 55322V sual dol Il 480 xog TOWINO d gun NAHL SE 92 Ms 0 3 OIMIN3ONOO VIO 8 E 3 E 3 u3Nu02 SNIN3dO u3 1W0NO23 E181 62 E VINO CEOE B E 11 S L 8 1 E 0 91 s Mail CNNOD Sy9 ANI NAHL 19 3MOd IBID ZZ 3 i I Ap2 gun NAHL ZZ E OANA E MM 0 3 2IHIN3ONOO VIG 8 2 3 LE 19 2 0 Ls 310H VIG 8 2 Y gt amp y 0 0D i 19 e9U 91119919 yum paddinba syun 104 961eyosip jun ay mojaq Is G6D Y 1 ysomyonp Ajddns oui uo pallelsu aq 1snui moqj 1B p 06 V OL gz P E 27 0 Z tZ Ssirejop uondo eorues JO 26 00Sr LOG Bulmeip ses 6 8 1 11 0 5 917 0 abpe dup 1 Ao2 do 10 apis HF 4 Z 1 uoee uo g 9 s 0 wo v Isod 1euJoo JO SPISINO WO e1e suoisueullq 8 ANO AB055322 i eoueJeo o ou seJmboeJ epeouueq ISNYHX3 H3MOd I JO BOUd jqeaow e 9 DION UI pas se 1sneux Jamod Jaduiep s z z I ay pue oo Jesuepuoo eui JO eouejeog jo uondeoxe eui yM Z I leAeid Aew uonoipsunf 10 sepoo
31. 84T 213T Fan Rpm Range Low Medium Static 834 1064 873 1021 1002 1151 High Static 1161 1426 1025 1200 1193 1369 Motor Bearing Type Ball Ball Ball Maximum Allowable Rpm 1 550 1 550 1 550 Motor Pulley Pitch Dia Low Medium Static 1 4 4 9 5 9 5 4 6 6 High Static 7 4 4 9 5 9 5 4 6 6 Nominal Motor Shaft Diameter in 7 Fan Pulley Pitch Diameter in Low Medium Static High Static Nominal Fan Shaft Diameter in Belt Quantity Type Length in Low Medium Static High Static Pulley Center Line Distance in Speed Change per Full Turn of Movable Low Medium Static Pulley Flange Rpm High Static Movable Pulley Maximum Full Turns From Closed Position Factory Speed Factory Speed Setting Rpm Low Medium Static High Static HIGH PRESSURE SWITCH psig Cutout Reset Auto LOW PRESSURE SWITCH psig Cutout Reset Auto FREEZE PROTECTION THERMOSTAT F Opens Closes OUTDOOR AIR INLET SCREENS Cleanable E it 2 20 x 25 x 1 Quantity Size in 1220 x 20x 1 RETURN AIR FILTERS Throwaway A AA 4 20 x 20 x 2 Quantity Size in 4 16 x20x2 LEGEND Circuit 1 uses the lower portion of condenser coil and lower portion of evapora Al Aluminum tor coils and Circuit 2 uses the upper portion of both coils Bhp Brake Horsepower TTDue to belt and pulley style pulley cannot be set from 0 to 11 5 turns open Cu Copper TXV Thermostatic Expansion Valve Evaporator coil fin material condenser coil fin material TWeight of 1
32. ECTION O VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED FOR 24 HOURS pqoddodo Li Il START UP ELECTRICAL SUPPLY VOLTAGE L1 L2 L2 L3 L3 L1 COMPRESSOR AMPS COMPRESSOR NO 1 L1 L2 L3 COMPRESSOR NO 2 L1 L2 L3 SUPPLY FAN AMPS EXHAUST FAN AMPS ELECTRIC HEAT AMPS IF SO EOUIPPED L1 L2 L31 TEMPERATURES OUTDOOR AIR TEMPERATURE F DB Dry Bulb RETURN AIR TEMPERATURE F DB F WB Wet Bulb COOLING SUPPLY AIR F ELECTRIC HEAT SUPPLY AIR IF SO EQUIPPED F PRESSURES REFRIGERANT SUCTION CIRCUIT NO 1 PSIG CIRCUIT NO 2 PSIG REFRIGERANT DISCHARGE CIRCUIT NO 1 PSIG CIRCUIT NO 2 PSIG O VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 29 GENERAL O ECONOMI ER MINIMUM VENT AND CHANGEOVER SETTINGS TO J OB REQUIREMENTS O VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES Copyright 2001 Bryant Heating amp Cooling Systems CL 1 CATALOG NO 5355 105 CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE
33. HY312 V3uY SIHL d333 er W35N30N02 NIVHO 31V5N30NOO I i y QN3 ONIN3d0 ATddNS 438 ky a 4 5881 u35N3QN02 8 9 91 9 gyno gun 9NIN3dO 9NIN3dO aes NHA138 A lddnS UMOUS se payoyd eq luo ued yun uonoes JOOPU 9y uonel eisu uil Jo ued uep ay ui dn piinq Jayem jueuDejs jo prezey ay jue eJd ol 3 LON Jo qunO uunjed si 1e u 91119919 yum paddinba syun 40J Biguosip yun ay mojaq aa F pue iddns epis yom np iddns ey uo p lle1su ag jsnu moqj 1B p 06 V LINA JO SNITLNO 64D uoneleisu ufi RS 99 0vA eB 91 quno jooy Sun 4004 40 MIIA NYd xa 2 1 01 5 1 ji mole JO uoll59 i1id aq si l uulllltu u ase u suoisu uuiq lsuep q 1 pajeos auasdoau potui Sjeued paje nsul p lquu ssesip peddius s 40sseooe gun Jooy SALON roic Y OG Bunmbay sliun 101 qun prepuejs qno piepuels NOILdIHIS30 EVAPORATOR FAN MOTOR 551A155 EVAPORATOR FAN MOTOR 551A180 240 25 VENT AIR ECONOMIZER HOOD AIR IN BLOCK OFF PAN 41 2 HORIZONTAL SUPPLY CURB CRRFCURBO 12A00 OR HORIZONTAL ADAPTER ROOF CURB CRRFCURBO13A00 TRANSITION DUCT NOTE For preassembled horizontal adapter roof curb part no CRRFCURBO13A00 the accessory kit includes a factory designed high static regain transition duct For horizontal curb part no CRRFCURBO 124A00 a field supplied transition duct is required Fig 2 Horizontal Supply Roof Curb and H
34. NE 100 CAMCN OOO 5 3 T FIELD POWER SUPPLY 5L3 3L2 1L1 LINE UNIT WIRING d 7 1 3 s 200 BLK YEL BLU oo To Ye AMP 5 o o o LOAD UNIT POWER NA AL a NON FUSED DISCONNECT n 3 e E a a lo mE 2 4 5 AMP FIELD POWER SUPPLY NOTE The disconnect takes the place of TB 1 as shown on the unit wiring diagram label and the component arrangement label Fig 13 Optional Non Fused Disconnect Wiring VII STEP 7 MAKE OUTDOOR AIR INLET ADJUSTMENTS A Manual Outdoor Air Damper All units except those equipped with a factory installed economizer have a manual outdoor air damper to provide ventilation air Damper can be preset to admit up to 25 out door air into return air compartment To adjust loosen securing screws and move damper to desired setting Then retighten screws to secure damper Fig 14 B Optional EconoMi er EconoMi er Motor Control Module Fig 15 17 Set the ECONSP dial to the D setting Fig 16 The control module is located on the EconoMi er motor See Fig 15 and 17 Damper Vent Position Setting 1 Set fan switch at ON position continuous fan opera tion and close night switch if used 2 Set system selector switch to OFF position 3 Turn Min Pos dial slowly until dampers assume desired vent position Do not manually operate EconoMi er motor since damage to motor will result 25 ADJUSTABLE AIR DAMPER BASE UNIT SECURING SCREWS Fig 14 25 O
35. NFIG to help troubleshoot the system See Fig 16 The button can perform 3 different functions Pressing the CONFIG button for more than three seconds but less than ten seconds and then releasing will start the automatic test procedure The damper will modulate fully open wait and modulate dosed This process takes three minutes to complete Use this feature to determine if the actuator can be commanded If the CONFIG button is pressed and held for ten seconds and less than 30 seconds then released the EconoMi er con troller reconfigures its mode of operation based on the sen sors that are connected and functioning normally and cancels the automatic test procedure If the EconoMi er controller recognized a non critical sensor fault and flashed a code i e FLASH 6 outdoor air humidity sensor fault the FLASH CODE will be deared and normal operation begins Ensure faulty sensor is removed before clearing faults If the EconoMi er controller recognizes a critical sensor fault and flashes a code i e FLASH 4 discharge air ther mostat fault the FLASH code will not be cleared and the EconoMi er will remain in the safe operation mode The sensor fault must be corrected to enable EconoMi er to revert to normal operation Table 17 EconoMi er Control Module Flash Code Identification FLASH CODE CAUSE Constant On Normal operation Constant Off No power Continuous CONFIG button pushed and held Flash between 3 and 9 seconds
36. O SOLO ES e 2 O gt co 02 co gt DBODHOWDOD 551A240 20 TONS cont fo 0 X AO OY OV ORS Q 09 cO 02 sd 09 I NODONGA O ONO OY TOM DONDORORO On RNO 00000 fo D 00 5 91 01 O Q O GQ I O NW ENGOIN B9 OO On Available External Static Pressure in wg Cfm O00 SE C OY O10 ivooonoo 2BROIO0O0O00 1517 5793 1535 6144 LEGEND Bhp Brake Horsepower FIOP Factory Installed Option Watts Input Watts to Motor Standard low medium static drive range is 1002 to 1151 rpm Alternate high static drive range is 1193 to 1369 Other rpms require a field supplied drive NOTES 1 Maximum continuous bhp for the standard motor is 9 47 for 208 v units and 10 33 for 230 and 460 v units The maximum continu ous watts is 7915 for 208 v units and 8640 for 230 and 460 v units Do not adjust motor rpm such that motor maximum bhp and or watts is exceeded at the maximum operating cfm 3 Static pressure losses i e EconoMi er must be added to exter nal static pressure before entering Fan a table Interpolation is permissible Do not extrapolate Fan performance is based on wet coils clean filters and casing losses See Table 13 for accessory FIOP static pressure information Extensive motor and drive testing on these units ensures that the full bhp and watts range of the motor can be utilized with confi dence Using your fan motors up to the watts
37. On and Minimum Off which are accomplished by the strategies below 1 If Y1 is energized and the room thermostat calls for Y2 2 stage thermostat the compressor and OF C are energized The position of the EconoMi er damper is maintained at its current value 2 If Y1 is energized for more than 20 minutes and Y2 is not energized whether or not a 2 stage thermostat is used the compressor and OFC are energized The position of the EconoMi er damper is maintained at its current value 3 If Y1 is energized and compressor no 1 is already energized see Step 2 and the room thermostat calls for Y2 compressor no 1 continues to operate If Y 2 remains energized for more than 20 minutes com pressor no 2 is energized NOTE Compressor no 2 cannot be energized unless there is a signal for Y 2 from the space thermostat 4 If compressor no 2 is energized and the Y2 signal from the thermostat is satisfied compressors 1 and 2 are deenergized Re asserting Y2 will start compres sor no 1 and after a 20 minute interstage delay compressor no 2 5 If compressor no 1 is energized and the thermostat is satisfied compressor no 1 the OFM and IFM are deenergized and the EconoMi er modulates closed When the OAT is below the MECH CLG LOCKOUT set point the compressors remain off D Freeze Protection Thermostat s A freeze protection thermostat FPT is located on the top and bottom of the evaporator coil It detects frost
38. RAIN HOLE Fig 9 Condensate Drain Details 5514155 Shown 3 4 FPT DRAIN CONNECTION HALF COUPLING 2 IN FIELD SUPPLIED NIPPLE BASE RAIL 8 1 2 IN FIELD SUPPLIED NIPPLE Fig 10 Condensate Drain Piping Details VI STEP 6 MAKE ELECTRICAL CONNECTIONS A Field Power Supply Unit is factory wired for voltage shown on nameplate When installing units provide a disconnect per NEC National Electrical Code requirements of adequate size Table 2 Electrical heater data is shown in Table 3 All field wiring must comply with NEC and local require ments Route power lines through control box access panel or unit basepan Fig 4 and 5 to connections as shown on unit wir ing diagram and Fig 11 Operating voltage to compressor must be within voltage range indicated on unit nameplate On 3 phase units volt ages between phases must be balanced within 2 and the current must be balanced within 10 N CAUTION The correct power phasing is critical in the operation of the scroll compressors An incorrect phasing will cause the compressor to rotate in the wrong direction This may lead to premature compres sor failure Use the following formula to determine the percentage of voltage imbalance Percentage of Voltage Imbalance 100 x Mex voltage deviation from average voltage average voltage A B C Supply voltage is 460 3 60 AB 452 v BC 464 v AC 455 v Average Voltage e 13
39. ailure Unit warranty will not be affected Use of a field supplied motor may affect wiring size Contact your Bryant representative for details Table 11 Fan Performance 551A180 551A180 15 TONS Available External Static Pressure in wg Cfm gt O gt S J 02 O1 2 0102 4 I O N O N G SISMO IN ea NRONAZ OSO Y IO 65 RO 00 On N F GO POOON MIN Sin a 551A180 15 TONS cont BROWWONNNa2 P gt O 000 O 09 09 e gt a O co GQ GO BBRROOONNNYv 00 gt N gt 00 w o S SO ION E ENN One O Q Q S N IS B2 00 gt d P O gt N G G Q O O Q O Q S O Available External Static Pressure in wg Cfm Q OY On gt P gt cO cO O CO O1 00 00 N O 00 O 00 O 0 53 00 Q 2 50 2 72 2 96 3 49 3 79 4 11 4 45 4 81 5 20 5 61 HOLE P CO 09 09 to Q 00 O co A NANO a 00 0 QOO gt gt P OQ C CO OQ1 00 gt O 02 O1O1 Y O JO O1 5 551A180 15 TONS cont Available External Static Pressure SS wg Cfm LEGEND Bhp Brake Horsepower FIOP Factory Installed Option Watts Input Watts to Motor Standard low medium static drive range is 873 to 1021 rpm Alternate high static drive range is 1025 to 1200 Other rpms require a field supplied drive NOTES 1 Maximum continuous bhp for the standard motor is 6 13 The max imum contin
40. bels attached to the unit and other safety precautions that may apply Follow all safety codes Wear safety glasses and work gloves Use quenching doth for unbrazing operations Have fire extinguishers available for all brazing operations N WARNING Before performing service or mainte nance operations on unit turn off main power switch to unit Electrical shock could cause personal injury IMPORTANT Units have high ambient operating limits If limits are exceeded the unit will automatically lock the com pressor out of operation Manual reset will be required to restart the compressor installation start up and service instructions SINGLE PACKAGE ROOFTOP ELECTRIC COOLING ELECTRIC HEATING UNITS 551A DuraPac Plus Series Sizes 155 240 Cancels II 551A 155 2 II 551A 155 3 3 1 01 INSTALLATION I STEP 1 PROVIDE UNIT SUPPORT A Roof Curb Assemble and install accessory roof curb or horizontal supply roof curb in accordance with instructions shipped with the accessory Accessory roof curb and horizontal supply roof curb and information required to field fabricate a roof curb or horizontal supply roof curb are shown in Fig 1 and 2 Install insulation cant strips roofing and counter flashing as shown Ductwork can be secured to roof curb before unit is set in place IMPORTANT The gasketing of the unit to the roof curb or horizontal supply roof curb is critical for a leakproof seal Install gasket supplied with
41. correct trouble Determine the cause and correct it before resetting the breaker C Condenser Fan Motor Protection Each condenser fan motor is internally protected against overtemperature D High and Low Pressure Switches If either switch trips or if the compressor overtemperature switch activates that refrigerant circuit will be automati cally locked out by the CLO To reset manually move the thermostat setting 29 E Freeze Protection Thermostat FPT An FPT is located on the top and bottom of the evaporator coil It detects frost build up and turns off the compressor allowing the coil to clear Once the frost has melted the com pressor can be reenergized XII RELIEF DEVICES All units have relief devices to protect against damage from excessive pressures e g fire These devices protect the high and low side XIII CONTROL CIRCUIT 24 V This control circuit is protected against overcurrent by a 3 2 amp circuit breaker Breaker can be reset If it trips determine cause of trouble before resetting See Fig 36 and 37 XIV REPLACEMENT PARTS A complete list of replacement parts may be obtained from any Bryant distributor upon request XV ECONOMISER LEDs The EconoMi er control module has LEDs for diagnostic purposes The flash code identification is shown in Table 17 XVI OPTIONAL HINGED ACCESS DOORS When the optional service package is ordered or the if the hinged access doors option is or
42. ctions and remove the 4 mounting bolts 11 Remove the motor 12 Toi install the new motor reverse Steps 1 11 CENTER POST MOTOR PULLEY SLIDING MOTOR MOTOR H n PLATE MOTOR SUPPORT CHANNEL JACKING BOLT NOTE A 31 2 in bolt and threaded plate are included in the installer s packet They should be added to the motor support channel below the motor mounting plate to aid in raising the motor The plate part number is 50DP503842 The adjustment bolt is 3 g 16 x 21 2 LG Fig 32 551A180 240 Evaporator Fan Motor Section V BELT TENSION ADJUSTMENT To adjust belt tension 1 Loosen fan motor bolts 2 Adjust belt tension a Size 155 Units M ove motor mounting plate up or down for proper belt tension 4 2 in deflection with one finger b Size 180 240 Units Turn motor jacking bolt to move motor mounting plate up or down for proper belt tension 3 3 in deflection at midspan with one finger 9 Ib force 3 Tighten nuts 4 Adjust bolts and nut on mounting plate to secure motor in fixed position 27 VI CONDENSER FAN ADJUSTMENT A 551A155 and 180 Units Fig 33 1 Shut off unit power supply 2 Remove access panel s closest to the fan to be adjusted 3 Loosen fan hub setscrews 4 Adjust fan height on shaft using a straightedge placed across the fan orifice 5 Tighten setscrews and replace panel s 6 Turn on unit power B 551A240 Units Fig 34 1 Shut off unit power supply
43. d Amps Heater capacity kW is based on heater voltage of 208 v 240 v and 480 v Heaters are rated at 240 v or 480 v If power distribution volt age to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker Heaters are field installed only NOTES 1 In compliance with NEC requirements for multimotor and combina tion load equipment refer to NEC Articles 430 and 440 the overcur rent protective device for the unit shall be fuse or HACR breaker Canadian units may be fuse or circuit breaker 2 Unbalanced 3 Phase Supply Voltage Never operate a motor where a phase imbalance in supply voltage is greater than 2 Use the following formula to determine the percent of voltage imbalance 96 Voltage Imbalance 100 x max voltage deviation from average voltage average voltage Example Supply voltage is 460 3 60 A B C AB 452 v BC 464 v DE AC 455 v Va Average Voltage LS 1371 3 457 Determine maximum deviation from average voltage AB 457 4522 5v BC 464 457 2 7 v AC 457 455 2 2v Maximum deviation is 7 v Determine percent of voltage uus Voltage Imbalance 100 x 1 53 This amount of phase imbalance is satisfactory as it is below the maxi mum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 2 contact your local electric utility company immediately 3 MCA calculation for units with electric heaters o
44. dered the unit will be pro vided with external and internal hinged access doors to facil itate service Four external hinged access doors are provided All external doors are provided with 2 large 1 a turn latches with folding bail type handles Compressor access doors have one latch A single door is provided for filter and drive access One door is provided for control box access The control box access door is interlocked with the non fused disconnect which must be in the OFF position to open the door Two doors are provided for access to the compressor compartment Two internal access doors are provided inside the filter drive access door T he filter access door on the left is secured by 2 small 1 4 turn latches with folding bail type handles This door must be opened prior to opening the drive access door The drive access door is shipped with 2 sheet metal screws holding the door dlosed Upon initial opening of the docr these screws may be removed and discarded The door is then held shut by the filter access door which closes over it LEGEND AND NOTES FOR FIG 36 AND 37 LEGEND AHA Adjustable Heat Anticipator HC Heater Contactor TB Terminal Block BRK W AT Breaks with Amp Turns HPS High Pressure Switch TC Thermostat Cooling C Contactor Compressor HTR Heater TH Thermostat Heating CAP Capacitor Ese oo Fan o TRAN Transformer CB Circuit Breaker Indoor Fan Circuit Brea
45. e a liquid pressure psig and temperature at a point between the condenser coil and the subcooler coil A tap is provided on the unit to measure liquid pressure entering the sub cooler leaving the condenser X FILTER DRIER Replace whenever refrigerant system is exposed to atmosphere XI PROTECTIVE DEVICES A Compressor Protection Overtemperature Each compressor has an internal protector to protect it against excessively high discharge gas temperatures Overcurrent Each compressor has internal line break motor protection Crankcase H eater All units are equipped with a 70 watt crankcase heater to prevent absorption of liquid refrigerant by oil in the crank case when the compressor is idle The crankcase heater is energized whenever there is a main power to the unit and the compressor is not energized IMPORTANT After prolonged shutdown or servicing ener gize the crankcase heaters for 24 hours before starting the compressors Compressor Lockout If any of the safeties high pressure low pressure freeze protection thermostat compressor internal thermostat trip or if thereis loss of power to the compressors the CLO com pressor lockout will lock the compressors off To reset man ually move the thermostat setting B Evaporator Fan Motor Protection A manual reset calibrated trip magnetic circuit breaker protects against overcurrent Do not bypass connections or increase the size of the breaker to
46. ehind lower fil ter retainer and tighten screws 5 Loosen sheet metal screws for base unit top panel located above outdoor air inlet opening and remove screws for hood side panels located on the sides of the outdoor air inlet opening 6 Match notches in hood top panel to unit top panel screws Insert hood flange between unit top panel flange and unit Tighten screws 7 Hold hood side panel flanges flat against unit and install screws removed in Step 5 8 Insert outdoor air inlet screens and spacer in channel created by lower filter retainer and filter support bracket 9 Attach remaining short section of filter support bracket A Outdoor Air Enthalpy Sensor Installation Perform the following procedure to install the outdoor air enthalpy sensor part no CROUTENTOO1AO00 1 Remove the outdoor air temperature sensor cover See Fig 21 Save cover and screws 2 Disconnect the wiring from the installed outdoor air temperature sensor See Fig 22 3 Usea l 4 in nut driver to remove the 2 screws secur ing the outdoor air temperature sensor to the sheet metal 4 Mount the outdoor air enthalpy sensor in the outdoor air temperature sensor location using the screws removed in Step 3 5 Connect the outdoor air enthalpy sensor wiring har ness to the EconoMi er control module and sensor 6 Reinstall sensor cover saved from Step 1 B Return Air Temperature Sensor or Return Air Enthalpy Sensor Installation Perform the
47. en the suction pressure reaches 60 psig The sub cooler control low pressure switch is an added safety device to protect against evaporator coil freeze up during low ambi ent operation The subcooler control low pressure switch will only deactivate the 3 way liquid line solenoid valve in the Perfect Humidity circuit The compressors will continue to run as long as there is a call for cooling regardless of the position of the subcooler control low pressure switch The 3 way solenoid valve and the Perfect Humidity package will be reactivated only when the call for cooling has been satis fied the subcooler control low pressure switch has closed above 80 psig and a new call for cooling exists The crank case heaters on the scroll compressors provide additional protection for the compressors due to the additional refriger ant charge in the subcooler When the humidistat is satisfied the humidistat internal switch opens cutting power to and deenergizing the LLSVs The refrigerant is routed back through the evaporators and the subcooler coils are removed from the refrigerant loops When the thermostat is satisfied C1 and C2 are deenergized and the compressors FM and OF Ms shut off If the thermo stat fan selector switch is in the ON position the IFM will run continuously 19 Table 9 Fan Performance 551A155 With Standard Indoor Fan Motor 551A155 12 TONS Available External Static Pressure in wg Cfm
48. gs as indicated in Table 4 Settings may be changed slightly to provide a greater degree of com fort for a particular installation mas I I ELO I POWER ane am am m a am s ggl SUPPLY 22 m asa oe cl gui la I Y 2 I EQUIP GND Ec TB1 MAXIMUM WIRE SIZE UNIT VOLTAGE 551A 208 230 460 Fo AN 350 kcmil 2 0 LEGEND EQUIP Equipment NEC National Electrical GND Ground Code kcmil Thousand Circular TB Terminal Block Mils Fig 11 Field Power Wiring Connections THERMOSTAT ASSEMBLY REMOVABLE JUMPER UNIT LOW VOLTAGE CONNECTIONS Fig 12 Field Control Thermostat Wiring 8 Table 2 Electrical Data NOMINAL ELECTRIC POWER abh HEAT SUPPLY 60 Hz A CA MOCPT 59 59 70 70 64 63 80 80 14 19 39 45 60 67 70 70 6 188 14 19 39 45 66 73 80 80 208 2 i 09 230 26 34 71 82 100 113 100 125 i 26 34 71 82 106 119 110 125 117 135 157 146 175 175 j 163 151 117 135 4 61 61 80 80 4 E 65 66 80 80 14 19 39 45 62 70 80 80 208 230 k 18 8 14 19 39 45 68 76 80 80 26 34 71 82 102 116 110 125 3 18 8 26 34 71 82 108 122 110 125 42 56 117 135 159 149 175 175 i 18 8 42 56 117 135 165 155 175 175 6 26 34 71 82 109 122 110 125 208 230 x i 3 18 8 26 34 71 82 114 128 125 150
49. idistat Wiring Schematic 460V Unit Shown START UP Use the following information and Start Up Checklist on page CL 1 to check out unit PRIOR to start up I UNIT PREPARATION Check that unit has been installed in accordance with these installation instructions and all applicable codes Il COMPRESSOR MOUNTING Compressors are internally spring mounted Do not loosen or remove compressor holddown bolts Ill REFRIGERANT SERVICE PORTS Each refrigerant system has a total of 3 Schrader type service gage ports One port is located on the suction line one on the compressor discharge line and one on the liquid line In addi tion Schrader type valves are located underneath the low pressure switches Be sure that caps on the ports aretight IV COMPRESSOR ROTATION It is important to be certain the compressors are rotating in the proper direction To determine whether or not compres sors are rotating in the proper direction 1 Connect service gages to suction and discharge pres sure fittings 2 Energizethe compressor 3 The suction pressure should drop and the discharge pressure should rise as is normal on any start up If the suction pressure does not drop and the discharge pres sure does not rise to normal levels 1 Notethat the evaporator fan is probably also rotating in the wrong direction 2 Turn off power tothe unit 3 Reverse any two of the incoming power leads 4 Turn on power to the compressor The
50. in accessory kit Existing motor is not Motormaster Il compatible Install M otormaster III Controls Only one Motormaster Il control is required per unit Sensor Install the sensor for thermistor input control in the location shown in Fig 26 Connect sensor leads to the purple and grey control signal leads on the Motormaster 111 control Signal Selection Switch Remove the cover of the Motor master III control Set the switch to accept the thermistor sensor input signal Set the frequency to match the unit power supply 60 Hz Motormaster 111 Control Recommended mounting location is beneath the control box mounted tothe partition that sep arates the control box section from the indoor section WIND BAFFLE 14 356 MIN CROSS BREAK BAFFLE TOP VIEW 4 95 MIN I Le sot 2082 80 wJ 40 254 TYP 10 254 aP 15 381 TYP 3 4 19 TYP F 1 25 MIN BAFFLE FRONT VIEW NOTE Dimensions in are in mm Fig 25 Wind Baffle Details NOTE If unit power is supplied through the roof curb and basepan of the unit mount the Motormaster III control on the corner post adjacent to the conduit running from the basepan to the bottom of the control box X STEP 10 INSTALL HUMIDISTAT FOR OPTIONAL PER FECT HUMIDITY DEHUMIDIFICATION PACKAGE Perfect Humidity dehumidification package operation can be controlled by field installation of a Bryant
51. ker 1 cc Cooling Compensator IFM Indoor Fan Motor lt gt Terminal Marked CH Crankcase Heater IFR Indoor Fan Relay O Terminal Unmarked CLO Compressor Lockout hee me T COMP Compressor Motor Low u WI CR I Cobttol Relay LS Limit Switch Terminal Block DAT Discharge Air Thermistor NEC National Electrical Code Spli DM Damper Motor OAT Outdoor Air Thermostat e plice DU Dummy Terminal OFC Outdoor Fan Contactor EC Enthalpy Control OFM Outdoor Fan Motor Factory Wiring EQUIP Equipment OP Overcurrent Protection Field Wiring FL Fuse Link Ri Pda Y Option Accessory Wiring FPT Freeze Protection Thermostat L n FU Fuse QT Quadruple Terminal To indicate common potential GND Ground SW Switch only not to represent wiring NOTES 1 Compressor and or fan motor s thermally protected 3 phase motors protected against primary single phasing conditions If any of the original wire furnished must be replaced it must be replaced with type 90 C wire or its equivalent Jumpers are omitted when unit is equipped with EconoMi er IFCB must trip amps is equal to or less than 140 FLA The CLO locks out the compressor to prevent short cycling on compressor over load and safety devices Before replacing CLO check these devices N OOo N Number s indicates the line location of used contacts A bracket over 2 numbers sig
52. lty TXV 1 Check TXV bulb mounting and secure tightly to suction line 2 Replace TXV if stuck open or closed Recover refrigerant evacuate system and recharge Condenser air restricted or air short cycling Determine cause and correct Low refrigerant charge Check for leaks repair and recharge Restriction in liguid tube High heat load Check for source and eliminate Faulty TXV 1 Check TXV bulb mounting and secure tightly to suction line 2 Replace TXV if stuck open or closed Refrigerant overcharged Dirty air filter Replace filter Low refrigerant charge Check for leaks repair and recharge Metering device or low side restricted Remove source of restriction Faulty TXV 1 Check TXV bulb mounting and secure tightly to suction line 2 Replace TXV if stuck open or closed Insufficient evaporator airflow Increase air quantity Check filter and replace if necessary Temperature too low in conditioned area Reset thermostat Field installed filter drier restricted TXV Thermostatic Expansion Valve 33 Table 19 EconoMi er Troubleshooting PROBLEM POTENTIAL CAUSE REMEDY Damper Does Not Indoor Evaporator Fan is Check to ensure that 24 vac is present at Terminal C1 Common Power Open Off on the IFC Indoor Evaporator Fan Contactor or that 24 vac is present at the IFO Indoor Evaporator Fan On terminal Check whether 24 vac is present at PL6 1 red wire and or PL6 3 black wire If 24 vac is
53. mpressor should then be run for 10 minutes shut down and the access valve opened until no oil flows This should be repeated twice to make sure the proper oil level has been achieved B Fan Shaft Bearings For size 155 units bearings are permanently lubricated No field lubrication is required For size 180 and 240 units the bearings are of the pillow block type and have grease fit tings The bearing opposite the motor end has an extended tube line so it can be lubricated from the motor side Lubri cate the bearings twice annually Typical lubricants are given below MANUFACTURER LUBRICANT Texaco Regal AFB 2 Mobil Mobilplex EP No 1 Sunoco Texaco Prestige 42 Multifak 2 Preferred lubricant because it contains rust and oxidation inhibitors C Condenser and Evaporator Fan Motor Bearings The condenser and evaporator fan motors have permanently sealed bearings so no field lubrication is necessary Ill EVAPORATOR FAN PERFORMANCE ADJUSTMENT Fig 30 32 Fan motor pulleys are factory set for speed shown in Table 1 To change fan speeds 1 Shut off unit power supply 2 a Size 155 Only Loosen belt by loosening fan motor mounting plate nuts b Size 180 and 240 Only Loosen nuts on the 2 car riage bolts in the motor mounting base Install jacking bolt and plate under motor base bolt and plate are shipped in installer s packet See Fig 32 Using bolt and plate raise motor to top of slide and remove bel
54. n EconoMi er Changeover Set at correct value See Table 6 Set Point Set Too High or Too Low Discharge Air If STATUS light is flashing 4 flashes Discharge Air Thermistor is Thermistor Faulty faulty Check wiring or replace sensor Outdoor Air Temperature If STATUS light is flashing 5 flashes Outdoor Air Temperature Sensor is Sensor Faulty faulty Check wiring or replace sensor Damper Position Supply Air Low Limit The supply air temperature is less than 45 F causing the minimum Less than Minimum Strategy Controlling position to be decreased Refer to the Start Up instructions Verify correct Position Set Point setting of MIN POS If correct EconoMi er is operating correctly Damper Does Not CO Ventilation Strategy If a COo sensor is being used and the damper position is greater than Return to Minimum Controlling minimum position the ventilation control strategy is controlling Refer to Position the Start Up instructions EconoMi er is operating correctly Damper Does Not Damper Travel is Check to ensure the damper is not blocked Close on Power Loss Restricted LEGEND IFM _ Indoor Fan Motor PL Plug Table 20 Perfect Humidity Dehumidification Subcooler Service Analysis Subcooler will not energize No power to subcooler Check power source Ensure all wire connections control transformer are tight No power from subcooler control transformer 1 Fuse open check fuse Ensure continuity of wiring to liquid line three
55. nifies a single pole double throw contact An underlined number signifies a normally closed contact Plain no line number signifies a normally open contact un m 20 22 M ELECTRIC HEAT OPTION EE ELESTR IG HC2 FL o 5 z I op HC2 o to ww HTR2 T I ie ELECTRIC HEAT Fud A Hei FL ak I 1 480V 480V oe He Eu AMPS KW FL w I HC2 I y A 39 32 4 oss HTR2 55 1 I oP Hc3 8 66 55 w FL C 96 79 8 Lu 3 HC3 d I HTR3 HC2 oo 4 I FL vel a Hc ak I HTR1 l P HC4 OF i a I FL VA 8 04 I HC4 i HTR4 HC1 FL va Ls TB2 iT ORN ERN C TB2 Ls B ONLY 82 mH vio or I A amp C ONLY I amp U alk H cor YEL a BLK HKT ax T I 4 YEL 4234 HID YEL 2 come p YEL E Bu 34Hi3 Em 3 gt c2 cLo2 FIELD em gn BLK GHI ax 07 TN ES PONER 12 Ba eL HKB ve uu compez 460 3 60 zc ES SUPPLY w 3 23 BLU 4234 H13 BLU 3 181 is IFCB IFC z EQUIP GND Lark Daz BLK HKD BLK ee aK YEL
56. not present check wiring see unit label diagram Check proper thermostat connection to G on the connection board No Power to EconoMi er Check to ensure that 24 vac is present across Terminals 24 VAC and Controller 24 V COM on the EconoMi er control If 24 vac is not present check wiring see unit label diagram If 24 vac is present STATUS light should be on constantly No Power to G Terminal If IFM is on check to ensure 24 vac is present on G Terminal of the EconoMi er controller If 24 vac is not present check wiring see unit label diagram Controller Fault If STATUS light is flashing one flash the EconoMi er controller is experiencing a fault condition Cycle power to the controller If condition continues replace the EconoMi er controller Thermostat Fault If STATUS light is flashing two flashes the EconoMi er controller senses that the thermostat is wired incorrectly Check wiring between the thermostat and the connection board in the electrical panel The fault condition is caused by Y2 being energized before Y1 Actuator Fault Check the wiring between the EconoMi er controller and the actuator Hold CONFIG button between 3 and 10 seconds to verify the actuators operation This process takes 3 minutes to complete EconoMi er Minimum Position Set Verify that the MIN POS is set greater than zero Adjust MIN POS Operation Limited to Incorrectly to 100 to verify operation and then set to correct setting Minimum Positio
57. onal heat is needed HC2 is energized through W2 C Cooling Units With EconoMi er When the OAT is abovethe ECON SP set point and the room thermostat calls for Stage 1 cooling R to G Y 1 the indoor fan motors IFM is energized and the EconoMi er damper modulates to minimum position The compressor contactor and OFC are energized to start the compressor and outdoor fan motor OFM After the thermostat is satisfied the damper modulates to the fully dosed position when the IFM is deenergized When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling R to G Y1 the EconoMi er modulates to the minimum position when the IFM is energized The EconoMi er provides Stage 1 of cool ing by modulating the return and outdoor air dampers to maintain a 55 F supply air set point If the supply air tem perature SAT is greater than 57 F the EconoMi er modu lates open allowing a greater amount of outdoor air to enter theunit If the SAT drops below 53 F the outdoor air damper modulates closed to reduce the amount of outdoor air When the SAT is between 53 and 57 F the EconoMi er maintains its position 18 If outdoor air alone cannot satisfy the cooling requirements of the conditioned space and the OAT is above the MECH CLG LOCKOUT set point the EconoMi er integrates free cooling with mechanical cooling This is accomplished by the strategies below NOTE Compressors have a two minute Minimum
58. or bhp rating shown will not result in nuisance tripping or premature motor failure Unit warranty will not be affected Use of a field supplied motor may affect wiring size Contact your Bryant representative for details UNIT 551A HEATER RATED VOLTAGE Table 13 Accessory FIOP Static Pressure in wg ELECTRIC HEATERS PRESSURE DROP kW ECONOMI ER PRESSURE DROP 208 240 3 60 14 19 26 34 14 19 26 34 14 19 26 34 14 19 26 34 0 06 42 56 42 56 42 56 480 3 60 5 000 6 000 7 200 9 000 10 000 11 250 5 000 6 000 7 200 9 000 10 000 11 250 208 240 3 60 480 3 60 LEGEND FIOP Factory Installed Option NOTES 1 Heaters are rated at 240 v and 480 v 42 56 42 56 42 56 0 0 0 0 0 1 0 1 0 1 6 8 2 6 7 3 The static pressure must be added to external static pressure The sum and the evaporator entering air cfm should then be used in conjunction with the Fan Performance table to determine blower rpm bhp and watts 2 The factory assembled horizontal adapter substantially improves fan performance CONDENSER COIL DISCHARGE A p OUTDOOR AIR e SUBCOOLER P COIL SUCTION EQUALIZER P d A CRANKCASE LIQUID lt m E EVAPORATOR fi HEATER I bd Ee 3 WAY i ab oe VALVE COMPRESSOR l I BULB g 1 S LPS Ea SUB COOLER CONTROL E ES LOW PRESSURE SWITCH AAEE TXV x ap INDOOR AIR EQUALIZER LINE p o lt a bain hi Fig 29
59. orizontal Adapter Roof Curb 10 0 8048 SPREADER BARS DETAIL A RIGGING HOOK OTES 1 Dimensions in are in millimeters 2 Refer to Fig 4 and 5 for unit operating weights 3 Remove boards at ends of unit and runners prior to rigging 4 Rig by inserting hooks into unit base rails as shown Use corner post from packaging to protect coil from damage Use bumper boards for spreader bars 5 Weights do not include optional EconoMi er Add 80 Ib 36 kg for EconoMi er weight 6 Weights given are for aluminum evaporator and condenser coil plate fins Weights include electric heat 7 Add 75 Ib 34 kg for crating on 5514155 and 180 units Add 135 Ib 61 kg for crating on 551A240 units 8 Add 150 Ib 68 kg for copper condenser coil Add 280 Ib 127 kg for copper condenser and evaporator coils As CAUTION All panels must be in place when rigging Fig 3 Rigging Details 081 pue sSLV SS suoisueuig Hun eseg t Bld 9291 uu 01 Y V NOI123S ja 3 5 gt VE t NU als aa Un 1 ved ldd p Zon dig ig ZE L 86 Nuni3H 31vNu3l1V 21109 YOO0NI MOYA 19 i H Zk L ul a0 ee id CIOMINOD 073 via 8
60. ources of contaminated air Although unit is weatherproof guard against water from higher level runoff and overhangs B Roof Mount Check building codes for weight distribution requirements sl te1 q qan ooy Bl GQ Y Y NO11036 uIv Alddns ATddns 3015 aiy penaa TWNOI1d0 NyN 38 L NOTO dal qdans 01313 ees Nuni3u Adans NOTLYTASNI 01918 K SAN SIP L91 S y a pos AWEL sal lt S9NIN3dO LINN x x IMG 03 IddAS 01313 TWIYALYW 9NI 3004 43 Idahs 01314 diH15 INVO Gal lddhS 01313 1134 9NI 4004 03 l ans 07314 ONIHS 14 Y31NN09 d31lddhs 07314 Lond 8802 HLIM Q3I lddns 133Sy9 d8vl WOU4 A 3015 804 13NVd 31V n5N CATINO_00VZ 1088004389 CGSp ml 04 L SSL z8B 1 9 0 CATINO 00VZ 1083004389 CANO OOVZ LOBYNDAYYD Z CP o 3881 GH3NHO2 p SL wp K ve 0 Jd y dAL X ZE V S WON gt x 1H913H CAINO 00VZ 1088004889 anla ONY Add yr aV E tro n O UOZ uoy 03 JIUN jo e6pe woudjx 9 d 91 0 1 k S39NYU3101 9NIT3A31 LINN ER mm 829 rE OL 1 pos R SIVEL 2 1 BYE gt e 91 SL l 1 83802 3008 OL LONG HOVLILV zl 4 NOIEN3IQ 9NIO9IN S3HONI ANY S334930 SNOISN3WIG 50 ZEL Fs i QUESO E le sl y T i r 1 9 s YI c 8 ana uaMOd 3 j s MM 804
61. representative for details Table 10 Fan Performance 551A155 With Optional Indoor Fan Motor 551A155 12 TONS Available External Static Pressure in wg 551A155 12 TONS cont Available External Static Pressure in wg po 42 A E A O E CIA 2 Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Cfm LEGEND Bhp Brake Horsepower FIOP Factory Installed Option Watts Input Watts to Motor Standard low medium static drive range is 834 to 1064 rpm Alternate high static drive range is 1161 to 1426 Other rpms require a field supplied drive NOTES 1 Maximum continuous bhp for the optional motor is 4 38 The maxi mum continuous watts is 3775 Do not adjust motor rpm such that motor maximum bhp and or watts is exceeded at the maximum operating cfm 21 Static pressure losses i e EconoMi er must be added to exter nal static pressure before entering Fan Performance table Interpolation is permissible Do not extrapolate Fan performance is based on wet coils clean filters and casing losses See Table 13 for accessory FIOP static pressure information Extensive motor and drive testing on these units ensures that the full bhp and watts range of the motor can be utilized with confi dence Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor f
62. sary B 551A180 240 Units See Fig 32 The 551A180 240 units use a fan motor mounting system that features a slide out motor mounting plate To replace or service the motor slide out the bracket 1 Remove the evaporator fan access panel and the heating control access panel 2 Remove the center post located between the evapora tor fan and heating control access panels and all screws securing it w STRAIGHTEDGE MUST BE PARALLEL WITH BELT ENSURE PROPER CLEARANCE BETWEEN BELT S AND FAN SUPPORT NOTCH MOVABLE FLANGES MOTOR AND FAN SHAFTS MUST BE PARALLEL SETSCREWS PULLEY PULLEY FIXED FLANGES SINGLE GROOVE Fig 30 Evaporator Fan Pulley Alignment and Adjustment MOTOR PULLEY D A UNIT TOP PANEL FAN SCROLL SIDE PLATES E DRAIN CONNECTION Fig 31 551A155 Evaporator Fan Motor Section 3 Loosen nuts on the two carriage bolts in the motor mounting base 4 Using jacking bolt under motor base raise motor to top of slide and remove belt Secure motor in this position by tightening the nuts on the carriage bolts 5 Removethe belt drive 6 Remove jacking bolt and tapped jacking bolt plate 7 Remove the 2 screws that secure the motor mounting plate to the motor support channel 8 Remove the 3 screws from the end of the motor sup port channel that interfere with the motor slide path 9 Slide out the motor and motor mounting plate 10 Disconnect wiring conne
63. t Secure motor in this position by tight ening the nuts on the carriage bolts Loosen movable pulley flange setscrew see Fig 30 4 Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed Increasing fan speed increases load on motor Do not exceed maximum speed specified in Table 1 See Table 8 for air quantity limits 5 Set movable flange at nearest keyway of pulley hub and tighten setscrew See Table 1 for speed change for each full turn of pulley flange 6 Replace and tighten belts See Belt Tension Adjust ment section on page 27 To align fan and motor pulleys 1 Loosen fan pulley setscrews 2 Slide fan pulley along fan shaft 3 Make angular alignment by loosening motor from mounting plate IV EVAPORATOR FAN SERVICE AND REPLACEMENT A 551A155 Units See Fig 31 NOTE Toremove belts only follow Steps 1 6 1 Remove filter and supply air section panels 2 Remove unit top panel 3 Loosen carriage nuts A and B holding motor mount assembly to fan scroll side plates 4 Loosen screw C 5 Rotate motor mount assembly with motor attached as far as possible away from evaporator coil 6 Remove belt 7 Rotate motor mount assembly back past original position toward evaporator coil 8 Remove motor mounting nuts D and E both sides 9 Lift motor up through top of unit 10 Reverse above procedure to reinstall motor 11 Check and adjust belt tension as neces
64. t Kit Accessory 0 F Low Ambient Kit Install the Accessory 0 F Low Ambient Kit per instruction supplied with accessory Sensor Assembly Install the sensor assembly in the loca tion shown in Fig 26 Motor Mount To ensure proper fan height replace the existing motor mount with the new motor mount provided with accessory Transformer 460 v Units Only On 460 volt units a trans former is required The transformer is provided with the accessory and must be field installed Motormaster Control Recommended mounting location is on the inside of the panel tothe left of the control box The control should be mounted on the inside of the panel verti call y with leads protruding from bottom of extrusion B Motormaster III Control Installation 551A240 Only Install Field Fabricated Wind Baffles Wind baffles must be field fabricated for all units to ensure proper cooling cycle operation at low ambient temperatures See Fig 25 for baffle details Use 20 gage galvanized sheet metal or similar corrosion resistant metal for baffles Use field supplied screws to attach baffles to unit Screws should be 1 4 in diameter and 5 g in long Drill required screw holes for mounting baffles N CAUTION To avoid damage to the refrigerant coils and electrical components use recommended screw sizes only Use care when drilling holes Replace Outdoor M otor Replace outdoor fan motor no 1 with motor induded
65. tdoor Air Hood Details C Commissioning The EconoMi er saves energy when it uses outdoor air to provide free cooling instead of mechanical air conditioning The EconoMi er switchover strategy determines if the out door air is suitable for free cooling The EconoMi er chooses the switchover strategy with the most energy savings pro vided that the required sensors are connected and function ing normally IMPORTANT If a sensor stops functioning normally becomes unreliable the EconoMi er switches to the next best strategy SENSOR OUTSIDE AIR SENSOR COVER Fig 21 Outdoor Air Sensor Location MOUNTING SCREW SENSOR WIRING CONNECTIONS MOUNTING SCREW WIRING HARNESS Fig 22 Outdoor Air Sensor Details Refer to Table 5 to determine the sensors required for each strategy Differential Enthalpy Switchover Strategy The differential enthalpy switchover strategy must be selected manually if required To enable press and hold the CONFIG button for 30 seconds then release The LED will flash twice to indicate the change of configuration To return to single enthalpy mode press and hold the CON FIG button for 30 seconds The LED will flash once to indi cate the change of configuration D Discharge Air Thermistor DAT The discharge air thermistor is factory mounted on the suppl y fan housing in the fan section of the unit The DAT is factory wired to the EconoMi er Control Module E
66. tdoor air enthalpy and return air enthalpy sensors installed VIII POWER FAILURE Dampers have a spring return In event of power failure dampers will return to fully dosed position until power is restored Do not manually operate damper motor IX REFRIGERANT CHARGE Amount of refrigerant charge is listed on unit nameplate and in Table 1 Refer to Carrier GTAC II Module 5 Charging Recovery Recyding and Redamation section for charging methods and procedures Unit panels must be in place when unit is operating during charging procedure NOTE Do not use recyded refrigerant as it may contain contaminants A No Charge Use standard evacuating techniques After evacuating sys tem weigh in the specified amount of refrigerant refer to Table 1 B Low Charge Cooling Using cooling charging chart see Fig 35 add or remove refrigerant until conditions of the chart are met Note that charging chart is different from those normally used An accurate pressure gage and temperature sensing device is required Charging is accomplished by ensuring the proper amount of liquid subcooling Measure liquid line pressure at the liquid line service valve using pressure gage Connect temperature sensing device to the liquid line near the liquid line service valve and insulate it so that outdoor ambient temperature does not affect reading C To Use The Cooling Charging Chart Use the above temperature and pressure readings and find the
67. uo 8 9 s 0 MOIIY 1sod 1eu100 JO episino WO e1e suoisueuilq 8 INO A4055322 I eoueJeo o ou s uinb i peolueq Jo 1SNVHXA HAMOA oSu J jqeaow e 9 SION UI paes se 1sneux Jewod Jeduiep l ay pue 109 Jesuepuoo euj JO BOUBIeS O Jo uondeoxe eui YUM Z l Ae4d Aew uonoipsunf JO sepoo e207 e I uolyesodo ue Jasuspuos Jadold aunsse oi 6281 0 9 dOL e 8 1 2 2 I peddinbe os y 1sneuxe NO 1935 2021 semod pue sadwep jo uone1 do 1edoud 104 6121 0 v p s IYBIE e SUINUOO y TWOIdAL la mas ee eae wae ees LC ss ooe xoq 01 U09 JO 6LZ 1 0 p 30044 e Laso ies Rentas h ZAN MOJHIE oo 1esuepuoo 1 do4d 10 6LZL 0 9DIS J81 aou Yid psi 1 l Bh 1 do OY WO EAOWAL 109 juued suonipuoo Jl 6LZL 0 7 0 peonped eq ueo uoisueulp SIUL penoulas 109 JO pgLz 0 4 eeue t ego eoueJee o uinullulN 9 iE WOldAL Re 8 luo qund J001 10sseoo o payoeye eq o xiowong G 30H YIg os 00 TN E NO LI JO uogosua K y t T 1 Apne Jo Jajua GOD IARI Y 9 e L 318 e v S9 ISI ep SIp p0S WWE z 2 Sieleuuilli u ese ui suorsueuliq Z 91 51 S 0 3 91 9 l 10 91751 0 9 91 6 r 1 91 8 p ee 91 El Z 1 gt l Ava Suoisueuuip lOssa99e GUND J00J JO JUL 0 JOJOY pine By ee S3LON y u3Nu02 eles SITA p d l V q 9 a alin swa vwa H3NHOO H3NHOO H3NHOO LHSISM lH9I3M H3NHOO H3 IIWONOO3 LINN ALS 370H
68. uous watts is 5180 Do not adjust motor rpm such that motor maximum bhp and or watts is exceeded at the maximum operating cfm 1421 4414 5 18 1467 4728 1430 4638 5 44 1475 4955 1440 4879 5 72 Static pressure losses i e EconoMi er must be added to exter nal static pressure before entering Fan oa table Interpolation is permissible Do not extrapolate Fan performance is based on wet coils clean filters and casing losses See Table 13 for accessory FIOP static pressure information Extensive motor and drive testing on these units ensures that the full bhp and watts range of the motor can be utilized with confi dence Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor failure Unit warranty will not be affected Use of a field supplied motor may affect wiring size Contact your I Bryant representative for details Table 12 Fan Performance 551A240 551A240 20 TONS Available External Static Pressure in wg NODER ON gt l O P O I o 00 o o gt 0 G On G NN ANO E NO0wNounono FN R OCO CO O 551A240 20 TONS cont G0 OV OY PB Q0 CO O IS Oo Q o N G co 05 05 O 00 G COT OY Os Or Ol qe o iv moivoonuoo dqO60003RO CO E SEO GL OUS Co MO O O WOW Co G 05 Q R 09 CO Available External Static Pressure in wg Cfm 4 17 4 62 5 10 5 62 6 18 6 78 7 42 8 10 8 82 OO
69. utdoor Air Section Details CONTROL MODULE ACTUATOR ECONOMI ER Fig 15 EconoMi er Damper Assembly End View Table 4 Heat Anticipator Settings UNIT UNIT 551A VOLTAGES KEN STAGE 1 STAGE 2 40 66 208 230 3 60 32 40 460 3 60 55 40 80 66 800 1000 10 20 ut or Or CONFIG 1400 1200 60 40 D C 100 go 60 CO SP MECHCLG ECON MIN O PPM LOCKOUT SP POS STATUS Fig 16 EconoMi er Control Module Adjustment Potentiometers CONTROL MODULE ACTUATOR Fig 17 EconoMi er Control Module Location VIII STEP 8 INSTALL OUTDOOR AIR HOOD The same type of factory installed hood is used on units with 25 air ventilation and units with an E conoMi er NOTE The hood top panel upper and lower filter retainers hood drain pan baffle 180 240 and filter support bracket are secured opposite the condenser end of the unit The screens hood side panels remaining section of filter support bracket seal strip and all other hardware are in a package located inside the return air filter access panel Fig 18 1 Attach seal strip to upper filter retainer See Fig 19 2 Assemble hood top panel and side panels upper filter retainer and hood drain pan Fig 20 3 Secure lower filter retainer and long section of filter support bracket to unit See Fig 20 Leave screws loose on size 180 and 240 units 4 Slide baffle size 180 and 240 units b
70. ver 50 kW 1 25 x IFM amps 1 00 x heater FLA EM EM USTED Listes Table 3 Electric Resistance Heater Data STAGES 208 230 240 460 480 MAXIMUM STAGES Heating Cfm Cfm HEATER AMPS cfm Us 208 230 240 460 480 n ESS seed ae tat 3750 1770 3750 1770 1559 1724 179 9 92 0 96 0 5000 2360 1559 1724 179 9 92 0 96 0 Maximum number of stages using accessory low ambient kit or head pressure control device and low ambient kit NOTE Heaters are rated at 240 and 480 v 10 C Optional Non Fused Disconnect On units with the optional non fused disconnect incoming power will be wired into the disconnect switch Refer to Fig 13 for wiring for 100 and 200 amp disconnect switches Units with an MOCP maximum overcurrent protection under 100 will use the 100 amp disconnect switch Units with an MOCP over 100 will use the 200 amp disconnect switch Refer to the applicable disconnect wiring diagram To prevent breakage during shipping the disconnect handle and shaft are shipped and packaged inside the unit control box Install the disconnect handle before unit operation To install the handle and shaft perform the following procedure 1 Open the control box door and remove the handle and shaft from shipping location 2 Loosen the Allen bolt located on the disconnect switch The bolt is located on the square hole and is used to hold the shaft
71. way valve 2 Subcooler control low pressure switch open Cycle unit off and allow low pressure switch to reset Replace switch if it will not close 3 Transformer bad check transformer Liquid line three way valve 1 Solenoid coil defective replace will not operate 2 Solenoid valve stuck closed replace Subcooler will not deenergize Liquid Line three way valve Valve is stuck open replace will not close 1 Low system capacity Low refrigerant charge or Check charge amount See system charging frosted coil section 2 Evaporator coil frosted check and replace subcooler control low pressure switch if necessary Copyright 2001 Bryant Heating amp Cooling Systems CATALOG NO 5355 105 START UP CHECKLIST MODEL NO SERIAL NO DATE TECHNICIAN I PRE START UP O VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT O VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJ USTMENT BOLT 155 UNITS OR AD USTMENT BOLT AND PLATE 180 240 UNITS VERIFY INSTALLATION OF OUTDOOR AIR HOOD VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT CHECK THAT FILTERS AND SCREENS ARE CLEAN AND IN PLACE VERIFY THAT UNIT IS LEVEL CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING ORIFICE AND VERIFY SETSCREW IS TIGHT VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED O VERIFY THAT SCROLL COMPRESSORS ARE ROTATING IN THE CORRECT DIR

Bryant 551a User's Manual

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