48MPD,MPE62L-10R 50MP62L-10R Single Package Electric Cooling Units and Gas Heating/Electric Cooling Units With Product Integrated Controls Installation, Start-Up and Service Instructions CONTENTS Page GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . 2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28 Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Unit Placement . . . . . .
CONTENTS (cont) Page Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 • COMPRESSORS • FAN SHAFT BEARINGS • FAN MOTOR BEARINGS • DOOR HINGES Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 47 Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Moisture/Liquid Indicator . . . . . . . . . . . . . . . . . . . 49 Filter Driers . . . . . . . . . . . . . . . .
Secure all ducts to the building structure, using flexible duct connectors between roof curb and ducts as required. Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier. Outlet grilles must not lie directly below unit discharge. The return duct must have a 90-degree elbow before opening into the building space if unit is equipped with power exhaust. Design supply duct strong enough to handle expected static pressures.
Table 1 — Physical Data BASE UNIT 48/50MP NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Base Unit (48MP/50MP) Copper Condenser Coils Exhaust Fan COMPRESSORS Number of Refrigerant Circuits Circuit (No. of Cylinders) Model 06E Oil Charge (pints) Capacity Steps (%) REFRIGERANT Operating Charge (lb), Sys 1/Sys 2 (Standard Coil) Operating Charge (lb), Sys 1/Sys 2 (Alternate Coil) CONDENSER COILS Quantity Rows...Fins/in. Total Face Area (sq ft) EVAPORATOR COILS Quantity Rows...Fins/in.
Table1 — Physical Data (cont) BASE UNIT 48/50MP NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb) Base Unit (48MP/50MP) Copper Condenser Coils Exhaust Fan COMPRESSORS Number of Refrigerant Circuits Circuit (No. of Cylinders) Model 06E Oil Charge (pints) Capacity Steps (%) REFRIGERANT Operating Charge (lb), Sys 1/Sys 2 (Standard Coil) Operating Charge (lb), Sys 1/Sys 2 (Alternate Coil) CONDENSER COILS Quantity Rows...Fins/in. Total Face Area (sq ft) EVAPORATOR COILS Quantity Rows...Fins/in.
Table 2 — Optional Power Exhaust Specifications UNIT 48/50MP Type Motor Hp Motor Frame Size Efficiency at Full Load (%) Standard Efficiency High Efficiency Fan Pulley Pitch Diameter (in.) Motor Pulley Pitch Diameter (in.) Fan Rpm Belts Quantity...Model No. Center Distance Range (in.) Maximum Allowable Rpm Type Motor Hp Motor Frame Size Efficiency at Full Load (%) Standard Efficiency High Efficiency Fan Pulley Pitch Diameter (in.) Motor Pulley Pitch Diameter (in.) Fan Rpm Belts Quantity...Model No.
NOTES: 1. Roof curb is shipped disassembled. 2. Roof curb: 14 gage [VA03-56] steel. 3. Dimensions in [ ] are in millimeters. 4. To prevent standing water in the drain pan of the indoor section, roof curb and unit must be level within tolerances shown. NOTES: 1. To prevent the hazard of stagnant water build-up in the drain pan on the indoor section, unit cannot exceed leveling tolerances shown. 2. If a Carrier roof curb is not used, curb cross rails must be postioned to clear unit base rail locations shown.
NOTES: 1. Roof curb is shipped disassembled. 2. Roof curb: 14 gage [VA03-56] steel. 3. Dimensions in [ ] are in millimeters. 4. To prevent standing water in the drain pan of the indoor section, roof curb and unit must be level within tolerances shown. NOTES: 1. To prevent the hazard of stagnant water build-up in the drain pan on the indoor section, unit cannot exceed leveling tolerances shown. 2. If a Carrier roof curb is not used, curb cross rails must be postioned to clear unit base rail locations shown.
UNIT SIZE 48MPD,E 62L 70M WEIGHT lb kg 16,810 7624 18,060 8190 A mm 3505 3647 ft-in. 11- 6 11-119⁄16 B mm 957 1165 C ft-in. 3-111⁄16 3-97⁄8 mm 5909 6166 D ft-in. 19-45⁄8 20-23⁄4 mm 1203 1264 E ft-in. 3-113⁄8 4- 13⁄4 NOTES: 1. Dimensions in [ ] are in millimeters. 2. Center of gravity includes exhaust fan and high heat options. Unit weight does not include exhaust fan or high heat options. 3. High heat add: 260 lb [118 kg] Exhaust fan add: 1675 lb [761 kg] on 62L 1775 lb [807 kg] on 70M 4.
UNIT SIZE 48MPD,E 82N 90P 10R WEIGHT lb kg 22,660 10 295 24,660 11 203 25,110 11 408 A mm 3646 1938 1938 B ft-in. 11-119⁄16 6- 45⁄16 6- 45⁄16 mm — 2572 2572 C ft-in. — 8-51⁄4 8-51⁄4 mm 6734 7283 7268 D ft-in. 22- 11⁄8 23-103⁄4 23-101⁄8 mm 1753 1765 1759 E ft-in. 5-9 5-91⁄2 5-91⁄4 mm 13 957 14 821 14 821 F ft-in. 45-91⁄2 48-71⁄2 48-71⁄2 mm 15 202 16 066 16 066 ft-in. 49-101⁄2 52- 81⁄2 52- 81⁄2 4. Unit clearances: Top — Do not restrict condenser fans, control box end — 68-09.
UNIT SIZE 50MP 62L 70M WEIGHT (See Note 3) lb kg 16,550 7511 17,800 8078 NOTES: 1. Dimensions in [ 2. A mm 3505 3647 B ft-in. 118- 69 118-119⁄169 mm 957 1165 ft-in. 38-111⁄169 38-97⁄8 C1 (See Note 2) mm ft-in. 5880 198-31⁄29 6166 208-23⁄4 C2 (See Note 2) mm ft-in. 6325 208-99 6649 218-93⁄49 D mm 1203 1264 ft-in. 38-113⁄89 48- 13⁄49 E mm 13 011 13 297 F ft-in. 428-81⁄49 438-71⁄29 mm 14 256 14 542 ft-in.
UNIT SIZE 50MP 82N 90P 10R WEIGHT (See Note 3) lb kg 22,400 10 295 24,750 11 375 25,100 11 536 NOTES: 1. Dimensions in [ 2. A mm 3646 1938 1938 B ft-in. 118-119⁄169 68- 45⁄169 68- 45⁄169 mm — 2572 2572 ft-in. — 88-51⁄4 88-51⁄4 (See mm 6702 7383 7383 C1 Note 2) ft-in. 218-117⁄89 238-103⁄4 238-101⁄8 (See mm 7180 7787 7793 C2 Note 2) ft-in. 238-611⁄169 258-69⁄169 258-613⁄169 D mm 1753 1765 1759 ft-in. 58-99 58-91⁄29 58-91⁄49 E mm 13 957 14 821 14 821 F ft-in.
NOTICE TO RIGGERS UNIT SIZE 62L 70M 82N 90P 10R Unit 48MP lb kg 16,810 7 624 18,060 8 190 22,660 10 295 24,660 11 203 25,110 11 408 WEIGHT Unit 50MP lb kg 16,550 7 507 17,800 8 074 22,400 10 161 24,750 11 227 25,100 11 385 Exhaust Fan lb kg 1675 760 1775 805 2275 1032 2400 1089 2400 1089 A in. 71.25 71.25 71.25 71.25 71.25 B mm 1810 1810 1810 1810 1810 NOTE: All lifting lugs must be used when rigging with eight or ten cables and spread with four or five 95 in.
Field Electrical Connections PITCH DRAIN LINE TO OFFSET LINE FRICTION SEALANT IMPORTANT: The 48/50MP units generate, use, and can radiate radio frequency energy. If units are not installed and used in accordance with these instructions, they may cause radio interference.
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%. Disconnect must be located within sight of the unit and readily accessible from the unit in compliance with NEC Article 440-14. All field wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) value shown on the unit informative plate. See Fig. 12 for power wiring connections to the unit power terminal block and equipment ground.
Table 5 — Electrical Data UNIT 48MP/ 50MP VOLTAGE 3 Ph, 60 Hz Min 62L 460 70M 460 82N 460 90P 460 10R COMP FLA Hp LRA MCA MOCP RLA VOLTAGE RANGE 460 — — — — — — — 414 414 414 414 414 Max 508 508 508 508 508 COMP NO. A1 RLA 65.4 46.8 43.6 43.6 43.6 LRA 345 253 223 223 223 COMP NO. A2 RLA — 34.6 34.6 46.8 65.4 LRA — 173 173 253 345 COMP NO. B1 RLA 65.4 65.4 43.6 43.6 43.6 LRA 345 345 223 223 223 COMP NO. B2 RLA — — 43.6 46.8 46.
pins E2 and E3, and an RJ11 female connector. The RJ11 connector is used to tap into the CCN at the sensor. See RJ11 Plug Wiring section on page 24 to connect the RJ11 connector to the CCN. Control Wiring — See Fig. 13 for sensor wiring connections to main and auxiliary control boxes. The recommended types of control wiring for 48/50MP unit devices are shown in Table 6.
LEGEND Common Switch Terminal Terminal Block Thermostat Heating Accessory Field Wiring *Constant volume applications only. COM SW T TB TH Fig.
RED BLK RED BLK TB3 1 2 RED RED RED BLK BLK BLK TO PROCESSOR MODULE NO. 1 SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4 SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION BLK SENSOR 1 RED RED BLK BLK SENSOR 5 SENSOR 6 RED BLK SENSOR 3 SENSOR 2 SENSOR 4 LEGEND TB — Terminal Block Factory Wiring Field Wiring RED BLK RED BLK 2 TO PROCESSOR MODULE NO. 1 RED BLK RED TB3 1 SENSOR 7 RED RED BLK BLK SENSOR 8 SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION Fig.
FIELD-SUPPLIED 24-V ISOLATED POWER SUPPLY ACCESSORY DSIO2 J5 TB3 12 RED 8 FIELD CONTROL WIRING OUTSIDE AIR RELATIVE HUMIDITY TB3 2 7 1 BLU 11 1 12 9 24V J1 J2 2 FIELD-SUPPLIED 24-V ISOLATED POWER SUPPLY 13 ORN 10 10 1 2 CHANNEL 60 15 J1 J2 1 LEGEND TB — Terminal Block Field Wiring 24V SPACE/RETURN RELATIVE HUMIDITY Component Terminal □ 2 LEGEND TB — Terminal Block Field Wiring Terminal Block Terminal Fig.
TO 24-V ISOLATED TRANSFORMER BRN OUTDOOR AIR + 24V RED 24V - TB2 PSIO NO. 2 9 J6 10 CFM ACY + 37 LEGEND TB — Terminal Block Field Wiring HYD VLV - 38 HYDRONIC VALVE ACTUATOR Component Terminal □ Terminal Block Terminal LEGEND TB — Terminal Block Field Wiring Fig. 21 — Outdoor Airflow Control Component Terminal Fig. 24 — Hydronic Heating PSIO NO. 2 J7 31 6 Fig. 22 — Timed Discrete Output TB2 LEGEND TB — Terminal Block Field Wiring PSIO NO.
PSIO NO.
VFD PECB (EXHAUST) IFCB (SUPPLY) PEC (EXHAUST) IFC (SUPPLY) L1 L1 (R) T1 L2 L2 (S) T2 L3 L3 (T) T3 EFM (EXHAUST) IDFM (SUPPLY) GROUND 460V SHIELD G VOLTAGE SELECTOR (SUPPLY) PSIO1 J6 CHANNEL 16 + 46 S1 1 FI IFR (SUPPLY PER (EXHAUST) - 47 3 FC SC (EXHAUST) PSIO1 J6 CHANNEL 15 EFM IDFM IFC IFCB IFR PEC PECB PER VFD + 43 - 44 — — — — — — — — — LEGEND Exhaust Fan Motor Indoor Fan Motor Indoor Fan Contactor Indoor Fan Circuit Breaker Indoor Fan Relay Power Exhaust Contactor Power Exhau
The following color code is recommended: SIGNAL TYPE 1 GROUND 2 CCN BUS CONDUCTOR INSULATION COLOR RED WHITE BLACK RJ11 PLUG WIRING — Units on the CCN can be monitored from the space at the sensor through the RJ11 connector, if desired. To wire the RJ11 connector into the CCN (Fig. 30): COMM1 PLUG PIN NO. 1 2 3 IMPORTANT: The cable selected for the RJ11 connector wiring MUST be identical to the CCN communication bus wire used for the entire network. Refer to Table 7 for acceptable wiring.
Fig. 31 — Auxiliary Control Box Location (50MP70M Unit Shown) VARIABLE FREQUENCY DRIVE BPC DPC DUCT PRESSURE TRANSDUCER LO BUILDING PRESSURE TRANSDUCER (HIDDEN) FACTORY INSTALLED TUBING HI LO HI TO BUILDING PRESSURE TO SUPPLY DUCT FIELD INSTALLED TUBING TO OUTDOOR REFERENCE PRESSURE PORT LEGEND BPC — Building Pressure Controller DPC — Duct Pressure Controller Fig. 33 — Air Pressure Tubing Locations Fig.
Gas Piping (48 Series Units Only) — Unit is equipped for use with natural gas only. Installation must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1. A 1⁄8-in. NPT tapping plug, accessible for test gage connection, must be field installed immediately upstream of gas supply connection to unit, but after manual gas valve. See Fig. 34. Natural gas pressure at unit gas connection must not be less than 5 in. wg or greater than 13 in. wg.
PUSH BAFFLE DOWN SO THESE 2 HOLES ALIGN FLUE DEFLECTOR BAFFLE Check Compressor Mounting FLUE DEFLECTOR HOOD UNITS 48/50MP62L — Compressors are mounted on pans and are held down by 4 rail bolts during shipment. After unit is installed, loosen each of these bolts until the snubber washer can be moved with finger pressure. See Fig. 40 and 41. UNITS 48/50MP70M-10R — Compressors are mounted on rails and held down by rail bolts during shipment.
PRE-START-UP IMPORTANT: Before beginning Pre-Start-Up or StartUp, review Start-Up Checklist at the center of this publication. The Checklist assures proper start-up of a unit and provides a record of unit condition, application requirements, system information, and operation at initial start-up. Do not attempt to start the air-conditioning system until following checks have been completed. System Check 1. Check the outside air hoods to ensure the hoods are fully opened and secure, with filters in place. 2.
Observe the maximum wheel speed and unit airflow limits for the specific unit size and fan type. See Tables 8-12 for forward curve supply fan performance. See Tables 13-17 for air foil supply fan performance. FAN PERFORMANCE, 48MP UNITS — To obtain fan performance for 48MP units: 1. Enter fan performance table for appropriate base unit type and unit size. 2. Determine the external static pressure from the fan performance table using fan type, field-measured rpm, and airflow (cfm). 3.
Table 8 — Fan Performance (Forward Curved) — 48/50MP62L* AIRFLOW (Cfm) 16,000 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 AIRFLOW (Cfm) 16,000 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 0.50 Rpm 346 371 398 426 455 484 514 544 575 0.75 Bhp 3.4 4.7 6.3 8.4 11.0 14.2 18.0 22.5 27.9 2.00 Rpm 536 549 564 582 601 622 644 667 692 Rpm 382 404 428 454 481 508 537 566 595 AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 1.00 1.25 1.50 Bhp Rpm Bhp Rpm Bhp Rpm Bhp 4.1 415 5.0 448 6.0 478 7.
Table 10 — Fan Performance (Forward Curved) — 48/50MP82N* AIRFLOW (Cfm) 22,000 24,000 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 AIRFLOW (Cfm) 22,000 24,000 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 0.50 Rpm 293 308 324 341 358 375 393 411 430 448 467 0.75 Bhp 6.2 7.6 9.2 11.0 13.1 15.5 18.2 21.2 24.6 28.3 32.5 2.00 Rpm 462 466 472 480 489 500 512 524 538 552 567 Bhp 15.0 16.6 18.6 20.8 23.4 26.2 29.4 32.9 36.8 41.0 45.
Table 12 — Fan Performance (Forward Curved) — 48/50MP10R* AIRFLOW (Cfm) 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 48,000 50,000 52,000 AIRFLOW (Cfm) 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 48,000 50,000 52,000 0.50 Rpm 315 330 346 368 386 405 424 443 463 482 502 521 541 561 0.75 Bhp 9.5 11.2 13.2 15.6 18.4 21.5 24.9 28.7 33.0 37.6 42.6 48.1 54.0 60.5 Rpm 346 359 372 386 404 421 449 458 476 495 514 533 553 572 2.
Table 14 — Fan Performance (Air Foil) — 48/50MP70M* AIRFLOW (Cfm) 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 34,000 36,000 AIRFLOW (Cfm) 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 34,000 36,000 0.50 Rpm Bhp 668 5.1 725 6.6 781 8.2 837 10.0 898 12.3 955 14.8 1011 17.4 1071 20.7 1129 24.3 1186 28.1 3.00 Rpm Bhp 983 14.3 1014 16.3 1050 18.5 1089 20.9 1132 23.8 1172 26.8 1219 30.3 1270 34.4 1319 38.9 1369 43.6 0.75 Rpm Bhp 702 5.9 756 7.4 809 9.1 864 11.0 923 13.4 979 16.0 1034 18.
Table 16 — Fan Performance (Air Foil) — 48/50MP90P* AIRFLOW (Cfm) 24,000 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 AIRFLOW (Cfm) 24,000 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp 501 5.70 534 6.78 565 7.89 594 9.05 622 10.2 649 11.5 674 12.7 702 14.1 729 15.
Table 18 — Component Pressure Drop (in. wg) COMPONENT 22,000 26,400 30,000 34,000 38,000 42,000 45,800 48,200 52,000 HEAT EXCHANGER 0.31 0.40 0.49 0.58 0.70 0.82 0.95 1.03 1.23 (48MP ONLY) Table 19 — Maximum Allowable Supply Fan Wheel Speed (Rpm) 48/50MP 62L, 70M 82N, 90P, 10R FAN TYPE Forward Curved 835 715 and nominal cfm delivery. See Table 22 for clean filter pressure drops for help in locating the ‘‘pivot’’ point.
The HSIO keypad and display module is installed by connecting the power and communication plugs and can be easily moved from one unit to another. Because of this flexibility, one HSIO can be used for several units. Unit operation is controlled by the status of the run/ standby mode on the HSIO. To access the mode, press POINT CONTROL CONTROL (Approx Deg F) CURVE AT 50% RH A 73 B 68 C 63 D 58 on the HSIO keypad, and then press . The HSIO will display either STBY YES or STBY NO.
For example, the occupied cool set point is currently set at the default value of 78 F. To change the occupied set point to 72 F: 1. Press to enter the occupied cool set point function. The display will read OCSP 78. ENTER and the display will read OCSP 72. 2. Press Set points can be changed by the user provided that the values are within the allowable range for the input. If the input is not within the allowable range, the original value will remain displayed.
Table 25 — Basic Configuration Data SET POINT SUBFUNCTION DISPLAY DEFAULT RANGE Unit Type TYPE 1 = VAV CV = 0, VAV = 1 CV Fan Mode FANM 1 (Continuous) Auto = 0, Cont = 1 Economizer Minimum Damper Position MDP 20 percent 0 to 100 Heating Occupied* OHSP 68 (F) 55 to 80 Cooling Occupied OCSP 78 (F) 55 to 80 Cooling Unoccupied UCSP 90 (F) 75 to 95 Heating Unoccupied UHSP 55 (F) 40 to 80 Static Pressure SPSP 1.5 (in. wg) 0 to 5.
Economizer operation is permitted if the system is not in Heating mode, if outdoor air enthalpy (via switch or humidity differential) is acceptable, and if outside air temperature is less than space temperature. If economizer operation is permitted, the ecomizer control loop checks for Cooling System operation. If ON, the outside air dampers will be driven to maximum position. If cooling is not on , for VAV units, the economizer will modulate to satisfy the supply air set point.
set point is user configurable. Like adaptive optimal start, the control corrects itself for optimal operation by adjusting the ‘‘K’’ factor as required. GAS HEATING, OPERATION (48MP Units Only) — Refer to the Controls, Operation and Troubleshooting instructions for information on the control logic used by the unit controls for gas heat operation. The 48MPD units have 2 gas heat sections. The 48MPE units have 3 gas heat sections. Each individual section operates in the same manner.
5. Verify/adjust the SMG. If the SMG is too large, the loop will tend to oscillate (hunt). If it is too small, the loop will react too slowly. Control Loop Checkout Verify or adjust the SMG as follows: Using the HSIO keypad, force the submaster reference of the control loop to a value above or below the actual sensor reading. Verify that the actuator responds correctly. If the actuator drives in the wrong direction, go to the submaster gain (SMG) for the control loop and reverse the sign of the gain.
8. Once the submaster loop is adjusted, remove all forced values and proceed with verification and adjustment of master loop. 9. To check the master loop: Create a demand in the master loop. For example: Force the actual space temperature to a value less than the heating set point or greater than the cooling set point. 10. Observe system (loop) response for 10 to 20 minutes to verify stable control.
Motor Protection — Manual reset, calibrated trip, magnetic circuit breakers are provided for each compressor, supply fan motor, and optional exhaust fan motor. Outdoor fan motor circuits are also protected by circuit breakers. Refer to the Service section more information on servicing motors. KEYPAD AND DISPLAY MODULE (HSIO) IMPORTANT: The HSIO (human sensor input/output) keypad and display module is required for initial start-up of these units.
Table 29 — HSIO Keypad and Display Module Functions and Subfunctions FUNCTIONS Schedule Service SUB FUNCTION NO.
Table 30 — Variable Frequency Drive (VFD) Display DISPLAY Fref Fout lout kWout F/R Montr Accel Decel Vmtr V/F Fgain Fbias FLA PID kWsav PRGM SERVICE Service Access — All unit components can be reached ACTION Not used. Displays the output frequency at which the VFD is currently operating. This is a display only function. The user cannot change this displayed value. Displays the level of output current that the VFD is currently producing. This is a display only function.
GAS HEAT SECTION — Access to the gas heat section is through the door labeled ‘‘HEAT SECTION’’ on the right hand side of the unit. All gas system components are in the gas section. On 48MP62L and 70M units, additional access to the gas components is through the access panels in the unit corner post at the gas section. See Fig. 51. UNIT CONTROL BOX — Access to this component is through the doors marked ELECTRICAL SECTION on the condenser end of the unit.
All units are shipped with a complete operating charge of R-22. See unit nameplate and Table 1 for amount of charge. When adding a complete charge, evacuate system using standard evacuating procedures and weigh in the specified amount of charge. All units have charging charts for each refrigerant circuit. See Fig. 55-59. MAIN BURNERS (48MP Only) — At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames.
Fig. 55 — Charging Chart — Unit 48/50MP62L Fig. 56 — Charging Chart — Unit 48/50MP70M Fig.
LIQUID TEMPERATURE AT LIQUID VALVE (DEG F) 150 ADD CHARGE IF ABOVE CURVE 125 100 REMOVE CHARGE IF BELOW CURVE 75 50 100 150 200 250 300 350 400 LIQUID PRESSURE AT LIQUID VALVE (PSIG) ALL OUTDOOR FANS MUST BE OPERATING LIQUID TEMPERATURE AT LIQUID VALVE (DEG F) LIQIUD TEMPERATURE AT LIQUID VALVE (DEG F) Fig.
Replace the filter cores whenever the moisture/liquid indicator shows moisture in the system. Follow instructions on the packaging for the replacement cores for disassembling and reassembling the filter assemblies and housings. Pressure Relief — High-side pressure relief is provided by a fusible plug in the liquid line at the service valve. For low-side pressure relief, a fusible plug is inserted in the side of the accumulator. See Fig. 60.
CYLINDER HEADS MUFFLER PRESSURE RELIEF VALVE SIGHT GLASS RAIL CRANKCASE HEATER HIGHPRESSURE SWITCH OIL EQUALIZER LINE LOWPRESSURE SWITCH NOTE: Units 48/50MP62L compressors are pan mounted. Units 48/50MP70M and 82N compressors are mounted on rails. Fig. 60 — 06E Compressors, Typical Fig.
6. Remove screw cap covering regulator adjustment screw (see Fig. 63). 7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure. 8. Once desired pressure is established, set thermostat setting for no call for heat, turn off main gas valve, remove pressure-measuring device, and replace 1⁄8-in. pipe plug and screw cap. PULLEY ALIGNMENT — For proper belt life, the motor and fan pulleys must be properly aligned. To check, first turn off unit power.
CONDENSER-FAN MOTOR PROTECTION — Each condenser-fan motor is internally protected against overtemperature. They are also protected against a severe overcurrent condition by manual reset, calibrated trip, magnetic circuit breakers on a common circuit. As with the circuit breakers, do not bypass connections or increase breaker size to correct trouble. Determine the cause and correct it before resetting the breaker. HIGH- AND LOW-PRESSURE SWITCHES — See Fig. 60 for compressor mounting locations.
16. Press to check the remainder of the user configuration values. 17. After completing the configuration steps outlined above, close all remaining circuit breakers and perform a unit test. 18. Complete this procedure and restore the unit to normal operation by returning the STANDBY/RUN mode to STBY NO. Processor Module(s) (PSIO) INPUTS — Each input channel has 3 terminals; 2 are used. OUTPUTS— Output of the PSIO module is 24 vdc or 4 to 20 mA dc. There are 3 terminals; 2 are used.
5. Disconnect power wires at terminal box and disconnect conduit. 6. Disconnect wires from crankcase heater. 7. Disconnect service valves from compressor. NOTE: On units with 2 compressors per circuit, disconnect both oil equalizer lines located on the motor barrel and on the oil pump sump. 8. Units 48/50MP62L: a. Remove 4 large screws securing compressor mounting pan to unit base rail. b. Slide compressor (on mounting pan) to outside of unit frame; support and/or lower to ground. c.
TROUBLESHOOTING AND DIAGNOSTICS PROBLEM COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 2. Fuses blown in field power circuit. 3. Alarm tripped. 4. No control power. SOLUTION 1. 2. 3. 4. 5. Compressor circuit breaker tripped. 5. 6. Safety device lockout circuit active. 7. Low-pressure switch open. 6. 7. 8. High-pressure switch open. 8. 9. Loose electrical connections. 10. Compressor stuck. Contactor Closed 1. Compressor leads loose. 2. Motor windings open. 3. Single phasing. 9. 10.
TROUBLESHOOTING AND DIAGNOSTICS (cont) PROBLEM COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low. 2. Head pressure low. 3. Air filters dirty. 4. Expansion valve power head defective. 5. Indoor coil partially iced. 6. Indoor airflow restricted. Suction Pressure High 1. Unloaders not functioning. 2. Compressor valve defective. 3. Heat load excessive. UNIT OPERATES TOO LONG OR CONTINUOUSLY 1. Low refrigerant charge. 2. Control contacts fused. 3. Air in system. 4.
Refer to Fig. 65 for IGC troubleshooting information. LEGEND IGC — Integrated Gas Unit Controller PIC — Product Integrated Control Fig.
PACKAGED SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Installation Overview • Maintenance • Operating Sequence A large selection of product, theory, and skills programs are available, using popular video-based formats and materials. All include video and/or slides, plus companion book.
START-UP CHECKLIST MODEL NO.: SERIAL NO.: DATE: TECHNICIAN: I.
III. PRELIMINARY CHECKLIST ITEMS (cont) CHANGES TO DEFAULT VALUES M RECORD ALL CHANGES MADE TO FACTORY DEFAULT VALUES IV. START-UP CHECK EVAPORATOR FAN SPEED AND RECORD. CHECK CONDENSER FAN SPEED AND RECORD.
CONTROL CONFIGURATION KEYBOARD ENTRY DISPLAY ENTER x ENTER VALUES IN [ DESCRIPTION ] INDICATE FACTORY DEFAULTS LOG ON Enter password followed by LOGGEDON Logged on okay FACT CFG Factory configuration TYPE X Unit type (0 = CV, 1 = VAV) [Default is 1] TYPE X Verify unit type and change if necessary. If CV unit, see CV control configuration.
CONSTANT VOLUME CONTROL CONFIGURATION DESCRIPTION DISPLAY KEYBOARD ENTRY FACT CONFIG x ENTER ENTER FANM Fan Mode FANMx Select Fan Mode (Auto. = 0, Cont. = 1) ECONOMIZER Configure Economizer SMG x.x Submaster Gain SMG 8.0 Set SMG to 8.0 [1] [−7.5[ NOTES: Copyright 1998 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 1 PC 111 Catalog No. 534-893 Printed in U.S.A.
