Carrier 48PG20-28 - Manuals

Carrier 48PG20-28 – Manual in PDF format online.

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Manual

Manual Carrier 48PG20-28

Summary

Page 2 - must

2 INSTALLATION Step 1 — Provide Unit Support ROOF CURB — Assemble or install accessory roof curb inaccordance with instructions shipped with this accessory. SeeFig. 1. Install insulation, cant strips, roofing, and counter flash-ing as shown. Ductwork can be installed to roof curb beforeunit is set i...

Page 4 - Fig. 3 — Rigging Details; Fig. 2 — Shipping Rail Removal

4 NOTES:1. Add 150 lb (68 kg) for domestic crating.2. See label for unit location on roof curb. DOES NOT INCLUDE ERV ( ENERGY RECOVERY VENTILATOR) OPTION. UNIT SIZE MAX WEIGHT (LB) * CENTER OF GRAVITY ( IN.) X Y Z 66.5 66.5 70.5 36.7 31.4 37.0 37.0 31.8 35.2 3825 4075 4300 PG20 PG24 PG28 Fig. 3 — Ri...

Page 6 - Table 1 — Physical Data

6 Table 1 — Physical Data LEGEND *Aluminum evaporator coil/aluminum condenser coil. UNIT 48PG 20 24 28 VOLTAGE 208/230 and 460 575 208/230 and 460 575 208/230 and 460 575 NOMINAL CAPACITY (Tons) 18 18 20 20 25 25 OPERATING WEIGHT (lb) 48 Series (Low Heat) Al/Al* 2480 2480 2588 2588 2773 2773 COMPRES...

Page 7 - Table 2 — Fan Motor and Drive Data — Vertical Supply/Return

7 Table 2 — Fan Motor and Drive Data — Vertical Supply/Return 48PG 20 24 28 208/230 and 460 575 208/230 and 460 575 208/230 and 460 575 LOW RANGE Motor Hp 3.7 5 3.7 5 5 5 Motor Nominal Rpm 1750 1750 1750 1750 1750 1750 Maximum Continuous Bhp 4.26 5.75 4.26 5.75 5.75 5.75 Maximum Continuous Watts 317...

Page 8 - Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return

8 Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return 48PG 20 24 28 208/230 and 460 575 208/230 and 460 575 208/230 and 460 575 LOW RANGE Motor Hp — — — — 5 5 Motor Nominal Rpm — — — — 1750 1750 Maximum Continuous Bhp — — — — 5.75 5.75 Maximum Continuous Watts — — — — 4290 4290 Motor Frame...

Page 9 - Step 4 — Field Fabricate Ductwork —; Do; Step 5 — Make Unit Duct Connections; Fig. 7 — Air Distribution — Vertical Supply/Return

9 Step 4 — Field Fabricate Ductwork — On vertical units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For horizontal applications, field- supplied flanges should be attached to horizontal dischargeopenings and all ductwork secured to the flanges. Insulate an...

Page 10 - Fig. 10 — Flue and Inlet Hood Locations; Fig. 9 — Concentric Duct Details

10 Step 6 — Install Flue Hood and Inlet Hood — Flue hood (smaller hood), inlet hood (larger hood), and screensare shipped inside the unit in the fan section. To install, removethe heat panel. The flue hood is attached to the heat sectionpanel from the outside using the screws provided. See Fig. 10. ...

Page 11 - Step 9 — Make Electrical Connections; Do not; Fig. 12 — Condensate Drain Details

11 Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection. Step 9 — Make Electrical Connections FIELD POWER SUPPLY — Unit is factory wired for volt-age shown on unit nameplate. Be sure to check for correctvoltage. When installing units, p...

Page 12 - Step 10 — Install Outdoor Air Hood —; Fig. 15 — Field Power Wiring Connections; Fig. 16 — Field Control Thermostat Wiring

12 Set heat anticipator settings as follows: Settings may be changed slightly to provide a greater degree of comfort for a particular installation. Step 10 — Install Outdoor Air Hood — Per- form the following procedure to install the outdoor-air hood onunits equipped with an economizer, two-position...

Page 15 - LEGEND AND NOTES FOR TABLES 4A AND 4B

15 LEGEND AND NOTES FOR TABLES 4A AND 4B LEGEND *Fuse or HACR circuit breaker. NOTES: 1. In compliance with NEC requirements for multimotor and com- bination load equipment (refer to NEC Articles 430 and 440),the overcurrent protective device for the unit shall be fuse orHACR breaker. Canadian units...

Page 16 - Fig. 20 — Manual Damper Details

16 Step 11 — Position Optional Power Exhaust orBarometric Relief Damper Hood — The optional power exhaust or barometric relief dampers are shippedassembled and tilted back into the unit for shipping. Bracketsand extra screws are shipped in shrink wrap around thedampers. 1. Remove 9 screws holding ea...

Page 17 - Fig. 22 — Bracket and Hood Positioning

17 Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details Fig. 22 — Bracket and Hood Positioning

Page 19 - Table 5 — Fan Performance — 48PGD20 Vertical Supply/Return Units

19 Condenser Fans and Motors — Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustmentsection (page 49) as required. Return-Air Filters — Check that correct filters are in- stalled in filter tracks (see Table 1). Do not operate unit withoutreturn-air filters.NOTE: For units with...

Page 20 - Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units

20 Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v) (B) Mid-Low Range: 949-1206 rpm, 5.75 bhp (C) Mid-...

Page 21 - Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units

21 Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v) (B) Mid-Low Range: 949-1206 rpm, 5.75 bhp (C) Mid-...

Page 22 - Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units

22 Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v) (B) Mid-Low Range: 949-1206 rpm, 5.75 bhp (C) Mid-...

Page 23 - Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units

23 Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v) (B) Mid-Low Range: 949-1206 rpm, 5.75 bhp (C) Mid-...

Page 24 - Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units

24 Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 685-939 rpm, 4.26 bhp (208/230 and 460-v), 751-954 rpm, 5.75 bhp (575-v) (B) Mid-Low Range: 949-1206 rpm, 5.75 bhp (C) Mid-H...

Page 25 - Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units

25 Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 687-873 rpm, 5.75 bhp (B) Mid-Low Range: 805-1007 rpm, 5.75 bhp (C) Mid-High Range: 941-1176 rpm, 8.63 bhp (D) High Range:...

Page 26 - Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units

26 Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 687-873 rpm, 5.75 bhp (B) Mid-Low Range: 805-1007 rpm, 5.75 bhp (C) Mid-High Range: 941-1176 rpm, 8.63 bhp (D) High Range:...

Page 27 - Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units

27 Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (A) Low Range: 687-873 rpm, 5.75 bhp (B) Mid-Low Range: 805-1007 rpm, 5.75 bhp (C) Mid-High Range: 941-1176 rpm, 8.63 bhp (D) High Range:...

Page 36 - GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES

36 Table 22 — Fan Performance — 48PGF28 — Horizontal Supply and Return Units LEGEND Boldface indicates field-supplied motor/drive required. NOTES:1. Motor drive ranges: (E) Low Range: 687-873 rpm, 5.75 bhp (F) Mid-Low Range: 805-1007 rpm, 5.75 bhp (G) Mid-High Range: 941-1176 rpm, 8.63 bhp (H) High ...

Page 38 - Table 25 — Evaporator Fan Motor Specifications (cont)

38 Table 25 — Evaporator Fan Motor Specifications (cont) NOTES:1. Extensive motor and electrical testing ensures that the motors can be uti- lized with confidence up to the maximum applied bhp, watts, and amps.Using the fan motor up to the maximum ratings shown will not result in nui-sance tripping ...

Page 39 - Table 27 — Fan Rpm at Motor Pulley Settings*; Optional EconoMi$er IV —; The temperature sensor is a short probe with blue wires

39 Table 26 — Accessory/FIOP Static Pressure (in. wg)* — 48PG20-28 LEGEND *The static pressure must be added to the external static pressure. The sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance tables to deter-mine blower rpm and watts. Table 27 — ...

Page 40 - Table 28 — EconoMi$er IV Sensor Usage; Fig. 25 — Temperature Changeover Set Points

40 Table 28 — EconoMi$er IV Sensor Usage *CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed for installation. †33ZCSENCO2 is an accessory CO 2 sensor. **33ZCASPCO2 is an accessory aspirator box required ...

Page 42 - Fig. 27 — Enthalpy Changeover Set Points

42 CONTROL CURVE ABCD CONTROL POINT APPROX. °F (°C) AT 50% RH 73 (23)70 (21)67 (19)63 (17) 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 9 0 1 0 0 80 70 60 50 40 30 20 10 ENT HA LP Y— BTU P ER PO UN D DR Y A IR 85 (29) 90 (32) 95 (35) 100 (38) 105 (41) 110 (43) 35 (2) 35 (2) 40 (4) 40 (4) 10...

Page 44 - Operating Sequence; Sensor Standard Settings

44 3. Use the Up/Down button to select the preset number. See Table 29. 4. Press Enter to lock in the selection.5. Press Mode to exit and resume normal operation. The custom settings of the CO 2 sensor can be changed any- time after the sensor is energized. Follow the steps below tochange the non-st...

Page 45 - Fig. 30 — Subcooler Operation

45 When ignition occurs the IGC board will continue to moni- tor the condition of the rollout and limit switches, the hall effectsensor, as well as the flame sensor. If the unit is controlledthrough a room thermostat set for fan auto., 45 seconds afterignition occurs, the indoor-fan motor will be en...

Page 46 - What to do if you smell gas:

46 SERVICE Cleaning — Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require. Re-move unit top panel and/or side panels for access to unit interior.COIL MAINTENANCE AND CLEANING RECOMMEN-DATION — Routine cleaning of coil surfaces is essential toma...

Page 47 - Lubrication; Fig. 32 — Removing Heat Exchanger Ceramic; IGC —

47 5. Thoroughly apply Totaline® environmentally sound coil cleaner solution to all coil surfaces including finned area,tube sheets and coil headers. 6. Hold garden sprayer nozzle close to finned areas and ap- ply cleaner with a vertical, up-and-down motion. Avoidspraying in horizontal pattern to mi...

Page 48 - Fig. 33 — Evaporator-Fan Motor Adjustment

48 FAN SHAFT BEARINGS — Lubricate bearings at least ev-ery 6 months with suitable bearing grease. Typical lubricantsare given below: *Preferred lubricant because it contains rust and oxidation inhibitors. FAN MOTOR BEARINGS — Fan motor bearings are of thepermanently lubricated type. No field lubrica...

Page 49 - Table 30 — Belt Tension Adjustment; Verify Sensor Performance —; Table 31 — Sensor Temperature/Resistance Values; Do not manually operate damper motor.; Evacuation —; Fig. 36 — Deep Vacuum Graph

49 Table 30 — Belt Tension Adjustment Condenser-Fan Adjustment (Fig. 35) 1. Shut off unit power supply.2. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews. 3. Adjust fan height as shown in Fig. 35.4. Tighten setscrews and replace condenser-fan assembly...

Page 51 - Fig. 41 — Spark Gap Adjustment

51 4. Set main gas valve to ON position.5. Set thermostat at setting to call for heat.6. Remove screw cap covering regulator adjustment screw (see Fig. 40). 7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure. 8. Once desired pressure is established, set ...

Page 52 - Table 32 — Altitude Compensation*; NATURAL GAS; PROPANE GAS; Filter Drier —

52 Table 32 — Altitude Compensation* NATURAL GAS *As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft. †Orifices available through the local Carrier deale...

Page 53 - Fig. 42 — Typical Low Voltage Control Schematic

Page 54 - Fig. 43 — Typical Power Schematic

Page 57 - Table 33 — Cooling Service Analysis; TXV —

57 TROUBLESHOOTING Unit Troubleshooting — Refer to Tables 33-35 and Fig. 46. Table 33 — Cooling Service Analysis LEGEND TXV — Thermostatic Expansion Valve PROBLEM CAUSE REMEDY Compressor and CondenserFan Will Not Start. Power failure. Call power company. Fuse blown or circuit breaker tripped. Replac...

Page 58 - Table 34 — Gas Heating Service Analysis

58 Table 34 — Gas Heating Service Analysis PROBLEM CAUSE REMEDY Burners Will Not Ignite. Misaligned spark electrodes. Check flame ignition and sensor electrode positioning.Adjust as needed. No gas at main burners. Check gas line for air; purge as necessary. After purging gasline of air, allow gas to...

Page 60 - Table 35 — IGC Board LED Alarm Codes; EconoMi$er IV Troubleshooting

60 Table 35 — IGC Board LED Alarm Codes LEGEND NOTES:1. There is a 3-second pause between alarm code displays.2. If more than one alarm code exists, all applicable alarm codes will be displayed in numerical sequence. 3. Alarm codes on the IGC will be lost if power to the unit is interrupted. EconoMi...

Page 61 - Phase Loss Protection —; LED STATUS

61 DCV (Demand Controlled Ventilation) AND POWEREXHAUST — To check DCV and Power Exhaust: 1. Make sure EconoMi$er IV preparation procedure has been performed. 2. Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuatorshould be fully closed. 3. Connect a 9-v...

Page 64 - UNIT START-UP CHECKLIST; ELECTRICAL

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. PC 111 Catalog No. 534-80211 Printed in U.S.A. Form 48PG-10SI Pg CL-1 9-05 Replaces: New Book 1 4 Tab 1a 6a Copyright 2005 Carrier Cor poration - -- ----...

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