Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28- User Manual

Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28

Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 2 – must
  • Page 4 – Fig. 3 — Rigging Details; Fig. 2 — Shipping Rail Removal
  • Page 6 – Table 1 — Physical Data
  • Page 7 – Table 2 — Fan Motor and Drive Data — Vertical Supply/Return
  • Page 8 – Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return
  • Page 9 – Step 4 — Field Fabricate Ductwork —; Do; Step 5 — Make Unit Duct Connections; Fig. 7 — Air Distribution — Vertical Supply/Return
  • Page 10 – Fig. 10 — Flue and Inlet Hood Locations; Fig. 9 — Concentric Duct Details
  • Page 11 – Step 9 — Make Electrical Connections; Do not; Fig. 12 — Condensate Drain Details
  • Page 12 – Step 10 — Install Outdoor Air Hood —; Fig. 15 — Field Power Wiring Connections; Fig. 16 — Field Control Thermostat Wiring
  • Page 15 – LEGEND AND NOTES FOR TABLES 4A AND 4B
  • Page 16 – Fig. 20 — Manual Damper Details
  • Page 17 – Fig. 22 — Bracket and Hood Positioning
  • Page 19 – Table 5 — Fan Performance — 48PGD20 Vertical Supply/Return Units
  • Page 20 – Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units
  • Page 21 – Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units
  • Page 22 – Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units
  • Page 23 – Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units
  • Page 24 – Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units
  • Page 25 – Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units
  • Page 26 – Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units
  • Page 27 – Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units
  • Page 36 – GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES
  • Page 38 – Table 25 — Evaporator Fan Motor Specifications (cont)
  • Page 39 – Table 27 — Fan Rpm at Motor Pulley Settings*; Optional EconoMi$er IV —; The temperature sensor is a short probe with blue wires
  • Page 40 – Table 28 — EconoMi$er IV Sensor Usage; Fig. 25 — Temperature Changeover Set Points
  • Page 42 – Fig. 27 — Enthalpy Changeover Set Points
  • Page 44 – Operating Sequence; Sensor Standard Settings
  • Page 45 – Fig. 30 — Subcooler Operation
  • Page 46 – What to do if you smell gas:
  • Page 47 – Lubrication; Fig. 32 — Removing Heat Exchanger Ceramic; IGC —
  • Page 48 – Fig. 33 — Evaporator-Fan Motor Adjustment
  • 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
  • Page 51 – Fig. 41 — Spark Gap Adjustment
  • Page 52 – Table 32 — Altitude Compensation*; NATURAL GAS; PROPANE GAS; Filter Drier —
  • Page 53 – Fig. 42 — Typical Low Voltage Control Schematic
  • Page 54 – Fig. 43 — Typical Power Schematic
  • Page 57 – Table 33 — Cooling Service Analysis; TXV —
  • Page 58 – Table 34 — Gas Heating Service Analysis
  • Page 60 – Table 35 — IGC Board LED Alarm Codes; EconoMi$er IV Troubleshooting
  • Page 61 – Phase Loss Protection —; LED STATUS
  • Page 64 – UNIT START-UP CHECKLIST; ELECTRICAL
Loading the manual

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 1

9-05

Replaces: New

Book 1

4

Tab

1a 6a

Installation, Start-Up and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . 1,2

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Step 1 — Provide Unit Support

. . . . . . . . . . . . . . . . . . . . . . . . .2

•

ROOF CURB

•

ALTERNATE UNIT SUPPORT

•

SLAB MOUNT

Step 2 — Remove Shipping Rails

. . . . . . . . . . . . . . . . . . . . . . .2

Step 3 — Rig and Place Unit

. . . . . . . . . . . . . . . . . . . . . . . . . . . .2

•

POSITIONING

•

ROOF MOUNT

•

INSTALLATION ONTO CURB

Step 4 — Field Fabricate Ductwork

. . . . . . . . . . . . . . . . . . . . .9

Step 5 — Make Unit Duct Connections

. . . . . . . . . . . . . . . . . .9

•

VERTICAL CONFIGURATION

•

HORIZONTAL APPLICATIONS

Step 6 — Install Flue Hood and Inlet Hood

. . . . . . . . . . . . 10

Step 7 — Trap Condensate Drain

. . . . . . . . . . . . . . . . . . . . . 10

Step 8 — Install Gas Piping

. . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Step 9 — Make Electrical Connections

. . . . . . . . . . . . . . . . .11

•

FIELD POWER SUPPLY

•

FIELD CONTROL WIRING

Step 10 — Install Outdoor-Air Hood

. . . . . . . . . . . . . . . . . . . 12

•

MANUAL DAMPER ASSEMBLY

Step 11 — Position Optional Power

Exhaust or Barometric Relief Damper Hood

. . . . . . . . . 16

Step 12 — Non-Fused Disconnect

. . . . . . . . . . . . . . . . . . . . 16

Step 13 — Install All Accessories

. . . . . . . . . . . . . . . . . . . . . 16

PRE-START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-45

Unit Preparation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Compressor Mounting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Refrigerant Service Ports

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Crankcase Heater(s)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Compressor Rotation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Internal Wiring

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Subcooler Heat Exchanger (SHX)

. . . . . . . . . . . . . . . . . . . . . 18

Evaporator Fan

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Condenser Fans and Motors

. . . . . . . . . . . . . . . . . . . . . . . . . . 19

Return-Air Filters

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Outdoor-Air Inlet Screens

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Gas Heat

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Optional EconoMi$er IV

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Operating Sequence

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46-57

Cleaning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Lubrication

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Manual Outdoor Air Damper

. . . . . . . . . . . . . . . . . . . . . . . . . . 48

Economizer Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Evaporator Fan Service and Replacement

. . . . . . . . . . . . 48

Evaporator Fan Performance Adjustment

. . . . . . . . . . . . . 48

Evaporator Fan Belt Tension Adjustment

. . . . . . . . . . . . . 48

Condenser Fan Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Verify Sensor Performance

. . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Economizer Operation During Power Failure

. . . . . . . . . . 49

Evacuation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Refrigerant Charge

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Gas Valve Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

High Altitude

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Main Burners

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Filter Drier

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Protective Devices

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Relief Devices

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Page

Control Circuit, 24-V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Replacement Parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Diagnostic LEDs

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

TROUBLESHOOTING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57-61

Unit Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

EconoMi$er IV Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . 60

Phase Loss Protection

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

UNIT 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 the basic maintenance

functions 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 labels attached to the unit,
and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.

Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.

Puron (R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
If service equipment is not rated for Puron refrigerant,
equipment damage or personal injury may result.

1. Improper installation, adjustment, alteration, service,

or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User’s Information
Manual provided with this unit for more details.

2. Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other
appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any

phone in your building.

3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire

department.

48PG20-28

Single Package Rooftop Units

Electric Cooling/Gas Heating with

Electromechanical Controls and PURON® (R-410A) Refrigerant

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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...

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