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48PM20---28
Single Package Rooftop Units
Electric Cooling/Gas Heating with
COMFORTLinkt Controls and PURONR (R---410A) Refrigerant
IMPORTANT: This installation instruction contains basic unit
installation information including installation of field control
devices. For information on unit start-up, service, and operation,
refer to the unit Controls, Start-Up, Operation, Service, and
Troubleshooting Instructions also enclosed in the unit literature
packet.
TABLE OF CONTENTS
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Installation Instructions
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SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions
of replacing filters. All other operations should be performed by
trained service personnel. When working on air-conditioning
PAGE
equipment, observe precautions in the literature, tags and labels
1
attached to the unit, and other safety precautions that may apply.
2
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguishers
2
available for all brazing operations.
2
Recognize safety information. This is the safety- -alert symbol
2
When you see this symbol on the furnace and in instructions or
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manuals, be alert to the potential for personal injury.
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Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety- -alert symbol.
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DANGER identifies the most serious hazards which will result in
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severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
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to identify unsafe practices which may result in minor personal
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injury or product and property damage. NOTE is used to highlight
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suggestions which will result in enhanced installation, reliability, or
operation.
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!
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ELECTRICAL SHOCK HAZARD
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Failure to follow this warning could result in personal
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injury or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch.
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UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injury
or equipment damage.
Puronr (R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puron refrigerant
equipment.
WARNING
CAUTION
.
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Summary of Contents for Carrier COMFORTLink PURON 48PM20
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Page 1: Table Of Contents
48PM20---28 Single Package Rooftop Units Electric Cooling/Gas Heating with COMFORTLinkt Controls and PURONR (R---410A) Refrigerant Installation Instructions SAFETY CONSIDERATIONS IMPORTANT: This installation instruction contains basic unit installation information including installation of field control Installation and servicing of air-conditioning equipment can be devices. -
Page 2: Installation
A, B, or C roof covering unit operation, adequate combustion and ventilation air must be material. Carrier roof curb accessories are for flat roofs or slab provided in accordance with Section 5.3 (Air for Combustion and mounting. - Page 4 SHIPPING RAILS C06273 Fig. 2 - - Shipping Rail Removal CAUTION: NOTICE TO RIGGERS: ALL PANELS MUST BE IN PLACE WHEN RIGGING. NOTICE TO RIGGERS: Rig by inserting hooks into unit base rails as shown. Maintain a distance of 120 inches (3048 MM) from top of unit to eyehook. Leave coil cover attached to unit while rigging to protect coil of unit from damage.
- Page 6 Table 1 – Physical Data UNIT 48PM NOMINAL CAPACITY (TONS) VOLTAGE (volts) 208/230 / 460 / 575 208/230 / 460 / 575 208/230 / 460 / 575 OPERATING WEIGHT (lbs) Unit* 2329 2344 2494 ™ Humidi--MiZer System Economizer … … …...
- Page 7 Table 2 – Fan Motor and Drive Data — Vertical Supply/Return UNIT 48PM Voltage (volts) 208/230 and 460 208/230 and 460 208/230 and 460 LOW RANGE Motor HP Motor Nominal RPM 1750 1750 1750 1750 1750 1750 Maximum Continuous BHP 4.26 5.75 4.26...
- Page 8 Table 3 – Fan Motor and Drive Data — Horizontal Supply/Return UNIT 48PM Voltage (volts) 208/230 and 460 208/230 and 460 208/230 and 460 LOW RANGE Motor HP Motor Nominal RPM 1750 1750 Maximum Continuous BHP 5.37 / 5.75 5.75 Maximum Continuous Watts 4578 / 5115 5015...
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Page 9: Step 4 - Field Fabricate Ductwork
Roof Mount To operate at lower return-air temperatures, a field-supplied outdoor-air temperature control must be used to initiate both stages Check building codes for weight distribution requirements. Unit of heat when the temperature is below 45_F. Indoor comfort may operating weight is shown in Table 1. be compromised when these lower air temperatures are used with Installation Onto Curb insufficient heating temperature rise. -
Page 10: Step 6 - Install Flue Hood And Inlet Hood
ECONOMIZER HEAT EXCHANGER NOTE NOTE AIR OUT AIR OUT AIR IN NOTE: Do not drill in this area. Damage to basepan may result in water leak. C06279 Fig. 8 - - Air Distribution - - Concentric Duct Step 6 — Install Flue Hood and Inlet Hood Flue hood (smaller hood), inlet hood (larger hood), and screens are shipped inside the unit in the fan section. -
Page 11: Step 8 - Install Gas Piping
Support gas piping. For example, a -in. gas pipe must have one each unit size. Purchase these orifices from your local Carrier field-fabricated support beam every 8 ft. Therefore, an 18-ft long dealer. Follow instructions in accessory Installation Instructions to gas pipe would have a minimum of 3 support beams. -
Page 12: Step 10 - Make Electrical Connections
Field Control Wiring (Units Without Optional Humidi- - MiZert Adaptive Dehumidification System) Unit can be controlled with either a Carrier-approved accessory thermostat or a Carrier-approved space temperature sensor. Install thermostat according to the installation instructionsincluded with accessory. - Page 13 Fig. 15 - - Field Control Thermostat Wiring Units with the Humidi- -MiZer option receive a discrete input from a field- -installed device (such as from the Carrier humidistat or Thermidistat device). The discrete input is connected to the TB2...
- Page 14 THERMIDISTAT DEHUM HUMIDISTAT ROOFTOP UNIT C06295 Fig. 17 - - Field Control Thermidistat Wiring C07354 Fig. 18 - - Humidi- -MiZert Low- -Voltage Terminal Strip - - Humidity Sensor/Humidistat Wiring 48PM-C Humidi-MiZer C07346 Fig. 19 - - Third- -Party Smoke Detector on Humidi- -MiZer Units...
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Page 18: Step 11 - Install Outdoor Air Hood
Step 11 — Install Outdoor Air Hood NOTE: On units without economizers, the components are attached to the unit basepan. To access the components, remove the Perform the following procedure to install the outdoor-air hood on panel below the outdoor air intake section. units equipped with an economizer, two-position damper, or 4. -
Page 19: Step 12 - Position Optional Power Exhaust Or
11. Install the filter retainer track along the bottom edge of the 1. Remove 9 screws holding each damper assembly in place. outdoor air hood using 4 screws provided. (See Fig. 21.) (See Fig. 24.) Each damper assembly is secured with 3 screws on each side and 3 screws along the bottom. - Page 20 C06288 Fig. 25 - - Bracket and Hood Positioning Catalog No:48PM---2SI Copyright 2007 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 11/07 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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