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Catalog No. 04-53480079-01 Printed in U.S.A. Form 48P-4SI Pg 1 11-10 Replaces: 48P-3SI
Installation Instructions
CONTENTS
Page
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . .1,2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68
Step 1 — Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 2 — Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 3 — Roof Mount Unit. . . . . . . . . . . . . . . . . . . . . . . . 2
Step 4 — Slab Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 5 — Install Curb Gasketing. . . . . . . . . . . . . . . . . . 2
Step 6 — Install Field-Fabricated Ductwork . . . . . . 2
Step 7 — Rig Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 8 — Connect Condensate Drain. . . . . . . . . . . . 16
Step 9 — Install Outdoor Hoods (Units without
Optional High-Capacity Power Exhaust). . . . . . 32
• UNIT SIZES 030-050
• UNIT SIZES 055-100
Step 10 — Install Economizer Hoods (Units with
Optional High-Capacity Power Exhaust). . . . . . 33
• INSTALL SMALL HOODS
• INSTALL LARGE HOODS
Step 11 — Route Field Wiring . . . . . . . . . . . . . . . . . . . 35
• UNIT SIZES 030-060
• UNIT SIZES 070-100
Step 12 — Make Field Electrical Connections . . . 35
•POWER WIRING
Step 13 — Connect Air Pressure Tubing . . . . . . . . 58
• VARIABLE FRQUENCY DRIVE
• MODULATING POWER EXHAUST
• RETURN FAN POWER EXHAUST
Step 14 — Remove Supply-Fan Shipping
Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Step 15 — Remove Optional Return-Fan
Shipping Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Step 16 — Connect Gas Piping. . . . . . . . . . . . . . . . . . 61
Step 17 — Configure Optional Staged Gas
Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Step 18 — Install Flue/Inlet Hoods and Baffles . . 62
Step 19 — Install Supply-Air Thermistors
(Staged and Modulating Gas Units Only) . . . . . 62
Step 20 — Install Optional Motormaster
®
V
Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Step 21 — Install Unit Accessories . . . . . . . . . . . . . . 68
CONTROLS INSTALLATION . . . . . . . . . . . . . . . . . . 68-76
Constant Volume Units. . . . . . . . . . . . . . . . . . . . . . . . . . 68
• CONTROL WIRING
Variable Air Volume (VAV) Units . . . . . . . . . . . . . . . . . 68
Optional and Accessory Control Wiring . . . . . . . . . 68
Carrier Comfort Network
®
(CCN) Interface. . . . . . . 73
Optional UPC Open Installation . . . . . . . . . . . . . . . . . 74
Smoke Control Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . 74
GENERAL
This installation instruction contains basic unit installation
information, including installation of thermostats and remote
temperature sensors.
For additional information and service instructions, refer to
the Controls and Troubleshooting literature.
A factory-installed optional integral economizer and high-
capacity power exhaust is available on size 075-100 units.
A factory-installed optional return fan is available on size
075-100 units.
The staged gas control (SGC) option adds the capability to
control the rooftop unit’s gas heating system to a specified
supply-air temperature set point for purposes of tempering a
cool mixed-air condition.
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 labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes, including ANSI (American Nation-
al Standards Institute) Z223.1. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguisher available for all brazing operations.
WARNING
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance. Do not touch any electri-
cal switch; do not use any phone in your building. Immedi-
ately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions. If you cannot reach
your gas supplier, call the fire department.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
WARNING
Improper installation, adjustment, alteration, service, or
maintenance can cause injury or property damage. Refer to
this manual. For assistance or additional information, con-
sult a qualified installer, service agency, or the gas supplier.
WEATHERMASTER
®
48P2,P3,P4,P5030-100
Single Package Gas Heating and Electric Cooling Units
with Direct Spark Ignition and COMFORTLINK™ Controls