Carrier 50HG014-028 Installation Instructions Manual

CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 - Remove Shipping Rails . . . . . . . . . . . . . . . . 3
Step 3 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 3
• POSITIONING
• ROOF MOUNT
• INSTALLATION ONTO CURB
Step 4 - Field Fabricate Ductwork . . . . . . . . . . . . . . . 8
Step 5 - Make Unit Duct Connections . . . . . . . . . . . 8
Step 6 - Trap Condensate Drain . . . . . . . . . . . . . . . . . 9
Step 7 - Make Electrical Connections . . . . . . . . . . . 9
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 8 - Install Outdoor-Air Hood . . . . . . . . . . . . . . 20
Step 9 - Position Optional Power Exhaust
or Barometric Relief Damper Hood. . . . . . . . . . . . 22
Step 10 - Non-Fused Disconnect. . . . . . . . . . . . . . . 22
Step 11 - Install All Accessories . . . . . . . . . . . . . . . 23
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 replacing filters. All other operations should
be performed by trained service personnel. 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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Book 1 4
Tab 1b 6b
Electric Cooling with Electric Heat Option

Installation Instructions

Page
Catalog No. 535-00092 Printed in U.S.A.
Single Package Rooftop Units
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.
IMPORTANT: Units have high ambient operating lim-
its. If limits are exceeded, the units will automatically
lock the compressor out of operation. Manual reset will
be required to restart the compressor.
INSTALLATION
Step 1 - Provide Unit Support
ROOF CURB - Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1. Install insulation, cant strips, roofing, and counter flash-
ing as shown. Ductwork can be installed to roof curb before
unit is set in place. Curb must be level. This is necessary to
permit unit drain to function properly. Unit leveling tolerance is
1
± / in. per linear ft in any direction. Refer to Accessory
16
Roof Curb Installation Instructions for additional information
as required. When accessory roof curb is used, unit may be
installed on class A, B, or C roof covering material.
IMPORTANT: The gasketing of the unit to the roof curb
is critical for a watertight seal. Install gasket with the
roof curb as shown in Fig. 1. Improperly applied gasket
can also result in air leaks and poor unit performance.
ALTERNATE UNIT SUPPORT - When a curb cannot be
used, install unit on a noncombustible surface. Support unit
with sleepers, using unit curb support area. If sleepers cannot
be used, support long sides of unit with a minimum of 3 equal-
ly spaced 4-in. x 4-in. pads on each side.
Form 50HG-7SI Pg 1
50HG014-028
11-03 Replaces: 50HG-3SI