Carrier 50HG014-028- User Manual
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Table of Contents:
- Page 2 – Fig. 1 — Roof Curb Details
- Page 3 – SHIPPING RAILS; Fig. 2 — Shipping Rail Removal
- Page 4 – Fig. 3 — Rigging Details
- Page 5 – Fig. 4 — Base Unit Dimensions
- Page 6 – Table 1 — Physical Data
- Page 8 – Fig. 5 — Alignment Hole Details
- Page 9 – Fig. 9 — Concentric Duct Details
- Page 10 – LEGEND AND NOTES FOR TABLES 2A AND 2B
- Page 11 – ELECTRIC HEAT BRANCH CIRCUIT FOR 208/240-V 75-kW ELECTRIC HEAT
- Page 15 – Table 2B — Electrical Data (Units With Optional Convenience Outlet)
- Page 20 – Step 8 — Install Outdoor Air Hood —; EQUIP —
- Page 21 – Fig. 16 — Outdoor Air Hood Details
- Page 22 – Step 10 — Non-Fused Disconnect —
- Page 23 – Step 11 — Install All Accessories —; Fig. 20 — Bracket and Hood Positioning
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 535-00092
Printed in U.S.A.
Form 50HG-7SI
Pg 1
11-03
Replaces: 50HG-3SI
Book 1
4
Tab
1b 6b
Installation Instructions
CONTENTS
Page
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.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
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
/
16
in. per linear ft in any direction. Refer to Accessory
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.
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.
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.
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.
50HG014-028
Single Package Rooftop Units
Electric Cooling with Electric Heat Option
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Summary
3 Step 2 — Remove Shipping Rails — Remove ship- ping rails prior to lowering unit onto roof curb. See Fig. 2. Therails are attached to the unit at both the return end and condens-er end. Remove the screws from both ends of each rail. Becareful not to drop the rails onto any surface that could be dam...
