Carrier 50HJ015 - Manual

HEATING & COOLING
50HJ015,024
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Installation, Start-Up and Service
Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ........................................... 1
INSTALLATION ................................................................. 1-9
Step 1 — Provide Unit Support.......................................... 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit ............................................ 1
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork ............................... 6
Step 4 - Make Unit Duct Connections . . . .
6
Step 5 — Trap Condensate Drain...................................... 6
Step 6
— Make Electrical Connections .............................. 7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor-Air Inlet
Adjustments......................................................................... 8
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL FACTORY-INSTALLED
ECONOMIZER
Step 8 — Install Outdoor-Air Hood ................................... 8
START-UP....................................................................... 10-12
SERVICE ........................................................................... 12-16
START-UP CHECKLIST...................................................CL 1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com­
ponents. 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
personnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels at­
tached 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.
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
Step 1
INSTALLATION
Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
in accordance with instructions shipped with the curb.
Accessory roof curb and information required to field
fabricate a roof curb are shown in Fig I and 2. Install in­
sulation, cant strips, roofing, and counter flashing as shown.
Ductwork can be secured to roof curb before unit is set in
place.
IMPORTANT' The gasketing of the unit to the roof
curb is critical for watertightness Install gasket sup­
plied with the roof curb as shown in Fig. 1. Improp­
erly applied gasket can result in air leaks and poor
unit performance.
Curb should be level. This is necessary to permit unit
drain to function properly Unit leveling tolerance is
± Vi6 in. per linear ft in any direction. Refer to Accessory
Roof Curb Installation Instructions for additional informa­
tion as required.
ALTERNATE UNIT SUPPORT - When the curb cannot
be used, support unit with sleepers using unit curb support
area. If sleepers cannot be used, support long sides of unit
with a minimum of 3 equally spaced 4-in. x 4-in. pads on
each side.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transportation
agency. Keep unit upright, and do not drop. Use spreader
bars over unit to prevent sling or cable damage. Rollers
may be used to move unit across a roof. Level by using unit
frame as a reference; leveling tolerance is ± l/i6 in. per lin­
ear ft in any direction. See Fig. 1 for additional leveling
tolerance information. Unit weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3 Refer to rigging instructions on unit.
POSITIONING — Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4).
Do not install unit in an indoor location. Do not locate
air inlets near exhaust vents or other sources of contam­
inated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight dis­
tribution requirements.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
BookII PC 111 Catalog No 565-125 Printed in U S A. Form 50HJ-6SI Pg 1 12-93 Replaces: New
Tab 1b