Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS .................. 1
INSTALLATION ............................ 1-15
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 ........... 7
Step 4 — Make Unit Duct Connections ....... 7
Step5—TrapCondensate Drain ............ 7
Step 6 — Make Electrical Connections ....... 8
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor-Air Inlet
Adjustments ...............................11
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL ECONOMIZER
Step 8 — Install Outdoor-Air Hood ...........12
Step 9 — Install All Accessories .............12
• MOTORMASTERt I CONTROL INSTALLATION
• MOTORMASTER III CONTROL INSTALLATION
START-UP ................................15-20
SERVICE ..................................20-27
TROUBLESHOOTING ........................28
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, ob-
serve 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 ex-
tinguishers 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 unit 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 and install accessory roof curb
or horizontal adapter roof curb in accordance with instruc-
tions shipped with the curb or horizontal adapter. Accessory
roof curb and horizontal adapter roof curb and information
required to field fabricate a roof curb or horizontal adapter
roof curb are shown in Fig. 1 and 2. Install insulation, 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 or adapter roof curb is critical for a leak-proof
seal. Install gasket supplied with the roof curb or adapter
roof curb as shown in Fig. 1. Improperly applied gas-
ket can result in air leaks and poor unit performance.
Curb or adapter roof curb should be level. This is neces-
sary to permit unit drain to function properly. Unit leveling
tolerance is 6
1
⁄
16
in. per linear ft in any direction. Refer to
Accessory Roof Curb or Horizontal Adapter Roof Curb In-
stallation Instructions for additional information as required.
ALTERNATE UNIT SUPPORT — When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter 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 trans-
portation 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 6
1
⁄
16
in. per linear ft in any
direction. See Fig. 3 for additional 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 and 5).
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 distri-
bution requirements.
50TJ016-028
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
Tab 1b
PC 111 Catalog No. 565-135 Printed in U.S.A. Form 50TJ-14SI Pg 1 10-98 Replaces: 50TJ-13SI
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