Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 535-00127 Printed in U.S.A. Form 50HJQ-15SI Pg 1 3-06 Replaces: 50HJQ-8SI
Book 1 4
Tab 5a 5a
Installation, Start-Up
and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS......................1
INSTALLATION ................................ 1-24
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...............3
Step 4 — Make Unit Duct Connections ...........7
Step 5 — Trap Condensate Drain.................7
Step 6 — Make Electrical Connections ...........7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• OPTIONAL NON-FUSED DISCONNECT
• OPTIONAL CONVENIENCE OUTLET
Step 7 — Make Outdoor-Air Inlet Adjustments ..10
• MANUAL OUTDOOR-AIR DAMPER
Step 8 — Install Outdoor-Air Hood ..............10
Step 9 — Install All Accessories.................10
• MOTORMASTER® I CONTROL INSTALLATION
Step 10 — Adjust Factory-Installed Options.....12
• PREMIERLINK™ CONTROL
• ENTHALPY SWITCH/RECEIVER
• OUTDOOR ENTHALPY CONTROL
• DIFFERENTIAL ENTHALPY CONTROL
• ENTHALPY SENSORS AND CONTROL
• OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2
• ECONOMI$ERIV STANDARD SENSORS
• ECONOMI$ERIV CONTROL MODES
Step 11 — Set Defrost Cycle ....................24
START-UP .................................... 24-31
SERVICE ..................................... 31-37
TROUBLESHOOTING......................... 38-43
INDEX...........................................44
START-UP CHECKLIST ........................CL-1
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 personnel.
When working on air-conditioning equipment, observe precau-
tions 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 extinguisher available for all brazing operations.
INSTALLATION
Step 1 — 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. 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. Horizontal adapter installa-
tion is shown in Fig. 2.
Curb should be level. This is necessary to permit unit drain
to function properly. Unit leveling tolerances is ±
1
/
16
in. per
linear ft in any direction. Refer to Accessory Roof Curb Instal-
lation Instructions for additional information 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 mini-
mum 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 ±
1
/
16
in. per linear 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.
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 limits. If
limits are exceeded, the unit 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 watertight seal. Install gasket supplied with the
roof curb as shown in Fig. 1. Improperly applied gasket can
result in air leaks and poor unit performance.
50HJQ014,016
Single-Package Rooftop
Heat Pump Units
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