50HJ015,017
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ...................... 1
INSTALLATION ................................ 1-27
Step 1 -- Provide Unit Support ................... 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 -- Rig and Place Unit ..................... 4
• POSITIONING
• ROOF MOUNT
Step 3 -- Field Fabricate Ductwork ............... 4
Step 4 -- Make Unit Duct Connections ........... 7
Step 5 -- Trap Condensate Drain ................. 7
Step 6 -- Make Electrical Connections ........... 8
• 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 ................. 11
• MOTORMASTER® I CONTROL INSTALLATION
Step 10 -- Adjust Factory-Installed Options ..... 12
• PREMIERLINK TM CONTROL
• ENTHALPY SWITCH/RECEIVER
• OUTDOOR ENTHALPY CONTROL
• DIFFERENTIAL ENTHALPY CONTROL
• ENTHALPY SENSORS AND CONTROL
• OPTIONAL ECONOMISERIV AND ECONOMISER2
• ECONOMISERIV STANDARD SENSORS
• ECONOMISERIV CONTROL MODES
Step 11 -- Install Humidistat for
Optional MoistureMi$er TM Package ............ 25
START-UP ....................................... 28-34
Unit Preparation ................................. 28
Operating Sequence ............................ 33
SERVICE ........................................ 35-40
TROUBLESHOOTING ........................... 41-44
INDEX .............................................. 45
START-UP CHECKLIST ......................... CL-1
SAFETY CONSIDERATIONS
Installation and selwicing of air-conditioning equipment can
be hazardous due to system pressure and electric_d compo-
nents. Only trained and qualified service personnel should in-
stall, repaiL or service ai>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 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 _dl 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 mnbient temperature oper- ]
ating limits. If limits are exceeded, the unit will automati-
I
cally lock the compressor out of operation. Manual reset
will be required to restart the compressor:
INSTALLATION
Inspect unit for transportation &unage. If damage is found,
file claim with transportation agency.
Step 1 -- Provide Unit Support
ROOF CURB -- Asselnble and install accessory roof curb or
horizontal supply roof curb in accordance with instructions
shipped with the accessoq. Accesso U roof curb and horizontal
supply roof curb and information required to field fabricate a
roof curb or horizont_dsupply roof curb gueshown 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
horizontal supply roof curb is critical for a leakproof se_d.
Install gasket supplied with the roof curb or horizont_d sup-
ply roof curb as shown in Fig, 1. hnproperly applied gasket
can result in air leaks and poor unit performance.
Roof curb must be level. This is necessary to permit unit
drain to function properly. Unit leveling tolerance is + ]/]_in.
per linear ft in any direction. Refer to Accessory Roof Curb or
Horizontal Supply Roof Curb Installation Instructions for addi-
tional information as required.
ALTERNATE UNIT SUPPORT -- When the curb or a&tpter
cannot be used, support unit with sleepel_ using unit curb or
adapter support area. [f 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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500012-01 Printed in U.S.A. Form 50HJ-29SI Pg 1 3-06 Replaces: 50HJ-25SI
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