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48HJ004---007
48HE003---006
Single---P ackage Rooftop Heating/Cooling
Standard and L ow NOx Units
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS 1........................
INSTALLATION 1..................................
Step 1--Provide Unit Support 2.......................
ROOF CURB 2................................
SLAB MOUNT 2..............................
ALTERNATE UNIT SUPPORT 2.................
Step 2--Field Fabricate Ductwork 2...................
Step 3--Install External Trap for Condensate Drain 2.......
Step 4--Rig and Place Unit 2.........................
POSITIONING 4..............................
Step5—InstallFlueHood 4........................
Step 6 — Install Gas Piping 4........................
Step 7 — Make Electrical Connections 8................
FIELD POWER SUPPLY 8......................
FIELD CONTROL WIRING 8....................
HEAT ANTICIPATOR SETTINGS 8...............
Step 8 — Adjust Factory-Installed Options 17...........
COBRA ENERGY RECOVERY UNITS 17.......
HUMIDI-MIZER ADAPTIVE
DEHUMIDIFICATION SYSTEM 17..............
MANUAL OUTDOOR-AIR DAMPER 17..........
CONVENIENCE OUTLET 17....................
NOVAR CONTROLS 17........................
PREMIERLINK CONTROL 19.................
OPTIONAL ECONOMI$ER IV AND
ECONOMI$ER2 22............................
ECONOMI$ER IV STANDARD SENSORS 23......
ECONOMI$ER IV CONTROL MODES 24.........
Step 9 — Adjust Evaporator -Fan Speed 29..............
PRE--START--UP 45..................................
START--UP 45.......................................
SERVICE 50........................................
TROUBLESHOOTING 58.............................
START--UP CHECKLIST 63...........................
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, repair,
or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions 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 all brazing operations.
Recognize safety information. This is the safety --alert symbol
. When you see this symbol on the furnace and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and a mperage listed on the unit
rating plate.
!
WARNING