1
48HJ004---007
48HE003---006
Single---Package Rooftop Heating/Cooling
Standard and Low 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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 5 — Install Flue Hood
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 amperage listed on the unit
rating plate.
!
WARNING
