48PM20---28
Single Package Rooftop Units
Electric Cooling/Gas Heating with
COMFORT
Link
t
Controls and PURON
R
(R---410A) Refrigerant
Installation Instructions
IMPORTANT
: This installation instruction contains basic unit
installation information including installation of field control
devices. For information on unit start-up, service, and operation,
refer to the unit Controls, Start-Up, Operation, Service, and
Troubleshooting Instructions also enclosed in the unit literature
packet.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 1 -- Provide Unit Support
2
. . . . . . . . . . . . . . . . . . . . . . . . .
Step 2 -- Remove Shipping Rails
2
. . . . . . . . . . . . . . . . . . . . . . .
Step 3 -- Rig and Place Unit
2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 4 -- Field Fabricate Ductwork
9
. . . . . . . . . . . . . . . . . . . . . .
Step 5 -- Make Unit Duct Connections
9
. . . . . . . . . . . . . . . . . . .
Step 6 -- Install Flue Hood and Inlet Hood
10
. . . . . . . . . . . . . . .
Step 7 -- Trap Condensate Drain
10
. . . . . . . . . . . . . . . . . . . . . .
Step 8 -- Install Gas Piping
11
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 9 -- Orifice Change
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 10 -- Make Electrical Connections
12
. . . . . . . . . . . . . . . . .
Step 11 -- Install Outdoor--Air Hood
18
. . . . . . . . . . . . . . . . . . .
Step 12 -- Position Optional Power Exhaust or
Barometric Relief Damper Hood
19
. . . . . . . . . . . . . .
Step 13 -- Non--Fused Disconnect
19
. . . . . . . . . . . . . . . . . . . . .
Step 14 -- Install All Accessories
19
. . . . . . . . . . . . . . . . . . . . . .
Step 15 -- Configure Controls
19
. . . . . . . . . . . . . . . . . . . . . . . .
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 the basic maintenance functions
of 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 result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch.
!
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injury
or equipment damage.
Puron
r
(R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puron refrigerant
equipment.
CAUTION
!
