50PG20---28
Single Package Rooftop Units
Electric Cooling with Electric Heat Option and
COMFORT
LINK
t
with 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
SAFETY CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step 1 -- Provide Unit Support
1
. . . . . . . . . . . . . . . . . . . . . . .
Step 2 -- Remove Shipping Rails
3
. . . . . . . . . . . . . . . . . . . . .
Step 3 -- Rig and Place Unit
3
. . . . . . . . . . . . . . . . . . . . . . . . .
Step 4 -- Field Fabricate Ductwork
9
. . . . . . . . . . . . . . . . . . . .
Step 5 -- Make Unit Connections
9
. . . . . . . . . . . . . . . . . . . . .
Step 6 -- Trap Condensate Drain
10
. . . . . . . . . . . . . . . . . . . . .
Step 7 -- Make Electrical Connections
10
. . . . . . . . . . . . . . . . .
Step 8 -- Install Outdoor--Air Hood
25
. . . . . . . . . . . . . . . . . . .
Step 9 -- Position Optional Power Exhaust or
Barometric Relief Damper Hood
25
. . . . . . . . . . . . . . . . . . . .
Step 10 -- Non--Fused Disconnect
27
. . . . . . . . . . . . . . . . . . . .
Step 11 -- Install All Accessories
27
. . . . . . . . . . . . . . . . . . . . .
Step 12 -- Configure Controls
27
. . . . . . . . . . . . . . . . . . . . . . .
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.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puron (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.
!
WARNING
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
IMPORTANT
: Units have high ambient operating limits. If limits
are exceeded, the units will automatically lock the compressor out
of operation. Manual reset will be required to restart the
compressor.
INSTALLATION
Step 1
—
Provide Unit Support
Roof Curb
Assemble or install accessory roof curb in accordance with
instructions shipped with this accessory. (See Fig. 1.) Install
insulation, cant strips, roofing, and counter flashing as shown.
Ductwork can be installed to roof curb before unit is set in place.
Ductwork must be attached to curb and not to unit. Curb must be
level. This is necessary to permit unit drain to function properly.
Unit leveling tolerance is
±
1
/
16
in. per linear ft in any direction.
Refer to Accessory Roof Curb Installation Instructions for
additional information as required. When accessory roof curb is
used, unit may be installed on class A, B, or C roof covering
material. Carrier roof curb accessories are for flat roofs or slab
mounting.
