coil or fan coil units. Always use a filter drier on burnout unit
replacements.
INSTALLATION
Step 1—Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton, taking care not to damage
unit.
INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit service
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
Step 2—Install On A Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad,
tiedown bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to determine base pan size and knockout hole location.
On rooftop applications, mount on level platform or frame. Place
unit above a load bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require
wind baffles to achieve adequate defrost. Consult Low Ambient
Guideline for wind baffle construction.
NOTE: Unit must be level to within ± 2° (± 3/8 in./ft) per
compressor manufacturer specifications.
Step 3—Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a 6-in.
clearance on 1 side of unit and 12 in. on all remaining sides must
be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
On rooftop applications, locate unit at least 6 in. above roof
surface.
Step 4—Operating Ambient
The minimum outdoor operating ambient in cooling mode is 55°F,
and the maximum outdoor operating ambient in cooling mode is
125°F. The maximum outdoor operating ambient in heating mode
is 66°F.
Step 5—Install TXV
NOTE: Applies to non-TXV indoor units only. If installing a
rated and approved indoor coil without a factory installed R-22
TXV, remove and replace the fixed orifice or Puron TXV
expansion device with an R-22 TXV.
The thermostatic expansion valve is specifically designed to
operate with R-22. Do not use a Puron TXV. An existing Puron
TXV must be replaced with a factory approved TXV specifically
designed for R-22. Refer to Product Data Digest for the appropri-
ate TXV kit number.
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
For proper unit operation and reliability, units must be
installed with field supplied hard shutoff TXV. Do not install
with evaporator coils having capillary tube metering devices
or pistons.
IMPORTANT: If not factory installed, the TXV should be
mounted as close to the indoor coil as possible and in a vertical,
upright position. Avoid mounting the inlet tube vertically down.
Valve is more susceptible to malfunction due to debris if inlet tube
is facing down. A factory approved filter drier must be installed in
the liquid line.
INSTALLING TXV IN PLACE OF PISTON
1. Pump system down to 2 psig and recover refrigerant.
Fig. 2—Connecting Tubing Installation
A94028
INSULATION
VAPOR TUBE
LIQUID TUBE
OUTDOOR WALL INDOOR WALL
LIQUID TUBE
VAPOR TUBE
INSULATION
CAULK
Avoid contact between tubing and structureNOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1″ (25.4 mm)MIN.
SUSPENSION
Fig. 3—Mounting Unit to Pad
Dimensions (In.)
MINIMUM
MOUNTING-PAD
DIMENSIONS
TIEDOWN KNOCKOUT LOCATIONS
AB C
26x26 9-1/8 4-7/16 21-1/4
31-1/2 x 31-1/2 9-1/8 6-9/16 24-11/16
35x35 9-1/8 6-9/16 28-7/16
A05177
B
C
3/8-IN. DIA TIEDOWN
KNOCKOUTS IN
BASEPAN (2) PLACES
A
2
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