II.
INSTALL ON A SOLID, LEVEL MOUNTING PAD
If conditions or local codes require the unit be attached to pad, tie
down 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. Consult Low-Ambient Guideline for wind baffle
construction.
NOTE:
Unit must be level to within
±
2° (
±
3/8 in./ft) per
compressor manufacturer specifications.
III.
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.
IV.
OPERATING AMBIENTS
The minimum outdoor operating ambient in cooling mode is 55°F,
and the maximum outdoor operating ambient in cooling mode is
125°F.
V.
REMOVE INDOOR CHECK-FLO-RATER® PISTON
AND REPLACE WITH TXV
CAUTION:
For proper unit operation and reliability, the
outdoor unit must be installed with the factory-supplied
balance port, hard shutoff TXV. Do not install with
evaporator coils having capillary tube metering devices.
After removing existing Check-Flo-Rater from indoor coil, install
factory-supplied thermostatic expansion valve (TXV) kit. (See Fig.
4.) The kit is shipped inside the unit’s compressor compartment. If
unit is installed with an FK4 or FC4 fan coil, no TXV change is
necessary since these fan coils are factory-equipped with proper
TXV.
Install TXV kit to indoor coil as follows:
1. Install suction tube adapter.
2. Install liquid flare-to-sweat adapter.
3. Install TXV on liquid flare-to-sweat adapter.
4. Connect external equalizer tube to fitting on suction tube
adapter.
5. Position sensing bulb on horizontal portion of suction tube
adapter. Secure using supplied hardware. Insulate bulb after
installation. (See Fig. 5.)
6. Check all connections for leaks.
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 structure
NOTE:
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
JOIST
1
″
MIN.
SUSPENSION
Fig. 3—Mounting Unit to Pad
DIMENSIONS (IN.)
UNIT
SIZE
MINIMUM
MOUNTING PAD
DIMENSIONS
TIEDOWN KNOCKOUT LOCATIONS
A
B
036, 048, 060
26 X 32
5-1/16
9-11/16
A97375
B
A
L
C
8
3
⁄
16
″
3
⁄
8
IN. DIA TIEDOWN
KNOCKOUTS
(2) PLACES
IN BASEPAN
Fig. 4—TXV Installed
A91277
THERMOSTATIC
EXPANSION
VALVE
EQUALIZER
TUBE
SENSING
BULB
COIL
—2—
