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.
Arrange supporting members to adequately support unit and
minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
III.
CLEARANCE REQUIREMENTS
When installing, allow sufficient space for airflow, wiring, refrig-
erant 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. Place unit above a load-bearing wall and isolate unit and
tubing set from structure.
IV.
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.
V.
CHECK INDOOR CHECK-FLO-RATER® PISTON (IF
REQUIRED) OR ADD TXV
Check indoor coil piston to see if it matches the required piston
shown on outdoor unit rating plate. If it does not match, replace
indoor coil piston with piston shipped with outdoor unit. The
piston shipped with outdoor unit is correct for any approved indoor
coil combination.
NOTE:
If a TXV is to be installed on indoor unit, remove indoor
coil piston and follow Section VI.
VI.
INSTALL TXV
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.
A.
Installing TXV in Place of Piston
1. Pump system down to 2 psig and recover refrigerant.
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
3. Remove and discard factory-installed piston. Be sure Teflon
seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE:
If the piston is not removed from the body, TXV will not
function properly.
CAUTION:
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to the unit, use a brazing shield and
wrap TXV with wet cloth or use heat sink material.
5. Install TXV on indoor coil liquid line. Sweat swivel adapter
to inlet of indoor coil and attach to TXV outlet. Use backup
wrench to avoid damage to tubing or valve. Sweat inlet of
TXV, marked
″
IN
″
to liquid line. Avoid excessive heat
which could damage valve.
6. Install vapor elbow with equalizer adapter to suction tube of
line set and suction connection to indoor coil. Adapter has
a 1/4-in. male connector for attaching equalizer tube.
7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line using
clamps provided. Insulate bulb with field-supplied insula-
tion tape. See Fig. 4 for correct positioning of sensing bulb.
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 BASE
DIMENSIONS
TIEDOWN KNOCKOUT LOCATIONS
A
B
C
22-1/2 x 22-1/2
3-11/16
18-1/8
14-3/8
30 x 30
6-1/2
23-1/2
20
A94199
C
B
A
3
⁄
8
″
D. (9.53) TIEDOWN
KNOCKOUTS (2) PLACES
—2—
