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NOTE:
Avoid contact between tubing and structure
OUTDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1" MIN.
SUSPENSION
Fig. 2—Connecting Tubing Installation
Step 3—Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Common clearances are 6
in. on 1 side, 12 in. on 2 sides, and 30 in. on service side of unit.
Allow 24 in. between units. Discharge air must be unobstructed
and must not recirculate.
Position so snow, ice, or water 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.
Arrange supporting members to adequately support unit and
minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Step 4—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. The maximum outdoor operating ambient in heating mode
is 66°F.
Step 5—Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
In areas where prolonged freezing temperatures are encountered,
elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
Step 6—Check Defrost Thermostat
Check defrost thermostat to ensure it is properly located and
securely attached. There is a liquid header with a brass distributor
and feeder tube going into outdoor coil. At the end of 1 of the
INDOOR WALL
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
UNIT SIZE
38BYW024-060
A94028
Fig. 3—Mount Unit to Pad
feeder tubes, there is a 3/8-in. OD stub tube approximately 3 in.
long. (See Fig. 4.) The defrost thermostat should be located on stub
tube. Note that there is only 1 stub tube used with liquid header,
and on most units it is the bottom circuit.Metering Device
Step 7—Metering Device
NOTE: A thermostatic expansion valve (TXV) is required on all
38BYW units. Step 8 refers to installation of the TXV.
Fig. 4—Defrost Thermostat Location
2
"D. (9.53) TIEDOWN
3
⁄
8
KNOCKOUTS (2) PLACES
A
B
TIEDOWN KNOCKOUT
LOCATIONS
MIN. PAD
DIM. (IN.)
A
(In.)
30 X 30
6-1/2
23-1/2
FEEDER TUBE
C
A94199
B
C
(In.)
(In.)
20
STUB TUBE
DEFROST
THERMOSTAT
A97517
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