Installation guide

Table 1--Refrigerant Connections and Recommended Liquid- and Vapor=Tube Diameters (In.}
UMT
SiZE
0t8, 024
030, 036
042, 048
O6O
NOTES:
UQUID VAPOR VAPOR (LONG LBNE)
Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter
3/8 3/8 3/4 3/4 3/4 3/4
3/8 3/8 3/4 3/4 3/4 7/8
3/8 3/8 7/8 7/8 7/8 1-1/8
3/8 3/8 7/8 1-1/8 7/8 1-1/8
1. Tube diameters are for lengths up to 50 fl or 20 fi vertical differential For tubing lengths greater than 50 fl, consult Long Line section of the Application Guideline.
2. Do not apply capillary-tube indoor cells to these units.
To avoid equipment damage and/or loss of per%m_ance
remove indoor-coil piston if unit is to be installed on system
with a TXV=metering device.
Step 7--Check Defrost Thermostat
(heck defiost thermostat to ensure it is properly located arid
securely attached There is a liquid header with a brass distributor
arid feeder robe going into outdoor coil At the end of 1 of the
feeder tubes, there is a 3/%in OD. stub robe approximately 3 in.
tong. The det)ost thermostat should be located on stub tube. Note
that d-iere is only 1 stub tube used with liquid header, and on most
units it is the bottom circuit
Step 8--Make Piping Connections
Relieve pressure and recover all refiigerant be%re system
repair or final unit disposal to avoid personal injury or death.
Use all service ports arid open all flow-control devices,
including solenoid valves.
If ANY rekigerant tubing is burie& provide a 6 in. vertical
rise at service valve to avoid equipment damage Ret'rigerant
robing lengths up to 36 in may be buried without fk_rther
special consideration For lengths above 36 in, consult your
local distributor.
SWEAT CONNECTION
To avoid valve damage while brazing, service valves n-rest be
wrapped in a heat-sinking material such as a wet cloth,
2_
3,
Remove plastic retainer holding outdoor piston in liquid-
service valve.
Locate adapter robe shipped with unit.
Install strainer in adapter robe and connect robe to service
valve. (See Fig 5)
(onnect refiigerant tubing to fittings on outdoor-unit vapor-
and liquid=service valves
Service valves are closed fiom f_ctory and ready fbr brazing.
After wrapping service valve with a wet cloth, robing set can
be brazed to service valve using either silver-bearing or
non-silver=bearing brazing material Do not use soft solder
(material that melts below S00°F). Consult local code require-
nlents,
Refiigerant tubing and indoor coil are now ready for leak testing.
This check should include all field arid facto W joints.
PISTON
To prevent damage to unit or smaqce valves observe the
foilowing:
*'(!sea brazing shield.
*Wrap service valves with wet cloth or use a heat=sink
material.
Outdoor units may be connected to indoor section using accessory=
robing package or fMd-supplied refrigerant=grade robing of cot=
rect size and condition. For tubing requirements beyond 50 ft
length or 20 f_ vertical diffkrential, substantial capacity arid
per£_rmance losses can occur. Following the recommendations in
the Residential Split-System Long-Line Application Guideline
will reduce these losses. Refer to Table 1 for field=robing diam=
eters
REFRIGERANT TUBING
Connect robing to fittings on outdoor unit vapor- arid liquid=
smwice valves, (See Table 1) Lse refrigerant-grade robing Refer
to appropriate section below fbr type of service valves installed on
unit
PISTON
PISTON
RETAINER
STRAINER
SWEAT/FLARE ADAPTER
A97512
Fig. 5--Liquid-Service VNve with Sweat-Adapter
Tube
FINAL TUBING CHE(K
IMPORTANT: Check to be certain factow tubing on both indoor
and outdoor unit has riot shifted during shipment. Ensure robes are
not rubbing against each other or any sheet metal Pay close
attention to t'ceder robes, making sure wire ties on feeder robes are
secure and tight