Pub. No. 11-BC08D1-7
PAGE 3
INSTALLER'S GUIDE
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to vi-
bration transmission from the refrigerant lines, the following
precautions should be taken:
a. When the refrigerant lines have to be fastened to floor joists
or other framing in a structure, use isolation type hangers.
b. Isolation hangers should also be used when refrigerant
lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant lines run through a wall or sill, they
should be insulated and isolated.
d. Isolate the lines from all ductwork.
D. SErvICE vALvE OPErATION
BrASS LIqUID AND GAS LINE SErvICE vALvES
The Brass Liquid and Gas Line Service Valves are factory shipped
in the seated position to hold factory charge. The pressure tap
service port (when depressed) opens only to the field brazing side
of the valve when the valve is in the seated position. The liquid
line valve is
not
a back seating valve (see
WArNING
below).
▲
wARNING:
Extreme caution should be
exercised when opening the Liquid and Gas Line Service
valves. Turn valve stem counterclockwise only until the
stem contacts the rolled edge. (See Figures 3 and 5) No
torque is required.
BrASS GAS LINE BALL SErvICE vALvE
The Brass Gas Line Ball Service Valve is shipped in the closed
position to hold the factory refrigerant charge. The pressure tap
service port (when depressed) opens only to the field brazing side
when the valve is in the closed position.
cAP
1/4 TURN oNLy
coUNTERcLockwISE
foR fULL oPEN
PoSITIoN
vALvE STEM
GAS LINE coNNEcTIoN
UNIT SIDE
of vALvE
cAP
boDy
cooLING
coRE
PRESSURE TAP PoRT
HEATING
GAS LINE bALL SERvIcE vALvE
The Gas Line Service Valve is full open with a 1/4 turn. See
Figure 4.
BrAzING rEFrIGErANT LINES
1. Remove lower access cover to access service valves.
2. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surfaces of stub tubes prior
to brazing.
3. Cut and fit tubing, minimizing the use of sharp 90° bends.
4. Insulate the entire gas line and its fittings.
5. Do
NOT
allow uninsulated liquid line to come in direct contact
with bare gas line.
6. Precautions should be taken to avoid heat damage to
the pressure tap valve core during brazing. It is recom-
mended that the pressure tap port valve core be removed
and a wet rag wrapped around the valve body.
NOTICE:
Use care to make sure that no moisture enters pressure
tap port, while wet rag is being used.
NOTICE:
Precautions should be taken to avoid heat damage
to basepan during brazing. It is recommended to keep the flame
directly off of the basepan.
7. Use a Dry Nitrogen Purge and Brazing Alloy without flux
when brazing the field line to the copper factory connection.
Flow dry nitrogen into either valve pressure tap port, thru the
tubing and out the other port while brazing.
8. Braze using accepted good brazing techniques.
LEAk ChECk
IMPOrTANT:
Replace pressure tap port valve core before at-
taching hoses for evacuation.
After the brazing operation of refrigerant lines to both the outdoor
and indoor unit is completed, the field brazed connections must
be checked for leaks. Pressurize through the service valve ports,
the indoor unit and field refrigerant lines with dry nitrogen to
350-400 psi. Use soap bubbles or other leak-checking methods
to see that all field joints are leak-free! If not,
release pres-
sure
; then repair!
SySTEM EvACUATION
NOTE: Since the outdoor unit has a refrigerant charge, the gas
and liquid line valves must remain closed.
1. Upon completion of leak check, evacuate the refrigerant lines
and indoor coil before opening the gas and liquid line valves.
4
5
GAS LINE SERvIcE vALvE
