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All outdoor unit and indoor coil connections are copper-to-cop-
per and should be brazed with a phosphorous-copper alloy
material such as Silfos-5 or equivalent. DO NOT use soft
solder.
See Table 4 for additional refrigerant line charge
The lines should be installed so that they will not obstruct
service access to the coil, air handling system or filters. Install
the lines with as few bends as possible.
Care must be taken not to damage the couplings or kink the
tubing. Care must also be used to isolate the refrigerant lines
to minimize noise transmission from the equipment to the
structure.
Tape and suspend the refrigerant lines as shown in Figure 8.
DO NOT allow metal-to-metal contact.
Use PVC piping as detailed in Figure 9 as a conduit for all
underground installations. Buried lines should be kept as short
as possible to minimize the buildup of liquid refrigerant in the
vapor line during long periods of shutdown.
Pack fiberglass insulation and a sealing material such as
permagum around refrigerant lines where they penetrate a wall
to reduce vibration and to retain some flexibility.
Do not install a filter drier since one is factory installed in the
outdoor unit.
Insulate all vapor lines with a minimum of 1/2" foam rubber.
Liquid lines that will be exposed to direct sunlight and/or high
temperature must also be insulated.
SHUT-OFF VALVE CONNECTION PRECAUTIONS
Precautions should be taken to prevent heat damage to the
fitting by wrapping a wet rag around it as shown in Figure 10.
Also, protect all painted surfaces and insulation during brazing.
After brazing, cool the joint with a wet rag.
LINE INSTALLATION
Install the refrigerant lines using the following procedure.
1. Remove the cap and Schrader core from both the liquid
and vapor fitting service ports at the outdoor unit. Connect
low pressure nitrogen to the liquid line service port.
2. Braze the liquid line to the liquid fitting at the outdoor unit.
Be sure to wrap the fitting body with a wet rag. Allow the
nitrogen to continue flowing. Do not braze the vapor fitting
at this time.
3. Remove pressure from indoor coil through the Schrader
fitting on the liquid connection. Remove fitting and discard
4. Braze the liquid line to the indoor coil liquid connection. The
nitrogen should now be flowing through the coil.
5. Unbraze cap on vapor line. The line is 3/4" OD tubing and
will require that tube be beveled to 3/4" ID, or swedge vapor
line to fit inside vapor connection. Braze the vapor line to
the indoor coil vapor connection. After the connection has
cooled, replace the grommet.
6. At the outdoor unit, protect the vapor fitting with a wet rag
and braze the vapor line connection. The nitrogen flow
should be exiting the system from the vapor service port
connection. After this connection has cooled, remove the
nitrogen source from the liquid fitting service port.
7. Evacuate the vapor line, indoor coil and the liquid line.
Refer to “EVACUATION” in this instruction.
8. Leak test all refrigerant piping connections including the
service port flare caps to be sure they are leak tight. DO
NOT OVERTIGHTEN (between 40 and 60 inch/lbs maxi-
mum).
9. Do not remove the flare caps from the service ports except
when necessary for servicing the system.
FIGURE 9 - UNDERGROUND INSTALLATION
LIQUID
LINE
TAPE
SHEET
METAL
HANGER
INSULATED
VAPOR LINE
1/2" (ARMAFLEX
OR EQUIVALENT
)
FIGURE 8 - TUBING HANGER
TO INDOOR COIL
TO OUTDOOR UNIT
LIQUID LINE
CAP
PVC
CONDUIT
INSULATED
VAPOR LINE
WET RAG PROTECTS
BASE VALVE
FIGURE 10 - HEAT PROTECTION
WARNING: Coil is under 35 psig pressure.
NOTE: Do not use the system refrigerant in the outdoor
unit coil to purge or leak test.
515.35-N6Y
6
Unitary Products Group
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