Page 22
MS8C / MS8H (208-230V)
CLUTCH TYPE
WING NUT TYPE
FLARING TOOLS
FIGURE 36
APPLY REFRIGERANT
LUBRICANT HERE
2-WAY LARGE LINE
SERVICE PORT
A
B
TYPICAL LINE SET CONNECTION TO
OUTDOOR UNIT
FIGURE 37
CONNECTING LINE SET TO OUTDOOR UNIT
1. Apply a sealing cap or water-proof tape to prevent dust
or water from getting into the refrigerant piping before
it is connected.
2. Apply refrigerant lubricant to the matching surfaces of
the flared line set and union before connecting them
together (figure 37 --
A
). This will reduce refrigerant
leaks.
3. Align the flared refrigerant line with valve connection,
then tighten the flare nut lightly at first to obtain a
smooth match (figure 37 -
B
).
4. Tighten flare nuts. Do not over-tighten a flared joint.
Once snug, continue another half turn on each nut.
That should provide a gas-tight joint. You may also use
a torque wrench to tighten nuts using table 10
recommendations.
CONNECTING LINE SET BETWEEN INDOOR AND
OUTDOOR UNITS
1. Apply a sealing cap or water-proof tape to prevent dust
or water from getting into the refrigerant piping before
it is connected.
2. Apply refrigerant lubricant to the matching surfaces of
the flared line set and union before connecting them
together (figure 38 --
A
).
3. Align the union tube and flared refrigerant line with
each other, then tighten the flare nut lightly at first to
obtain a smooth match (figure 38 --
B
).
A
B
APPLY REFRIGERANT
LUBRICANT HERE
MALE FLARE CONNECTION
MAKING CONNECTIONS AT INDOOR UNIT
(MALE TO FEMALE CONNECTION)
FIGURE 38
4. Tighten flare nuts. Do not over-tighten a flared joint.
Once snug, continue another half turn on each nut.
That should be a leak-free joint. You may also use a
torque wrench to tighten nuts using table 10
recommendations.
TORQUE
WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
TIGHTEN FLARE NUT
FIGURE 39
The line set between the indoor and outdoor unit must be
leak tested and evacuated to remove any non-
condensables and moisture from the system.
Leak Test and Evacuation
Air and moisture remaining in the refrigerant system will
have undesirable effects as indicated below:
*
Pressure in the system rises
*
Operating current rises
*
Cooling or heating efficiency drops
* Moisture
in
the refrigerant circuit may freeze and block
capillary tubing (-30 size only)
* Water
may lead to corrosion of parts in the refrigeration
system
The line set between the indoor and outdoor unit must be
leak tested and evacuated to remove any non-
condensables and moisture from the system.
LEAK TEST
1. Connect the manifold gauge set and dry nitrogen gas
cylinder to the large line service port as illustrated in
figure 40.
2. Pressurize the system to no more than 150 PSIG with
dry nitrogen. Check for leaks using soapy water.
3. After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose
