H.C Duke & Son Freedom 360 Degrees 927CMT, Operator’S Manual With Illustrated Parts List

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INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
184617-02
6.2.1 Connecting Condenser Line Couplings
The refrigerant couplings that connect at
the freezer and condenser eliminate the
need for initial field charging. The coupling
design prevents air inclusion and refriger-
ant loss during connection. Follow these
installation procedures to insure leakproof
connections.
1. Remove protector caps and plugs and
examine the couplings for dirt or
foreign material. If necessary, care-
fully wipe coupling seats and threads
with a clean, dry cloth.
2. Lubricate male half diaphragm and
synthetic rubber seal with POE
refrigerant oil.
3. Thread the coupling halves together
by hand to insure proper mating of
threads. Use proper size wrenches
(on coupling body hex and on union
nut) and tighten until coupling bodies
“bottom” or definite resistance is felt.
4. Using a pencil or marker, mark a line
lengthwise from the coupling union
nut to the bulkhead panel. Then
tighten an additional ¼ turn (approxi-
mately 90°); the marked line rotation
on the coupling union nut will indicate
the amount the coupling has been
tightened. (See figure 6-3.) If a torque
wrench is used, the following torque
values are recommended:
3/8 in. OD liquid return line couplings:
20 ft-lbs.
1/2 in. OD discharge line couplings:
35 ft-lbs.
5. After connecting the condenser line
couplings at both the freezer and the
condenser, secure the condenser
lines to their permanent location with
U-type clamps.
6. Inspect all refrigerant tubing connec-
tions for leaks.
NOTE: The freezer is shipped with the service
valves backseated in the normal operating
position.
IMPORTANT:
Condensers are matched to the freezer. To
insure proper freezer refrigerant charge,
connect “A” side condenser to “A” side of
freezer making sure the serial numbers
match. If you have a double unit, make
sure “B” side condenser, freezer and serial
number also match. If this step is followed
then refrigerant does not need to be added
or removed at installation, or as the
seasons change. Refrigerant does not need
to be added or removed at installation, or
as seasons change. The freezer, condenser,
and line sets are factory charged with the
proper amount of refrigerant for all
ambient conditions and for either 25 ft. or
50 ft. line lengths. The total system charge
is 10.5 lb. of R404a. If a leak is found,
recover the refrigerant, repair the leak,
evacuate the system, and recharge with
10.5 lb. of R404a.
— continued
Figure 6-1 Line Connections
957CMT, 927CMT
917N-CMT