1-8
TO THE INSTALLER
Models 345, 346, 349, 355 NPR
To the Installer
1
Remote Condenser Installation
1. Install refrigeration lines from the freezer to the
condenser assemblies. Do not create oil traps.
2. Normally, any straight run of tubing must be
supported near each end of the run. Long runs
require additional supports. As a guide, 3/8 in. to 3/4
in. copper should be supported every 5 ft. (1.52 m).
When changing directions, no corner should be left
unsupported. Supports should be placed a maximum
of 2 ft. (0.61 m) in each direction from the corner. If
soft copper tubing is used, make sure it is not kinked
or flattened. If hard drawn copper tubing is used, use
only long radius elbows.
3. Braze the quick-connect/disconnect couplings and
access tees on the freezer end of the refrigeration
lines. The couplings and access tees are supplied
with the freezer or condenser assembly.
4. Braze the supplied quick-connect/disconnect
couplings on the condenser assembly end of the
refrigeration lines. The couplings are supplied with
the condenser assembly.
Note: Wrap a wet cloth around the brass coupling
bodies to prevent heat damage to the seal.
5. Test the field-constructed lines for leaks.
6. Evacuate the field-constructed refrigerant lines using
the access fittings brazed on the freezer end of the
refrigeration lines.
7. When the evacuation process is complete, relieve
the vacuum with 4 oz. (113 g) HP62 refrigerant per
line, for a total of 8 oz. (227 g). This procedure will
prevent moisture contamination during freezer and
condenser assembly connection and will complete
the total charge.
Remote Condenser Refrigeration
Connections
Connect the refrigerant line quick-connect/disconnect
(QD) couplings to the mating (QD) couplings on the
condenser assembly by performing
step 1 through
step 6. When complete, repeat the instructions to
connect the couplings on the freezer.
1. Remove the shipping caps from the
quick-connect/disconnect coupling on the condenser
assembly.
2. Thoroughly clean and lubricate the mating surfaces
of the quick-connect/disconnects.
Note: Use polyolester oil to lubricate the surfaces.
3. Manually thread the coupling halves together to
ensure proper mating of the threads.
4. Using properly sized wrenches, tighten the coupling
halves until the round, flat surfaces of inner coupling
bodies completely depress one another.
5. Once the flat surfaces are completely depressed,
tighten the couplings an additional 1/4 turn. This step
is necessary to ensure that the knife edge of the seal
seats into the brass seat of the coupling halves,
forming a leak-proof joint (metal seal).
Figure 1-8
6. Check all connections for leaks.
Repeat step 1 through step 6 to connect the
refrigerant line QD couplings to the mating QD
couplings on the freezer.
To Next Page
Loading...