30
HIGH PRESSURE CUTOUT REPLACEMENT
A.
With the suction and discharge ports open, braze
the capillary tube to the discharge line.
C.
Replace the drier per the instructions in Section
5.9.
D.
Braze bulb into place on suction line.
E.
Evacuate the system per the instructions in Section
5.2.
F.
Recharge the system per the instructions in Section
5.3.
G.
Connect the terminals to the high pressure cutout.
H.
Attach the high pressure cutout using the two
screws with star washers.
D. HOT GAS BYPASS
The hot gas bypass valve is installed parallel to the
compressor and helps to regulate the compressor tempera-
ture (Refer to Figure 5-7). When the cab evaporator is the
only part of the system requiring refrigerant, the bypass
valve will allow discharge gas to bypass into the suction line
to prevent liquid refrigerant from entering the compressor.
HOT GAS BYPASS ADJUSTMENT
Adjustment to the hot gas bypass must be made when the
hopper refrigeration is the only part of the system running.
NOTE
Before adjusting the hot gas bypass, check the EPR
valve and adjust if necessary.
A.
Turn the Main Power OFF/ON switch and both
Freezing Cylinder OFF/ON switches to the OFF
position.
NOTE
If the machine does not have a Main Power switch,
turn the right side Freezing Cylinder switch OFF and
listen to make sure the left freezing cylinder is not
calling for refrigeration.
B.
Connect a gauge to the Schrader valve on the
suction line next to the compressor.
C.
Wait until the gauge stops moving.
D.
Unscrew the seal cap from the top of the valve.
E.
Using a 5/16” Allen wrench, adjust the valve
counterclockwise to decrease pressure and
clockwise to increase pressure. (Refer to Figure 5-
8)
NOTE
Each 360° turn will change the pressure about 6 psig.
F.
Adjust the hot gas bypass valve to 14 psig ±1.
G.
Wait 2 minutes to ensure pressure remains stable.
H.
Hand-tighten seal cap to valve.
HOT GAS BYPASS REMOVAL
A.
Remove the left side panel and the front panel.
B.
Recover refrigerant charge per instructions in
Section 5.2.
C.
Remove insulation around hot gas bypass and
tubing.
D.
Leave the suction and discharge ports open to
prevent pressure buildup during hot gas bypass
removal.
E.
Apply a heat sink (wet cloth) to the hot gas bypass.
F.
Unsweat the hot gas bypass and remove.
Figure 5-7 Hot Gas Bypass
Figure 5-8 Hot Gas Bypass Adjustment
Summary of Contents for Stoelting E131-OT2
Page 1: ...Model E131 OT2 F131 OT2 SERVICE MANUAL Manual No 513648 Rev 0 https appliancetechmanuals com ...
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Page 60: ...54 8 9 REFRIGERATION DIAGRAM WIRING DIAGRAM 01 2 3 3 3 3 https appliancetechmanuals com ...