Vogt P-24AL, Руководство по обслуживанию

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P24AL & P34AL Service Manual
SERVICING OPERATIONS
12/2016
9-22
Repair or replace as follows:
1.
With the receiver pressure higher than the freezer pressure close the hand stop valve (58) and
(29) (upstream and downstream) in the liquid line between the receiver and liquid feed solenoid
valve.
2. Manually open (screw stem in until only 1/8” protrudes) and allow the liquid to flow to the
freezer and clear this part of the line of liquid, leaving only vapor.
3. Close the other hand stop valve (29) (downstream). This will isolate the solenoid valve.
4. Purge the remaining ammonia from this line through the strainer purge valve (75).
5. Repair or replace the valve as needed, making sure all connections are tight.
6. Evacuate or purge air from this isolated part of the liquid line through the strainer purge valve.
7. After purging, manually close (screw stem out) the solenoid valve and open stop valves (29) and
(58), check for leaks.
Figure 9-8
Liquid Line Solenoid Valve
Thaw Chamber Check Valve (101) Fig. 9-9. This valve is closed during the freeze cycle to keep
the thaw chamber from filling with liquid ammonia. To manually open simply turn the manually
opening stem inward. Repair or replace as follows:
1.
Pump the machine completely down with check valve in the manually open.
2. Shut the thaw gas hand valve (90).
3. Vent additional ammonia vapors from oil trap drain valve (61).
4. Replace or repair valve.
5. Shut oil trap drain valve and open thaw gas hand valve.
6. start machine in normal operating condition.