Alto-Shaam 1000-MR1 Handbuch für Betrieb und Pflege - Seite 9

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7.2

LOW PRESSURE CONTROL REPLACEMENT

1. Disconnect the unit from the power source.

2. Remove the control cover and disconnect the

electrical terminals.

3. Disconnect the capillary tube.

4. Remove mounting fasteners from the control

base and install a new control by reversing

the procedure.

NOTE:

The cabinet temperature

(37° to 40°F — 3° to 4°C) is regulated

by system pressure rather than actual

cabinet compartment temperature.

5. To adjust the control, attach the service

manifold to the suction. Discharge the valves

by slightly opening one-fourth to one-half

turn to all the gauges to clear.

6. Coarse-adjust the control with a standard

screwdriver by turning the adjustment

screws located on the top of the control.

Preset the cut-in and cut-out at 68-pounds

and 38-pounds, respectively.

7. Start the system. Allow the system to operate

for 5 minutes. Monitor the low-side pressure.

Fine adjustments will be required to achieve

the required cycling pressures.

NOTE:

The control adjustment process can be

accelerated by running the suction valve

in or out as required to effectively

change the pressures.

S E R V I C E

7.3 FILTER DRYER REPLACEMENT

7.4

CHARGING THE REFRIGERATION SYSTEM

Operation and Care Manual #8410/11 • 8

Close liquid line valve and run compressor

until the low-side refrigeration gauge

indicates 0 pounds. Close suction valve.

Remove filter dryer from system and replace

with new dryer.

Purge system and add refrigerant if needed.

Connect service gauges to the suction and

discharge service valves and open valves one

full turn.

If the system is slightly pressurized, open

both manifold gauge valves and purge the

service gauge lines.

With manifold gauge valves closed, start the

refrigeration system.

Attach a drum of 134a refrigerant to the

suction service-side of the manifold gauges

and add refrigerant through the suction side

until the liquid sight glass is clear of

bubbles.

SWITCH THE CONTROL PANEL POWER

TO THE "OFF" POSITION AND

DISCONNECT THE POWER SUPPLY

CORD BEFORE SERVICING.