Victory Reach-In Manuale di Servizio Scaricare il pdf (Pagina 51)

Section 6 Refrigeration System

6-9

Control Specifications and Diagnostics

High Pressure Cutout (HPCO) if applicable

FUNCTION

The high pressure cutout control turns the

Reach-In unit off if it is subjected to excessive

high side pressure. This control is normally

closed (N.C.) and opens on a rise in pressure.

SPECIFICATIONS

Cut-out 440 psig +/- 10

Cut-in Manual reset (below 300 psig)

CHECK PROCEDURE

1. Set the ON/OFF switch to OFF.

2. Reset the HPCO if tripped.

3. Hook a voltmeter in parallel across the

HPCO, leaving the wires attached.

4. Connect the manifold gauges.

5. Disconnect the condenser fan motor.

6. Set the ON/OFF switch to ON.

7. Lack of air flowing through the condenser

will cause the HPCO to open. Watch the

high pressure gauge. Record the pressure

at which the cut-out occurs.

REPLACEMENT

Replace the HPCO if:

1. The control will not reset.

NOTE: High side pressure must be below

300 psig to enable the manual reset.

2. The control does not open at

440 psig +/- 10.

Liquid Injection Valve

(FS1, FS2, FS3 with R-402B [HP81] Only)

FUNCTION

The liquid injection valve injects saturated

vapor into the suction line of the compressor.

This is done to keep the discharge line

temperature below 245°F (118°C).

SPECIFICATIONS

Valve Settings 237°F (+3°F/-2°F)

114°C (+1.6°C/-1.1°C)

VALVE FAILS CLOSED

Measure the temperature of the discharge line

at the sensor bulb. If the temperature rises

above specifications and the control does not

open, replace the control.

VALVE FAILS OPEN

Suction pressure will be higher than normal.

Liquid refrigerant flowing through the valve

will “flash off,” causing frost on the suction

line.

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