Alto-Shaam QC-40 User Manual download pdf (Page 9)

The condenser unit(s) solid state relay(s) are powered by the relay

board through the J6 plug located on the upper right corner of the relay

board (Figure 17). L

is continuously supplied to the solid state condenser

relay(s) and L

is switched by the solid state relay on the relay board with

protection by the 250MA fuse (F15).

During either Chill mode or the Holding mode, L

and L

continuously supplied both to and through the solid state relay on the relay

board, to and through the condenser solid state relay(s), and to the pressure

switch(s) and the compressor(s). Both the solid state relay on the relay

board and the solid state relay(s) for the condenser are powered at all times

and the condensers are cycled by the probes. Line voltage (both L

and L

)

to the condensing units is protected by the SC15 or SC 20 fuses located in

the relay board enclosure. When the probe temperatures are satisfied, the

relay board de-energizes the solenoid valve(s) which causes the

compressor(s) to pump-down into a vacuum. When the pressure on the

suction line drops to 2PSIG, the pressure switch will open and disconnect

the voltage on L

which causes the condenser to shut OFF. When the

probe(s) call for cooling, the relay board re-energizes the solenoid coil(s)

causing the low side pressure to rise. When the pressure increases to 18

PSIG, the pressure switch will close which will supply voltage on L

and

turn the condensing unit ON.

NOTE: IF THE SOLENOID COIL DOES NOT CLOSE, THE RELAY BOARD SOLENOID COIL LED IS NOT

ILLUMINATED AND THERE IS NO POWER TO THE SOLENOID COIL, A VARISTOR MUST BE

INSTALLED ACROSS L

AND THE RIGHT AND/OR LEFT SOLENOID COIL CONNECTION ON

PLUG J5 (

FIGURE 16).

PRESSURE SWITCH

The pressure switch is opened and closed by means of a capillary tube connected to the suction line

which applies pressure on a diaphragm to open and close the switch. The cut-out setting is 2PSIG and the

cut-in setting is 18PSIG.

NOTE: IF THERE IS A LEAK IN THE REFRIGERATION SYSTEM, THE CONDENSER WILL NOT TURN

ON.

TO TEST THE CONDENSER, JUMP-OUT THE PRESSURE SWITCH. IF THE CONDENSER TESTS

GOOD, REMOVE THE JUMPER, LOCATE AND REPAIR THE LEAK, AND RECHARGE THE SYSTEM.

Figure 17

250MA

FUSE

SOLID

STATE

RELAY

SUPPLY

VOLTAGE

FROM SOLID

STATE RELAY

ON RELAY

BOARD TO

CONDENSER

SOLID STATE

RELAY(S).

SUPPLY

VOLTAGE TO

SOLID

STATE

RELAY

BOARD.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

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Alto-Shaam QC-40 User Manual Page 9

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