Alto-Shaam QC-50 Operations Instructions download pdf (Page 18)

4.1 INTRODUCTION

The relays, which control the compressors, fans,

solenoids, and heaters, can be individually controlled

by the microprocessor control set in a manual mode.

The following test will verify that these components

are being controlled and will verify the operational

integrity of the relays and fuse sets.

4.2 CONTROL DIAGNOSIS

The main menu is the starting point for this test. With

the Main Menu screen displayed, press and hold "0" on

the numeric keyboard for approximately 5 seconds to

access the password screen.

PASSWORD ENTRY SCREEN

When the Password Entry screen is in view, enter the

password code on the alphanumeric keyboard.

PASSWORD

91095340D

If the wrong password number is entered in error, a

buzzer will sound and the display will revert to the

Main Menu screen. Access the Password Entry screen

again and enter the correct password number.

A correctly entered password will result in a

diagnostic screen.

DIAGNOSTIC SCREEN

Pressing the numerical keyboard numbers 1 through 8

will toggle the power to an individual relay. Buttons 1

and 2 represent the two solenoid relays, while buttons

3 and 4 control the relays for each of the two fan banks.

Buttons 5, 6, and 7 control the three relays which con-

trol each pair of heater wraps. Button 8 controls two

relays, each of which controls a single condensing unit.

4.2.1 SOLENOID CHECK:

Press button 1 and button 2 on the numeric keyboard

several times. Each time these buttons are pressed the

sound of the solenoids should be audible as they click

open and closed. There should also be a distinct

difference in the sound of an opening solenoid and a

closing solenoid.

4.2.2 FAN CHECK:

Under normal operating conditions the fan(s) stop

rotating whenever the chiller door is opened. Fan

operation can only be verified with an open door in

the manual mode. The evaporator coil temperature

must also be below 30°F. Press button 3 followed by

button 4 and open the Quickchiller door. The fans

should be operating.

4.2.3 DEFROST HEATER CHECK:

Press button 5, 6, and button 7 once to detect the sound

of the defrost heater relays as they click ON. Press each

of these buttons once again to deactivate the defrost

heaters. This procedure will only detect the coil side of

each of the defrost heater relays but does not test the

operational condition of the defrost heaters nor test the

defrost heater fuses.

4.2.4 CONDENSING UNIT CHECK:

Press button 8 once to power both condensing units.

The "compressor" relays are solid-state and will not

produce an audible click, however; the compressors

should be audible. After a short period of time, the

compressors will automatically cycle OFF. Open the

solenoids (see 4.2.1) and the compressors will again

cycle ON. Close the solenoids.

4.2.5 COOLING TEST:

Open both solenoids (see 4.2.1) to activate the

compressors. When the compressors are activated,

press button 9. The display screen will indicate the

temperature of the air probe, the three food probes,

and the evaporator sensor. Allow the chiller to operate

in this mode for approximately 10 minutes. The air

temperature inside the food storage compartment

should begin to fall. This cooling condition will be

indicated on the display screen. If the food probe(s) do

not appear to be functioning properly, hold the tip of

the probe in your hand. The temperature display for

the hand-held probe should slowly increase. Any of

the probes which display an excessively high reading

(~300 to 400F —149 to 204C) will indicate a broken

connection or defective probe.

Do not allow the unit to operate

unattended in this Mode. This is an

uncontrolled Cool-down Mode and

will eventually cause excessive

build-up on the Evaporators.

#8400 Installation & Maintenance Manual - Pg. 16

4.0 — Diagnostic and Repair Procedure — CONTROL

Q-CHILLER CONFIGURE

PASSWORD: ________________

SOLEND 1=HLD 2=CHL

FANS 3=HLD 4=CHL

HEATER 5=HLD 6, 7=CHL

COMPRS 8=ALL 9, 0, D

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 28 29

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Alto-Shaam QC-50 Operations Instructions Page 18

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