Operating instructions

#8401 QC-100 INSTALLATION & MAINTENANCE MANUAL PG.17
5.1 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.
5.2 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.
5.2.1 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.
5.2.2 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.
5.2.3 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.
5.2.4 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.
5.2.5 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.
5.0 — Diagnostic and Repair Procedure
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