4 . 1 I N T R O D U C T I O N
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 C O N T R O L D I A G N O S I S
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.
PA S S W O R D E N T RY S C R E E N
When the Password Entry screen is in view, enter the
password code on the alphanumeric keyboard.
P A S S W O R D
9 1 0 9 5 3 4 0 D
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.
D I A G N O S T I C S C R E E N
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 S O L E N O I D C H E C K :
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 FA N C H E C K :
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 HE AT E R C H E C K :
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 C O N D E N S I N G U N I T C H E C K :
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 C O O L I N G T E S T:
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 — D i a g n o s t i c a n d R e p a i r P r o c e d u r e — C O N T R O L
Q - C H I L L E R C O N F I G U R E
P A S S W O R D : ________________
S O L E N D
1 = H L D
2 = C H L
FA N S
3 = H L D
4 = C H L
H E AT E R
5 = H L D
6 , 7 = C H L
C O M P R S
8 = A L L
9 , 0 , D
