4.3 CONDENSING UNITS
The condensing units operate only when the system is
in a cooling mode and the food storage compartment
requires a decrease in temperature. If it appears the
condensing units are not functioning properly and the
General Diagnostic Procedure (4.2.4) on the preceding
page was unable to pinpoint the specific cause, the
following steps should be taken for further diagnosis.
4.3.1 CONTROL CABLE CONNECTIONS:
Open the key lock on the alphanumeric keyboard
display enclosure. Inspect each circuit board
connection wire to be certain they are firmly
attached to the board. Pay particular attention to
the gray ribbon cable which originates through a
hole behind the circuit board. This cable should be
firmly attached to the black connector marked I/O
CONNECTOR. The additional gray ribbon cable
originating from the display should be firmly
attached to the black connector marked LCD DISPLAY.
The black connector marked PRINTER should only be
connected if the original factory order specified a
parallel printer port instead of the normal serial
printer port.
If it is determined the control cable connections are
secure, the problem may be related to a fuse, relay,
or device failure. At this point in the diagnosis
check the fuses.
4.3.2 CONDENSING UNIT FUSES:
Quickchiller condensing units, fans, heaters, and
solenoids are fused with 20mm fuses. Fuses are
located on the relay board which is mounted within
the electrical enclosure.
WARNING
MAKE CERTAIN THE MAIN POWER IS
OFF BEFORE SERVICING.
Disconnect main incoming A.C. power to the unit.
When all power to the system is
OFF, gain access to
the electrical enclosure and remove the enclosure
cover. Before removing the fuses, measure the
voltage to make certain the power has been
completely disconnected. Each of the two
compressors have one fuse on L
1
and L
2
for a total
of four fuses. Test each fuse with an ohm-meter and
replace if necessary only with an identical fuse.
If the fuses do not require replacement or if the
compressors still do not function, call the factory
for assistance.
4.4 FANS, HEATERS, SOLENOIDS
If it appears the fans, heaters, or solenoids are not
functioning properly and the General Diagnostic
Procedure on the preceding page was unable to
pinpoint the specific cause leading to repair, follow
general directions prescribed for CONTROL CABLE
CONNECTIONS and CONDENSING UNIT FUSES
under the Condensing Unit heading on this page.
#8400 Installation & Maintenance Manual - Pg. 17
4.0 — Diagnostic and Repair Procedure — CONTROL
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