Operating instructions

#8401 QC-100 INSTALLATION & MAINTENANCE MANUAL PG.19
Compressor does not run
No electricity..............................Close start or disconnect switch
Fuse blown .................................Replace fuse
Control stuck open ....................Repair or replace
Frozen compressor.....................Replace
Off on high pressure..................Determine cause of high
pressure, make corrections, and
reset high limit lock-out.
Unit short cycles
Control differential
set too closely.............................Widen differential
Discharge valve leaking ............Correct condition
Compressor overload
cutting out..................................Check for high head pressure
or clogged condenser coil
Shortage of refrigerant ..............Evacuate, capture remaining
refrigerant, repair leak
and recharge.
Leaky expansion valve ..............Replace
Refrigerant overcharge ..............Capture excess refrigerant
Unit operates long or continuously
Shortage of refrigerant ..............Evacuate, capture remaining
refrigerant, repair leak
and recharge.
Control contacts frozen .............Replace control
Dirty condenser coil ..................Clean condenser coil
Location too warm.....................Change to cooler location
Plugged expansion valve
or retainer ..................................Clean or replace
Iced evaporator coil ...................Defrost or clean
Service load................................Keep doors closed
Head pressure too high
Refrigerant overcharge ..............Capture excess refrigerant
Dirty condenser coil ..................Clean
Unit location too warm..............Relocate unit
Fixture temperature too high
Refrigerant shortage ..................Evacuate, capture remaining
refrigerant, repair leak,
and recharge.
Control set too high...................Reset control
Expansion valve or
strainer plugged.........................Clean or replace
Expansion valve
out of adjustment.......................Correctly adjust
Iced or dirty coil ........................Defrost or clean
Restricted gas lines ....................Clear restriction
Head pressure too low
Refrigerant shortage ..................Evacuate, capture remaining
refrigerant, repair leak,
and recharge.
Unit location too cold ................None needed — efficiency
is increased
Unit is very noisy
Improper unpacking ..................Remove shipping blocks
and/or angles
Tubing rattle...............................Bend tubes away from point
of contact.
Mountings loose.........................Tighten
Frosted liquid line
Receiver shut-off valve
partially closed
or restricted................................Open valve or remove
restriction
R
estricted liquid line
or component
...............................Replace restricted part
Unit on vacuum — frost on expansion valve only
Ice in expansion
valve orifice ...............................Apply hot wet cloth to
expansion valve; moisture
indicated by increase in suction
pressure; replace dryer
Restricted expansion
valve strainer .............................Clean strainer or replace valve
6.0 — REFRIGERATION — Troubleshooting
This chart is provided for the assistance of refrigeration technicians only and is not intended for use by
untrained or unauthorized service personnel. If your Alto-Shaam Quickchiller is not operating properly,
check the following BEFORE calling your Authorized Alto-Shaam Service Agent:
Check the power flow to the unit. Fuses OK? Breakers OK?
DO NOT ATTEMPT TO REPAIR OR SERVICE THE QUICKCHILLER BEYOND THIS POINT.
Contact Alto-Shaam for the nearest authorized service agent. These are the only service agents
the company will authorize to repair Alto-Shaam Quickchillers. Repairs made by any other
service agents without prior authorization by Alto-Shaam will void the warranty on the unit.
➾
SPECIAL INFORMATION:
Alto-Shaam, Inc. has a 5-year limited warranty on the Quickchiller
™
compressor. This is
included as standard from the date of the unit shipment. This warranty excludes labor.