Alto-Shaam quickchiller QC-50, Руководство по установке и обслуживанию

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#8400 Installation & Maintenance Manual
- Pg. 19
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 — R E F R I G E R AT I O N
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:
1. 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.
☞
Compressor does not run
Motor line open..........................Close start or disconnect switch
Fuse blown .................................Replace fuse
Control stuck open.....................Repair or replace
Frozen compressor
or motor bearings.......................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
Motor-compressor
overload cutting out ..................Check for high head pressure or
clogged condensing unit
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 condensing unit ................Clean condensing unit
Location too warm .....................Change to cooler location
Plugged expansion valve
or retainer...................................Clean or replace
Iced or plugged coil ...................Defrost or clean
Service load ................................Keep doors closed
Head pressure too high
Refrigerant overcharge ..............Capture excess refrigerant
Dirty condensing unit ................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 set too high .....Lower setting
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
Restricted liquid line
or component .............................Replace restricted part
Unit on vacuum — frost on expansion valve only
Ice plugging expansion
valve orifice ...............................Apply hot wet cloth to
expansion valve; moisture
indicated by increase in suction
pressure; replace dryer
Plugged expansion
valve strainer .............................Clean strainer or replace valve
S P E C I A L
I N F O R M AT I O N :
Alto-Shaam
®
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.