Alto-Shaam 1000-MR1 Bedienings- en onderhoudshandleiding - Pagina 8
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Pagina afdrukkenThe components addressed in the section
are considered acceptable for repair
using standard procedures. The skill
level required to perform these
repairs vary. Some require specific
training and are not intended for use by
untrained or unauthorized service personnel.
Procedures requiring refrigerant
handling require certification.
If your unit is not operating properly contact
Alto-Shaam
for the nearest authorized service
®
agent. These are the only service agents the
company will authorize to repair Alto-Shaam
units. Repairs made by any other service agents
without prior authorization by Alto-Shaam
void the warranty on the unit.
7.0 REFRIGERANT LEAK
With the unit in a cooling cycle, use a
flashlight to locate the liquid refrigerant sight
glass. If the compressor has been operating
for three minutes, no visible bubbles should
appear within the sight glass. If bubbles
appear in the sight glass, it will be necessary
to determine if there is a refrigerant leak.
1. Make certain the unit is switched off and
the power cord is disconnected. Using a
halide or electronic leak detector, check all
fittings and connections for a leak.
2. If a leak is found on a flared fitting, it can
often be repaired by tightening the brass
flare nut a quarter of a turn. If this does
not resolve the problem, it may be
necessary to reflare the tubing.
3. If a leak is found on a brazed joint, it will
be necessary to pump-down the system
refrigerant charge to repair the leak(s).
Connect service gauges to the system at the
suction valve (
valve (
ON THE RECEIVER
refrigerant into the receiver. To avoid
contamination, purge the gauges
) and liquid
ON THE COMPRESSOR
) to pump the
SWITCH THE CONTROL PANEL POWER
TO THE "OFF" POSITION AND
DISCONNECT THE POWER SUPPLY
CORD BEFORE SERVICING.
Operation and Care Manual #8410/11 • 7
S E R V I C E
REFRIGERANT INTO THE ATMOSPHERE
A l t o - S h a a m , I n c . u r g e s a l l i n d i v i d u a l s
responsible for training, teaching or
advising installation mechanics and service
personnel to emphasize proper handling
a n d c h a r g i n g t e c h n i q u e s a n d s t r i c t
adherence to limiting refrigerant charge
®
amount to those specifically recommended
by the manufacturers of refrigeration, air
will
®
conditioning or heat-pump systems.
before opening the system valves. Front
seat the liquid or high-pressure receiver
valve to the maximum extent to prevent
refrigerant from exiting the receiver. Start
the unit and allow it to operate until the
suction or low pressure gauge indicates 5
pounds. When 5 pounds is indicated, close
the suction valve, de-energize the system
and repair the leak(s).
7.1 EXPANSION VALVE REPLACEMENT
1. Shut liquid valve and run compressor until
it pumps refrigerant into receiver (low-side
service gauge will read 0 pounds). Close
the suction line valve.
2. Disconnect the sensor bulb on the suction
line.
3. Disconnect the 3/8" (9,5mm) liquid line
along with the 5/8" (16mm) suction line.
Remove valve.
4. Install new valve. Reconnect lines and
refasten sensor bulb.
NOTE:
FEDERAL LAWS REQUIRE
PROPER HANDLING AND
DISPOSAL OF REFRIGERANT.
IT IS UNLAWFUL TO VENT ANY
The super-heat valve is preset at the
factory, therefore, adjustment is NOT
recommended.