Vogt P18AL TUBE-ICE, Service Manual

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P18AL Service Manual
INTRODUCTION
3/6/07
1-2
Important Safety Notice. This information is intended for use by individuals possessing adequate
backgrounds of electrical, refrigeration and mechanical experience. Any attempt to repair major
equipment may result in personal injury and property damage. The manufacturer or seller cannot be
responsible for the interpretation of this information, nor can it assume any liability in connection
with its use.
Special Precautions To Be Observed When Charging Refrigeration Systems. Only technically
qualified persons, experienced and knowledgeable in the handling of anhydrous ammonia refrigerant
(R-717) and operation of refrigeration systems, should perform the operations described in this
manual. All local, federal, and EPA regulations must be strictly adhered to when handling
refrigerants. If a refrigeration system is being charged from refrigerant cylinders, disconnect each
cylinder when empty or when the system is fully charged. A gage should be installed in the
charging line to indicate refrigerant cylinder pressure. The cylinder may be considered empty of
liquid R-717 refrigerant when the gauge pressure is 25 pounds or less, and there is no frost on the
cylinder. Close the refrigerant charging valve and cylinder valve before disconnecting the cylinder.
Loosen the union in the refrigerant charging line--carefully to avoid unnecessary and illegal release
of refrigerant into the atmosphere.
! CAUTION !
Immediately close system charging valve at commencement of defrost or thawing cycle if
refrigerant cylinder is connected. Never leave a refrigerant cylinder connected to system
except during charging operation. Failure to observe either of these precautions can result in
transferring refrigerant from the system to the refrigerant cylinder, over-filling it, and
possibly causing the cylinder to rupture because of pressure from expansion of the liquid
refrigerant.
! CAUTION !
Always store cylinders containing refrigerant in a cool place. They should never be exposed to
temperatures higher than 120
°
F and should be stored in a manner to prevent abnormal mechanical
shocks.
Also, transferring refrigerant from a refrigeration system into a cylinder can be very dangerous and
is not recommended.
! CAUTION !
It is not recommended that refrigerant be transferred from a refrigeration system directly into
a cylinder. If such a transfer is made, the refrigerant cylinder must be an approved, CLEAN
cylinder--free of any contaminants or foreign materials--and must be connected to an
approved recovery mechanism with a safety shutoff sensor to assure contents do not exceed net
weight specified by cylinder manufacturer or any applicable code requirements.
! CAUTION !