Vogt P18AL TUBE-ICE, Service Manual

Page: 37 / 88

P18AL Service Manual
STAR-UP AND OPERATION
3/6/07
5-2
Refrigerant Charge
Prior to charging the machine with anhydrous ammonia (R-717) make sure
the system is leak tight and free of non-condensables or other contaminants.
The machine will require a full charge of pure anhydrous ammonia. Make sure it is from a reputable
supplier who can and will furnish quality ammonia of Refrigeration or Federal Technical grade.
Grade
Minimum
Ammonia Content
Maximum
Water Content
Maximum
Oil Content
Maximum Non-
condensable
Fertilizer 99.50% 5000 PPM 5 PPM N/A
Refrigeration 99.98% 150 PPM 3 PPM .2 ml/g
Federal Technical 99.98% 200 PPM 5 PPM None
Metallurgical 99.99% 33 PPM 2 PPM 10 ml/g
Research 99.999% 5 PPM 1 PPM 7 PPM
(Reference IIAR Ammonia Data Book Chapter 1, General Information)
NOTE: Do not use Fertilizer grade ammonia.
TABLE 5-1
Ammonia Specification By Grade
Total ammonia (R-717) charge required:
Dedicated System - 500 lbs.
Evaporator only - 250 lbs.
Special precautions to be observed when charging refrigeration systems.
Only technically
qualified persons, experienced and knowledgeable in the handling of anhydrous ammonia refrigerant
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 ammonia (R717)
refrigerants. See “Material Safety Data Sheet”, MSDS Code5B81-83, for detailed information.
Charging From Tank Truck (dedicated high side only).
The system may be charged by bulk
from a tank truck and be pumped directly into the receiver through the drain valve.
Follow these instructions with caution:
1.
Using a ammonia approved charging hose, connect one end to the drain/charging valve in the
bottom of the high pressure receiver.
2. Connect the other end of the charging hose to the tank truck. It is best to have a gage in this line
to indicate pressure.
3. Open the drain/charging valve and the fill valve from the tank truck.
4. While observing the sight glass on the high pressure receiver, fill the receiver to the proper
volume.
5. Make sure the charging valve is closed and the cylinder valve is closed before attempting to
disconnect the hose. Use caution when disconnecting the charging hose, it will contain liquid
ammonia and should be disposed of in accordance with local, state and federal safety and
environmental rules.
! CAUTION !
Do NOT attempt to bulk charge the machine through the freezer charging valve (30). The
freezer will not hold the full charge without exposing the compressor to serious damage.
! CAUTION !