Vogt Tube-Ice HFO10, Service Manual

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5-3
Add no more than 10 lb. (4.5 kg) of refrigerant and allow the machine to operate for several cycles before
checking the level again.
It is also possible to check the refrigerant level by pumping down the machine (Refer to Pumpdown ). When the
machine is pumped down, some liquid should be observed in the receiver’s sight glass.
Refrigerant must be added in liquid form through the machine ’s charging valve. No air or other non-condensable
gases should enter the system when filling the machine with refrigerant. The compressor crankcase heater must
be energized for a minimum of two hours before starting and running the compressor.
While the machine is running, add refrigerant according to the steps below:
1. Connect the charging valve on the machine to the refrigerant cylinder using a hose or pipe suitable for
R513A service. Refer to the instruction card attached to the refrigerant cylinder.
2. Open the valve on the refrigerant cylinder and purge air out of the charging line at the charging valve
connection.
3. Open the charging valve on the machine.
4. The charging valve must be closed when the freezer is in a harvest period.
Immediately close the machine charging valve at the start of the harvest period if a refrigerant
cylinder is connected. Never leave a refrigerant cylinder connected to the system except during charging
operations. Failure to observe either of these precautions can result in transferring refrigerant from the system
into the refrigerant cylinder, causing it to overfill and possibly rupture as the liquid refrigerant expands.