SPX Waukesha Cherry-Burrell Votator II, Operation And Maintenance Manual

Page: 18 / 84

Installation Waukesha Cherry-Burrell
Page 18 95-03057 October 2005
Suggested Media Piping for Liquid Over Feed Refrigeration
The liquid feed solenoid valve when opened, allows liquid refrigerant to flow into the jacket of the heat exchanger. The
flow is regulated by a manually set flow control valve. Cooling is achieved when the pressure control valve is opened,
causing the pressure in the jacket to be reduced. This causes the liquid refrigerant to change phase, absorbing heat from
the heat exchanger tube and product. The cooling rate is controlled by the back pressure on the system and stops when the
valve is closed. Hot gas is used to push all of the remaining liquid from the system into the ammonia low pressure receiver
and quickly warm the system. The low pressure receiver in the compressor room is designed to separate the liquid from
the vapor before re-compressing.
Table 3: Call Outs For Figure 6
Figure 6 - Suggested Media Piping, Liquid Over Feed or Pumped Refrigeration
1. Safety Relief Valve 10. Dual Pressure Regulating Valve (includes Items 4, 8 and 9)
2. Product IN 11. To Refrigerant Low Pressure Receiver
3. Product OUT 12. Hot Gas Purge Valve
4. Low Pressure Solenoid Valve, see Item 10 13. Flow Control Valve
5. Hot Gas 14. Liquid Feed Solenoid Valve
6/7. Electric Control Signal or Instrument Air
Regulated to 60 PSI
15. Liquid Refrigerant from Low Pressure Receiver
16. Hot Gas Reducing Valve
8. Low Pressure Regulating Valve, see Item 10 17. Hot Gas Solenoid Valve
9. High Pressure Regulating Valve, see Item 10 18. Hot Gas Pressure Regulating Valve