Installation
Waukesha Cherry-Burrell
Page 16
95-03057
11/2012
Hot Gas Pressure Regulating Valve
Systems with hot gas include a solenoid-operated Pressure
Regulating Valve for introducing and maintaining constant
downstream pressure for hot gas inlet.
Pumped Refrigeration Systems include a solenoid operated Hot
Gas Purge Valve for each Votator hot gas discharge line.
Pressure Relief Valve
DANGER:
Never install a shutoff
valve in a relief line.
This valve is located on the accumulator and should be
exhausted to outside the building. The valve is factory set to
relieve at the design pressure of the accumulator.
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.
Figure 10- Suggested Media Piping, Liquid Over Feed or Pumped Refrigeration
2
3
4
5
6
7
8
9
10
11
12
13
13
14
15
16
1
1
17
S
S
PI
S
S
S
HE100-053a
18
or
