Heatcraft Refrigeration Products PARALLEL COMPRESSOR SYSTEMS 25000102 - Manual (Page 30)

30 Part # 25000102
Installation and Operations Manual
Superior Valve Company
Replaceable Suction Filter
On many parallel systems, the Superior Valve Co. suction
filter is installed.
•
Alco Controls
Alco Suction Filter
Comparable to the Superior suction filters and interchangeable
cores.
Table 28. Type AFD (for cleanup)
Replaceable Cartridges -
Head Pressure Control
In a system with variable pressure control the receiver pressure
is maintained at the desired pressure by supplying discharge
gas to it through an adjustable outlet regulator. Further power
savings may be realized by directing only the hot gas to the
top of the receiver to minimize the mixing of cold liquid and
hot gas. As a result subcooled liquid is fed to the evaporators
resulting in increased refrigeration effect and efficiency. Also,
the amount of hot gas, that would otherwise condense to wary
liquid, is reduced and a lower cost, smaller regulator can be
used. In general, only one third of bypass is needed compared
to mixing the gas and liquid entering the receiver.
Valve Functions
Referring to the Figure above, Valve A is an Inlet Pressure
Regulator in the liquid drain line from the condenser, and senses
the condenser pressure. The regulator closes as the condenser
pressure drops below the set point, thus back-flooding the
condenser and reducing the inside surface area available for
condensing.
Valve B is and Outlet Pressure Regulator in the bypass line
from compressor discharge to the condenser liquid drain
line. This valve senses the receiver pressure and opens when
this pressure drops below the set point, thus maintaining the
receiver pressure.
Valve C is an In-line Check Valve in the liquid drain line to prevent
higher pressure from backing up into the condenser during low
ambient conditions when the compressor is idle.
Table 27. Type AF Filter
Replaceable Cartridges -
Table 25. Type F Filter
Replaceable Cartridges -
Table 26. Type DF (for cleanup)
Replaceable Cartridges -
Shell
No.
Catalog
No.
IBCA
No.
Cartridge
OD (in.)
Filter
Area (in 2 .)
2CFA F25A 51071 1-23/32 66
3CFA F35A 51072 2-5/8 115
4CFA F45A 51073 3-17/32 189
5CFA F55A 51074 4-1/16 270
Shell
No.
Catalog
No.
IBCA
No.
Cartridge
OD (in.)
Filter
Area (in 2 .)
2CFA DF25A 51053 1-23/32 66
3CFA DF35A 51059 2-5/8 115
4CFA DF45A 51060 3-17/32 189
5CFA DF55A 51061 4-1/16 270
Shell
No.
Filter
Core
Cartridge
OD (in.)
Filter
Area (in 2 .)
BTAS-2 A2F 1-29/32 66
BTAS-3 A3F 2-3/4 115
BTAS-4 A4F 3-3/4 189
BTAS-5 A5F 4-5/16 270
Shell
No.
Filter
Core
Cartridge
OD (in.)
Filter
Area (in 2 .)
BTAS-2 A2F-D 1-29/32 66
BTAS-3 A3F-D 2-3/4 115
BTAS-4 A4F-D 3-3/4 189
BTAS-5 A5F-D 4-5/16 270