Superior Valve Company

Replaceable Suction Filter

•On many parallel systems, the Superior Valve Co. suction filter is installed.

Table 25. Type F Filter

Replaceable Cartridges -

Shell	Catalog	IBCA	Cartridge	Filter
No.	No.	No.	OD (in.)	Area (in2.)
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

Table 26. Type DF (for cleanup)

Replaceable Cartridges -

Shell	Catalog	IBCA	Cartridge	Filter
No.	No.	No.	OD (in.)	Area (in2.)
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

Installation and Operations Manual

Table 28. Type AFD (for cleanup)

Replaceable Cartridges -

Shell	Filter	Cartridge	Filter
No.	Core	OD (in.)	Area (in2.)
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

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

Alco Controls

Alco Suction Filter

Comparable to the Superior suction filters and interchangeable cores.

Table 27. Type AF Filter

Replaceable Cartridges -

Shell	Filter	Cartridge	Filter
No.	Core	OD (in.)	Area (in2.)
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

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.

30	Part # 25000102