
34
System Protectors
Emerson Climate Technologies
Bi-directional components allow simplication of system
Cross section showing BFK internal components
Simplifying While Servicing
When servicing or repairing heat pump systems,
especially older units, it’s a good idea to simplify them
by replacing unidirectional driers and check valves with
bi-directional driers. When a bi-directional lter drier
is installed, check valves, and lter driers can all be
replaced at once with copper tubing.
Refrigerant ow either direction passes from
outside to inside of desiccant core
Emerson System Protectors
Emerson lter driers were redesigned for increased
water removal capacity to reach these low moisture
levels. However, since no system is entirely without
water on startup some organic acids will be generated
and must be removed. The desiccant formulation for
the Emerson EK series of lter driers was designed to
provide the best mix of water capacity and acid capacity
to ensure that harmful contaminates are removed. This
desiccant mixture contains molecular sieve and activat-
ed alumina. The molecular sieve is specically designed
to provide maximum drying in today’s systems. The
activated alumina is ideal for capturing the large organic
acids that the molecular sieve cannot.
Replace two check valves and two
expansion valves with one EMERSON
Bi-directional Thermal Expansion V
Expansion Device
Filter-Drier
Check Valve
Filter-Drier
Expansion Device
Remove both filter-driers &
replace each with a piece of
copper tube
Install One BFK
in a convenient
Location in Common
Liquid Line
Emerson
Suction Line
Filter-Drier
Emerson
Discharge
Muffler
Emerson 4-way
Reversing Valve
Molded Desiccant Block
Inlet
Flapper
Valve
Outlet
Poppert
Valve
Outlet
Poppert
Valve
Inlet
Flapper
Valve
Inlet
Flapper
Valve
Inlet
Flapper
Valve
Steel Retaining Screen
Steel Retaining Screen
Final Filter Pad
INTERNAL
CONSTRUCTION
BASIC FLOW
PA
TTERNS
Heating
Cycle
Cycle
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