Emerson Fluid Chiller Anleitung zur Fehlerbehebung PDF herunterladen (Seite 37)

System Protectors

Emerson Climate Technologies

Schematic of a basic heat pump system.

Filter Driers for Heat Pumps

A heat pump is essentially a refrigeration sys-

tem that can ow in either direction. The key to its

operation is a four-way reversing valve that routes

the discharge gas from the compressor.

Depending on whether the system is cooling or

heating, the indoor and outdoor coils swap roles,

taking turns serving as the condenser and evapo-

rator.

Since conventional refrigerant control compo-

nents are designed for unidirectional operation,

their use in heat pumps requires installation in

pairs, one for each direction, with check valves

routing the ow through or around them. Today,

because of the growing use of heat pumps, com-

ponents such as thermostatic expansion valves

are available in bi-directional versions, as are lter

driers.

Removing Contaminants

Just like any other refrigeration system, heat

pump system components need lter drier protec-

tion to remove solid and soluble contaminants.

This may be handled several ways.

First, in systems with one-way expansion

valves and check valves, a one-way lter drier

might be installed in series with a check valve.

This would be a “part-time” arrangement, in that

ltration would be provided in only one direction.

Second, a one-way lter drier might be installed

with each of the check valves, so that one pro-

vides ltration in each direction.

Third, the simplest arrangement is to install a

bi-directional lter drier in the common liquid line.

Used in combination with a bi-directional thermo-

static expansion valve such as Emerson’s HF se-

ries, the complexity of multiple expansion valves,

check valves, and lter driers can be completely

eliminated.

Emerson BKF bi-directional pump lter drier

One-Way Flow, Both Directions

Inside a bi-directional lter drier the refrigerant al-

ways ows in the same direction through the dessicant

core regardless of which way the refrigerant is owing

through the system. The internal ow in this case is

controlled by an inlet apper valve and an outlet poppet

valve on each side of the desiccant core. As the liquid

enters the lter drier from either direction, the inlet ap-

per valve routes it to the outside of the desiccant core.

After it ows through to the inside of the desiccant core,

it exits through the opposite poppet valve.

The purpose of the arrangement shown below is to

prevent contaminants collected in one direction from be-

ing ushed back out when the ow reverses.

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