Brochure

Catalog CIC-2003-1/US
Refrigeration Solenoid Valves
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
257
Refrigeration
Solenoid Valves
Typical Applications
In the parallel systems there are, in effect, two separate
condensers. During normal operation, the condenser
is used for complete condensation of the discharge
gas. In the heat reclaim mode the discharge gas is
completely condensed in the heat reclaim coil thus
maximizing the use of both sensible and latent heat.
Some manufacturers recommend installing a 1/4" line
from the heat reclaim coil, at its lowest point, back to
the receiver to insure the proper drainage of oil and liq-
uid refrigerant during the off cycle. Other manufacturers
suggest the installation of a pressure control, to insure
that the system will switch from the heat reclaim mode
to the condenser in the event of fan stoppage or
clogged filters.
Split Evaporator — Humidity Control
There are often times when the air temperature is satis-
factory but the humidity level is too high. This can be
remedied by using only half the evaporator to dehu-
midify the air without excessive cooling and the addition
of auxiliary heat. This can best be accomplisehd by us-
ing a normally open solenoid valve on one half of the
evaporator controlled by a humidistat.
Heat Reclaim System (Series)
Heat Reclaim System (Parallel)
Split Coil Air Conditioning Dehumidification System
Hot Gas Defrost System
Hot gas defrost offers an excellent alternative to electric
or air defrost. In this system the hot compressor discharge
gas is routed to the outlet of the evaporator. This hot
gas warms the evaporator, thaws any frost that has
accumulated, condenses into a liquid and flows into
the common liquid line to feed the other evaporators.
In order for this system to work properly, check valves
must be installed to allow flow around the expansion
valves. A pressure reducing valve should be used in the
liquid line to provide a pressure differential between the
condensed refrigerant leaving the defrosting evaporator
and the common liquid line.