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NOTE: Reversing valve assemblies will come
complete with tubing, so excess heat will not be
applied to the valve body.
Tank
On 7k and 9k heat pump models, a receiver tank is
included in the sealed system. This tank is soldered
to the outdoor coil return line tube.
Check Valve
one way unimpeded, but in heat pump mode it
closes and forces the refrigerant to go through
an additional length of capillary tube. This helps
balance the refrigerant system.
NOTE: Care must be taken when soldering in the
new check valve. Thermal paste and a damp rag
must be used on the middle portion of the assembly
to prevent thermal damage to the internal check
ball assembly.
Sealed System Common
Drier
All Zonelines will now have a drier factory installed.
The drier must be replaced anytime sealed system
repairs are performed.
NOTE: Driers are vacuumed packed and should only
be opened when it is being installed. Driers opened
and left to the open air become saturated and
should be discarded if not used within 45 minutes.
Heat Pump Drier Kit
(includes check valve, drier, capillary jumper and
Since R410a has a much higher operating
pressures, a pressure switch has been added to the
compressor discharge line and will remove power
to the compressor if the sealed system pressure
was determined that the pressure switch was not
required. The pressure switch will be bypassed
electrically if it fails open. It will also be removed
from the sealed system if it causes refrigerant
noise. A kit will be used for either scenario (Part #:
WP56X21582).
Thermal Cut-Out
In addition to the pressure switch, which is in series
with the compressor L1 wiring, a thermal fuse to
protect the housing area is in line to the compressor
L2 wiring. The compressor circuit is still protected
with an overload in the compressor cover.
– 45 –
process stub)
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