GE AZ45E07DA Series, Техническое обслуживание руководство, Страница: 34 / 64

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Thermistors
Thermistors provide temperature feedback to the
main board to maintain proper room temperature
and operating conditions of the sealed system.
On heat pump models (AZ65), thermistors also
provide outdoor air temperature and outdoor coil
temperature in order for the main board to operate
the Zoneline by the most e
Ȼ cient means.
Lo Z Voltage Transformer
A separate transformer provides low voltage for the
main board and also the wall thermostat. A built-in
resettable fuse circuit is enclosed in the transformer;
this prevents the transformer from becoming
defective if the wires are shorted.
RJ-45
A RJ-45 connector is mounted to the printed circuit
side of the main board to provide a way to easily
update software or to hook up other monitoring
devices. It is accessible by removing the front cover
of the Zoneline.
Fan Motors
Both the indoor and outdoor fan motors are DC
motors driven by the main board and provide
feedback to the main board for proper speed
con
¿ rmation.
Heater
All models of the new Zoneline have a three bank
heater assembly. They have two thermal switches
to protect the circuit, one is a cycling thermal switch
and the other is a "one-shot" thermal switch.
Sealed System
As with any refrigeration system, Zonelines have an
indoor coil, outdoor coil, compressor and refrigerant
metering device (capillary tubes). A drier is part of
the sealed system now included from the factory.
Additionally on heat pump models (AZ65), a
reversing valve to switch the À ow of refrigerant and
a check valve to balance the system are parts of the
sealed system.
A "tank" is part of some sealed systems in the
Zoneline models. The tank allows for expansion of
the refrigerant where required.
NOTE : A new drier MUST be installed anytime a
sealed system is repaired.
Also, because R410a has 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
becomes too high.
In addition to the pressure switch, which is in series
with the compressor L1 wiring, two fuses are also in
line with the compressor L2 circuit, one is a thermal
fuse to protect the housing area and a 30 amp fuse,
both in line to the compressor. The compressor
circuit is still protected with an overload in the
compressor cover.
Po Z er Cords
The new Zonelines have new power cords (sold
separately). Three amperage ratings are available:
15 Amp ( Part # : RAK315P), 20 Amp ( Part # :
RAK320P), and 30 Amp ( Part # : RAK330P). All cords
will have the LCDI protector built in.
In addition, the 20 and 30 amp cords will have a
separate heater-enabling jumper that plugs into
the main board which limits the heater wattage
according to house supply limitations. If this jumper
is not connected, the heater circuit will be limited to
15 amp operation.
ICR Pump
On some Zoneline models, an Internal Condensate
Pump is mounted into the outer base pan. As with
previous ICR models, this pump is designed to pump
condensate water, which accumulates from the
outdoor coil when in heat pump mode, up to the
top of the indoor coil and allows the water to trickle
down the coil to evaporate. This process cuts down
on excessive water
À owing out of the rear of the
Zoneline and adds moisture to the indoor air.
Make-Up Air Module
Some models will have a separate module that
conditions air from the outside before it enters the
room through the duct door. This module consists
of an R134a dehumidi
¿ er with all the components
enclosed into one package. This is not a serviceable
part and is replaced as a complete module
assembly. This is a new requirement of building
codes in some areas.
Reversing Valve Solenoid
See the Sealed System Heat Pump section of this
service guide.