Evaporator - Daikin AGZ 025D Operating & Maintenance Manual

The filter-drier should also be changed if the
moisture indicating liquid line sight glass
indicates excess moisture in the system.
During the first few months of operation the
filter-drier replacement can be necessary if the
pressure drop across the filter-drier exceeds the
Battery
The microprocessor has a battery located
behind the clear plastic bezel. It is a BR2032
with a minimum life of 2 years unpowered. It
would be prudent to replace it on a 2-year
cycle. There is no indication of an eminent
failure.
Liquid Line Solenoid Valve
The liquid line solenoid valves that shut off
refrigerant flow in the event of a power failure
do not normally require any maintenance. The
solenoids can, however, require replacement of
the solenoid coil or of the entire valve
assembly.

Evaporator

The evaporators on AGZ-C models 030 - 130 are
brazed plate type, and on models 140, 160, and
180 they are shell-and-tube type. Other than
78
values listed in the paragraph above. Any
residual particles from the condenser tubing,
compressor and miscellaneous components are
swept by the refrigerant into the liquid line and
are caught by the filter-drier.
The solenoid coil can be checked to see that
the stem is magnetized when energized by
touching a screwdriver to the top of the stem.
If there is no magnetization, either the coil is
bad or there is no power to the coil.
The solenoid coil can be removed from the
valve body without opening the refrigerant
piping after pumpdown. For personal safety,
shut off and lock out the unit power.
The coil can then be removed from the valve
body by simply removing a nut or snap-ring
located at the top of the coil. The coil can then
be slipped off its mounting stud for
replacement.
To replace the entire solenoid valve follow the
steps involved when changing a filter-drier.
cleaning and testing, no service work should be
required on the evaporator.
AGZ 025D through 190D OMM 1166-1