Daikin McQuay AGZ-D, Operating And Maintenance Manual, Page: 77 / 82

OMM 1087 AGZ 025D through 190D 77
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.
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.
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 cleaning and testing, no service work should be
required on the evaporator.