Liquid Line Solenoid Valve - Daikin AGZ070EH Installation, Operation And Maintanance Manual

Cooling the recovery cylinder will speed recovery and lessen
stress on recovery equipment.
!
Service on this equipment is to be performed by qualified
refrigeration personnel familiar with equipment operation,
maintenance, correct servicing procedures, and the safety
hazards inherent in this work. Causes for repeated tripping of
equipment protection controls must be investigated and
corrected.
Disconnect all power before doing any service
inside the unit.
Servicing this equipment must comply with the
requirements set forth by the EPA in regards to
refrigerant reclamation and venting.
Filter-Driers
Replace the filter-drier any time excessive pressure drop
is read across the filter-drier
and/or when bubbles occur in the sight glass with normal
subcooling. The maximum recommended pressure drops
across the filter-drier are shown below.
Table 22, Filter-Drier Pressure Drop
MAXIMUM RECOMMENDED
PERCENT CIRCUIT
PRESSUREDROP ACROSS
LOADING (%)
FILTER DRIER PSIG (KPA)
100%
75%
50%
25%
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 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.
IOM 1206-1
WARNING
10 (69)
8 (55.2)
5 (34.5)
4 (27.6)
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.
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-E models 030 - 070 are brazed
plate type. Other than cleaning and testing, no service
work should be required on the evaporator.
Unit Maintenance
71