Daikin LX10F10A, Service Manual

Page: 110 / 126

4-21
4.8.12 Solenoid Valve
4 Solenoid Valves using in this unit use a common
coil and body.
Name Symbol Boby Coil
Liquid solenoid Valve LSV
VPV-
803DQ NEV-
M0AB518C
Economizer solenoid Valve ESV
Hot gas solenoid Valve HSV
Reheat coil solenoid Valve RSV
(1) Replacing the coil
① Remove the lead wire connector from the inside
of the control box, and cut and recover the
binding band which fastens the lead wire.
② Remove the hexagonal head bolt on the top of
the coil to pull the coil out.
③ Replace the coil with a new one and restore
the hexagonal head bolt, the binding band and
connector on the original position.
When reassembling the coil, the tightening
torque should be 1.2 N
・ m (12.2 kg ・ cm).
②
Hexagon head bolt ① Lead wire
④ Valve body
③ Coil
(2) Replacing the valve body
① Remove the hexagonal head bolt on the top of
the coil to pull the coil out.
② Remove the hexagonal head bolt of the fixing
plate, and cut the two pipes at the side of the
valve body.
Disconnect the remaining pipes at the brazed
joint sections.
③ Insert the new valve body into the pipe and conduct
brazing while keeping the temperature of the valve
body below 120
℃ (248 F) by cooling.
④
Install the coil and restore the hexagonal head
bolt of the fixing plate and the connector into their
original position.
⑤ Hexagon head bolt for fixing plate ① Hexagon head bolt
② Coil
③ Valve body
④ Fixing plate
4.8.13 Drier
The drier automatically absorbs moisture in the refrigerant
while it is circulated. It also commonly works as a filter to
remove dust in the refrigerant. Replace the drier if it does
not absorb moisture, is blocked, or if the system has been
opened to the atmosphere. When installing the new drier,
follow the arrow and do not make any mistake about the
installation direction of the drier.
(1) Replacement procedure
① Conduct the automatic pumpdown to collect
the refrigerant in the liquid receiver.
Refer to paragraph 4.2 for the automatic pumpdown.
② Then, quickly replace the drier with a new one
after loosening the flare nuts on the inlet and
outlet side of the drier.
③ After completing of the replacement of the drier,
be sure to conduct refrigerant leakage test to
confirm that no refrigerant leakage is occurring.
④ Check on the green color of the sight glass after
system operation has started.
⑤ Apply silicon sealant to the drier body including
the flare nuts on the inlet and outlet sides.
Outlet
flare
nut
Inlet
flare
nut
Fully apply silicon sealant to
the drier body including the
flare nuts on the inlet and
outlet sides.
When put under low
temperature and pressure by
some operation conditions,
①
and ② might have the threads
damaged by frozen dew
drops.
③ may become rusty as a
result of coating peel-off at
work using a spanner.
①
②
③
4.8.14 Fusible Plug
Receiver
Fusible plug
① Cap
② Body
③ Fusible plug
●
Replacement of fusible plug
If pressure rises abnormally in the refrigeration
circuit, the fusible plug is automatically activated,
so, thoroughly check the possible causes if the
fusible plug melts.
If the fusible plug is activated, the fusible alloy
① melts
and refrigerant blow out (Melting point: 95 ℃ to 100 ℃ ).
For replacement, ① - ③ shall be replaced.
①
②
③