Electronic Expansion Valve - Daikin LXE10E-A Service Manual

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4.2.4 Electronic expansion valve

● Model Coil : EBM-MD12DM-1
Body : EDM-B804DM-1
This unit adopts an electronic expansion valve.
The electronic expansion valve controls the
optimum refrigerant flow rate automatically,
using the temperature sensor at the evaporator
inlet and outlet pipes.
In case of emergency including controller
malfunctions, refer to the chapter of
troubleshooting, section 6.5, Emergency
operation.
(1) Replacing the coil
q Cut the binding bands which fasten the coil
and the lead wires.
w Disconnect the lead wire of the coil from the
controller.
e Remove the silicon sealant on the lock nut.
r Loosen the lock nut, then remove the coil
from the body.
t Remove the remaining "Lock-tight" on the
lock nut moonting threads of the body. Then,
apply new "lock-tight".
y Install a new coil. Apply the small amount of
"Lock-tight" to the threads of EV body (Don't
apply too much "Lock-tight".) The tightening
torque for installation is 7.0 to 15.0 N m (73
to 156kgf cm).
u Seal the lead wire and connector with butyl
rubber tape. Restore the binding bands and
the lead wire connector into the original state.
Vinyl tube
(2) Replacing the body
Binding band
q Coil
w Lock nut
e Body
4-15
q Loosen the lock nut, then remove the coil.
(Put two wrenches onto the locknut and the
unit to remove the coil.)
w Remove the hexagonal head bolts, and cut
the pipe on the body, then remove remaining
pipes from brazing parts.
e Connect a new body to the pipes. Be sure to
conduct brazing work while cooling the body
below 120˚C (248˚F) by using wet cloths.
r Fix the body to the mounting base.
t Remove the cap, and attach the coil. Apply
"Lock-tight" to the lock nut mounting threads,
and mount the coil.
The tightening torque for installation is 7.0 to
15.0 N m (73 to 156kgf cm).
y After replacing, carry out refrigerant leakage
check, and make sure that there are no leaks.
e Mounting base
u Apply a sillicon sealant to the lock nut section.
Seal using with
sillicon Sealant
q Coil
w Lock nut
y Cap
t Body
r Hexagon
head bolt