Indoor Units; Refrigerant Recovery When A Fault Occurs In The Indoor Unit - Sanyo SPW-CR1503GDYH8 Technical Data & Service Manual

2. Indoor Units

2-1. Refrigerant recovery when a fault occurs in the indoor unit

The procedure for refrigerant recovery when replacing or repairing an indoor unit due to a faulty refrigerant recovery
circuit or other cause is shown below. Be sure to perform this procedure correctly.
Start
Fault diagnosis at indoor unit side
Electronic expansion valve or strainer fault
This occurs when refrigerant is recovered
during an internal leak or other fault
Check whether the unit has ball valves
(indoor unit side)
Yes
Cooling operation for all indoor units
Refrigerant recovery operation (1)
Change the indoor unit quantity setting
(including changing of the group control
and central control settings)
Perform power supply processing
Enable normal operation of indoor units
for another system
Replace or repair the faulty unit
Inspect for leaks*
Air purging with a vacuum pump*
Refrigerant charge*
(Inject from the liquid pipe side)
(amount of refrigerant unable to be
recovered)
Change the indoor unit quantity setting
(including changing of the group control
and intensive control settings)
Open the ball valve
Enable operation
End
* Performed from the service port of the indoor unit-side ball valve
When a fault has occurred not requiring
removal of the unit, or when you want
to leave the faulty unit as it is for several
days and operate the normal units.
Has a ball valve
Cooling operation for all indoor units
Refrigerant recovery operation (1)
Change the indoor unit quantity setting
(including changing of the group control
and intensive control settings)
Enable normal operation of other
indoor units (enable long-term operation)
Cooling operation for all indoor units
Refrigerant recovery operation (2)
Turn off indoor and outdoor units
Replace or repair the faulty unit
Inspect for leaks
Air purging with a vacuum pump
Refrigerant charge*
(Inject from the liquid pipe side)
(amount of refrigerant unable to be
recovered)
Turn on indoor and outdoor units
Enable operation
End
VII - 17
Replacement of Main Units
Check whether the
unit has ball valves (indoor unit side)
Provided in each
system or none
Short-circuit the indoor unit control PCB
check 2P pin (CA5).
The low drain pump is turned on.
Operation is not performed if there is a
fault in the transformer, microcontroller
or fuse.
When the fan and drain
pump do not operate
Connect the fan motor lead wire to the
forced execution connector side (yellow)
for fan and drain pump operation.
(Operation is not performed if there is
a fault in the fuse or a broken wire.)
When the fan and drain
pump do not operate
Manually close the electronic expansion
valve. (Turn the coil clockwise about
eight times.)
Change the indoor unit quantity setting
Group control and intensive control
Enable normal operation of other indoor
units (However, since a fault may occur,
try to repair the faulty unit as quickly as
possible.)
End
TD831077
7
1876_M_I