Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 61

8-8. Replacement operation
Control modes
1-1. Requirements for starting
1. Start and end of
replacement
operation
1-2. Requirements for ending
2-1. Normal control
2. During replacement
operation
2-2. Indoor frozen prevention control
(RP4 to 6V Only)
Replacement operation will start when SW8-2 on the outdoor controller board
is turned on while units are being stopped.
Replacement operation will end if any of the following conditions is satisfied.
a. 2 hours have passed since replacement operation started.
b. SW8-2 has been turned off.
c. Operation (COOL / DRY / HEAT) has been started and controlled by remote controller.
In COOL operation replacement operation will be conducted by opening the
replacement filter circuit in order to circulate refrigerant.
• Compressor control
The same continuous operation as COOL operation regardless of intake temperature.
• LEV(A)control
Always closed.
• LEV(B)control
The same control as that of COOL operation.
• Fan control
The same control as that of COOL operation.
• Four way valve control
The same control as that of COOL operation. (Always OFF.)
• Solenoid valve
Always opened.
• Others
LED on the outdoor controller circuit board comes ON/OFF per second during
replacement operation.
The compressor will be stopped for 3 minutes if the indoor liquid pipe temperature
(TH2) or indoor condenser/evaporator temperature (TH5) is 3: or less after 10
minutes have passed since the compressor started.
Control details
61
Remarks
w Normal air
conditioning can
be operated even
if SW8-2 remains
ON after the
replacement
operation is
finished.
w Cold air comes
out of indoor unit
because the
replacement
operation is
conducted in
COOL operation.
w
Frozen protection
control may be
activated when the
indoor intake temp.
is 15: or less.