Operation Flowcharts Si33-105
140 Troubleshooting R407C PLUS Series Heat Recovery System
Preset temperature
Intake air temperature
a = b = 1 (a = b = 0.5 possible for FXYCP, FXYFP, FXYHP, FXYKP only.)
Cooling operation
Auxiliary electric heater (K1R): OFF
Humidifier (Hu) : OFF
Auxiliary electric heater (K1R): OFF
Program dry display: Cancelled Normal operation
Set direction of air flow
Swing flap?
Recycling guard timer
ON (5 minutes)
Program dry on/off? Program dry in operation
Moisture prevention
condition?
Moisture prevention position
Cassette: P1
Suspended :P0
YES
YES
NO
OFF
NO
Yes
ON
YES
YES
H
4
H
5
H
6
(Option)
(Option)
NO
Fan M1F operating at set
volume of air flow
Drain-up kit M1P : OFF after 5
minutes residual operation
Frost
prevention operation
in progress?
Test run in progress?
Thermostat status?
(Option)
Drain-up kit M1P : ON
OFF
(Option)
Drain-up kit M1P : OFF after 5
minutes residual operation
Electronic expansion valve
Y1E : OFF
Thermostat on operation signal to
outdoor unit: Cancelled
Electronic expansion valve Y1E:
Capacity control
Thermostat ON operation signal
to outdoor unit: Output
Drain-up kit M1P : ON
A
(VF022)
NO
NO
"
4 If the evaporator inlet temperature is -5°C or lower for a total of 10 minutes, or is -1°C or
lower for a total of 40 minutes, frost prevention operation is initiated. Normal operation
resumes when the temperature is +7°C or higher for 10 consecutive minutes.
"
5 Thermostat status
"
6 The drain-up kit is standard equipment for models FXYCP, FXYFP, FXYKP and FXYSP.
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