16
Freeze prevention control
Anti-frost heater operation flow
Exhaust thermistor
normal
Exhaust thermistor
Less than 37
35
Heaters turn ON
YES
YES
NO
NO
Heaters turn ON
Exhaust thermistor
F or higher
NO
Has 50 min passed
Exhaust thermistor
Less than 37
YES
YES
YES
NO
NO
Heaters turn OFF
DV or SV conversion
model
NO
YES
33
YES
NO
21
YES
NO
30
Heat exchanger thermistor
normal
Air inlet thermistor
normal
X < 41 F
or
Y < 37 F
X = Heat exchanger thermistor
Y = Air inlet thermistor
Y < 28 F
Heaters turn ON
Has 50 min passed
Heaters turn OFF
Has 5 min passed
Heaters turn ON
Has 20 min passed
Heaters turn OFF
Has 15 min passed
A
A
YES
YES
YES
YES
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO
X
41 F
and
Y
14 F
A
YES
NO
X
41 F
and
Y
14 F
X
41 F
and
Y
14 F
NO
NO
YES
X
41 F
and
Y
14 F
Fan motor operation flow
Exhaust thermistor
18
Fan Turn ON
< 1,200 rpm >
3 minutes
Fan speed
1,200
500rpm
61
Exhaust thermistor
32
Fan Turn OFF
No error code 61
Exhaust thermistor
46
Fan Turn OFF
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Heat exchanger thermistor
68
NO
YES
Fan motor operation flow ( SV conversion )
Exhaust thermistor
32
Fan Turn ON
< 2,000 rpm >
Exhaust thermistor
higher than 14
Fan speed
Target
500rpm
61
Fan Turn OFF
No error code 61
Exhaust thermistor
46
Fan Turn OFF
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Heat exchanger thermistor
68
NO
YES
Air inlet thermistor
Higher than 32
Fan Turn ON
< 1,200 rpm >
Exhaust thermistor
X or higher
NO
* 4 When fan speed is 1,200rpm, X = 46 F.
* 2
When fan speed is 2,000rpm, X = 59 F.
* 4
YES
NO
YES
Fan motor stopped
YES
NO
Air inlet thermistor
Higher than 35
Air inlet thermistor
32
Fan speed
set 2,000 rpm
Fan speed
set 1,200 rpm
YES
NO
YES
NO
21
Summary of Contents for EN18WI30LS
Page 8: ...EN19WI30LS EP19WI30LS 8 ...