WARNING
• Design and install external heater appropriately with considering its protection.
• Inappropriate designing and installation of external heater may cause a fire by emitted heat from
the external heater.
• Fujitsu General Ltd. is not responsible for inappropriate designing or installation of external
heating device.
Auxiliary heater control 1
Operation
Condition
Heater on
Heater is on as shown in following diagram of heating temperature.
Heater off
• Heater is off as shown in following diagram of heating temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Fan stop protection
• Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of external heaters).
• All control temperatures will shift by adjusting “Thon”.
Off
Off
On
Tr-Ts ≥ -1.8°F
(-1°C)
Tr-Ts
Tr-Ts (=Thon) < -5.4°F
(
-3°C)
Tr-Ts ≥ -18°F
(-10°C
)
Tr-Ts < -21.6°F (-12°C)
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
Example:
When set temperature (Ts) is 72°F (22°C) (Factory setting),
• and room temperature (Tr) increases above 53.6°F (12°C), signal output is on.
• and room temperature (Tr) increases above 69.8°F (21°C), signal output is off.
• and room temperature (Tr) decreases below 66.2°F (19°C), signal output is on.
• and room temperature (Tr) decreases below 50°F (10°C), signal output is off.
Auxiliary heater control 2
Operation
Condition
Heater on
Heater is on as shown in following diagram of heating temperature.
Heater off
• Heater is off as shown in following diagram of heating temperature.
• Other than heating mode
• Error occurred
• Forced thermostat off
• Fan stop protection
• Temperature of heater on (Thon): Adjustable by function number 62 (Operating temperature
switching of external heaters).
• All control temperatures will shift by adjusting “Thon”.
Off
On
Tr-Ts ≥ -1.8°F
(-1°C)
Tr-Ts
Tr-Ts (=Thon) < -5.4°F
(
-3°C)
Tr: Room temperature
Ts: Set temperature
Thon: Heater on temperature
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8-4. Details of function
8. External input and output
W
A
LL
MO
U
N
TED
A
SU
H
30
-3
6L
PA
S
W
A
LL
MO
U
N
TED
A
SU
H
30
-3
6L
PA
S