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(5)
Remote control display during the operation stop
When the operation is stopped (the power source is turned ON), it displays preferentially the "Room temperature", "Center/
Remote", "Filter sign", "Inspection" and "Timer operation".
(6)
Hot start (Cold draft prevention at heating)
(a) Operating conditions
When either one of following conditions is satisfied, the hot start control is performed.
(i) From stop to heating operation
(ii) From cooling to heating operation
(iii) Form heating thermostat OFF to ON
(iv) After completing the defrost operation (only on units with thermostat ON)
(b)
Contents of operation
(i) Indoor fan motor control at hot start
1) Within 7 minutes after starting heating operation, the fan mode is determined depending on the condition of
thermostat (fan control with heating thermostat OFF).
a)
Thermostat OFF
i) Operates according to the fan control setting at heating thermostat OFF.
ii) Even if it changes from thermostat OFF to ON, the fan continues to operate with the fan control at thermostat
OFF till the heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 35°C or higher.
iii) When the heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 35°C or higher, the fan operates with
the set air flow volume.
b)
Thermostat ON
i) When the heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 25°C or lower, the fan is turned OFF
and does not operate.
ii) When the heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 25°C or higher, the fan operates with
the fan control at heating thermostat OFF.
iii) When the heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 35°C or higher, the fan operates with
the set air flow volume.
c) If the fan control at heating thermostat OFF is set at the "Set air flow volume" (from the remote control), the fan
operates with the set air flow volume regardless of the thermostat ON/OFF.
2) Once the fan motor is changed from OFF to ON during the thermostat ON, the indoor fan motor is not turned OFF
even if the heat exchanger sensor detects lower than 25°C.
Note (1) When the defrost control signal is received, it complies with the fan control during defrost operation.
3) Once the hot start is completed, it will not restart even if the temperature on the heat exchanger sensor drops.
(ii) During the hot start, the louver is kept at the horizontal position.
(iii) When the fan motor is turned OFF for 7 minutes continuously after defrosting, the fan motor is turned ON regardless
of the temperatures detected with the indoor heat exchanger sensors (Thi-R1, R2).
(c)
Ending condition
(i) If one of following conditions is satisfied during the hot start control, this control is terminated, and the fan is operat-
ed with the set air flow volume.
1)
Heat exchanger sensor (Thi-R1 or R2, whichever higher) detects 35°C or higher.
2)
It has elapsed 7 minutes after starting the hot start control.
(7)
Hot keep
Hot keep control is performed at the start of the defrost operation.
(a)
Control
(i) When the indoor heat exchanger temperature (detected with Thi-R1 or R2) drops to 35°C or lower, the speed of
indoor fan is changed to the lower tap at each setting.
(ii) During the hot keep, the louver is kept at the horizontal position.
(b) Ending condition
When the indoor fan is at the lower tap at each setting, it returns to the set air flow volume as the indoor heat exchanger
temperature rises to 45°C or higher.
170
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'18 • SCM-T-251
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Troubleshooting
