Specifications
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67
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(10) Heating overload protection control
Indoor unit side
(a) Operating conditions: When the outdoor unit is heating at a decision speed other than 0 rps and the outdoor air tempera-
ture (detected by Th
O-A) rose beyond 17°C for 2 minutes continuously.
(b) Detail of operation
1) Indoor fan speed is raised forcibly by 1 step.
2) Taking the upper limit of control speed, if the indoor command speed exceeds the upper limit, the upper limit value is
maintained.
(c) Reset conditions: When the outdoor air temperature drops below 16°C.
Outdoor unit side
During heating operation, if the outdoor unit is operating at a decision speed other than 0 rps and the outdoor temperature is
14°C (SCM40 type: 13°C) or more for 30 continuous seconds, current safe control is performed.
Operation is restored when the outdoor temperature is 12°C or less.
(11) Heating low temperature protection control
<I>
(a) Operating conditions: When the outdoor unit is heating at a decision speed other than 0 rps and the temperature of the
outdoor air sensor is 4°C or lower for 5 minutes continuously.
(b) Detail of condition: When the decision speed is lower than A rps, the decision speed is forcedly raised to A rps.
(c) Reset condition: When the temperature of the outdoor air sensor is higher than 6°C.
• Value of A
<II>
(a) Operating conditions: When the outdoor unit is heating at a decision speed other than 0 rps and the temperature of the
outdoor air sensor is 0°C (SCM45, 48 type: -2°C) or lower for 5 minutes continuously.
(b) Detail of condition: The outdoor fan speed is raised forcibly by 1 step.
(c) Reset condition: When the temperature of the outdoor air sensor is higher than 2°C (SCM45, 48 type: 0°C).
<III>
The compressor’s speed is controlled in accordance with the outdoor heat exchanger temperature and outdoor air temperature.
(12) Current safe control
(a) When converter in port current is detected at the current sensor (CT) and it exceeds the set amperage, the decision speed is
reduced. This is rechecked after one second and if it still exceeds the set amperage, the decision speed is reduced 2 rps.
(b) If the decision speed operated at A rps or less, the compressor is stopped. It is restarted after a 3 minute delay.
• Values of A
(13) Current cut
This detects converter output current at the shunt resistor and if it exceeds the set value, the compressor is stopped. It is restarted
after a 3 minute delay.
(14) Outdoor fan motor protection
If the outdoor fan motor has operated at 75rpm or under for more than 30 seconds, the inverter and fan motor are stopped.
Model
A
35 rps
SCM40ZG-S
30 rps
SCM45ZG-S
30 rps
SCM48ZG-S
22 rps
SCM60ZG-S
20 rps
SCM80ZG-S
Model
A
35 rps
SCM40ZG-S
22 rps
SCM45ZG-S
22 rps
SCM48ZG-S
22 rps
SCM60ZG-S
20 rps
SCM80ZG-S