Elektronika SCM60ZD-S Manual page 37

(g) Start of protection for compressor
Compressor protection starts when the operation mode changes from stop to cooling or heating and the decision speed is
other than 0 rps.
(i) Start of protection I (Operation mode: cooling; Decision speed: other than 0 rps)
1) If the decision speed is 30 rps or higher, it runs for 1 minute 45 seconds at 30 rps, then changes to the decision speed.
2) After 1) above, if the decision speed is 54 rps or higher, it runs for 5 minutes at 54 rps, then changes to the decision
speed.
3) If the compressor is restarting after a thermostat stop, the protection function for the indoor unit operates and Start of
protection I is not executed.
(ii) Start of protection II (Operation mode: heating; Decision speed: other than 0 rps)
1) If the decision speed is 30 rps or higher, it runs for 1 minute 45 seconds at 30 rps, then changes to the decision speed.
2) After 1) above, if the decision speed is 38 rps or higher, it runs for 3 minutes at 38 rps, then changes to the decision speed.
3) After 2) above, if the decision speed is 46 rps or higher, it runs for 4 minutes at 46 rps, then changes to the decision speed.
4) After 3) above, if the decision speed is 54 rps or higher, it runs for 5 minutes at 54 rps, then changes to the decision speed.
(iii)Low load start
In order to assure that oil is supplied to the compressor and 4-way valve changes smoothly.
Cooling
If the decision speed is below 20 rps, it runs at 20 rps for 60 seconds, then changes to the decision speed.
Heating
If the decision speed is below α1 rps, it runs at α1 rps for 5 minutes, then changes to the decision speed.
• Value of α1
SCM60ZD-S
(h) Heating overload protection control
Indoor unit side
(i) Operating conditions : When the outdoor unit is heating at a decision speed other than 0 rps and the outdoor air
temperature (detected by Th
(ii) Detail of operation
a) Indoor fan speed is raised forcibly by 1 step.
b) Taking the upper limit of control speed range at 80 (50, 60 type: 60) rps, if the indoor command speed exceeds the
upper limit, the upper limit value is maintained.
(iii)Reset condition: When the outdoor air temperature drops below 16ºC.
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 or more for 30 continuous seconds, current safe control is performed.
Operation is restored when the outdoor temperature is 12 °C or less.
(i) Cooling overload protection control
During cooling operation, if the outdoor unit is operating at a decision speed other than 0 rps and the outdoor temperature is
39 °C or more for 30 continuous seconds, current safe control is performed by turning the outdoor fan motor is forcedly set
on Me. Operation is restored when the outdoor temperature is 38 °C or less.
(j) Heating low temperature protection control
<I>
(i) 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 4ºC or lower for 5 minutes continuously.
(ii) Detail of condition: When the decision speed is lower than 20 rps, the decision speed is forcedly raised to 20 rps.
(iii)Reset condition: When the temperature of the outdoor air sensor is higher than 6ºC.
<II>
(i) 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 0ºC or lower for 5 minutes continuously.
(ii) Detail of condition: The outdoor fan speed is raised forcibly by 1 step.
(iii)Reset condition: When the temperature of the outdoor air sensor is higher than 2ºC.
During heating overload protective control (Tho-A > = 14°C)
23 rps
-A) rose beyond 17ºC for 2 minutes continuously.
O
Before heating overload protective control (Tho-A<14°C)
34 rps
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