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(7) Heating Operation
(a) Summary
1) Capacity control
Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capacity
of the outdoor unit, the demand capacity will be proportionally distributed.
2) Outdoor unit frequency control (30 ~ 104Hz)
The decision frequency is based on the total indoor demand frequency as follows:
Indoor demand frequency total
30 Hz or less
More than 30 Hz, but 104 Hz or less
More than 104 Hz
Note (1) The total indoor demand frequency is based on the value for each of the units shown in item (b).
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion
coefficient to the indoor unit demand frequency.
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
Note (1) The values in parenthesis ( ) indicate SRRM40HENG-L.
(c) Operation of Major Functional Components in Heating Mode
Operation
Functional
components
Demand frequency
See preceding table
Fixed
According to mode switching
Indoor
unit fan
Automatic
According to demand frequency
Outdoor unit fan
According to decision frequency
Electronic
According to decision
expansion valve
frequency
(EVA, B, C, D)
Compressor
(d) Hot Standby (When any of the following conditions is met, Hot Standby operation is activated.)
(i)
Operating conditions
1 When 4 seconds have passed since the power was turned on.
2 Under the following conditions.
a When the temperature detected by the outdoor air temperature thermistor is at the ON level as shown in
the figure, and when 30 continuous minutes have passed since the decitsion frequency has become 0
Hz after cooling or heating has been stopped.
b When 20 minutes have passed since the power was turned on and the outdoor air temperature thermistor is in
the ON range.
(ii) Function
Low voltage is applied from the inverter to the compressor to preheat it. This melts and vaporizes refrigerant that has frozen
inside the freezer oil, making it easier for the refrigerant to circulate when the heating operation is started. This makes the
start of the heating operation faster.
78
Model
SCM80ZA
Capacity
2.0 ~ 10.8 kW
22
25
30 ~ 32
30
30
30 ~ 32
30
30
30
30
30
32
30
30
Thermostat OFF
Heating
(All indoor units)
0
(All indoor units)
OFF
OFF
OFF
According to stop mode
ON
OFF
Decision frequency
30 Hz
30 to 104 Hz
104 Hz
28
32
30 ~ 48
30 ~ 50
30 ~ 48
30 ~ 50
30 ~ 34
30 ~ 36
30 ~ 50 (30 ~ 44)
30
30
48
48
30
30
Thermostat OFF
Stop, abnormal stop
(Some of indoor units)
(Some of indoor units)
0
0
(Thermostat off units)
(Stop, abnormal stop units)
OFF
OFF
According to decision frequency
100 Pulses
100 Pulses
(Thermostat off units)
(Stop, abnormal stop units)
ON
ON
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40
50
30 ~ 54
30 ~ 60
30 ~ 54
30 ~ 60
30 ~ 44
30
30
50 (54)
58
30
30
Failure
(Outdoor Unit)
0
(All units)
Hot Keep
Hot Keep
OFF
According to stop mode
OFF
ON
OFF
22°C
24°C
Outdoor air temperature
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