Mitsubishi SRK63ZEA-S1, Technical Manual

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(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22°C or lower continues for 30 seconds while
outdoor speed is other than 0rps.
(b) Detail of operation:
1
The lower limit of inverter command speed is set to 20(30)rps and even if the speed becomes lower than 20(30)rps, the
speed is kept to 20(30)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.
2
The upper limit of control speed is set to 60(50)rps and even if the calculated result becomes higher than that after fuzzy
calculation, the speed is kept to 60(50)rps.
(c) Reset conditions: When the either of the following condition is satisfied
1
When the outdoor air temperature sensor (Th5) becomes 25ºC or higher.
2
When the inverter command speed is 0rps.
(6) High pressure control
(a) Purpose:
Prevents anomalous high pressure operation during heating.
(b) Detector: Indoor heat exchanger sensor (Th2)
(c) Detail of operation:
1
56°C =
<
Indoor heat exchanger temperature < 58°C
The inverter command speed is reduced 2rps at each 20 seconds. When the indoor unit heat exchanger temperature is
58°C or higher but less 61°C, the speed is reduced 4rps at each 20 seconds. The lower limit speed is 30rps. When the
temperature is 61°C or higher for 1 minute continuously, the inverter is stopped.
2
48.5°C =
<
Indoor unit heat exchanger temperature < 56°C
The inverter command speed is been maintained and the operation has continued for more than 20 seconds at the same
speed, it returns to the normal heating operation.
Note (1) Indoor fan retains the fan tap when it enters in the high pressure control. Outdoor fan is operated in accordance with the speed.
(d) Reset conditions: When the indoor heat exchanger temperature is less than 48.5°C
The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the
calculated speed is reached.
(7) Heating overload protective control
(a) Operating conditions : When the unit is operating with the outdoor unit speed other than 0 rps or when the outdoor air
temperature sensor (Th5) rose beyond 22°C for 30 seconds continuously.
(b) Detail of operation:
1
Taking the upper limit of control speed range at 50 rps, if the output speed obtained with the fuzzy calculation exceeds the
upper limit, the upper limit value is maintained.
2
The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy
calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 prs.
3
The outdoor fan is lowered forcibly by 1step. (Lower limit speed is 2nd speed.)
(c) Reset conditions: When the outdoor air temperature drops below 21°C.
22 25
OFF
0 3
Upper limit 50rps
Lower limit 30rps
ON
ON
Upper limit 60rps
Lower limit 20rps
Outdoor air temp.(
°
C)