Mitsubishi SRK50ZHX-S Technical Manual page 20

(6) Heating overload protective control
(a) Operating conditions : When the outdoor air temperature (Th5) is 17˚C or higher continues for 30 seconds while the
(b) Detail of operation:
1 Taking the upper limit of inverter command 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 inverter command speed is set to 35 rps and even if the calculated result becomes lower than that after
fuzzy calculation, the speed is kept to 35 rps. However, when the thermo becomes OFF, the speed is reduced to 0 prs.
3 Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at 35
rps.
4 The outdoor fan is set on 2nd speed.
5 The indoor fan is stepped up by 1 speed step. (Upper limit 8th speed)
(c) Reset conditions: The outdoor air temperature (Th5) is lower than 16˚C.
(7) Heating low outdoor temperature protective control
(a) Operating conditions: When the outdoor air temperature (Th5) is lower than 4ºC or 13˚C or higher continues for 30
(b) Detail of operation:
-8 -6
(c) Reset conditions:
1 The outdoor air temperature (Th5) becomes 6ºC ~ 11˚C.
2 The inverter command speed is 0 rps.
inverter command speed other than 0 rps.
seconds while the inverter command speed is other than 0 rps.
The lower limit inverter command speed is change as shown in the figure below.
4 6 11
Outdoor air temp.(°C)
When either of the following condition is satisfied.
Lower limit 45 rps
Lower limit 32 rps
Normal operation
13
17
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