Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 172

6) Heating overload protective control
a) Operating conditions: When the ambient air temperature (Th5) is 17˚C or higher continues for 30 seconds
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 The outdoor fan is set on 2nd speed.
c) Reset conditions: The ambient air temperature (Th5) is lower than 16˚C.
7) Heating low outdoor temperature protective control
◆
<I>
a) Operating conditions: When the ambient air temperature (Th5) is lower than 4ºC or higher than 13ºC continues
b) Detail of operation: The lower limit of inverter command speed is change as shown in the fiqure below.
-8 -6
c) Reset conditions: When either of the following condition is satisfied.
1 The ambient air temperature (Th5) becomes 6ºC or higher and 11ºC or lower.
2 The inverter command speed is 0 rps.
◆
<II>
a) Operating conditions: When the outdoor heat exchanger (Th4) is –10ºC or lower continues for 10 minutes while
b) Detail of operation: When the inverter command speed upper limit is set at 120 rps.
c) Reset conditions: When either of the following condition is satisfied.
1 The outdoor heat exchanger (Th4) is -7ºC or higher.
2 The inverter command speed is 0 rps.
3 After 2 minutes have passed since this control started.
while the inverter command speed other than 0 rps.
for 30 seconds while the inverter command speed is other than 0 rps.
4 6 11
Ambient air temp.(°C)
the inverter command speed is other than 0 rps.
165
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Lower limit 45 rps
Lower limit 32 rps
Normal operation
13
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