Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

Page: 180 / 315

- 178 -
Service
‘19 • HM-T-340
4) Minimum required frequency under high condensing saturated temperature condition.
According to the outdoor heat exchanger temperature (Tho-R) , minimum required frequency in cooling mode is changed
as per A or B in below table.
And according to the condensing saturated temperature (CST) detected by indoor unit pressure sensor (BP4) or liquid pipe
temperature (Thi-L) detected by indoor unit temperature sensor (BT15), whichever is higher, minimum required frequency
in heating mode is changed as per C or D in below table.
Model FDCW71VNX FDCW100VNX FDCW140VNX
Cooling mode
A rps 30 − 30
B rps 40 − 40
Heating mode
C rps 30 25 30
D rps 40 35 40
5) Minimum required frequency adjustment under outdoor air temperature (Tho-A) condition
According to the outdoor air temperature, minimum required frequency is off set by as per below table.
Model FDCW71VNX FDCW100VNX FDCW140VNX
Cooling mode
A1 0
A2 +15
Heating mode
A3 0 0 0
A4 0 +10 +5
A5 +10 +20 +15
A6 +20 +30 +25
6) When any of the controls from 1) - 5) above may duplicate, whichever the smallest value among duplicated controls is
taken as the maximum required frequency, and whichever the biggest value is taken as the minimum required frequency.
Compressor start control
1) Compressor starts upon receipt of the thermostat ON signal from the indoor unit
2) However, at initial start-up after turning the power circuit breaker on, the compressor may enter the standby state for
maximum 30 minutes in order to prevent from dry-up of oil in the compressor.
<Cooling mode>
Normal Normal
<Heating mode>
FDCW71VNX FDCW71VNX
FDCW100VNX FDCW100VNX
FDCW140VNX FDCW140VNX
Tho-R
CST or Thi-L whichever higher
A rps
B rps
C rps
D rps
39 41 49
43 45 49 51
39 50 52
36
43
45
38
41
52 54
52
−
− − −
50
51
（
°C
）
（
°C
）
(rps)
Operation control function by the outdoor unit control
Outdoor air temperature (°C) Outdoor air temperature (°C)
A1
A2
5
10
A6
A5
A4
A3
-20 -15
-10 -5
0
2
<Cooling mode> <Heating mode>