Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 120

(5) Heating high pressure control
(a) Starting condition
When the indoor heart exchanger temperature (Thi-R) has risen to a specified temperature while the compressor is turned on.
(b) Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following
table.
Protection control speed (NP)
Sampling time (s)
NP
NP<50
50≦NP<115
115≦NP<120
120≦NP
(6) Heating overload protective control
(a) Operating condition
(b) Detail of operation
(i)
(ii)
fuzzy calulation, the speed is kept to 30(40) rps. However, when the thermostat OFF, the speed is reduced to
0 rps.
(iii)
40 rps.
(iv) The outdoor fan speed is stepped down by 3 speed step.(Low limit 2nd speed)
(c)
Reset condition
Upper 90 rps
Lower 30 rps
OFF
11 13
Outdoor air temperature(ºC)
Thi-R<P1 P1≦Thi-R<P2 P2≦Thi-R<P3
Normal Retention
Normal
Thi-R P1 P2
45 52
45 52
45-43 52-50
43 50
13
H
30(40) rps
H 11
Upper 75 rps
Lower 40 rps
16 17
-
P3≦Thi-R
NP-4rps
10 10
Unit:°C
P3
54.5
57
57-55
55
90(75) rps
119
-
'19 • PAC-T-327
NP-8rps
10
speed is
than that after