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3 Startup Control
3.1 Compressor Startup Delay Control
In initial startup control and in restart control (except in oil return operation and defrosting operation), compressor startup
is delayed such that a minimum of the set re‐start delay time has elapsed since the compressor stopped, in order to
prevent frequent compressor on/off and to equalize the pressure within the refrigerant system. The compressor re‐start
delays for cooling and heating modes are set on the user interface. Refer to the M‐Thermal Split Engineering Data Book
Part 3, 8.5 "COOL MODE SETTING Menu" and Part 3, 8.6 "HEAT MODE SETTING Menu".
3.2 Compressor Startup Program
In initial startup control and in re‐start control, compressor startup is controlled according to outdoor ambient
temperature. Compressor startup follows one of two startup programs until the target rotation speed is reached. Refer to
Figure 3‐3.1, Figure 3‐3.2.
Figure 3‐3.1: MHA‐V4(6, 8,10)W/D2N8 compressor startup program
Compressor rotation speed (rps)
38rps
40s
Notes:
1.
Once the first, 40‐second stage of the program is complete, the program proceeds to the subsequent stages in a step‐by‐step fashion and exits when the
target rotation speed has been reached.
Figure 3‐3.2: MHA‐V4(6, 8,10)W/D2N8 compressor startup program
Compressor rotation speed (rps)
38rps
40s
0
Notes:
1.
Once the first, 40‐second stage of the program is complete, the program proceeds to the subsequent stages in a step‐by‐step fashion and exits when the
target rotation speed has been reached.
201909 17
66rps
56rps
42rps
32rps
40s
40s
60s
42rps
36rps
32rps
60s
90s
90s
Midea CAC Confidential
1
when ambient temperature is above 3°C
82rps
70rps
120s
120s
40s
1
when ambient temperature is at or below 3°C
70rps
66rps
56rps
120s
40s
40s
M‐Thermal Split
Target rotation speed
Target rotation speed
82rps
120s
Time (s)
Time (s)
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