Midea HB-A60/CGN8-B - Startup Control

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M thermal Split

202004 19

Part 3

Control

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)W/D2N8-B compressor startup program

when ambient temperature is above 3°C

38rps

Target rotation speed

Compressor rotation speed (rps)

Time (s)

32rps

42rps

56rps

66rps

70rps

40s

60s

40s

120s

82rps

120s

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)W/D2N8-B compressor startup program

when ambient temperature is at or below 3°C