Dip Switch Settings; Internal Circulation Pump - Midea M thermal Mono Series Engineering Data

M thermal Mono

5 DIP Switch Settings

DIP switches S1 and S2 on the hydronic system main PCB should be used to specify refrigerant piping length and to specify
whether certain components have or have not been installed. Refer to Table 3-5.1 and to the M thermal Mono Service
Manual, Part 4, 2.2 "Main PCB for Hydronic System".
Switch
S1
S2
S4

6 Internal Circulation Pump

The pump is controlled via a digital low-voltage pulse-width modulation signal which means that the speed of rotation
depends on the input signal. The speed changes as a function of the input profile. The relationship between external static
pressure and water flow rate is described in Part 2, 7 "Hydronic Performance".
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Table 3-5.1: DIP switch settings
ON=1
1 Reserved
2 Reserved
00=Without IBH and AHS
10=With IBH
3/4 01=With AHS for heating mode
11=With AHS for heating mode
heating and DHW
Start pumpo after
1 six hours will
be invalid
2 without TBH
00=variable speed pump
(Max head:8.5m,Grundfos)
01=constant speed pump
(WILO)
3/4
10= variable speed pump
(Max head:10.5m,Grundfos)
11=variable speed pump
(Max head:9.0m, WILO)
1 Reserved
2 Reserved
3/4 Reserved
Figure 3-6.1: Internal circulation pump
Midea CAC Confidential
OFF=0 Default factory setting
Reserved
Reserved
Start pumpo after
six hours will
be valid
with TBH
Reserved
Reserved
OFF
OFF
OFF/OFF
OFF
OFF
ON/ON
OFF
OFF
OFF/OFF
202005