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".
Table 3-5.1: DIP switch settings
Switch
Description
ON
OFF
Default factory
setting
S1
1
Selection of refrigerant pipe length
/
5m
OFF
2
Backup electric heater outlet temperature sensor
Installed
Not installed
OFF
3
The first backup electric heater element
Not installed
Not Installed
OFF
4
The second backup electric heater element
Not installed
Not Installed
ON
S2
1
Additional heating source outlet temperature sensor
Installed
Not installed
OFF
2
Reserved
3
4
6
Internal Circulator Pump Speed Settings
The internal circulator pump speed can be selected by adjusting the red knob on the pump. The default factory setting is
the highest speed (III). If the system water flow is too high, the pump speed can be set to medium (II) or low (I). The
relationship between external static pressure and water flow rate is described in Part 2, 11 “Hydronic Performance”.
Figure 3-6.1: Internal circulator pump
The pump has an LED operating status display. This makes it easy for the technical engineer to search for the cause of a
fault in the system.
If the LED display lights up continuously green, it means the pump is running normally.
If the LED display is flashing green, it means the pump is running the venting function. The pump runs during the 10
minute venting function. After its cycle, the installer needs to adjust the targeted performance.
If the LED is flashing green/red, it means that the pump has stopped operating due to an external reason. The pump
will restart by itself after the abnormal situation disappears. One of the reason is pump undervoltage or overvoltage
(V<160V or V>280V), please check the power supply and solve the problem. The other reason is module overheating,
and you should check the water and ambient temperatures.
If the LED is flashing red, it means the pump has stopped operating, and a serious fault has happened (e.g. pump
blocked). The pump cannot restart itself due to a permanent failure and the pump should be changed.
If the LED does not light up, it means no power supply to the pump, possibly the pump is not connected to power
supply. Check the cable connection. If the pump runs but LED not light up, it means the LED is damaged. Or the
electronics are damaged and the pump should be changed.
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