Sinclair SCV-EB Series Service Manual page 23

6.5 Balance tank temperature control
Balance tank temperature sensor is used to control on/off of heat pump. Once the heat pump stops, internal pump stops
to save energy and then balance tank provides hot water for space heating. In addition, balance tank temperature control
can meet both space heating and domestic hot water needs at the same time. Balance tank can store energy to provide
hot water whilst heat pump runs heat mode/cooling, which can reduce the host selection and the initial investment.
6.6 Dry contract M1M2 control
M1M2 can be set in the wired controller for heat pump on/off control, AHS control.
 For heat pump on/off control
When dry contract closes for 1s, heat pump stops. When dry contract opens for 5s, heat pump on/off according to wired
controller or room thermostat setting.
 For AHS control
In heating mode， AHS on/off is only controlled by M1M2.
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