Operation manual of solar controller SR658
Page 40 of 105
Diagram of back-up boiler connection (BOILE)
ON/OFF signal AC100-220V
（
customized available
）
If boiler is selected as back-up heat producer, output HK and HR is controlled by T3 or
T2(Optional). When T3 or T2(Optional) is reached to the switch-on temperature of back-up
heating function, then back-up heating output HK and HR are triggered, when T3 or
T2(Optional) is exceeded the switch-off temperature of back-up heating function, then
back-up heating output HK and HR are closed.
Note:
if electrical heater is selected as back-up heat producer, then according to the
power heater, an appropriate AC contactor and safety protection device should be installed,
we recommend to install the
accessory “SR802” (see accessories in paragraph 11)
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