7.4 Maintenance of the On-Demand DHW block
The On-Demand DHW block is an assembly including the DHW flat-plate heat exchanger, the
bypass valve with actuator, the primary pump, the four water external connection ports, two
temperature sensors, the flow sensor, a boiler circuit drain port (not visible below--located behind
boiler inlet connector), and the strainer / flow restrictor.
Boiler circuit water pressure sensor
Bypass check valve
DHWoutlet temperature sensor
DHWflat-plate heat exchanger
Bypass valve actuator (partially obscured)
DCWinlet temperature sensor
Flow Sensor
Flow restrictor / water strainer
Auto air vent (keep cap open)
Boiler pump air purge valve (normally closed)
Figure 46 Combi block service points
Section: Service and maintenance
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