Back boiler tripping immersion safety cut-out


Postby Skids » Tue Aug 05, 2008 3:59 pm

Back boiler tripping immersion safety cut-out

Hi all,

Problem: ‘back-boiler’ heats HWC to above 95°c, which trips the immersion heater safety cut out.

Solution: fit thermostat the HWC/primary flow, so that when temperature reaches (say) 75°c, thermostat tells the CH pump to ‘turn on’ and divert the hot water from the HWC to CH.

Question: how to wire the thermostat, with a permanent live connection so that in the event of a overheat situation, the pump is activated, irrespective of whether it is turned on at the ‘double- pole switch’, thus dissipating excess heat quickly through the radiator circuit and prevent boiling the WHC.

There are three terminals on the thermostat wiring:

1. Common inlet.
2. Outlet (opens the circuit with increasing temperature).
3. Outlet (closes the circuit with increasing temperature).

Where does wire 1 connect to? (on the double- pole switch)
Where does wire 2 connect to? (on the double- pole switch)
Where does wire 3 connect to? (on the double- pole switch)

So the question is: where do all the wires need to come from and go to?

Before you ask, there is no heat sink rad.

Regards

Skids
Skids
Posts: 128
Joined: Fri Dec 21, 2007 6:35 pm

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