Ravenheat CSI85A, Installation And Servicing Instructions

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7.33 TO REMOVE / REPLACE D.H.W. HEAT
EXCHANGER
7.33.1 Remove the front panel from the outer casing
and lower the instrument panel (sect. 7.16.2 & 3)
7.33.2 Close the on/off valves for the heating circuit
and the hot water circuit. Drain the boiler (Fig.
93) and drain hot water from the lowest hot
water tap and drain point on DHW inlet cock
(Fig. 46).
7.33.4 Unscrew the four nuts that connect the DHW
heat exchanger and pull it out from boiler
7.33.5 If necessary the pipes from the diverter valve
may have to be remove for easier access.
7.33.6 Repleace in reverse order Always use new
seals.
7.33.7 Fill the boilers as described in (sect. 6.4 & 5)
and check for leaks.