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9.18
HYDrAuLIc MONOBLOcK
If it should ever prove necessary the whole of the hydraulic monoblock can be
removed and replaced. For access refer to Section 9.1 General and for draining
down procedures Section 9.5 Heat Exchanger. Also isolate and drain down as
necessary the hot and cold water domestic systems.
Release/pull off all the electrical and mechanical connections to the hydraulic
monoblock within the compartment by following the instructions elsewhere
in this section for each of the components/connections. Release also the
4 no pipework connections from the base of the hydraulic monoblock by
releasing the spring clips. Release the hydraulic monoblock from the base
of the compartment by unscrewing the 4 retaining screws using a pozi type
screwdriver and releasing the securing clips by turning anti clockwise with
a 6mm allen key. Pull up and forward to remove the hydraulic monoblock
from the compartment.
9.19
DrAIN OFF TAP
For access refer to Section 9.1 General and for draining procedures Section
9.5 Heat Exchanger. After ensuring the appliance is drained down, release the
spring clip retaining the tap by pulling to the right and pull out (forward) the
drain off tap.
9.20
DIvErTOr vALvE HEAD
For access refer to Section 9.1 General and for draining procedures Section 9.5
Heat Exchanger. After ensuring the appliance is drained down, push down the
retaining clip on the front of the electrical plug and pull to the left to remove.
Remove the actuator by moving the front of the head 45º to the right and then
pulling up and out of the valve.
9.21
AuTOMATIc AIr vENT (TO HYDrAuLIc MONOBLOcK)
For access refer to Section 9.1 General and for draining procedures Section 9.5
Heat Exchanger. After ensuring the appliance is drained down turn the whole
of the automatic air vent anti clockwise through 45-55º to release then pull
up and remove.
Diverter valve head
9.22
cENTrAL HEATING cLOcK
For access refer to Section 9.1 General. Remove the
clear plastic cover and release the two holding screws
located in the top left and bottom right hand corners
by turning anti clockwise ¼ turn. Pull out the clock
from the panel and remove the 4 spade connectors
at the base of the clock having first made a note of
their positions.
9.23
ON-OFF SWITcH
For access refer to Section 9.1 General. Remove the
clear plastic cover from the inside of the electrical/
lower fascia panel by removing the 4 retaining screws
using a pozi type screwdriver. Remove the spade
connectors from the rear of the switch, squeeze in
the holding tabs on each end of the switch and push
through the panel.
Auto air vent
Drain tap
Page 40
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