47
35
Note: It is likely that ther
e will still be some water
spillage when the head is removed.
f)
Remove the clip holding the r
eturn pipe in place.
g)
Undo the nut connecting the CH r
eturn pipe to the CH return
isolating cock, and disengage the CH return pipe from the
hydroblock.
h)
Unscr
ew the three screws holding the hydroblock onto the
mounting studs, and remove the hydroblock.
i)
Align the r
eplacement hydroblock against the mounting studs and
secure using the three screws.
j)
Re-assemble in r
everse order; ensure that all joints and seals are
correctly re-fitted.
k)
Open the isolating cocks and vent air fr
om the system using the
manual air vent. Re-pressurise the system as necessary and check for
water leaks.
f)
Re-assemble in r
everse order; ensure that all joints and seals are
correctly re-fitted.
g)
Open the isolating cocks and vent air fr
om the system using the
manual air vent. Re-pressurise the system as necessary and check for
water leaks.
8
Note: It is likely that ther
e will still be some water spillage when the Hydroblock is removed.
a)
Ensur
e supply voltage is isolated.
b)
Drain down the appliance; r
efer to section 9.19.
c)
Undo the nut holding the manual air vent to the expansion vessel
and disengage the link pipe from the heat exchanger by removing
the clip and pulling upwards through the grommet at the top or by
rotating out of the way.
d)
Remove the upper expansion vessel r
etaining bracket.
e)
Slide the expansion vessel for
ward and remove.
f)
Slide the r
eplacement expansion vessel in place.
g)
Re-assemble in r
everse order; ensure that all joints and seals are
correctly re-fitted.
h)
Open the isolating cocks and vent air fr
om the system using the
manual air vent. Re-pressurise the system as necessary and check for
water leaks.
9.11
EXPANSION VESSEL
Refer to Figur
e 48
a)
Ensur
e supply voltage is isolated.
b)
Disconnect the electrical leads to the pump head.
c)
Drain down the appliance; r
efer to section 9.19.
d)
Remove the flow and r
eturn pipes from the heat exchanger; refer
to section 9.8.
e)
Remove the clip holding the hydr
oblock adaptor fitting in place,
and remove fitting.
9.10
HYDROBLOCK ASSEMBLY
48