Unplug the connector at the diverter valve.
Using a pair of long nose pliers, remove the two clips securing
the 6 mm copper pressure pipe, to the top left hand corner of the
valve and pump connection. Retain the clips. Ease the pressure
pipe out of the connections and clear of the appliance.
Retain the pressure pipe.
Unscrew the four fixing screws securing the water diverter valve
to the bottom manifold. The bottom right hand screw is
accessible using a “chubby” type screwdriver. Remove the water
diverter valve clear of the appliance. Discard the valve and “O”
ring seals. Retain the fixing screws.
CAUTION.
There will be a small quantity of water remaining in
the valve and lower manifold. Follow the procedure as described
in Section 15.2.
NOTE:
Three new “O” ring seals are provided with the
replacement valve. Two of the “O” rings are identical in diameter
and cross - section and are required for the outer ports. The third
“O” ring is smaller in diameter and cross-section and will seal the
centre port.
IMPORTANT:
Fit the two larger diameter “O” rings into the outer
locations on the replacement valve. Fit the smaller diameter “O”
ring over the centre spigot on the bottom manifold. Ensure the
“O” ring is located correctly against the shoulder on the centre
spigot.
Fit the replacement valve in reverse order ensure the four fixing
screws are correctly engaged. Replace the “O” ring seals and refit
the pressure pipe. Ensure the securing clips are fully engaged in
the locating holes.
Reconnect the electric cable to the control board and replace the
strain relief bush. Replace the circulating pump as described in
Section 15.3-20.
Open the valves, fill and repressurise the system as described in
Section 12.2. Reassemble the appliance in the reverse order.
22. Water to Water Heat Exchanger.
See Figs. 34, 35, and 36.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel, place the facia and control
box in the Service Position and lower the expansion vessel
into the Service Position, as described in Section 14.2 a, b and c.
Drain the heating and hot water circuit as described in
Section 15.2
CAUTION:
The weight of the water to water heat exchanger is
2 kg. approx. A quantity of water will remain in the heat
exchanger and pipework. Follow the procedure as described
in Section 15.2.
Remove the circulating pump as described in Section 15.3 - 18.
Remove the water diverter valve as described in Section 15.3 - 19.
Note:
(
i) It is not necessary to disconnect the electrical cable
from these components. The length of cable is sufficient
to allow them to rest on top of the appliance cabinet.
Do not allow them to be suspended by the cable. Secure
the pump head and diverter valve.
(
ii) Unless otherwise stated all water joints are sealed with
“O” rings. To disconnect twist the pipe and/or ease the
joint apart. When re-connecting the joint a new “O” ring
must be fitted. Silicone grease must be applied to the
“O” ring.
Remove the pressure relief valve and manual air vent as
described in Section 15.3- 25, 26 and retain.
Unscrew locating screw No.1 in the bottom manifold two full
turns.
Unscrew the flat faced union fitting below the flow turbine
and remove the sealing washer and discard. Move the cold
water inlet pipe to the left to clear the flow turbine. Ease the
pipe upwards, 10mm approx. and remove from the bottom
manifold. Retain the pipe.
Fig. 33. Water diverter valve.
Copper pressure pipe
Securing clip for copper
pressure pipe
Replace the “O” ring seals (2) on
the copper pressure pipe located
either end of the pipe
Unscrew the four fixing screws
securing the valve head to the
bottom manifold
Bottom right-hand fixing screw
accessible using a “chubby” type
screwdriver
VIEW ON FRONT OF WATER
DIVERTER VALVE
VIEW ON REAR OF WATER
DIVERTER VALVE
Fit new “O” ring seals in the outer
locations on the rear of the diverter
valve. The “O” ring seals are
identical for the outer connections
Before reassembly ensure the
“O” ring seals are in place with
the smaller diameter “O” ring seal
located on the centre spigot of
the bottom manifold
Ensure the “O” ring seal is removed
from the bottom manifold spigot
WARNING:
There will be a small
quantity of water remaining in the
water diverter valve and pipework
When replacing the “O” ring seal to
the centre spigot ensure it is the
correct diameter and cross section.
Locate the “O” ring onto the shoulder
formed on the centre spigot
Bottom manifold
Fixing holes (4)
27
Summary of Contents for Highflow 400 BF
Page 43: ...43 ...
