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9.14
BOILEr PrESSurE AND rETurN TEMPErATurE SENSOr
As the original DHW Flow Rate and Temperature Sensor – section 9.13
9.15
PuMP
For access refer to Section 9.1 General and for draining procedures Section 9.5 Heat
Exchanger. After ensuring the appliance is drained down remove the electrical plug
by squeezing the clip on the back of the plug and pulling out to the left.
Disconnect the pump head by unscrewing the 4 retaining bolts using a 4mm allen
key and pulling forwards.
9.16
SAFETY rELIEF vALvE
For access refer to Section 9.1 General and for draining procedures Section 9.5
Heat Exchanger. After ensuring the appliance is drained down loosen the 15mm
compression joint connecting the discharge pipe to the outlet elbow connected to
the valve using a 4mm AF spanner.
Then release the spring clip retaining the valve on the hydraulic monoblock by pulling
to the right and then lift out the valve and elbow.
NOTE: Disconnect the male iron/copper outlet elbow from the old valve and re-use
on the new one.
9.17
PLATE HEAT EXcHANGEr
For access refer to Section 9.1 General and for draining procedures Section 9.5 Heat
Exchanger. Also isolate and drain down as necessary the hot and cold water domestic
system.
After ensuring the appliance and the water systems are drained down release the
retaining bolts holding the PHE in position using a 4mm allen key. Using both hands
over the top of the hydraulic monoblock pull the PHE backwards and then up and
over the top of the hydraulic monoblock, after having unscrewed the cap on the
automatic air vent to allow the necessary clearance. There are 4 washers to seal the PHE
connections which will be retained in each of the hydraulic monoblock connections.
These will need to be replaced. These can easily be removed by pushing forward your
finger into the centre of the washer and then pulling it backwards.
Plate heat exchanger
Release bolt
Release bolt
Page 39
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