Pressure Sensor/Pressure Relief Valve - Potterton Powermax HE 85 Litre Installation And Servicing Instructions

Isolating Valve
Gas Cock
PO WE
-
R
+
CH
MA INS H.W .
BU RN TEM P
ON ER
LO CK
OU T HW
RE SET
SEL
C.H . +
AD VAN
CE SEL
PR OG
-
PRO
G
Fig. 19
30
Replacement of Parts
Isolating
Valve
Open
Auto
Air
Vent
Cap
Open
Pump
Closed
Isolating
Valve
Expansion
Vessel
Remove Primary
Pressure Sensor
'O' Ring
Pull out Clip to
By-pass
release Pressure
Valve
Relief Valve
Remove Cross/Pressure
Relief Valve Assembly
(By-pass Valve part of assy.)
4.4
Re-assemble all parts in reverse order.
1. Perform 4.1 General Access.
2. Isolate three valves as shown and open
the cap on the auto air vent.
3. Release pressure by opening the
pressure relief valve.
4. Primary Pressure Sensor
Disconnect the electrical connector and
unscrew the sensor.
4. Pressure Relief Valve (PRV)
Release union nut below the sensor body,
remove securing clip and pull valve out
from assembly.
4. By-pass Valve
This valve is part of the complete 'cross'
Pressure
unit and cannot be replaced separately.
Relief Valve
Remove the pressure relief valve as
shown above then release the unions and
remove the 'cross' unit.
Open
Pressure
Relief Valve
Disconnect
Electrical
Connector
Pressure
Relief Valve
Pressure Sensor/PRV
Publication No. 5106226