Controls Facia Panel Removal; Expansion Vessel Pressure - IDEAL istor HE260 Installation And Servicing

54 CONTROLS FACIA PANEL REMOVAL

Refer to Frame 51.
1. Ensure the power supply is turned off.
2. Disconnect the 14 way in-line molex connector.
3. Remove the 2 M5 screws securing the panel.
4. Lift off the panel from its locating slots.
5. Disconnect the DHW thermistor at the in-line
connector.
6. Remove the panel and store carefully to one
side.

55 EXPANSION VESSEL PRESSURE

prog
istor system store -
Installation and Servicing
Remove cap
1
2
time
select P R O G R A M M E R + -
Remove cap
ist9842
SERVICING
ist9835
Check the pre-charge pressures on both
expansion vessels and top up if necessary.
Pre-charge Pressure
1
2
Note.
Before checking the Pre charge pressure of
expansion vessels:
CH - System pressure must be dropped to zero.
DHW - Close cold inlet isolating valve and open
a hot tap to drop DHW cylinder pressure to zero.
DHW 1.5 - 2.5 bar
CH 1 - 1.5 bar
45