6
User Instructions
3 CH SYSTEM WATER PRESSURE (INDIRECT MODELS ONY)
The system pressure gauge (see page 4) indicates the central
heating system pressure. If the pressure is seen to fall below
the original installation pressure of 1-2 bar over a period of time
and continues to fall then a water leak may be indicated. In this
event re-pressurise the system as shown below. If unable to do
so or if the pressure continues to drop an Approved Engineer
should be consulted.
THE HIU WILL NOT PROVIDE CH IF THE PRESSURE
HAS REDUCED TO LESS THAN 0.3 BAR UNDER THIS
CONDITION.
Filling CH / Topping up (Indirect Ony)
1.
Ensure isolation valves A, E and F are in the “run” position
(handle vertical) and isolation valve G is in the “off” position
(handle opposing body).
2.
Remove the dust cap from valve A and plug from the filling
loop adjacent to valve A.
3.
Ensure top hat washers is still fitted to the valve A (if not
then check inside the removed dust cap).
4.
Connect the filling loop to valve A.
Note: Heat Interface Unit not shown for clarity
5.
Turn isolation valve A to the “fill” position (handle
horizontal).
6.
Turn valve G to the “fill” position (handle in line with valve
body). The CH circuit will begin to fill.
7.
Monitor the pressure gauge until the correct pressure is
achieved (max 2.75 Bar, recommended 1 – 1.5 bar for
normal operation) then turn isolation valve G to the “off”
position (handle opposing valve body) to isolate the charge
supply.
Note:
If refilling the unit or system rather than topping
up, air may require manual venting from the CH circuit by
a certified agent. Refer to the installation and servicing
instructions for more information.
8.
Turn isolation valve A to the “run” position (handle vertical).
9.
Remove the filling loop hose from valve A. Insert storage
plug into left side of filling loop hose.
Note: A small volume of water may remain within the hose.
10.
Ensure top hat washer is still attached to isolation valve A.
11.
Screw the dust cap to the front of isolation valve A.
A
G
F
E
A
B
C
D
E
G
F
A
E
G
F
Filling Loop Hose
1
0
2
3
4
bar
