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1
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).
Remove the filling loop hose from valve A. Insert storage
9.
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.
PRIMARY CONNECTIONS
Filling Primary Circuit (Indirect)
1.
Remove the front cover (Section 3.4) and the insulation
(Section 3.12) to gain assess to the Primary return air vent.
2.
Turn the black handle on isolation valve D so it is pointing
upward, the water will now flow from the primary circuit into
the primary PHE circuits on both PHE.
With a suitable hose and container fitted to the Primary Air
3.
Vent (front of tee), open vent screw to allow air to exit. As
soon as air free water flow is detected close the vent.
Note: The water in the primary circuit will be hot so caution
must be taken to prevent splashes when venting.
4.
Open Primary return isolation valve C by rotating handle
upward.
5.
Turn on electrical supply to the HIU.
6.
The 2 PICV on the primary circuit will open and close whilst
they carry out an initial calibration cycle, this will allow
additional water to be released into the PHEs.
7.
Repeat items 2 to 4 to bleed remaining air.
Note: If the unit has not been initially powered up, then
valves C and D should be moved to the close position to
prevent primary flow. After the initial power up the PICVs
will have carried out their calibration and be in the closed
position.
18
SECTION 2 - INSTALLATION
2
3
0
4
bar
Filling Primary Circuit (Direct)
1.
Remove front cover (section 3.4) and the insulation (section
3.12) to gain access to the Primary and CH Air Vents.
2.
Ensure isolation valves C, D, E and F are in closed position
(handle horizontal).
3.
Turn the black handle on isolation valve D so it is pointing
upwards, the water will now flow from the primary circuit
into the primary PHE circuit and the CH flow pipe.
With a suitable hose and container fitted to the Primary and
4.
CH air vents, open vent screw and allow air the exit. As
soon as air free water flow is detected close the vent.
Note: The water in the primary circuit will be hot so
caution must be taken to prevent splashes when venting.
Open the Primary return valve C, CH flow valve E and
5.
CH return valve F by rotating the handle into the vertical
position. This will cause the CH circuit external to the
appliance to be filled and pressurised. Additional venting
and commissioning should be undertaken as required by
the system designer.
6.
Turn on the electrical supply to the HIU.
The 2 PICV's on the primary circuit will open and close
7.
whilst they carry out an initial calibration cycle, this will
allow additional water to be released into the PHE's.
8.
Repeat items 3 - 5 to bleed remaining air.
Note: If the unit has not been initially powered up, then
valves C and D should be moved to the close position to
prevent primary flow. After the initial power up the PICVs
will have carried out their calibration and be in the closed
position.
Initial commissioning
1.
Ensure all isolation valves are in the "run" position.
Locate the 2 x pressure test points (primary flow Red &
2.
primary return Blue) positioned on the primary flow and
primary return manifolds. Unscrew the caps as required.
3.
Connect a suitable high-water pressure measuring device
to the appropriate pressure connections.
4.
Set the instrument up to measure differential pressure and
the units kPa.
5.
Activate a kitchen or bath tap and ensure the pressure
differential reading is no lower than 50 kPa.
6.
Turn tap off.
7.
Activate the central heating and take the pressure
differential reading. Ensure the reading lies within
manufactures requirements.
Note: Primary pressure drops below the nominal 50kpa will
slightly reduce the output of the product.
Isolation Valve Configuration
Filling
Loop
A
B
Note: Tap 'E' is the main CH connection tap. Tap 'F' is the
filling loop tap.
C
D
E/G
F
Installation and Servicing
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