Initial pressure and max height difference
The pre-pressure of the pressure expansion vessel must
be dimensioned according to the maximum height (H)
between the vessel and the highest positioned radiator,
see figure. A pre-pressure of 0.5 bar (5 mvp) means a
maximum permitted height difference of 5 m.
If the standard initial pressure in the pressure vessel is not
high enough it can be increased by filling via the valve in
the expansion vessel. The expansion vessel's standard initial
pressure must be entered in the check list on page 42.
Any change in the initial pressure affects the ability of the
expansion vessel to handle the expansion of the water.
Manual shunting
When HM 8-12 SPLIT is set to emergency mode, the heat-
ing control system is not in operation, and manual shunt
operation is required.
1.
Press and lock the button on (QN11).
2.
Turn the mixing valve to the desired position by hand.
Emptying the vessel
The vessel in EHZK 90 SPLIT, WWS 300 SPLIT, WWS 500
SPLIT is emptied by opening the valve (QM1) and safety
valve (FL2).
NOTE
When WWS 300 SPLIT/WWS 500 SPLIT is emptied
via the valve (QM1), some water will remain in the
coil and in HM 8-12 SPLIT.
This means that there is a risk of the heat exchanger,
pipes and valves freezing at low temperatures as well
as a hygienic risk for the coil in the hot water section.
EHZK 90 SPLIT
Recommended installation order
1.
Connect HM 8-12 SPLIT to the climate system and to
the tank. Connect cold and hot water lines as well as
any external heat sources to the tank. See page 24.
Also see docking descriptions on page 29 and further
on.
2.
Install the refrigerant pipes according to the descrip-
tion on page 25.
3.
Connect the load monitor, outdoor temperature
sensor, any centralised load control and external con-
tacts as well as the cable between HM 8-12 SPLIT, the
water heater and L8 SPLIT/L12 SPLIT. See page 35.
4.
Connect supply to HM 8-12 SPLIT. See page 33.
5.
Follow the commissioning instructions on page 40.
21SPLIT
For the Installer
General information for the installer
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