<HMS140V>
Emptying the vessel
The vessel in indoor unit is emptied by opening the valve
(QM1) and safety valve (FL2).
NOTE
When the vessel in indoor unit is emptied via the valve
(QM1), some water will remain in the coil and in the
heat exchanger.
This means that there is a risk of the heat exchanger,
pipes and valves f reezing at low temperatures as well
as a hygienic risk f or the coil in the hot water section.
Safety relief
valve position
5 m higher 0 m 5 m lower
system water
volume (
ℓ
)
540 470 360
Safety relief
valve position
5 m higher than
expansion vessel
0 m
5 m lower than
expansion vessel
system water
volume (
ℓ
)
390 330 240
Dimensioning expansion vessel
Internal volume in HMA100V and HMA100VM for calculating
expansion vessel is 280
ℓ
. The expansion vessel’s volume must
be at least 5 % of the total volume.
HMS140V has 18
ℓ
of expansion vessel. which can cover the
total system water volume mentioned in the below table.
Ifthesystemvolumeexceedsthelimit,extraexpansionvessel
is necessary. Install it in the same level and same pre-pressure
as the original one.
Alternatively,byreducingthewaterreserve*to1ltr,itispossible
to increase the system volume.
*waterreserve:initialwatervolumeintheexpansionvessel
when the system is f illed with water
Initial pressure and max height difference
The initial pressure of the pressure expansion vessel must be
dimensioned according to the maximum height (H) between
thevesselandthehighestpositioned radiator,seefigure.An
initial 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 User’s manual.
Any change in the initial pressure affects the ability of the
expansion vessel to handle the expansion of the water.
Manual shunting
When indoor unit is set to emergency mode on the main
switchSF1,theheatingcontrolsystemisnotinoperation,and
is why manual shunt operation is required.
1. Depress and lock the button on the valve.
2. Turn the mixing valve to the desired position by hand.
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