'10 • HM-T-149A
Installation
29
Indoor unit installation
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.
Deleted
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.
* water reserve: initial water volume in the expansion vessel
when the system is f illed with water
Initial pressure and max height difference
Recommended maximum height difference between expansion
vessel and the highest point in the system is 5m.
The initial 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. 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.
Consult local distributor in case the height difference exceeds
5m.
Manual shunting
When indoor unit is set to emergency mode on the main
switch SF1, the heating control system is not in operation, 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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