Mitsubishi HMA100V Technical Manual page 303

Start-up and inspection
Preparations
Connect outdoor and indoor unit (refrigerant pipe and wiring)
and connect indoor unit to the climate system.
Filling the climate system
1. Ensure that the pressure gauge (BP5) is visible.
2. Ensure the valve to expansion vessel is closed (HMS140V only).
3. Connect a hose to the filling valve (QM1) and open the
valve to fill the system.
4. After a while the pressure gauge (BP5) will show rising
pressure.
5. When the pressure has reached about 2.5 bar a mix of air
and water starts to emerge from the safety valve (FL2).
Close the filling valve (QM1).
6. Open the valve to expansion vessel when air vent is
completed (HMS140V only).
<HMA100V, HMA100VM>
BP5
<HMS140V>
HT30
FL2
QM20
QM1
QM1
MT300
MT500
Venting the climate system
1. Vent indoor unit through the safety valve (FL2) and the rest
of the heating system through the relevant venting valves.
2 . Open the valve to expansion vessel when air vent is
completed. (HMS140V only)
3. After opening the valve, vent indoor unit through venting
valve on indoor unit to bleed rest of air ompletely.
(HMS140V only)
Keep topping up and venting until all air has been removed and
the correct pressure has been obtained.
Valve to
expansion vessel
Air vent valve
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'10 • HM-T-149A
Installation
Start-up and inspection
FL2
BP5
QM1
QM20
BP5
FL2
QM1
75