9 Piping work and
refrigerant charge
TCGB0070 rev.3 - 04/2012
122
9.6.3
Draining pipe work
Connect the drain pipe coming from the safety valve (located with the water IN/OUT pipes) to the general draining system.
N O T E
The safety valve will be activated when water pressure reaches 3 bars.
•
Two draining ports are provided with the factory supplied shutdown valves, and a draining cap on the expansion ves-
sel to drain the water from the indoor unit in case of servicing. In that situation, connect the appropriate drain pipe in
order to avoid any water coming into contact with electrical parts.
•
If there is a cooling installation, a drain pipe must be installed (refer to
Unit Installation
chapter). The drain pipe on
the drain pan must be connected to the general Draining System (following assembly instruction included with acces-
sory). The Drain Pipe size is ø25mm (outer dimension).
C A U T I O N
Drain taps must be provided at all low points of the installation to permit complete drainage of the circuit during
servicing.
Do not drain the water circuit when the system is operating. There will be a blast of water which will cause da
-
mage.
9.6.4
Circuit water filling-in
• The Installation will be filled in through a shutdown valve (field supplied) which must be connected to the water circuit
between the indoor unit and the heating circuit.
• It is necessary to install a Check Valve (non-return valve) at the water filling in point. The Check Valve acts as a safe
-
ty device to protect the installation against back pressure, back flow and back syphonage of non-potable water into
drinking water supply net. The Check Valve should be field supplied.
•
Charge the water circuit until reaching a water pressure of 1.7~2.0 bar (1.8 bar recommended).
• Fill in the circuit with water (from the drinking water supply net). The heating installation water must comply with EN
directive 98/83 EC. Non-sanitary controlled water is not recommended (for example, water from wells, rivers, lakes,
etc.).
C A U T I O N
The maximum water pressure is 3 bar (Safety Valve nominal opening pressure).
Make sure that all field supplied components installed in the piping circuit can withstand the water pressure.
The unit is only to be used in a closed water circuit.
An automatic air vent is provided inside the indoor unit. Additional air vents will be provided at all high points of
the circuit. The air vents should be located at points which are easily accessible for servicing. Check that the air
vent is not tightened too much so that automatic release of air in the water circuit remains possible.
The internal Air Pressure of the Expansion Vessel tank will be addapted to the water Volume of the final installa
-
tion (factory supplied with 1 bar. of internal Air Pressure).
9.6.5
Water flow adjustment
In every installation the Circuit’s water flow must be adjusted according to its particular internal Pressure Lost. In addition to
this, the circuit should be set according to Heating circuit (Heating Floor, Radiators, Fan Coils) and its corresponding water
outlet temperature. The procedure for adjusting the water flow is described below:
•
1st., measurement of Pressure Lost
• 2nd., check the Pump Performance Curves
•
3rd., selection of the Pump Speed
• 4th., adjustment of the water flow
