Caution Make sure that check valves are installed on main supply line to pre-
vent risk of back flow from contaminating the water.
5.2 Safety valves
Warning Radiator systems with a closed expansion tank must also be equipped
with an approved manometer and safety valve, minimum DN 20, 1.5
bar opening pressure, or according to country specific requirements.
Warning Cold and hot water pipes and overflow pipes from safety valves must
be made of heat resistant and corrosion-resistant material, e.g. copper.
The safety valve overflow pipes must have an open connection to the
drain and visibly flow into this in a frost-free environment.
Warning The connecting pipe between the expansion tank and the safety valve
must slope continuously upwards. A continuous upwards slope means
that the pipe must not slope downwards from the horizontal at any
point.
5.3 Connection heating and hot water
5.3.1 Connect the heating system supply and return lines from indoor unit to outdoor unit
For information on how flexible hoses should be installed, see Flexible hoses.
1. Connect the supply pipe with a flexible hose connection and with all the necessary components.
2. Connect the return pipe with a flexible hose connection and with all the necessary components including a filter.
3. Insulate the supply and return lines.
4. Connect the bleed valve to the outlet (22mm) on the top of the hot water tank.
5.4
Piping work
The unit is only to be used in a closed water system. If applications are
in open water circuit, it will generate heat exchanger's fouling, corro-
sion, leak.
Caution Be careful not to deform the unit piping by using excessive force when
connecting the piping.
Installation Guide iTec XT
AWIXT01IG0102 Thermia AB
40
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