CAUTION
Do not connect the domestic hot water connection directly
to copper pipes in order to prevent galvanic couples in iron/
copper (risk of corrosion). It is compulsory to fit the
domestic hot water connection with a dielectric
connection (Supplied).
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Safety valve or safety unit
CAUTION
In accordance with safety rules, a safety unit calibrated to
7 bar must be mounted on the DHW tank’s domestic cold
water inlet.
7 bar safety valve (0.7 MPa).
4
Integrate the safety valve in the cold water circuit.
4
Install the safety valve close to the calorifer in a place which is
easy to access.
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Size
4
The diameter of the safety unit and its connection to the DHW tank
must be at least equal to the diameter of the DHW tank’s domestic
cold water inlet.
4
No isolating devices must be fitted between the valve or the safety
unit and the DHW tank.
4
The outlet pipe in the valve or safety assembly must not be
blocked.
To avoid restricting the flow of water in the event of overpressure:
4
The safety device drain pipe must have a uniform and sufficient
gradient and its diameter must be at least equal to that of the outlet
opening of the safety device (to prevent the flow of water being
hindered if the pressure is too high).
4
The cross section of the discharge pipe from the safety unit must
be at least equal to the cross section of the opening of the safety
unit outlet.
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Isolating valves
Hydraulically isolate the primary and secondary circuits using stop
valves to facilitate maintenance operations on the unit. The valves
make it possible to carry out maintenance on the calorifer and its
components without draining the entire installation.
These valves are also used to isolate the calorifer unit when
conducting a pressurised check on the leak tightness of the
installation if the test pressure is greater than the admissible operating
pressure.
5. Installation
TWH 200E TWH 300E TWH 300EH
30
19/01/2015 - 300026515-001-05
