Baxi Lite Compact LC550 Installation And Service Manual page 36

3.4.2 Connecting the domestic hot water circuit
The dielectric unions are provided in the documentation bag.
1. A dielectric union must be connected using hemp fiber or pipe joint compound,
between the water outlet/inlet of the domestic hot water tank and the pipework to
avoid any corrosion at the union.
2. Mount a domestic water thermostatic mixing valve (not provided) on the domestic hot
water tank outlet
For Italy, the thermostatic mixer valve is recommended.
3.4.3 Connecting the domestic hot water circuit
1. Install a pressure reducer if the mains pressure exceeds 80% of the calibration of
the safety valve or unit (e.g. 0.6M Pa / 6 bar) for a safety unit calibrated to 0.8 MPa
/ 8 bar).
Caution
Install the pressure reducer upstream of the appliance and downstream of the water
meter in such a way as to ensure the same pressure in all the system's pipes.
2. Install a water drain in the boiler room and a funnel-siphon for the safety unit.
3. Incorporate a sealed safety valve calibrated to 0.8 MPa (8 bar) on the domestic cold-
water inlet, close to the tank, in a position which is easy to reach, to protect the
domestic hot water tank from pressure surges.
Caution
There must be no cut-off devices between the safety valve or unit and the domestic hot
water tank.
4. To avoid restricting the flow of water in the event of overpressure: the safety unit
discharge pipe must be kept in the open, in a frost-free environment, and have a
continuous, downward gradient; the diameter of the safety unit and its connection to
the tank must be at least equal to the diameter of the domestic cold-water inlet on
the tank.
5. Make the connection to the domestic cold water.
3.4.4 Fill the domestic hot water tank.
When the water and electrical connections are made, fill the domestic hot water tank.
Turn on a hot water tap.
5.
Open the cold-water tap located on the safety unit to vent the air in the
6.
installation.
Close the hot water tap when water starts to flow from the tap. The domestic
7.
hot water tank is full.
Check the tightness of the pipe connections and the correct operation of
8.
the hydraulic devices by successively opening the drain valve on the safety
unit.
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