Baxi UBVT 200 DC Installation, User And Service Manual page 25

UBVT 200...400 SC UBVT 200...500 DC
12/02/2013 - 300027525-001-02
Germany: Define the dimensions of the safety valve in accordance
with the DIN 1988 standard.
Calorifer capacity Minimum inlet connection size
(litres) of the safety valve
< 200
200 to 1000
4 Fit the safety valve above the calorifer to avoid draining the tank
during servicing.
4 Install a drainage valve at the lowest point on the calorifer.
n 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.
CAUTION
If the mains pipes are made of copper, fit a sleeve made
of steel, cast iron or any other insulating material between
the tank's hot water outlet and the pipes to prevent
corrosion to the connection.
n Connecting the domestic cold water
Make the connection to the cold water supply according to the
hydraulic installation diagram.
The components used for the connection to the cold water supply
must comply with the prevailing standards and regulations in the
country concerned.
4 Install a water drain in the boiler room and a funnel-siphon for the
safety unit.
4 Fit a one-way valve to the domestic cold water circuit.
n Pressure reducer
If the mains pressure exceeds 80% of the calibration of the valve or
safety unit (e.g. 5.5 bar (0.55 MPa) for a safety unit calibrated to 7 bar
(0.7 MPa)), a pressure reducer must be installed upstream of the
appliance. Install the pressure reducer downstream the water meter
in such a way as to ensure the same pressure in all of the installation
pipes.
Heating output
(kW) (max)
R or Rp 1/2
R or Rp 3/4
4. Installation
75
150
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