12
3.20 - Connecting
the supply,
return, gas, cold
water and hot
water
In its standard configuration, the
heater comes with the fittings
illustrated in figure 26.
More information about this matter
are in the next pages
3.21 - Safety relief
valve
An
ASME
approved safety relief
valve, set at
30 psi (2 bar)
, is
installed inside the heater.
If the safety relief valve discharges
periodically, this may be due to
thermal expansion in a closed
water supply system.
CAUTION!!! Do not plug
the safety relief valve.
There must be no valves
between the relief valve and
the heater. The relief valve
discharge pipe must not be
restricted or plugged.
Connect the safety relief valve
outlet “E” (see fig. 5) to pipe “F”, (a
3/4” discharge pipe).
If the safety relief valve “E” (see fig.
5) is not connected to the
discharge, opening of the valve may
result in damage to persons,
animals or property.
3 - INSTALLATION
Figure 4 - Hydraulic and gas connections
Figure 5 - Safety relief valve discharge
connection
A = domestic cold water
B = domestic hot water
C = gas
D = heating return
E = heating supply
F = Position of the raccords
