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2 For the User
Safety valve
The hot water coil's externally mounted safety valve
sometimes releases a little water after hot water usage.
This is because the cold water, which enters the hot
water coil, expands when heated causing the pressure
to rise and the safety valve to open.
The function of the safety valve must be checked regu-
larly. Perform checks as follows:
Open the valve.
1.
Check that water flows through the valve.
2.
Close the valve.
3.
TIP
The safety valve is not supplied with the accu-
mulator tank. Contact your installer if you are
unsure how one checks the valve.
Emptying
COIL
1.
Shut off the incoming cold water.
2.
Open the drain connection, or the drain valve if one
is fitted, on the cold water connection (XL3).
NOTE
Water may splash at the drain connection or
the drain valve.
There is a risk of scalding.
During draining, air must be let into the accumulator
tank by opening a hot water tap, or through the vent
valve if one is fitted.
6
Chapter 2 | For the User
VESSEL
Drain the vessel by draining heating medium (XL10).
To ensure that the accumulator tank drains completely,
a hose or a pipe with an outlet below the lowest level
of the water heater must be attached to the drain con-
nection or drain valve. When installed where there is a
risk of frost, the accumulator tank must be emptied
whenever it is not in operation. Freezing could result in
the accumulator tank bursting.
Service
For service, contact the installer. Always state the serial
number (PZ3) and installation date.
Only replacement parts supplied by NIBE may be used.
NIBE VPC 500/750
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