For The User - Nibe VPB 500 User's And Installer's Manual

2 For the User

Maintenance
The safety valve must be inspected regularly (about four
times a year) to prevent blockages.
To inspect the valve, open the safety valve manually and
check that water flows through the overflow pipe. If this
does not happen then the safety valve is defective and
must be replaced.
The safety valve sometimes releases a little water after
hot water has been used. This discharge is caused by the
expansion of cold water entering the water heater, res-
ulting in a pressure increase, whereby the safety valve
opens.
Emptying
1. Turn off the power to the water heater.
2. Shut off the incoming cold water.
3. Open the drain connection, or the drain valve (en-
closed) if installed.
During draining, air must be let into the water heater by
loosening a hot water connector (XL4) or opening a hot
water tap.
To ensure that the water heater drains completely, a
hose, or a pipe, with an outlet below the lowest level of
the water heater must be attached to the drain connec-
tion or drain valve. When installed in a location that is
exposed to the risk of frost, the water heater must be
emptied whenever it is not in operation. Freezing will
result in the water heater bursting.
Dealing with malfunctions
If the water fails to heat up, check the fuses in the elec-
trical distribution unit. If none of the fuses have blown,
the problem may be that the temperature limiter has
tripped as a result of a fault in the water heater. Once
the fault has been remedied, the temperature limiter
can be reset. This must be done under the supervision
of a qualified electrician.
Service
For service, contact the installer. The serial number (PF3)
(14 digits) and installation date should always be stated.
Only replacement parts supplied by NIBE may be used.
VPB 500, 750, 1000 | GB 19