Nibe VPB series User's And Installer's Manual page 20

Service and maintenance
NOTE
After servicing, complete the relevant Service
Interval Record section of the Benchmark
Checklist located at the back of this document.
Completion of the Service Interval Record is a
condition of warranty. For full terms and condi-
tions of warranty, please see our website
www.nibe.co.uk.
NOTE
Any servicing must be carried out by a compet-
ent person.
Maintenance
General inspection
Check the following:
1. Condition of casing.
2. Electrical connections.
3. Pipe connections.
Correct any fault before continuing.
Water heater
Check the following:
1. Pressure controlled bypass valve.
2. T&P valve.
3. Overflow pipe.
4. Pressure expansion vessel.
Correct any fault before continuing.
Service actions
Safety valves
The function of the safety valves must be checked regu-
larly. Perform checks as follows:
1. Open the valve by turning the knob anti-clockwise
carefully.
2. Check that water flows through the valve.
3. Close the valve by releasing it. If it does not close
automatically when released, turn it anti-clockwise
slightly.
NOTE
Do not remove or adjust any components that
are part of this pressurised water heater. Contact
your installer!
NOTE
If this pressurised water heater develops a fault,
e.g. a flow of hot water from the overflow pipe,
turn the heat pump off and contact your in-
staller.
20 Chapter 3 | For the Installer
Cleaning
Inspect and clean the water heater by using a suitable
instrument such as an endoscope. The hot water connec-
tion (XL4) must be removed to facilitate access.
When the water heater and the climate system have
been filled with water, VPB/VPBS must operate at max-
imum normal temperature for at least one hour. There-
after the system must be drained of water and refilled.
Emptying the system by
1. Open external filler valve and external drain valve.
2. Flush the system for some minute. Watch out for
water splashes from the safety valve.
3. Close the valves and check the stainer.
Emptying
The water heater is emptied through the siphon (with
hose) in the cold water connection (XL3).
Drain the coil section through the siphon (with hose) on
the docking connection, return to heat pump (XL9).
Drain the solar coil through the siphon (using hose) on
the connection, return to solar heating system (XL14).
XL3
VPB 300
XL4
XL3
VPBS 300
XL9
XL9 XL14
VPB/VPBS