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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
nibe.co.uk.
NOTE
Maintenance may only be carried out by per-
sons with the necessary expertise.
When replacing components on VPB S/ VPBS S
only replacement parts from NIBE may be
used.
NOTE
NOTE
Use only manufacturer's recommen-
ded replacement parts.
MAINTENANCE
General inspection
Check the following:
Condition of casing.
1.
2.
Electrical connections.
3.
Pipe connections.
Correct any fault before continuing.
Water heater
Check the following:
1.
Pressure controlled bypass valve.
T&P valve.
2.
Overflow pipe.
3.
Pressure expansion vessel.
4.
5.
Expansion relief valve.
Correct any fault before continuing.
SERVICE ACTIONS
Safety valves
The function of the safety valves must be checked reg-
ularly. Perform checks as follows:
NIBE VPB S/ VPBS S
1.
Open the valve by turning the knob anti-clockwise
carefully.
Check that water flows through the valve.
2.
Close the valve by releasing it. If it does not close
3.
automatically when released, turn it anti-clockwise
slightly.
Cleaning
Inspect and clean the water heater by using a suitable
instrument such as an endoscope. The hot water con-
nection (XL4) must be removed to facilitate access.
When the water heater and the climate system have
been filled with water, VPB S/ VPBS S must operate at
maximum normal temperature for at least one hour.
Thereafter 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.
Chapter 3 | For the Installer
23
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