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Pre-Commissioning Checks; Boiler Function; Fault Finding - Bosch Worcester 7 716 192 566 Installation Instructions Manual

Wall hung rsf gas fired condensing boiler, greenstar i system diverter valve kit

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PRE-COMMISSIONING CHECKS

7
PRE-COMMISSIONING CHECKS
NOTICE: If the boiler is not to be commissioned
immediately then:
▶ after successfully completing all of the checks and any
rectification work, close the gas and water valves,
shut off the gas supply, electrically isolate the boiler
and label appropriately.
1. Check that the service and water pipes are connected to the correct
position on the manifold.
– 1 - CH and cylinder flow (22mm)
– 2 - Gas inlet (22mm)
– 3 - Cylinder Return (15mm)
– 4 - CH Return (22mm)
1.
2.
Fig. 23 Pipe connections
2. Check the gas type specified on the identification plate matches that
of the gas supply. Turn on the main gas supply, check the gas
pipework, connections and rectify any leaks.
3. Check that the condensate pipe has been connected to the syphon.
4. Check pressure relief drain pipe is correctly fitted and securely
tightened.
NOTICE:
▶ NOW RETURN TO THE I SYSTEM INSTRUCTION
MANUAL (FILLING THE SYSTEM) TO CONTINUE
INSTALLATION.
12
3.
4.
8

BOILER FUNCTION

8.1

FAULT FINDING

If in the unlikely event the boiler does not give complete satisfaction,
before calling for a service engineer, the installer should check the
following:
FOR BOILERS WITH INTEGRAL DIVERTER VALVE AND CONTROLS
NO CENTRAL HEATING, BUT HOT WATER OK
Remove the room stat wiring from L
ST10. Fit a link between L
and L
S
be a problem with the room stat or wiring to it.
NO HOT WATER, BUT CENTRAL HEATING OK
Do NOT link out the cylinder sensor, it is a PTC device.
Only link out the cylinder thermostat to check the
operation of the boiler.
If a cylinder thermostat is used, remove the cylinder stat wiring from 7
and 9 on the terminal block ST8. Fit link across 7 and 9.
If the HW now functions, the problem may be with the cylinder
thermostat or wiring to the thermostat.
FOR ALL BOILERS WITH INTERNAL OR EXTERNAL CONTROLS
Burner lights then goes out in DHW or CH mode
Does the boiler run normally with the front cover off and then fail when
the cover is put back on?
If yes there is likely to be a flue problem - either the air inlet is blocked or
the inner flue is leaking flue gases into the air inlet.
BOILER NOISY OR GOING TO OVERHEAT
1. Was the system flushed?
2. Has the pump been bled and the dust cap released?
GENERAL CHECKS
1. Is all the air bled from the gas supply?
2. Is all the air bled from the primary water system?
3. Is there 230v a.c. across the boiler live and neutral terminals?
(L & N on ST10)
4. Is the polarity correct?
5. Is the incoming gas pressure at least 16.5mbar at the gas valve with
the boiler at maximum output?
i System Diverter Valve kit 6 720 645 222 (2012/09)
, L
and N from terminal block
S
R
, if the CH now works there is likely to
R

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