Glow-worm BBU 45/4 - Manual (Page 20)

20 2000225023C
Diagram 6.4
9644
6 Commissioning
Diagram 6.3
9520
13mm FLAME
DIMENSION
6.2 Testing the Back Boiler Controls
To test the flame failure, turn the boiler on. After about 3
minutes, turn the gas service cock off, the lockout device should
now operate. This is indicated by the red light coming on at the
back boiler control panel.
To restart the boiler, turn on the gas supply at the gas service
cock and turn the control thermostat knob "A" anti-clockwise to
the "Reset" position then clockwise to maximum.
DO NOT ATTEMPT TO RELIGHT UNTIL AT LEAST 3 MINUTES
HAVE GONE BY.
Check that the boiler thermostat control and any external
controls operate the back boiler correctly.
NOTE. If the electrical supply is switched rapidly off and on
without gas present the control will purge for 100 sec. Neither
of the indicators will be lit. The appliance will then operate
correctly.
6.3 Clearance of Products
A clearance of products (spillage) test must be carried out after
installation of the back boiler and it's fire.
Before fitting the fire, check that the heat exchanger baffles are
fitted and seated correctly, see Section 4.9.
Details of the necessary tests to be carried out will be found
under “TEST FOR CLEARANCE OF PRODUCTS” in the Fire
Front Installation Instruction Booklet.
Note: This test must only be carried out after the fire front has
been fitted to the back boiler unit.
6.4 Commissioning the System
Set all controls to operate the heating system. Adjust circulating
pump and balance the system to give a temperature drop
across the boiler of 11
o C (20 o F). At the appropriate flow rate, the
resistance of the back boiler can be found by reference to
diagram 6.4.
There should be no undue noise in the pipework or heat
emitters. There must be NO pumping over of water or entry of
air at the open vent pipe above the feed and expansion cistern.
Make sure the back boiler control thermostat knob "A" is turned
clockwise to maximum, which is about 82
o C (180 o C), against
the setting point, allow the water to reach maximum working
temperature. Examine the system for water soundness.
Turn the control thermostat knob "A" anti-clockwise to "RESET"
(OFF) and rapidly drain the system whilst still hot, to complete
the flushing process.
Refill the system, vent and check again for water soundness.
Isolate gas at gas service cock ‘C’ and the electrical supply to
the back boiler until the fire front is fitted.