Glow-worm 56/3e Back Boiler - Manual (Page 18)

18 221725B
Diagram 6.3
PRESSURE LOSS (mm head of water)
FLOW RATE (litres / minute)
700
With injector
fitted
Without
injector fitted
600
500
400
300
200
100
0 5 10 15 20 25 30
0
-100
7296
LIGHTING: SEQUENCE OF OPERATION
1. Switch on the electrical supply to the boiler
and heating sytsems.
2. Set external controls if fitted, to demand heat.
3. Turn the boiler control thermostat knob
fully clockwise to the maximum setting.
The lighting sequence is automatic as follows:-
4. Approximate 30 second purge.
5. Ignition initiated sparking at electrode
EV1 energised, (Pilot solenoid)
pilot lights.
6. EV2 energised, (Main burner solenoid)
main burner lights.
6 Commissioning
The back boiler is supplied preset to a maximum heat output
setting of 15.8 kW (54000 Btu/h) but may be adjusted to suit
design requirements.
This value 15.8 kW must not be exceeded when using the boiler
in combination with a Brown Ember 3, Black Ash 3 or Saxony
3 fire front.
If the boiler is used with a Miami 3 or Melody 3 fire front it is
permitted to increase the output to 16.4 kW (56000) Btu/h).
If adjustment is required:
Light the boiler and run for TEN MINUTES.
Turn adjustment screw “G”, to suit system design heat input,
see diagram 6.1.
Should any doubt exist, the gas rate should be checked at the
gas meter.
The rate of the back boiler should be within the range:
For Saxony, Black Ash, Brown Ember:
1.15m 3 /h (40.5ft 3 /h) to 1.86m 3 /h (65.7ft 3 /h)
For Melody, Miami:
1.15m3/h (40.5ft 3 /h) to 1.94m 3 /h (68.5ft 3 /h)
Note, if the gas rate is checked, make sure that all other gas
appliances and pilot lights are turned off.
Turn control thermostat knob “A” anti-clockwise to “0”, “Off”
position. Remove pressure gauge and replace test point screw
ensure a gas tight seal is made.
Relight the back boiler by turning thermostat knob “A” clockwise
to “MAX”.
Use the self adhesive arrow from the fittings pack and stick it
against the relevant heat input figure on the Data Label.
Refer to sequence of operation below.
6679
Diagram 6.2
6357 13mm FLAME
DIMENSION
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 4.8.
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 6.3.
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 “MAX” 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 “Off” and
rapidly drain the system whilst still hot, to complete the flushing
process.
Refill the system, vent and check again for water soundness.
6.2 Testing the Back Boiler Controls
To test the lockout device, turn the boiler on. After about 3
minutes, turn the gas off at the gas service cock, the lockout
device should now operate. This is indicated by the red light
coming on at the reset button.
To restart the boiler, turn on the gas supply at the gas service
cock and press the lockout reset button “E”.
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.
If removed refit the combustion chamber extension.