17
221790B
6 Commissioning
Diagram 6.1
8042
2 to 4mm
12 to 14mm
F
A
ELECTRICAL
CONTROL BOX
B
THERMOSTAT
CONTROL KNOB
C
GAS SERVICE
COCK (SHOWN IN
OFF POSITION)
D
MULTI-FUNCTIONAL
CONTROL
E
PRESSURE TEST
NIPPLE
F
GAS BURNER
PRESSURE SCREW
G
PIEZO UNIT BUTTON
H
WINDOW PILOT
K
CONTROL BUTTON (GAS)
M
COVER SECURING SCREW
N
PILOT BURNER PRESSURE
SCREW
B
A
D
M
K
C
N
E
G
H
3810
Diagram 6.2
Please ensure the "Benchmark" logbook is completed and left
with the user.
6.1
Make sure that the system has been thoroughly flushed out with
cold water without the pump in place.
Refit the pump, fill the system with water, making sure that all
the air is properly vented from the system and pump.
Before operating the boiler check that all external controls are
calling for heat.
6.2 Initial Lighting and Testing
CAUTION. This work must be carried out by a competent
person, in accordance with the current issue of BS6798.
Make sure that all naked lights and cigarettes are out.
Identify the controls by reference to diagram 6.1.
Turn the control thermostat knob “B” to “O” the Off position.
Remove gas pressure test point screw “E” and fit a suitable
pressure gauge.
Turn the electrical supply on and check that all remote controls
are calling for heat. Check that the pump is circulating water
through the system.
Turn on the main gas supply and purge in accordance with the
current issue of BS6891.
Turn boiler gas service cock “C” “On”.
Push in control button “K”, keep pressed in and at the same time
operate the piezo unit button “G” until the pilot burner lights.
After the pilot burner lights keep the button “K” pushed in for 20
seconds. If the pilot fails to stay alight a safety device in the
multi-functional control prevents immediate relighting.
Do not attempt to relight until the safety device has reset, that is,
after a minimum of three minutes.
Make sure that the pilot is alight and stable, view through
window “H”.
Check the length of the pilot flame, it should envelop the
thermocouple tip as shown in diagram 6.2. The pilot rate can be
adjusted, if necessary, by turning the pilot burner adjustment
screw “N”, having first removed the multi-functional control
cover by releasing the screw, see diagram 6.1. Check the pilot
supply connection for gas soundness, using a suitable leak
detection fluid.
Fit the case by hooking it under at the top and securing with the
wing nuts previously removed, see diagram 6.3.
Set the control thermostat knob “B” between “MIN” and “MAX”
- “MAX” is about 82
o
C (180
o
F) and check that the burner lights
smoothly. Check all the gas connections for soundness with a
suitable leak detection fluid.
To set the burner pressure, operate the boiler for ten minutes,
adjust the gas rate screw “F”, see diagram 6.1 until the required
pressure is obtained, see relevant Table 2 for setting pressures.
Should any doubt exist about the gas rate, check it using the gas
meter test dial and a stop watch, at least ten minutes after the
burner has lit, make sure that all other gas burning appliances
and pilot lights are off.
These figures are offered as a guide only.
Stick the self adhesive arrow, from the loose items pack, in the
appropriate place of the “MIN” “MED” and “MAX” column of the
Data Label.
Remove the pressure gauge and refit the test point screw,
making sure a gas tight seal is made.
8046
m
3
/h
1.70
ft
3
/h
60.0
Gas Rates After 10 Minutes
