ZZ757/9
6
7.6.1
If the burner fails to light (amber ‘
LOCKOUT
’ illuminated): Reinstate the ignition sequence by allowing 10
seconds to elapse, and then press and release the ‘RESET’ button.
7.6.2
If the burner ignites but then extinguishes: An automatic purging sequence will take place, which lasts for
approximately 30 seconds. Following this, a second ignition will take place.
7.7
Set the time control (if fitted) to the required ‘Heating On’ periods and adjust the Thermista-stat to the desired comfort
setting. The burner will then initially operate at maximum output until it reaches the set comfort level, whereby the heater
modulates to maintain the required comfort level.
7.8
BURNER PRESSURE CHECK:
Note: The Burner pressure is factory set and MUST NOT BE ADJUSTED.
7.8.1
Turn the gas and electrical supplies to OFF.
7.8.2
Link Terminal block connection ‘
3
’ to ‘
TEST
’ terminal.
7.8.3
Referring to Fig. 5, remove and retain the Burner Pressure Test Point blanking screw, and fit pressure a test gauge
to the test point.
7.8.4
Turn
ON the gas and electrical supplies.
7.8.5
Reinstate the ignition sequence as detailed in sub-para 7.6.1
7.8.6
Ensure that the burner ignites, and allow 15 minutes of operation to elapse to ensure stability.
7.8.7
Referring to Table 3, ensure that the burner pressure is within the limits specified for the installed flue length.
7.8.8
If the differential burner pressure is not within the limits stated, run the appliance for a further 10 minutes and
then re-check the burner pressure. If the pressure is still not within the stated limits, contact Johnson and Starley
Ltd. Service Department, since rectification requires the use of special equipment.
7.8.9
Turn the gas and electrical supplies to OFF.
7.8.10 Remove the link from Terminal block connection ‘
3
’ to ‘
TEST
’ terminal.
7.8.11 Remove the pressure test gauge, and refit pressure test point blanking screw.
7.8.12 Turn
ON the gas and electrical supplies.
7.9
WARM AIR SYSTEM BALANCING:
7.9.1
Set the Thermista-stat to the
‘SUMMER AIRFLOW’
position (fully clockwise switched position), and check
that the air circulation fan is running full speed, without the burner operating.
7.9.2
Balance the system to provide the required volume proportions at the warm air outlets.
Note:
If the system includes ceiling diffusers, it is important that the velocities of air through these (except in
very small rooms such as bathrooms) are at least 1.5m/s (300ft/min). In order to achieve this, it may be necessary
to blank off part of the outlet face.
7.9.3
Reset the Thermista-stat to the require comfort level setting.
7.10
AUTOMATIC CONTROLS CHECK:
Lighting the heater and allowing it to operate for a short time will effectively
check these controls.
7.11
SAFETY CHECK:
7.11.1 Turn OFF the gas supply at service cock and ensure that Multifunctional control fail-safe operates (indicated by
loud click from Multifunctional control).
7.11.2 Turn the gas supply ON at service cock, and ensure that the burner ignites.
7.12
FAN PERFORMANCE:
No provision is made for fan speed adjustment, since the fan speed is automatically determined
by the appliance, and the demand for heat.
HORIZONTAL FLUE
VERTICAL FLUE
APPLICATIONS
APPLICATIONS
kW
MJ/h
Btu/h
kW
MJ/h
Btu/h
INPUT
9.80
35.3
33,500
10.5
37.8
35,800
OUTPUT
8.0
29.0
27,300
8.57
30.86
29,200
Gas rate cv
0.92m
3
/h (32.3 ft
3
/h)
1037 Btu/h
Burner setting
8.9mbar (3.6 in wg)
10.2mbar (4.1 in wg)
pressure (hot)
Main Injector
BRAY 15/850
Table 3
Main Burner Pressure Settings
ZZ757/9
9
9.8
TRANSFORMER REMOVAL:
9.8.1
Ensure that the electrical supply is switched off.
9.8.2
Remove the heater front cover.
9.8.3
Remove the 2 x screws securing the heater front door, and open front door.
9.8.4
Disconnect the leads from the transformer.
9.8.5
Release 2 x securing screws, nuts and lock washers, and withdraw transformer from the electrical panel.
9.8.6
Refitting or replacement is in reverse order, ensuring the leads are correctly reconnected to the transformer.
9.9
IGNITION/DETECTION ELECTRODE REMOVAL:
9.9.1
Referring to 9.3, remove the burner assembly.
9.9.2
Remove the securing nut and washer, and carefully remove the electrode from the burner.
9.9.3
Refitting or replacement is in reverse order, taking care to avoid bending the electrode since its profile is critical.
9.10
IGNITION MODULE REMOVAL:
9.10.1 Ensure that the electrical supply is switched off.
9.10.2 Remove the heater front cover.
9.10.3 Remove the 2 x screws securing the heater front door, and open front door.
9.10.4 Disconnect the ignition lead from the ignition module.
9.10.5 Disconnect the ignition module edge connector plug.
9.10.6 Remove the 2 x securing screws and withdraw the ignition module.
9.10.7 Refitting or replacement is in reverse order.
9.11
CONTROL MODULE REPLACEMENT:
9.11.1 Ensure that the electrical supply is switched off.
9.11.2 Remove the heater front cover.
9.11.3 Remove the 2 x screws securing the heater front door, and open front door.
9.11.4 Disconnect the ribbon cable from the combustion air fan, by gripping the plug.
Do not pull on the ribbon cable.
9.11.5 Disconnect the 2 x grey, and 1 x violet conductors from the transformer.
9.11.6 Disconnect the following conductors from the listed terminal strip connections:
a.
Pink from ‘
3
’,
b.
Pink from ‘
4
’,
c.
White from ‘
5
’,
d.
Yellow from ‘
10
’,
e.
Orange from ‘
12
’,
f.
Orange from ‘
13
’,
g.
Red from ‘
14
’,
h.
Blue from ‘
15
’.
9.11.7 Remove the 2 x securing screws and nuts, and remove the control module.
9.11.8 Refitting or replacement is in reverse order.
9.12
COMBUSTION AIR FAN REMOVAL:
9.12.1 Ensure that the electrical supply is switched off.
9.12.2 Remove the heater front cover.
9.12.3 Remove the 2 x screws securing the heater front door, and open front door.
9.12.4 Disconnect the ribbon cable from the combustion air fan, by gripping the plug.
Do not pull on the ribbon cable.
9.12.5 Remove 2 x screws securing the 6mm pipe to the combustion air fan, release the tubing nut at the multifunctional
control, and withdraw the 6mm pipe complete with clamping plate and gasket.
9.12.6 Remove the upper and lower screws securing combustion air fan, and withdraw the fan complete with gasket.
9.12.7 Refitting or replacement is in reverse order.
Important:
Ensure that both gaskets are undamaged, and that the flue connection is sound. Only use the securing
screws supplied, as longer screws will cause damage to the heat exchanger.
