ZZ757/9
ZZ757/9
8
9.2
MULTIFUNCTIONAL CONTROL REMOVAL:
9.2.1
Ensure that the gas and electrical supplies are switched off.
9.2.2
Remove the heater front cover.
9.2.3
Remove the 2 x screws securing the heater front door, and the open front door.
9.2.4
Remove the central securing screws and disconnect the 2 x electrical plugs from the Multifunctional control.
9.2.5
Disconnect the two 6mm and one 8mm pipes from the top of the multifunctional control.
9.2.6
Disconnect the gas supply union from beneath the multifunctional control.
9.2.7
Remove the 2 x screws securing the multifunctional control mounting bracket to the heater body, and withdraw
the multifunctional control.
9.2.8
Refitting or replacement is in reverse order.
Note:
If the multifunctional control is to be replaced, transfer the
pipe fittings and mounting bracket to the new unit.
9.3
BURNER ASSEMBLY REMOVAL:
9.3.1
Referring to 9.2, remove the multifunctional control.
9.3.2
Disconnect the igniter lead from the ignition/detection electrode.
9.3.3
Disconnect the gas feed pipe from the burner assembly.
9.3.4
Remove the four hexagonal burner manifold fixing screws from the manifold front flange, and slacken the three
hexagonal screws at the rear of the manifold.
9.3.5
Slide the manifold down to disengage the air connection, and then forward to disengage the rear screws. Withdraw
the burner manifold and burner face plate.
9.3.6
Refitting or replacement is in reverse order, ensuring that the metal fibre on the burner face plate is
TOWARDS
the manifold.
9.4
BURNER ASSEMBLY CLEANING:
9.4.1
Referring to 9.3, remove the burner assembly.
9.4.2
Using a soft brush, lightly brush the burner manifold inside and out, taking care to avoid damaging the injector.
9.4.3
Using a vacuum cleaner with nozzle attachment, carefully clean the burner face plate element if necessary.
DO
NOT USE
a wire brush or sharp implement, since the element is fragile and easily damaged.
9.5
AIR CIRCULATION FAN REMOVAL AND CLEANING:
9.5.1
Ensure that the electrical supply is switched off.
9.5.2
Remove the heater front cover.
9.5.3
Remove the six screws securing the fan chamber cover and remove the cover.
9.5.4
Remove the lower of the two capacitors from its spring clip.
9.5.5
Remove the air circulation fan securing screw, and slide the fan from its locating channel.
9.5.6
Supporting the air circulation fan, disconnect 2 x black, and 1 x green/yellow conductors from the terminal block
situated on the fan casing.
9.5.7
Remove all dust from both the impeller and motor, taking care to avoid disturbance of the fan balancing.
9.5.8
Refitting or replacement is in reverse order, referring to Fig. 7 for correct wiring.
9.6
REMOVAL OF INJECTOR:
9.6.1
Referring to 9.3, remove the burner assembly.
9.6.2
Using 14mm A/F ring spanner, undo the nut and washer, and remove injector from burner manifold.
9.6.3
Refitting or replacement is in reverse order.
9.7
FUSE REPLACEMENT:
9.7.1
Ensure that the electrical supply is switched off.
9.7.2
Remove the heater front cover.
9.7.3
Remove the 2 x screws securing the heater front door, and open front door.
9.7.4
Replace the appliance fuse, situated in the inside of the front door at the top left hand side.
The only fuse to be
fitted is 20mm, T3.15 (slow blow)
.
7
Fig. 5
Multifunctional control
8.
INSTRUCTIONS FOR USERS
8.1
If the building is unoccupied, ensure that the Instructions for User are left taped to the air heater for the User, and
Installation Instructions are left at or near the air heater for use on future service calls.
8.2
If the building is occupied, hand the User Instructions over and ensure that the User understands:
8.2.1
How to operate the Thermista-stat/room thermostat, time and heater ON/OFF switch and summer air circulation
switch, and that the time control must be reset following a power failure.
8.2.2
How to turn off the appliance, and switch off electrical supply to the heater.
8.2.3
How to remove, clean and refit the air filter and at what intervals (i.e. fortnightly, or for new houses, weekly).
8.2.4
How to control the heating system by opening and closing warm air outlets.
8.2.5
That the heater must be serviced at least once a year by a competent person to ensure efficient and safe operation.
8.2.6
That the red instructions for safe use have been pointed out and understood.
8.2.7
That the air grilles on the heater or heater compartment; grilles and ventilators in the walls, windows or doors of
the building must not be obstructed.
8.2.8
That expert help must be obtained if malfunction of the appliance occurs.
8.2.9
How to obtain summer air circulation.
8.2.10 How to rest the appliance if LOCKOUT occurs.
9.
SERVICING
IMPORTANT:
Ensure that gas and electricity supplies are isolated before commencing any maintenance or
replacement of components. After completion of any maintenance, always test for gas soundness and
carry out a complete functional test of the appliance in accordance with Commissioning Instructions.
9.1
ROUTINE MAINTENANCE:
9.1.1
Operate appliance and check for correct function.
9.1.2
Clean the air circulation fan and the air filter.
Note:
The air/fuel ratio is controlled automatically and therefore combustion is and will remain extremely clean. In the
unlikely event of this ratio deviating from the norm, the system will lock out. It is, therefore, not necessary to remove the
burner assembly for internal inspection during an annual service.
9.1.3
Reassemble all items in reverse order and carry out the commissioning procedure as detailed in Sect 6.
Burner pressure test
point
Inlet pressure test point
