10
11
7.
INSTRUCTIONS FOR USERS
7.1
If the building is unoccupied, ensure that the Instructions for the User are left taped to the air heater, and that the Installation,
Commissioning and Maintenance Instructions are left at or near the air heater for use on future service calls.
7.2
If the building is occupied, hand the User Instructions over and ensure that the User understands:
7.2.1
How to ignite the Pilot and Main Burners.
7.2.2
How to operate the Thermista-stat/room thermostat, Time Control, heater ON/OFF switch and summer air circulation
switch, and that the Time Control must be reset following a power failure.
7.2.3
How to extinguish the Pilot and Main Burner at the Multifunctional Control, and switch off the electrical supply to the
heater.
7.2.4
How to remove, clean and refit the air filter and at what intervals (i.e. fortnightly, or weekly for new houses.)
7.2.5
How to control the heating system by opening and closing warm air outlets.
7.2.6
How to obtain summer air circulation.
7.2.7
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.
7.2.8
That the heater must be serviced at least once a year by a competent person to ensure efficient and safe operation.
7.2.9
That the red instructions for safe use have been pointed out and understood.
7.2.10 That expert help must be obtained if persistent failure of the pilot burner occurs.
8.
MAINTENANCE
IMPORTANT: Ensure that the 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 the Commissioning Instructions at Sect 6.1 to 6.8 inclusive.
8.1
ROUTINE MAINTENANCE:
8.1.1
Operate the appliance and check for the correct function of the burner and controls.
8.1.2
Turn OFF the gas and electrical supplies to the appliance.
8.1.3
Remove the air heater front panel.
8.1.4
Remove and check the return air filter/cleaner for cleanliness, remove and clean the Air Circulation fan as detailed in s. 8.8.
8.1.5
Remove the Burner and Controls Assembly as detailed in para 8.2. Inspect and clean the Main Burner and injector as
necessary. Examine the Main Burner for cracks, including hairline cracks, exchanging the burner as necessary.
8.1.6
Inspect and clear the pilot burner orifice.
8.1.7
Clean the heat exchanger flueways by thoroughly brushing from above and below.
8.1.8
By viewing through the Fan Aperture, and using a torch or similar, examine the heat exchanger externally for signs of
cracks or holes, particularly around welded joints.
8.1.9
Using a torch or similar, introduce a light source into the heat exchanger burner aperture and upper access port, and
again examine the heat exchanger for signs of cracks or holes, particularly around welded joints, whilst again viewing
through the Fan Aperture.
8.1.10 Refit the Air Circulation fan, Burner and Controls Assembly, and air filter/air cleaner.
8.1.11 Light the appliance and note the main burner flame profile. If the flame profile is affected when the Air Circulation fan
switches on, check for any air leaks between the air heater and the base plenum, paying particular attention to
heaters with rear draught diverters. Rectify any air leaks before continuing with this procedure.
8.1.12 Allow the air heater to operate for approximately 15 minutes to ensure stability, and with the main burner lit, ensure
that the operation of Air Circulation fan does not affect the main burner flame profile.
8.2
BURNER AND CONTROL ASSEMBLY REMOVAL:
8.2.1
Ensure that the Gas and Electrical supplies are switched OFF
8.2.2
Remove the appliance lower front door.
8.2.3
Disconnect the igniter at the Piezo unit.
8.2.4
Disconnect the Multifunctional Control electrical connection.
8.2.5
Disconnect the water heater (if necessary).
8.2.6
Disconnect the gas supply by breaking the union at the input side of the Multifunctional Control.
8.2.7
Remove 6 x Burner Assembly fixing screws and withdraw the Burner Assembly.
8.2.8
Refit the Burner and Control Assembly in reverse order, ensuring that the spillage baffle above the Burner Assembly
contacts the top of each burner arm.
8.3
MAIN BURNER ASSEMBLY CLEANING:
8.3.1
Remove the Burner and Control Assembly as detailed in 8.2.
8.3.2
Clean the burner thoroughly both inside and out with a soft brush.
DO NOT ENLARGE, DISTORT OR DAMAGE
BURNER HOLES.
8.3.3
Reassemble in reverse order.
8.4
MAIN INJECTORS REMOVAL, CLEANING AND REPLACEMENT:
8.4.1
Remove the Burner and Control Assembly as details in 8.2
8.4.2
Remove 2 x screws securing the Pilot Burner assembly to the Burner and Control Assembly and withdraw the Pilot
Burner assembly, taking care to avoid damage to the Thermocouple Capillary.
8.4.3
Remove 2 x screws securing the Burner Arm to the Burner and Controls assembly, and withdraw the Burner Arm.
8.4.4
Unscrew 2 x main injectors, and 1 x cross lighter injector from their housings.
8.4.5
Clean as necessary.
DO NOT ENLARGE, DISTORT OR DAMAGE MAIN INJECTOR HOLES.
8.4.6
If the injectors are to be replaced, ensure that they are correctly marked, referring to the Data Badge for details.
8.4.7
Refit or replace the injectors in reverse order.
mbar in.wg.
0.50
0.20
0.375 0.15
0.25
0.10
350
400
450
500
550
600 ft
3
/min
0.165
0.189
0.212
0.236
0.256
0.283 m
3
/sec.
AIR VOLUME
Response
Area
kW
MJ/h
Btu/h
Input
18.72
67.4
63,900
Output
14.65
52.75
50,000
Gas Rate
1.81m
3
/h (64.1ft
3
/h)
Burner Setting
Pressure
35.8mbar (14.3 in wg)
Main Injector
AMAL 187/001/290
Table 4
Main Burner Pressure Settings
Table 5
Fan Performance Curve
