9
16
FAN OPERATES, BUT BURNER CYCLES BEFORE REQUIRED TEMPERATURE IS REACHED
DOES
THE BURNER
CONTINUE TO
CYCLE?
REPLACE
THERMISTA-STAT
N
CHECK RETURN AIR PATH
FOR RESTRICTIONS
Y
CHECK TEMPERATURE RISE.
IF LESS THAN 60
O
C, LINK
TERMINALS ‘13’ & ‘14’
Y
DOES
THE BURNER
CONTINUE TO
CYCLE?
DOES
THE BURNER
CONTINUE TO
CYCLE?
Y
N
REPLACE FAN DELAY/
LIMIT CONTROL
REPLACE
ELECTRONIC
MODULE
DISCONNECT THERMISTA-STAT
AT TERMINALS ‘7’ & ‘8’, LINK
TERMINALS ‘7’ & ‘TEST’
DO NOT LINK ‘7’ &’8’
7.
INSTRUCTIONS FOR USERS
7.1
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.
7.2
If the building is occupied, hand the User Instructions over and ensure the User understands:
7.2.1
How to ignite the pilot and burner.
7.2.2
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.
7.2.3
How to extinguish the pilot and main burner at the Multifunctional control, and switch off 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 for new houses, weekly).
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 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 at Sect 6.1
to 6.8 inclusive. Replace any sealing gasket or insulation that is damaged before re-commissioning, taking
care to not disperse fibrous materials.
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 para 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, as shown in para 8.10.
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.
8.1.13 If no defects are found, fully commission the air heater in accordance with the Installation, Commissioning and
Maintenance instructions applicable to the appliance.
