iHE
34
GB/IE
4.0 SERVICING & MAINTENANCE
Health and Safety Statement :
This appliance contains no asbestos.
In all cases, before work commences turn
o
ff
the Mains Electricity and Gas Supply.
R
OUTINE
S
ERVICE
To ensure continued e
ffi
cient operation of the appli-
ance it is recommended that it is checked and serv-
iced at regular intervals.
The frequency of servicing will depend upon the
particular installation and usage but in every case
a maximum of twelve months should be allowed
between service inspections.
It is law that any service work should be carried
out by registered personnel.
4.1 RECOMMENDED SERVICING
1.
Check and clean the burner and combustion cham-
ber.
2.
Check condition of both electrodes and the gap of
ignition spark electrode.
3.
Check the air duct and
fl
ue seals.
4.
Check condensate syphon and pipework for leaks.
5.
Check the combustion CO, CO
2
and gas rate.
Follow the procedures given in section 4.2 for parts
removal in addition to the following notes.
1. B
URNER
& C
OMBUSTION
C
HAMBER
To view the burner and the inside of the heat ex-
changer it is suggested you remove the front of the
heat exchanger complete with the fan and gas valve:
•
Remove door and swing aside the controls panel.
•
Disconnect the gas cock
fl
ange from the gas
valve.
•
Unplug fan electrical connectors.
•
Remove the air tube from the main air stack or
by removing the spring clip (Fig 6.1) and pulling
o
ff
the
fl
exible hose.
•
Remove the connection plug and earth lead to
the spark generator.
• Pull
o
ff
the earth lead connection on the
gas valve and heat exchanger.
•
Undo the four nuts holding the heat exchanger
front and pull the whole assembly forwards.
•
Replace silicone door seal if there are any signs
of damage and in any case replacement every 2
years is recommended.
•
Heat exchanger deposits can be removed using a
non-metalic brush and vacuum cleaner, or loose
deposits can be
fl
ushed away into the condense
line using water.
•
Assembly is the reverse.
2. S
PARK
E
LECTRODE
AND
F
LAME
S
ENSE
E
LECTRODE
• Turn
o
ff
the appliance and
pull o
ff
the lead(s).
•
Undo the two screws retaining the spark
electrode assembly and carefully withdraw.
•
The spark gap should be 3.0 mm ± 0.5. There is a use-
ful gauge built into the burner door (Fig 6.1)
•
Undo the two screws retaining the
fl
ame sensing
electrode. Withdraw and inspect for wear or damage.
•
Replace electrode(s) if worn or damaged.
•
Assembly is the reverse, ensure the gasket
is undamaged and correctly placed.
Fig 6.1
Spark g
B
Spark gap gauge
3. A
IR
D
UCT
& F
LUE
S
EALS
A visual inspection should establish there are no leaks
around any of the seals, including the
fl
exible air duct
to the venturi. Replace if there is any doubt as to the
integrity of the seals.
4. C
ONDENSATE
P
IPEWORK
& S
YPHON
Inspect all joints in the condensate pipework for leaks,
repair/replace parts if any defects found.The lower bowl
of the syphon can be unscrewed, examined and cleaned.
check its connection to the heat exchanger and pipework
for leaks.
5. G
AS
R
ATE
& C
OMBUSTION
See the Datatable on the inside of the cover for the cor-
rect values. A combustion sample point is provided on the
individual
fl
ue outlet elbows.
To check, re-establish gas and electricity and then opper-
ate the heat engine for at least 5 minutes. If adjustment
is required remove the cover over the throttle screw and
turn anti-clockwise to increase CO
2
, clockwise to decrease.
(
Fig. 6.2
) Allow at least a minute between adjustments to
obtain stable readings. The gas rate will be correct when
the CO and CO
2
fi
gures are to speci
fi
cation.
Fig 6.2
Throttle Screw
Adjustment
Summary of Contents for iHE 100
Page 23: ...iHE 21 GB IE Fig 4 5 HC1 OPTIONAL HC2 ...
Page 24: ...iHE 22 GB IE Fig 4 6 HC1 IMMERSION HEATER BMS ...
Page 25: ...iHE 23 GB IE Fig 4 7 2 19 WIRING DIAGRAMS PCB 1 ...
Page 26: ...iHE 24 GB IE Fig 4 8 PCB 2 3 ...
Page 46: ...iHE 44 GB IE NOTES ...
Page 47: ...Notes ...
