Potterton iHE 100 Installation & Servicing Instructions Manual page 38

G V
AS ALVE
• Carefully remove the electrical connector.
• Release the gas cock by undoing the four bolts
holding it onto the gas valve.
• Remove the off set tube from the gas valve and
unscrew the off set connector (small blue threaded
tube) and transfer to the new gas valve.
• Release the gas valve from the venturi by
undoing three screws (see fi g 6.5).
• Transfer the rubber gasket to the new gas valve.
• Replacement is the reverse.
• Fire the boiler and check for gas leaks.
• After fi ve minutes check the rate and combustion
is correct to the Datatable. (inside cover). Adjust
using the throttle on the gas valve (see fi g 6.2).
NB Valve Coil resistances are 2.8k and 1.6k ohms.
A
IR INTAKE TUBE AND AIR CONTROL FLAP
• Remove off set air tube from gas valve.
• Using a pair of pliers, compress the spring clip and
pull hose off venturi (see fi g 6.3)
• Pull other end slowly off the air intake manifold.
• Replacement is the reverse.
Spring Clip
C F
OMBUSTION AN
• Carefully remove the two electrical connectors on
the Fan.
• Remove the two screws holding the venturi to the
Fan, retain the gasket between them.
• Undo the four nuts and washers holding the fan to
the heat exchanger and withdraw.
• Transfer the venturi gasket to the new fan.
• Replacement is the reverse.
V
ENTURI
• Remove the gas valve, see above.
• Pull off the air tube (Fig 4.1)
• Undo the two screws holding the venturi to the
fan and remove.
• Ensure the gasket is transferred to the new Ven-
turi or positioned on the fan before positioning the
replacement.
• Replacement is the reverse.
• Operate the heat engine and check for gas leaks.
iHE
•
H
•
•
•
•
Off set air tube
•
Air Control Flap
Fig 6.3
•
36
After fi ve minutes check the rate and combustion
is correct to the Datatable. (inside cover). Adjust
using the throttle screw on the gas valve clockwise
to decrease CO , anti-clockwise to increase CO
2
required. (Fig. 6.2)
The following components require the
draining of the primary or secondary. It
is essential that all the air is removed
from the heat exchanger before the
appliance is operated. To not do so would
damage the heat exchanger and invalidate
the warranty.
E
EAT XCHANGER
Drain as much of the primary water as is necessary
to ensure the heat exchanger is empty.
Disconnect all electrical connections to the fl ue
sensor, spark generator, fan and gas valve.
Disconnect the air tube and air control fl ap (see
previous section)
Release both the heat exchanger demountable
connections of the fl ow and return pipes, by
removing the metal clips and pulling the pipes
downwards (see fi g 6.4)
Disconnect the condense drain connection by
releasing the plastic clip on the top connector (see
fi g 6.4)
Disconnect the gas valve from the venturi by re-
moving the three securing screws (see fi g 6.5)
Remove three screws
2
Condense
drain clip
Flow / Return Clips
Fig 6.4
Fig 6.5
GB/IE
if