Potterton iHE 100, Installation & Servicing Instructions Manual

Page: 39 / 48

iHE 37 GB/IE
• Remove the whole burner system using the
four retaining nuts holding the heat exchanger
door to the body. (
fi g 6.6).
• Remove the fl ue elbow by lifting it up and
away from the heat exchanger.
• The heat exchanger is now only retained by the
two side brackets and releasing the four front
screws will enable it to be pulled forward. Be-
fore releasing ensure there is support available
(see
fi g 6.7)
• Replacement is the reverse.
H
EAT
E
NGINE
C
IRCULATION
P
UMP
These are located on the return pipes of the Heat
Engines (see Fig 7.1, item 28).
•
Drain as much of the primary water as is neces-
sary to ensure the pump is empty.
• Remove the lid of the pump wiring box and
disconnect the supply lead.
• Undo the two water connections and remove
the pump.
• Transfer the supply lead to the new pump.
• Replacement is the reverse.
• Re fi ll and check for leaks.
P
RIMARY
DHW P
UMP
This single pump is located between the Low Loss
Header and the plate heat exchanger (see Fig 7.1,
item 27)
•
Drain as much of the primary water as is neces-
sary to ensure the pump is empty.
• Remove the lid of the pump wiring box and
disconnect the power supply lead.
• Undo the two water connections and remove
the pump.
• Transfer the supply lead to the new pump.
• Replacement is the reverse.
• Re fi ll and check for leaks.
S
ECONDARY
DHW P
UMPS
These are located on the pipes from the plate heat
exchanger going to the tank (see Fig 7.1, item 29).
• Turn
o ff the two valves fi tted between the
tank and pumps.
• Drain as much of the secondary as is necessary
to ensure the pump is empty.
• Remove the lid of the pump wiring box and
disconnect the power supply lead.
• Undo the two water connections and remove
the Pump.
• Transfer the supply lead to the new pump.
• Replacement is the reverse.
• Re fi ll and check for leaks.
Fig 6.6
Heat Exchanger mounting screws
Fig 6.7
Heat exchanger door screws