22
INSTALLATION
isar -
Installation and Servicing
2025
Condensate
drain
Front view
155mm
Side view
Diverter valve
(shown in the
CH position)
Forward position
indicates DHW
Automatic
air vent
Cap
Vent
plug
2026
Pump
Rotate the
shaft to free
a.
b.
c.
28
CONDENSATE DRAIN
Refer also to the British Gas document: 'Guidance Notes for
the Installation of Domestic Gas Condensing Boilers' (1989).
The condensate drain (provided in the h/ware pack) must be
connected from the boiler ‘S’ trap to a drainage point,
preferably within the building.
Ensure that the condensate trap is full of water before
commissioning the boiler . Refer to Frame 23.
The routing of the drain must be made to allow a minimum
fall of 1 in 20 away from the boiler, throughout its length.
The drainage pipework must be arranged so that obstruction
(e.g. through freezing) of external drainage pipe does not give
rise to spillage within the dwelling.
IMPORTANT.
If excessive external pipework cannot be avoided an
additional siphon kit and insulation are recommended to
prevent possible freezing.
All pipework and fittings in the condensate drain system
must be made of plastic. No other materials may be used.
The drain outlet on the boiler is standard 21.5mm overflow
pipe. This size must not be reduced in any part of its length.
29
FILLING
Central Heating
1. Remove the boiler front and sealing panels. Refer to
Frames 42 & 43.
2. Swing the control box down into the servicing position.
Refer to Frame 44.
3. Ensure that the CH isolating valves are open.
4. Fill and vent the system. Check for water soundness.
IMPORTANT - when filling:
a. Remove the diverter valve actuator (refer to
Frame 60) and depress the spindle several times
during filling. Replace diverter valve actuator.
b. The cap on the automatic air vent MUST be loose
at all times. Refer to Frame 68.
When filling, there may be a slight water leak from the vent
therefore electrical connections should be protected.
c. Bleed any air from the pump and ensure that it is free to
rotate.
i. Remove the vent plug
ii. Using a screwdriver, rotate the shaft several times
iii. Replace the vent plug.
Note.
Some slight water leakage will occur.
Note.
The domestic hot water flow rate is automatically
regulated to a maximum of 12 l/min (2.6 gpm).
Domestic Hot Water
1. Fully open all DHW taps and ensure that water flows
freely from them.
2. Close all taps.
INST
ALLA
TION
Содержание isar m30100
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