Specifications

Installation & Servicing Instructions E-Range
9
6 Connecting the boiler
The boiler has the following connection pipes;
- The central heating pipes.
These can be connected to the installation by means of compression fittings /
adapter fittings. Install the supplied service valves directly under the boiler;
- The gas pipe.
It is provided with a female thread into which the tail piece of the gas valve can be
screwed;
- The condensation drain pipe.
It consists of a 22mm plastic pipe. The drain pipe can be connected to this by means
of an open connection. If the open connection is fitted in a different location, then the
pipe can be lengthened by means of a 32 mm PVC sleeve;
- The flue gas exhaust system and air supply system.
It consists of a concentric connection 80/125 mm.
Isolation valves fitted to the connections should be by way of a union fitting
to allow removal of the appliance.
It is advisable to spray-clean all of the boiler’s connecting pipes and/or to
spray-clean/blow-clean the installation before connecting it to the boiler.
6.1 Central heating system
Connect the central heating system according to the actual regulations.
The boiler pipes can be connected to the installation by means of compression fittings.
Reducers should be used for connecting to thick-walled pipe (welded or threaded). Install
the supplied service valves directly under the boiler in the flow and return pipe.
When removing the plastic sealing caps from the pipes, contaminated testing
water may be released.
The boiler has a self-adjusting and self-protecting control system for the load. This means
the temperature difference between the flow and return water is checked. Table 3 shows the
water displacement which supplies the circulation pump at a certain installation
resistance.
If the installation resistance is higher than the stated value the load will be adjusted until
an acceptable temperature difference between flow and return water has been obtained.
If, after this, the temperature difference remains too much then the boiler will switch itself
off and wait until an acceptable temperature has been reached.
If an unacceptable temperature is detected, then the control will repeatedly try to achieve
water flow, and if this does not work then the boiler will switch off.
If the capacity of the boiler pump is insufficient, an extra external pump can be installed
in combination with a low velocity header in series with the boiler. The electrical side of
this external circulation pump can be connected in the Control Tower on connection 4,5
and 6, by means of an optional connector, which can be ordered seperately (art.nr.
S4351300). The external pump will switch at the same times as the boiler pump.
type of unit
Pump
type
water flow rate
'
''
'T 20°C
permissible
installation
resistance
l/min l/h kPa mbar
E32S
UP 20-60 20.7 1244 17 170
Installation resistance table 3