System Details - Baxi Bermuda 45/4 M Installation And Servicing Instructions

SYSTEM DETAILS - Page 6
Water Circulating Systems
The appliance is suitable for open vented systems which are
either fully pumped or pumped central heating with gravity
domestic hot water.
An overheat thermostat modification kit is available where
additional control protection is required and for sealed
system applications. This must not be used on gravity
systems
The following conditions should be observed at all
times:
The static head must not exceed 30m (100ft) of
water.
The boiler must not be used with a direct cylinder.
Drain cocks should be fitted to all system low points.
All gas and water pipes and electrical wiring must
be installed in such a way that it does not restrict the
servicing of the boiler. Position isolating valves as
close as possible to the circulating pump
Treatment of Water Circulating Systems
For optimum performance after installation, this boiler and its
associated central heating system must be flushed in
accordance with the guidelines given in B57593: 1992
'Treatment of water in domestic hot water central heating
systems'.
This must involve the use of a proprietary cleanser, such as
BetzDearborn's Sentinel X300 or X400, or Fernox's
Superfloc. Full instructions are supplied with the products,
but for immediate information, please contact BetzDearborn
on 0151 420 9563, or Fernox on 01799 550811.
For long term protection against corrosion and scale, after
flushing, it is recommended that an inhibitor such as
BetzDearborn's Sentinal X100, or Fernox's MB-1 or Copal is
dosed in accordance with the guidelines given in B5S593:
1992.
Failure to flush and add inhibitor to the system may
invalidate the appliance warranty.
Pipework
The sizes of the flow and return pipes from the boiler should
be determined by normal methods according to the
requirements of the system (BS 5449).
It is recommended that the system is designed for an
11ºC (20ºF) drop in temperature across the system.
In systems using non-metallic pipework it is necessary to
use copper pipe for the boiler Flow and Return. The copper
must extend at least 1 metre from the boiler and include any
branches. The copper pipe must not be insulated (Fig. 1).