10
4.
External termination of condensate drainage pipe via
condensate siphon
A
IR
R
ELEASE
P
OINTS
:
These must be fitted at all high points where air naturally
collects and must be sited to facilitate complete filling of the
system.
The appliance has an integral sealed expansion vessel to
accommodate the increase of water value when the system is
heated.
It can accept up to 7 l (1.5 gal) of expansion water. If the
heating circuit has an unusually high water content, calculate
the total expansion and add an additional sealed expansion
vessel with adequate capacity.
M
AINS
W
ATER
F
EED
- C
ENTRAL
H
EATING
:
There must be no direct connection to the mains water supply
even through a non-return valve, without the approval of the
Local Water Authority.
F
ILLING
:
A method for initially filling the heating system is supplied with
the connection kit. The filling loop is connected between the
cold water inlet and the central heating flow connections, and
incorporates a non-return valve. To operate the filling loop, it
is necessary to open both quarter turn handles, once the
required pressure has been achieved, close both handles
and disconnect the hose in accordance with water
regulations. N
OTE
: The installer should ensure that there are
no leaks as frequent filling of the heating system can lead to
premature scaling of the main exchanger and failure of
hydraulic components.
D
OMESTIC
W
ATER
The domestic water must be in accordance with the relevant
recommendation of BS 5546:1990. Copper tubing to BS EN
1057:1996 is recommended for water carrying pipe work and
must be used for pipe work carrying drinking water, a scale
reducer should also be used to reduce the risk of scale
forming in the domestic side of the heat exchanger.
U
NDER
F
LOOR
H
EATING
S
YSTEMS
:
In the event of an under floor heating system, fit a safety
thermostat on the boiler flow (instructions for wiring the
thermostat to connection
SP
on the PCB can be found in
Section 2.12). This thermostat should be positioned at a safe
distance from the boiler to ensure the correct operation of the
same. If the thermostat is positioned too close to the boiler, the
water remaining in the boiler after domestic hot water has been
drawn will flow into the central heating system and may cause
the thermostat contact to open without there being any real
danger of the system being damaged, this would lead to a
boiler shutdown both in D.H.W. mode and C.H. mode, and the
error code
“E08”
would be displayed; boiler operation resumes
automatically when the thermostat contact closes on cooling.
Should the thermostat fail to be installed as recommended, the
under floor heating system can be protected by installing a
thermostatic valve upstream from the thermostat in order to
prevent the flow of excessively hot water towards the system.
W
ATER
T
REATMENT
The boiler is equipped with a stainless steel heat exchanger.
The detailed recommendations for water treatment are given
in BS 7593:1992 (Treatment of water in domestic hot water
central heating systems); the following notes are given for
general guidance;
If the boiler is installed on an existing system, any
unsuitable additives must be removed.
Under no circumstances should the boiler be fired before the
system has been thoroughly flushed; the flushing procedure
must be in line with BS7593:1992.
We highly recommend the use of a flushing detergent
appropriate for the metals used in the circuit. These include
cleansers produced by Fernox and BetzDearborn, whose
Summary of Contents for ACO 35 MFFI
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Page 69: ...69 11 BENCHMARK COMMISSIONING CHECKLIST ...
Page 70: ...70 12 SERVICE INTERVAL RECORD ...
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