17
To prevent this problem it is necessary to
use the pipes with an “oxygen proof barrier”,
in accordance with standard DIN4726/4729.
If pipes of this kind are not used, keep
the system separate by installing heating
exchangers of those with a specific system
water treatment.
IMPORTANT
Failure to carry out the water treatment
procedure will invalidate the appliance
guarantee.
System controls
The boiler is electrically controlled and is
compatible with most modern electronic time
and temperature controls. The addition of
such external controls can be beneficial to the
efficient operation of the system. The boiler
connections for external controls are 12V
DC and so only controls of 12V DC that have
voltage free contacts should be used.
ROC supply a range wire and wireless system
controls, please contact your supplier for more
information.
Installation position
The boiler can be installed on any suitable
internal wall (sound proofing may be required
when installing onto a stud partition wall).
Provision must be made to allow for the
correct routing of the flue and sighting of
terminals to allow the safe and efficient
removal of the flue products. A compartment
or cupboard may be used provided that it
has been built or modified for this purpose.
It is not necessary to provide permanent
ventilation for cooling purposes. Detailed
recommendations are given in BS 5440 Part
2. If it is proposed that it is to be installed in a
timber framed building then reference should
be made to IGEM Document, IGE/UP/7 or
advice sought from Gas Safe.
When a room sealed appliance is installed
in a room containing a bath or shower,
the appliance and any electrical switch or
appliance control, utilizing mains electricity
should be situated specifically in accordance
with current IEE Wiring regulations.
For unusual locations, special procedures
may be necessary. BS6798 gives detailed
guidance on this aspect.
Condensate Discharge
The condensate discharge hose from the
boiler must have a continuous fall of 2.5°
and must be inserted by at least 50mm into a
suitable acid resistant pipe –e.g. plastic waste
or overflow pipe. The condensate discharge
pipe must have a minimum diameter 22mm,
must have a continuous fall and preferably be
installed and terminated to prevent freezing.
The discharge pipe must be terminated in a
suitable position:
i) Connecting into an internal soil stack (at
least 450mm above the invert of stack). A trap
giving a water seal of at least 75mm must
be incorporated into the pipe run, there also
must be an air beak upstream of trap.
ii) Connecting into the waste system of
building such as a washing machine or sink
trap. The connection must be upstream of
the washing machine/sink. If the connection
is downstream of the waste trap then an
additional trap giving a minimum water seal of
75mm and an air break must be incorporated
in the pipe run, as above.