12
Instruction for the installer
3.7 - WATER CONNECTIONS
WARNING!
Before connecting the water heater to the
water supply and distribution system we
recommend that the system is flushed out
with a product suitable for human use in
order to eliminate any metallic tooling or
brazing residues, oil and grime which could
reach the exchanger and affect the proper
running of the water heater.
Non-observance of these instructions
could cause injury to persons, animals or
damage to property. The manufacturer
shall not be held liable for any such injury
and/or damage.
The hot water distribution pipe and the cold water supply pipe
have to be connected to the relevant 1/2” connections
C
and
F
as shown on page
11.
It is suggested to fit a gate valve at the inlet of cold water.
As a safety measure against gas leaks,
Unical recommends installing a surveillance
and protective system composed of a gas
leakage detector combined with an on-off
selenoid valve fitted on the gas supply line.
.
The gas supply pipe must have a section which is identical
or greater then the one used on the boiler and must assure
a correct gas pressure.
It is however important to comply with the National or Local
Installation Standards.
Before commissioning an internal gas distribution system
and therefore before connecting it to the gas meter, the
complete installation must be tested for gas soundness.
If any part of the system is concealed from view the gas
soundness test must be carried out before covering the
pipes.
Before connecting the pipework the system must be tested
with air or inert gas at a pressure of at least 100mbar.
Before commissioning the boiler ensure that the following
operations are carried out:
- Open the gas meter cock and vent the air contained in the
piping and subsequently proceed to vent device by device.
- Check, with the gas cock turned off, that there are no gas
leaks. During the 2
nd
quarter of the hour from the start of the
test, no pressure reduction should be detected by the
pressure gauge. Any gas leaks must be found by using only
water soap solutions, or an equivalent product, and
eliminated.
Never look for gas leaks using a naked flame
.
3.6 - GAS CONNECTION
DANGER!
The gas connection must be carried out
only by a qualified engineer who will have
to respect and comply to the regulations in
force and to the requirements indicated by
the local gas supplier. An incorrect
installation could cause injury to persons,
animals or damage to property. The
manufacturer shall not be held liable for
any injury and/or damage.
Before installing the boiler it is
recommended to thoroughly clean all the
fuel feed pipework in order to remove any
eventual residual grime which could
compromise the boilers correct
functioning.
If you smell gas:
a. Do not turn on or off electrical switches,
use the telephone or any other object
which can provoke sparks;
b. Open all doors and windows in order to
allow fresh air to enter and purify the room;
c. Close all gas cocks;
d. Contact a service engineer, qualified
installer or the gas supply company.
The water supply pressure has to be within 1
and 4 bar. In case of pressure higher than 5 bar
we suggest to fit a pressure reducing valve.
WARNING!
The hardness of the feeding water conditions
the descaling frequency of D.H.W. heat
exchanger.
Depending on the hardness of the feeding wa-
ter it must be taken into consideration the ins-
tallation possibility of dosing devices of pro-
ducts for human use for the treatment of the
domestic water.
When the water hardness is higher than 15°f
the water treatment is always suggested.
Ascertain that the water pipes are not used as
earthing of the electrical or thelephon installa-
tions. They are not absolutely suitable for this
use. In a short time this could cause serious
damage to the piping and to the water heater.
