Installation Manual
Wall Hung Boiler with D.H.W. Storage Cylinder Low Nox – Cod. 99881NA – July 2001
9
GAS CONNECTIONS
The gas supply must be connected up by qualified person.
The following standards must be complied with: UNICIG 7131/72 and UNICIG 7129/92 (of 21/04/93)
Before installing the boiler, make sure of the following:
•
the pipeline must be of an adequate section and length to carry the flow required and must be fitted with all safety devices
and measures prescribed by current norms;
•
before turning on the boiler make sure the type of gas which it is designed to run on is available
•
the gas supply pressure must lie within the values shown on the plate it is recommended that the gas supply pipeline should
be checked for residual obstructions before installing the boiler;
•
where the internal gas supply pipe meets the boiler, a gas shutter cock must be fitted which has the same diameter as the
gas inlet pipe;
•
check thoroughly that the gas inlets and outlets are properly sealed.
•
conversion to allow the boiler to run on LPG to natural gas or vice versa must be carried out by a qualified gas fitter in
accordance with law no.46 of 5th March ‘90 (see p.18).
ANTI-FROST SYSTEM
Radiant boilers are equipped with an Anti-Freeze system which comes into operation when the temperature falls to 5° C
(Heating sensor) and 4° C (Hot water sensor) and protects the boiler down to –2°C external temperature.
To protect the internal Radiators, a room thermostat or remote control must be fitted.
NOTE: The frost system will only come into operation if the boiler is filled with water, and connected to a live gas supply, with
electrical supply and boiler controls in the “ON” position (With the Main switch turned to Summer or Winter position)
) and the
gas supply turned on.
FOR THE INSTALLER
For boilers installed outdoors, where the
temperature may drop below -2° degrees
Centigrade, the system should be filled
with antifreeze liquid by an authorised
technician and a set of electrical heating
elements should be fitted to protect the
domestic hot water heat exchanger.
ADVICE FOR THE SERVICE
TECHNICIAN
If the boiler is out of service
because it is frozen, check that
no parts have been locked in
position by ice before putting it
into operation.
It is advisable to empty the
boiler and the system in case of
no operation for a long period.
Recommended percentage of
glycol for temperatures down to
- 8°C is 20%.
The antifreeze
liquid used must be of a good
make and in a solution which
has already been diluted to
avoid the risk of uncontrolled
dilution.
Table n°1
Antifreeze Temperature
Ethylene glycol
(%) volume
freezing point
(°C)
boiling point
(°C)
10 -
4 101
20 -10 102
30 -
17 104
40 -
27 106
50 -
40 109
60 -
47 114
1
2
3
4
5
6
0
1000
500
2000
1500
3000
0
2500
P
re
va
len
za
: m.
c.
a.
Portata: l/h
CIRCULATING PUMP SPECIFICATIONS
Summary of Contents for RMA
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