Gas Conversion - Beretta METEO GREEN HE R.S.I. Installer And User Manual

The ambient thermostat makes a heat request when its contact closes, while
it stops it when its contact opens. Though delivery temperature is automati-
cally calculated by the boiler, the user may manually override it. By modifying
HEATING on the user interface, the HEATING SET POINT will no longer
be available but just a value that can be set from +5 to -5°C as required.
Modifications to this value do not directly change delivery temperature but
affect the calculation made to automatically determine its value by modifying
the reference temperature of the system (0 = 20°C).
For boilers fitted with the S.A.R.A. Function, if the AMBIENT THERMOSTAT
remains closed for a long time, the boiler automatically increases the delivery
temperature which is added to the effect of the temperature control function.
When the AMBIENT THERMOSTAT opens, the boiler automatically returns
to the value determined by the TEMPERATURE CONTROL function.
IF A PROGRAMMABLE TIMER IS CONNECTED TO THE BOILER, SET
PARAMETER 51 = 1 (graph 3)
PARALLEL NIGHT REDUCTION
90
DAY
80
temperature curve
70
60
50
40
30
20
10
20 15 10
EXTERNAL TEMPERATURE (°C)
When the contact is closed, the heat request is made by the delivery probe
on the basis of the external temperature in order to maintain the rated ambi-
ent temperature at the DAY level (20°C). When the contact opens, it does
not stop the heat request but reduces (parallel shift) the temperature curve
to the NIGHT level (16°C). Though delivery temperature is automatically
calculated by the boiler, the user may manually override it.
By modifying HEATING on the user interface, the HEATING SET POINT
will no longer be available but just a value that can be set from +5 to –5°C
as required.
Modifications to this value do not directly change delivery temperature but
affect the calculation made to automatically determine its value by modify-
ing the reference temperature of the system (0 = 20°C for DAY level; 16°C
for NIGHT level).
CONNECT AT/BT
In case of using CONNECT AT/BT, accessory supplied on request, the boiler
gives the possibility to choose 2 thermoregulation curves:
- OTC 1 CH (parameter 45) for a direct system
- OTC 2 CH (parameter 47) for a mixed system.
Even in case of second circuit (2CH) the curve depends on the external
minimum project temperature (on the geographical area, therefore) and on
the delivey project temperature (on the type of system, therefore); the installer
must to put attention to calculate it using the following formula:
P. 47 = 10 x
20- rated min. external T
Parameters 31 and 32 give the possibility to define the maximum and the
minimum central heating set-point of the second circuit.
To correct the curve in this configuration, please refer to the instructions
supplied with the accessory.
GRAPH 3
NIGHT
temperature curve
5 0 -5 -10 -15
rated delivery T - 20

24 - GAS CONVERSION

It is easy to transform gas from one family to gas belonging to another family
even with the boiler installed.
This job must be done by professionally qualified personnel only.
The boiler is supplied to run on natural gas (G20) – see the product rating
plate for details.
The boiler can be transformed to use propane gas using a special kit.
Follow the instructions given here below for disassembly:
- Switch off the power to the boiler and turn off the gas cock
- Remove the panel and casing
- Lift up and rotate the instrument panel
- Open the air box cover
For 25 HE only: unscrew the screws fastening the silencer (A) and remove
it (Fig. 1.16)
- Disconnect the mixer gas ramp. Unscrew the clamp screws and relative
mixer springs to fan and then remove it.
- For HE 35 only: unscrew the screws fixing the plastic Venturi to the alu-
minium shell
- Loosen the plastic Venturi (B) - Fig. 1.16 - by levering from under the teeth
(BE CAREFUL NOT TO FORCE THEM) and press from the opposite side
until it is completely extracted from the aluminium shell.
- Using wrench CH6 remove and DISGARD AND DO NOT RE-USE the 2
nozzles (C), clean plastic debris from relative housing (Fig. 1.17)
- Press in the 2 new nozzles from the kit as far as the threaded part, then
screw in tightly
-20
METEO GREEN HE R.S.I.
- 1.16 -
A
B
- 1.17 -
C
C
33