Variable Speed Circulation Unit - Beretta EXCLUSIVE GREEN HE C.S.I. Installer And User Manual

Cleaning the system and characteristics of heating circuit water
After installing a new system or replacing a boiler, clean the heating system.
To ensure the product works correctly, after cleaning, additivating and/or
chemically treating the system (e.g.: anti-freeze, film-formers, etc.), make sure
the characteristics of the water satisfy the parameters indicated in the table.
Parameters um
PH
Hardness °F
Appearance
If water hardness exceeds 28°Fr, it is recommended to use water softeners,
to prevent any limestone deposit in boiler due to excessively hard water.
PUMP DUTY
Exclusive Green HE boilers are fitted with a variable speed circulation unit
that is already connected up in terms of plumbing and electrics, and the
usable performance it provides is shown in the graph.
The boilers are fitted with an anti-blocking system that starts an operating
cycle every 24 hours when not used, irrespective of the position of the func-
tion selector.
The "anti-blocking" function is only active when the electrical power
supply to the boiler is on.
Operating the circulation system without any water is strictly forbidden.

VARIABLE SPEED CIRCULATION UNIT

The modulating circulating function is only active for the heating function.
When switching the three ways on the plate heat exchanger, the circulation
unit is set at maximum speed. The modulating circulation function applies
only to the boiler circulation unit and not to circulation units on any external
devices connected to it (e.g. booster circulation unit).
Any of 4 operating modes can be chosen, depending on situations and the
type of plant.
By accessing parameter 90 in the technical menu, one of the following pos-
sibilities can be chosen:
1 - VARIABLE SPEED CIRCULATION UNIT WITH PROPORTIONAL MODE
(41 <= P90 <= 90)
2 - VARIABLE SPEED CIRCULATION UNIT WITH CONSTANT DT MODE
(2 <= P90 <= 40)
3 - VARIABLE SPEED CIRCULATION UNIT WITH MAXIMUM FIXED
MAXIMUM SPEED MODE (P90 = 1)
4 – EXCEPTIONAL USE OF A STANDARD CIRCULATION UNIT WITHOUT
SPEED ADJUSTMENT (P90 = 0)
1 - VARIABLE SPEED CIRCULATION UNIT WITH PROPORTIONAL MODE
(41 <= P90 <= 90)
In this mode the boiler's board determines what flow rate curve to adopt
according to the instantaneous power supplied by the boiler.
The boiler controller breaks down the power range within which the boiler
operates in heating mode into various levels. Depending on the power level
in use when heating, one of the speeds available is selected automatically
according to a linear logic: Maximum power = high speed, minimum power
= low speed.
This is used on all types of plants where the machine's power has been
correctly balanced with the plant's real needs.
Operationally:
- Access parameter 90
- Set the parameter = 41
Note: The parameter 90 = 41 setting is recommended by the manufacturer.
Values exceeding 41 are used in specific cases.
2 - VARIABLE SPEED CIRCULATION UNIT WITH CONSTANT DT MODE
(2 <= P90 <= 40)
In this mode the installer sets the ∆T value to be maintained between the
delivery and return (e.g. if a value of 10 is entered, the circulation unit's
speed will change to implement a plant flow rate aimed at maintaining the
∆T between upstream and downstream of the heat exchanger at 10°C).
By periodically sampling the values provided by the boiler delivery/return
sensors, the board increases or decreases the circulation unit's speed and
therefore the plant's flow rate. If the sampling shows a ∆T value lower than
that set, the speed is reduced until the ∆T increases to the value set. Vice-
versa is sampling is higher than the value set, the speed is increased.
This is used for direct high temperature plants (typical of replacement),
where the boiler is not thermostatically controlled, and where a calculated
∆T can be set.
When working with a constant delivery temperature and attainment of
stabilising the ambient conditions, the average temperature of the radiators
tends to increase. By keeping ∆T constant, the reduction in the flow rate is
obtained by changing the operating curve, which produces a lower return
temperature that in turn favours high boiler performance and the reduction
of electricity consumption.
Operationally:
- Access parameter 90
- Set the parameter at a value between 2 and 40 (normally between 10
and 20).
Water in Inlet
heating water
circuit
7÷8
- 15÷20
- limpid
3 - VARIABLE SPEED CIRCULATION UNIT WITH MAXIMUM FIXED
MAXIMUM SPEED MODE (P90 = 1)
In this mode the modulating circulation unit works constantly at maximum
speed.
It is used on plants with a high load loss in which the boiler's head must be
used as much as possible in order to guarantee sufficient circulation (plant
flow rate at maximum speed lower than 600 litres per hour).
This is used when bottles of mixture are involved, with high flow rates in
the circuit downstream.
Operationally:
- Access parameter 90
- Set the parameter = 1
4 – EXCEPTIONAL USE OF A STANDARD CIRCULATION UNIT WITH-
OUT SPEED ADJUSTMENT (P90 = 0)
This mode must be used in exceptional cases in which the boiler is to
be used with a traditional circulation unit without a speed adjustment. It
presupposes that the adjustable speed circulation unit has been removed
and replaced with a non-adjustable speed circulation unit.
Warning !!!! the BE06 board connected to connector CN9 must be removed
and replaced with a connector with a jumper to be inserted into connector
CN9. This latter connection is obligatory and if not formed may cause the
system to malfunction.
Operationally:
- Access parameter 90
- Set the parameter = 0
CONFIGURATIONS RECOMMENDED BY THE MANUFACTURER
EXTERNAL SENSOR YES
(
(HEAT REGULATION)
PROPORTIONAL
(P90 = 41)
PROPORTIONAL
(P90 = 41)
PROPORTIONAL
(P90 = 41)
6,0
5,8
5,6
5,4
5,2
5,0
4,8
4,6
4,4
4,2
4,0
3,8
3,6
3,4
PUMP AREA MODULATION
3,2
3,0
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
0,0
0 100 200 300 400 500
Plant flow rate (l/h)
ENGLISH
EXTERNAL SENSOR NO
) (NO HEAT REGULATION)
∆T constant
(2≤P90≤40)
PROPORTIONAL
(P90 = 41)
PROPORTIONAL
(P90 = 41)
600 700 800 900 1000 1100 1200
5