Riello Vokera Linea ONE Installation & Servicing Instructions Manual page 8

1 - VARIABLE SPEED CIRCULATION UNIT WITH PROPOR-
TIONAL 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 PROPOR-
TIONAL 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
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
PUMP AREA
3,4
3,2
MODULATION
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
Plant flow rate (l/h)
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
∆T 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 circula-
tion 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 replace-
ment), 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).
6
500 600 700 800 900 1000 1100
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
WITHOUT 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
(TERMOREGULATION)
1200
EXTERNAL SENSOR NO
(NO TERMOREGULATION)
∆T constant
PROPORTIONAL
(2
(P90 = 41)
PROPORTIONAL
PROPORTIONAL
(P90 = 41)
(P90 = 41)
PROPORTIONAL
PROPORTIONAL
(P90 = 41)
(P90 = 41)
≤ ≤
P90 40)