Sime C Series - Systems I5;I6: Cascade Operation of 2;3 Boilers with External

90
3.5.3 Setting parameters
Set the parameters as shown in the table to ensure that the con-
troller recognises the system, on both the MASTER (parameter
140=1) and the SLAVES (parameter 140=2,3).
MASTER:
System identification.
– Setting mode = INSTALLER
(refer to section on parameter setting levels)
– Setting mode = MANUFACTURER
(Refer to section on parameter setting levels)
SLAVE 1:
System identification.
– Setting mode = USER
(refer to section on parameter setting levels)
– Setting mode = INSTALLER
(refer to section on parameter setting levels)
– Setting mode = MANUFACTURER
(Refer to section on parameter setting levels)
SLAVE 2 (applies to third boiler only):
ISystem identification
– Setting mode = USER
(refer to section on parameter setting levels )
– Setting mode = INSTALLER
(refer to section on parameter setting levels)
– - Setting mode = MANUFACTURER
(Refer to section on parameter setting levels )
3.5.4 Checking for correct recognition
To check that the controller has correctly recognised the type of
system on the basis of the parameters entered, display the installer
parameter in row 53.
For the MASTER, system n. 9 should appear; for SLAVES 1 and 2,
system n. 9.
3.5.5 Minimum return thermostat
The thermostat on the return is not supplied with the probe kit. It ser-
ves to prevent water from being drawn when the temperature in the
circuit upstream of the hydraulic separator is low. It should be set to
35°C.
NOTA: Once parameters have been set, the RVA 43.222SLAVE
leds will all be off.
During regular operation, the MASTER led will be off, and will
flash when not required by the room thermostat.
This is NOT a fault signal.
3.6 SYSTEMS I5/I6: CASCADE OPERATION OF
2/3 BOILERS WITH EXTERNAL HOT
WATER TANK AND ZONE VALVES/PUMPS
The features of this type of system may be summed up as follows:
– Operation of 2/3 boilers in cascade
– Step power modulation of the entire cascade with automatic inclu-
sion and exclusion of individual units
– Automatic adaptation to demand for heat
– Maintaining minimum boiler temperature
– Automatic rotation of boiler sequences
– Automatic summer/winter switchover
– Climate control with outdoor temperature probe
– Boiler works only on demand from at least one room thermostat
– System pump works only on demand from at least one room ther-
mostat
– Weekly heating programming
– Weekly hot water programming.
The components included in the boiler kit to be purchased are
as follows (the outdoor temperature probe QAC31, the 2
cascade delivery/return probes QAD21 and the hot water
tank probe QAZ21 are sold separately):
In this case the MASTER (par. 140 = 1) is connected to the cascade
delivery probe and SLAVE 1 (par. 140 = 2) is connected to the casca-
de return probe.
NB: Relays for management of demand for heating in various areas,
shown in the wiring diagrams, are not included in the cascade mana-
gement kit supplied.
Par Description Default values Setup
90 Minimum limitation of boiler temperature 8 40
91* Type of burner 1 0
95 Pump function output Q1 1 6
140 LPB device address 1 1
170 Input H1 0 1
173 Operating action of contact H1 1 0
* For single stage boilers only
Par Description Default values Setup
90 Minimum limitation of boiler temperature 8 40
91* Type of burner 1 0
95 Pump function output Q1 1 6
96 Use sensor input B10/70/B4 0 1
140 LPB device address 1 2
148 Clock mode 3 2
* For single stage boilers only
Par Description Default values Setup
90 Minimum limitation of boiler temperature 8 40
91* Type of burner 1 0
95 Pump function output Q1 1 6
140 LPB device address 1 3
148 Clock mode 3 2
* For single stage boilers only
Par Description Default values Setup
9 Operating mode of boiler 2 1
Par Description Default values Setup
9 Operating mode of boiler 2 1
Par Description Default values Setup
9 Operating mode of boiler 2 1
Par Description Master Slave 1 Slave 2
53 Display of plant type 99 9
Par Description Default values Setup
17 Slope of heating curve 15 –.––
Par Description Default values Setup
17 Slope of heating curve 15 –.––
Code Description Quantity
RVA43.222 Control unit 1
QAZ21 (immersion) Boiler delivery probe 1