20
CHAPTER 4
Fig. 10 - 3 Boiler Cascade, 1 System Pump, 1 CH Pump and 1 DHW Pump (Manual Pump Conguraiton)
ZV4
P3
CH
DHW
Sensor
Optional Extra Required: Lead from X15 on 1 boiler to X16 on the next boiler
System
ZV2
ZV1
ZV3
P3 DHW
N G L
Boiler 1 (Master)
Boiler 2 (Slave)
Boiler 3 (Slave)
CH
Main Control Board
Back of Display Panel
Back of Display Panel
Heating Call
From Zone Panel
Out
Outd
door S
oor Se
ensor
nsor
D
DHW S
HW Sen
ensor
sor
Cascade
Master
Cascade
Cascade
S
Syst
yst
em
em S
Sens
ensor
or
Master
Slave
Cascade
Slave
Main Control Board
4 5 6
1 2 3
X15
3 4
1 2
X16
123
X7
4 5 6
1 2 3
X15
3 4
1 2
1
X16
23
X7
CH1CH2
Thermostat ThermostatSensor
System Outdoor
Sensor
ModbusDHW Sensor
or
aquastat
Modulation
Signal
6 5 4 3 2
+
1 4 3 2 1 2 1 1
- G
3 2
-
+
X5 X6 X4 X7
CH1CH2
Thermostat Thermostat
System
Sensor
Outdoor
Sensor
ModbusDHW Sensor
or
aquastat
Modulation
Signal
6 5 4 3 2 4
+
1 3 2 1 2 1 1
-
- G
3 2
+
X5 X6 X4 X7
CH1CH2
Thermostat Thermostat
System
Sensor
Outdoor
Sensor
Modbus
or
DHW Sensor
aquastat
Modulation
6
Signal
5 4 3 2
+
1 4 3 2 1 2 1 1
-
- G
3 2
+
X5 X6 X4 X7
FLAME
SUPPLY CH PUMP
DHW PUMP
L N G L N G L N G L N G
FLAME
SUPPLY CH PUMP
DHW PUMP
L N G L N G L N G L N G
FLAME
SUPPLY CH PUMP
DHW PUMP
L N G L N G L N G L N G
CHAPTER 4 - BOILER PIPING
Optional Extra Required: Lead from X15 on 1 boiler to X16 on the next boiler
System
Sensor
DHW
P3
CH
Main Control Board
Main Control Board
Back of Display Panel
Boiler 3 (Slave)
Boiler 2 (Slave)
Boiler 1 (Master)
P3 CH DHW
Back of Display Panel
Cascade
Slave
Cascade
Slave
Cascade
Master
Cascade
Master