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Figure 8.52: Interconnection of Cascade Link Wires
Figure 8.53: Switching the Master Switch to the
"ON" position
C A S C A D E
A d d r e s s
B o i l e r
A d d r e s s :
Figure 8.54: Cascade Address Selection
d. Dependent Boiler Designation: Dependent boilers
must have different boiler addresses "2" to "8".
Each dependent boiler must be connected to a
circulating pump. Table 8.11 shows address
selections for Stand-alone, Managing &
Dependent boilers.
BOILER CONTROL: INTERNAL WIRING & OPERATION
S e l e c t
i o n
Table 8.11: Boiler Address Selection Range
Parameter
Boiler Address
e. Cascade Operation: When a call for hot water is
present, either from a thermostat or a by sensing
low tank temperature, the master boiler chooses a
lead boiler based on the Cascade Rotation Interval
(See Below).
• The control starts the lead boiler. After the
start delay time, each boiler in the cascade
system is started in succession.
C A S C A D E
S t a r t
Figure 8.55: Start Delay Time
Table 8.12: Start Delay Time Range
Parameter
Start Delay Time
The default value of this parameter is the
minimum to prevent a long delay before
starting another boiler. If the delay is
0 ▼
significant, it is possible that the tank
temperature will fall before all boilers are in
operation. If many boilers are installed and the
load is highly variable, consider using two
cascade systems. In this case, the tank sensors
for each system can be placed such that the
second group of boilers only comes on if there
is a very large load.
Stand-alone
Managing
(Default)
Boiler
0
1
D e l a y
T i m e :
1 0 s e c ▼
Minimum
Default
10 seconds
10 seconds
Dependent
Boilers
2-8
▲
Maximum
240 seconds
(4 minutes)
41
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