CTRLMax Manual

58
CHAPTER 8
CHAPTER 8 - CASCADE
8.4.5 Line Voltage Wiring Connections
• Circulator Wiring - Reference Figures 22, 24
and 26 on pages 58, 60 and 62 for circulator wir-
ing required for each type of Cascade System.
The circulator connections used will depend
on the systems piping layout. All circulators are
powered from a common 5A fuse located on
the control module. The total combined amp
draw of the all circulators must not exceed 5
amps at any time. Use an isolation relay to low-
er the total combined amp draw if exceeding
this limits.
• Power Supply – A dedicated 120 VAC / 15A
minimum service must be used to power the
boilers in the Cascade System. Multiple boilers
in the Cascade System can be placed on the
same electrical circuit. Each boiler can draw a
maximum of 8 amps.
• Alarm Wiring – The alarm contact closes when-
ever that particular boiler is in a condition set by
the Error Relay Setting. The alarm contact will
also close on the Master boiler when any of the
Slave boilers are locked in a condition set by the
Error Relay setting.
8.4.6 Cascade Autodetection
The Cascade System must be congured after wiring is
completed and any required adjustments are made in
Cascade Settings. The Cascade Autodetection function
automatically nds and congures all boilers in the Cas-
cade System. This eliminates the need to manually con-
gure each boiler of the Cascade System. Select Cascade
Autodetection on the Master boiler then follow the on-
screen instructions to perform Cascade Autodetection.
Once Cascade Autodetection is nished, a message will
be displayed indicating how many boilers have been
found. If the number of boilers found is correct, press OK
to nish Cascade Autodetection. If the number of boilers
found is not correct, check the cascade communication
cables between the boilers and repeat Cascade Autode-
tection. See navigation on next page.
8.4.7 Lockouts
If a lockout occurs to a boiler in a Cascade System, it
will be removed from Cascade System operation. The
remainder of the Cascade System continues to oper-
ate and the next available boiler will re if necessary.
The Lockout Screen will be displayed on the locked
out boiler as well as the Master boiler. The Master boil-
er Lockout Screen will also indicate which boiler in the
Cascade System is locked out. See Fig. 20 below.
Fig. 26 - Lockouts in a cascade
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