GF-135
Esteem 399 Low NOx Boiler
Chapter 18
OMM-0089_0A
Installation, Operation & Maintenance Manual Controller Operation
Page
150
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
18.7.5 Cascade Installation – Line Voltage Wiring Connections
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Circulator Wiring:
Reference Figures 18-45, 18-47, and 18-49 for circulator wiring required
for each type of Cascade System. The circulator connections used will depend on the
systems piping layout.
NOTE
Each circulator is individually fused with a 2.5A fuse located in the
terminal strip. The total combined amp draw of the CH (1), DHW,
and auxiliary Boiler circulators must not exceed 3 amps at any time
for the Esteem boiler. Use an isolation relay to lower the total
combined amp draw if exceeding these limits.
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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.
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Alarm Wiring:
The alarm contact closes whenever that particular boiler is in a soft or hard
lockout. The alarm contact will also close on the Master boiler when any of the Slave
boilers are locked out.
