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P/N 42-9472 Copyright 2008 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Control manual
Method 3: External 4-20ma control
(continued)
3
Figure 13
Wiring the boiler circulator using a circulator
relay (required for motors over 1/4 hp)
Figure 14
Wiring the boiler circulator using a relay or
starter (required for motors over 1/4 hp)
Circulator wiring
Postpurge circulator
The circulator shipped installed with the boiler can-
not be used for system circulation.
It must be used as
supplied from the factory. It circulates water aft er the boiler
stops fi ring to prevent potential damage from heat pocketing
in the top of the heat exchanger.
Th e postpurge circulator is factory-piped and pre-wired. Do
not change the usage, the wiring, the location or the piping.
Boiler circulator
See the Boiler manual for circulator piping.
Figure 13, Figure 14, and Figure 15 show wiring of the Boiler
circulator (or boiler/system circulator) to the terminal strip
of the
200i
electrical connection board.
DO NOT directly connect a circulator with a motor larger
than 1/4 hp. For larger motors, install a circulator relay or
motor contactor . Figure 13 and Figure 14 show the correct
ways to install the boiler circulator using a relay or motor
starter.
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•
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Figure 15
Circulator wiring terminal strip
(see Figure 11,
page 16, for location) — Also see the wiring sum-
mary illustrations on the next pages)
