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P/N 42-9472 Copyright 2008 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Control manual
The Mestek
200
i
boiler — SmartCycle
TM
control
200
i
components
Wiring connections
Power wiring, 120 vac
Heat demand input
DHW demand input
Low fi re terminals
High fi re terminals
To boiler outlet water
temperature sensor
To optional outdoor
temperature sensor
To optional boiler return
water temperature sensor
To optional header
temperature sensor
To boiler postpurge pump
(factory piped and wired)
To boiler circulator
Alarm output dry contacts
To external high limit and/or
low water cutoff if desired
To fl ow switch, when used
Used to activate combustion
air damper if desired
To combustion air damper proving
switch, required when controlling
combustion air damper
Indoor air reset inputs — connect
to up to 8 zone thermostats
Optional 20 ma control signal input
Remote enable to start when
operating on 20 ma input
Optional SmartCycle
communications board
Boiler wiring socket to blower
and gas valve
Boiler wiring socket to pressure
switches and Fenwal control
Boiler wiring socket to
control panel
Boiler wiring socket to
control panel
Boiler wiring socket to
power switch
Boiler wiring socket to transformer
Termination DIP switches
1.
2.
3.
4.
5.
6.
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12.
13.
14.
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