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P/N 42-9472 Copyright 2008 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Control manual
1 Method 1: SmartCycle modulation – control. . .page 6
Th e 200i SmartCycle control can control up to (16) 200i boilers using built-in soft ware
and hardware.
Install a RS485 interface on each boiler and connect with RJ45 SmartCycle cables
(or shielded wires).
Th e header water temperature setpoint can be set by the master boiler or by a 4-20ma
input from an external controller.
Member boilers can override master boiler control if they receive a contact closure on
the Heat Demand or DHW Demand terminals.
2 Method 2: SmartCycle modulation – BMS . . page 14
Th is method uses the 200i control’s built-in communications capabilities to accept
Modbus protocol inputs from a building management system. Th
e master boiler con-
trol sequences and modulates the boiler network to accomplish the demands from the
building management system.
Each boiler requires the RS485 interface board and cable.
Boiler setup is essentially the same as for method 1, with the exception that each boiler
must be assigned both a SmartCycle network address and an address for the Modbus
interface.
An additional bus is required to interface with systems using BACnet or LonWorks protocol.
Th e master boiler will take control and regulate the boiler network if signal from the
BMS is lost or times out.
3 Method 3: External 4-20ma control . . . . . .page 16
Up to 5 boilers can be controlled by an external control that provides a 4-20ma input
signal. Th e external controls must also activate each boiler by closing a contact across
the boiler’s 4-20ma Remote Enable contacts.
Member boilers can override external boiler control if they receive a contact closure on
the Heat Demand or DHW Demand terminals.
4 Control menus and adjustments . . . . . . . . .page 22
Operating parameters and control behaviors are set using the 200i control’s display/
keypad interface.
Refer to this section for the menu structure and explanations of the sett ing options.
5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .page 31
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Contents
200
i
SmartCycle
Control panel
