Instruction manual
4
P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
1 Stand-alone boiler ...................... page 6
Provide an external contact connected across J12A HEAT DEMAND terminals •
to start the boiler. (A MEMBER boiler in a network can also be activated by closing
the circuit across HEAT DEMAND.)
e boiler can operate based on its SUPPLY temperature, or can be operated by re-•
mote control from a 4-20mA source. And setpoint temperature can be controlled
locally or by 4-20mA signal from a remote source.
e boiler’s T1/T2 terminals can be used to operate the boiler as two-stage (red •
at minimum input or maximum input).
e AA terminals can be used to re the boiler as ON/OFF at maximum input.•
2 Multiple boilers: HeatNet modulation ... page 8
e HeatNet control can control up to (16) boilers using built-in soware and •
hardware.
Boilers come standard with HeatNet communications capability, and require only •
RJ45 HeatNet cables (or shielded wires) to connect between them.
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 terminals or the AA high re terminals. In addition, the
controls can be set up to allow priority override by a remote 4-20mA source.
3 Multiple boilers: BMS operation ........ page 13
PREFERRED — • Combined BMS/HeatNet operation — is method uses
the HeatNet control’s built-in communications capabilities to accept MODBUS
protocol inputs from a building management system. e master boiler control
sequences and modulates the boiler network to accomplish the demands from the
building management system.
ALTERNATE — •
Direct BMS control of all boilers — Each boiler can be op-
erated directly by the BMS (each boiler will require an optional plug-in protoces-
sor if using BACnet or LonWorks).
Boiler setup is essentially the same as for method 2, with the exception that each •
boiler must be assigned both a HeatNet network address and an address for the
MODBUS interface.
An optional plug-in protocessor is required to interface with systems using BACnet •
or LonWorks protocol.
e master boiler will take control and regulate the boiler network if signal from •
the BMS is lost or times out.
4 External 4-20ma control ................ page 15
4-20mA/HeatNet combined operation — e master boiler can receive the •
4-20mA modulation signal and control the other boilers.
RBI Futera
III
/XLF/FUSION
-Series boilers — HeatNet
TM
control
Futera
HeatNet
Electrical enclosure