Instruction manual
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P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
e control’s rmware version number will display. Make sure the 4.
rmware of all boilers is compatible. All boilers in a multiple boiler ap-
plication should preferably have the same rmware version to ensure
consistency. If versions are dierent, all versions must be either version
2.0 or greater, or version 1.x.
Aer the control’s timer nishes, the display will show STANDBY and 5.
SYSTEM. is veries that the master boiler is setup correctly as the
master. e same display will show on member boilers when there is a
call for heat from the master boiler. When there is no call for heat at a
member boiler, the display will show LOCAL instead.
If the master is functioning correctly, the yellow LED’s on the H-Link 6.
jack ports will blink. e blinking indicates that the master is trying to
communicate with member boilers.
If a FAULT message is displayed, clear the faults until the STANDBY 7.
message is displayed. Refer to troubleshooting suggestions in this
manual if you cannot resolve the issue.
Member boiler cables
Begin with the rst member boiler.1.
Plug one end of the RJ45 or shielded cable into the master boiler’s out-2.
put port. Plug the other end of the master boiler’s communications ca-
ble to a member boiler’s input port, using either RJ45 cable or shielded
cable (Figure 3, page 22).
Connect cables to all of the member boilers by cabling from one to the 3.
next.
Check the network
Turn the power on and the on/o switch to ON for all of the member 1.
boilers.
Allow time for each boiler to initialize.2.
Aer about 30 seconds, the master boiler should recognize the mem-3.
ber boilers.
Navigate to the BOILERS menu, then to HEATNET BOILERS dis-4.
play. e master control will show the boilers it recognizes.
If the display shows a blank space, such as “123_56789,” the control 5.
does not detect the missing boiler (boiler 4). Check the yellow LED
on the communication port of the missing boiler.
NORMAL connection — LED should ash steadily, about twice per 6.
second.
TERMINATION incorrect — LED will ash rapidly and stay on.7.
OPEN connection — LED does not ash at all.8.
If a FAULT message is displayed, clear the faults until the STANDBY 9.
message is displayed. Refer to troubleshooting suggestions at the end
of this manual if you cannot resolve the issue.
Start the system
Turn o power to all boilers.1.
Connect all call for heat wiring to the boilers.2.
Turn on power to all boilers and turn the on/o switches to ON.3.
e boilers should now operate normally, as described in the Boiler 4.
manual.
e master boiler will sequence and modulate boilers as necessary to 5.
control the water temperature.
e master boiler will show the number of boilers ring as well as the 6.
temperature and heat band display. Use the UP/DOWN keys to scroll
through the displays to watch the process of starting and stopping boil-
ers.
Multiple boilers: HeatNet modulation (cont.)
2