13
P/N 42-9452 8/08 Copyright Hydrotherm
KN USER’S CONTROL MANUAL
Figure 10
RS485 communications board
Turn on power to the master boiler and set its on/off switch to ON.
You should hear at least 2 beeps.
Th e control’s fi rmware version number will display.
Aft er the control’s timer fi nishes, the display will
show STANDBY and SYS SET. Th
is verifi es that
the master boiler is setup correctly as the master.
Th 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 LOC SET instead.
If the master is functioning correctly, the yellow LED’s on the H-Link jack ports
will blink. Th 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 message is
displayed. Refer to troubleshooting suggestions at the end of this manual if you
cannot resolve the issue.
Member boiler cables
Begin with the fi rst member boiler.
Plug the other end of the master boiler’s communications cable to the member boiler’s
input port (Figure 10, page 13, item 2 for RJ45 cable or item 4 for 3-wire cable).
Connect cables to all of the member boilers by cabling from one to the next. Connect
incoming cables to item 1 or 4, Figure 10, page 13. Connect outgoing cables to item
2 or 4. (Note that shielded cable wires will share terminals when using item 4.)
Check the network
Turn the power on and the on/off switch to ON for all of the member boilers.
Allow time for each boiler to initialize.
Aft er about 30 seconds, the master boiler should recognize the member boilers.
Navigate to the BOILERS menu, then to HEAT
NET BOILERS display. Th e master control will
show the boilers it recognizes. Values from 10 to
15 will display as lett ers (10=A, 11=B, 12=C, 13=D, 14=E and 15=F).
If the display shows a blank space, such as “123_56789ABC,” the control does not
detect the missing boiler (boiler 4). Check the yellow LED on the communication
port of the missing boiler.
NORMAL connection — LED should fl ash steadily, about twice per second.
TERMINATION incorrect — LED will fl ash rapidly and stay on.
OPEN connection — LED does not fl ash at all.
If a FAULT message is displayed, clear the faults until the STANDBY message is
displayed. Refer to troubleshooting suggestions at the end of this manual if you
cannot resolve the issue.
Start the system
Turn off power to all boilers.
Connect all call for heat wiring to the boilers.
Turn on power to all boilers and turn the on/off switches to ON.
Th e boilers should now operate normally, as described in the Boiler manual.
Th e master boiler will sequence and modulate boilers as necessary to control the
water temperature.
Th e master boiler will show the number of boilers fi ring as well as the temperature
and heat band display. Use the UP/DOWN keys to scroll through the displays to
watch the process of starting and stopping boilers.
2.
3.
4.
5.
6.
7.
1.
2.
3.
1.
2.
3.
4.
5.
6.
7.
8.
9.
1.
2.
3.
4.
5.
6.
RJ45 HeatNet cable IN from master or previous
member
RJ45 HeatNet cable OUT to next member boiler
Shielded wire (3-2ire), option to RJ45 cable, Heat-
Net communications INPUT and connection for
additional boilers on the network
Shielded wire (option to RJ45 cable) Modbus INPUT
from building management system
USB cable port (for USB cable connection to a PC —
required when updating control fi rmware)
RJ45 cable from building management system, when
used
Plug for insertion into KN control electrical connec-
tion panel (see page 3)
NOT SHOWN — An optional plug-in bridge is re-
quired to interface with building management systems
that use BACnet or LonWorks protocol. Th e KN
control supports Modbus protocol with no additional
components except the RS485 interface board.
1.
2.
3.
4.
5.
6.
7.
8.
Method 1: HeatNet modulation – local control
(cont.)
1
