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P/N 42-9534 8/08 Copyright 2008 Hydrotherm
KN-SERIES GAS-FIRED DIRECT VENT CAST IRON BOILERS – CONTROL MANUAL
Boiler operation and status display
7
Starting the system
Follow the Boiler manual
— Install the boilers
according to the
KN
Series Gas Boiler Installation
& Operating Instructions
manual before
att empting to set up the control system. Perform the
start-up and adjustment procedures in the manual
before proceeding. Failure to comply could result in
severe personal injury, death or substantial property
damage.
FAULTS
— Clear any faults that appear on the
display and make sure to correct the cause before
proceeding. You can silence the alarm by applying
a jumper across J10B SPARE terminals.
Place the LOCAL/REMOTE switch on the MASTER
boiler (or stand-alone boiler) to LOCAL.
Place MEMBER boiler LOCAL/REMOTE switches to
REMOTE.
Start the MASTER boiler fi rst. Turn the MASTER boiler
ON/OFF switch to ON.
Th e HeatNet control will initialize and show the standby
screen unless there is a call for heat.
Start a call for heat. As soon as the control receives a call for
heat, it will show the setpoint temperature bar, as below:
R U N
%
5 0
B L R S
F I R I N G
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1 - - - - - - -
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Th e graphic below explains the temperature bar. You will
see the header or supply temperature change as boilers add
heat to the system or demand changes.
1.
2.
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4.
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6.
Th e upper left of the display will show boiler condition
(prepurge, etc.) as the boiler begins its cycle. Aft er the boiler
begins fi ring, the screen will show RUN % as above.
Aft er the ADD BOILER DELAY time has elapsed, the next
boiler will fi re. Th e MASTER boiler display will show the
START and STOP times. Th e START time counts down
on the display. When the next boiler starts, a 2 will shown
in the BLRS FIRING list. If this doesn’t happen, the water
temperature may have entered the HEAT BAND, so no ad-
ditional heat is needed.
Watch the temperature response as boilers are added. Th e
HeatNet control will att empt to bring the controlled tem-
perature to the setpoint by modulating boilers to meet the
demand.
If temperature tends to overshoot too much, adjust the
ADD BOILER DELAY, STOP BOILER DELAY, and
MODULATE DELAY sett ings in the ADVANCED SET-
UP menu to adapt behavior to the system.
Member boiler displays will show RUN % in the upper left
of the display.
Th e AA terminals are the high fi re override. If
closed on a MEMBER boiler, the boiler runs
independently of the MASTER, because AA takes
priority. If AA is closed on the MASTER boiler, the
HeatNet network shuts down, and only the master
boiler fi res (at high fi re). If using a diverter valve
for a DHW tank, it is recommended that you use
a MEMBER boiler, activated with its AA terminals.
Th is way, the HeatNet and heating loop will still be
under control.
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