TROUBLESHOOTING
HeatNet Control V3 2.x
Page 87
Situation:
You have forgotten the password.
2.
As a last resort, you can turn the controller off, then
depress and hold the ESC key while turning it back on.
This will load the default password ―AAAAAA‖.
Situation:
Firmware update program starts to load, but then
stops, or does not load at all.
1.
Check that the termination shunts J3 and J6 are not in
the termination setting. If they are, remove them
temporarily while updating. Restore them for proper
communication with a building management system.
2.
Ensure that the USB driver for your PC/Laptop
computer is properly installed.
3.
Disconnect BMS or Protocessor Module if connected.
Situation:
All HeatNet Boilers fire at the same time.
1.
This is usually caused by the HeatNet addresses on the
Member boilers not being set. If the address on each
boiler is not set, then all boilers will have address = 2
by default. When the Master boiler calls to fire boiler
#2, all boilers with address #2 will fire. Set each
Member boiler to a unique address from 2-16.
2.
Check the ADD Boiler delay time to ensure it is at a
reasonable value. A setting of 0 will start all the boilers
at the same time.
Situation:
The boiler is showing that it is running at 45% and
there is no fire in the sight glass.
1.
The Boiler always shows it‘s called for firing
modulation %. This is not an indication of what the
boiler is actually firing at. If the ignition control fails to
receive a call to fire (last interlock closed on terminal 6
of the ignition control) the display will indicate the
called for %. Check if the ignition control is in standby,
if so then the HeatNet control has closed the Start
contact on J5.10 (Limits) and is waiting for the Blower
relay to close on the ignition control which is monitored
on J5.3 of the HeatNet control.
Situation:
I can hear the blower ramping up and down and
the firing rate is changing, but the display
indicates it is running at the same modulation rate.
1.
The Boiler always shows it‘s called for firing
modulation %. This is not an indication of what the
boiler is actually firing at. In this case, the boiler is
trying to meet the called for modulation % which is
displayed, but is unable to do so. The boiler protects
itself by looking at it‘s supply water temperature and
the temperature is probably in the Operating Limit
Band. While in the operating limit band, the HeatNet
control limits the input of the boiler. The boiler tries to
deliver the most input it can in an attempt to meet the
called for modulation % without tripping the operating
limit.
2.
If the boiler is constantly varying in blower speed and
in the operating limit band there may be not enough
flow through the boiler or the Operating
Limit/Operating Limit Band may be improperly set.
The Operating Limit/Operating Limit Band should not
overlap the heating band. This may occur when a
building management system is controlling the setpoint
and is setting the setpoint in the operating limit band.
3.
Example: Setpoint set to 180F (by Building
Management) and the Operating Limit is set to 200F
with a 20F Operating Limit Band. When the boiler is
trying to deliver 180F to the load it‘s supply
temperature would be a minimum of 180F. The
beginning of the Operating Limit Band (looks at supply
temp) would be 200F-20F = 180F. Now, when the
Master is trying to maintain setpoint at 180F, the boiler
is trying to reduce input beginning at 180F at its supply
sensor and as a result, fighting the setpoint. The
Operating Limit band needs to be reduced in this case,
while taking into account the Heat Band differential.
Situation:
The Master boiler sees all of the Member boilers in
the system, but does not fire any of the Members.
1.
If the Master modulates to 100% without firing a
Member boiler and the Member boilers are seen by the
Master (in menu SETUP:BOILERS), then the Member
boilers are sending back offline status to the Master.
a.
The Member boilers may have an alarm or error
condition which would be indicated by a blinking
boiler # in the Boilers Firing screen.
b.
Ensure the HeatNet is set up properly: Amber
lights blink on HeatNet Jacks. Only one Master
boiler.
Содержание HeaetNet V3 KN-10
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