TROUBLESHOOTING
HeatNet Control V3 2.x
Page 86
Situation:
The boilers menu only indicates 1 boiler, but there
are member boilers connected and the amber light
blinks on all of the boilers communication’s jacks.
1.
Ensure that the latest version of firmware is installed on
all boilers. All boilers in a system must have the same
firmware revision.
2.
Ensure the proper termination is set on the Master and
the last Member boiler.
Situation:
You get the error message
– WATER FLOW
SWITCH or WAITING FOR FLOW.
1.
If the control does not sense a closed circuit at input
connection, WTR FLW. Check to make sure the circuit
for the circulator pump is correct, that the pump is
being energized, and that the flow prove switch is
working properly.
2.
If there is no flow prove switch, check to make sure that
a jumper wire has been hooked up to J11B, WTR FLW
interlock.
Situation:
H-Net boilers are detected but then lost and then
detected again etc...
1.
The H-Net communications cable may be receiving
interference from the blower, ignition, or other form of
radiated electrical noise. Termination of the jumpers
may not be correct or there is more than one master.
a.
Ensure that the termination jumpers are set on the
MASTER boiler and only the LAST MEMBER
boiler. All of the other member boilers should have
their termination jumpers in the non-terminated
position.
b.
There may be (2) or more MASTER boilers.
Ensure that only one header sensor is present and
connected to the SYS/DHW input. There should be
no wires or sensors connected to the SYS/DHW
input if the boiler is operating as a member. This
input is auto detected and defines the boiler as a
MASTER.
c.
Ensure the cable to connect the H-Net is of a
shielded or twisted pair type. Shielding of the cable
is required.
d.
Minimize the electrical interference by routing the
communications cable away from electrical noise
sources, such as: Motors, ignition controls,
contactors etc…
Situation:
Only the MASTER boiler Fires, but the system has
many boilers and is using H-Net.
1.
In order for the MASTER boiler to act as a MASTER,
the header sensor must be set to TYPEZ, and there must
be a header sensor present. At power-up, the header
sensor is auto detected. If the temperature of the header
sensor at power-up is greater than –25 F and less than
240 F it is considered a valid sensor. The boiler will
default to the MEMBER mode if the temperature is not
in this range and can only be run locally or by external
inputs.
a.
If the LOAD FACTORY DEFAULTS has been
used to restore all the default settings, the header
sensor has been set to NONE. This needs to be set
as stated in 1, and the header sensor will need to be
replaced or the temperature brought into a valid
range. A power cycle of the boiler will detect the
sensor if it is in the range as stated in 1.).
b.
The H-Net needs a communications cable daisy-
chained between boilers. Ensure that a good
connection is made on the communications board
and that the lights on the dual RJ45 jack flash
(roughly twice a second). The MASTER is the only
one that should flash with no communications
cables plugged in.
Situation:
I am in CALIBRATE and I cannot fire the boiler to
adjust it.
1.
Only one, but any one of the T1-T2 inputs can be used
to start the boiler. All other inputs are disabled. This
method prevents an external control or Building
Management System from trying to control the boiler
while it is offline and being calibrated. If the boiler is
being used as a staged boiler controlled by an external
control, the staged inputs need to be disconnected
before CALIBRATION, since more than one of the T
inputs may be closed by the external control.
Summary of Contents for HeaetNet V3 KN-10
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