TROUBLESHOOTING
HeatNet Control REV 1.38-1
Page 61
Troubleshooting
This section is included as an aide to help troubleshoot
problems with the setup and operation of the boiler. See
Appendix A
for additional fault messages.
Situation:
Nothing happens when the power switch is turned
on.
1.
Check For 120 VAC on the Service connector J1. Verify
the line power is connected as per wiring diagram. The
Power switch light (ON - Position) should illuminate if
this is wired correctly. If the light does not illuminate on
the power switch, ensure that J14 is connected to the main
board and the power switch.
2.
If the Ignition Control is active, but the front panel display
is inactive check:
a.
Cable and cable polarity from the control board to the
display.
b.
J14 on control board. 120vac is routed from here to
the transformer. The transformer returns 24vac to
power the control.
c.
Check for 120vac on the primary of the transformer
and 24vac on the secondary. If one of the 24vac
interlocks has been shorted to ground or the 24vac
output is low, the transformer may be damaged or a
24vac circuit may be miss-wired.
The H-Net control is equipped with resettable
fuses on the power input circuit. Wiring power
incorrectly to the unit will cause these fuses to
open. Once the incorrect wiring is corrected,
the fuses should reset themselves in less than 5
minutes.
Situation:
You get the error message for the Combustion Air
Damper.
1.
The prove switch for the combustion air damper is not
closing. Check to make sure the dampers are being
controlled by the output relay. Also check to make sure
the prove switch is wired and working properly.
2.
If you are not using the combustion air damper then it
needs to be disabled in the AUX FUNCTIONS menu.
Situation:
The display is displaying random characters or the
control keeps resetting.
There may exist a grounding problem with the controller or
one of the boilers, pumps, contactors or other devices
connected to it. If all grounding is correct, there may be an
issue with radiated or induced electrical noise (interference).
This may be caused by, arcing across a contactor's contacts
when starting a pump motor, or a large electrical load. It may
also be caused by, the ignition transformer being improperly
grounded, or the spark gap set incorrectly.
1.
Attempt to identify the noise source:
2.
What is the boiler/controller trying to do at the time of the
failure?
3.
Is the boiler on the same circuit as the noise source? (the
boiler should have isolated power.)
4.
Are shielded sensor wires used? (Ensure the shields are
grounded only at the boiler control end.)
5.
Are any sensors or sensor wires located near a
transmitting antenna? (Move sensor)
Situation:
There are no heating boilers on.
1.
Check the settings for WWS SETPOINT, WARM
WEATHER SHUTDOWN; if the outdoor air temperature
is above the WWS SETPOINT and WARM WEATHER
SHUTDOWN is set to YES, the circulator pump relay
will be locked out and the heating boilers will not fire.
Figure 10
f the water temperature is within the heating band around
the setpoint, boilers will not come on. The water
temperature must fall below the lower band limit to begin
firing boilers.
Situation:
Unable to change the # of Boilers in the BOILERS
menu.
1.
In H-Net method, the Smith-Series control auto-detects
the boilers in the system and adjusts the # of boilers
accordingly.
2.
Using H-NET, if the # of Boilers is not being adjusted
properly to the actual amount of boilers in the system,
check each boiler. There can only be (1) master boiler, but
there can be up to 15 member boilers. Currently, a total of
16 boilers in a system.
