HydroTherm HeatNet KN -6 User Information page 71

DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS
SETPT TIME
FACTORY CAL?
FACTORY RESET?
CONFIG ?
ACCELERATE
DECELERATE
SOFT START SECS:
FLOWMETER
GLYCOL MIX
INPUT TYPE
1 minute 1-240 minutes
LOAD DEFAULTS
NO
SAVE SAVE, RESTORE
BLOWER SETTINGS (Ametek Blower)
.1 – 10.0 %/s
3.0%/s
.1 – 8.0 %/s
3.0%/s
2 – 4 seconds
2
NO YES, NO
0% 0-100%
VOLTS (2), mA (2),
VOLTS 2
BMS,
update of its value to keep from timing out and returning control to
H-Net control. If set to ―OFF‖, MODBUS always has control and on
a loss of MODBUS communications, H-Net does not assume
control.
This time is used to automatically reset the SETPOINT TIMER
when any Modbus value is written. If it is set to 1 minute, a periodic
write to one of the registers must occur within 1 minute otherwise
the BMS Setpoint will revert back to the System/Local setpoint.
Selecting YES will load just the factory calibration values: MIN
VFD, MAX VFD and IGN VFD.
Selecting YES will load all factory defaults except the Calibration
values, HeatNet, Modbus addresses, and personality profiles for the
boiler type.
Selecting SAVE will save all of the current settings in this table into
a permanent memory location on the HeatNet control. This should
be done prior to upgrading new firmware or when a job has been
commissioned.
Selecting RESTORE will restore all of the saved settings from the
permanent memory location to this table.
If a signal is sent to increase the blower rpm, the blower's
acceleration speed will change at this rate until it's rpm is equal to
the signal sent. % per second. Setting this value too high may cause
overshooting of the blower rpm and temporarily over firing of the
boiler. Setting this too low will slow down the response of the boiler
If a signal is sent to decrease the blower rpm, the blower's
deceleration speed will change at this rate until it's rpm is equal to
the signal sent. % per second. Setting this value too low will slow
down the response of the boiler to get to setpoint. Setting this value
too high may cause undershooting of the blower rpm and
temporarily dropping below low fire of the boiler (Due to this
condition, the deceleration rate is automatically decreased as the
In order to start the Ametek blower, the control signal must be
applied to start the blower at a low rpm. If the low speed start time
is too low the Ametek blower may not start and lock out with its
current limit. This may result in the need for the boiler to be
recycled. If this is to be avoided, the Stage 4 relay may need to be
wired to the Ametek Blower's contactor. Doing this will allow (3)
attempts to restart the blower every 10 minutes. If the time is too
high, pre-purge time of the blower is lost.
FLOWMETER
If a flow meter or flow control is to be used, set to YES
Any mix over 10% de-rates the flow by 30% (rule of thumb
method). Example: if the LOWEST FLOW = 50 GPM, HeatNet will
calculate a New Lowest Flow required to be 65 GPM. The
LOWEST FLOW does not need to be changed, but is calculated to
65 GPM and that value is used by HeatNet.
This setting determines where the flow values are originating. If set
to Volts (2), then a Flow meter is providing a 0-10V signal on J10B
4-20mA (2). Ensure that S6 switch 2 is UP for 0-10VDC.
If the setting is mA (2), then a Flow meter is providing a 4-2omA
signal on J10B 4-20mA (2). Ensure that S6 switch 2 is DOWN for
HeatNet Control V3 2.x
to get to setpoint.
rpm approaches low fire).
Page 71