DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS
HeatNet Control V3 3.x
Page 118
CHANNEL:
1
1, 2
There are (2) channels that may be configured for 4-20mA inputs or
0-10VDC inputs. They are labeled 4-20mA (1) and 4-20mA (2). The
4-20mA (1) input is used to direct fire a boiler or to remotely control
the setpoint of the boiler. Analog channel (1) is the primary channel
used for direct modulation and remote setpoint control.
The 4-20mA (2) is a dedicated input used for metered input such as:
Flow meters, etc.
MODE:
4-20mA
4-20mA or 0-10VDC
Type of input to use for the ANALOG IN CHANNEL selected
above. The input may be changed from 4-20mA to 0-10 VDC. The
dip switch S6 also needs to be set correctly in conjunction with this
setting.
START SETPOINT
50
°
F
50-220
°
F
When using 4-20mA setpoint control in SETPOINTS: SETPOINT
SOURCE. This is the temperature when a BOILER START signal
(see BOILER START menu below). The Setpoint will then be
mapped from 4mA –20mA and example default of 50-220
°
F
20mA SETPOINT
or
10 V SETPT
220
°
F
50-220
°
F
This is the setpoint temperature when a 20mA or a 10 VDC signal is
applied.
BOILER START
4.11mA
Or
2.04VDC
3.71 - 5.0mA
Or
.01 - 2.50 VDC
This is the current value which will start the boiler. There is a .1mA
or .25 VDC hysteresis value. So, if the Boiler starts at 4.11mA it
shuts off a 4.01mA.
PRIORITY
NORMAL
NORMAL
HIGHEST
If the Priority is set to NORMAL, the boiler responds to its HEAT
DEMAND inputs in the Priority that is outlined in the Control
Methods section. If the Priority is set to HIGHEST, the 4-20mA
input responds at the highest Priority level (same as the AA input).
This method may be used by an external control to override the
HeatNet control and fire the boiler using this external control
(external control override). This allows for complex DHW control
systems where an external control can take over the firing rate for a
DHW call, and direct modulate a boiler.
MODBUS ADDRESS
1
(1
– 247)
The MODBUS address is for communicating with Laptop, PC, or
other MODBUS capable device, such as a Building Management
System. It is the 2nd communication port reserved for host control.
BAUD RATE
19200
1200, 2400,
4800, 9600,
19200, 38400
This is the Baud rate for serial communication from the MODBUS
port. Selectable from 1200, 2400, 4800, 9600, 19200, 38400.
DATA FORMAT
8E1
8E1, 8N1,
8N2, 8O1
8 bits -Even Parity -1 stop bit, valid settings: 8E1, 8N1, 8N2, 8O1
SETPOINT TIMER
ON
ON, OFF
If set to ‘ON”, the setpoint timer is enabled and requires a periodic
update of its value to keep from timing out and returning control to
the
H-Net control. If set to “OFF”, MODBUS always has control and on
a loss of MODBUS communications, H-Net does not assume
control.
SETPT TIME
1 minute
1-240 minutes
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 to the System/Local setpoint.