DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS
HeatNet Control V3
Page 109
SENSOR
OUTSIDE, SUPPLY,
RETURN, HEADER,
DHW, STACK,
SYSTEM RETURN
The first (4) sensor #’s are reserved as: OUTSIDE AIR, water
SUPPLY outlet, water RETURN inlet, and system HEADER
temperature. If the HEADER sensor is used (TYPEZ), that boiler
performs the tasks of the MASTER boiler. If the HEADER sensor is
set to NONE, its function is the MEMBER. The next (3) sensors
perform DHW, Stack, and System Return measurements.
There are (4) sensor types:
NONE = does not use this sensor
TYPEZ = 10k thermistor
PT = 1k Platinum (only for Stack temperature)
ON/OFF = 5-volts supplied out to detect a contact/switch closure.
CHANNEL:
1
1
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 0-10VDC. The
dip switch S6 also needs to be set correctly in conjunction with this
setting.
START SETPOINT
50
F
50 - 195 °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 50-220F
20mA SETPOINT
or
10 V SETPT
220
F
50 - 195 °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 - 2.50VDC
This is the current value which will start the boiler. There is a .1mA
or .25VDC hysteresis value. If the Boiler starts at 4.11mA it shuts
off a 4.01mA.
PRIORITY
NORMAL
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.
ENABLED
YES
YES/NO
If a flow meter or flow control is to be used, set to YES
