DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3
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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.
There are (2) channels that may be configured for 4-20 mA inputs or
0-10VDC inputs. They are labeled 4-20 mA (1) and 4-20 mA (2).
The 4-20 mA (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 4-20 mA (2) is a dedicated input used for metered input such as:
Flow meters, etc.
Type of input to use for the ANALOG IN CHANNEL selected
above. The input may be changed from 4-20 mA to 0-10 VDC. The
dip switch S6 also needs to be set correctly in conjunction with this
setting.
When using 4-20 mA 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 4 mA –20 mA and example default of: 50-220F
20 mA SETPOINT
or
10 V SETPT
This is the setpoint temperature when a 20 mA or a 10 VDC signal is
applied.
3.71 - 5.0 mA
Or
.01 - 2.50 VDC
This is the current value which will start the boiler. There is a .1 mA
or .25 VDC hysteresis value. So if the Boiler starts at 4.11mA it
shuts off a 4.01 mA.
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 4-20
mA 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.
Provides a limited access for security, though restoring system
defaults will reset the password to the value “AAAAAA”
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