OPTIONAL FEATURES
HeatNet Control V3 2.x
DHW TANK
MEMBER
Thermostat
DHW TANK
MASTER
Thermistor Sensor
Main Heating Loop
LOCAL
LOCAL
DHW
DHW
= Hybrid mode sensor locations.
(Selectible)
Simplified Drawing
When the OR OVR input sees the thermostat close, the
DHW pump/valve will be engaged and remain energized
as long as the OR OVR input sees that the thermostat is
closed. The DHW setpoint along with the DHW heating
band will then be loaded. A steady temperature will now
be maintained using the
HYB SENSOR
setting in the
DHW menu. This sensor will control the water
temperature at the sensor‟s location, enabling or disabling
the boiler as needed until the OR OVR input sees the
thermostat open. Once the thermostat opens, the DHW
pump post purge will begin.
The difference between setting up the
5A
method vs.
5B
method is the “
USE SENSOR”
setting.
5A
requires that
the “
USE SENSOR”
setting
be set to YES, and the
5B
“USE SENSOR”
setting be set to NO. The
HYB
SENSOR
setting must also be set in the
5B
mode to the
sensor where temperature needs to be maintained. It must
be set to OFF in the 5A mode.
Method 5A
USE SENSOR = YES
HYB SENSOR: OFF
Method 5B
USE SENSOR = NO
HYB SENSOR: SUPPLY, DHW,
RETURN
Each sensor selection/location has its advantages.
Selecting the:
Supply
sensor will limit the temperature/firing rate of the
boiler, but may not be sufficient for continuous demand or
speed in heating the tank. It is already available, so no
additional sensor is needed.
Return
sensor will allow the boiler to run its supply
temperature up quickly, but may bounce off of the
operating limit band. This would heat the tank in the
shortest time, but may overheat the tank. It is already
available, so no additional sensor is needed.
DHW
sensor will allow the placement anywhere needed
to maintain that locations temperature. This is an
additional sensor that needs to be acquired.
A thermostat can be placed in a tank and connected to the
OR OVR input. (
On Member boilers only,
The Master
uses OR OVR already with DHW METHOD 4), When
the thermostat contact closes across the input
OR OVR
(J12A .7 & .8)
on a Member boiler
,
the control
will sense
this closure and disconnect itself from HeatNet.
DHW METHOD 6: DHW using Direct
Control
If the control‟s
SETTINGS: 4-20mA
input is set to
PRIORITY = HIGH the 4-20mA signal, once brought above
the 4-20mA starting current can be used to override any other
Heat Demand and direct modulate the boiler.
This can be set in menu:
ADVANCED SETUP:4-20mA
INPUT
. It allows a member boiler to be taken offline and
directly modulated by an external control.
If the Master is using it for heating and the
ADVANCED
SETUP:4-20mA
is set to PRIORITY= HIGH, an external
control can now output a 4-20mA signal which will take over
the boiler‟s fire rate and override all other heating demand
inputs. The external control would also need to open any
valves/ or pumps. This is typically used for DHW control.
48
Содержание KN-10
Страница 107: ...107 ...
