RBI HEATNET 3.0 Torus Series, Руководство пользователя

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CONTROL METHODS HeatNet Control V3
Page 32
This method requires a 10k thermistor connected to the
DHW Sensor input of a DHW MASTER, or a stand-alone
boiler, and a DHW tank. This method does not use a
HEADER sensor. The DHW temperature is maintained by
the space heating PID for backwards compatibility. With
this method the OR OVR input does not function as a DHW
enable and is not used. The Heat Demand input is used to
enable/disable DHW heating operations.
The system pump is enabled on the Master when the Heat
Demand input is closed. The Master’s DHW pump is
engaged only when there is a call for DHW heating by the
system. This allows for a DHW loop/buffer and A DHW
tank that can be heated using the Master’s DHW pump
(Reverse/Return only) or each boiler’s Local Pump/Valve
off of this loop/buffer.
DHW Page 1
DHW Page 2
Boilers are started when the tank’s water temperature is
below the (DHW SETPOINT – LOWER BAND). The first
boiler is started immediately. The next boiler(s) is started
after the ADD BOILER DELAY time expires. Boilers are
not added when the temperature is above the (DHW
SETPOINT – LOWER BAND) and below the UPPER
BAND. Once the UPPER BAND is exceeded, boilers will
shut off based on the SHED BOILER DELAY TIME.
Setting up this method is done via the menus in:
SETTINGS: DOMESTIC HOT WATER.
Connect a
10k thermistor from the DHW tank’s sensor
well to J10B terminals on the DHW MASTER, or
stand-alone boiler. Wire a pump or valve from the
DHW pump or the System pump (normally open) relay
contact to control flow of the heating water into the
tank’s coil or system loop.
The System pump will always be enabled as long as
the Heat Demand input is closed. The DHW pump
will be enabled whenever there is a DHW call for
heat.
A DHW call for heat is when the DHW temperature
is below the (DHW SETPOINT – LOWER BAND)
or when the DHW temperature is below the (DHW
SE UPPER BAND) and boilers are
firing. After a DHW call for heat ends:
A. The pump will remain on during a post purge
pump cycle until the post purge timer expires.
1. Next, enter the DOMESTIC HOT WATER menu
on the Master boiler. In the BOILER MODE
selection , enter OFF . The Master uses this method
as a DHW system much like a space heating
system.
Member boilers may set the BOILER MODE to
LOCAL and go offline to perform secondary DHW
heating, but the Master setting must be set to OFF.
Setting the BOILER MODE to Combination using
this method may cause erratic operation and the DHW
pump to not be enabled.
2. Change the DHW SETPOINT to the desired target
temperature of the water in the tank. Once the control
determines there is a call for DHW, the DHW
SETPOINT is loaded, and the Master boiler will
target the setpoint.
3. Now, change the LOWER BAND to the desired
temperature (DHW SETPOINT – LOWER BAND)
below which boilers are to be added. This setting
corresponds to the minimum water temperature
required in the tank. DHW heating will be initiated
when the DHW tank’s water temperature is below the
temperature (DHW SETPOINT – LOWER BAND).
How long the temperature of the tank stays below the
temperature (DHW SETPOINT – LOWER BAND)
is