CONTROL METHODS HeatNet Control V3
Page 53
DHW Method 5b: Local DHW Tank Heating using a Thermostat & Hybrid
Sensor.
Example: DHW Heating to a Local Boiler’s Tank, Movable Sensor Location – Method 5b
System Header Sensor
MASTER
MEMBER
2
MEMBER
3
HNET
Local Pump
HNET
DHW Pump
DHW Pump
System Return
Sensor
DHW Sensor
OR OVR
Supply
Sensor
OR OVR
Supply Header Sensor
System Pump
HeatNet
HeatNet
Domestic
Supply
Cold Water
Make Up
Local Pump
Cold Water
Makeup
Expansion Tank
Domestic
Supply
Cold Water
Make Up
WM
Optional
Location
Optional
Location
Return Header Sensor
HeatNet
System Pump
Tank Thermostat
Tank Thermostat
System
Supply
System
Return
DHW METHOD 5b: Local DHW Tank Heating using an aquastat and a Hybrid Sensor.
In DHW METHOD 5b: Local DHW Tank Heating using an aquastat and a Hybrid Sensor, the Master’s Heat Demand input
enables space heating by energizing the system pump and maintaining the Heating Setpoint at the Master’s System Header Sensor
using the available members. A Member boiler will enable its local pump when called to service a heating call by the Master.
Each member has its OR OVR input connected to a local tank aquastat. This method allows the DHW Temperature Sensor to be
placed in many locations. This sensor is called the Hybrid Sensor. When the aquastat located in the DHW tank calls for heat, the
local boiler goes offline from the Master and services the DHW call. The Member then disables its local pump, and enables its
DHW pump to maintain the DHW Setpoint at the Hybrid Sensor location. Once the DHW aquastat has been satisfied, the boiler
is placed back online for the Master to service the main heating loop.
Member 2 is configured to use its Local Supply sensor when servicing DHW demands, and Member 3 is configured to use its
DHW sensor.
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