CONTROL METHODS
HeatNet Control V3 3.x
Page 59
DHW Method 5b: Local DHW Tank Heating using a Thermostat & Hybrid
Sensor.
Figure 42
Example:
DHW Heating to a Local Boiler’s Tank, Movable Sensor Location – Method 5b
System Header Sensor
MASTER
MEMBER
2
MEMBER
3
HNET
Lo
ca
l P
u
m
p
HNET
DH
W
P
u
m
p
DH
W
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st
em
Re
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Se
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so
r
DH
W
S
en
so
r
O
R
O
V
R
Su
p
p
ly
Se
n
so
r
O
R
O
V
R
Su
p
p
ly
H
ea
d
er
Se
n
so
r
System Pump
HeatNet
HeatNet
Domestic
Supply
Cold Water
Make Up
Lo
ca
l P
u
m
p
Cold Water
Makeup
E
xp
a
n
sio
n
T
an
k
Domestic
Supply
Cold Water
Make Up
WM
Optional
Location
Optional
Location
R
e
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H
e
ad
e
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Se
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HeatNet
Sy
st
em
P
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m
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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/valve 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.