Boiler Control Instruction & Operation Manual, Rev 1
Page
35
of 64
Setup & Tuning
Parameter Adjustment
DHW Continued
Factory
Setting
Range /
Choices
Parameter and Description
DHW
Switch
DHW Switch,
DHW Sensor
DHW Demand Switch
Domestic Hot Water Demand may respond to the boiler
’s DHW Switch or DHW
Sensor.
When
“DHW Switch” is selected the boiler responds to a domestic hot water demand
when a DHW Switch is sensed at J9 terminal 1 & 2 and is fired in response to the Outlet
Sensor.
When
“DHW Sensor” is selected the boiler responds to a domestic hot water demand
when the DHW Sensor, temperature measured at J9 terminal 1 & 2 is below the
“DHW
Setpoi
nt” less “Difference Below” and is fired in response to the DHW Sensor.
Outlet
Sensor
Outlet Sensor,
DHW Sensor
DHW Modulation Sensor
When
“Outlet Sensor” is selected the boiler is fired in response to the Outlet Sensor.
When
“DHW Sensor” is fired in response to the DHW Sensor.
Boost
during
priority
time
Boost,
Drop
DHW Priority Method
Boost Sequencer to respond to an Isolated DHW demand that is piped to a single
boiler. The individual boiler goes on
“Leave” from the Sequencer Master and
goes to DHW Service.
Drop The Sequence Master responds to the DHW Call For Heat. This allows one
or more boilers to provide heat to the IWH.
Press WARM WEATHER SHUTDOWN
CONFIGURATION to adjust the following parameters.
Factory
Setting
Range /
Choices
Parameter and Description
Disabled
Enable/
Disable
Warm Weather Shutdown Enable
Disable Warm Weather Shutdown (WWSD) is not used.
Enable A central heat boiler start is prevented if the outside temperature is
greater than the WWSD setpoint. WWSD is initiated as soon as outside air
temperature is above WWSD Setpoint. The control does not require call for
heat to be satisfied before entering WWSD.
The boiler will still start in response to a Domestic Hot Water call for heat.
70°F
20 to100 (ºF)
Warm Weather Shutdown Setpoint
The Warm Weather Shutdown (WWSD) Setpoint used to shut down the boiler when
enabled by the “WWSD Enable” parameter.
