56
Rev 2.1
Maximum off point 32 °F to 240 °F (0 °C to 115 °C) None
Table 4.6 – Outdoor Reset Configuration Parameters
4-20 DHW Configuration Parameters
Table 4.7 displays Domestic Hot Water (DHW) configuration parameters.
Refer to 5-3 DOMESTIC HOT WATER RELATED CONFIGURATION for Domestic Hot Water (DHW) parameter
programming.
Parameter Comment Password
DHW enable Disable or Enable Domestic Hot Water Loop Installer
DHW demand Switch Modulation sensor only: no other input is considered
and pump demand is derived from burner demand
DHW switch: a switch replaces the DHW sensor, DHW
sensor in a shorted condition indicates pump demand,
and this condition also must be present for burner
demand to exist; Outlet Sensor is chosen then the outlet
sensor will provide the control temperature.
STAT terminal: the STAT input in the On condition
creates pump demand and it also must be on for burner
demand to exist; if it is off there is no demand.
Auto DHW or sensor only: When DHW is open then use
it as heat demand, and use modulation sensor selection
for operation. Otherwise if DHW is providing a
temperature, use it for heat demand and as the sensor for
operation.
Installer
Priority method Boost during priority time Installer
Modulation sensor DHW (S6S7) sensor: DHW loop operating sensor is the
DHW sensor.
Outlet (S3S4) sensor: DHW loop operating sensor is the
Outlet sensor.
Inlet (S1) sensor: DHW loop operating sensor is the Inlet
sensor.
Auto DHW (S6) of Inlet (S1): If the DHW demand switch
is configured for auto, and if it detects that the DHW
sensor is open or shorted then use the Inlet sensor for
modulation.
Auto DHW (S6) of Outlet (S1): If the DHW demand
switch is configured for auto, and if it detects that the
DHW sensor is open or shorted then use the Outlet
sensor for modulation.
Installer
DHW setpoint Setpoint for normal DHW modulation
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used whenever the time-of-day switch is
off or not connected
None
DHW time of day setpoint Setpoint when Time Of Day switch is on
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used when the time-of-day switch is on
None
DHW off hysteresis Differential above setpoint when boiler is turned off
2 °F to 30 °F (1 °C to 16 °C)
None
DHW on hysteresis Differential from setpoint when boiler is turned on.
2 °F to 30 °F (1 °C to 16 °C)
None
DHW priority override time No DHW priority time (0), or
DHW priority time
Installer
DHW hysteresis step time Time between hysteresis step changes
(0=Disable hysteresis stepping)
Installer
DHW priority source System priority
CH > DHW
DHW > CH
Installer
DHW priority vs LL System priority
LL > DHW
DHW > LL
Installer
DHW P-gain Proportional term of PID
0-400
Installer
DHW I-gain Integral term of PID
0-400
Installer
DHW D-gain Differential term of PID
0-400
Installer
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