Service Manual
17
1 Service (continued)
Outdoor Reset
Outdoor Reset Curve
The Outdoor Temp Min and Set Point Max define the
upper point of the Outdoor Reset Curve. The lower point
is defined by the Outdoor Temp Max and Set Point Min.
The curve will level out at Set Point Min for temperature
warmer than Outdoor Temp Max. The Space Heat 1 Set
Point (User Set Point) will serve as the maximum set point
generated by the Outdoor Reset, regardless if this value
is higher or lower than Set Point Max. The curve will
continue increasing set point above Set Point Max as the
outdoor temperature falls lower than the Outdoor Temp
Min if the User Set Point is higher than the Set Point Max.
The curve will be shortened such that the outdoor reset
set point will not reach Set Point Max in case the User Set
Point is below Set Point Max. In this case, the maximum
set point will be achieved at some outdoor temperature
higher than Outdoor Temp Min.
Outdoor Temperature: Shutdown
When the outdoor temperature rises above this point, the
control will block all SH demands (DHW demands will still
be active).
Outdoor Temperature: Differential
The outdoor temperature differential parameter is the number
of degrees the outside air temperature must fall below the
outdoor shutdown parameter setting before the boiler will
respond to a SH demand.
Shift OA Reset Curve
The shift reset curve parameter shifts the actual set point above
or below the calculated set point by the number of degrees in
this parameter.
Boost Time
The boost time parameter sets the amount of time that must
elapse with a SH demand before the water temperature
calculated set point will be increased.
Boost Temperature
If a SH demand lasts longer than the programmed boost
time delay setting and there have been no DHW demands,
the control will increase the water temperature set point by
the amount in this parameter. If the SH demand continues
through another time period, the set point will be increased
again. This will continue until either the SH demand ends,
a maximum of 20 increases has occurred, or the maximum
set point has been reached. Once the SH demand has been
satisfied the set point will revert back to its calculated setting.
Menu
Parameter Name
(as shown on the LCD screen)
Min
Max
Default
Value Value Value
Set point: Cold Day 32 185 180
Set point: Warm Day 32 185 110
Outdoor Temperature: Cold Day -22 120 25
Outdoor Temperature: Warm Day -22 120 70
Outdoor Temp: Shutdown 32 122 80
Outdoor Temp: Diff 0 48 10
Shift OA Reset Curve -27 27 0
Boost Time 0 250 0
Boost Temperature 0 30 0
Table 1C Outdoor Reset (This table lists control module parameters; use the sub-tab under the Setup tab to access
them.)
OUTDOOR RESET
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