1 Service
Outdoor Air Shutdown Differential
The outdoor air shutdown differential parameter is the number of degrees below parameter C5 the outdoor air temperature must go before the boiler will respond to a SH demand. This parameter can be changed by the installer by accessing parameter C6.
Service Manual
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. This parameter can be changed by the installer by accessing parameter C9.
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. This parameter can be changed by the installer by accessing parameter C7.
Boost Temperature
If a SH demand lasts longer than the programmed boost time delay setting (C7) and there have been no HWG 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. The boost temperature can be changed by the installer by accessing parameter C8.
D: Ramp Delay
Ramp Delay (Enable / Disable)
This parameter allows the installer to enable or disable the SH ramp delay by accessing parameter D1.
SH Ramp Delay
The SMART TOUCH control can be programmed to limit the firing rate for a fixed period of time at the start of a space heating demand. There are six (6) possible limits, each with their own time delay. The first limit applies as soon as the burner starts. Once its time delay expires, the second limit is applied and its timer begins. The control steps through these limits until the 6th (sixth) limit expires. Note, however, that the 6th limit will also limit the rate for the rest of that heat demand. The installer can adjust the firing limits and time delays by accessing parameters D2 through D13.
Figure 1-7 Ramp Delay Interval
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