Service Manual
1Service
Boost temperature
If a SH demand lasts longer than the programmed time delay setting (F9) 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. The boost temperature can be changed by the installer by accessing parameter F8. The temperature range of this parameter is 0°F to 45°F. The default value is 0°F. This feature will be active if this parameter is set to anything other than 0°F.
Boost time
The boost time parameter sets the amount of time that must elapse with a SH demand before the water temperature set point will be increased. This parameter can be changed by the installer by accessing parameter F9. The time range for this parameter is 1 minute to 60 minutes. The default value is 20 minutes.
G: Anti-cycling
Anti-cycling time
Once a SH demand has been satisfied, a set amount of time must elapse before the control will respond to a new SH demand. The control will block the new heat demand and
Inlet temperature differential for ending anti-cycling
The control will bypass the
Ramp delay on/off
When the ramp delay on/off parameter is active, the ramp delay limits the boiler firing rate when a SH cycle has started. There are six (6) limiting steps used to limit temperature overshoot and short cycles, see FIG.
When ramp delay is active, additional parameters for ramp delay operation will have to be adjusted. These can only be accessed by the optional PC software. See the Knight Wall Mount Smart System PC Program Instructions Manual for additional ramp delay parameter information.
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