WattMaster WHP | Section 1 |
|
|
Staged Heat Addition
Heat Addition is staged up based on a different deadband level for each stage. Basically, if the user programmed a 2° deadband, then the first stage could activate at the setpoint, stage 2 would activate 2° below the setpoint, stage 3 would activate 4° below the setpoint, etc...
Staging down is calculated in the same manner, except the water temperature would need to increase above the setpoint by the deadband amount. If stage 3 was activated at 4° below setpoint, it would
A user defined staging up and down interval must be met before any heat addition stages can be added or removed. If the selected Water Temperature is below the current staging level and the timer has been satisfied, an additional stage can be added, up to the maximum available 8 stages. If the selected Water Temperature is above the staging down level and the timer has been satisfied, a stage can be removed.
Proportional Heat Addition
If the Water Temperature is below the addition setpoint, a Boiler Enable relay is activated. If the Water Temperature rises 1° above the setpoint the Boiler Enable relay is
At a user defined rate, the analog output signal is proportionally controlled from 0.0 VDC at 1° above setpoint to the full 10.0 VDC signal as the water temperature drops below the setpoint by the user defined deadband amount. If a 5° deadband was entered, the maximum voltage would be reached at 4° below the setpoint and the minimum voltage would be set at 1° above the setpoint. Since this is strictly proportional control, at 1.5° below setpoint the controller would set 5.0 VDC since that would be half the deadband amount.
Design Guide |
|
