D.5.A Variable Speed Pump Control - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual
Category ii and iv venting with touchscreen controls
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8.D.5.a
Variable Speed Pump Control
This screen allows the adjustment of the following parameters:
• On Delay – Upon a call for heat, once the unit ignites, this is the amount of time the unit will wait prior to modulating
the pump speed.
• Proportional Gain – This value is the corrective action that is proportional to the error (Set Point – Control
Temperature).
• Integral Time – This value is applied to the sum of the error over a period of time.
• Derivative Time – This value is applied to the rate of change of the error.
• Minimum Speed – This is the minimum speed to which the variable speed pump controller will control the pump.
Changes to min/max speed require cycling power to accept the changes, similar to changing
communication protocols, see Section 8.D.10.d on page 87.
• Maximum Speed – The is the maximum speed to which the variable speed pump controller will control the pump.
• Off Delay – Once the heat demand is satisfied, the variable speed pump controller will control to the maximum pump
speed until the Off Delay time expires.
• Delta T – Will control the pump to maintain this delta T (temperature rise) across the unit.
NOTE: Variable Speed Pump Control applies only to boilers.
C O N F I G U R A T I O N
Page 79
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