Laars OMNITHERM ONH1250, Инструкции по сборке, установке и эксплуатации, Страница: 71 / 136

Page 71
C O N F I G U R AT I O N
The
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8.D.6.a Vari-Prime
Vari-Prime is the variable speed pump control and the Vari-Prime Screen allows the adjustment of the
following parameters:
The Vari-Prime Parameters 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 Vari-Prime will control the pump.
• Maximum Speed
– The is the maximum speed to which the Vari-Prime will control the pump.
• Off Delay – Once the heat demand is satisfied, Vari-Prime will control to the maximum pump speed until the Off Delay
time expires.
• Delta T – Vari-Prime will control the pump to maintain this delta T (temperature rise) across the unit.
•
PrePurge Speed -
When using Vari-Prime, when there is an active heat demand but the burner is not yet lit, this
parameter allows the adjustment of pump speed during this time.
•
PostPurge Speed
- When using Vari-Prime, when the boiler goes into post purge, this parameter allows the
adjustment of pump speed during this time.
NOTE: Vari-Prime applies only to boilers