CleaverBrooks ADAC 1000, Operation Manual

Page: 54 / 140

Chapter 3 — Commissioning
3-32 Part No. 750-386
The DA Primary Makeup Valve (Transfer Valve) may be biased
toward the Full Closed position if the water level in the Surge Tank
becomes too low.
Biasing the transfer valve will help prevent the Surge Tank water
level from reaching a Low Water Cutoff level, disabling the Transfer
Pumps.
Surge Level Bias Set Point 1: This is the Surge Tank level where
biasing begins to be applied to the DA Primary Makeup Valve. Bias
% = 0.
Surge Level Bias Set Point 2: This is the Surge Tank level where the
DA Primary Makeup Valve is being biased at 100%. If the Surge
Tank level reaches Bias Set Point 2 the DA Primary Makeup Valve
will be biased Fully Closed.
During biasing, the DA Primary Makeup Valve control output is still
being influenced by the water level in the DA Tank. The bias is
simply a multiplier to the DA Primary Makeup Valve control output.
The multiplier is linear between 0-100% as Surge Tank level
decreases between Bias Set Point 1 and Bias Set Point 2.
A Help Screen is available.
Figure 3-31 Valve Bias Help