Programming – Xylem IM098 AQUAVAR Model 56 Controller User Manual

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➔

6) To do this, enter the amount of pressure drop

you will allow before the next pump starts.
Diagram 9 shows the pressure drop and
increase.

7) To increase the pressure even more to

compensate for system loss at higher flows,
enter the total of the system drop allowed

before next pump starts and the increased
pressure desired.

For example, if the pressure drop allowed is 5 psi
before the next pump starts, and the increased
pressure needed to compensate for system losses is
3 psi, you would enter 5 + 3, or 8 psi to
compensate for both system pressure drop and
compensation requirements.

Note

This value is cumulative. An extra 3 psi will be added to the total system pressure with each
additional pump which turns on. For example, if the initial system pressure was 50 psi, pump
two would create 53 psi, pump three would create 56 psi, and pump four would create 59 psi system
pressure.

Instructions
8) Enter the required value by pressing the

arrow.

9) Press the ➔ arrow and the display will read:

10) Press the arrow to enter the % drop before the

next pump starts. Use this value for each pump
in the Aquavar Model 56 Controller system.

11) Press the ➔ arrow to enter sequence control

and then press . This function tells the next
pump when the preceding pump has reached
its maximum speed.

Notes: In most North American applications, this
would be set for 60 Hz. If you are using a 50 Hz
system, reset the display for 50 Hz.

Programming

Example Curve

Diagram 9

PUMP 1

PUMP 1 +
PUMP 2

PUMP 1 +
PUMP 2 +
PUMP 3

ACTU

AL V

E DECREASE

ACTU

INCREASE

➀ If increase = decrease, pressure stays constant
➁ If increase > decrease, pressure rises with lag pump
➂ If increase < decrease, pressure falls with lag pump

ACTUAL VALUE INCREASE

3.0 PSI

ACTUAL VALUE DECREASE

0.0 PSI

ACTUAL VALUE DECREASE

2.0 PSI

ENABLE SEQUENCE CONTROL

0 Hz

ENABLE SEQUENCE CONTROL

60 Hz