Xylem IM098 AQUAVAR Model 56 Controller - Manual (Page 6)

System Design
System Design
Note
Systems MUST be designed by qualified technicians only.
The following diagrams show typical single pump and multi-pump systems using the AQUAVAR Model 56 Controller.
Connection can be made directly to a water supply or water can be drawn from a supply tank or well. In the case of
supply tanks and wells, level switches, (item 10) can be used to shut down the pumps when water is low. In the
direct connection, a pressure switch on the suction side (item 8) can be used.
A diaphragm pressure tank is used on the discharge side of the pump or pumps to maintain pressure in the line when
there is no demand. This will keep the pumps from continuing to run. With the AQUAVAR Model 56 Controller, it is not
necessary to have a large tank for supply purposes. In selecting a tank, make sure it can withstand system pressure.
The tank should have a capacity of about 10% of the maximum single pump flow rate in gpm. Pre-charge the tank to
the following:
PSI Set Pressure 15 30 45 60 75 90 105 120 135 150
PSI Tank Pre-charge 12 21 37 52 64 77 95 110 125 138
Note
Closed loop circulator systems may not require a pressure tank.
Diagram 1
Multiple Pump Layout
Diagram 2
Single Pump Layout
Indirect connection
via supply tank Suction out of a well Direct connection
10
10
11
6
3
2
4
8
9 5
1
14
4
9
4
8
5
1
14
4 4
8
5
1
14
4
2
9 9
4
8
5
1
14
4
1 Pump with AQUAVAR Model 56
Controller
2 Diaphragm tank
3 Distribution panel
4 Gate valves
5 Check valves
6 Foot valves
8 Incoming pressure control
9 Pressure gauges
10 Level switches
11 Supply tank
14 Pressure transmitter
1