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INSTALLATION
In this installation, if the primary sump pump does not have a check valve installed below the wye, you MUST
install a check valve for the primary sump pump as shown. This prevents backflow of water into the sump from
the battery backup system.
Check Valve Flapper(s) must swing away and flow arrow(s) must point away from the pump being protected.
The water level when the switch shuts off must be above the BBU pump intake.
HYD979 (06-08-20)
"Common Discharge"
NOTICE: In this installation, if the Primary Sump Pump (PSP) does not have a
check valve installed below the wye, you MUST install a check valve for the PSP
as shown. This prevents backflow of water into the sump from the Battery Backup
System. Check Valve Flapper(s) must swing AWAY and flow arrow(s) must point
AWAY from the pump being protected.
The water level when the switch shuts off must be above the BBU pump intake.
Typical installation,
assembled.
* Supplied with the Battery Backup System.
Both check valves
Items in italics must be purchased separately
must be installed
on the pump side
of the wye.
Optional 1-1/2"
PVC Pipe (cut to fit)
45º Slip Elbow
Battery Backup
Switch*
1-1/2" PVC Pipe
(cut to fit)
Flow Arrow; Must point
AWAY from Pump
being Protected
FP0026-10
Check Valve
(Purchase
Separately)
Lower Drischarge Pipe
1-1/2" PVC Pipe
(cut to fit)
Drill 1/8"
Anti-Airlock Hole
1-1/4" FNPTx1-1/2"
Slip Elbow*
PTFE pipe thread
sealant tape on all
threaded joints
Battery Back Up
Sump Pump*
Figure 3: Common Discharge Pipe - Typical Installation
Not to scale.
Wiring omitted for clarity.
1-1/2" PVC Upper
Discharge Pipe
(cut to fit)
U74-68 Hose and
Clamp Assembly
(Purchase Separately)
1-1/2" PVC Riser Pipe
(cut to fit)
45 degree Slip Wye
AlternateWye/Elbow
Setup
45º Slip Street
Elbow
Primary Pump
Discharge Pipe
(cut to fit)
Thread to Slip
Adapter
Primary Pump
Check Valve
Flow Arrow; Must point
AWAY from Pump
being Protected
Primary Sump Pump
Discharge Port
6783 0313a
9
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