9
HYD979 (06-08-20)
INSTALLATION
Battery Backup
Switch*
Primary Pump
Discharge Pipe
(cut to fit)
Primary Sump Pump
Discharge Port
Primary Pump
Check Valve
Flow Arrow; Must point
AWAY from Pump
being Protected
45º Slip Elbow
PTFE pipe thread
sealant tape on all
threaded joints
1-1/4” FNPTx1-1/2”
Slip Elbow*
Battery Back Up
Sump Pump*
Thread to Slip
Adapter
45 degree Slip Wye
FL
OW
Optional 1-1/2”
PVC Pipe (cut to fit)
1-1/2” PVC Pipe
(cut to fit)
Lower Drischarge Pipe
1-1/2” PVC Pipe
(cut to fit)
AlternateWye/Elbow
Setup
45º Slip Street
Elbow
FL
OW
“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.
*
Supplied with the Battery Backup System.
Items in italics must be purchased separately
Typical installation,
assembled.
Both check valves
must be installed
on the pump side
of the wye.
FP0026-10
Check Valve
(Purchase
Separately)
1-1/2” PVC Riser Pipe
(cut to fit)
1-1/2” PVC Upper
Discharge Pipe
(cut to fit)
Flow Arrow; Must point
AWAY from Pump
being Protected
U74-68 Hose and
Clamp Assembly
(Purchase Separately)
Drill 1/8”
Anti-Airlock Hole
6783 0313a
Not to scale.
Wiring omitted for clarity.
Figure 3: Common Discharge Pipe - Typical 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.
