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TABLE I Performance Chart/Sears Diehard Size 24M or 27M
Battery Size
Gallons Per Minute
Hours Available
Total Gallons Pumped
BATTERY REQUIREMENTS
Hazardous electrical current. Can cause
severe burns and start a fire if battery terminals are short
circuited. Install battery in box. To prevent accidental
shorting across battery terminals, strap cover securely on
battery box. Do not leave battery uncovered. Do not
allow children to play around sump pump installation.
Your Backup Sump Pump depends on the battery used
with it for power. The better the battery, the better the
performance of the pump. We recommend use of a Sears
DieHard Size 27M or 24M Deep-Cycle Marine battery.
This battery will perform well for many hours and stands
up well to long periods of little or no use.
In an emergency a Sears DieHard Size 27M or 24M stan-
dard automobile battery may be used. However, an auto-
motive battery may require charging after only 1 to 2
hours of continuous use, and the repeated charging cycles
may cause early plate failure in the battery.
Use only a new, fully charged battery that will fit in the
battery box (maximum size 12-5/8" long, 7" wide and 9-
3/8" high including terminals).
PUMP INSTALLATION and OPERATION
NOTICE: We recommend a trial fitting of all components
before gluing anything. This will allow you to check pump
mounting height, float switch clearance, etc., while
adjustments can still be easily made.
1. Mark side of sump six inches down from top.
2. Fill sump until primary sump pump starts; normal high
water level should not be above mark made in step 1.
If it is higher, backup float switch may not swing far
enough for proper operation. To lower high water
level, adjust switch on primary sump pump. See
primary pump owner's manual.
3. Drain sump. Measure down 11 inches from top of
sump; mark this point on side of sump. Install tee with
center of threaded inlet at least this far below top of
sump to allow sufficient room for float switch to swing
(see Figure 2A).
4. Make sure that installation will not interfere with
primary sump pump operation as follows:
A. Backup pump installation must not interfere with
primary sump pump float switch swing.
B. Normal high water level must never be high
enough to start backup sump pump.
C. Install a check valve (Sears Stock No. 2789) in the
main sump pump discharge pipe between the pump
and the backup mounting tee (see Figures 2A and 2B).
5 FEET
27M
24M
19.5
19.5
7.0
6.0
7,750
6,888
VERTICAL PUMPING DISTANCE
10 FEET
27M
24M
12.8
12.8
9.0
8.0
6,680
5,820
Flow through this check valve must be away from the
main sump pump; don't install it backwards! This
check valve will prevent recirculation into the sump
during battery-powered pump operation.
5. Cut rigid discharge pipe from primary sump pump to
length. Use PVC piping. Tee supplied is 1-1/2" slip fit;
if necessary use 1-1/4" bushings supplied.
NOTICE: Use any tee that fits sump pump discharge
line; the adapter that is supplied (Key No. 10, Page 7)
will fit any galvanized or plastic 1-1/4" tee. Do not
glue the tee until all parts have been trial fitted.
6. Thread adapter into tee (Figure 2B). When installed,
molded-in 'up' should be on top.
7. Install backup pump check valve in adapter. Tab on
backup pump check valve fits into notch at top of
adapter.
8. For trial assembly, slip pump into backup pump check
valve to check pump mounting height and to make
sure that there is no interference with float switch
operation on either pump; be sure floats will not rub
on side of sump, catch between pump and sump wall,
interfere with each other, etc.
9. Remove pump from adapter; remove tee.
10. Using PVC glue, permanently reinstall tee in primary
sump pump discharge pipe.
Tether Length 2"
7" Min.
(178mm)
Figure 2A – Standard Installation
4
15 FEET
27M
2
10.5
1,160
TOP VIEW
Grounded
Electrical
Outlet
(51mm)
12" Min.
(305mm)
Check
"Turn On"
Valve
Water Level
Check
Valve
1380 1194
24M
2
9.0
1,116
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