Master 540155, Owner'S Manual, Page: 3 / 12

Installation 3
recommended depth is 30” (76cm). Check local codes
for approved materials.
NOTICE: Pump should not be installed on clay, earth
or sand surfaces. Clean the area around the pump of
small stones and gravel which could clog the pump.
Keep the pump inlet screen clear.
2. Thread a 2” discharge pipe into the pump 2” NPT
discharge port. Be careful to avoid stripping or
crossing threads.
Piping – Effluent Applications
(3/4” or Less Solids)
Piping must be 1-1/2” minimum to carry volume of pump
discharge. Check local codes to determine if a check
valve is required in your system. In cold climates,
check valves are not used to prevent effluent from
freezing in piping.
Piping – Sewage Applications
(2” or Less Solids)
In any case, piping must not be smaller than pump
discharge.
When installed in a sewage system, pipe must be capable
of handling semi-solids of at least 2” (5.1 cm) diameter.
The rate of flow in the discharge pipe must keep any
solids present in suspension in the fluid. To meet
minimum flow requirements (2 feet (.6 m) per second in
discharge line), size pipe as follows:
A Pipe Size Of: Will Handle a Flow Rate Of:
1-1/2” (3.8 cm) 12 GPM (45 LPM)
2” (5.1 cm) 21 GPM (79 LPM)
2-1/2” (6.3 cm) 30 GPM (113 LPM)
3” (7.6 cm) 48 GPM (181 LPM)
NOTICE: Use PTFE pipe thread sealant tape on pipe
connections. Do not use ordinary pipe joint compound
on plastic pipe or pump. Pipe joint compound can attack
plastics and damage pump.
3. To reduce motor noise and vibrations, a short length
of rubber hose (1-5/8”(41mm) I.D., e.g. radiator hose)
can be connected into discharge line near pump
using suitable clamps.
4. If the pump discharge line is exposed to outside
subfreezing atmosphere, then the portion of line
exposed must be installed so any water remaining in
pipe will drain to outfall by gravity. Failure to do this
can cause water trapped in discharge to freeze which
could result in damage to pump.
5. Install a 2” check valve in the horizontal portion of
the discharge pipe. Make certain, the flow indicating
arrow, points away from the pump. This check valve
will keep the water from either running back into the
basin or into the area being pumped out when the
pump is not running. Check valve should be a free
flow valve that will easily pass solids.
NOTICE: For best performance of check valve when
handling solids, do not install it with discharge angled
more than 45° above the horizontal. Do not install check
valve in a vertical position as solids may settle in valve
and prevent opening on startup.
6. Drill a 3/16” (4.7mm) hole in discharge pipe about 1”-2”
(2.5 - 5.1cm) above pump discharge connection (but
below check valve) to prevent airlocking the pump.
7. Insert the float switch piggy-back plug into a properly
grounded outlet and the pump plug into the piggy-
back plug.
8. Check the installation by observing the pump
operation through one complete cycle. Make sure
that no parts of the assembly interfere with the float
switch.
Risk of flooding. May cause personal injury
or property damage. Failure to make this operational
check may lead to improper operation, premature failure,
and flooding.
For parts or assistance, call Master Plumber Pump Customer Service at
1-800-628-9439
Figure 1
Sump Pit Installation
18"
2" Checkvalve
Do Not Mount
Vertically
30"
Sump Pit
2" Discharge
Pipe
115V Properly
Grounded
Outlet
Install pump on
a hard, level surface.
Drill a 3/16"
vent hole here.
Be sure the
float switch can
swing through
it's entire arc.
Flow
Directional
Arrow
3620 0517