Pentair MYERS MDC33P1 Notice D'utilisation page 5

4. Install the pump in the pit so that the switch
mechanism has maximum possible clearance.
5. Install the discharge plumbing. When using rigid
pipe, use plastic pipe. Wrap the threads with
PTFE tape. Screw the pipe into the pump hand
tight +1 – 1-1/2 turns.
NOTICE: Do not use ordinary pipe joint compound
on plastic pipe. Pipe joint compound can attack
plastics and damage the pump.
Risk of flooding. If a flexible discharge
hose is used, make sure the pump is secure in
the sump to prevent movement. Failure to secure
the pump may allow pump movement, switch
interference and prevent the pump from starting
or stopping.
6. To reduce motor noise and vibrations, a short length
of rubber hose (e.g. radiator hose) can be connected
into the discharge line near the pump using
suitable clamps.
7. Install an in-line check valve to prevent backward
flow through the pump when the pump shuts off.
8. Power Supply: The pump is designed for 115 V.,
60 Hz., operation and requires a minimum
15 amp (1/3 HP) or 20 amp (1/2 HP) individual
branch circuit (refer to Motor, Switch and Cord
Specifications). Both the pump and switch are
supplied with 3-wire cord sets with grounding-type
plugs. The switch plug is inserted directly into the
outlet and the pump plug inserts into the opposite
end of the switch plug.
Hazardous voltage. Can shock, burn
or kill. The pump should always be electrically
grounded to a suitable electrical ground such as a
grounded water pipe or a properly grounded metallic
raceway, or ground wire system. Do not modify the
cord or plug or cut off the round ground pin.
9. If the pump discharge line is exposed to an outside
sub-freezing atmosphere, the portion of the line
exposed must be installed so any water remaining in
the pipe will drain to the outfall by gravity. Failure to
do this can cause the water trapped in the discharge
to freeze which could result in damage to the pump.
10. After the piping and check valve have been installed,
the unit is ready for operation.
11. Check the operation by filling the sump with
water and observing pump operation through one
complete cycle.
Risk of Flooding. Failure to make this
operational check may lead to improper operation,
premature failure, and flooding.
Risk of electrical shock. Can burn or cause
death. Do not handle a pump or pump motor with wet
hands or when standing on a wet or damp surface, or
in water.
Before attempting to check why unit has stopped
operating, disconnect power from unit.
Risk of fire and explosion. Can cause
severe injury, property damage or death. Do not use in
explosive atmospheres. Pump water only with this pump.
1. The shaft seal depends on water for lubrication
and cooling. Do not operate the pump unless it is
submerged in water as the seal may be damaged if
allowed to run dry.
2. The motor is equipped with an automatic reset
thermal protector. If the temperature in the motor
should rise unduly, the switch will cut off all power
before damage can be done to the motor. When the
motor has cooled sufficiently, the switch will reset
automatically and restart the motor. If the protector
trips repeatedly, the pump should be removed and
checked as to cause of difficulty. Low voltage, long
extension cords, clogged impeller, very low head or
lift, etc., could cause cycling.
3. The pump will not remove all water. If a manually
operated pump is operating and suddenly no water
comes out of the discharge hose, shut the unit off
immediately. The water level is probably very low
and the unit has broken prime.
3-1/2"
(89 mm)
Figure 2 – Float Switch Tether Length, Models
MDC33P1, MDC33PC1, MDC50P1 and MDC50PC1.
NOTICE: Do not change the tether length of the float
switch. The float must be able to swing through its
complete arc without interference.
Airlocks
When a pump airlocks, it runs but does not move any
water. An airlock will cause the pump to overheat and
fail. These pumps have a built in anti-airlock hole. See
Repair Parts for the location of the hole. Leakage from
the anti-airlock hole is normal.
If you suspect an airlock, unplug the pump, clean out the
anti-airlock hole with a paper clip or a piece of wire, and
restart the pump.