MYERS 4WHV & V4WHV NON-CLOG PUMPS
These instructions cover the service of the 4WHV and V4WHV series or non-clog pumps and guide rail systems
for the horizontal discharge models. Both models are designed for handling raw sewage and waste water. Do not
use for acid waste water. The pumps have 2-vane, non-clog impellers. The 4WHV and V4WHV will pass 3” dia.
Solids and has a 4” std. flange discharge.
CAUTION
: In the initial installation, before sewage is admitted to wet well, there is no danger on entering the
sump, but after sewage has been in the sump there is
danger
. Sewage water gives off methane and hydrogen
sulfide gases, both of which are highly poisonous. Never enter wet well unless cover is open and an outside blower
is used to force fresh air into the wet well. Also, the man in the wet well should wear a harness with rope to surface
so that he can be pulled out in case of asphyxiation. One man should not work alone.
SEAL FAILURE
The 4WHV and V4WHV pumps have a probe installed in the seal chamber so that any leakage past the lower seal
is detected. A red warning light at the control panel comes on if water enters the seal chamber. This is an indicator
only and does not stop the motor. It warns that seal should be replaced within 2 to 3 weeks. LONGER RUNNING
WITHOUT SEAL REPLACEMENT COULD DAMAGE MOTOR. MOTOR MUST GO TO AUTHORIZED
SERVICE STATION FOR SEAL REPLACEMENT.
HEAT SENSOR
All 4WHV and V4WHV single and three phase pumps have motor heat sensors which are externally wired to the
control panel. Any motor temperature above the sensor rating will open the heat sensor and stop the motor. The
sensor will automatically close upon cooling. It is important that the heat sensor wires and seal failure wires are
connected at the panel terminal block. Warranty is void if wires are not connected or are jumped.
CAUTION:
The single phase 4WHV and V4WHV pumps with automatic heat sensor rest will restart without
warning as the motor cools. There,
never
do service work on the pump unless power supply is disconnected.
MOTOR POWER CABLE AND CONTROL CABLE
Each power cord has 4 conductors – white, black red and green. For 3 phase, the red, black and white conductors
connect to the 3 line terminals and the green is connected to a good outside ground such as a ground rod at least 8
feet into soil. Interchange any tow of the three power conductors will reverse a 3 phase motor.
For single phase, the white and black leads connect to the two-line terminals and the red connects to the start
winding terminal. The green is for ground and must be connected to a good outside ground. The control cable has
4 conductors – black, white, red and green. White and black connect to heat sensor terminals, red connects to the
seal failure terminal and green connects to the ground terminal.
CAUTION:
Never pull pump or work on control box until incoming power is disconnected. Never run motor
until green ground conductor is connected to a good outside ground. Never pull on electrical cables to lift pump.
OIL FILLED MOTOR
The motor chamber and seal chamber are dielectric oil-filled for good heat transfer and lubrication of bearings and
seals. The motor requires no other lubrication. Oil level in the motor housing should be to the bottom of the oil fill
plug with the pump in a vertical position. Do not overfill the motor housing since some space is required for oil
expansion. Oil level in the seal chamber of the 4WHV and V4WHV should be checked with the pump laying
horizontally with the fill plug at the top. The oil level should be approximately ¾” from the outside surface of the
housing. Transformer oil SOHIO Factopure SE40 should be used.
