Gorman-Rupp Pumps S4A1-E25 460/3 1396155 and up - Manual (Page 18)

OM-06098 S SERIES PUMPS
PAGE C - 2 OPERATION
or thermal protection, or if the pump is operated
against a closed discharge valve for an extended
period of time.
Do not start the pump more than 6 times
per hour. If the motor does not cool be­
tween starts it will overheat, resulting in
damage to the motor windings.
As a safeguard against rupture or explosion due to
heat, models equipped with oil‐lubricated motors
are fitted with a pressure relief valve which will open
if vapor pressure within the pump motor reaches a
critical point. Always terminate power to the pump
and control before investigating pump or control
box problems.
Approach the pump cautiously after it
has been running. Although the motor is
cooled by the liquid being pumped, nor­
mal operating temperatures can be high
enough to cause burns. The tempera­
ture will be especially high if operated
against a closed discharge valve. Never
operate against a closed discharge
valve for long periods of time.
If overheating does occur, stop the pump immedi­
ately and allow it to cool before servicing it. Ap­
proach any overheated pump cautiously.
Overheated pumps can cause severe
burns and injuries. If overheating of the
pump occurs:
1. Stop the pump immediately.
2. Ventilate the area.
3. Allow the pump to completely cool.
4. Check the temperature before ser­
vicing.
5. Vent the pump slowly and cau­
tiously
6. Refer to instructions in this manual
before restarting the pump.
It is recommended that the pressure relief valve as­
sembly be replaced at each overhaul, or any time
the pump motor overheats and activates the valve.
Never replace this valve with a substitute which
has not been specified or provided by the Gorman‐
Rupp Company.
Impeller Rotation
Check impeller rotation as follows before operation
to ensure that the impeller is rotating in the correct
direction.
While checking impeller rotation, secure
the pump to prevent the power cable from
coiling.
Suspend the pump from the lifting device fitted on
the pump. Apply power briefly and note the direc­
tion of pump kickback. As viewed from the top, the
pump should kick in a counterclockwise direc­
tion; this will indicate that impeller rotation is cor­
rect.
If the pump kicks in a clockwise direction, impeller
rotation is incorrect. If the pump is powered by a
three‐phase motor, have a qualified electrician in­
terchange the control box connections of any two
pump motor power leads. Re‐check pump kick­
back; it should now be in a counterclockwise direc­
tion.
If rotation is incorrect on a single‐phase motor, con­
tact the factory before installing the pump.
The electrical power used to operate