Gorman-Rupp Pumps 84A2-F3L 1348524 and up User Manual

Page 15

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OM−00900

80 SERIES

OPERATION

PAGE C − 3

The unit can be started manually with the key-
switch in the AUTO START" position by pressing
the white MAN" button. The Single Lightning
Bolt" light will illuminate in conjunction with an au-
dible alarm before the unit starts.

Stop the unit manually by pressing the OFF/SET"
button.

OPERATION

Pump speed and operating condition
points must be within the continuous per-
formance range shown on the curve (see
Section E, Page 1).

Lines With a Bypass

Either a Gorman-Rupp automatic air release valve
or a hand operated shutoff valve may be installed in
a bypass line.

If a Gorman-Rupp Automatic Air Release Valve has
been installed, the valve will automatically open to
allow the pump to prime, and automatically close
after priming is complete (see INSTALLATION for
Air Release Valve operation).

If the bypass line is open, air from the suction line
will be discharged through the bypass line back to
the wet well during the priming cycle. Liquid will
then continue to circulate through the bypass line
while the pump is in operation.

Lines Without a Bypass

Open all valves in the discharge line and start the
power source. Priming is indicated by a positive
reading on the discharge pressure gauge or by a
quieter operation. The pump may not prime imme-
diately because the suction line must first fill with
liquid. If the pump fails to prime within five minutes,
stop it and check the suction line for leaks.

After the pump has been primed, partially close the
discharge line throttling valve in order to fill the line
slowly and guard against excessive shock pres-
sure which could damage pipe ends, gaskets,

sprinkler heads, and any other fixtures connected
to the line. When the discharge line is completely
filled, adjust the throttling valve to the required flow
rate.

Leakage

No leakage should be visible at pump mating sur-
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi-
mum pump efficiency.

Liquid Temperature And Overheating

The maximum liquid temperature for this pump is
110

_ F (43_C). Do not apply it at a higher operating

temperature.

Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup-
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.

Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over-
heated pump. Vapor pressure within the
pump can cause parts being disen-
gaged to be ejected with great force. Al-
low the pump to cool before servicing.

Strainer Check

If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in-
stalled, monitor and record the readings regularly
to detect strainer blockage.

Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces-
sary, liquid pressure must be limited to 50% of the

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