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GQ, GX, GM Rev. 5 - Operating Instructions
GB
7 STARTUP AND OPERATION
7.1 Preliminary checks before start-up of the
pump
Do not start-up the device in case of damaged parts.
7.2 First starting
With a three-phase power supply make sure the
direction of rotation is correct.
Before installation, momentarily start the motor to check
through the suction opening that the rotation of the impel-
ler is as shown by the arrow on the pump. Otherwise
disconnect electrical power and reverse the connections
of two phases in the control box.
Operation with wrong direction of rotation will cause
vibration and loss of delivery capacity.
Reverse rotation can also demage the mechanical seal.
When in doubt, take the pump out of the water and check
rotation of the impeller by sight.
Never introduce fingers in the suction
opening
unless it is absolutely certain the
electric power has been disconnected (that the
pump cannot be accidentally switched on) and
the impeller has stopped rotating completely.
GQG cutting of fingers or hand
The motors with supply current directly switched
by thermally sensitive switches can start automati-
cally.
Never take the pump out of the water while the pump is
still operating.
Avoid running dry.
Construction with float switch:
the float switch con-
nected directly to the pump controls starting and stop-
ping.
Check that the float switch is free from any obstacle.
Construction without float switch:
start the pump
only if fully immersed in the liquid to be raised.
The Single-phase motor will stop if operation is prolon-
ged with water at a temperature above 35 °C.
When the windings cool down, the thermal protector
enables restarting.
Relief valve
for GQR, GQN, GQS, GQV, GQG: the
pump is fitted to a relief valve for air release around
the impeller granting a proper pump priming also
after long standstill periods.
7.3 Switch off of the pump
The appliance must be switch off every time
there are faults. (see troubleshooting).
The product is designed for a continuous duty, the
switch off is performed by disconnecting the power
supply by means the expected disconnecting devi-
ces. (see paragraph "6.8 Electrical connection").
8 MAINTENANCE
Before any operations it's necessary to disconnect
the power supply.
If required ask to an electrician or to an expert techni-
cian.
Every maintenance operations, cleaning or
reparation executed with the electrical system
under voltage, it could cause serious injuries
to people.
A possible replacement of the cable or the level
switch must be carried out by an authorised
Calpeda service workshop.
If the supply cord is damaged, it must be
replaced by the manufacturer, its service agent
or similarly qualified persons in order to avoid a
hazard.
In case of extraordinary maintenance, or maintenan-
ce operations that require part-removing, the opera-
tor must be a qualified technician able to read sche-
mes and drawings.
It is suggest to register all maintenance operation
executed.
During maintenance keep particular attention
in order to avoid the introduction of small
external parts, that could compromise the
device safety.
It is forbidden to execute any operations with
the direct use of hands. Use water-resistant,
anti-cut gloves to disassemble and clean the
filter or in other particular cases.
During maintenance operations external
personnel is not allowed.
Maintenance operations that are not described in this
manual must be made only by special personnel
authorized by Calpeda S.p.A.
For further technical information regarding the use or
the maintenance of the device, contact Calpeda
S.p.A.
8.1 Routine maintenance
Before every maintenance operations
disconnect the power supply and make sure
that the device could not accidentally operate.
The pump may have been immersed in
hazardous
substances
or
products
emanating toxic gases, or may be located in
an environment which is toxic due to other
reasons;
make
sure
all
necessary
precautionary measures are taken to avoid
accidents.
Any pumps that require inspection/repair must be
drained and carefully cleaned inside and outside
before dispatch/submission.
Hose down all accessible parts with a jet of water.
If there is a risk of freezing, take the pump out of the
water and leave in a dry place.
When used with muddy liquids, run the pump briefly
with clean water to remove all deposits immediately
after use or before a period of inactivity.
Check periodically that the relief valve item 14.80 is not
clogged by impurities. If required, remove the screws
14.24 and the fixing ring 14.22.
8.2 Dismantling the system
Close the suction and delivery gate valves and drain
the pump casing before dismantling the pump.
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IST GQ_GX_GM_07_2018R5_MXS 11_03con gall 09/07/18 09:06 Pagina 13
