Spec Sheet

Maximum temperature of the water through the pump is
165⁰ F (73⁰ C).
In order to obtain maximum performance in terms of dura-
tion of seals and valves, it is necessary to respect a few
simple rules, as follows:
1) In order to avoid damage caused by cavitation,
the pump must be pressure fed.
The higher the inlet pressure, the longer the life of
the wet end of the pump.
When working at 165⁰ F (73⁰ C), the minimum feed
pressure - measured directly in the inlet port of the
pump when it is working - is 45 psi (3 bar).
The minimum feed pressure according to the
different temperatures are:
Naturally, if the application allows for feeding the pump
with 45 psi (3 bar) even at low temperatures
(for example: 115⁰ F/45⁰ C the life of the wet end of the
pump will be even longer.
2) The plumbing which feeds the pump must be
of a diameter at least equal to the inlet port.
Also, follow the suggestions below:
a) Make the plumbing as short and straight as
possible, preferably in an upward direction to
facilitate the expulsion of eventual air bubbles
naturally if compatible with the requirements
of the system.
b) It is always useful to put a filter at the inlet
with capacity of 4 to 5 times the flow of the pump,
for example for a 4 gpm (15 lmin) pump, put a
filter from 16 to 20 gpm (60-75 l/mi)The mesh size
suitable for this application is 0.016” (.4 mm).
ET Series
Instructions and Recommendations for the Installation of
ET Series Pumps
the pump, for example for a 4 gpm (15 lmin)
pump, put a filter from 16 to 20 gpm (60-
75 l/mi)The mesh size suitable for this
application is 0.016” (.4 mm).
c) It is extremely important to put a pressure
switch on the suction port of the pump, and
in any case downstream from the filter, so
that it can stop the pump should the feed
pressure drop by 20% due to the filter
clogging or failure of the feed pump, etc.
3) Change of oil
We recommend the first oil change after the
first 50 hours, with the pump stopped and
the oil still warm.
This change is not recommended because the oil
has lost its properties, but rather to eliminate the
impurities that have gotten into the oil during the
running-in phase. If these impurities are not
removed, but are allowed to remain in the oil,
they may cause premature wear to the moving
parts and the oil seals. After this initial change,
the oil can then be changed every three
months or 300 hours of operation thereafter.
Please note: If the pump works in conditions with
high humidity and with sharp temperature
changes, it is possible that condensation will
appear inside the crankcase, which mixing with
the oil can change its properties. This is easy
to see because the oil changes to a white, milky
color.
If the pump does not have excessive water
leaking from the packings, and the oil becomes
milky, the oil has to be changed more frequently.
The percentage of water in the oil must not
exceed 20%.
Use oil per the following chart:
Hollow Shaft - Electric
CHART OF COMPATIBLE OILS SAE15W40
General Pump Series 100
BP VISCO 2000
CASTROL CWX
MOBIL SUPER
SHELL HELIX SUPER
TOTAL QUARTZ 4000-5000
GENERAL PUMP
A member of the Interpump Group
Ref 300967 Rev. G
08-20