6
Submersible sewage and
drainage pumps
GX 40, GM 50
OPERATING INSTRUCTIONS
1. Pump designation
See designation on the pump name-plate or on
the bar-code label.
Meaning of the designations:
GX 40
= Stainless steel pump with G 1
1
/
2
ISO 228 (DN 40) delivery connection.
GM 50
= Cast iron pump with G 2 ISO 228
(DN 50) delivery connection.
GM 50-65
= Cast iron pump with (DN 65)
flanged delivery connection.
C
= With two- (
GXC
) or single-passage
(
GMC
) impeller.
V
= With free-flow (vortex) impeller.
M
= With single-phase motor (without
indication = with three-phase motor).
2. Operating conditions
Standard construction
- For clean and dirty water, also containing solids
with maximum size:
35 mm for
GX 40
;
45 mm for
GMC ..
; 50 mm for
GMV ..
..
With a high solid content or with filamentous par
ticles use only the free-flow (vortex)
GXV
and
GMV
construction.
- Maximum liquid temperature: 35 °C.
- Maximum liquid density: 1100 kg/m
3
.
- Minimum dimensions of installation pit:
0.55x0.55m; depth 0.5 m.
- Minimum immersion depth:
250 mm for
GX 40
;
180 mm for
GM 50
.
- Maximum submersion depth:
GX 40
= 5 m;
GM 50
= 10 m (with suitable cable length).
- Maximum starts/hour: 30 at regular intervals.
Sound pressure at minimum immersion depth:
< 70 dB (A).
Noise disappears when the pump is submersed.
Do not use in garden ponds, tanks or
swimming pools when people are in the
water.
The Pump cannot be used in
explosive or flammable environments.
3. Installation
The internal diameter of the delivery pipe must never be
smaller than the diameter of the pump connection port:
G 1
1
/
2
(DN 40) for
GX 40
;
G 2 (DN 50) for
GM 50
;
(DN 65) for
GM 50-65
.
The pump must be lifted and transported using
the handle fitted for this purpose and not pulled
by the electrical power cable.
Place the pump, with vertical axis, at the bottom
of the pit or at the site of installation.
3.1. Stationary installation
For stationary installation fit a check valve against
back flow in the delivery pipe.
Provide for the possibility of removing the pump
without having to drain the entire system (if
necessary, fit a gate valve and a union coupling).
With the pump in the resting position secure the
delivery pipe to a rest, suitable for its length and
weight.
If slime deposits are expected to form at the
bottom of the installation pit, a support must be
provided to keep the pump raised.
3.2. Transportable installation
A
safety rope or chain
of non-perishable material
should always be used to secure the pump.
When a plastic or flexible delivery pipe is used,
the safety rope or chain should be utilized for
lowering, securing and raising the pump.
3.93
.037
/3
3.93.037/3
GX
= 250
GM
= 180
GX
= 450
GM
= 500
3.93
.037
/3
3.93.037/3
GX
= 250
GM
= 180
GX
= 450
GM
= 500
On
Off
