)5;=B5 ' ' %' 1+9J(D9F5H=B;"BGHFI7H=CBG
-=;<H9B H<9D=D9G CF IB=CB 7CID@=B; HC H<9 9LH9BHGI::=7=9BH
HC9BGIF95H=;<HG95@
L79GG=J9HCFEI9A5M75IG985A5;9HCH<9DIAD
0<9BH<9D=D9CFIB=CB7CID@=B;=GACIBH98?99DH<9DIAD
75G=B; 7CBB97H=CB 6@C7?98K=H< 5 G97CB8 KF9B7< A5?=B;
GIF9H<97CBB97H=CB=GBCH89:CFA986M9L79GG=J9H=;<H9B=B;
-<9D=D98=5A9H9FGAIGHBCH69GA5@@9FH<5BH<9DIAD7CB
B97H=CBG
6.4.2. Suction pipe
CF75D57=H=9GCJ9FA
<IG95GI7H=CBD=D9 '
The suction pipe must be perfectly airtight.
0=H< 5 pump located above the water level GI7H=CB @=:H
CD9F5H=CB D5Ffig. 1, fig. 3:=H5:CCHJ5@J9K=H<GHF5=B9F
K<=7< AIGH5@K5MG F9A5=B =AA9FG98 CF 5 7<97?J5@J9 CB
H<9GI7H=CB7CBB97H=CB
":CD9F5H=B;K=H<flexible hoses IG95G9A=F=;=8GI7H=CB<CG9=B
CF89FHC5JC=8H<9<CG9B5FFCK=B;8I9HCGI7H=CBJ57IIA
0=H<H<9 liquid level on the suction side above the pump
=B:@CK IB89F DCG=H=J9GI7H=CB <958 D5F fig. 2 :=H 5B
=B@9H;5H9J5@J9
C@@CK@C75@GD97=:=75H=CBG=:=B7F95G=B;B9HKCF?DF9GGIF9
Install a strainer on the suction side of the pump to pre-
vent foreign particles from entering the pump.
6.4.3. Delivery pipe
=H 5;5H9 J5@J9 =B H<9 89@=J9FMD=D9 HC 58>IGH89@=J9FM 5B8
<958
"BGH5@@5DF9GGIF9;5I;9
6.5 Electrical connection
@97HF=75@ 7CBB97H=CB AIGH 69 75FF=98 CIH CB@M 6M 5
EI5@=:=98 9@97HF=7=5B =B 577CF85B79 K=H< @C75@
F9;I@5H=CBG
Follow all safety standards.
The unit must be properly earthed (grounded).
CBB97H H<9 95FH<=B; ;FCIB8=B; 7CB8I7HCF HCH<9 H9FA=B5@
K=H< H<9 A5F?=B;
CAD5F9 H<9 :F9EI9B7M 5B8 A5=BGJC@H5;9 K=H< H<9 B5A9
D@5H985H55B87CBB97HH<9GIDD@M7CB8I7HCFGHCH<9H9FA=B5@G
=B577CF85B79K=H<H<95DDFCDF=5H98=5;F5A=BG=89H<9H9FA=
B5@6CL7CJ9F
ATTENTION: never allow washers or other metal
parts to fall into the internal cable opening between
the terminal box and stator. ": H<=GC77IFG 8=GA5BH@9
H<9ACHCFHC F97CJ9FH<9C6>97HK<=7<<5G:5@@9B=BG=89
":H<9H9FA=B5@6CL=GDFCJ=898K=H<5B=B@9H;@5B8IG95:@9L=
6@9DCK9FGIDD@M7CF8C:H<9!+'HMD9K=H<G97H=CBC:
756@9BCH@9GGH<5BD5F-
":H<9H9FA=B5@6CL=GDFCJ=898K=H<5B=B@9H6IG<=B;7CBB97H
H<9DCK9FGIDD@M7CF8H<FCI;<57CB8I=H
CF IG9 =BGK=AA=B;DCC@G BCHK<9B D9FGCBG 5F9 =BH<9
DCC@ ;5F89B DCB8G 5B8 G=A=@5FD@579G 5residual current
device K=H< "•' BCH 9L7998=B; A AIGH 69 =BGH5@@98 =B
H<9GIDD@M7=F7I=H
"BGH5@@5device for disconnection from the mains GK=H7<
K=H<57CBH57HG9D5F5H=CBC:5H@95GHAA=B5@@DC@9G
0=H< 5 H<F99D<5G9 ACHCF=BGH5@@5BCJ9F@C58DFCH97H=CB89J=
79K=H<7IFJ95DDFCDF=5H9:CFH<9F5H987IFF9BHC:H<9DIAD
Single-phase
NGM, NGXM, NGLM,
5F9GIDD@=98K=H<575D5
7=HCF7CBB97H98HCH<9H9FA=B5@G5B8:CF/!N
K=H<5B=B7CFDCF5H98H<9FA5@DFC
H97HCF
7 STARTUP AND OPERATION
7.1 Preliminary checks before start-up of the pump
CBCHGH5FHIDH<989J=79=B75G9C:85A5;98D5FHG
7.2 First starting
ATTENTION: never run the pump dry. ,H5FHH<9DIAD5:H9F:=@
@=B;=H7CAD@9H9@MK=H<@=EI=8
When the pump is located above the water level GI7H=CB
@=:HCD9F5H=CBD5F fig. 1, fig. 3CFK=H<5DCG=H=J9GI7H=CB
<958K<=7<=GHCC@CK@9GGH<5BAHCCD9BH<9BCBF9HIFB
J5@J9:=@@H<9DIADH<FCI;<H<9DF=A=B;<C@9D5Ffig. 5
When the liquid level on the suction side is above the
pump =B:@CKIB89F DCG=H=J9 GI7H=CB <958 fig. 2 :=@@H<9
DIAD6MCD9B=B;H<9GI7H=CB;5H9J5@J9G@CK@M5B87CAD@9
H9@M?99D=B;H<989@=J9FM;5H9J5@J9CD9BHCF9@95G9H<95=F
9:CF9GH5FH=B;7<97?H<5HH<9 G<5:H HIFBG6M<5B8CFH<=G
DIFDCG9 IG9 H<9G7F9K8F=J9F BCH7< CB H<9 G<5:H 9B8CBH<9
J9BH=@5H=CBG=89
When starting, with a three-phase motor, check H<5Hthe
direction of rotation =G5GG<CKB6MH<95FFCKGCBH<9@5BH9FB
6F57?9H7@C7?K=G9K<9BJ=9K=B;H<9ACHCF:FCAH<9:5B9B8
(H<9FK=G98=G7CBB97H9@97HF=75@DCK9F5B8F9J9FG9H<97CB
B97H=CBGC:HKCD<5G9G
7.3. Self-priming
5D56=@=HM HC 7@95F H<9 5=F =B H<9 GI7H=CB D=D9 K<9BGH5FH=B;
K=H<H<9pump located above the water level
Conditions for self-priming:
o GI7H=CBD=D9K=H<7CBB97H=CBGD9F:97H@M5=FH=;<H5B8DFCD9F@M
=AA9FG98=BH<9K5H9FHC69@=:H98
o 5@@CKAA:CF' A=B=AIAC:GHF5=;<HJ9FH=75@D=D9
56CJ9H<98=G7<5F;9DCFHD5Ffig. 1
o pump casing completely filled with clean cold water
berfore starting.
-<9 DIAD =G BCHG9@:DF=A=B;K=H< @=EI=8G 7CBH5=B=B;C=@
5@7C<C@CF:C5A=B;GI6GH5B79G
-<97<97?J5@J9D5Ffig. 1DF9J9BHGF9J9FG9G=D<CB=B;
H<FCI;< H<9 DIAD K<9B H<9DIAD =G GHCDD98 5B8F9H5=BG
K5H9F=BH<9DIAD:CFH<9B9LHGH5FH
Without a foot valve or a check valve on the suction con-
nection the filling operation must be repeated before
each start-up.
ATTENTION: avoid a prolonged operation with unprimed
pump, without water delivery from the completely ope-
ned outlet (t1, D5F fig.1, max 22 min).
":B979GG5FMF9D95HH<9DF=A=B;CD9F5H=CB5:H9FH<9DIAD<5G
699B:=FGH9ADH=985B8H<9B7CAD@9H9@M:=@@98K=H<7@95B7C@8
K5H9F
7.4. Gate valve regulation
With the gate valve completely open or with an outlet
pressure lower than the minimum pressure shown on the
name-plate, the pump may be noisy. To reduce noise
regulate the delivery gate valve.
7.5. Abnormal operation
Never run the pump for more than five minutes
with a closed gate valve.
)FC@CB;98CD9F5H=CBK=H<CIH57<5B;9C:K5H9F=BH<9DIAD
75IG9G85B;9FCIG=B7F95G9GC:H9AD9F5HIF95B8DF9GGIF9
)FC@IB;98 CD9F5H=CBK=H< 5 7@CG9889@=J9FM DCFH 75IG9G
6F95?5;9CF85A5;9HCD5FHGC:H<9DIADG99section 6.2.
0<9BH<9 K5H9F =G CJ9F<95H98 8I9HC DFC@CB;98 CD9F5H=CB
K=H<5 7@CG98DCFH GHCD H<9DIAD 69:CF9CD9B=B;H<9 ;5H9
J5@J9
Do not touch the fluid when its temperature is higher
than 60 °C.
Do not touch the pump when the surface temperature is
higher than 80 °C.
05=HIBH=@H<9K5H9F<5G7CC@98=BG=89H<9DIAD69:CF9GH5F
H=B;5;5=BCFCD9B=B;H<98F5=B=B;5B8:=@@=B;D@I;G
7.6. Automatic regulator IDROMAT
75B69GIDD@=98CBF9EI9GH
CF5IHCA5H=7 7CBHFC@C:GH5FH=B;GHCDD=B;C:H<9DIADK<9B
IH=@=N5H=CBDC=BHG5F9CD9B987@CG98
For protection of the pump:
o 5;5=BGH8FMFIBB=B;
o 5;5=BGHH<9F=G?C:CD9F5H=CB K=H<CIH K5H9F5HH<9=B@9H75I
G986M 5 @57?C:K5H9F=B:@CK =BH<9=B@9HD=D9 IB89F DCG=H=J9
GI7H=CB <958 6M 5BCB=AA9FG98GI7H=CB D=D96M9L79GG=
J9GI7H=CB@=:H CF 6M5=F9BH9F=B;H<9GI7H=CBD=D9
o 5;5=BGHCD9F5H=CB K=H<7@CG987CBB97H=CBDCFHG
,99=BGH5@@5H=CB9L5AD@9D5F fig. 2
7.7 Switch off of the pump
-<95DD@=5B79AIGH69GK=H7<C::9J9FMH=A9H<9F95F9
:5I@HGG99HFCI6@9G<CCH=B;
-<9DFC8I7H=G89G=;B98:CF57CBH=BICIG8IHMH<9GK=H7<C::
=G D9F:CFA98 6M8=G7CBB97H=B; H<9DCK9F GIDD@M 6MA95BG
H<9 9LD97H98 8=G7CBB97H=B; 89J=79GG99 D5F5;F5D<
@97HF=75@7CBB97H=CB
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