6
CONTENTS
Page
1. Applications 6
2. Technical data 6
2.1 Temperatures 6
2.2 Maximum permissible operating pressure 6
2.3 Maximum inlet pressure 7
2.4 Minimum inlet pressure 7
2.5 Sound pressure level 7
3. Installation 7
4. Electrical connection 8
4.1 Frequency converter operation 9
5. Start-up 9
5.1 Priming 9
5.2 Checking of direction of rotation 9
6. Operation and maintenance 9
6.1 Frequency of starts and stops 9
6.2 Maintenance 9
6.3 Frost protection 9
6.4 Cleaning 9
6.5 Service 9
7. Fault finding chart 10
8. Disposal 10
1. Applications
Grundfos pumps, type CHI, are horizontal multistage
centrifugal pumps of the non self-priming type
designed for pumping thin non-explosive liquids.
The CHI pump with integral motor is fitted to a base
plate.
The pump is made of corrosion-resistant materials,
which makes it ideally suited for water supply and a
wide range of applications in industry, agriculture
and in the food industry.
Note: The pump has been tested with water only.
The pump is designed for pumping clean water,
domestic hot water, aqueous solutions, cleaning
solutions, suspensions or light oils and other liquids
with a density and viscosity corresponding to those
of water. The liquids must not contain abrasive parti-
cles or fibres.
When pumping liquids with a density or viscosity
higher than that of water, motors with correspond-
ingly higher outputs must be used.
As standard, the mechanical shaft seal for the CHI
pump is available in six versions with different mate-
rial combinations, see the stamping code on the
pump nameplate.
Example: Type CHI 4-50 A-W-G-BQQE.
* SiC: Silicon carbide.
** Only CHI 15 and CHI 20.
2. Technical data
2.1 Temperatures
2.2 Maximum permissible operating
pressure
10 bar.
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local regula-
tions and accepted codes of good prac-
tice.
The pump must not be used for the trans-
fer of inflammable liquids such as diesel
oil, petrol or similar liquids.
Code
Shaft seal materials
Seal faces Rubber parts
BQQE
BQQV
SiC/SiC*
EPDM
FKM
BUBE
BUBV
Tungsten carbide/
carbon
EPDM
FKM
**BAQE
**BAQV
Carbon graphite/
SiC*
EPDM
FKM
Pump types
O-ring material/liq-
uid
Temperature [°C]
Liquid
CHI 2
CHI 4
CHI 8
CHI 12
EPDM
–20
+120
FKM/liquid containing water
–20
+90
FKM/oil without water
–20
+120
FKM/oil without water
(where cUL and CSA
approval is required)
–20
+110
CHI 15
CHI 20
–20
+70
Ambient tem-
perature
All
At a relative humidity of
maximum 95%
–20
+40
Storage
All
–50
+70
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