Grundfos CHI 12, Installation And Operating Instructions Manual

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8
Pipe connections:
Suction and discharge ports (fig. 3):
Fig. 3 Suction and discharge ports
Install the pipes so that air locks are avoided, espe-
cially on the suction side of the pump. Shown in
fig. 4.
Fig. 4 Pipe installation
Isolating valves should be fitted on either side of the
pump to avoid draining the system if the pump needs
to be cleaned or repaired.
If pumps are installed close to living accommodation,
it is advisable to fit anti-vibration mountings either
side of the pump and between foundation and pump
to prevent vibration being transmitted through the
pipework. This applies especially to pumps installed
in concrete buildings.
Install the pump so that it is not stressed or strained
by the pipework, especially tension caused by varia-
tions in temperature.
If the pumps are installed in long pipes, these should
be adequately supported before and after the pump.
If there is any danger of the pump running against a
closed valve in the discharge pipe, a bypass should
be installed on the discharge side of the pump to
ensure that adequate cooling and lubrication water is
circulated through the pump (a minimum flow equal
to 10% of the nominal flow is needed at all times).
4. Electrical connection
The electrical connection and protection should be
carried out in accordance with local regulations. The
connections are shown in the wiring diagram inside
the terminal box cover.
The operating voltage and frequency are marked on
the nameplate. Please make sure that the motor is
suitable for the electricity supply on which it will be
used.
Single-phase motors incorporate a thermal over-
load switch and require no additional motor protec-
tion.
Note: Single-phase motors with UL approval (1 x
115/230 V, 60 Hz) do not have built-in motor protec-
tion and therefore require external motor protection.
Three-phase motors must be connected to an
approved motor starter.
On pumps with the base plate fitted to the pump part ,
the terminal box can be turned to three positions, in
90° steps, see fig. 5.
To change the position of the terminal box, proceed
as follows:
1. Remove the four screws securing the motor to
the motor stool.
2. Turn the motor to the required position.
3. Replace and tighten the four screws.
Fig. 5 Base plate fitted to pump
Pumps with the base plate fitted to the motor must
be installed with the terminal box in position 0°, see
fig. 6.
Fig. 6 Base plate fitted to motor
Pump type
Suction/dis-
charge port Torque
[Nm]
CHI 2: Rp 1 50 - 60
CHI 4: Rp 1¼ 50 - 60
CHI 8: Rp 1½ 50 - 60
CHI 12: Rp 1½ 50 - 60
CHI 15: Rp 2 50 - 60
CHI 20: Rp 2 50 - 60
TM
00
59
28
06
97
T
M
00
22
63
01
95
Discharge port
Suction port
Never make any connections in the pump
terminal box unless the electricity supply
has been switched off.
The pump must be connected to an exter-
nal mains switch.
TM
00
59
27
06
97
TM
00
5
926
13
00
0°
90° 270°
0°