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6. Operating conditions
6.1 Maximum number of starts and stops
The number of starts and stops via the power supply must not
exceed four times per hour.
When switched on via the power supply, the pump starts after
approximately 5 seconds.
If a higher number of starts and stops is desired, use the input for
external start-stop when starting or stopping the pump.
When started via an external on/off switch, the pump starts
immediately.
6.2 Alternating operation of twin-head pumps
On twin-head pumps, the duty and backup pumps must be
alternated on a regular basis, i.e. once a week, to ensure an even
distribution of the operating hours on both pumps. The pumps
alternate automatically. See section
Setup of multi-pump system
(
).
If twin-head pumps are used for pumping domestic hot water, the
duty and backup pumps must be alternated on a regular basis,
i.e. once a day, to avoid blocking of the backup pump due to
deposits such as calcareous deposits. As default, the pumps
alternate automatically. See section
Setup of multi-pump system
(
).
6.3 Ambient temperature
6.3.1 Ambient temperature during storage and transportation
Minimum: -22 °F (-30 °C)
Maximum: 140 °F (60 °C).
6.3.2 Ambient temperature during operation
1 x 200-230 V
Minimum
-4 °F (-20 °C)
122 °F (50 °C)
Maximum
The motor can operate with the rated power output, P2, at 122 °F
(50 °C), but continuous operation at higher temperatures reduces
the expected product life. If the motor is to operate at ambient
temperatures between 122 and 140 °F (50 and 60 °C) (for 3 x
380-500 V), or 104 and 122 °F (40 and 50 °C) (for 1 x 200-230 V
or 3 x 200-240 V), select an oversized motor. Contact Grundfos
for further information.
12
11.43 "Multipump setup"
11.43 "Multipump setup"
3 x 200-240 V
3 x 380-500 V
-4 °F (-20 °C)
-4 °F (-20 °C)
104 °F (40 °C)
122 °F (50 °C)
6.4 Installation altitude
Installation altitude is the height above sea level of the installation
site. The motors can be installed up to 11,482 feet (3500 m)
above sea level.
Motors installed up to 3280 feet (1000 m) above sea level can be
loaded 100 %.
Motors installed more than 3280 feet (1000 m) above
sea level must not be fully loaded due to the low
density and consequent low cooling effect of the air.
P2 [%]
100
90
80
70
60
0
2000
4000
6000
0
500 1000 1500 2000 2500 3000 3500 [m]
Fig. 13 Motor output power in relation to altitude
In order to maintain the galvanic isolation and ensure correct
clearance according to EN 60664-1:2007, you must adapt the
supply voltage to the altitude:
Supply voltage [V]
500
480
460
440
420
400
380
0
2000 4000 6000 8000 10000 11000
0
500 1000 1500 2000 2500 3000 3500 4000
Fig. 14 Supply voltage for three-phase motor in relation to
altitude
Supply voltage [V]
250
240
230
220
210
200
0
2000 4000 6000 8000 10000 11000
0
500 1000 1500 2000 2500 3000 3500 4000
Fig. 15 Supply voltage for single-phase motor in relation to
altitude
8000 10000
[ft]
Altitude
[ft]
[m]
Altitude
[ft]
[m]
Altitude
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