English (GB)
10
9.1 Frost protection
Pumps which are not being used during periods of
frost must be drained to avoid damage.
Remove the filling and drain plugs from the pump.
See fig. 10.
Do not refit the plugs until the pump is taken into
operation again.
9.2 Cleaning
Prior to a long period of inactivity, flush the pump
with clean water to prevent corrosion and deposits in
the pump.
Use acetic acid to remove possible lime deposits
from the pump.
10. Service
Before the pump is returned to Grundfos for service,
the safety declaration at the end of these instructions
must be filled in by authorised personnel and
attached to the pump in a visible position.
If Grundfos is requested to service the pump, it must
be cleaned before it is returned.
If proper cleaning is not possible, all relevant
information about the pumped liquid must be
provided.
If the above is not fulfilled, Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are to be paid
by the customer.
The safety declaration can be found at the end of these
instructions (only in English).
11. Technical data
11.1 Enclosure class
• IP55 (standard)
• IPx5 (with motor drain plug removed)
11.2 Sound pressure level
The sound pressure level of the pumps is lower than
70 dB(A).
11.3 Ambient temperature
1)
Only the stainless-steel variant (EN 1.4301 / AISI
304) is suitable for pumping liquids with
temperatures above 90 °C (194 °F).
2)
Does not apply for pumps with PSE approval
(pumps approved for use in Japan).
If the ambient temperature exceeds 55 °C (45 °C for
pumps with PSE approval), do not fully load the
motor due to the risk of overheating. In such cases,
you may need to derate the motor output or use an
oversize motor with a higher rated output. You can
derate the CM pumps in relation to the ambient
temperature without any consequence. Contact
Grundfos for further information. See fig. 13.
Fig. 13 Derating in relation to the ambient
temperature
Before startup after a period of inactivity,
the pump and the suction pipe must be
completely filled with liquid. See section
8. Startup.
If used for a liquid which is injurious to
health or toxic, the pump will be classified
as contaminated.
Self-priming pumps:
The liquid temperature must not exceed 60
°C (140 °F).
Maximum ambient
temperature
Liquid temperature
55 °C (131 °F)
2)
90 °C (194 °F)
1) + 2)
50 °C (122 °F)
2)
100 °C (212 °F)
1) + 2)
45 °C (113 °F) 110 °C (230 °F)
1)
40 °C (104 °F) 120 °C (248 °F)
1)
TM05 7630 1313
20 25 30 35 40 45 50 55 60 65 70 75 80
50
60
70
80
90
100
[%]
P2
t [°C]
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