Motor Liquid Check And Change - Grundfos SE Serie Notice D'installation Et De Fonctionnement

10.1 Motor liquid check and change

Clean the outside of the pump regularly to retain the heat
conductivity.
Change the motor liquid once a year or after 2000
operating hours to prevent oxidation.
Lack of motor liquid may cause overheating and damage
FM
to the mechanical seals.
Use SML3 cooling liquid for motor cooling. Liquids with
FM
lower specific heat capacity than SML3 may cause
overheating to the motor.
10.1.1 Checking the motor liquid
The ingress level of the pumped liquid into the motor liquid can be
checked. Use a refractometer (product no. 98676968) which shows
the refractive index in percent. Always use the propylene glycol
scale.
Measured freezing point
-20 °C (-4 °F)
-18 °C (0.4 °F)
-17 °C (1.4 °F)
-15 °C (5 °F)
-14 °C (6.8 °F)
If the refractive index is higher than 20 %, change the motor liquid.
Do not exceed this level of refractive index to ensure the
appropriate condition of the shaft seal and the bearings for reliable
operation. For further information, see the service instruction for SE,
SL pumps.
For draining and changing the motor liquid, see
the SE/SL 12-42 hp Service instructions
http://net.grundfos.com/qr/i/98355584
Drain the leakage chamber of the pump after 2000
operating hours.
WARNING
Pressurized system
Death or serious personal injury
‐
The oil chamber may be under pressure. Loosen the
screws carefully and do not remove them until the
pressure has been fully relieved
There must be minimum 10 % air in the seal housing due
to thermal expansion of the motor liquid during operation.
Liquid ingress percent (%)
0
5
10
15
20
21