Grundfos SE - Motor Liquid Check and Change

Do not lift or move the pump by the shaft end.
Never rest a vertically tilted pump on its impeller.
10.5 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 12.000 operating hours to prevent oxidation.
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 percentage. Always use the propylene glycol scale.
Measured freezing point Liquid ingress (%)
-20 °C (-4 °F) 0
-18 °C (0.4 °F) 5
-17 °C (1.4 °F) 10
-15 °C (5 °F) 15
-14 °C (6.8 °F) 20
If the refractive index is higher than 20 %, change the motor liquid.
Pump type
Liquid amount (l)
SL 13
SE 37
Do not exceed this level of refractive index to ensure the appropriate condition of the shaft seal and the bearings for reliable operation.
Drain the leakage chamber of the pump after 12.000 operating hours.
Normal leakage rate for the shaft seal is 2.000 ml / 12.000 operating hours. If more than 5.000 ml fluid can be drained from the
leakage chamber, the shaft seal must be replaced.
WARNING
Pressurised system
Death or serious personal injury
‐ The seal chamber may be under pressure. Loosen the screws carefully and do not remove them until the pressure is completely
relieved.
There must be minimum 10 % air in the seal housing due to thermal expansion of the motor liquid during operation.
10.5.1 Drain motor liquid on SL pumps
1. Place the pump in horizontal position, so the filling plug (412) is pointing downwards.
412
TM083646
34
English (GB)