Notice – VACUUBRAND MD 1 VARIO-SP User Manual
Page 42
Do not start the pump if the
pressure difference between
inlet and outlet ports exceeds max. 16.0 psi (1.1 bar).
Attempts to start the pump at higher pressure difference
may cause stalling and damage of the motor.
NOTICE
Prevent internal condensation, transfer of liq-
uids or dust. The diaphragms and valves will
be damaged, if liquids are pumped in signifi-
cant amounts.
Check the pump regularly for external soiling
and deposits. Clean the pump if necessary
to avoid an increase of the pump’s operating
temperature.
NOTICE
IN
✘
condensate / dust
IN
✘
Avoid overheating (e.g., due to hot process
gases). Maximum permissible temperature
range: see „Gas inlet temperatures“, pg. 26.
NOTICE
Pumps with AC motor:
In case of overload, the motor is shut down by
a
self-hold thermal cutout in the winding.
Note: Only manual reset is possible. Switch
off the pump and disconnect from the power
source. Identify and eliminate the cause of fail-
ure. Allow the pump to cool down sufficiently
before restart.
Pumps with DC motor:
A temperature sensor at the circuit board protects the mo-
tor: Current limitation in case the temperature at the circuit
board raises above 158°F (70°C). At temperatures above
185°F (85°C) the pump switches off. In case of a motor
blockage (after 10 start-up attempts) the pump switches
off.
Note: Only manual reset is possible. Disconnect the pump
from the power source. Identify and eliminate the cause of
failure.
NOTICE
°C / °F
I ➨ O
!
3.
2.
1.
NOTICE