43
Figure 20 Oil heater
Specification
：
150W, 300W; 110V or 220V; IP 54; UL approval
Note: If the compressor is installed in low ambient temperature area, it is recommended insulate oil separator against
cold environment.
f. Oil level switch
There are 3 wires on Hanbell oil level switch. 2 of them are for the interlock to main control circuit or independent circuit
for micro controller, the other one with green color for grounding. To prevent oil level switch from tripping caused by oil
foaming or surging in the sump, a time delay of max 15 seconds is recommended.
Max. contact capacity = 50VA DC/AC
Initial contact resistance = 150m
Ω
(Max.)
Switching voltage = 600V DC
Max. voltage = 300V DC/AC
Max. current = 0.5A DC/AC
Figure 21 Oil level switch
Notes:
1. There is a triangle mark on the float indicating the sensor direction. Before you install an oil level switch on a
compressor or an external oil separator, please take the triangle mark as reference before installing any oil level
switch on the compressor or external oil separator.
2. Please check the triangle mark and modify the oil level switch if needed. This triangle mark should point upward in
any case.
3. The installations of the oil level switch on a compressor and an external oil separator are shown below.
Figure 22 Oil level switch on a compressor Figure 23 Oil level switch on an external oil separator
g. Oil drain valve
Oil drain valve is installed in a compressor to drain out oil for maintenance.
Figure 24 Oil drain valve
Normal Level
Low Level
N.O.
N.C.
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