DA Series
Operation Manual
26
The cooler is used to cool the lubricating oil. When the efficiency of the cooler is reduced for
blocking or scales, the system may be halted for high exhaust temperature. So it shall be
maintained clean during daily maintenance to ensure cooling effect.
6.9 Oil Filter
As a paper filter, the oil filter is used to remove the impurities in the oil to improve the lubrication
effect and reduce its damage to the compressor bearing and some parts. The Denair service
staff will measure the pressure valve in front and at the back of the oil filter, observe the quality
of the lubricating oil at every onsite inspection. The staff may suggest changing a new product
based on the synthetic judgment. With the controller set to the longest service time, when the
controller displays a warning message, the oil filter of the air compressor unit shall be replaced
with a new one. If the blocked parts are not replaced, the lack of oil in the lubricating oil pipeline
system may cause the exhaust temperature to be too high, or shorten the service time of the key
parts, components or bearing. In even severe cases, the compressor may be burned out.
6.10Exhaust Temperature Sensor
The sensor is used to detect the exhaust temperature of the compressor and send the message
to the controller to maintain the normal operation of the compressor. In case that the exhaust
temperature is detected too high, the controller may shut down the air compressor to prevent
the parts from being damaged and accidents.
6.11Pressure Sensor
The compressor is equipped with a pressure sensor to send the message to the controller for
process and judgment to ensure the normal operation of the air compressor in a perfect
protection.
7. Maintenance
Any dismounting shall be implemented after the motor and the fan have stopped working
completely and make sure the power is cut off. A signboard shall be set on the starter at the
maintenance of the air compressor with the words of “warning: under overhaul, no driving”. The
maintenance of pressure parts shall be started after the internal compressed air is exhausted
completely.
7.1 Inspection and Update of Belt and Pulley
(1) Adjustment of belt and pulley
The tension of the belt can be automatically adjusted with the self-weight of the motor and the
equilibrium principle to produce the torque, thus there is no need for tension adjustment and
calibration for changing the belt. The belt has a long service time, the working pressure and air
volume can be easily changed as required. The pulley can be verified by placing a ruler or
vertical bar closely at the end of the pulley and measuring the distance “A” between the outer