5 Unit maintenance
5.1 Maintenance and inspection
Daily maintenance and periodical maintenance is
essential to ensure that the MAHU and associ-
ated devices perform as designed specifications.
Please follow the requirement listed below to
ensure MAHU long-term safety operation (the
MAHU power supply shall be powered off when
inspecting).
•
During the commissioning, check the unit once
a day. During normal operation, periodical
maintenance shall be carried out at a fre-
quency of once a week to once a quarter or
once half a year to once a year in accordance
with operating environment and conditions.
•
Bolts on all parts are tightened, or otherwise it
will become a major cause of vibration.
•
Belt and pulley
(only used for belt-driven fan)
- The belt tension of MAHU has been adjusted
in factory. However, belt slack may occur
due to some factors. Therefore, re-adjust
belt tension if necessary. Apply a load of
20-30N pressure to the center of belt, and
the deflection of the belt is approximately
5-20mm (→ Fig. 16).
- When the belt cracked, broken or heavily
worn, it shall be replaced with a new imme-
diately.
- Check pulley for angle error. If the installa-
tion accuracy of two pulleys is not enough, it
will affect the belt service life. For the axle
parallelism and eccentricity, please maintain
θ
＜
1/3°(Fig. 17).
- The bearing will be damaged if the pulley
side has been suffered strong impact during
installing and removing pulley.
Fig. 16 Schematic diagram of belt tensioning
Fig. 17 Schematic diagram of pulley calibration
•
Bearing
Permanently lubricated bearings are maintenance
-free, the oil filling time for other bearings could
follow the recommendation as follows. Under
normal operation:
- If The unit runs below the temperature at
40
℃
operating environment, filling oil once in
every 2,000-5,000 hours. When the environ-
ment temperature raise each 10
℃
, the life-
time of grease and lubrication should be cut
by half.
- If unit is running in wet environment with rela-
tive humidity greater than 85%, filling lubricat-
ing oil once every 2000-2,500 hours.
The filling time above is just for reference, if fan
manufacture has special requirements, please do
it according to the fan manufacturer’ s require-
ment
.
14 | Unit maintenance
8736862495(2015/07) Climate 5000
θ
θ
a
a
5~20mm
P20-30N
Notice:
When Re-lubrication, please clean the
nozzle, remove the harden grease;
please don't stop until the new oil is
squeezed out from the bearing, in order
to avoid over-adding, please use your
hands to move the bearing during
adding. To avoid the lubrication oil
splashing, use cotton to wipe out the
extrusion lubricant oil after adding; after
filling the lubrication oil, please cover
the plastic lid over filler hole.
Warning:
Before re-lubrication, please cut off the
power supply. Otherwise it may cause
electric shock or other injuries like
scrambled into running machine, result
in serious harm or death.
