Midea MCCDH30A-TA3SL, Technical & Service Manual

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Air-cooled modular chiller unit
1
Regularly preventive maintenance plan
Maintenance Items Frequency Qualify Standards (Settlement) Note
General
Noise Anytime
Judge whether there is abnormal sound by
hearing;
Watch from one meter
away from the center of
the unit; Vibration Anytime
Watch whether the swings of distribution pipes
and components are too large
Voltage Anytime Rating voltage is within ±10%
Appearance
Clean Anytime Keep it clean anytime
Calm Anytime Lock each snail
Insulation
material flakes
Anytime Stick it
Water leak Once/ Month Check whether the exhaust water pipe blocks
Compressor
Noise Anytime
Whether there is abnormal sound when starts
up, runs or stops
Insulation
resistance
Once/ Year
Above 5MΩ is required when testing with
DV500V high resistance meter
Hock proof rubber
gets old
Once/ Year Flexible when pressed with hands is qualified
Medium check
Once/3000
hours
Pay attention to the noise libation and oil level
Medium check
Once/6000
hours
Confirm the action of safety device and
protection device
Fin-coil heat
exchanger
Fan Anytime
Normal wind amount, high pressure when
refrigerating and low pressure when heating
within the normal range
Clean frequency Once/Month
Normal wind amount, high pressure when
refrigerating and low pressure when heating
within the normal range
Shell land tube
heat exchanger
Water flow of the
user side
Anytime Within ±5% of the standard
Temperature Anytime Within the standard
Antifreeze
concentration
Once/Month Make sure it is set above the concentration
Refer to the physical
characteristics of
cold-resistance liquid
Water quality Once/Month Within the standard
Refer to water quality
furring relations
drawing
Purity Anytime
The low pressure is within the standard when
refrigerating
The high pressure is within the standard when
heating
Drainage Anytime Drain all the water if it is not used for a long time
Drain water in the
distribution pipe
High and low
pressure switch Action
Once/Month Check according to “Protection Devices Action „ Whether the match
point is good
Pressure
Gauge
Finger
Once/ Half of
a year
Compare with correct pressure gauge
Globe valve Action Once/Month Smooth action on globe valve switch
Refrigeration
circle
Refrigeration
media leak
Once/Month
Check whether there is refrigeration media
leakage inside the unit or at the distribution pipe
connecting points. Let out all the water inside
the shell-and-tube heat exchanger, and check
whether there is any leakage at the water inlet
or outlet.
Use the electronic leak
detector, or blowtorch
leak detector, or soap
water.
Electrical
machine control
Insulation
resistance
Once/Month Above 1MΩ is required when testing with
DV500V high resistance meter.
Wire contact Once/Month
Insulation layer of the wire must be under good
contact condition, without damage, bolt well
fixed.
Assistant relay Once/Month No abnormal action
Time-limited relay Once/Month Act according to the time set