Panasonic WU-216MF2U9 - Service Manual - Page 94

Compressor, 1. Compressor Trouble Diagnosis and Check Methods

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99.. CCoommpprreessssoorr 32WAYY VVRRFF SSYYSSTTEEMM OOuuttddoooorrUUnniittRReeppaaiirrPPrroocceedduurreess 9-1. Compressor Trouble Diagnosis and Check Methods Generally, compressor failures can be classified into the following categories. (1) Mechanical trouble → (A) Locking (intrusion of foreign objects, galling, etc.) (B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator rotor, valve, or other component) (2) Electrical trouble → (A) Coil burning (B) Open circuit (C) Insulation failure (D) Short circuit Trouble diagnosis is based on the following remote controller displays: 1 [P16] [P29] : 1st compressor, right side when viewed from front [P19] [P26] : 2nd compressor, left side when viewed from front A judgment is made based on factors that include the following: coil resistance (varies depending on the compressor), insulation resistance, current, leakage breaker operation, oil and refrigerant fouling, odor, pressure, and noise. 2 Reference: Insulation resistance (Use a DC 500 V insulation resistance meter and measure the insulation resistance between the electrified and non-electrified parts.) (1) Motor → Min. 300 MΩ (2) Compressor → Min. 100 MΩ (servicing part) (3) Unit → Min. 10 MΩ (This is due to the presence of refrigerant, which decreases the 3 insulation resistance.) * Minimum insulation resistance as required by generally accepted requirements is 1 MΩ. JUDGMENT START Follow the instructions in 4 Is there burning of the failed compressor motor? NO "2. Discharging Compressor Oil" and drain the oil from the failed YES compressor. Then inspect. Follow the instructions in "2. Discharging Compressor Oil" and drain the oil from all compressors in the same system. Then inspect. YES Is the color phase 4.0 or above, or is a sharp odor present? 5 NO Are there 2 or more outdoor units wherethe compressor oil color phase is 4.0 or NO higher or where a sharp odor is present? Go to "9-2-2. Replacing all Go to "9-2-1. Replacing only the compressors in a failed unit". failed compressor". 6 YES Go to "9-2-3. Replacing all compressors in a system". Follow the instructions in "9-2-4. Dry core cleaning" and Follow the instructions in "9-2-4. Dry core cleaning" and perform dry core cleaning of all outdoor units. perform dry core cleaning of the failed outdoor unit. 7 Reference: Symptoms of motor burning 1. Ground fault results in breaker operation. 2. Short circuit results in different coil resistance at different phases. 3. Open circuit 8 9 2 - 26

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3WAY VRF SYSTEM
Outdoor Unit Repair Procedures
2
- 26
2
9. Compressor
9-1. Compressor Trouble Diagnosis and Check Methods
Generally, compressor failures can be classified into the following categories.
(1) Mechanical trouble →
(1) Motor →
Min. 300 MΩ
(2) Compressor → Min. 100 MΩ (servicing part)
(3)
* Minimum insulation resistance as required by generally accepted requirements is 1 MΩ.
Unit →
Min. 10 MΩ
(This is due to the presence of refrigerant, which decreases the
insulation resistance.)
(A)
Locking (intrusion of foreign objects, galling, etc.)
(B)
Pressure rise failure (damaged valve, seal, bearing, or other component)
(C)
Noise (damaged stator rotor, valve, or other component)
(2) Electrical trouble →
(A)
Coil burning
(B)
Open circuit
(C)
Insulation failure
(D)
Short circuit
Trouble diagnosis is based on the following remote controller displays:
Reference:
Reference: Symptoms of motor burning
1. Ground fault results in breaker operation.
2. Short circuit results in different coil resistance at different phases.
3. Open circuit
Insulation resistance (Use a DC 500 V insulation resistance meter and measure the insulation resistance
between the electrified and non-electrified parts.)
[P16] [P29]
: 1st compressor, right side when viewed from front
[P19] [P26]
: 2nd compressor, left side when viewed from front
A judgment is made based on factors that include the following: coil resistance (varies depending on the compressor),
insulation resistance, current, leakage breaker operation, oil and refrigerant fouling, odor, pressure, and noise.
NO
NO
NO
YES
YES
YES
Is there burning of the failed
compressor motor?
Go to “9-2-1. Replacing only the
failed compressor”.
Follow the instructions in
“2. Discharging Compressor Oil”
and drain the oil from the failed
compressor. Then inspect.
Go to “9-2-2. Replacing all
compressors in a failed unit”.
Follow the instructions in
“9-2-4. Dry core cleaning” and
perform dry core cleaning of the
failed outdoor unit.
Is the color
phase 4.0 or above, or is a
sharp odor present?
JUDGMENT START
Follow the instructions in “2. Discharging Compressor
Oil” and drain the oil from all compressors in the same
system. Then inspect.
Follow the instructions in “9-2-4. Dry core cleaning”
and perform dry core cleaning of all outdoor units.
Go to “9-2-3. Replacing all compressors in a system”.
Are there 2
or more outdoor units
wherethe compressor oil color phase is 4.0 or
higher or where a sharp odor is
present?