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Daikin 2MXM50M User Manual

Daikin 2MXM50M
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Page #56 background image
ESIE16-02B | Part 2. Troubleshooting 2.4. Component checklist
Page 56 4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
2.4.2.8. Refrigerant thermistors
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Locate the thermistor and check if thermal contact with the piping or ambient is ensured.
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required.
PROCEDURE
1. From the table in the appendix ("Component checklist" on page 111), select the thermistor that must be checked.
2. Measure the temperature of the thermistor using a contact thermometer.
3. Unplug the connector from the appropriate PCB and measure the resistance between the pins listed in the table in the
appendix ("Component checklist" on page 111).
- Compare the measured resistance with the range determined by the lower and higher temperature.
4. If the measured resistance does not match the listed value, the thermistor must be replaced.
E.g. R3T air thermistor - main PCB - connector S90: pin 1-2 type 1:
Measured temperature with contact thermometer: 23.1°C.
Unplug the sensor and measure the resistance between S90: 1-2: 21.86 k.
Technical specification Description
A single type of thermistor is used; the resistance vs. tempera-
ture characteristics is shown in below table "Thermistor resist-
ance / temperature characteristics (type 1)".
The thermistors are used to measure the temperature at multiple
locations inside the Daikin unit. The measured temperatures are
processed by the main board.
Location
Piping diagram Wiring diagram Switch box Component overview of unit
See "Outdoor unit" on
page 104.
See "Outdoor unit" on
page 99.
See "Outdoor unit" on
page 111.
See "Outdoor unit" on page 110.
Check procedure
Mechanical check
Electrical check
INFORMATION
If a thermistor check fails, replace the thermistor.
WARNING: RISK OF FIRE
When reconnecting a connector to the PCB, do not apply force, as this may damage the connector or connector pins of
the PCB.
INFORMATION
All thermistors have a tolerance of 5%.

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Daikin 2MXM50M Specifications

General IconGeneral
TypeAir conditioner outdoor unit
Multi-split-
Product colorWhite
Gas hose diameter9.5 mm
Drain hose diameter16 mm
Liquid hose diameter6.35 mm
Outdoor unit depth285 mm
Outdoor unit width765 mm
Outdoor unit height550 mm
Outdoor unit weight41000 g
Outdoor unit noise level486.35 dB
Outdoor unit package depth357 mm
Outdoor unit package width900 mm
Outdoor unit package height614 mm
Outdoor unit package weight43000 g
Outdoor unit sound power level62 dB
Current16 A
AC input voltage220 - 240 V
AC input frequency50 Hz

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