Daikin GYEQ20AN Service Manual page 99

SiAUY361411EA
External Filter Clogging Judgment
If "Cannot become cool/warm" trouble occurs during the test run, the external filter may be clogged.
In this case, check the pressure difference from the servicing ports on the upstream and downstream
of the external filter for the gas pipe.
If the pressure difference is 0.2 MPa or more during operation, it means the external filter is clogged
and needs to be replaced.
The heat insulator in the upper portion of the servicing port can be removed along the roulette.
For the fluid pipe external filter, check the temperature difference between the upstream and
downstream of the filter (surface).
If the temperature difference is 5 ºC or more during operation, it means the external filter is clogged
and needs to be replaced.
[Replacing the external filter]
1. Close the fluid side closing valve.
2. Perform pump down operation (special operation mode: CH10 from onboard checker).
3. After pump down is complete, close the gas side closing valve.
4. Recover the remaining refrigerant.
5. Replace the filter (fluid pipe, gas pipe) and gasket (gas pipe only) and perform evacuation after air
tightness check.
Be careful of the direction of the external filter for the gas pipe.
6. When refrigerant is charged to the fluid pipe and cannot be charged completely, charge the refrigerant
using "Additional Refrigerant Charging Mode" (special operation mode: CH14 from onboard checker).
7. Replace the heat insulator and return the racking, etc.
(Cap tightening torque: 11.8 ~ 14.7 N•m)
Confirmation after Operation
To test run operators
(1) Explain the operations of the product and cautions on safety to customers.
(2) After the test run and confirmation of normal operation, hand this instruction manual to customers.
Device Overview
Servicing port
External filter for gas pipe
2 How to Perform a Test Run
Roulette
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Test Run Manual
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