Check Items For Service; For Troubleshooting; Precautions For Service - Daikin RTSQ20PY1 Service Manual

Check Items for Service

1. Check Items for Service

1.1

For Troubleshooting

1.1.1 Initial Check and Fault Diagnosis
1. Thoroughly check for requests/complaints of users.
2. Check for statuses in which faults occur through hearings from users.
3. Check whether or not any "malfunction code" is displayed on the remote controller.
4. If no malfunction code is displayed, carry out a fault diagnosis with reference to information
1.1.2 Taking Countermeasures
1. According to the result of fault diagnosis, rectify the fault or replace the faulty part(s).
2. To conduct dismounting work, turn OFF all power supplies, and then wait for a lapse of 10
3. To replace any part in the refrigerant circuit, be sure to recover refrigerant beforehand.
1.1.3 Check after Taking Countermeasures
1. After the completion of rectifying the fault, run the system to ensure that it is definitely
2. Record the results of checks to explain them to user.
1.2

Precautions for Service

To conduct service, pay careful attention to the precautions shown below.

1.2.1 Precautions for Service

Before conducting service, touch a metal part with no paint coating applied (e.g. the lid of switch
box for standard units, or bolts that fix the switch box for Salt damage resistant and serious salt
damage resistant units) to eliminate static electricity.
1.2.2 Precautions for Access Lid for Service
Be sure to close the access lid for service after the completion of service.
(Not doing so will cause water or foreign matter to enter the unit, thus resulting in failures.)
1.2.3 Precautions for Service in Switch Box
1. Do not open the lid of the switch box for a period of 10 minutes after turning OFF the power
2. After opening the lid of the switch box, make measurement of voltage between the terminals
3. To prevent a failure of PCBs, be sure to touch the ground terminal in the switch box by hand
4. Disconnect the junction relays X1A, X2A, X3A, and X4A (X3A and X4A are only equipped on
197
(Or check whether or not any malfunction is caused in the monitor mode of outdoor unit.)
in the "Symptom-based Troubleshooting" section.
If any "malfunction code" is displayed, carry out a fault diagnosis with reference to
information in the "Troubleshooting Flowchart" section.
minutes or more.
normal.
supply.
of the power supply terminal block by the use of a multiple meter.
Then, make voltage measurement in the points shown in the figure on the following page by
the use of a multiple meter to ensure that the voltage of the main circuit capacitor is not more
than 50VDC.
right before disconnecting and connecting a connector to eliminate static electricity from the
body.
systems with two outdoor units) from the outdoor unit fan motors, and then commence
service work.
When disconnecting the junction connectors, pay careful attention not to touch a live part.
(Rotating the outdoor unit fan due to the strong wind may store electricity in the main circuit
capacitor, thus resulting in an electric shock.)
↓
SiBE31-801_C
Troubleshooting