For repairs to the refrigeration systems, (1-3) through (1-7) must be completed before performing any work on the systems. All maintenance personnel and others working in the area must be instructed in the nature of the work being performed. Where electrical components are modified, they must be fit for purpose and meet the correct specifications.
This must be reported to the owner of the equipment so that all parties are informed. Before recharging the system, it must be pressure tested with the appropriate purge gas. The equipment must be marked as having been taken out of service and emptied of refrigerant.
In addition, a set of calibrated scales must be available and in good condition. The recovered refrigerant must be returned to the refrigerant supplier in the correct recovery container and the relevant waste transfer slip arranged. The evacuation process must be carried out before the compressor is returned to the suppliers.
To accelerate this process, only electric heating of the compressor body is used.
Wireless remote controller
3 SPECIFICATIONS
3. Wired remote control (optional) for DA model, wireless remote control (supplied) for DAL model refrigerant.
SEZ-M25DA(L)
NOISE CRITERION CURVES
SEZ-M35DA(L)
SEZ-M50DA(L)
SEZ-M60DA(L)
SEZ-M71DA(L)
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW
SEZ-M25DA(L) SEZ-M35DA(L)
Seen from the direction of the arrow A) Access door 2. Access room for maintenance Indoor unit bottom. Provide sufficient access space to allow maintenance, inspection and replacement of motor, fan, drain pump, heat exchanger and electrical box in one of the following ways. Select an installation location for the indoor unit so that its maintenance access is not blocked by beams or other objects.
Access door 2 is not necessary if sufficient space is available under the unit for a maintenance person. Make access door 1 diagonally below the electrical box and access door 3 below the unit as shown in Fig. Create access door 4 under the electrical box and the unit as shown in Fig. Service access space Bottom of indoor unit.
Since the electrical wiring of the outdoor side may change, please check the electrical wiring of the outdoor service unit.
REFRIGERANT SYSTEM DIAGRAM
Heat exchanger
SEZ-M25DA(L) SEZ-M35DA(L)
7-1. CAUTIONS ON TROUBLESHOOTING
In approx. 2 minutes after startup, operation of the remote control is not possible due to system startup. Start this operation from the status of the remote control display off.), and the current operation mode will be displayed. In approx. 2 minutes after startup, operation of the remote control is not possible due to system startup.
Output pattern B] Error detected by device other than indoor unit (outdoor unit, etc.) Wireless remote controller. 1~4 Check the tube
2 Not normal if the sub remote control could not receive any signal for two minutes. 1 Abnormal if the indoor control board cannot normally receive any data from the remote control board or other indoor control board for three minutes. 1 Check for disconnection or looseness of the indoor unit or remote control transmission wire. 2 Set one of the "main" remote controls if there is no problem with the above action.
Remote control transmission error (E3)/signal reception error (E5) 1 Abnormal if the remote control cannot. found an empty transmit path for six seconds and was unable to transmit. When it becomes abnormal again, replace the internal control board. b) When "RC NG" is displayed, replace the remote control. c) When “RC E3” or “ERC 00-66” is displayed, the abnormality may cause noise. In this case, E0 is displayed on the remote control and E4 is displayed on the LED (LED1, LED2) on the external controller circuit. 3Incorrect wiring of the remote control 4Defective transmitting and receiving. remote control circuit 5 Transmission reception failure. refrigerant address "0" internal control board circuit.
3 Check the room temperature display on the remote control and the temperature of the inner tube
7-4. TROUBLESHOOTING BY INFERIOR PHENOMENA
7-5. TEST POINT DIAGRAM
SEZ-M35DA(L) SEZ-M50DA(L)
Do not pull out the connector (CNMF) for the motor while the power is on. This causes problems with the indoor controller circuit board and the fan motor.) Self-check. NG Wiring contact check Contact of fan motor connector (CNMF) Check the fuse (FUSE) on the controller board of the indoor unit. Check power supply (Remove the connector (CNMF)) Measure the voltage on the indoor controller PCB.
Check method of DC fan motor (fan motor / indoor controller circuit board)
- Thermistor (Intake air)
- Drainpan
- Thermistor (Condenser / evaporator) (Liquid pipe)
- Heat exchanger
Remove the control box cover following the procedure in section 1. 1) Pull out the thermistor holder (B) and thermistor (C) on the control box. Removing the filter and the bottom plate (1) Push up on the tab on the filter and pull it out. filter in the direction of the arrow 1. 2) Remove the fixing screws on the bottom plate (D), (E) to remove it. To avoid dew condensation, use insulated screws in the places circled in Fig.
Removing the fan motor and the Sirocco fan (1) Remove the two motor fixing screws. remove the motor and the Sirocco fan in the direction of arrow 3. 2) Remove the four fan case fixing screws to take off the top half of the fan casing. Removing the fan shroud (bottom half). 1) Push the tabs on the fan casing to remove it in the direction of arrow 2. Removing the filter and the bottom plate (1) Push down the tab on the filter, and pull out. the filter in the direction of the arrow 1. 2) Remove the fixing screws on the bottom plate.
Remove the drain pan according to the procedure in section 3. Remove the heat exchanger cover according to the procedure in section 4. 1) Remove the two fixing screws on the cover (L) to remove it.
