Samsung Electronics 278
9-1 Auto Trial Operation
9-1-1 Overview of Auto Trial Operation
1) What is the Auto Trial Operation?
Auto Trial Operation is an operation mode designed to provide guidelines for inspecting the status of the device installation and the
main components
for quick and accurate troubleshooting. If Auto Trial Operation is not performed, it is not possible to start general
operation due to UP (Un Prepared) mode.
2) Preliminary inspection before Auto Trial Operation
(1) Pr
eliminary inspection before Auto Trial Operation (service valve) on the outdoor unit is opened.
(2) Indoor: Check the communication and power lines related
to the outdoor air.
(3) Turn on the system 6 hours before Auto Trial Operation to sufficiently preheat the compressor.
(4) Before connecting the power
supply, use a voltmeter and phase tester to check the voltage and phase.
- R, S, T, N terminals: Make sure that the turn-to-turn volt
age is 380-415V (R-S, S-T, T-R) and the phase-to-phase voltage is
200-240V (R-N, S-N, T-N).
(5) After the power supply is connected, configure devices s
uch as indoor units and MCUs connected to the outdoor unit,
and optional settings.
After the required settings are configured, the communication
status between the outdoor unit and the connected devices is
checked. The outdoor unit then displays "UP" (Un Prepared).
ఐ
Display :
After Auto Trial Operation, the outdoor unit repeatedly displays the addresses of the connected devices. (See Chapter 8.)
(6) Record installation detai
ls in the installation check card attached on the front of the control box.
(7) Be sure to close the frontal cabinet on the outdoor unit before starting
operation.
Operation with the frontal cabinet opened may damage the system and degrade the inspection accuracy.
3) What is checked during Auto Trial Operation
- Outdoor unit’s thermistors (EVA In/Out and indoor thermistors on each indoor unit)
- Outdoor unit’s thermistors (Cond_Out, EVI In/Out, Suction, liquid line
thermistors and outdoor (or water temp) thermistors
on each outdoor unit)
- Outdoor unit’s high pressure and low pressure sensors
- Whether the out
door unit’s ball valve (service valve) is opened or closed is checked
- Operation electric current on the outdoor unit’s compressor is checked
- Outdoor
unit’s CYCLE status is checked
- Outdoor unit’s 4-way valve operation related to outdoor air is checked
- Outdoor unit’s EVI EEV operation is checked
-
Outdoor unit’s Main EEV operation is checked
( ఐ Checked only if “heating” mode is on during Auto Trial Operation)
9. Test Operation
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