Lennox VEP034N432US User Manual page 30

5.2.1 Prepare the Test Operation and Debugging
(1) Do not connect power until all installation work is finished.
(2) All control circuits and wires are correctly and securely connected.
(3) Check whether the fixing loops for compressor foots are removed.
(4) All small pieces, especially metal chips, thread ends and forceps holder, must be removed
from the unit.
(5) Check whether unit's appearance and pipeline system has been damaged during
transportation.
(6) Calculate the quantity of refrigerant that needs to be added according to the pipe length.
Pre-charge the refrigerant. In case that the required charging quantity is not reached while
refrigerant can't be added, record the quantity of refrigerant that still needs to add and
complement the quantity during test operation. For details of adding refrigerant during test
operation, see below.
(7) After refrigerant is added, make sure valves of outdoor unit are completely open.
(8) For the convenience of troubleshooting during debugging, unit shall be connected to a PC
with applicable debugging software. Make sure unit's real-time data can be checked through
this computer. The installation and connection of debugging software can be found in the
Service Manual.
(9) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it's normally preheated. If yes, start test
operation. Otherwise, compressor might be damaged.
5.2.2 Test Operation and Debugging
Description of test operation procedures and main board display of ODU
VEP027N432US, VEP034N432US,
VEP042N432US, VEP042N432U, VEP048N432U, VEP060N432U,
—— Debugging code
Progress
Code
00
01_ Set master
unit
db
db
02_ Allocate
addresses
db
Description of each stage of debugging progress
Progress code
LED1 LED2
Display
Code
status
OF/AC
ON
/AH
On 01
On 02
On 02
Status code
LED3
Display Display
Code
status status
ON A0 ON
On OC On
On Ad Blink
On L7 Blink
26
DC Inverter Multi VRF System
Code meaning and operation
method
System is not debugged.
Hold main board's SW7 button for 5s
to start debugging. Main board will
display as said in the left. 2s later,
next step starts.
System is allocating addresses. 10s
later, display as below.
No master indoor unit. Display will
be on for 1min, during which master
IDU can be set manually. If not,
system will set the unit with
minimum IP address as the master
IDU.