50
Description of each stage of
Commissioning Cycle
progress
——
Cycle
code
Progress
code
Status code
Meaning
progress
LED1
LED2
LED3
Code Display
status code
Display
status Code
Display
status
db
light
07
light
OC
light No error in indoor components.
Start next
step
.
08_Confirm
preheated
compressor
db
light
08
light
U0
light Preheat time for compressor is less than 8h.
db
light
08
light
OC
light Preheat time for compressor is 8h.
Start next
step
.
09_Refrig
.
check
before startup
db
light
09
light
U4
light
System refrigerant is not enough. System
downtime equilibrium pressure is lower than
0.3MPa(4-2/5psig).
db
light
09
light
OC
light System refrigerant is normal.
Start next
step
.
10_Status
judgments of
outdoor
valves before
startup
db
light
10
light
ON
light Outdoor valves are
fully open
db
light
10
light
U6
light Outdoor valves are
closed or not fully open
db
light
10
light
OC
light Outdo
or valves open. Start next step.
11_Calculate
refrigerant
quantity
manually
db
light
11
light
AE
light
Calculate the refrigerant quantity manually and
confirm the
charge
status of refrigerant (the
quantity of refrigerant added into the system
must be recorded accurately).
If no previously charged, do so on this step.
12_Confirm
test run
db
light
12
light
AP
blink Ready for
test run
.
db
light
12
light
AE
light Manual calculation of refrigerant quantity is
set up.
13_
—— —— —— —— —— ——
step disabled
.
14_
—— —— —— —— —— ——
step disabled.
15_Cooling
test run
db
light
15
light
AC
light Debugging is enabled in cooling mode
(debugging mode, auto-selected by system).
db
light
15
light Error
code light
Error occurs during
test run
in cooling
mode.
db
light
15
light
J0
light Error of other modules occurs during
test run
in cooling mode.
db
light
15
light
U9
light Outdoor pipeline and valves are not normal.
Lennox
VRF Unit
