55
If more than 8
h
ours
of preheat time is detected, system will display as below and
start next
step
.
——
Cycle
code
Progress code Status code
Meaning
progress
LED1
LED2
LED3
Code Display
status code
Display
status Code
Display
status
08_Confirm
preheated
compressor
db
Light
08
Light
OC
Light Preheat time for compressor is 8h.
Start next
step
.
If less than 8h of preheat time is detected, system will give error alarm and display as below.
For
first startup wait until 8 hours completed.
Then press SW7 confirmation button to start next
step
.
Skipping this step
will cause force start of the compressor which may damage
it
.
——
Cycle
code
Progress code Status code
Meaning
progress
LED1
LED2
LED3
Code Display
status code
Display
status Code
Display
status
08_Confirm
preheated
compressor
db
Light
08
Light
UO
Light Preheat time for compressor is less
than 8h.
Wait until 8h completed.
Step 13:
step
09 is “Refrigerant judgments before startup”
If the refrigerant quantity inside the system meets the requirement of operation startup,
system will display as below and start next progress.
——
Cycle
code
Progress code Status code
Meaning
progress
LED1
LED2
LED3
Code Display
status code
Display
status Code
Display
status
09_Refrigerant
check
before
startup
db
Light
09
Light
OC
Light System refrigerant is normal.
Start next
step
.
If there’s no or not enough refrigerant in the system to meet the requirement of operation
startup, system will display U4 “refrigerant shortage protection” and fails to start next
step
.
Then check if there’s any leakage or add refrigerant inside until error eliminated.
——
Cycle
code
Progress code Status code
Meaning
progress
LED1
LED2
LED3
Code Display
status code
Display
status Code
Display
status
09_Refrigerant
check
before
startup
db
Light
09
Light
O4
Light
System refrigerant is not enough.
System downtime equilibrium pressure
is lower than 0.3MPa(4-2/5psig).
Step 14: progress 10 is “Status
check
of outdoor valves before startup”
Lennox
VRF Unit
