Carrier 42QZA009DS-1 Service Manual page 64

36 AD value of voltage
37 EXV open angle for A indoor unit
38 EXV open angle for B indoor unit
39 EXV open angle for C indoor unit
40 EXV open angle for D indoor unit
41 EXV open angle for E indoor unit
42 Frequency limit symbol
43 Average value of T2
44 Outdoor unit fan motor state
45 The last error or protection code
17.5 Protection
17.5.1 Three minutes delay at restart for compressor.
17.5.2 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:
17.5.3 Low voltage protection
Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always
after restart the machine.
For example ,the digital display tube show "Cd", it means AD value is
205.
Actual data/4.
If the value is higher than 99, the digital display tube will show single
digit and tens digit.
For example ,the digital display tube show "2.0",it means the EXV
open angle is 120×4=480p.)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
(Sum T2 value of all indoor units)/( number of indoor units in good
connection)(cooling:T2B, heating:T2)
Fan off:0, High speed:1, Med speed:2, Low speed:3 Breeze:4, Super
breeze:5
00 means no malfunction and protection
T5
Compressor off
Frequency limit
Frequency holding
Normal
VOLTAGE
VOLT_LTM_FREQ1_ADD
VOLT_LTM_FREQ2_ADD
61
Frequency limit caused by IGBT
radiator
Frequency limit caused by PFC
Frequency limit caused by T4.
Frequency limit caused by T2.
Frequency limit caused by T3.
Frequency limit caused by T5.
Frequency limit caused by current
Frequency limit caused by voltage
No limit
The display value
is hex number. For
example, the
digital display tube
show 2A,then
Bit5=1, Bit3=1,
Bit1=1.
It means
frequency limit
caused by T4,T3
and current.