Installation Guide
3
Outdoor Unit
2
9
15
8
12
10
5
13
19
1
18
4
11
25
25
25
110
Suction temperature sensor failure
When the The wiring of compressor is wrong or
the connection is poor
17
16
15
Lack of refrigerant
Check if there is leakage in the unit.
m
25
Troubleshooting
CAUTION!
• THIS UNIT WILL
BE
STARTED INSTANTLY WITHOUT "ON" OPERATION WHEN ELECTRIC POWER
IS
SUPPLIED.
BE
SURE TO EXECUTE "OFF" OPERATION BEFORE ELECTRIC POWER
IS
DISCONNECTED FOR SERVICING.
• This unit has a function
of
automatic restart system after recovering power stoppage.
1. Before starting test run (for all Heat pump models)
Confirm whether the power source breaker (main switch)
of
the unit has been turned
on
for over 12 hrs to energize the
crankcase heater
in
advance
of
operation.
2.Test run
Run the unit continuously for about 30 minutes, and check the following.
• Suction pressure at check joint
of
service valve for gas pipe.
• Discharge pressure at check joint
on
the compressor discharge pipe.
• Temperature difference between return air and supply air for indoor unit.
Flash times
of
LED
Trouble description
on mainboard
Analyze and diagnose
Eeprom failure Outdoor main board eeprom fail
1PM
failure
1PM
failure
Communication error between main board and
Communication fail over 4min
sodu module
SPDU Communication error
High pressure protection System high pressure over 4.
Mpa
Compressor discharging temperature protection Compressor discharging temperature over centigrade
Abnormal
of
DC mater Jam of DC motor
or
motor failure
Abnormal
of
piping sensor Piping sensor short-circuit
or
open-circuit
Abnormal
of
outdoor ambient sensor Outdoor ambient sensor short-circuit or open-circuit
Abnormal
of
compressor discharge sensor
Compressor discharge sensor short-circuit
or
open-circuit
Communication
error
between indoor and
Communication fail over 4min
outdoor unit
Alarm and stop
if
detect
T <=
last
for
1 min
after
4-way valve reverse failure
compressor has started for
1 0min
in
heating mode, confirm
the failure
if
it appears 3 times
in
one hour.
Compressor jam(only for spdu) Inner compressor is abnormal jamed
Module PWM select circuit error Module PWM select wrong circuit
Compressor Li-phase over-current The current
of
compressor Li-phase is too high
Compressor V-phase over-current The current
of
compressor V-phase
is
too high
Compressor W-phase over-current The current
of
compressor W-phase is too high