Pioneer WT009GLFI22HLD User manual

Air Conditioner Service Manual
0
Multi Inverter air conditioner
Service Manual
Models
CONTENTS
1. Important Notice
2. Product Dimensions
3. Refrigeration cycle diagram
4. Operation details
5. Wiring diagram
6. Precaution
7. Names of parts
8. Installation
9. Trouble shooting
WT009GLFI22HLD
WT012GLFI22HLD
WT018GLFI22HLD
WT024GLFI22HLD
YN020GLFI22M2D
YN030GLFI22M3D
YN040GLFI22M4D

Air Conditioner Service Manual
1
1. Important Notice
This service manual is intended for use by individuals possessing adequate
backgrounds of electrical, electronic and mechanical experience. Any
attempt to repair the appliance may result in personal injury and property
damage. The manufacturer or seller cannot be responsible for the
interpretation of this information, nor can it assume any liability in
connection with its use.
The information, specifications and parameter are subject to change due to
technical modification or improvement without any prior notice. The
accurate specifications are presented on the nameplate label.
How to order spare parts
To have your order filled promptly and correctly, please furnish the following
information:
1. Model No. with Indoor or Outdoor
2. No. in the Explosion View
3. Part Name
4. The quantity you ordered

Air Conditioner Service Manual
3
3. Refrigeration cycle diagram
TIN1 PMV1
TIN2
TIN3
PMV2
PMV3
PMV4
TIN4
T2B1
T2B24
T2B3
T2B4 ST
CONDENSER
liquid
storage
pot
T3
T4
TP
HP
COMPRESSOR
Optional
Evaporator

Air Conditioner Service Manual
5
Electronic Controller
1. Safety Protection
(1) Time Delay for Safety protection
3 minutes delay for compressor ---The compressor is ceased for 3minutes before restarting
to balance the pressure in the refrigeration cycle in order to protect the compressor.
150 seconds delay for 4-way valve---The 4-way valve will be ceased for 150 seconds
late after compressor to prevent the refrigerant-gas abnormal noise when the HEATING
operation is OFF or switch to the other operation mode.
(2) Discharge temperature protection
There is a temperature sensor on discharge pipe, when temperature on discharge pipe
exceeded the limit 115℃, system control will shut down the compressor and the display board
will show the error code.
(3) Lower voltage protection
WhenAC voltage <160V, DC voltage<170V, unit will be shut down for protection and recover while
theAC voltage ˃170 V, DC voltage ˃190V.
(4) Over voltage protection
When AC voltage ˃275V, DC voltage ˃400V unit will be shut down and recover while AC
voltage<255V, DC voltage<390 V.
(5) Over current protection
When the current of outdoor unit is overload, controller will drop the operation frequency or shut
down the unit immediately and show error code.
(6) Condenser temperature protection
When condenser temperature≥65℃and keep 10s, the air conditioner will shut down, and
show error code, and recover while condenser temperature<52℃and the compressor stop for
3minutes.
(7) IPM module protection
IPM module has high temperature & over current protection itself, if there is signal feedback to
IPM, the outdoor unit will shut down, LED on outdoor PCB will show the error code.
(8) Evaporator freeze protection.
When evaporator temperature<2℃, the controller will drop compressor operate frequency.
When evaporator temperature<0℃and keep 1 minute, the expand valve of the unit will stop.
When all of the operating unit enter freeze protect, the compressor will stop and recover while
evaporator temperature and stop for 3 minutes.
2. “Feel” Mode Operation
(1) When the “Feel” mode is selected, the operation mode and initial temperature set are
determined by the initial room temperature at start-up of the operation except to turn off the air
conditioner and operates it again.
(2) If the unit have activate the AUTO restart, when the power off and supply again, the unit will
judge the condition again and enter the “Feel” mode.
(3) If the mode is change to “Feel” from other mode, the “Feel” mode doesn’t operate until
compressor stop for more than 3 minutes.
Mode
Initial Room Temperature
Initial Set Temperature
COOLING
RT=26℃
23℃
DRY
26℃>RT≥20℃
RT-2℃
HEATING
RT<20℃
23℃
Fan
RT<20℃
RT

Air Conditioner Service Manual
6
In the “Feel” mode, when the controller receives the up or down signal of temperature, the set
temperature can adjust by 1℃upper or lower. The biggest you can adjust by 2℃upper or lower.
3. “COOLING” Mode Operation
(1) Compressor frequency control
According to difference room temperature and set temperature (δt = RT-ST), running frequency
of compressor is controlled by electronic controller. When room temperature is much higher than
set temperature, the compressor will start at a high frequency, and as room temperature goes
down, the compressor running frequency will go down. When room temperature is lower than set
temperature, the compressor will run at very low frequency. In general, unit will change its running
frequency according to δt to make room temperature closing to set temperature.
(2) Outdoor temperature affects running frequency of the compressor
Outdoor temperature affect compressor’s running frequency. Difference inlet temperature of
outdoor unit is adapted by difference compressor running frequency. While outdoor temperature is
about 30℃, the compressor will run in high frequency.
If unit run in “cooling” mode and outdoor temperature is less than -2℃,the controller will shut
down compressor and show error code, while the ambient temperature is over 1℃, the compressor
will run automatically.
(3) Auto fan control in cooling mode
In cooling mode (include cooling in “Feel” mode), fan speed is determined by δ t, as the
following diagram:
4.“DRY” Mode Operation
(1)The system for DRYoperation used the same refrigerant circle as the cooling one.
(2)When the system operates in DRY mode, at first it operates in cooling mode, the set
temperature (ST) is “RT-2℃”. After that, the system will operate in cooling mode with
lowest fan speed. During the course of this operation, you can’t use remote controller to adjust
the fan speed but you can control the vane direction.
(3)In the dry mode, when RT≤12℃, the compressor will stop and operates again at RT≥14℃.
5. “HEATING” Mode Operation (available for Heat Pump only)
(1) Frequency control
Same as the frequency control in cooing mode, the running frequency of compressor is
controlled by controller. Unit change its running frequency according to δ t to make the room
temperature closing to the set temperature.
(2) Indoor fan motor control
1) ColdAir Prevention Control
The function is intended to prevent cold air from being discharged when heating mode
selected or while in defrosting.
The indoor fan speed will be controlled as following.
RT-ST
℃
4.0
3.0
1.5
1.0
δt come down
δt come up
High fan
Min fan
Low fan

Air Conditioner Service Manual
7
In heating operation, if air conditioner turn off, the indoor fan motor will run most for 30
seconds since the stop of compressor.
2) Auto fan control (heating)
In heating mode (include in “feel” mode) , fan speed is determined by δtas the following:
(3) 4-way valve control
In heating mode, 4-way valve will power on ahead of compressor for 8seconds, and cut off
for 2 minutes later than compressor. 4-way valve will not power off unless the machine to be
switched off, mode changed or on the process of defrosting.
(4) Outdoor fan motor control
In heating mode, the outdoor fan motor will power on ahead of compressor 5 seconds, and
cut off for 30seconds later than compressor.
(5) Defrosting
Defrosting is controlled by the microprocessor.
When the unit operate 30 minutes accumulated and the compressor operation more than 3
minutes continuously, one of the following conditions is satisfied, unit comes into defrosting:
a. When FrostDeg ≥-5℃, and OPT ≤-5℃,the .2 times defrosting interval time is 45 minutes.
b. When -10℃≤FrostDeg < -5℃, and OPT < FrostDeg , the .2 times defrosting interval time is
45 minutes.
RT-ST
δt come down
δt come up
℃
Breeze
Temperature up
Temperature down
Setting
Low fan
Stop
37℃
33℃
25℃
33℃
25℃
20℃
4.0
3.0
1.5
1.0
High fan
Min fan
Low fan
Indoor pipe Temperature
3S
5S
30S
120S
ON
OFF
ON
ON
OFF
OFF
4-WAY valve
Outdoor fan motor
Compressor
5S
30S
ON
ON
OFF
OFF
Outdoor fan motor
Compressor

Air Conditioner Service Manual
8
c. When -13℃≤FrostDeg < -10℃, and OPT < FrostDeg , the .2 times defrosting interval time is
45 minutes.
d. When -15℃≤FrostDeg < -13℃, and OPT < FrostDeg , the .2 times defrosting interval time is
65 minutes.
e. When -15℃≤FrostDeg < -10℃, and OPT < FrostDeg , the .2 times defrosting interval time is
75 minutes.
f. When FrostDeg < -15℃, and OPT < -15℃, the .2 times defrosting interval time is 75 minutes.
FrostDeg = C*OAT-α
OAT: Outdoor environment temperature.
When OAT< 0℃, C=0.8, when OAT≥0℃, C=0.6
α=8
Before the air con comes into defrosting, compressor running frequency drop down to a
lower frequency firstly, then the compressor shuts down.
In defrosting, all protection function are available.
T1 T2 T3 T4 T5 T7 T8 T9 T10T6
Compressor Frequency
Outdoor Fan Motror
4-way Valve
ON
OFF
ON
OFF
ON
OFF
Defrost Hightest Frequency
T
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
Times
Drop frequency
or stop
50s
5s
5s
Rise
frequency
2-11Min
Stop
Defrost
50s
10s
Rise frequency
In defrosting, LED showing by winking.
No matter what AC come into or out of defrosting, indoor fan motor speed is the same as
Cold Air Prevention Control.
While one of the following conditions is satisfied, unit comes out of defrosting and shifts to
heating mode:
a. Outdoor coil Temperature (OPT) >5℃and keeps 30 seconds.
b. Outdoor coil Temperature (OPT) >10℃and keeps 2 seconds.
c. Continue 11minutes defrost Operation.
(5) Indoor exchanger overheat protection
When Indoor exchanger Temperature (IPT) is higher than 54℃, unit comes into indoor exchanger
overheat protection. The compressor drops its frequency.
If IPT≥65℃and keep for 30 seconds, control system shut down compressor, and recover while IPT
drop less than 52℃.
5. “SLEEP” mode
When the SLEEP button is pressed, theAC operates as following:
The indoor fan speed is set at low speed, the power lamp and the sleep lamp is on,
the display of temperature will close after 30 seconds.
When selecting COOLING/DRY operation with SLEEP mode, the set temperature will be
raised by 1℃1 hour later and by 2℃2 hour later, after 3 hours, the set temperature will be
raise by 3℃and keeps 2hours. And then the temperature is Set+2℃, after 1 hour, the

Air Conditioner Service Manual
9
temperature is set temperature and keep.
When selecting HEATING operation with SLEEP mode, the set temperature will be dropped
by 1℃1 hour later and 2℃2 hours later, after 3 hours, the set temperature will be dropped by
3℃and keep 2 hours.And then the temperature is Set-2℃, after 1 hour, the temperature is
set temperature and keep.
6. EMERGENCY Operation
When the EMERGENCY Operation switch is pressed, “Beep”a short sound, COOLING mode
is selected, two short sound the HEATING mode selected, and a long sound the unit off of 3s.
During the unit operation in emergency operation, when the unit receive the signal of remote
controller, the unit will operates by remote.
When the remote controller missing, failed or the batteries run down, press the EMERGENCY
Operation switch on front of the indoor unit for function test.
NOTE: Do not press the EMERGEMCY Operation switch during normal operation.
7. AUTO-RESTART Function (Option)
While air conditioner is operating in one mode, all of its operation data, such as working
mode, preset temperature etc. would be memorized into IC by main PCB. If power supply cut off
due to reasons and recover again, the AUTO-RESTART function will set synchronously and
the air conditioner would work at the same mode as before.
Auto-restart Pre-setting (optional):
IfAuto-restart function is needed, follow the steps below to activate this function:
1) Pulling the air-con's plug out of socket.
2) Pressing and holding the Emergency button (ON/OFF) on the indoor, then insert the plug
into the socket again.
3) Keep pressing the Emergency button for more than 10 seconds until three short beeps
heard, the Auto-restart function been activated.
4) When the unit in operation, press the timer button 10 times in 8s, the Auto-restart
function will be active，if the Auto-restart is active, the Auto-restart off.
8. Water pump control(cassette and duct type)
When the unit operates in cool or dry mode, the water pump operates, once the compressor
off or change to other mode, the water pump stop after 10 minutes.
Anytime, when the unit check the water full, the water pump operates, the unit stop and
display the water full code. When the water full eliminate, the water pump will stop after 10
minutes.
When check the water pump switch open for 8 seconds continuous, enter water full
protection, and check the water pump switch on for 180 seconds continuous, the water full
protection exit.
9. Protection and Failure Display
When protection display is available, controller will show error code, digital LED shows
error code and setting temperature by turns.
If there is more than one failure, it will show error codes according to the error list sequence.
To insure the signal communication of indoor and outdoor unit, any failure code relates to
outdoor unit will remain display for 2 minutes maximum after it’s recovered.
Among all the failure codes, sensor failure can be recovery automatically once it comes normal.