Ecoer EODA18H-2436 User manual

ESI(Ultra) Service Manual
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ESI(Ultra) Unitary System
Service Manual
Contents
1. General Information------------------------------------
2. ESI(Ultra) Unitary System---------------------------
2.1 Refrigerant Circuit----------------------------------
2.2 Function and Control------------------------------
2.3 Field Setting-----------------------------------------
3. Troubleshooting---------------------------------------
4. Appendix------------------------------------------------
4.1 Sensor Characteristics-------------------------------
4.2 Wiring Diagram-------------------------------------
2
3
3
7
17
25
57
57
61

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1 General Information
E OD A 18 H - 4860
1 2 34 56
Brand
E: Ecoer
Product Series
OD: Outdoor Condensing Unit
Model Letters
A: 208/230V-1Ph-60Hz
SEER
18: 18SEER Series
Type
H: Heat Pump
C: Cooling only (Dial SW1_3 to ON)
Capacity
2436: up to 3Ton; 4860: up to 5Ton.
Condensing
Unit
E AH A T N - 24
1 2 34 56
Brand
E: Ecoer
Product Series
AH: Indoor Air Handler
Model Letters
A: 208/230V-1Ph-60Hz
Expansion device
T: TXV
Communications
N: 24V Normal
Capacity
24=24000BTU/h=2Ton; 36=36000BTU/h=3Ton;
48=48000BTU/h=4Ton; 60=60000BTU/h=5Ton.
E series Air
Handler

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2.1 Refrigerant Circuit
2.1.1 Functional Parts Layout of Condensing Units
2 ESI(Ultra) Unitary System
TH
TL
TS
TD
TA
Inverter Fan
Main Control Board(PCB)
Accumulator(ACC)
Noise Filter
Inductance Fan Blade
Heat
Exchanger
Liquid/Gas Service Valve
Inverter Compressor(INV)
4-Way Valve(ST1)
Electronic Expansion
Valve(EEV)
Strainer Gauge Port
High Pressure
Sensor(HP) Low Pressure
Sensor(LP)
Lower Side Plate

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TS
TD
TATA
Inverter Fan(FAN)
Main Control Board(PCB)
Accumulator(ACC)
Noise Filter
Inductance
Fan Blade Heat
Exchanger
Liquid/Gas Service Valve Inverter Compressor(INV)
4-Way Valve(ST1)
Electronic Expansion
Valve(EEV)
Strainer Gauge Port
High Pressure
Sensor(HP) Low Pressure
Sensor(LP)
Lower Side Plate
TH
TL
TIPS:
Remove 5 screws to take away the lower
side plate to access TH/TL sensor.
A slotted screwdriver may be required to
open the plate from the condensing unit.

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2.1.2 Major Components Functions and Refrigerant Circuits Diagram
HP
TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Service Valve
Heat Exchanger
Gas Service Valve
Gauge Port
FAN
LP
Name Symbol Function
Inverter compressor INV Adjusts refrigerant flow rate by changing the frequency(RPS) based
on objective pressure.
Inverter fan FAN Outputs heat exchanger capacity by adjusting the motor rotation
speed based on operating pressure.
Electronic expansion
valve EEV 1) Fully open during cooling mode and defrost operation.
2) Control compressor discharge superheat in heating mode.
4-way valve ST1 Switches the operation mode between heating and
cooling (including
defrost control).
Thermistor
TH Uses to control defrosting during heating operation.
TA Uses to detect outdoor air temperature and control fan speed.
TS Uses to detect compressor suction temperature and calculate suction
superheat (SH).
TL Uses to detect liquid line temperature and calculate sub-cooling (SC).
TD Uses to detect compressor discharge temperature and calculate
discharge superheat (DSH).
TF Uses to detect heat sink temperature of inverter module.
High pressure sensor HP Uses to detect high pressure.
Low pressure sensor LP Uses to detect low pressure.
Accumulator ACC Uses to store excess refrigerant.

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Cooling Operation (including defrost operation and cooling oil return)
HP
TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Service Valve
Heat Exchanger
Gas Service Valve
Gauge Port
TXV
Heat Exchanger
High pressure Gas
High pressure Liquid
Low pressure Gas
Low pressure Mix.
FAN
LP
Heating Operation (including heating oil return)
HP TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Service Valve
Heat Exchanger
Gas Service Valve
Gauge Port
TXV
Heat Exchanger
High pressure Gas
High pressure Liquid
Low pressure Gas
Low pressure Mix.
FAN
LP
2.1.3 Refrigerant Flow of Each Operation Mode
Strainer
Strainer

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2.2 Function and Control
2.2.1 Operation Mode
Remarks:
The operation may be enforced to complete under some conditions.
Operation in stop mode
Pressure equalizing
prior to start-up
Thermostat ON (Y=ON)
•Thermostat OFF
(Y=OFF)
•O signal change
Start-up control *NOTE
・Cooling start-up
(O=ON)
・Heating start-up
(O=OFF)
Cooling or heating
operation
Oil return IN
conditions are met.
Defrost IN
conditions are met.
NO
NO
Oil return operation *NOTE
YES
Defrost operation *NOTE
YES
Normal operation
•Compressor PI control
•EEV PI control
•Fan motor control
•Protection control
Restart standby
(compressor stops)
Malfunction
MAX. 6 minutes
After 1 minute

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2.2.2 Basic control
Signal Actuator Operation Remark
Y Compressor (INV)
Apply Compressor PI control
to maintain Tes*1
according to
load of the space.
Pressure protection control,
Discharge temperature protection control,
Compressor operating frequency upper limit
control with inverter protection control.
Y/O Outdoor fan (FAN) Cooling fan control -
O=ON *2 Four way valve (ST1) De-energized -
Y/O Electronic expansion
valve (EEV) 480pls -
2.2.2.1 Cooling control (including cooling oil return)
Signal Actuator Operation Remark
Y Compressor (INV)
Apply Compressor PI control
to maintain Tcs*1 according to
load of the space.
Pressure protection control,
Discharge temperature protection control,
Compressor
operating frequency upper limit
control with inverter protection control.
Y/O Outdoor fan (FAN) Heating fan control -
O=OFF Four way valve (ST1) Energized -
Y/O Electronic expansion
valve (EEV)
PI control to maintain
discharge superheat -
2.2.2.2 Heating control (including heating oil return)
Remarks:
1. Tes: Target Te value (Varies depending on mode choice, silent setting, etc.)
Te: Low pressure equivalent saturation temperature(F)
2. SW1_3=OFF(factory), condensing unit uses Y/O/C signal to operate heat pump function.
SW1_3=ON has been set, condensing unit uses Y/C signal to run cooling only.
Remarks:
1. Tcs: Target Tc value (Varies depending on mode choice, silent setting, etc.)
Tc: High pressure equivalent saturation temperature(F)
2.2.2.3 Defrost control
During low ambient temperature heating operation, the outdoor heat exchanger may be covered by
frost resulting in heating capacity reduction. The system will carry out defrost control
automatically if any of the following conditions satisfy.
•TH, the defrost temperature sensor, becomes lower than deicer*1 temperature.
•The high pressure related to ambient temperature or running time is lower than specific value.
Ecoer offers three defrost setting options(n04) designed for different humidity areas. Manual
defrost can be chosen from n08 setting*2. For more details, refer to field setting section.
Defrost will be terminated once the defrost temperature sensor(TH) reaches target value or the
defrost time has exceeded eight minutes.
Remarks
1. This is a specified temperature related to ambient temperature for the system to activate the
defrosting operation.
2. Start-up control is enforced to complete prior to activate the defrost operation.

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2.2.2.4AUTO charge mode and pump down function
Actuator AUTO charge mode
in cooling
Pump down in
heating Remark
Compressor(INV)
2ton: 56rps→26rps
3ton: 66rps→36rps
4ton: 56rps→26rps
5ton: 66rps→36rps
2ton: 66rps→26rps
3ton: 80rps→36rps
4ton: 58rps→26rps
5ton: 70rps→36rps
Protection control is valid
during this process. *Low
pressure protection is valid if
LP <24.5psig.
Outdoor fan(FAN) Cooling fan control Heating fan control -
Four way valve(ST1) De-energized Energized -
Electronic expansion
valve(EEV) 480pls PI control to maintain
discharge superheat -
AUTO charge mode locks the compressor frequency in cooling. The LED will display the
refrigerant coefficient if both the liquid line sub-cooling and compressor suction superheat of ESI
system are proper. To keep the best Ecoer Smart Inverter(ESI) systems’ performance and
reliability, the following requirements should be followed in cooling.
•If the LED displays “--” in AUTO charge mode for more than 20 minutes, stop charging and use a
wrench to clockwise the TXV to ensure SH is no less than 7゜F.
•In case that the cooling performance is abnormal due to improper superheat (i.e. SH >20゜F).
Adjust the system according to
1. Activate AUTO charge mode from outdoor condensing unit to fix compressor
frequency(RPS) by press BS4 for 5 seconds on PCB. Run the system for 15~20 minutes
and check refrigerant coefficient number from the LED display, add refrigerant until the
LED displays 0.6.
2. Adjust TXV opening to allow more refrigerant flow into indoor coil if SH is still larger than
20゜F. Open the front panel of the indoor unit, then remove the TXV nut and use a wrench
to counterclockwise the TXV until SH ≤ 20゜F.
SH
7~20゜F
SC
6~18゜F
Target values
in cooling mode
Pump down locks the compressor frequency in heating.
Hold and press BS4 button for 5 seconds after set heating
mode from thermostat, press BS2 button in one minute to
enter pump down function. The low pressure will be displayed
on the LED of main control board.
SEG1 SEG2 SEG3
SEG1 SEG2 SEG3
BS1 BS2 BS3
BS4
NOTE: The liquid service valve has to be locked prior to do pump down operation.

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2.2.2.6 Fan control
Start-up control
Pressure control
Directive control
•Cooling fan control by high pressure
•Heating fan control by low pressure
Fixed rotation speed
Standby after
getting start signal
MAX STEP •Cooling fan control by high pressure
•Heating fan control by low pressure
[FAN RPM STEP]
STEP RPM STEP RPM STEP RPM STEP RPM STEP RPM
0 0 2 450 4 680 6 830 8 930
1 350 3 550 5 780 7 880 9 980
2.2.2.5 Compressor control
[Compressor RPS STEP]
STEP RPS STEP RPS STEP RPS STEP RPS STEP RPS
1 - 9 28 17 44 25 60 33 76
2 - 10 30 18 46 26 62 34 78
3 16 11 32 19 48 27 64 35 80
4 18 12 34 20 50 28 66 36 82
5 20 13 36 21 52 29 68 37 84
6 22 14 38 22 54 30 70 38 86
7 24 15 40 23 56 31 72 39 88
8 26 16 42 24 58 32 74 40 90
Start-up control
PI control
Directive control
•Pressure differential control
•MAX time (cooling) ≤ 10 minutes
•MAX time (heating) ≤ 45 minutes
Fixed speed
Depending on the load of the space.
Standby
MAX 6 minutes for pressure
equalization
Outdoor Model 2Ton 3Ton 4Ton 5Ton
Cooling Max RPS 70 80 66 76
Heating Max RPS 80 90 80 90

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2.2.2.8 Silent mode
In order to decrease the noises produced by condensing unit, the crucial noise resources should be
limited. Once the silent mode has been activated by n05~n07 (refer to field setting), both the
highest compressor frequency(RPS) and fan speed(RPM) are limited.
Max Compressor RPS
Condensing Unit Standard Mode Silent Mode (Level 1) Super Silent Mode (Level 2)
2Ton 80 70 60
3Ton 90 78 72
4Ton 80 62 52
5Ton 90 70 60
Max Fan Speed (RPM)
Condensing Unit Standard Mode Silent Mode (Level 1) Super Silent Mode (Level 2)
2Ton 830 680 550
3Ton 930 780 680
4Ton 880 830 780
5Ton 980 880 780
Max Compressor RPS
Condensing Unit Standard Mode Silent Mode (Level 1) Super Silent Mode (Level 2)
2Ton 70 66 56
3Ton 80 76 70
4Ton 66 66 56
5Ton 76 68 58
Max Fan Speed (RPM)
Condensing Unit Standard Mode Silent Mode (Level 1) Super Silent Mode (Level 2)
2Ton 830 680 550
3Ton 930 830 680
4Ton 880 830 780
5Ton 980 880 780
Cooling Operation
Heating Operation
2.2.2.7 Electronic expansion valve(EEV) control
Start-up control
PI control
Directive control
•Cooling: 480pls
•Heating: Temperature differential control
Fixed opening
Standby after
getting start signal
•Cooling: 360pls→480pls
•Heating: 360pls→0pls •Cooling: 480pls
•Heating: Depending on the compressor
discharge superheat.

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2.2.3. Protection controls
HP≥C
Normal operation
(Upper limit compressor step=Max.step)
HP<D
Upper limit compressor
step: Decrease 2step
Current step maintained
After 15 sec.
HP≥A
High pressure abnormal standby
HP≥B
Upper limit compressor step=Current step
HP≥B
Compressor restarts
HP<D
Value setting
EODA18H-2436/4860
Cooling Heating
A 566psig [3.9MPa] 566psig [3.9MPa]
B 493psig [3.4MPa] 479psig [3.3MPa]
C 479psig [3.3MPa] 450psig [3.1MPa]
D 464psig [3.2MPa] 421psig [2.9MPa]
2.2.3.1 High pressure protection control
High pressure(HP) protection control is used to prevent extremely high pressures in the system
and protect the compressor.
Restart permission=ON
and
HP<D

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LP<C
Normal operation
(Upper limit compressor step=Max.step)
LP≥D
Upper limit compressor
step: Decrease 2steps
Current step maintained
After 15 sec.
LP<A
Low pressure abnormal standby
LP<B
Upper limit compressor step=Current step
LP<B
Compressor restarts
LP≥D
Value setting EODA18H-2436/4860
A 24.5psig [0.17MPa]
B 43.5psig [0.30MPa]
C 61.0psig [0.42MPa]
D 72.5psig [0.50MPa]
2.2.3.2 Low pressure protection control in cooling mode
Low pressure(LP) protection control in cooling is used to protect compressor against the transient
decrease of low pressure.
Restart permission=ON
and
LP≥D

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2.2.3.3 Discharge temperature protection control
This discharge temperature(TD) protection control is used to protect the compressor internal
temperature against a malfunction or transient increase of discharge pipe temperature.
TD≥C
Normal operation
(Upper limit compressor step=Max.step)
TD<D
Upper limit compressor
step: Decrease 2steps
Current step maintained
After 15 sec.
TD≥A
Discharge temperature abnormal standby
TD≥B
Upper limit compressor step=Current step
TD≥B
Compressor restarts
TD<D
Value setting
EODA18H-2436/4860
Cooling Heating
A 248°F (120°C) 230°F (110°C)
B 230°F (110°C) 212°F (100°C)
C 212°F (100°C) 194°F (90°C)
D 194°F (90°C) 176°F (80°C)
Restart permission=ON
and
TD<D

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2.2.3.4 INV Module temperature protection control
Inverter module temperature (TF) protection control is performed to prevent tripping due to an
abnormal increase in temperature.
TF≥C
Normal operation
(Upper limit compressor step=Max.step)
TF<D
Upper limit compressor
step: Decrease 1step
Current step maintained
After 15 sec.
TF≥A
Inverter heat sink temperature abnormal standby
TF≥B
Upper limit compressor step=Current step
TF≥B
Compressor restarts
TF<D
Value setting
EODA18H-2436 EODA18H-4860
Cooling Heating Cooling Heating
A 181°F (83°C) 181°F (83°C) 176°F (80°C) 167°F (75°C)
B 174°F (79°C) 158°F (70°C) 158°F (70°C) 149°F (65°C)
C 167°F (75°C) 153°F (67°C) 151°F (66°C) 142°F (61°C)
D 162°F (72°C) 147°F (64°C) 145°F (63°C) 136°F (58°C)
Restart permission=ON
and
TF<D

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2.2.3.5 Compressor over-current protection control
This control is performed to prevent tripping due to an abnormal transient compressor current (IA).
IA≥C
Normal operation
(Upper limit compressor step=Max.step)
IA<D
Upper limit compressor
step: Decrease 1step
Current step maintained
After 30 sec.
IA≥A
Inverter current abnormal standby
IA≥B
Upper limit compressor step=Current step
IA≥B
Compressor restarts
IA<D
Value setting
EODA18H-2436 EODA18H-4860
Cooling Heating Cooling Heating
A 16A 16A 20A 20A
B 9.2A 9.5A 12.1A 12.1A
C 8.6A 9.1A 11.7A 11.7A
D 8.0A 8.5A 11.2A 11.2A
Restart permission=ON
and
IA<D

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LED on main control board can display the operating state of outdoor unit (ODU).
7 segment display instructions
SEG1 SEG2 SEG3
2.3 Field Setting
2.3.1 Default display
SEG1: Normally blank, but it displays codes “1~9” accordingly if there is damaged sensor and
demand control requirement.
SEG2: Normally blank, but it will display code accordingly as below if outdoor unit is running
under limited condition.
SEG3: It displays outdoor unit’s operation mode.
State Codes Description
0 IoT software is updating
1 High pressure sensor fault backup state
2 Low pressure sensor fault backup state
3 Discharge temperature sensor(TD) fault backup state
4 IPM module temperature sensor(TF) fault backup state
5 Ambient temperature sensor(TA) fault backup state
6 Defrost sensor(TH) fault backup state
7 Suction temperature sensor(TS) fault backup state
8 Liquid line temperature sensor(TL) fault backup state
9 Demand response state
Protection State Codes Description
0 Running under high pressure limit
1 Running under low pressure limit
2 Running under discharge temperature limit
3 Running under IPM module temperature limit
4 Running under compressor current limit
State Codes Description
0 Stop without running signal (Y signal=OFF)
1 Ready to start after receiving running signal (Y signal=ON) *Note
2 Cooling mode
3 Heating mode
4 Oil return
5 Defrost
6 Manually forced defrost
7 AUTO charge assistant in cooling
8 Pump down in heating
Note: Compressor waits 3~6 minutes to restart.

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Mode list (SEG3 Display)
SEG1 SEG2 SEG3
Stop or standby without running signal (Y=OFF)
→State Code (SEG3): 0
SEG1 SEG2 SEG3
Wait to start after receiving running signal (Y=ON)
(6 minutes for pressure equalization to restart)
→State Code (SEG3): 1
SEG1 SEG2 SEG3
Cooling running
→State Code (SEG3): 2
SEG1 SEG2 SEG3
Heating running
→State Code (SEG3): 3
SEG1 SEG2 SEG3
Oil return
→State Code (SEG3): 4
SEG1 SEG2 SEG3
Defrost
→State Code (SEG3): 5
SEG1 SEG2 SEG3
Manually forced defrost
→State Code (SEG3): 6
SEG1 SEG2 SEG3
AUTO charge assistant in cooling
→State Code (SEG3): 7
SEG1 SEG2 SEG3
Pump down in heating
→State Code (SEG3): 8

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2.3.2 Setting by dip switches
2.3.3 Setting by pressing buttons
Query and setting operation can be done by pressing buttons on main control board.
SW1 dip switch Description
NO．Setting item State Content
1 Reserved - -
2 Capacity selection* ON 2 or 4 Ton
OFF(factory) 3 or 5 Ton
3 AC only/Heat pump selection ON AC only
OFF(factory) Heat pump
4 Response for IoT command ON No
OFF(factory) Yes
* Keep the factory default ODU’s dip switch when 5 Ton matches with 2 or 3 Ton indoor unit for hyper heating.
Condensing units’ functions can be applied by dipping switch and pressing buttons on the job site.
1 2 3 4
ON DIP
SW1
Use minor straight
screwdriver to dip switch.
BS1
BS1: Menu or back button
BS2: UP button
BS3: Spot check and confirm button
Remarks:
Press or tip any directions are valid.
BS2 BS3
Press buttons
Off
Blinking
On
SEG1 SEG2 SEG3
Setting mode
Default mode
(Press BS3 button to
query operating states.)
Press and hold BS1for 5 seconds
to set special functions.
Press BS3
Symbol selection by
pressing BS2 button
Setting item selection
by pressing BS2 button
Contents display
Press BS3
Press BS3
Query setting mode
Press BS3
Symbol selection by
pressing BS2 button
Contents display
Press BS3
Press BS1 once to query
current setting.
Press BS1 once

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System states can be showed on the 7 segments display of outdoor unit. Press BS3 button to get
code number and corresponding detailed information with an interval of one second.
Example: Code number Detailed information
Remark:
When multi-error codes exist at the same time, each code will be displayed one by one with an interval of one
second.
SEG1 SEG2 SEG3 SEG1 SEG2 SEG3
Default mode (Spot check)
No. Number content Example Description (Round numbers)
Default Refer to default display instructions 902
9:Demand
0:Running under high pressure limit
2:Cooling mode
01- Outdoor unit type and capacity H3 H: heat pump C: AC only
3：3Ton(2,3,4,5Ton)
02- Liquid line sub-cooling 10 10°F
03- Compressor suction superheat 18 18°F
04- Compressor speed 56 56RPS
05- Electronic expansion valve opening 360 360pls
06- Step of fan 8 The 8th step
07- Low pressure (LP sensor) 145 145psig
08- High pressure (HP sensor) 350 350psig
09- Outdoor ambient temp. (TA) 95 95°F
10- Compressor suction temp. (TS) 70 70°F
11- Compressor discharge temp. (TD) 170 170°F
12- Defrost sensor temp. (TH) 80 80°F
13- Liquid line temp. (TL) 70 70°F
14- Inverter module temp. (TF) 150 150°F
15- Target evaporating temp. (Tes) 43 43°F
16- Current evaporating temp. (Te) 43 43°F
17- Target condensing temp. (Tcs) 104 104°F
18- Current condensing temp. (Tc) 104 104°F
19- Compressor DC current 10.1 10.1A
20- Undercharged refrigerant signal 0 0: none 1: level 1 2: level 2(severe)
21- Main software version A01 A01 version
22- Inverter software version b01 b01 version
23- Current fault E1 Display up to 5 *
24- The last fault F1 --: none
25- Fault before the last fault F2 --: none