Ecoer ESI Series User manual

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ESI (Ultra) R-410A
Unitary Service Manual
Contents
1. General Information ----------------------------- 2
2. ESI (Ultra) Unitary System ---------------------- 3
2.1 Refrigerant Circuit------------------------------ 3
2.2 Function and Control-------------------------- 7
2.3 Field Setting------------------------------------- 17
3. Troubleshooting ----------------------------------25
3.1 Problems without Codes --------------------- 25
3.2 Error Codes list--------------------------------- 35
4. Parts List --------------------------------------------61
5. Appendix--------------------------------------------63
5.1 Sensor Characteristics -------------------------- 63
5.2 Wiring Diagram -------------------------------- 67
All phases of this installation must comply with National, State and Local Codes.
IMPORTANT
These instructions do not cover all variations in systems or provide for every possible contingency to
be met in connection with installing and servicing. Should further information be desired or should
particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter
should be referred to local distributor.

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1General Information
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: AC only
Capacity
2436: up to 3Ton 4860: up to 5Ton
Unit E OD A 18 H - 4860
60=5Ton48=4Ton36=3Ton24=2Ton
Brand
E: Ecoer
Product Series
AH: Indoor Air Handler
Model Letters
A: 208/230V-1Ph-60Hz
Metering device
T: TXV
Communications
N: 24V Normal
Capacity
E series
Air Handler E AH A T N - 36

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2ESI (Ultra) Unitary System
2.1 Refrigerant Circuit
2.1.1 Functional Parts Layout of Condensing Units
EODA18H-2436
Inductance Fan Blades
DC Motor (FAN) High Pressure
Sensor (HP)
Low Pressure
Sensor (LP)
Noise Filter
Heat
Exchanger
Main Control Board (PCB)
Lower Side Plate
Strainers Gauge Port
Liquid / Gas Service Valve
Electronic Expansion
Valve (EEV)
Accumulator (ACC)
Inverter Compressor (INV)
Reversing Valve (ST1)
TD
TS
TA
TH
TL

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TA
EODA18H-4860
Inductance
Noise Filter
Main Control Board (PCB)
Fan Blades
Lower Side Plate
DC Motor (FAN)
Strainers Gauge Port
Liquid / Gas Service Valve
High Pressure
Sensor (HP)
Electronic Expansion
Valve (EEV)
Low Pressure
Sensor (LP)
Heat
Exchanger
Accumulator (ACC)
Reversing Valve (ST1)
Inverter Compressor (INV)
TA
TH
TL
TIPS:
Remove screws to take away the lower
side plate to access TH / TL sensors.
A slotted screwdriver may be required to
open the plate from the condensing unit.
TD
TS

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TL EEV
FAN
TH Heat Exchanger
Gas Service Valve
ST1
Gauge Port TD
INV
TS
ACC
HP
LP
2.1.2 Major Components Functions and Refrigerant Circuits Diagram
Liquid Service Valve TA
Name
Symbol
Function
Inverter compressor INV Adjusts refrigerant flow rate by changing the compressor speed (RPS)
based on objective pressure.
DC motor 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 defrostoperation.
2) Control compressor discharge superheat in heatingmode.
Reversing valve ST1 Switches the operation mode between heating and cooling (including
defrost control).
Temperature sensor
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 compressor
suction superheat (SH).
TL Uses to detect liquid line temperature and calculate sub-cooling (SC).
TD Uses to detect compressor discharge temperature and calculate
compressor 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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2.1.3 Refrigerant Flow of Each Operation Mode
TXV Liquid Service Valve TA
TL EEV
FAN
Indoor Coil
TH Heat Exchanger
Gas Service Valve
ST1
Gauge Port TD
Strainer
High pressure Gas
High pressure Liquid
Low pressure Gas
INV
Low pressure Mix. TS
ACC
Heating Operation (including heating oil return)
HP
LP
TXV Liquid Service Valve TA
TL EEV
FAN
Indoor Coil
TH Heat Exchanger
Gas Service Valve
ST1
Gauge Port TD
Strainer
High pressure Gas
High pressure Liquid
Low pressure Gas
Low pressure Mix.
INV
TS
ACC
Cooling Operation (including defrost operation and cooling oil return)
HP
LP

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

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ON DIP
1 2 3 4
2.2.2 Basic control
2.2.2.1 Normal control
Input
Signal Actuator Cooling control (including cooling oil return)
Heating control (including
heating oil return)
Y Compressor (INV) Apply Compressor PI control to
maintain Tes*1
Apply Compressor PI control to
maintain Tcs*1
Y / O*2 Outdoor fan (FAN) Cooling fan control Heating fan control
O
*2 Reversing valve (ST1) De-energized
Energized (208/230Vac)
Y / O*2
Electronic expansion
valve (EEV)
480pls
PI control to maintain discharge
superheat (DSH)
Remarks:
1. Tes: Target Te value (Varies depending on the load of space, mode choice, silent setting, etc.)
Te: Low pressure equivalent saturation temperature (°F)
Tcs: Target Tc value (Varies depending on the load of space, mode choice, silent setting, etc.)
Tc: High pressure equivalent saturation temperature (°F)
2. SW1_3=OFF (factory), condensing unit uses Y/C/O (O for cooling) signal to operate heat pump.
SW1_3=ON has been set, condensing unit uses Y/C signal to run coolingonly.
SW1 on ODU PCB
SW1_3: AC / HP
Switch
2.2.2.2 Defrost control
This system carries out demand defrost control if any one of the following conditions satisfy.
I. The calculated temperature difference between ambient temperature (TA) and defrost
temperature (TH) is called Delta T. After Delta T is achieved and continues for 5 minutes.
a) 41°F < TA < 59°F, TH ≤ 30°F, Delta T = 18°F
b) 19°F ≤ TA ≤ 41°F, TH ≤ 30°F, Delta T = 12~18°F
c) TA <19°F, TH < 9°F, accumulative compressor run time ≥ 80 minutes
TH backup running, TA < 59°F and LP ≤ 90psi, accumulative compressor run time ≥ 60 minutes
II. After “Minimum Run Time” (MRT) is achieved.
a) MRT is 3.5 hours when TA <23°F
b) MRT is 2 hours when 23°F ≤ TA < 43°F
III. The high pressure drops below 245psi for 20 minutes when 14°F ≤ TA ≤28°F.
IV. Manual defrosting can be chosen from n08 setting.
Start-up control is enforced to complete, then wait another 5 minutes to activate the defrost operation.
Defrost will be terminated once defrost temperature sensor (TH) reaches 64°F for 60 seconds or the
defrost time has exceeded 8 minutes. Defrost mode setting (n04) offers termination options for
different geographical conditions.
a) Defrost in heavy snow area will extend defrost for 60 seconds, but reduce the heating time to execute
more defrost operations.
b) Defrost in light snow area will reduce defrost for 30seconds.

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2.2.2.3 AUTO charge mode and pump down function
Actuator AUTO charge mode OR
Pump down in cooling Pump down in heating
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
Outdoor fan (FAN)
Cooling fan control
Heating fan control
Reversing valve (ST1)
De-energized
Energized (208/230Vac)
Electronic expansion valve (EEV)
480pls
PI control to maintain DSH
AUTO charge mode locks the compressor speed in cooling. The LED will display the refrigerant
coefficient if both the liquid line sub-cooling (SC) and compressor suction superheat (SH) 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.
Target SC and SH
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 terrible due to improper superheat (i.e. SH >20 ゜F). Adjust
the system according to
1. Activate AUTO charge mode to fix compressor frequency(RPS) by press BS4 for 5 seconds on
outdoor PCB. Run the system for 15~20 minutes and check refrigerant coefficient number from
LED display or ESS Pro App, add refrigerant until you get 0.6.
2. Open the front panel of the indoor unit, use a wrench to counterclockwise the TXV until SH
≤ 20゜F. This will make more refrigerant flow into indoor coil for better cooling performance.
Pump down locks the compressor speed depending on the actual
mode. On the thermostat, set cooling for refrigerant recovery to
condenser or heating for refrigerant migration to indoor coil and line
sets. Hold and press BS4 button for 5 seconds until you see blinking
‘7’, press BS2 button in one minute to get ‘8’.
Once pump down is activated. The low pressure will be displayed on
LED. *NOTE Low pressure protection is valid if LP <24.5psig.
SEG1 SEG2 SEG3
BS1
BS3
SEG1 SEG2 SEG3
6~18゜F
SC
7~20゜F
SH
BS2

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BS4

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2.2.2.4 Compressor control
Standby
MAX 6 minutes for pressure
equalization
PI control
Depending on the load of the space.
Start-up control Directive control
• Pressure differential control
• MAX time (cooling) ≤ 10 minutes
• MAX time (heating) ≤ 45 minutes
Fixed speed
[Compressor RPS VS 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
Outdoor Capacity
2Ton
3Ton
4Ton
5Ton
Cooling Max RPS 70 80 66 76
Heating Max RPS
80 90 80 90
2.2.2.5 Fan control
Standby after
getting start signal
Pressure control
MAX STEP • Cooling fan control by high pressure
• Heating fan control by low pressure
Start-up control Directive control
[Fan RPM VS STEP]
Fixed speed

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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

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2.2.2.6 Electronic expansion valve (EEV) control
Standby after
getting start signal
• Cooling: 360pls→480pls
PI control
• Heating: 360pls→0pls • Cooling: 480pls
• Heating: Depending on the compressor
discharge superheat (DSH). *NOTE
Start-up control Directive control
• Cooling: 480pls
• Heating: Temperature differential control
Fixed opening
2.2.2.7 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.
Maximum compressor frequency
Cooling Max Compressor RPS
Condenser Capacity
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
Heating Max Compressor RPS
Condenser Capacity
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
Maximum fan speed
Max Fan Speed (RPM)
Condenser Capacity
Standard Mode
Silent Mode (Level 1)
Super Silent Mode (Level 2)
2Ton
830
680
550
3Ton 930 Cooling: 830 Heating: 780 680
4Ton
880
830
780
NOTE: Heating DSH should be between 25
゜
F and 50
゜
F with proper refrigerant level.
• Overcharged: DSH is smaller than 18 ゜F when the EEV opening < 72pls.
• Undercharged: DSH is bigger than 50 ゜F when the EEV opening ≥ 460pls
25~50゜F
DSH

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5Ton
980
880
780

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HP≥C HP<D HP<D
HP≥B
Upper limit compressor
After 15 sec. HP≥B
HP≥A
High pressure abnormal standby
Upper limit compressor step = Current step
Normal operation
(Upper limit compressor step = Max. step)
2.2.3. Protection controls
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.
step: Decrease 2step
Current step maintained
and
HP<D
Restart permission=ON
Symbol
EODA18H-2436/4860
Cooling Heating
A 545psig [3.8MPa] 545psig [3.8MPa]
B 493psig [3.4MPa] 479psig [3.3MPa]
C 479psig [3.3MPa] 450psig [3.1MPa]
D 464psig [3.2MPa] 421psig [2.9MPa]
Compressor restarts

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LP<C LP≥D LP≥D
LP<B
Upper limit compressor
After 15 sec. LP<B
LP<A
Low pressure abnormal standby
Upper limit compressor step = Current step
Normal operation
(Upper limit compressor step = Max. step)
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.
step: Decrease 2steps
Current step maintained
and
LP≥D
Restart permission=ON
Symbol EODA18H-2436/4860
A 24.5psig [0.17MPa]
B 43.5psig [0.30MPa]
C 61.0psig [0.42MPa]
D 72.5psig [0.50MPa]
Compressor restarts

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TD≥C TD<D TD<D
TD≥B
Upper limit compressor
After 15 sec. TD≥B
TD≥A
Upper limit compressor step = Current step
Normal operation
(Upper limit compressor step = Max. step)
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.
step: Decrease 2steps
Current step maintained
and
TD<D
Restart permission=ON
Symbol
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)
Discharge temperature abnormal standby
Compressor restarts

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TF≥C TF<D TF<D
TF≥B
Upper limit compressor
After 15 sec. TF≥B
TF≥A
Inverter heat sink temperature abnormal standby
Upper limit compressor step = Current step
Normal operation
(Upper limit compressor step = Max. step)
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.
step: Decrease 1step
Current step maintained
and
TF<D
Restart permission=ON
Symbol
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)
Compressor restarts

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IA≥C IA<D IA<D
IA≥B
Upper limit compressor
After 30 sec. IA≥B
IA≥A
Upper limit compressor step = Current step
Normal operation
(Upper limit compressor step = Max. step)
2.2.3.5 Compressor over-current protection control
This control is performed to prevent tripping due to an abnormal transient compressor current (IA).
step: Decrease 1step
Current step maintained
and
IA<D
Restart permission=ON
Symbol
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
Inverter current abnormal standby
Compressor restarts

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2.3 Field Setting
2.3.1 Default display
LED on main control board can display the operating status of outdoor unit (ODU).
SEG1 SEG2 SEG3 7 segment display instructions
SEG1: Normally blank, but it displays codes “1~9” accordingly if there is damaged sensor and demand
control requirement.
SEG1 Code
Description
Time
0 Software is updating through IoT device About 5 min
1 High pressure sensor (HP) fault backup running 7 Days
2 Low pressure sensor (LP) fault backup running 7 Days
3 Compressor discharge temperature sensor (TD) fault backup running 7 Days
4
IPM module temperature sensor (TF) fault backup running
7 Days
5 Ambient temperature sensor (TA) fault backup running 120 Days
6 Defrost sensor (TH) fault backup running 90 Days
7
Compressor suction temperature sensor (TS) fault backup running
120 Days
8 Liquid line temperature sensor (TL) fault backup running 120 Days
9
IoT demand response
-
SEG2: Normally blank, but it will display code accordingly as below if outdoor unit is running under
limited condition.
SEG2 Code
Description
0
Running under high pressure (HP) limit
1
Running under low pressure (LP) limit
2 Running under discharge temperature (TD) limit
3
Running under IPM module temperature (TF) limit
4
Running under compressor current limit
SEG3: It displays outdoor unit’s operation mode.
SEG3 Code
Description
0 Stop without running signal (Y signal=OFF)
1 Ready to start-up after receiving running signal (Y signal=ON)
*Note
2
Cooling mode
3
Heating mode
4 Oil return
5
Defrost
6
Manually defrost
7
AUTO charge mode in cooling
8 Pump down
Note: Compressor waits 3~6 minutes to restart.