Ecoer 2436 User manual

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05.2018Manufacturer reserves the right to change at any time for specifications or designs without notice and incurring obligations.
ESI Outdoor Unit Function and control
Function and Control for Ecoer Smart Inverter
(ESI) Unitary System with IoT Technology

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ESI Outdoor Unit Function and control
1.1 Refrigerant Circuit
1. Major components function and refrigerant flow
HP
TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Stop Valve
Heat Exchanger
Gas Stop Valve
Gauge Port
FAN
LP
Name
Symbol
Function
Inverter compressor INV Adjusts refrigerant flow rate by changing the frequency based on
objective pressure.
Inverter fan FAN Outputs heat exchanger capacity by adjusting rotation speed based on
operating pressure.
Electronic expansion
valve EEV 1) Fully open during cooling mode and defrost operation. 2) Control 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 suction temperature and calculate suction superheat
(SH).
TL Uses to detect liquid pipe temperature and calculate sub-cooling (SC).
TD Uses to detect 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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ESI Outdoor Unit Function and control
1.2 Cooling Operation (including cooling oil return and defrost operation)
1.3 Heating Operation (including heating oil return)
HP
TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Stop Valve
Heat Exchanger
Gas Stop Valve
Gauge Port
TXV
Heat Exchanger
High pressure Gas
High pressure Liquid
Low pressure Gas
Low pressure Mix.
FAN
LP
PP TD
EEV
INV
TH
TA
ST1
TS
TL
ACC
Liquid Stop Valve
Heat Exchanger
Gas Stop Valve
Gauge Port
TXV
Heat Exchanger
High pressure Gas
High pressure Liquid
Low pressure Gas
Low pressure Mix.
FAN
LP

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ESI Outdoor Unit Function and control
2. Control logic description
2.1 Operation Mode
Operation in stop
mode
Pressure
equalizing prior to
start up
Thermostat ON
(Y=ON)
Thermostat OFF
Startup control*1
・Cooling startup
(O=ON)
・Heating startup
(O=OFF)
Outdoor unit
rotation
Cooling or heating
operation
Oil return
IN conditions
are met.
Defrost
IN conditions
are met.
NO
NO
Oil return operation*1
YES
Defrost operation*1
YES
Outdoor unit
rotation
Normal operation
・Compressor PI control
・EEV PI control
・Fan motor control
・Protection control
Restart standby
(compressor stops)
Malfunction
/Thermostat OFF
/O be changed
Malfunction
/Thermostat OFF
/O be changed
Y=OFF
O be changed
or
Longest 6 minutes
after 1 minute
*1 If Y or O signal is changed during the process, the system may be forced to complete it
under some conditions.

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ESI Outdoor Unit Function and control
Mode list
SEG1 SEG2 SEG3
Stand by without running signal
→State Code (SEG3): 0
SEG1 SEG2 SEG3
Wait to start after receiving running signal
(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
Forced defrost
→State Code (SEG3): 6

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ESI Outdoor Unit Function and control
2.2 Basic control
Actuator Operation Remark
Compressor
Apply Compressor PI control
to maintain Tes
according to
load of the room.
High pressure protection control,
Low pressure protection control,
Discharge temperature protection control,
Compressor operating frequency upper limit control
with inverter protection control.
Outdoor fan Cooling fan control -
Four way valve OFF -
Electronic
expansion valve 480pls -
2.2.1 Cooling control (including cooling oil return)
Actuator Operation Remark
Compressor
Apply Compressor PI control
to maintain Tcs according to
load of the room.
High pressure protection control,
Low pressure protection control,
Discharge temperature protection control,
Compressor
operating frequency upper limit control
with inverter protection control.
Outdoor fan Heating fan control -
Four way valve ON -
Electronic
expansion valve PI control to maintain
discharge superheat -
2.2.2 Heating control (including heating oil return)
*Te: Low pressure equivalent saturation temperature(F)
Tes: Target Te value (Varies depending on mode choice, silent setting, etc.)
*Tc: High pressure equivalent saturation temperature(F)
Tcs: Target Tc value (Varies depending on mode choice, silent setting, etc.)
SEG1 SEG2 SEG3
Test mode7 (high frequency)
→State Code (SEG3): 7
SEG1 SEG2 SEG3
Test mode8 (low frequency)
→State Code (SEG3): 8

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ESI Outdoor Unit Function and control
2.2.4 Test mode control
(Valid to AUTO refrigerate charge or pump down)
2.2.3 Defrost operation
During low ambient temperature heating operation, the outdoor heat exchanger may be
covered by frost, which will reduce heating capacity as well. The system carrier out
defrost operation automatically in the case any of the condition is satisfied.
•The heat exchanger temperature TH becomes lower than deicer temperature.
•The system high pressure change rate related to ambient temperature or running
time.
Ecoer offers three defrost setting options(n04) designed for different humidity area.
Defrost can be set manually(n08) after start up control. For more details, refer to field
setting section.
It will be terminated once the condenser coil temperature(TH) reaches target
temperature or the defrost time has exceeded 8 minutes.
Actuator Operation Remark
Cooling(Test mode 7)
Heating(Test mode 8)
Compressor
2ton: 26~56rps
3ton: 36~66rps
4ton: 26~56rps
5ton: 36~66rps
2ton: 26~66rps
3ton: 36~80rps
4ton: 26~58rps
5ton: 36~70rps
Protection control is valid during
this process.
*Low pressure protection if Pe
is less than 24.5psig.
Outdoor fan Cooling fan control Heating fan control -
Four way valve OFF ON -
Electronic
expansion valve 480pls PI control to maintain
discharge superheat -

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ESI Outdoor Unit Function and control
2.3 Compressor control
Start up control
PI control
Directive control
•Differential control
•MAX time (cooling) ≤ 10 minutes
•MAX time (heating) ≤ 45 minutes
Fixed speed in most cases
Depending on the load of the room.
Standby
MAX 6 minutes for pressure
equalization
[2ton/3ton/4ton/5ton-STEP/frequency]
STEP
RPS
STEP
RPS
STEP
RPS
STEP
RPS
STEP
RPS
1 12 10 30 19 48 28 66 37 84
2 14 11 32 20 50 29 68 38 86
3 16 12 34 21 52 30 70 39 88
4 18 13 36 22 54 31 72 40 90
5 20 14 38 23 56 32 74
6 22 15 40 24 58 33 76
7 24 16 42 25 60 34 78
8 26 17 44 26 62 35 80
9 28 18 46 27 64 36 82
Outdoor Capacity
2 Ton 3 Ton 4 Ton 5 Ton
Cooling Max RPS
70 80 66 76
Heating Max RPS
80 90 80 90

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ESI Outdoor Unit Function and control
2.4 Fan control
Start up control
Pressure control
Directive control
•Cooling fan control by high pressure
•Heating fan control by low pressure Fixed speed in most cases
Standby after getting
start signal
MAX STEP •Cooling fan control by high pressure
•Heating fan control by low pressure
2.5 Electronic expansion valve(EEV) control
Startup control
PI control
Directive control
•Cooling: 480pls
•Heating: Differential control Fixed speed in most cases
Standby after getting
start signal
•Cooling: 360pls→480pls
•Heating: 360pls→0pls •Cooling: 480pls
•Heating: Depending on the discharge
superheat.
[2ton/3ton/4ton/5ton-STEP/RPM]
STEP RPM STEP RPM
0 0 6 830
1 350 7 880
2 450 8 930
3 550 9 980
4 680 10 1050
5 780 11 1100

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ESI Outdoor Unit Function and control
3. Protection functions
Pc≥C
Normal operation
(Upper limit compressor step=Max.step)
Pc<D
Upper limit compressor
step: Decrease 2step
Current step maintained
After 15 sec.
Pc≥A
High pressure abnormal standby
Pc≥B
Upper limit compressor step=Current step
Pc≥B
Compressor restart
Pc<D
Value setting 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]
3.1 High pressure protection control
High pressure protection control is used to prevent extremely high pressures in the
system and protect the compressor.
Restart permission=ON
and

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

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ESI Outdoor Unit Function and control
3.3 Discharge temperature protection control
This discharge temperature 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 restart
TD<D
Value setting 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

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ESI Outdoor Unit Function and control
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 1steps
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 restart
TF<D
Value setting 2436 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

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ESI Outdoor Unit Function and control
3.5 Over-current protection control
This control is performed to prevent tripping due to an abnormal transient current.
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 restart
IA<D
Value setting 2436 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