Ecoer 2436, 4860 User Manual

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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