Air Conditioning Inspection

Item

Meaning

Remarks

Standard conditions

Cooling: Indoor dry 27°C/wet 19°C, Outdoor dry 35°C/wet 24°C

Heating: Indoor 20°C, Outdoor 7°C

Standard air

Dry air at 20°C, 1 standard atmosphere, density 1.20 kg/m³

Circulating air volume

Air volume passing through the indoor unit evaporator per unit time (m³/h)

Enthalpy difference method

Wind speed × air outlet area

Ventilation air volume

Fresh air volume entering indoors from outdoors per unit time (m³/h)

Ventilation capacity

Wind speed × air outlet area

Enthalpy difference method

Measure supply/return air parameters, circulating air volume

Product of air volume and supply/return air enthalpy difference, i.e., heating/cooling power

Measures all performance parameters of air conditioner except noise

Heating power consumption

Input power (W) during heating operation under rated conditions

Input power

Heating capacity

Heating output per unit time during heating operation under rated conditions (W)

Heating power

COP

COP = Heating power / Heating input power, i.e., heating efficiency

Coefficient of Performance

Cooling power consumption

Input power (W) during cooling operation under rated conditions

Input power

Cooling capacity

Cooling output per unit time during cooling operation under rated conditions (W)

Cooling power

EER

EER = Cooling power / Cooling input power, i.e., cooling efficiency

Energy Efficiency Ratio

Dehumidification capacity

Ability to remove moisture from indoors per unit time

Item

Standard Requirement

Method

Heating power

>95% of rated value

Enthalpy difference test

Heating input power

<110% of rated value

COP

>90% of rated value, and the rated value must meet energy consumption requirements

Cooling power

>95% of rated value

Cooling input power

<110% of rated value

EER

>90% of rated value, and the rated value must meet energy consumption requirements

Electric heating input power

Less than 200W: ±10%

Greater than 200W: -10%/+5% or 20W (whichever is larger)

Dehumidification test

/

Standard conditions

Dehumidification operation for one hour

Freezing check

Conditions: Air conditioner set to the state most prone to frosting, indoor dry 25°C/wet 11°C

1. Indoor unit evaporator, frosting area <50%

Run for 4 hours, check frosting area

2. No dripping from indoor unit, air supply should not blow out water

Cover the return air outlet, run for 6 hours,

Stop completely for defrosting, then maximum wind speed for 5 minutes

Condensation check

Drainage check

Conditions: Air conditioner set to the state most prone to condensation, both sides dry 27°C/wet 24°C

1. Condensation on indoor unit surface should not drip

Air supply should not carry water droplets

Cooling operation for 4 hours

2. Can automatically discharge condensate water

Water should not blow out or overflow

Fill the water tray with water, run cooling operation

Defrost test

Conditions: Air conditioner set to the state most prone to frosting, indoor dry 20°C/wet 12°C, outdoor dry 1°C/wet 1°C

1. Defrost time <20% of operation time

2. Frost layer on outdoor unit should melt away

Item

Method National Standard GB7725

US Standard RAC-1

(Standard requirement: Can operate normally, components not damaged, overload protection does not trip)

Maximum cooling operation

Conditions: Air conditioner set to maximum cooling state, air damper closed, 90% and 110% voltage

T1 Indoor dry 32°C/wet 23°C Outdoor dry 43°C/wet 26°C

T2 Indoor dry 27°C/wet 19°C Outdoor dry 35°C/wet 24°C

T3 Indoor dry 32°C/wet 23°C Outdoor dry 52°C/wet 31°C

Indoor dry 32°C/wet 23°C Outdoor dry 43°C/wet 26°C

Run 3 hours, stop 3 minutes, run 3 hours again

Run 2H, stop 3 min, run 1H

Minimum cooling operation

Conditions: Air conditioner set to the state most prone to frosting, both sides dry 21°C/wet 15°C

Air damper closed, minimum cooling operation for 4 hours

Not required

Maximum heating operation

Conditions: Air conditioner set to maximum cooling state, air damper closed, 90% and 110% voltage

Indoor 27°C, Outdoor dry 24°C/wet 18°C

Run 3 hours, stop 3 minutes, run 3 hours again

Run 2H, stop 3 min, run 1H

Minimum heating operation

Conditions: Indoor dry 20°C/wet (none), Outdoor dry -5°C/wet -6°C

Air damper closed, minimum heating operation for 4 hours

Not required

Item

Standard Requirement

Method

Enthalpy difference test

Test:

Inlet air parameters (temperature/humidity)

Return air parameters (temperature/humidity)

Circulating wind speed/air outlet area

Calculate:

Cooling power (cooling capacity)

Heating power (heating capacity)

Calculate:

Heating efficiency COP = Heating capacity / Input power

Cooling efficiency EER = Cooling capacity / Input power

Test method

See 3. Test Method for details

Energy efficiency grade

See table below

Noise test

Rated value < standard limit

Measured value < rated value + 3 dB

Leak test

<2 g/year

(Factory requirement for R410, etc. <0.5 g/year)

Coating cross-cut test

1. Cut 4 lines through the coating to the base metal, forming 9 small 1mm x 1mm squares

2. Brush with a 25-35mm wide paint brush to check if the coating peels off from the squares

3. Maximum allowable total area of peeling squares is 3