What are the standard test conditions for cooling an air-cooled unit?

Indoor: 27°C Dry Bulb / 19°C Wet Bulb. Outdoor: 35°C Dry Bulb / 24°C Wet Bulb, as per Table 1.

What is the minimum EER for a 25 kW (~7 TR) air-cooled packaged AC?

2.80 W/W, as per Table 2 for units in the range of > 17.58 kW to 35.17 kW.

Does this code specify noise limits?

Yes, Clause 5.5 and Table 3 specify the maximum sound power levels for outdoor units based on their cooling capacity.

Which safety standard is referenced for packaged ACs?

IS 1391 (Part 2) for general electrical safety and IS 660 for mechanical refrigeration safety are the primary references (Clause 7).

IS 8148

: 2018

Packaged Air Conditioners - Specification

CurrentFrequently UsedSpecificationBIMMEP · HVAC and Air Conditioning

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This standard specifies the constructional, performance, safety, and testing requirements for packaged air conditioners. It covers both air-cooled and water-cooled units up to a rated cooling capacity of 120 kW, defining standard rating conditions and minimum energy efficiency ratios (EER).

Specifies requirements for the design, construction, performance, and testing of packaged air conditioners.

Quick Reference Values

Standard indoor dry-bulb temp for cooling27 °C

Standard indoor wet-bulb temp for cooling19 °C

Standard outdoor dry-bulb temp for cooling (Air-Cooled)35 °C

Minimum EER for air-cooled packaged AC (<= 35.17 kW)2.80 W/W

Minimum EER for water-cooled packaged AC (> 35.17 kW)3.20 W/W

Maximum permissible voltage variation± 10% of rated voltage

Maximum permissible frequency variation± 3% of rated frequency

Key Formulas

Energy Efficiency Ratio (EER) = Net Cooling Capacity (W) / Total Power Input (W)

Practical Notes

This standard is for mono-block packaged units, not for split systems (covered by IS 1391) or chillers.

The specified EER values are minimums for compliance; higher efficiency units should be selected to meet energy codes like ECBC.

Ensure site installation conditions (ambient temperatures, voltage stability) are considered, as performance is rated under specific test conditions defined in Table 1.