Table 12 Minimum efficiency by system type

Required for each system type: dedicated outdoor air system

 Air-cooled direct expansion efficiency

> 5.2 ISMRE @ AHRI 920 (2020) conditions

 Multistage or variable-speed drive compressor

Multistage or variable-speed drive compressor Minimum turndown ≤ 20% of compressor capacity

 Supply fan

Minimum turndown 30% of design flow

 Exhaust energy recovery

B (dry) zones: 72% dry-bulb temperature reduction

 Direct expansion heat pump

> 3.8 ISCOP @ AHRI 920 (2020) conditions

System a-air-source heat pump (ASHP) multisplit

 Air-source variable refrigerant flow multisplit (cooling mode)

< 19 kW/h; 20 SEER

> 19 kW/h and < 39.5 kW/h; 13.1 EER; 15 IEER^a

> 39.5 kW/h and < 70.3 kW/h; 11.0 SEER; 14.0 IEER^a

 Air-source variable refrigerant flow multisplit (heating mode)

< 19 kW/h; 14 HSPF^a

> 19 kW/h and < 39.5 kW/h; 3.7 COP^a

 Terminal fan

electronically commutated motor fans and < 0.38 W/cfm at design

 Temperature set point

Heating 21, cooling 23 ◦C

Maximum air leakage rate

0.1 L/S

Activity (Metabolism rate)

1.2 (residential)

Clothing

Summer 0.5, Winter 1

Occupancy heat gains

40–70 w/m² (sleeping-seated)