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The Performance of indoor test units (room air conditioners)is measured directly.
The cooling and dehumidifying capacity of the air conditioner's indoor unit in cooling mode, and the heating capacity of the air conditioner's indoor unit in heating mode, are balanced with thermal capacity of the measuring device, and the thermal input is measured.
The thermal input for heating and cooling is measured in the same way for outdoor units.
The calculated value based on the outdoor unit's measurement must be with 4% of the indoor unit's measurement(JIS requirement).

Capacity can be measured more accurately when the heat leakage from the test chamber approaches zero.This measurement method is most suitable when accurate capacity measurement is of prime importance with standard test conditions(fixed).

JIS C 9612 room air conditioner

This type has a dual construction in which an additional temperature control chamber(extnal chamber) is provided outside the indoor and outdoor test chambers.Equilibrium between the temperatures at the indoor and outdoor unit test chambers and that of the external chambers is maintained to eliminate temperature difference, and allow accurate capacity measurement.

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