CSA C823-11:2016 pdf download.Performance of air handlers in residential space conditioning systems
5.1.5 The return air intake shall be prepared for the test. If the air handler is designed for multiple inlet configurations to provide installers with a choice in selecting the return air intake locations, the bottom inlet configuration shall be used. For air handlers with fixed return air inlet locations, a return air cutout that complies with the manufacturer's dimensional specifications shall be made.
5.1.6 An inlet duct that has dimensions that matching those of the return air inlet connection and a length of 2.5 equivalent duct diameters shall be secured to the return air connection of the air handler. A static pressure tap shall be installed on the inlet duct at a distance of 0.5±0.25 equivalent diameters from the entry to the air handler. The static pressure tap shall be used to determine the inlet static pressure to the air handler that shall be used as the point of reference for determining differential static pressure across the air handler during testing.
Note: See Figure 1 for details on fabrication of the inlet static pressure tap and Clause 5.2 for the specifications of the outlet
pressure tap.
5.2 Outlet duct dimensions and static pressure tap
The air supply outlet from the air handler shall be connected to an airflow-measuring apparatus using a duct that is fabricated in accordance with the dimensions shown in Figure 1 and secured to the air handler outlet connection. The static pressure taps shown in Figure 1 shall be used to measure the outlet static pressure from the air handler.
5.3 Electrical supply
The electrical supply to all electric components of the air handler shall be maintained within +1% of the nameplate voltage during testing. If the nameplate specifies a voltage range, the electrical supply shall be maintained within +1% of the midpoint of the range. If the nameplate specifies a dual voltage, the electrical supply shall be maintained within +1 % of the higher voltage.
5.4 Electrical power and energy consumption measurement
Instruments shall be installed to measure the quantity of electrical energy supplied to the air handler.The electrical power and energy used by the circulation blower motor shall also be measured separately (i.e., submetered). Electrical power and energy consumption measurements shall be expressed in kW or kWh, as applicable. Electrical measurements shall be taken in accordance with CAN/CSA-C62301.
5.5 Test room temperature
A thermocouple or other temperature-sensing device shall be installed in the test room with its junction or sensing element shielded from direct radiation from the air handler. It shall be positioned at the vertical midpoint of the air handler at a perpendicular distance of 600 mm (24 in) from any one surface of the air handler.CSA C823-11 pdf download.