Specifications

2008 Residential Appendices RA3-21

Appendix RA3 – Residential Field Verification and Diagnostic Test Protocols

This location can be in any one of the four sides of the coil box/supply plenum.

This location shall have a 1/4" (6 mm) diameter hole (HSPP) or a permanently affixed static pressure

probe (PSPP). The location shall be labeled "Title 24 – Supply Pressure Measurement Location" in at

least 12-point type.

RA3.3.1.2 Fan Flow Measurements

All measu

rements of distribution fan flows shall be made with measurement systems (i.e., sensor plus

data acquisition system) having an accuracy of ± 7% reading or ± 5 cfm whichever is greater.

RA3.3.1.3 Watt Measurements

All measu

rements of air handler watt draws shall be made with true power measurement systems (i.e.,

sensor plus data acquisition system) having an accuracy of ± 2% reading or ± 10 watts whichever is

greater.

RA3.3.2 Apparatus

RA3.3.2.1 System Fan Flows

HVAC sy

stem fan flow shall be measured using one of the following methods.

RA3.3.2.1.1 Plenum Pr

essure Matching Measurement

Air Flow

Evaporator Coil

.75B

.75A

1/4 inch diameter hole

or permanent static

pressure probe