Specifications

2008 Residential Appendices RA3-11
Appendix RA3 – Residential Field Verification and Diagnostic Test Protocols
Air Flow
Evaporator Coil
A
B
.75B
5/16 inch diameter
hole
Supply
Plenum
/Coil Box
A = Supply
Plenum/ Coil
Box Dimension
parallel to
Airflow
B = Supply
Plenum/ Coil
Box Dimension
perpendicular to
Airflow
.75A
5/16 inch diameter
hole
Return
Plenum/
Blower
Compartment
C
D
.75C
.75D
C
= Return
Plenum/ Blower
Compartment
Dimension
parallel to
Exiting Airflow
D = Return
Plenum/ Blower
Compartment
Dimension
perpendicular to
Exiting Airflow
Title 24 Supply
Plenum
Temperature
Access
Title 24 Return
Plenum
Temperature
Access
Each location shall have a 5/16" (8 mm) diameter hole. The supply location shall be labeled "Title 24 – Supply
Temperature Access" in at least 12-point type. The return location shall be labeled "Title 24 – Return
Temperature Access" in at least 12-point type. These locations can be in any one of the four sides of the
plenums.
RA3.2.2.3 Refrigerant Gauges and Saturation Temperature Measurement Sensors (STMS)
A refrige
rant gauge with an accuracy of plus or minus 3 percent shall be used. As an alternative, two saturation
temperature measurement sensors (sensors) shall be placed in a manner and location determined by the
equipment manufacturer as measuring the saturation temperature of the refrigerant in the evaporator coil and
in the condenser coil within 1.3 ºF. These sensors shall be permanently mounted and have standard
temperature sensor mini plugs accessible to the installing technician and the HERS rater without changing the
airflow through the condenser coil. Other saturation temperature measurement sensor instrumentation
methodologies shall be allowed if the specifications for the methodologies are approved by the Executive
Director.
RA3.2.2.4 Calibration
The accu
racy of instrumentation shall be maintained using the following procedures. A sticker with the
calibration check date shall be affixed to each instrument calibrated.
RA3.2.2.4.1 Thermomete
r/ and Temperature Sensor Field Calibration Procedure
Thermometers/temperature sensors shall be calibrated monthly to ensure that they are reading accurate
temperatures.
The following procedure shall be used to check thermometer/temperature sensor calibration: