This kit contains all the top shelf tools we would recommend for quality and value to help you meet or exceed the expected measurement quality outcome for quality installations. These kits focus on the tools required for equipment installation and duct leakage/distribution. There are several selections to choose from to custom design a complete instrumentation package that will fall within your needs and price range.
The following excerpts from the Standard will help you focus on appropriate set of products. Please reference the current Standard here
4.1 Airflow across Indoor Heat Exchangers
4.1.2 Acceptable Procedures
The contractor shall test using one or all of the following acceptable devices for fulfilling the desired criteria:
a) Pressure matching method
b) An anemometer (e.g., hot wired, rotary style) or other methods (e.g., transverse pitot tubes) for measuring total static and velocity pressures to determine airflow velocity in several traversing locations per AABC, NEBB, or ASHRAE procedures
c) Flow grid measurement method
d) A manometer to determine the pressure drop across a clean cooling coil or fan coil unit and compare with values from the OEM CFM/pressure drop coil tables
e) The temperature rise method (for heating equipment only gas or oil furnace, electric heat) to verify proper airflow across the heat exchanger or heater elements.
[Note: It is not acceptable to use the temperature rise method for cooling (i.e., airflow over the indoor coil).]
4.2 Refrigerant Charge
4.2.2 Acceptable Procedures
The system shall be charged according to an approved/acceptable charging method.
The charging method used should be documented, including:
- system conditions
- calculations conducted
If ambient conditions require a follow-up visit to finalize the charging process, this should be recorded both at the initial visit and the follow-up visit.
The contractor shall use one or all of the following acceptable procedures for completing the desired measurements after confirmation of required airflow over the indoor coil per 4.1:
a) Superheat test done under outdoor ambient conditions, as specified by the OEM instructions (typically, 55F drybulb temperature or higher)
b) Subcooling test done under outdoor ambient conditions, as specified by the OEM instructions (typically, 60F or higher)
4.3.2 Acceptable Procedures
The contractor shall test using the following acceptable procedures for fulfilling the design criteria:
a) Volt meter to measure the voltage
b) Amp meter to measure the amperage
c) Verify measurements with nameplate and over current protection criteria
4.4 On-Rate For Fuel Fired Equipment
4.4.2 Acceptable Procedures
a) Gas-Fired Equipment:
The contractor shall test using both of the following acceptable procedures for fulfilling the desired criteria:
i. Clocking the meter or other fuel input measurement per OEM instructions, and
ii. Measuring the temperature rise at steady state conditions (with airflow first verified by 4.1) furnaces only.
NOTE : Combustion analysis may be necessary in some cases.
b) Oil-Fired Equipment:
The contractor shall fulfill the following criteria:
i. Verify nozzle or alternate input nozzle per OEM installation or oil burner instructions.
ii. Adjust oil pump pressure with a dial or electronic gauge designed for oil pressure measurement
iii. Measure the temperature rise at steady-state conditions (with airflow first verified by 4.1) furnaces only.
iv. Perform a combustion analysis per OEM installation or oil burner instructions.
5.1 Duct Leakage
5.1.2 Acceptable Procedures
The contractor shall test using one or more of the following acceptable procedures for fulfilling the desired criteria:
a) Duct pressurization tests
b) For COMMERCIAL BUILDINGS: Total room supply CFMs and return CFMs compared with blower capability (e.g., flow hood method)
c) Blower door subtraction method
d) A hybrid duct pressurization test / blower door subtraction