UpCodes logo
Go To Full Code Chapter
This test ensures that adequate outdoor air ventilation is provided through the variable air volume air handling unit at two representative operating conditions. The test consists of measuring outdoor air values at maximum flow and at or near minimum flow. The test verifies that the minimum volume of outdoor air is introduced to the air handling unit where the system is in occupied mode at these two conditions of supply airflow. This test shall be performed in conjunction with supply fan variable flow controls test procedures to reduce the overall system testing time as both tests use the same two conditions of airflow for their measurements.
E 805.1.1 Test Procedure
The procedure for performing a functional test for variable air volume systems shall be in accordance with Section E 805.1.1.1 and Section E 805.1.1.2.
E 805.1.1.1 Construction Inspection
Prior to functional testing, verify and document that the system controlling outside airflow is calibrated either in the field or factory.
E 805.1.1.2 Functional Testing
The functional testing shall be in accordance with the following steps:
Step 1: Where the system has an outdoor air economizer, force the economizer high limit to disable economizer control (e.g., for a fixed drybulb high limit, lower the setpoint below the current outdoor air temperature).
Step 2: Adjust supply airflow to either the sum of the minimum zone airflows or 30 percent of the total design airflow. Verify and document the following:
  1. Measured outside airflow reading is within 10 percent of the total ventilation air called for in the certificate of compliance.
  2. OSA controls stabilize within 5 minutes.
Step 3: Adjust supply airflow to achieve design airflow. Verify and document the following:
  1. Measured outside airflow reading is within 10 percent of the total ventilation air called for in the certificate of compliance.
  2. OSA controls stabilize within 5 minutes.
Step 4: Restore system to "as-found" operating conditions.
E 805.1.2 Acceptance Criteria
System controlling outdoor air flow shall be calibrated in the field or at the factory.
Measured outdoor airflow reading shall be within 10 percent of the total value found on the certificate of compliance under the following conditions:
  1. Minimum system airflow.
  2. Thirty percent of total design flow design supply airflow.

Related Code Sections

E 805.1 Sustainable Practices, Variable Air Volume Systems (Form Mech- 2A)
The procedure for performing a functional test for variable air volume systems shall be in accordance with Section E 805.1.1.1 and Section E ...
E 804.2 Sustainable Practices, Tests
with Section E 805.0 using the following forms: Minimum ventilation controls for constant and variable air volume systems (Form MECH-2A). Zone ...
E 805.2 Sustainable Practices, Constant Volume Systems (Form MECH-2A)
for performing a functional test for constant air volume systems shall be in accordance with Section E 805.2.1.1 and Section E 805.2.1.2 ...
E 805.2.1 Sustainable Practices, Test Procedure
The procedure for performing a functional test for constant air volume systems shall be in accordance with Section E 805.2.1.1 and Section E ...
E 805.2.2 Sustainable Practices, Acceptance Criteria
The system has a means of maintaining the minimum outdoor air damper position. The minimum damper position is marked on the outdoor air damper. The ...