Troubleshooting - Johnson Controls - LIT-12014272 - Valve

Troubleshooting - Johnson Controls - LIT-12014272 - Valve - Venturi Valve

Venturi Air Valve with UVM1000 Installation Guide

Product

Valves and Actuators > Valves > Venturi Valve

Document type

Installation Guide

Document number

LIT-12014272

Revision date

2023-03-10

Use the following information as a guide for potential resolution of a site issue.

Table 1. Troubleshooting
Problem	Causes	Solution
Fume hood monitor in alarm; Room pressurization problem. Low static pressure across valve (<0.6 in. W.C; 150 Pa)	Too many sashes open at one time Sash open beyond maximum allowable position Blocked or kinked pressure switch tubing	Contact HVAC service maintenance contractor to inspect, verify and correct. Review operator sash movement.
	Incorrect valve position Valve is not responding to input signal Loss of pneumatics Mechanical linkage is disconnected Loss of power or electrical control signal Broken sash cable Monitor calibrated incorrectly Incorrect wiring terminations	Contact HVAC service maintenance contractor to inspect, verify and correct.
Temperature control issues	Reheat system issues Thermostat malfunction Air handler malfunction Water valve response issues	Contact HVAC service maintenance contractor to inspect, verify and correct.
Valve banging	Fluctuation in pressure that is out of acceptable design range Lack of bypass damper control Slow response to duct pressure control	Adjust bypass damper control. Install fast acting actuators; flow probes and VAV control; integrate into stand alone lab control. Contact HVAC service maintenance contractor for inspection, verification and correction. Note: Exposing any Venturi Valve to excessive pressures that are outside of the range of specification may require the valve to be recalibrated and recertified at factory; potential damage to the valve may also occur.
Monitor indicates normal operation, but actual face velocity or flow is measured high or low.	Low or high static pressure	Verify at least 0.6 in. W.C (150 Pa) across valve. Connect a Magnahelic gauge across the valve taps. For hood valves, check voltage at TB-16 at fume hood monitor. (>10 V=low static)