5.3104.6 Repair/Replace Existing Thermostatically Controlled Zone Valves (Hot Water)

Topic: 
Hydronic Heating (Hot Water and Steam)
Subtopic: 
Equipment Maintenance, Testing, and Repair
Desired Outcome: 
Restored functionality of individual zone control valves
TitleSpecification(s)Objective(s)
5.3104.6a
Check for presence of asbestos-containing materials (ACMs)

Potential ACMs will be handled in accordance with SWS 2.0110.2 Potential Asbestos-Containing Materials

Ensure a safe work environment
5.3104.6b
Replace failed actuator

Actuator will be removed from valve stem and energized to check for functionality

Failed actuators will be replaced in accordance with manufacturer specifications

If actuator will not operate valve, valve will be replaced

Confirm actuator operation
5.3104.6c
Isolate zone valve location

Nearest valves on either side of valve location will be closed

Eliminate the water supply to the valve location
5.3104.6d
Install zone valve

Zone valve will be replaced in accordance with valve manufacturer specifications

System will be refilled and air will be eliminated

Allow distribution loop to flow to the bypass zone and eliminate overheated and underheated zones
5.3104.6e
Reinsulate area

Where insulation was removed, valve will be reinsulated with new insulation to IECC IECC International Energy Conservation Code and ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 90.1, at a minimum

Reduce energy loss

Maintain safe surface temperature