5.3104.5 Optimize Outdoor Reset Valve Controller (Hot Water)

Topic: 
Hydronic Heating (Hot Water and Steam)
Subtopic: 
Equipment Maintenance, Testing, and Repair
Desired Outcome: 
Varied distribution loop temperatures match seasonal heating load
TitleSpecification(s)Objective(s)
5.3104.5a
Verify proper placement and condition of indoor and outdoor sensors

Sensor location and condition will be assessed in accordance with SWS 5.3102.6 Installation of Outdoor Reset Valve and Controller (Hot Water)

Determine optimal location for sensor installation

5.3104.5b
Repair and reinstall, as necessary

Repair and reinstall will be in accordance with SWS 5.3102.6 Installation of Outdoor Reset Valve and Controller (Hot Water)

Ensure proper functionality of the control

5.3104.5c
Set initial high and low operating temperatures

High and low temperatures will be set in accordance with system design, operator feedback, and/or historical data

Minimum distribution loop water temperature requirement will be maintained

Maintain minimum building heat requirements

5.3104.5d
Modify operating set points based on observed system performance

Accurate supply and return temperatures will be obtained and compared to design distribution loop temperature differential on representative mild, cold, and design temperature days

Settings will be adjusted to maintain design distribution loop differential temperature on representative mild, cold, and design temperature days

Minimum distribution loop water temperature requirement will be maintained

Ensure optimal settings based on actual operating conditions to limit system overheating and improving boiler energy use

5.3104.5e
Record and report settings

Observed supply, return, outdoor temperatures, and all control set points on representative mild, cold, and design temperature days will be documented and provided to building operations staff

Ensure written record of settings

5.3104.5f
Educate building operations staff

Building operations staff will be educated to operate outdoor reset control, including sensor location, control operation, and set points

Ensure continued optimized performance