5.3102.6 Installation of Outdoor Reset Valve and Controller (Hot Water)

Topic: 
Hydronic Heating (Hot Water and Steam)
Subtopic: 
Equipment Installation
Desired Outcome: 
Varied distribution loop temperatures match seasonal heating load
TitleSpecification(s)Objective(s)
5.3102.6a
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

5.3102.6b
Isolate reset valve location

Nearest valves on either side of valve location will be closed

Eliminate water supply to the valve location

5.3102.6c
Install reset valve and associated piping

Reset valve and associated piping will be installed between distribution supply and return headers in accordance with valve and boiler manufacturer specifications

System will be refilled and air will be eliminated

Allow distribution loop flow to the bypass boiler

5.3102.6d
Reinsulate area

Where insulation was removed, valve and associated piping 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

5.3102.6e
Determine location of outdoor sensor

Optimal outdoor location (e.g., north facing, shaded, away from heat sources and exhaust outlets, exposed to typical wind conditions, and in a secure location) will be determined by visual inspection of building exterior

Determine optimal location for outdoor sensor

5.3102.6f
Install sensors

Hot water supply sensor will be located on distribution supply header downstream of reset valve

Outdoor sensor will be installed in optimal location in accordance with manufacturer specifications

Presence and function of thermometers on supply and return headers will be verified; thermometers will be installed or replaced as necessary

Strap-on piping temperature sensors will be connected tightly to piping; piping and sensor reinsulated with new insulation in accordance with 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

Immersion-type sensors will be provided with heat transfer grease between sensor and thermowell in accordance with manufacturer specifications

Properly install sensors in optimal locations

5.3102.6g
Mount control panel

Control panel will be mounted and wired in accordance with manufacturer specifications and protected from tampering by unauthorized personnel

Ensure proper code-compliant installation of control panel

5.3102.6h
Connect sensors and valve

Sensors and valve will be connected with wiring in accordance with manufacturer specifications and protected from friction and abrasion as it passes through building components

Properly connect sensors and valve

5.3102.6i
Set up control panel

Control optimization will be followed in accordance with SWS 5.3104.5 Optimize Outdoor Reset Valve Controller (Hot Water)

Ensure optimization of control