Loading...
Tempered water shall be controlled by one of the following:
1. A limiting device conforming to ASSE 1070/ASME A112.1070/CSA B125.70 and set to not greater than 100°F (43°C).
2. A thermostatic mixing valve conforming to ASSE 1017.
3. A water heater conforming to ASSE 1082.
4. A water heater conforming to ASSE 1084.
This provision shall not supersede the requirement for protective shower valves in accordance with Section 18-29-424.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
The developed length of hot or tempered water piping, from the source of hot water to the fixtures that require hot or tempered water, shall not exceed 50 feet (15 240 mm). Recirculating system piping and heat-traced piping shall be considered to be sources of hot or tempered water.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
For Group R-2, R-3, R-4 and R-5 occupancies that are four stories or less in height above grade plane, the installation of heated water circulation and temperature maintenance systems shall be in accordance with Section R403.5.1 of the Chicago Energy Conservation Code. For other than Group R-2, R-3, R-4 and R-5 occupancies that are four stories or less in height above grade plane, the installation of heated water circulation and heat trace systems shall be in accordance with Section C404.6 of the Chicago Energy Conservation Code.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
The controls on pumps that circulate water between a water heater and a storage tank for heated water shall limit operation of the pump from heating cycle startup to not greater than 5 minutes after the end of the cycle.
(Added Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
A water distribution system having one or more recirculation pumps that pump water from a heated water supply pipe back to the heated water source through a cold water supply pipe shall be a demand recirculation water system. Pumps shall have controls that comply with both of the following:
1. The control shall start the pump upon receiving a signal from the action of a user of a fixture or appliance, sensing the presence of a user of a fixture, or sensing the flow of hot or tempered water to a fixture fitting or appliance.
2. The control shall limit the temperature of the water entering the cold water piping to 104°F (40°C).
(Added Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
Where a temperature-actuated mixing valve is used in a system with a hot water recirculating pump, the hot water or tempered water return line shall be routed to the cold water inlet pipe of the water heater and the cold water inlet pipe or the hot water return connection of the temperature-actuated mixing valve.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
Where a storage water heater is supplied with cold water that passes through a check valve, pressure reducing valve or backflow preventer, a thermal expansion control device shall be connected to the water heater cold water supply pipe at a point that is downstream of all check valves, pressure reducing valves and backflow preventers. Thermal expansion tanks shall be sized in accordance with the tank manufacturer's instructions and shall be sized such that the pressure in the water distribution system shall not exceed that required by Section 18-29-604.8.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
Loading...