Page 68 - 2018_IPC

WATER SUPPLY AND DISTRIBUTION

building maintenance. In nonresidential occupancies, hot 607.2.2 Piping for recirculation systems having master
water shall be supplied for culinary purposes, cleansing, thermostatic valves. Where a thermostatic mixing valve
laundry or building maintenance purposes. In nonresidential is used in a system with a hot water recirculating pump,
occupancies, hot water or tempered water shall be supplied the hot water or tempered water return line shall be routed
for bathing and washing purposes. to the cold water inlet pipe of the water heater and the cold
water inlet pipe or the hot water return connection of the
607.1.1 Temperature limiting means. A thermostat con-
trol for a water heater shall not serve as the temperature thermostatic mixing valve.
limiting means for the purposes of complying with the 607.3 Thermal expansion control. Where a storage water
requirements of this code for maximum allowable hot or heater is supplied with cold water that passes through a check
tempered water delivery temperature at fixtures. valve, pressure reducing valve or backflow preventer, a ther-
mal expansion control device shall be connected to the water
607.1.2 Tempered water temperature control. Tem- heater cold water supply pipe at a point that is downstream of
pered water shall be supplied through a water temperature all check valves, pressure reducing valves and backflow pre-
limiting device that conforms to ASSE 1070/ASME venters. Thermal expansion tanks shall be sized in accor-
A112.1070/CSA B125.70 and shall limit the tempered dance with the tank manufacturer’s instructions and shall be
water to not greater than 110ºF (43ºC). This provision sized such that the pressure in the water distribution system
shall not supersede the requirement for protective shower shall not exceed that required by Section 604.8.
valves in accordance with Section 412.3.
607.4 Flow of hot water to fixtures. Fixture fittings, faucets
607.2 Hot or tempered water supply to fixtures. The devel- and diverters shall be installed and adjusted so that the flow
oped length of hot or tempered water piping, from the source of hot water from the fittings corresponds to the left-hand
of hot water to the fixtures that require hot or tempered water, side of the fixture fitting.
shall not exceed 50 feet (15 240 mm). Recirculating system
piping and heat-traced piping shall be considered to be Exception: Shower and tub/shower mixing valves con-
sources of hot or tempered water. forming to ASSE 1016/ASME A112.1016/CSA B125.16
or ASME A112.18.1/CSA B125.1, where the flow of hot
607.2.1 Circulation systems and heat trace systems for water corresponds to the markings on the device.
maintaining heated water temperature in distribution
systems. For Group R2, R3 and R4 occupancies that are [E] 607.5 Insulation of piping. For other than Group R2, R3
three stories or less in height above grade plane, the instal- and R4 occupancies that are three stories or less in height
lation of heated water circulation and temperature mainte- above grade plane, piping to the inlet of a water heater and
nance systems shall be in accordance with Section piping conveying water heated by a water heater shall be
R403.5.1 of the International Energy Conservation Code. insulated in accordance with Section C404.4 of the Interna-
For other than Group R2, R3 and R4 occupancies that are tional Energy Conservation Code. For Group R2, R3 and R4
three stories or less in height above grade plane, the instal- occupancies that are three stories or less in height above
lation of heated water circulation and heat trace systems grade plane, piping to the inlet of a water heater and piping
shall be in accordance with Section C404.6 of the Interna- conveying water heated by a water heater shall be insulated in
tional Energy Conservation Code. accordance with Section R403.5.3 of the International
Energy Conservation Code.
607.2.1.1 Pump controls for hot water storage sys-
tems. The controls on pumps that circulate water
between a water heater and a storage tank for heated SECTION 608
water shall limit operation of the pump from heating PROTECTION OF POTABLE WATER SUPPLY
cycle startup to not greater than 5 minutes after the end
of the cycle. 608.1 General. A potable water supply system shall be
designed, installed and maintained in such a manner so as to
607.2.1.2 Demand recirculation controls for distri- prevent contamination from nonpotable liquids, solids or
bution systems. A water distribution system having gases being introduced into the potable water supply through
one or more recirculation pumps that pump water from cross connections or any other piping connections to the sys-
a heated water supply pipe back to the heated water tem. Backflow preventer applications shall conform to Table
source through a cold water supply pipe shall be a 608.1, except as specifically stated in Sections 608.2 through
demand recirculation water system. Pumps shall have 608.17.10.
controls that comply with both of the following:
608.2 Plumbing fixtures. The supply lines and fittings for
1. The control shall start the pump upon receiving a plumbing fixtures shall be installed so as to prevent backflow.
signal from the action of a user of a fixture or Plumbing fixture fittings shall provide backflow protection in
appliance, sensing the presence of a user of a fix- accordance with ASME A112.18.1/CSA B125.1.
ture, or sensing the flow of hot or tempered water 608.3 Devices, appurtenances, appliances and apparatus.
to a fixture fitting or appliance.
Devices, appurtenances, appliances and apparatus intended to
2. The control shall limit the temperature of the serve some special function, such as sterilization, distillation,
water entering the cold water piping to 104°F processing, cooling, or storage of ice or foods, and that con-
(40°C). nect to the water supply system, shall be provided with pro-

2018 INTERNATIONAL PLUMBING CODE ® 51
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.