Page 531 - 2018_IRC

HEATING AND COOLING EQUIPMENT AND APPLIANCES

the event of a stoppage of the primary drain. The pan ages and performance of maintenance without requiring
shall have a minimum depth of 1.5 inches (38 mm), the drain line to be cut.
shall be not less than 3 inches (76 mm) larger than the M1411.3.4 Appliances, equipment and insulation in
unit or the coil dimensions in width and length and pans. Where appliances, equipment or insulation are sub-
shall be constructed of corrosion-resistant material. ject to water damage when auxiliary drain pans fill, those
Galvanized sheet steel pans shall have a minimum portions of the appliances, equipment and insulation shall
thickness of not less than 0.0236-inch (0.6010 mm) be installed above the flood level rim of the pan. Supports
(No. 24 Gage). Nonmetallic pans shall have a mini-
mum thickness of not less than 0.0625 inch (1.6 mm). located inside of the pan to support the appliance or equip-
ment shall be water resistant and approved.
2. A separate overflow drain line shall be connected to M1411.4 Condensate pumps. Condensate pumps located in
the drain pan installed with the equipment. This uninhabitable spaces, such as attics and crawl spaces, shall be
overflow drain shall discharge to a conspicuous connected to the appliance or equipment served such that
point of disposal to alert occupants in the event of a when the pump fails, the appliance or equipment will be pre-
stoppage of the primary drain. The overflow drain vented from operating. Pumps shall be installed in accor-
line shall connect to the drain pan at a higher level dance with the manufacturer’s instructions.
than the primary drain connection.
M1411.5 Auxiliary drain pan. Category IV condensing
3. An auxiliary drain pan without a separate drain line appliances shall have an auxiliary drain pan where damage to
shall be installed under the coils on which condensa- any building component will occur as a result of stoppage in
tion will occur. This pan shall be equipped with a the condensate drainage system. These pans shall be installed
water level detection device conforming to UL 508 in accordance with the applicable provisions of Section
that will shut off the equipment served prior to over- M1411.3.
flow of the pan. The pan shall be equipped with a fit-
ting to allow for drainage. The auxiliary drain pan Exception: Fuel-fired appliances that automatically shut
shall be constructed in accordance with Item 1 of down operation in the event of a stoppage in the conden-
this section. sate drainage system.
4. A water-level detection device conforming to UL M1411.6 Insulation of refrigerant piping. Piping and fit-
508 shall be installed that will shut off the equip- tings for refrigerant vapor (suction) lines shall be insulated
ment served in the event that the primary drain is with insulation having a thermal resistivity of not less than
blocked. The device shall be installed in the primary R-4 and having external surface permeance not exceeding
2
drain line, the overflow drain line or the equipment- 0.05 perm [2.87 ng/(s · m · Pa)] when tested in accordance
supplied drain pan, located at a point higher than the with ASTM E96.
primary drain line connection and below the over- M1411.7 Location and protection of refrigerant piping.
flow rim of such pan. Refrigerant piping installed within 1 / inches (38 mm) of the
1
2
M1411.3.1.1 Water-level monitoring devices. On underside of roof decks shall be protected from damage
down-flow units and other coils that do not have sec- caused by nails and other fasteners.
ondary drain or provisions to install a secondary or aux- M1411.8 Locking access port caps. Refrigerant circuit
iliary drain pan, a water-level monitoring device shall access ports located outdoors shall be fitted with locking-type
be installed inside the primary drain pan. This device tamper-resistant caps or shall be otherwise secured to prevent
shall shut off the equipment served in the event that the unauthorized access.
primary drain becomes restricted. Devices shall not be
installed in the drain line.
M1411.3.2 Drain pipe materials and sizes. Components SECTION M1412
of the condensate disposal system shall be ABS, cast iron, ABSORPTION COOLING EQUIPMENT
copper, cross-linked polyethylene, CPVC, galvanized M1412.1 Approval of equipment. Absorption systems shall
steel, PE-RT, polyethylene, polypropylene or PVC pipe or be installed in accordance with the manufacturer’s instruc-
tubing. Components shall be selected for the pressure and tions. Absorption equipment shall comply with UL 1995 or
temperature rating of the installation. Joints and connec- UL/CSA/ANCE 60335-2-40.
tions shall be made in accordance with the applicable pro-
visions of Chapter 30. Condensate waste and drain line M1412.2 Condensate disposal. Condensate from the cooling
3
size shall be not less than / -inch (19 mm) nominal diame- coil shall be disposed of as provided in Section M1411.3.
4
ter from the drain pan connection to the place of conden- M1412.3 Insulation of piping. Refrigerant piping, brine pip-
sate disposal. Where the drain pipes from more than one ing and fittings within a building shall be insulated to prevent
unit are manifolded together for condensate drainage, the condensation from forming on piping.
pipe or tubing shall be sized in accordance with an M1412.4 Pressure-relief protection. Absorption systems
approved method.
shall be protected by a pressure-relief device. Discharge from
M1411.3.3 Drain line maintenance. Condensate drain the pressure-relief device shall be located where it will not
lines shall be configured to permit the clearing of block- create a hazard to persons or property.

506 2018 INTERNATIONAL RESIDENTIAL CODE ®
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.