UFC 3-420-01
25 October 2004
Engineering Command (FEC,) Engineering Field Division (EFD) or Engineering Field
Activity (EFA)."
IPC CHAPTER 5 "WATER HEATERS" SUPPLEMENTS.
A.
SECTION 501.2 Water heater as a space heater. Replace the first
sentence with the following: "Where a combination potable water heating and space
heating system requires water for space heating at temperatures of 140F (60C) and
higher, a tempering valve shall be provided to limit the water to the potable hot water
distribution system. The valve shall be set to deliver 110F (43C) water to the fixtures
except where higher temperatures are required by specialized equipment as indicated in
ASHRAE Handbook Applications."
B.
Add "SECTION 501.9 Multiple water heaters. Provide hospitals, laundry
buildings, subsistence buildings, bachelor officers' quarters with mess and enlisted
men's barracks with mess with multiple water heaters and storage tanks. Provide other
facilities with a single water heater and storage tank. Multiple units, however, may be
justified by circumstances such as (1) facility configuration, (2) space limitations, (3)
limited access to tank room, and (4) hot water requirements necessitating an unusually
high capacity heating and storage unit. When two units are provided, each will have a
capacity equal to two thirds of the calculated load. When more than two units are
provided, their combined capacity will be equal to the calculated load."
C.
Add "SECTION 501.10 Solar water heating. Solar energy will be evaluated
as a means of meeting all or part of the hot-water requirements if required by design
instructions. Conventional back-up heating equipment will be provided for periods when
high demand or an extended period of cloudy days exceeds the capacity of the solar
energy system."
D.
SECTION 502.1 General. Add after the last sentence: "For Army projects,
control of scale formation will be provided with central water treatment on the hot-water
system. This system will be in accordance with TM 5-813-3/AFR 88-10, Vol. 3, Water
Supply, Water Treatment."
E.
SECTION 504.2 Vacuum relief valve. Add after the last sentence: "Provide
a vacuum relief valve on each copper-lined storage tank to prevent the creation, within
the tank, of a vacuum which could cause loosening of the lining."
F.
Add "SECTION 505.2 Insulation of hot water piping. Insulate service hot
water piping and storage to meet the more restrictive minimum requirements of the
following:
(1) International Plumbing Code (IPC).
(2) ASHRAE Standard 90.1, Energy Standard for Buildings Except Low-Rise
Residential Buildings."
G.
Add "SECTION 505.3 Upgrade insulation. The insulation requirements and
A-10
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