water heater, provide thermostatic,
pressure-balanced, or combination thermostatic and
pressure-balanced type mixing valves to obtain
water temperatures below 60 degrees C (140 degrees
F).
Ensure that values for efficiencies in Table III are
equal to or greater than the latest "recommended"
values currently released by the Department of
Energy Federal Energy Management Program (FEMP).
The latest values can be found on FEMP's Internet
site: http://www.eren.doe.gov/femp/.
Select expansion tank based on incoming water
pressure, water heater volume and temperature rise
of water. Consult expansion tank manufacturer for
sizing recommendations. Show the expansion tank
size and acceptance volume on the drawings.
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Water heater types and capacities shall be as indicated. Each water heater
shall have replaceable anodes. Each primary water heater shall have
controls with an adjustable range that includes 32 to 71 degrees C 90 to
160 degrees F. Each gas-fired water heater and booster water heater shall
have controls with an adjustable range that includes 49 to 82 degrees C 120
to 180 degrees F. Hot water systems utilizing recirculation systems shall
be tied into building off-hour controls. The thermal efficiencies and
standby heat losses shall conform to Table III, for each type of water
heater specified. The only exception is that storage water heaters and hot
water storage tanks having more than 2000 L 500 gallon storage capacity
need not meet the standby loss requirements if the tank surface area is
insulated to R-12.5 and if a standing pilot light is not used. Plastic
materials polyetherimide (PEI) and polyethersulfone (PES) are forbidden to
be used for vent piping of combustion gases. A factory pre-charged
expansion tank shall be installed on the cold water supply to each water
heater. Expansion tanks shall be specifically designed for use on potable
water systems and shall be rated for 93 degrees C 200 degrees F water
temperature and 1034 kPa 150 psi working pressure. The expansion tank size
and acceptance volume shall be [_____] [as indicated].
2.13.1
Automatic Storage Type
Heaters shall be complete with control system, [temperature gauge,] [and]
[pressure gauge,] and shall have ASME rated combination pressure and
temperature relief valve. [A phenolic resin coating shall be provided.]
2.13.1.1
Oil Fired Type
Oil fired type water heaters shall conform to UL 732.
[A phenolic resin
coating shall be provided.]
2.13.1.2
Gas Fired Type
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NOTE: To the maximum extent possible, gas-fired
type water heaters with the new Flame-Guard safety
system should be used. Since Flame-Guard is a new
technology, limited models are available.
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SECTION 15405A
Page 50
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