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PV500-24 03-99 Section 24 3
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WATER WITH SINGLE-WALL / DOUBLE-WALL (con't)
ELECTRICAL
The heater is wired for 120 volts and must be electrically grounded in accordance with local
codes, or in the absence of local codes, with the latest edition of the National Electrical Code
ANSI/NFPA. When unit is installed in Canada, it must conform to the CSA C22.1, Canadian
Electrical Code, Part 1 and/or local electrical codes.
1. Water must be pumped continuously
through the boiler when it is being fired.
2. Do not energize water heater or pumps
until tank is full of water. Serious
damage may result.
3. All wiring must be in accordance with all
local, state, or federal codes.
4. Provide proper overload protection for
the system's circulating pumps.
NOTE: Use only copper wire of proper sizing for incoming service. Damage
resulting from use of aluminum wiring will be excluded from coverage under
the warranty of this unit.
RELIEF VALVE PIPING
The water heater is supplied with a
pressure and temperature relief valve, sized
in accordance with ASME requirements.
Each relief valve should be piped to a
suitable floor drain. No reducing coupling or
other restriction can be installed in the
discharge line.
MAINTENANCE
1. A preventive maintenance program
should be established to assure a long,
trouble-free life for the water heater.
2. Scale will normally form in the tank
during operation and will accumulate on
the bottom of the tank. The scale is
formed from the natural chemicals in the
water that precipitate out during the
heating cycles. Some water supplies
contain more of these chemicals than
others, and the scale buildup will occur
more rapidly. Other factors affecting the
scale buildup are the amount of hot
water used and the temperature of the
water. The more hot water used, the
more fresh water containing the scale-
forming chemicals is brought into the
tank. As the temperature of the water
increases, the rate of scale deposited
will be increased. The unit should be
inspected and cleaned as required by
local water conditions.