Heat Transfer Phoenix, Installation & Operation Manual

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9
PREPARATION
water's pH. The pH scale ranges from 0 to 14. Water with a pH of 7.0 is considered neutral. Water
with a pH lower than 7 is considered acidic. Water with a pH higher than 7 is considered alkaline.
A neutral pH (around 7) is desirable for most potable water applications. Corrosion damage and
heater failures resulting from water pH levels of lower than 6 or higher than 8 are non-warrantable.
The ideal pH range for water used in a storage tank or a water heater system is 7.2 to 7.8.
3. Total Dissolved Solids
Total dissolved solids (TDS) is a measure of all minerals and solids that are dissolved in the water.
The concentration of total dissolved solids is usually expressed in parts per million (ppm) as
measured in a water sample. Water with a high TDS concentration will greatly accelerate lime and
scale formation in the hot water system. Most high TDS concentrations will precipitate out of the
water when heated. This can generate a scale accumulation on the heat transfer surface that will
greatly reduce the service life of a water heater. This scale accumulation can also impede the ability
of the heat exchanger to transfer heat into the water. A heat exchanger that is damaged or blocked
by lime/scale accumulation must be replaced. Failure of a water heater due to lime scale build up
on the heating surface is non-warrantable. The manufacturer of the water heater has no control
of the water quality, especially the TDS levels in your system. Total dissolved solids in excess of
2,000 ppm will accelerate lime and scale formation in the heat exchanger. Heat exchanger failure
due to total dissolved solids in excess of 2,000 ppm is a non-warrantable condition.
I. TEMPERATURE AND PRESSURE RELIEF VALVE
A temperature and pressure relief valve is installed into the marked port (upper right). We recom-
mend a WATTS 100XL-4 valve or equivalent for 100,000 BTU models, 40XL5 valve or equivalent for
130,000 BTU models or above input, meeting the requirements for relief valves for hot water heaters
as per ANSI Z21.22B by a nationally recognized lab that maintains a periodic inspection of produc-
PART 3: PREPARE WATER HEATER LOCATION
(CONTINUED)
CAUTION
Failure of a heat exchanger due to lime scale build-up on the heating surface, low pH
or other chemical imbalance is non-warrantable.
n
WARNING
Following installation of the T & P Relief Valve, the valve lever MUST be operated AT
LEAST ONCE A YEAR by the water heater owner to ensure that waterways are clear.
Certain naturally occurring mineral deposits may adhere to the valve, blocking waterways,
rendering it inoperative. When the lever is operated, hot water will discharge if the
waterways are clear. PRECAUTIONS MUST BE TAKEN TO AVOID PERSONAL INJURY
FROM CONTACT WITH HOT WATER AND TO AVOID PROPERTY DAMAGE. BEFORE
operating lever, check to see that a discharge line is connected to the valve, directing the
flow of hot water from the valve to a proper place of disposal. If no water flows when the
lever is operated, replacement of the valve is required. TURN THE WATER HEATER “OFF”
AND CALL A PLUMBER IMMEDIATELY.
This device is designed for emergency safety relief and shall not be used as an operating
control. A relief valve functions, in an emergency, by discharging water. Therefore, it is
essential that a discharge line be piped from the valve in order to carry the overflow to a
safe place of disposal. The discharge line must be same size as the valve outlet must pitch
downward from the valve and terminate at least 6" above a drain where any discharge
will be clearly visible.