Owner Maintenance - Bock Water heaters 32 PG Instruction Manual

water out of the tap nearest the heater until it comes out warm. Using a calibrated thermome-
ter, take a measurement. If the water is not at a suitable temperature for the installation, have
a qualified service person adjust the aquastat. Contact Bock for further information if needed.
This log (or a similar one) should be filled out as follows:
Date Time
WARNING: Hydrogen gas can be produced in a hot water system served by a heater
that has not been used for a long period of time (generally two weeks or more).
Hydrogen gas is extremely flammable. To reduce the risk of injury, open the hot water
faucet at the highest location in the house for several minutes before using any
electrical appliance connected to the hot water system. If hydrogen is present, there
may be an unusual sound similar to air escaping through the pipe as the water begins
to flow. Do not smoke or allow an open flame near the faucet at the time it is open.

OWNER MAINTENANCE

Lime and Sediment: A program of regular maintenance should be established to keep your
water heater operating at peak efficiency. Important: The tank can fail prematurely from an
accumulation of lime and sediment in the bottom, excessive pressure and/or corrosion.
Prevention of these damaging factors will extend the life of your water heater appreciably.
All Power Gas models, except the 32PG, 33PG, 40PG and the 51PG, have hand holes that
permit the visual inspection of the tank interior for lime. The hand hole is large enough to
reach in and loosen such deposits by brushing or scraping. A commercial lime dissolving
chemical can also be employed. The loosened residue can be flushed away through the hand
hole or drain.
These accumulations can be controlled to an extent by softening the water or using other
water treatment systems. The tank should be inspected every six months: Drain, remove the
hand hole cover and make a visual check of the tank interior. If lime (or sediment) has accu-
mulated, remove with a commercial lime dissolving chemical or scrape loose the deposit and
flush it away through the hand hole or drain.
Excessive pressure is controlled by the pressure relief valve. Water expands when heated and
the extra volume must have a place to go. If water cannot expand into the cold water line be-
cause of a check valve or pressure regulator, pressure builds as the water heats. The pressure
relief valve opens and dumps the extra water. If the relief valve is faulty, or none has been
installed, the tank can fail due to excessive pressure. Open the relief valve at least once a
year to make sure the seat is not stuck.
Caution: Before opening the relief valve, be certain that the discharge line directs the flow
of water to the drain. Stand away from the outlet to avoid contact with the water.
Anode rods are installed in the head of the tank to help prevent corrosion. When inspecting
the tank interior for lime or sediment accumulations, also inspect the condition of the anode
rods. When the diameter of either rod has eroded to about
should be replaced.
Electrolysis can be reduced by installing a copper wire between the hot and cold piping.
Dielectric connections will also help reduce electrolysis.
Hydrogen gas can be produced in a hot water system that has not been used for an extended
period (two weeks or longer). Hydrogen gas is extremely flammable. To prevent possible
injury, we recommend that a hot water faucet be wide open for several minutes before using
Power Gas
Person running test Set temp °F
1
⁄ of its original diameter, it
3
Outlet temp °F
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