BOCK EzFit EZ 100-76N Gebrauchsanweisung - Seite 6

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SECTION IV: INSTALLATION

WATER CONNECTIONS

This water heater incorporates fittings that contain a nonmetallic lining. DO NOT apply

heat to these fittings when making sweat connections to the heater. Sweat tubing to

an adapter before securing adapter to any fittings on water heaters.

ALL PIPING SHOULD CONFORM TO LOCAL CODES AND ORDINANCES. It is highly

recommended that unions and shut-off valves are installed at the potable water connections

to allow for isolation and/or movement during service. All piping should be adequately

insulated with an approved material to minimize heat loss.

POTABLE WATER CONNECTIONS

THE WATER HEATER MUST BE FILLED WITH WATER BEFORE LIGHTING THE

BURNER.

1) Close the main water supply valve before continuing with the installation. After the

main water supply is shut-off, relieve the water line pressure by opening a faucet. Once the

pressure has been relieved, close the faucet. The "Cold" and "Hot" potable water connections

are labeled on the water heater. Install a union and shut-off valve at both potable water

connections. All piping should be 3/4" diameter new copper or larger. A tempering valve

or anti-scald valve should be installed at the potable water outlet and used according to the

manufacturer's specifications to prevent scalding.

2) If a backflow preventer is required in the cold water supply, a properly sized expansion tank

must be installed to control thermal expansion. Do not operate the water heater in a closed

system without installing a thermal expansion tank. Follow the expansion tank manufactur-

er's recommendations when selecting a tank for your system.

3) Following installation of the water lines, open the main water supply valve and fill the

water heater. Open several hot water faucets to relieve air from the system. After water is

flowing through the faucets and the system is void of air, close the faucets and check for water

leaks in the system.

Note: Do not try to heat hard water as this will drastically reduce heater life. Install a water

softener or other scale reducing water treatment system if the water heater is being installed in

a hard water area (water hardness higher than seven grains).

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CAUTION

Atmospheric Gas

SECTION IV: INSTALLATION (cont .)

GAS CONNECTIONS

Do not use this water heater with any gas other than the type listed on the rating label.

Check the rating label on the front of the water heater and make sure the gas to be used

matches the gas stated on the rating label. Consult your local gas company or Bock Water

Heaters with any questions.

A manual valve, union, and a sediment trap should all be provided in front of the gas

thermostat. All gas piping must conform to local codes and/or the National Fuel Gas Code,

ANSI 223.1/NFPA 54 (latest edition).

Supply piping should be sized according to the charts found in the National Fuel Gas Code

for natural gas applications.

Note: When sizing the gas piping to the heater, make sure that the pressure at the valve is

sufficient when all other appliances are operating. Undersized gas piping will reduce water

heater performance and life as well as result in nuisance lockouts. Also verify that the gas

service and meter are sized properly for the load.

Gas piping should be carried oversize, i.e.:

within 2 feet of the valve itself. This sustains pressure at the valve during start-up to prevent

flashbacks caused by momentary pressure loss. For natural gas, 5" W.C. pressure must be

maintained upstream of the gas valve during operation. For LP gas, a minimum of 11" W.C.

must be maintained upstream of the gas valve. A

installed upstream of the manual shut-off valve to check incoming gas pressure.

During pressure testing of the gas supply piping, close the manual gas shut-off valve to the

water heater. Test pressure shall not exceed

⁄

PSIG. To test at pressure greater than

disconnect the gas operating valve.

Turn on gas and inspect piping for leaks by "painting" each joint with soap and checking for

bubbles. Do not use open flame. The pipe thread compound that is used on gas piping must

be of the type resistant to propane gas. Do not use teflon tape on gas piping. Note: For high

altitude applications (above 2000 feet) contact Bock Water Heaters.

DRAFT HOOD AND VENTING

This water heater must be installed with the factory supplied draft hood. See Figure 3 for

placement. Vent connectors must be attached to the draft hood to connect the water heater to

the gas vent or chimney. The vent connector must be the same diameter as the outlet of the

draft hood. Never use a smaller diameter vent connector. Horizontal vent connectors must be

pitched upward to the chimney at least 1/4" per foot of length. Vent connector joints should

be securely fastened with sheet metal screws. For further specifications, see the National Fuel

Gas Code (NFPA 54).

Substitution, elimination or relocation of the draft hood will result in unsafe operation

and void the warranty of your water heater. Improper venting or misuse of the draft

hood can result in unsafe operation causing bodily injury, explosion, fire or death. To

avoid the risk of fire, explosion, or asphyxiation from carbon monoxide, NEVER operate

this water heater unless it is properly vented and has an adequate air supply.

When replacing an existing water heater, the original venting system may no longer be

sized to properly vent the attached heaters. Improperly sized venting systems can lead

to the formation of condensate, leakage, and/or spillage.

Atmospheric Gas

CAUTION

⁄

inch or 1 inch or larger for

⁄

inch valve to

⁄

inch NPT pipe connection should be

⁄

PSIG (14" W.C). The gas valve is only rated for

⁄

PSIG, close the manual shut-off valve and

DANGER

CAUTION

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