Heatiator NB3933MI, NB4842M, NB4236MI D. High Altitude Installations, Fire Risk Explosion Risk

Models: NB3933M NB3630M NB3630MI NB3933MI NB4236M NB4842MI NB4236MI NB4842M

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•Gas build-up during line purge may ignite.

Ensure that gas line does not come in contact with outer wrap of appliance. Follow local codes.

Incoming gas line should be piped into the valve compartment and connected to the 1/2 in. connection on the manual shutoff valve.

Manual background WARNING

Fire Risk

Explosion Risk

Gas build-up during line purge may ignite.

Purge should be performed by qualified technician.

Ensure adequate ventilation.

Ensure there are no ignition sources such as sparks or open flames.

A small amount of air will be in the gas supply lines. When first lighting appliance it will take a short time for air to purge from lines. When purging is complete the appliance will light and operate normally.

D. High Altitude Installations

U.L. listed gas appliances are tested and approved without requiring changes for elevations from 0 to 2000 ft in the USA and Canada.

When installing this appliance at an elevation above 2000 ft, it may be necessary to decrease the input rating by chang- ing the existing burner orifice to a smaller size. Input rate should be reduced by 4% for each 1000 ft above a 2000 ft elevation in the U.S.A., or 10% for elevations between 2000 and 4500 ft in Canada. If the heating value of the gas has been reduced, these rules do not apply. To identify the prop- er orifice size, check with the local gas utility.

If installing this appliance at an elevation above 4500 ft (in Canada), check with local authorities.

Manual background WARNING

CHECK FOR GAS LEAKS

Fire Risk

Explosion Risk

Asphyxiation Risk

Check all fittings and connections.

Do not use open flame.

After the gas line installation is complete, all connections must be tightened and checked for leaks with a commercially available, non-corrosive leak check solution. Be sure to rinse off all leak check solution following testing.

Fittings and connections may have loosened during shipping and handling.

Manual background WARNING

Fire Risk

Explosion Risk

Do NOT change the valve settings.

This valve has been preset at the factory.

Changing valve settings may result in fire hazard or bodily injury.

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Heatilator • Novus BV-Mesh4031-553 Rev F • 11/07

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Heatiator NB3933MI D. High Altitude Installations, Fire Risk Explosion Risk, Gas build-upduring line purge may ignite