Roberts Gorden UHA[X][S] 45 Manufactured Units, Minimum Required Installation Clearances

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 3: CRITICAL CONSIDERATIONS 3.1 Basic Information

UHA[X][S] heaters have automatic ignition burners for ON/OFF operation only.

3.2 Manufactured Units

Gas-fired, power-vented unit heater with tubular heat exchanger. Units shall have a minimum of 82% thermal efficiency. The standard unit shall consist of

anon-separated combustion design with an aluminized heat exchanger. Design and heat exchanger alternatives shall be offered as follows:

•Separated Combustion: A separated combustion unit shall consist of an enclosed sealed burner box to which combustion air is vented through a piece of internal flexible air duct. This duct terminates at an exterior cabinet flange to which a vent ran to the outside of the heated space should be attached.

•Stainless Steel Heat Exchanger: A stainless steel heat exchanger unit shall consist of heat exchanger tubes, heat exchanger tube supports, heat exchanger tube plates and a vent box produced of 409 stainless steel.

3.3Location and Suspension All models:

• Must be installed indoors.

•Must be installed in a level position with horizontal discharge.

•May be mounted on a shelf of non-combustible material using shelf mounting brackets.(See Page 11, Figure 6 and Page 12, Figure 7 for details.)

•May be suspended from above (See Page 11, Figure 5) or from wall brackets of sufficient strength to support the heater as listed in the Dimension Data Table on Page 49, Section 15.1. Drop rods must be a minimum of 3/8" diameter mild steel. Four suspension points (3/8" nuts) are located on top of the heater.

•Must be installed in a manner which allows access to all serviceable components. See Page 7, Figure 4 for details.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as indicated on Page 7, Figure 4; Page 17, Figure 9 through Page 20, Figure 14 to ensure access for servicing, and correct operation.

3.5 Clearances to Combustibles

WARNING

Fire Hazard

Some objects can catch fire or explode when placed close to heater.

Keep all flammable objects, liquids and vapors the required clearances to combustibles away from heater.

Failure to follow these instructions can result in death, injury or property damage.

Clearances must be as indicated on Page 7, Figure 4. If clearances to combustibles are not indicated, then installation clearances apply.

3.6 Ventilation

WARNING

Carbon Monoxide Hazard

Heaters may be installed vented or unvented.

Vented heaters must be vented outdoors.

Unvented heaters must be installed in buildings with ventilation rates as per section 6.4.

Failure to follow these instructions can result in death or injury.

It is important to ensure that there is adequate air space around the heater to supply air for combustion, ventilation and distribution in accordance with local and national code on Page 14, Section 6.

6