Roberts Gorden 45 Manual Do Utilizador

6 

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 
a non-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.

3.3 Location 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.

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

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.