Roberts Gorden 75 Manuel D’Utilisation

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

Gas-fired, power-vented duct furnace 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 feature an enclosed, 
sealed burner box. A piece of flexible air duct 
connects this burner box to a flange on the 
cabinet. Combustion air should be ducted from 
outside the heated space, with the ductwork 
connecting to the unit with the use of the flange.

• 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 vent box 
produced of 409 stainless steel.
The use of stainless steel heat exchanger is
recommended when air inlet temperatures are 
below 40° F (4.4° C) or temperature rise is less 
than 40° F (22.2° C) as condensation may form 
on the heat exchanger resulting in corrosion that 
may shorten its life.

All models:

• Must be installed indoors.

• Must be installed on the positive pressure side of 

the air circulation blower.

• Must be installed in a level position with 

horizontal discharge.

• May be mounted on a shelf of non-combustible 

material using shelf mounting brackets.(

Page 11, Figure 6 and Page 11, Figure 7 for 
details.)

• 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.

• May be suspended from above (

Figure 5) or from wall brackets of sufficient 
strength to support the heater as listed in the 
Technical Data Table 

on Page 45, Section 16.2. 

• Must be installed in a manner which allows 

access to all serviceable components. 

6, Figure 3 for details.

Clearances around the heater and vent must be as 
indicated 

on Page 6, Figure 3 and Page 14, Figure 8 

to ensure access for servicing, and correct 
operation.

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 codes. 

12, Section 7.

It is important that the gas supply pipe is sized 
correctly to provide the inlet pressure as stated on 
the heater data plate. The gas supply pipe and 
electrical connections must not support any of the 
heater's weight. 

See Page 20, Section 9.

A permanent 120 V /1 Ø/60 Hz electrical supply is 
required for the main electrical power. The heater 
also requires suitable controls in accordance with 
Page 22, Section 10.

Choose heater orientation to allow for proper 
location of the vent. Each heater must be fitted with 
a correctly sized sealed vent system. 

If vented horizontally, no other appliance may be 
connected to the vent. 

See Page 12, Section 7.