Roberts Gorden 250 Manual Do Utilizador

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The vent must be fitted with a low resistance 
terminal. 

See Page 13, Figure 6 through Page 14, 

Figure 7. Standard vented heaters do not allow 
outdoor air intake for combustion air.

The heaters are designed to be installed as 
separated combustion heaters. The vent and air 
intake are run as separate pipes to the wall or roof 
terminals. 

See Page 16, Figure 9. As an option, the 

vent and air intake are run as separate pipes to a 
concentric vent box and a concentric vent/air intake 
pipe penetrates the wall or roof. 

Figure 10 and Page 17, Figure 11.
For separated combustion installation, the vent and 
air intake must be fitted with an individual and 
correctly sized sealed system and the vent and air 
intake must terminate at approved wall and roof 
terminals.
Separated combustion units may not be common 
vented. 

See Page 11, Section 7.

This heater is not approved to be installed in 
residential buildings.
For unvented operation in commercial installations, 
sufficient ventilation must be provided in the amount 
of 4 cfm per 1000 Btu/h firing rate (United States); 3 
cfm per 1000 Btu/h firing rate (Canada).

Horizontally vented heaters must be individually 
vented.
Vent pipe must be sloped ¼" (.6 cm) for every 1' (.3 
m).  For vent lengths greater than 5' (1.5 m), 

condensation will form. Insulation is recommended 
and condensation drains may be desired.  For vents 
pitched up toward the vent terminal, place the 
condensation drain within 5' (1.5 m) of the heater. 

In noncombustible walls only, vent terminal 
(P/N 02537801-1P) may be used.

For 4'' (10 cm) vents in either combustible or 
noncombustible walls, use vent terminal (P/N 
90502100) or equivalent insulated vent terminal. 
Follow the manufacturer's instructions for proper 
installation.

Instead of an insulated vent terminal, a listed thimble 
with 2" (5 cm) air gap, may be used with a 4" (10 cm) 
vent cap (P/N 90502102).

Vertically-vented standard-vented heaters can be 
common vented (up to 4 heaters).
For vent lengths greater than 5' (1.5 m), 
condensation will form. Insulation is recommended 
and condensation drains may be desired. Vent from 
the rear of the heater cabinet then run the vent 
vertically and use a condensate drain at the bottom 
of the vertical vent.
Vent pipe must be sloped 1/4'' (.6 cm) for every 
1' (.3 m).

For 4'' (10 cm), an approved vent cap
(P/N 90502102) must be used.

For 6'' (15 cm) common vent, an approved vent cap 
(P/N 90502103) must be used.

For common vertical venting of more than two 
heaters, 

See Page 15, Figure 8.

A vent shall not extend less than 2' (.6m) above the 
highest point where it passes through a flat roof of a 
building. 

If using vent lengths greater than 5' (1.5 m), 
condensation will form in the vent pipe. Insulation 
and additional sealing measures (high temperature 
silicone at all seams) are required. 
The entire vent should be insulated with foil faced 
fiberglass insulation (1/2" thick, 1-1/2# density 
minimum).