Roberts Gorden UHD[X][S][R] 200 User Manual

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UHD S
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10 
Vents and air intakes must be adequately 
supported so that the heater does not bear the 
weight of the pipes.
For vent termination See Page 11, Figure 4 through 
Page 14, Figure 9
.
6.3.1 Standard Vented Heaters 
         (Models UHD[X][R] 150 - 400)
The vent must be fitted with a low resistance 
terminal. See Page 11, Figure 4 through Page 12, 
Figure 5
. Standard vented heaters do not allow 
outdoor air intake for combustion air.
6.3.2 Separated Combustion Heaters 
         (Models UHD[X]S[R] 150 - 400)
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 14, 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. See Page 13, 
Figure 8
 and Page 14, Figure 9.
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 
terminate at approved wall and roof terminals.
Separated combustion units may not be common 
vented.  See Page 9, Section 6.
6.4 Unvented Operation
This heater is not approved to be installed in 
residential buildings. 
For unvented operation in commercial installations, 
sufficient building 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).
WARNING: Combustion by-products contain a 
chemical known to the State of California to cause 
cancer and birth defects or other reproductive harm.
6.5 Horizontal Venting
Horizontally vented heaters must be individually 
vented.
Vent pipe must be sloped ¼" (.6 cm) downward 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.   
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).
6.6 Vertical Venting
Vertically-vented standard-vented heaters can be 
common vented (up to four 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 12, Figure 6.
A vent shall not extend less than 2' (.6m) above the 
highest point where it passes through a flat roof of a 
building. 
6.7 Length Requirements
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. 
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.