Roberts Gorden Combat UHD-Series, Installation, Operation & Service Manual

Page: 26 / 70

UHD S
TANDARD
D
UCT
F
URNACE
I
NSTALLATION
O
PERATION AND
S
ERVICE
M
ANUAL
18 of 57
SECTION 8 : AIR SUPPLY
8 .1 Separated Combustion Installation
When installed as a separated comb u stion heater
(UHD[T][X]S[R]), the air for comb u stion is dra w n in
from o u tside the b u ilding.
8 .2 Buildin g Ventilation
Where ventilation is req u ired, air m u st be taken from
an o u tside point w here it is not likely to be
contaminated or obstr u cted.
8 .3 Outside Combustion Air Supply
If o u tside comb u stion air s u pply is req u ired,
separated comb u stion model (UHD[T][X]S[R])
heaters m u st be u sed.
Caution: If the b u ilding has a slight negative
press u re or corrosive contaminants s u ch as
halogenated hydrocarbons are present in the air, an
o
u tside comb u stion air s u pply to the heater is
req u ired. Seal all comb u stion air pipe joints.
For models 300-400, the flexible air d u ct may be
ins u lated to prevent condensation on the o u ter
s u rface. The o u tside air terminal m u st not be more
than 1' (31 cm) above the vent terminal.
8 .3.1 Len g th Re q uirements
Follo w the constraints listed on Page 13, Section 7.5 .
WARNING
Explosion Hazard
Equipment must have access to
uncontaminated air at all times.
Failure to follow these instructions can result
in death, injury or property damage.