UTICA BOILERS UBSSC-050 Installation, Operation & Maintanance Manual page 20

FIGURE 6-4
1" (2.54cm)
Maximum
Combustion
Air
Combustion Air
Elbow fi eld
supplied
6 - COMBUSTION AIR AND VENT PIPING
1"(2.54cm)
Maximum
Vent
FIGURE 6-7
OD 3½" - *2"
(8.9cm)
OD 4½" - 3"
(11.4cm)
*2 or 3" (5.0 or 7.6cm) Diameter
PVC intake/combustion air
*2" (5.0cm) Diameter = 41" Length (1.0m))
3" (7.6cm) Diameter = 47" Length (1.2m)
** Note Overall length may be modifi ed by cutting or
extending both combustion air and vent pipes. 12" is
minimum allowable length and 60" is maximum allowable
length for this dimension. SDR-26 PVC (D2241) only may
be used for extending pipes. Do not use Schedule 40 PVC
or use couplings to extend pipes. Dimension will change if
intake/vent pipes are lengthened or shortened.
* Note: 2" For use with models 050/075/100.
3" For use with models 075/100/150/200
FIGURE 6-5
1" (2.54cm)
Maximum
* See Note
Below
Combustion
Air
*Must be less than 4" or greater than 24" Horizontal dis-
tance between end bells of each air intake to prevent fl ue
gas recirculation.
Note: Securing strap must
be fi eld installed to prevent
movement of termination
kit in side wall
kit
(5.0cm)
kit
(7.6cm)
**See
Note
46-3/4" (1.2 m)
20
Roof overhang
12" (30cm) Minimum
36"(0.9m) Minimum
Maintain 12"
Maintain 12"(30cm) clearance above
Vent
clearance above highest
highest anticipated
anticipated snow level or snow level or grade
grade
Combustion Air
Vent
1"(2.54cm)
Maximum