Reznor RXH (Outdoor PreevA) Unit Installation Manual - Manual (Page 24)

Form I-RDH/REH/RHH/RXH (12-14), Page 24
6.4 Unit Inlet Air
(Supply Air) -
Models RDH,
REH, RHH, and
RXH
Depending on how the unit was ordered, the blower can have a variety of factory-
installed and/or field-installed inlets. The cabinet end can be full open with or without a
screen; can have a factory-installed duct flange with or without a two-position damper,
or a field-installed hood. The blower inlet can have or not have a filter rack with filters.
Or, the blower cabinet inlet end can have an attached combination of modules includ-
ing a mixing box with either one or two inlets with duct flanges and a variety of controls,
a cooling coil module, and/or an evaporative cooling module.
6.0 Mechanical
(cont’d)
6.4.1 Optional Inlet
Duct Flange (factory
installed), Option AR5
X
Blower Cabinet
Inlet Air Opening
with Duct Flange
Option AR5 Y
3/4”(19mm) 3/4”(19mm)
3/4”
(19mm)
3/4”
(19mm)
TABLE 15 - Dimensions of Optional Inlet Air Duct Flange
RDH REH RHH RXH X Y
75/100
10A/20A/
40A
N/A 000A
inches 24-1/2 25-1/16
mm 622 636
125/150 15B/30B/
60B
N/A 000B
inches 34-1/2 25-1/16
mm 876 636
175/200
/225
N/A 130/180 000C
inches 24-1/2 37-5/16
mm 622 948
250/300 30D/60D/
90D/120D
260 000D
inches 40-3/4 37-5/16
mm 1035 948
350/
400A
40E/80E/
120E
350 000E
inches 48-3/4 37-5/16
mm 1238 948
FIGURE 18A - Optional
Inlet Air Duct Flange
on the Blower Cabinet,
Option AR5
Dimensions for attaching ductwork are shown in FIGURE 18A and TABLE 15. The
optional duct flange is 1-1/2” (38mm) long with a 3/4” (19mm) wide flange on all sides.
The inlet air duct should be attached and sealed. Ductwork must have a free area
equal to the duct connection.
6.4.2 Optional Two-Position Damper (factory installed), Option AR8 -
Models RDH, REH, RHH, RXH (requires Option AS2 Hood)
The illustration in FIGURE 18B shows a two-position damper attached directly to the
blower cabinet. If ordered with a cooling coil module, the damper will be attached to the
inlet air end of the cooling coil module. Weight added is in TABLE 5, page 10.
FIGURE 17A - Remove the
Cover from the Flue Outlet
Remove the screened box cover
on the vent outlet.
The box is attached on each side
with one screw. Remove the four
screws and the cover making the
vent pipe collar accessible.
Maximum
Height
8 feet
(2.4M)
C L
Provides
4 ft (1.2M)
vertical
clearance
between
vent outlet
and fresh
air intake
Sizes 75-150
18-3/4”
(476mm)
Sizes
175-400A
28” (711mm)
Use existing screws in cabinet top to attach
two field-supplied angles to support the vent pipe.
Recommended angle material is 3/4” x 3/4” 20 gauge.
CC1 Vent
Cap
4” is
P/N 111848;
5” is
P/N 111849
Attach a minimum of 12”
(305mm) of straight vent
pipe to the collar.
RDH Size
Vent Connection
inches mm
75, 100, 125, 150 4 102
175, 200, 225, 250,
300, 350, 400A
5 127
FIGURE 17B - Install a Vertical Vent Pipe and Cap - Maximum
height is 8 ft (2.4M).
TABLE 14 - Vent Connection Sizes
6.3.2 Venting Model RDH
A Model RDH vents through the screened “box” on the side of the heat section. If local
code requires 4-ft (1.2M) vertical clearance between the flue outlet and the fresh air
intake of the heating system or the building, install a vertical vent with an optional vent
cap. The option package includes the vent cap only. The vent pipe is field supplied.
The vent pipe should be the same size as the vent connection diameter listed below.
Remove the cover shown in FIGURE 17A and follow the illustrated instructions in
FIGURE 17B.
6.3 Venting - Models
RDH and RHH
(cont’d)