Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 24)

Form I-PDH/SDH/PEH/SHH/PXH, Page 24
6.4.4 Optional Mixing
Box (factory installed)
- Models PDH, SDH,
PEH, SHH, PXH
If the installation includes an Option MXB1 mixing box, it is factory installed in one of
the configurations illustrated in FIGURE 17. The configuration and damper control (GE
Option, Paragraph 6.4.4.3) was determined when the unit was ordered.
GD1 GD2
GD3
GD4
GD5
Side Views - Arrows represent inlet airflow.
One Rear
Inlet
One Bottom
Inlet
One
Top Inlet
Two Inlets
(Bottom & Rear)
Two Inlets (Top
& Rear)
FIGURE 17 -
Option MXB1
Mixing Box
Configurations
6.4.4.1 Mixing Box Configurations
All mixing box inlet air openings have a duct flange. (See dimensions in FIGURE 18
and TABLE 16.) All inlet air ducts should be attached and sealed. A return air duct
must have a free area equal to the return duct connection.
Top
Inlet Air
Opening
15-9/16”
(395mm)
34-17/32” (877mm)
31-1/16” (789mm)
2-11/32”
(60mm)
Hinged
Access
Panels
(Both Sides)
Airflow
into attached
blower cabinet
31-1/16” (789mm)
35-9/16” (903mm)
Bottom
Inlet Air
Opening
E
F
A
D
B
C
3/4” (19mm) 3/4”
(19mm)
18-3/8”
(467mm)
3/4”
(19mm)
3/4”
(19mm)
Rear
Inlet Air
Opening
*
**
*
of opening
of opening
of opening
FIGURE 18 - Mixing Box Dimensions (TABLE 16)
Duct flange connections are the same size for all mixing box configurations -
D x 18-3/8” (467mm) opening with 3/4” (19mm) flanges.
Top and bottom openings are symmetrical.
* Centerline of opening is at 1/2 of 18-3/8”
= 9-3/16” (1/2 of 467mm = 233.5)
** Centerline of opening is at 1/2 of
D. Dimension E applies to location of
opening for all configurations.
TABLE 16 - Option MXB1
Mixing Box Dimensions
in FIGURE 18
Model and Size A B C D E** F*
PDH/SDH PEH SHH PXH Dimensions (inches)
75/100 10A/20A/40A N/A 000A 33-3/4 36-13/32 34 22-7/8 16-59/64 19-25/32
125/150 15B/30B/60B N/A 000B 43-3/4 36-13/32 34 26-1/2 21-59/64 19-25/32
175/200/ 225 N/A 130/180 000C 33-3/4 45-21-32 43-1/4 22-7/8 16-59/64 24-13/32
250/300 30D/60D/90D/120D 260 000D 50 45-21-32 43-1/4 34-3/4 25-3/64 24-13/32
350/400A 40E/80E/120E 350 000E 58 45-21-32 43-1/4 45-13/16 29-3/64 24-13/32
PDH/SDH PEH SHH PXH Dimensions (mm)
75/100 10A/20A/40A N/A 000A 857 925 864 581 430 502
125/150 15B/30B/60B N/A 000B 1111 925 864 673 557 502
175/200/ 225 N/A 130/180 000C 857 1160 1099 581 430 620
250/300 30D/60D/90D/120D 260 000D 1270 1160 1099 883 636 620
350/400A 40E/80E/120E 350 000E 1473 1160 1099 1164 738 620
6.4.4.2 Mixing Box
Dimensions
6.0 Mechanical
(cont’d)
6.4 Unit Inlet Air (Supply Air) (cont’d)