Bananza UHD 125, Installation, Operation & Service Manual

Page: 17 / 60

SECTION 6: D
UCT
H
EATER
I
NSTALLATION
9 of 47
SECTION 6: DUCT HEATER INSTALLATION
6.1 General
To connect the inlet and o u tlet d u cts to the heater,
D u ct-Mate or similar flanges may be slid over the
d u ct connector flanges s u pplied on the u nit and
sec u red w ith scre w s. The connection to the d u ct
then can be made u sing the D u ct-Mate clips. The
d u cts m u st have removable access panels
u pstream and do w nstream of the heater. These
panels m u st be of appropriate size and placement
so that smoke or reflected light co u ld be observed to
indicate the presence of leaks in the heat
exchanger. Covers for these openings sho
u ld be
sealed to prevent leakage.
Any transition into the inlet of the heater sho u ld be
smooth, w ith a taper of no more than 15 degrees. If
elbo w s are req u ired, they sho u ld be of either broad
radi u s or fitted w ith properly designed air t u rns.
Cons u lt a professional to ens u re air t u rns are
properly designed.
The heater m u st be installed on the positive
press u re side of the circ u lating air blo w er. Air flo w
thro u gh the heater m u st be as sho w n on Page 9,
Figure 4 and may not be reversed. The air flo w m u st
be adj u sted s u ch that it is w ithin the acceptable
range sho w n on Page 9, Section 6.1.3 . The
minim u m inlet d u ct lengths sho w n on Page 9,
Section 6.1.1 sho u ld be observed. Press u re drop
thro u gh the heat exchanger at vario u s air flo w s is
given on Page 9, Section 6.1.2 .
Fi g ure 4: Air Flow Direction
6.1.1 Minimum Inlet Duct Len g th
6.1.2 Temperature Rise and Pressure Drop Ran g es
6.1.3 Air Flow and Temperature Rise Ran g es
AIR FLO W
OUTLET DUCT
I N LET DUCT
Model Duct Len g th Duct Size (W X H)
UHD[X][S] 75 32" (81 cm) 16 3/4" x 15 7/8" (43 cm x 40 cm)
UHD[X][S] 100 &125 37" (94 cm) 21 3/4" x 15 7/8" (55 cm x 40 cm)
UHD[X][S] 75 UHD[X][S] 100 UHD[X][S] 125
Airflow
(CFM)
Temperature
Rise (°F)
Pressure Drop
(in wc)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure Drop
(in wc)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure Drop
(in wc)
850 68 0.06 950 78 0.05 1,020 92 0.06
1,200 48 0.10 1,500 50 0.18 1,650 57 0.14
1,625 36 0.16 2,500 31 0.28 2,340 41 0.27
1,965 30 0.22 3,000 26 0.39 3,480 28 0.56
2,450 24 0.31 3,300 24 0.46 4,240 23 0.80
2,650 22 0.36 3,660 22 0.55 4,750 20 0.98
Model Rate Air Flow Temperature Rise
(Btu/h) Minimum (CFM) Maximum (CFM) Minimum (°F) Maximum (°F)
UHD[X][S] 75 75,000 850 2,650 22 68
UHD[X][S] 100 100,000 950 3,660 22 78
UHD[X][S] 125 125,000 1,020 4,750 20 92