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SECTION 5: DUCT HEATER INSTALLATION
7
SECTION 5: DUCT HEATER INSTALLATION
5.1 General
To connect the inlet and outlet ducts to the heater,
Duct-Mate or similar flanges may be slid over the
duct connector flanges supplied on the unit and
secured with screws. The connection to the duct
then can be made using the Duct-Mate clips. The
ducts must have removable access panels
upstream and downstream of the heater. These
panels must be of appropriate size and placement
so that smoke or reflected light could be observed to
indicate the presence of leaks in the heat
exchanger. Covers for these openings should be
sealed to prevent leakage.
Any transition into the inlet of the heater should be
smooth, with a taper of no more than 15°. If elbows
are required, they should be of either broad radius
or fitted with properly designed air turns. Consult a
professional to ensure air turns are properly
designed.
The heater must be installed on the positive
pressure side of the circulating air blower. Air flow
through the heater must be as shown on Page 7,
Figure 2 and may not be reversed. The air flow must
be adjusted such that it is within the acceptable
range shown on Page 7, Section 5.1.2. The minimum
inlet duct lengths shown on Page 7, Section 5.1.1
must be observed. Pressure drop through the heat
exchanger at various air flows is shown on Page 7,
Section 5.1.2.
Figure 2: Air Flow Direction
5.1.1 Minimum Inlet Duct Length
5.1.2 Temperature Rise and Pressure Drop Ranges
Model Duct Length Duct Size (W X H)
UHD[X][S][R] 150-175 52" (132 cm) 28" x 24" (71 cm x 60 cm)
UHD[X][S][R] 200-250 60" (162 cm) 28" x 32 1/4" (71 cm x 103 cm)
UHD[X][S][R] 300-400 75" (190 cm) 28" x 40 1/2" (71 cm x 82 cm)
UHD[X][S][R] 150 UHD[X][S][R] 175 UHD[X][S][R] 200 UHD[X][S][R] 225
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)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure
Drop
(in wc)
1,360 83 0.02 1,400 95 0.03 2,050 73 0.025 2,100 80 0.035
1,950 58 0.035 2,180 62 0.06 2,600 58 0.035 2,800 61 0.052
2,800 41 0.057 3,244 42 0.10 3,600 42 0.056 4,600 37 0.110
3,700 31 0.083 4,370 31 0.15 5,500 28 0.100 6,230 27 0.167
4,700 24 0.12 5,160 27 0.19 6,570 23.5 0.129 7,400 23 0.214
5,800 20 0.16 6,850 20 0.29 7,750 20 0.163 8,300 20 0.253
UHD[X][S][R] 250 UHD[X][S][R] 300 UHD[X][S][R] 350 UHD[X][S][R] 400
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)
Airflow
(CFM)
Temperature
Rise (°F)
Pressure
Drop
(in wc)
2,350 80 0.05 2,700 23 0.02 3,120 86 0.03 3,420 86 0.04
3,000 63 0.07 4,735 50 0.06 4,880 56 0.07 5,200 57 0.08
4,400 43 0.13 6,813 35 0.12 6,612 41 0.123 6,700 45 0.13
5,900 32 0.19 8,000 30 0.17 9,140 30 0.23 8,850 34 0.21
7,625 25 0.28 9,300 26 0.22 10,500 26 0.30 11,600 26 0.36
8,850 22 0.35 10,200 86 0.27 13,600 22 0.48 14,200 22 0.53