18
DES3
Series
NOTE: Maintain a 36” minimum
distance from vent to combustion air
intake on heaters fitted with a U-bend
accessory fitting.
Chart 3.3
Minimum Distance From Burner
Control Box to Elbow or U-bend
Accessory Fitting
65 - 100
10 ft.
125
15 ft.
150 - 175
20 ft.
200
25 ft.
Models (MBH)
Dimension A
16”
16”
6”
20”
10”
20”
Tube Clamp
Tube Clamp
12.5”
12.5”
* 5EA-SUB may only be ordered at the time of heater production.
Field corrections require two (2) TR-60 packages.
Figure 3.10
•
Elbow and U-Bend Clearances
Dimension A
U-Bend can be set in both directions
12”
Figure 3.11
•
U-Bend and Elbow Dimensions
Chart 3.4
Overall Dimensions for Heaters Configured
With U-Bend (P/N: TF1B)
Model Dimension B Notes
DES3-20 13’ - 1” / 157”
N/A
DES3-30 17’ - 9” / 213”
Requires P/N: 5EA-SUB
DES3-40 22’ - 9” / 273”
N/A
DES3-50 27’ - 5” / 329”
Requires P/N 5EA-SUB
DES3-60 32’ - 5” / 389”
N/A
DES3-70 32’ - 5” / 389”
Requires P/N 5EA-SUB
3.0
Installation
•
Optional Elbow or U-Bend Accessory Configuration
Elbow can be set
in both directions
Tube Clamp
Tube Clamp
Dimension A
Dimension B
P/N: TF1B
P/N: E6
8”