Design for condensing systems – Detroit Radiant Products Company HLV Series User Manual
Page 12
12
HLV
Series
2.0
Design
•
Design for Condensing Systems
Simulated In-Line Systems*
HLV Burner
Model
Minimum
Distance from
Burner to First
Elbow or
Intersection (Ft.)
Calculated
Minimum
Run (Ft.)**
Calculated
Starting Point
of Condensing
Run (Ft.)
Calculated
Maximum Run
(Including
Condensing
Pipe) (Ft.)
Maximum Actual
Distance Between
Tie-Ins for Simulated
In-Line Systems (Ft.)
Starting Point
(after last tie-in)
for Condensing for
Simulated In-Line
Systems (Ft.).
40, 50, 60
10
30
60
175
50
40
75, 80
10
35
65
200
55
50
90, 100
10
40
70
200
60
50
110, 120, 125
10
45
75
225
65
60
140, 150
15
50
80
225
70
60
170, 175, 180
15
55
85
250
75
70
200
20
60
90
250
80
70
Design for Condensing Systems
Chart 2.2 •
Design Parameters for Condensing Systems
(refer to page 14 for definitions).
System tube lengths are determined by the gas input (BTU/H) of each burner. Chart 2.2 below
indicates system design parameters for each burner model used in each system. When calculating
tube lengths, do not add in elbow and tee fittings as they have been accounted for.
Designing a condensing system can be fairly straightforward given the following steps are read carefully.
In addition to these steps, an understanding of the design definitions is critical. Refer to p.14 for these
terms and illustrations.
1
Begin by designing a tentative layout without regard to design parameters. Use this approach to
place each burner and the vacuum pump where most desired (refer to Figures 2.4 - 2.10 for typical
system layouts).
2
Once a tentative layout has been established, confirm that each run in the system meets the criteria
for ‘Calculated Minimum Run’. ‘Calculated Minimum Run’ is determined by adding the total
‘Single Flow’ plus one-half of the ‘Common Flow’.
• If the system does not meet the ‘Calculated Minimum Run’, length must be added to the run until
all burners meet the design parameters.
3
Refer to Chart 2.2 to determine the ‘Calculated Starting Point of Condensing Run’ for each individual
burner run. All elbows and intersections that fall within the condensing section of run, must also
utilize condensing pipe. If there are no runs long enough to utilize condensing pipe, then the system
is regarded as a non-condensing system.
IN-LINE SYSTEMS: If the system requires the simulation of in-line burners, all tie-in burners
(Figure 2.1) must be located no less than the ‘Minimum Distance from Burner to First Elbow or
Intersection’; also reference ‘Maximum Actual Distance Between Tie-Ins for Simulated In-Line
Systems’ to ensure the tie-in distance is
not exceeded. Reference Chart 2.2 to determine the
‘Starting Point for Condensing for Simulated In-Line Systems’.
When using an in-line approach,
skip to step 5.
NOTE: Contact the factory for approval when system design exceeds the guidelines set forth in the
table above.
* Actual run; not calculated.
**
Be sure to account for runs where Tandem Tee Set (V-TTS) are
used in the system.