Power Venter Sizing & Installation - Field Controls SWG-3 Product Manual

SWG/CV POWER VENTER
SIZING THE VENTER
Size the SWG or ComboVent venter based on the input firing rate of the appliance. If the power venter is being used to vent
multiple appliances, add the input firing rates for each appliance and use that total to size the venter. Knowing the total input
BTU/hr. for gas, or GPH for oil, the installer can size the vent from
GPH for installation. If the input of the appliance is higher than the maximum allowable for that size SWG or CV, move to the next
larger size SWG or CV.
Do not select a venter with a maximum BTU/hr. or GPH lower than the appliance. The equivalent feet of vent pipe for the
installation must be calculated. Based on the vent pipe diameter to be used, compare the calculated equivalent feet of vent pipe
with the maximum equivalent feet allowable for the venter (See
allowed for the venter, increase the diameter of the vent pipe to be used and refer to the table or use the next larger size
SWG or CV venter.
NOTE: IN TABLE 1, THE MAXIMUM EQUIVALENT FOOTAGE ALLOWABLE FOR THE VENT PIPE IS GIVEN FOR TWO POINTS, THE MAXIMUM BTU/HR.
VENTING CAPACITY AND AT 60% OF THE MAXIMUM. THIS ALLOWS FOR ESTIMATING VALUES BETWEEN THE TWO GIVEN POINTS.
Table 1
SIZING THE VENTER (USE MAXIMUM BTU OR GPH INPUT)
MODEL
SWG-3
SWG-4HD, 4HDS, CV-4
SWG-5, 5S, CV-5
SWG-6, 6S
SWG-8
NOTE: CONTROL KITS ARE REQUIRED FOR OPERATION OF THE SWG. STAINLESS STEEL RECOMMENDED FOR OIL APPLICATIONS.
* OIL: SELECT VENTER ACCORDING TO THE ACTUAL RATED MAXIMUM GPH INPUT. SWG GPH RATINGS AT 100 PSI. DO NOT EXCEED MAXIMUM OIL GPH INPUT.
4
MAX* OIL MAX* OIL MAX** GAS
GPH INPUT GPH INPUT
100PSI 140PSI
N/A N/A 70,000
1.10 .90 170,000
1.85 1.55 290,000
2.65 2.25 416,000
4.75 4.0 740,000
Table 1. Select the venter rated closest to the total input BTU or
Table 1). If the calculated equivalent feet is greater than that
MAXIMUM EQUIVALENT FEET OF VENT PIPE
BTU/HR.
AT MAX
INPUT
BTU/HR. INPUT
21
50
35
65
100
100
16
51
95
100
28
68
100
26
51
70
VENT
AT 60% OF MAX
PIPE SIZE
BTU/HR. INPUT
80 3"
100 4"
100 4"
100 5"
100 6"
100 7"
44 4"
100 5"
100 6"
100 7"
78 5"
100 6"
100 7"
72 7"
100 8"
100 9"
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