16
VZ-VZH-VZT-IOM (08-24) 1047121-A
CONNECTOR
SECTION
TABBED SECTION
STRING
Table 8. Swirler Applicability
Unit Size (MBTUh)
125 150, 175 200
Swirler Location*
2nd extension tube 3rd extension tube 4th extension tube
*The swirler may be installed in the last downstream extension tube if the tube assembly is extended 10 feet beyond the minimum tube
length. For additional details, refer to the APPENDIX: SWIRLER CONFIGURATIONS.
Table 9. Number of Swirlers Required
Model
Unit Size (MBTUh)
125 150 175 200
No. of Swirler Connector Sections*
VZ
4 2 3
2
VZH —
VZT — — 2 1
*Connector sections are connected to one (1) tabbed section.
INSTALLATION—CONTINUED
Tube Assembly—Continued
Figure 7. Turbulator Installation
NOTE: Swirlers are NOT USED on the following units: model VZ unit sizes 40–115 and 140, model
VZH unit sizes 40–100, and model VZT unit sizes 80–150.
3. Install swirler(s) as required (refer to Table 8 for applicability and to Table 9 for quantity):
a. Interlock swirler sections as shown in Figure 8 and slide assembly into extension tube. String may be used
as shown to position swirler.
b. Fold tab around downstream end of tube as shown in Figure 8 to secure swirler.
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