Roberts Gorden NDUSTRIA NHE Series Installation, Operation & Service Manual page 26

NHE-S I , O
ERIES NSTALLATION PERATION AND
Step 6.6 Swirler Installation
Swirler Installation
Model Tube Section
NHE-125 3rd 10' (3 m) Section
NHE-150 4th 10' (3 m) Section
NHE-175 5th 10' (3 m) Section
Description
Swirler Starter 62" (1.6 m)
Swirler Adapter 62" (1.6 m)
Tube
22
S M
ERVICE ANUAL
Swirlers should not to be installed through 180° "U"
Swirler Qty
sections or elbows. For this reason, 15' and 20' long
2 Starters + 2 Adapters
swirler packages each contain 2 swirler starter sections
1 Starter + 1 Adapter
to allow for starter pieces to be installed before and after
2 Starters + 1 Adapter
"U" sections and elbows. Swirler starter section
identified as section with tab on end. Swirlers should be
installed as shown in figures 21 through 27.
Part Number
03051506
03051507
91409XXX
Swirler installation required for models
specified in chart below.
Begin installing swirler at end of tube section
as described in the "Swirler Installation" chart
below and continue towards burner.
Note: If heater length is extended 10' (3 m)
beyond the specified minimum heat
exchanger length swirler can begin in either
the specified tube section (according to the
"Swirler Installation" chart) or the end of the
10' (3 m) extension and continue towards
burner.