Schwank duraSchwank - Steel STW-JZ - Manual (Page 25)

25
SPW-JZ, STW-JZ / IWP, IW
I&O Manual IM101229
RL: 12B- BA
RD: AUG 2013
SPECIAL COUPLER INSTALLATION
1. Note the 2 holes opposite each other at the swaged end of the first tube (flanged)
2. Install the first tube with 2 holes (swaged end) at the 3 and 9 o’clock position, with the welded
seam located in the lower half of tube, facing downward
3. Slide the loosened tube coupler on to the first tube, past the swage
4. The second tube has a
¼
” hole at the female end.
5. Slide second tube over swaged end of first tube to align the hole in the second tube with one of
the holes in the first tube
6. Final alignment of the holes can be accomplished using a screw driver or other tool
7. IMPORTANT: Insert ¼ ” rivet into the hole to secure the tube connection
8. Slide coupler into position – half onto each tube – covering the rivet head
9. Tighten coupler bolts to 40 ft-lb
10. Install reflectors
9.1 SPECIAL COUPLING: 175,000 & 200,000 Btuh
NOTE: The joint of 1ST & 2ND tubes of 175,000 & 200,000 heaters experience strong
forces of expansion. Follow instructions below for special coupling of the tubes.
FIGURE 16 SPECIAL COUPLING:
 175,000 & 200,000 Btuh - Fasten Second Tube to First Tube -
Steps 3 to 6
Step 7
Steps 8 & 9
1/4” Rivet
Welded seam in lower half of tube,
facing downward
Holes in swage of 1st tube:
locate at 3 and 9 o’clock
Steps 1
& 2