Clearance Data -U Tube; Figure 11: U-Tube, Horizontal Mount; Figure 12: U-Tube, One Side Reflector; Figure 13: U-Tube, Two Side Reflectors - Roberts Gorden Blackheat BH20UT Installation, Operation & Service Manual

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B I
LACKHEAT NSTALLATION

3.3 Clearance Data -U Tube

NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, tees, elbows and crosses.

FIGURE 11: U-TUBE, HORIZONTAL MOUNT

A
B D
C

FIGURE 12: U-TUBE, ONE SIDE REFLECTOR

A
D
B
C

FIGURE 13: U-TUBE, TWO SIDE REFLECTORS

A
D
B
C
FIGURE 14: U-TUBE, FULL 45° MOUNT
A
B
D
C
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O S M
PERATION AND ERVICE ANUAL
2. Clearances B, C and D can be reduced by 50% after 7500 mm of tubing downstream
from the burner.
3. All measurements are in millimeters.
4. Add 60 mm clearance to uncovered U-tube.
A 150 150
B 890 970
C 1580 1730
D 760 940
A 150 150
B 230 230
C 1580 1760
D 1200 1380
A 150 150
B 590 640
C 1660 1810
D 590 640
A 200 200
B 200 200
C 1500 1650
D 1070 1170
150 150 150
970 1020 1170
1730 1910 1980
940 1000 1090
150 150 150
230 230 230
1760 1930 2090
1380 1500 1660
150 150 150
640 690 820
1810 1960 2110
640 690 820
200 200 200
200 200 200
1650 1860 1960
1170 1320 1550
150 200 200
1220 1270 1380
2050 2110 2210
1150 1200 1300
150 200 200
230 230 230
2130 2160 2240
1710 1760 1860
150 200 200
860 890 1020
2160 2210 2320
860 890 1020
200 200 200
200 200 200
2040 2110 2160
1620 1680 1780