Roberts Gorden Vacuum Assisted Linear - Manual (Page 14)

B LACKHEAT ® I NSTALLATION O PERATION AND S ERVICE M ANUAL
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3.3 Clearance Data -U Tube
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, tees, elbows and crosses.
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.
FIGURE 11: U-TUBE, HORIZONTAL MOUNT
Mo
del
BH15UT BH20UT BH25UT/EF BH30UT/EF BH35UT/EF BH40UT/EF BH45UT/EF BH50UT/EF
A 150 150 150 150 150 150 200 200
B 890 970 970 1020 1170 1220 1270 1380
C 1580 1730 1730 1910 1980 2050 2110 2210
D 760 940 940 1000 1090 1150 1200 1300
A
C
D B
FIGURE 12: U-TUBE, ONE SIDE REFLECTOR
Model BH15UT BH20UT BH25UT/EF BH30UT/EF BH35UT/EF BH40UT/EF BH45UT/EF BH50UT/EF
A 150 150 150 150 150 150 200 200
B 230 230 230 230 230 230 230 230
C 1580 1760 1760 1930 2090 2130 2160 2240
D 1200 1380 1380 1500 1660 1710 1760 1860
A
C
D B
FIGURE 13: U-TUBE, TWO SIDE REFLECTORS
Model BH
1
5
U
T
BH
2
0
U
T
BH
2
5
U
T
/EF
BH
3
0
U
T
/EF
BH
3
5
U
T
/EF
BH
4
0
U
T
/EF
BH
4
5
U
T
/EF
BH
5
0
U
T
/EF
A 150 150 150 150 150 150 200 200
B 590 640 640 690 820 860 890 1020
C 1660 1810 1810 1960 2110 2160 2210 2320
D 590 640 640 690 820 860 890 1020
A
C
D B
FIGURE 14: U-TUBE, FULL 45° MOUNT
Model BH
1
5
U
T
BH
2
0
U
T
BH
2
5
U
T
/EF
BH
3
0
U
T
/EF
BH
3
5
U
T
/EF
BH
4
0
U
T
/EF
BH
4
5
U
T
/EF
BH
5
0
U
T
/EF
A 200 200 200 200 200 200 200 200
B 200 200 200 200 200 200 200 200
C 1500 1650 1650 1860 1960 2040 2110 2160
D 1070 1170 1170 1320 1550 1620 1680 1780
B
C
D
A