Roberts Gorden BH30UT/EF User Manual
SECTION 3: C
LEARANCES
TO
C
OMBUSTIBLES
9 of 75
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.
4. Add 60 mm clearance to uncovered U-tube.
FIGURE 15: U-TUBE, OPPOSITE 45° TILT
Mo
de
l
BH15UT
BH20UT
BH25UT/EF
BH30UT/EF
BH35UT/EF
BH40UT/EF
BH45UT/EF
BH50UT/EF
A
200
200
200
250
250
275
300
300
B
1370
1530
1530
1630
1780
1830
1880
1930
C
1500
1650
1650
1860
1960
2040
2110
2160
D
560
560
560
560
560
560
560
560
A
C
D
B
FIGURE 16: U-TUBE, PROTECTIVE GRILLE
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
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 17: U-TUBE, VENTING
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
E
1000
1000
1000
1000
1000
1000
1000
1000
F
500
500
500
500
500
500
500
500
Radiant tubes
Fan
Unvented
Vented
E
F