Roberts Gorden BH70DL/EF User Manual
B
LACKHEAT
®
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
8 of 74
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.
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