Roberts Gorden NDUSTRIA NHE Series, Installation, Operation & Service Manual

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NHE-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
6
NOTE:
1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream
from where the burner and burner tube connect.
FIGURE 6: U-TUBE, LEVEL REFLECTOR
(inches) (centimeters)
Model A B C D A B C D
NHE-40
- UNAPPROVED -
- UNAPPROVED -
NHE-60 6 35 63 30 16 89 161 77
NHE-80 6 38 69 37 16 97 176 94
NHE-100 6 40 76 39 16 102 194 100
NHE-125 6 46 79 43 16 117 201 110
NHE-150 6 50 84 47 16 127 214 120
NHE-175 8 54 87 51 21 138 221 130
A
C
D B
FIGURE 7: U-TUBE, 45
°
(inches) (centimeters)
Model A B C D A B C D
NHE-40
- UNAPPROVED - - UNAPPROVED -
NHE-60 8 8 60 42 21 21 153 107
NHE-80 8 8 66 46 21 21 168 117
NHE-100 8 8 74 52 21 21 188 133
NHE-125 8 8 78 61 21 21 199 155
NHE-150 8 8 84 66 21 21 214 168
NHE-175 8 8 85 70 21 21 216 178
B
C
D
A
FIGURE 8: U-TUBE, OPPOSITE 45
°
REFLECTOR
(inches) (centimeters)
Model A B C D A B C D
NHE-40
- UNAPPROVED - - UNAPPROVED -
NHE-60 8 54 60 22 21 138 153 56
NHE-80 8 60 66 22 21 153 168 56
NHE-100 10 64 74 22 26 163 188 56
NHE-125 10 70 78 22 26 178 199 56
NHE-150 12 74 84 22 31 188 214 56
NHE-175 12 76 85 22 31 194 216 56
A
C
D
B