9
VZ-VZH-VZT-IOM (08-24) 1047121-A
Table 2. Clearances
Configuration
(See Figure 4)
Model
Clearance*
Unit Size (MBTUh)**
40 60 80 100 115, 125 140, 150 175 200
Distance from Tube (Inches (cm))
A. Straight tube with
level reflector
VZ, VZT
Bottom
52 (133) 62 (158) 65 (166) 70 (178) 76 (194) 79 (201)
82 (209)
96 (244)
VZH 53 (135) 63 (161) 66 (168) 71 (181) 77 (196) 80 (204) —
All
Top 6 (16) 8 (21)
Sides 27 (69) 35 (89) 38 (97) 40 (102) 46 (117) 50 (127) 52 (133)
B. Straight tube
with level reflector
and one extension
reflector
VZ, VZT
Bottom
52 (133) 62 (158) 69 (176) 76 (194) 82 (209) 85 (216)
88 (224)
102 (260)
VZH 53 (135) 63 (161) 70 (178) 77 (196) 83 (211) 86 (219) —
All
Top 6 (16) 8 (21)
Extension
reflector side
9 (23) 18 (46)
Side opposite
extension reflector
44 (112) 47 (120) 54 (138) 59 (150) 65 (166) 69 (176) 73 (186)
C. Straight tube
with level reflector
and two extension
reflectors
VZ, VZT
Bottom
52 (133) 65 (166) 71 (181) 77 (196) 83 (211) 87 (221)
91 (232)
102 (260)
VZH 53 (135) 63 (161) 72 (183) 78 (199) 84 (214) 88 (224) —
All
Top 6 (16) 8 (21)
Sides 15 (39) 23 (59) 25 (64) 27 (69) 32 (82) 35 (89) 40 (102)
D. Straight tube
with angled reflector
VZ, VZT
Bottom
50 (127) 59 (150) 65 (166) 73 (186) 77 (196) 83 (211)
85 (216)
85 (216)
VZH 51 (130) 60 (153) 66 (168) 74 (188) 78 (199) 84 (214) —
All
Top 8 (21) 10 (26) 12 (31)
Burner side 46 (117) 54 (138) 60 (153) 64 (163) 69 (176) 74 (188) 79 (201)
Side opposite
burner
8 (21) 10 (26)
E. Straight tube with
level reflector and
optional protective
grille
VZ, VZT
Bottom
52 (133) 62 (158) 65 (166) 70 (178) 76 (194) 79 (201)
82 (209)
96 (244)
VZH 53 (135) 63 (161) 66 (168) 71 (181) 77 (196) 80 (204) —
All
Top 6 (16) 8 (21)
Sides 27 (69) 35 (89) 38 (97) 40 (102) 46 (117) 50 (127) 52 (133)
F. Straight tube with
level reflector and
optional protective
shield***
All
Bottom 27 (69) 33 (84) 38 (97) 44 (112) 48 (122) 50 (127)
—
Top 6 (16)
Sides 34 (87) 39 (100) 40 (102) 50 (127) 54 (138) 55 (140)
G. U-tube with level
reflectors
VZ, VZT
Bottom —
62 (158) 68 (173) 75 (191) 78 (199) 83 (211)
87 (221)
102 (260)
VZH 63 (161) 69 (176) 76 (194) 79 (201) 84 (214) —
All
Top — 6 (16) 8 (21)
Burner side — 35 (89) 38 (97) 40 (102) 46 (117) 50 (127) 54 (138)
Side opposite
burner
— 30 (77) 37 (94) 39 (100) 43 (110) 47 (120) 51 (130) 51 (130)
H. Angled U-tube
with level reflectors
VZ, VZT
Bottom —
59 (150) 65 (166) 73 (186) 77 (196) 83 (211)
85 (216)
85 (216)
VZH 60 (153) 66 (168) 74 (188) 78 (199) 84 (214) —
All
Top and
burner side
— 8 (21)
Side opposite
burner
— 42 (107) 46 (117) 52 (133) 61 (155) 66 (168) 70 (178)
J. U-tube with
reflectors angled in
opposite directions
VZ, VZT
Bottom —
59 (150) 65 (166) 73 (186) 77 (196) 83 (211)
85 (216)
85 (216)
VZH 60 (153) 66 (168) 74 (188) 78 (199) 84 (214) —
All
Top — 8 (21) 10 (26) 12 (31)
Burner side — 54 (138) 60 (153) 64 (163) 70 (178) 74 (188) 76 (194)
Side opposite
burner
— 22 (56)
K. Unvented heater
All
Tube side 14 (36) 20 (51)
Tube end 18 (46) 24 (61) 30 (77) 30 (77)
K. Vented heater Around vent pipe 18 (46) 18 (46)
*Bottom and side clearances can be reduced by 50% at a point 25 feet (7.5 meters) downstream from burner.
**Model VZH is not available in unit sizes 115, 140, and 200. Model VZT is not available in unit sizes 40, 60, 115, and 140.
***Clearances listed apply to when the protective shield is installed on the first 10 feet (3 meters) of tube extending from the burner cabinet.
The bottom clearances from that point are the same as those for a straight tube with a level reflector (configuration A). The protective shield is
not available for unit sizes 175 and 200.
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