Trane Gas Unit Heaters Wartungshandbuch
12
GAND-SVX01B-EN
Installation: Mechanical
Since the unit is equipped with an automatic gas ignition
system, the unit heaters must be installed such that the
gas ignition control system is not directly exposed to water
spray, rain, or dripping water.
system, the unit heaters must be installed such that the
gas ignition control system is not directly exposed to water
spray, rain, or dripping water.
Note: Location of unit heaters is related directly to the
selection of sizes (refer to
as follows:
Mounting Height.
Unit heaters must be installed at a
minimum of 8 feet (2.4 m) above the floor, measured to the
bottom of the unit. At heights above 8 feet (2.4 m), less
efficient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet (3.7 to
4.9 m) in order to clear obstacles. When this is the case, it
is advisable to use centrifugal blower unit heaters. If the
bottom of the unit. At heights above 8 feet (2.4 m), less
efficient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet (3.7 to
4.9 m) in order to clear obstacles. When this is the case, it
is advisable to use centrifugal blower unit heaters. If the
unit heater to be mounted below 8 feet (2.4 m) above the
floor, the unit heater must be equipped with an OSHA-
approved fan guard.
floor, the unit heater must be equipped with an OSHA-
approved fan guard.
Aircraft Hangers.
Unit heaters must be installed in
aircraft hangars and public garages as follows: in aircraft
hangars, unit heaters must be at least 10 feet (3.0 m) above
the upper surface of wings or engine enclosures of the
highest aircraft to be stored in the hangar, and 8 feet
(2.4 m) above the floor in shops, offices and other sections
of the hangar where aircraft are not stored or housed.
Refer to current ANSI/NFPA No. 409, Aircraft Hangars. In
Canada, installation is suitable in aircraft hangars when
acceptable to the enforcing authorities.
hangars, unit heaters must be at least 10 feet (3.0 m) above
the upper surface of wings or engine enclosures of the
highest aircraft to be stored in the hangar, and 8 feet
(2.4 m) above the floor in shops, offices and other sections
of the hangar where aircraft are not stored or housed.
Refer to current ANSI/NFPA No. 409, Aircraft Hangars. In
Canada, installation is suitable in aircraft hangars when
acceptable to the enforcing authorities.
Public Garages.
In repair garages, unit heaters must be
located at least 8 feet (2.4 m) above the floor. Refer to the
latest edition of NFPA 88B, Repair Garages.
latest edition of NFPA 88B, Repair Garages.
In parking structures, unit heaters must be installed so that
the burner flames are located a minimum of 18 inches
(457 mm) above the floor or protected by a partition not
less than 18 inches (457 mm) high. However, any unit
heater mounted in a parking structure less than 8 feet
(2.4 m) above the floor must be equipped with an OSHA
approved fan guard. Refer to the latest edition of
NFPA 88A, Parking Structures.
the burner flames are located a minimum of 18 inches
(457 mm) above the floor or protected by a partition not
less than 18 inches (457 mm) high. However, any unit
heater mounted in a parking structure less than 8 feet
(2.4 m) above the floor must be equipped with an OSHA
approved fan guard. Refer to the latest edition of
NFPA 88A, Parking Structures.
In Canada, installation must be in accordance with the
latest edition of CGA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
latest edition of CGA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
Air Distribution
Direct air towards areas of maximum heat loss. When
multiple heaters are involved, circulation of air around the
perimeter is recommended where heated air flows along
exposed walls. Satisfactory results can also be obtained
where multiple heaters are located toward the center of
the area with heated air directed toward the outside walls.
Be careful to avoid all obstacles and obstructions which
could impede the warm air distribution patterns. Heat
throw distances are presented in
multiple heaters are involved, circulation of air around the
perimeter is recommended where heated air flows along
exposed walls. Satisfactory results can also be obtained
where multiple heaters are located toward the center of
the area with heated air directed toward the outside walls.
Be careful to avoid all obstacles and obstructions which
could impede the warm air distribution patterns. Heat
throw distances are presented in
NOTICE:
Equipment Damage!
Do not install unit heaters in corrosive or flammable
atmospheres! Premature failure of, or severe damage to
the unit could result! Avoid locations where extreme
drafts can affect burner operation. Unit heaters must
not be installed in locations where air for combustion
would contain chlorinated, halogenated or acidic
vapors. If located in such an environment, premature
failure of the unit could occur!
atmospheres! Premature failure of, or severe damage to
the unit could result! Avoid locations where extreme
drafts can affect burner operation. Unit heaters must
not be installed in locations where air for combustion
would contain chlorinated, halogenated or acidic
vapors. If located in such an environment, premature
failure of the unit could occur!
Figure 6.
Heater location
Table 2.
)
“H”
(a)
Unit Size Btu/h (kW)
ft.
100,000
125,000
150,000
175,000
200,000
225,000
250,000
300,000
350,000
400,000
(m)
(29.3)
(36.6)
(43.9)
(51.2)
(58.6)
(65.9)
(73.2)
(87.8)
(102.5)
(117.1)
8
60
65
70
75
80
85
90
105
110
120
(2.4)
(18.3)
(19.8)
(21.3)
(22.9)
(24.4)
(25.9)
(27.4)
(32.0)
(33.5)
(36.6)
10
54
56
60
64
68
72
78
90
95
100
(3.0)
(16.5)
(17.1)
(18.3)
(19.5)
(20.7)
(21.9)
(23.8)
(27.4)
(29.0)
(30.5)
12
44
46
49
57
61
65
68
80
84
90
(3.7)
(13.4)
(14.0)
(20.7)
(17.4)
(18.6)
(19.8)
(20.7)
(24.4)
(25.6)
(27.4)
15
NR
NR
45
49
52
56
60
70
74
80
(4.6)
(22.6)
(14.9)
(15.8)
(17.1)
(18.3)
(21.3)
(22.6)
(24.4)
20
NR
NR
NR
NR
46
50
54
63
66
70
(6.1)
(14.0)
(15.2)
(16.5)
(19.2)
(20.1)
(21.3)
Note:
NR = Not recommended.
(a) H = Distance from floor to bottom of the unit.