Installation – Trane GHND-SVX01A-EN User Manual
Page 13
GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater
13
Installation
impede the warm air distribution patterns. Heat throw distances are presented in Table
2, and Figure 2A.
Note 2.
NR=Not recommended
H=Distance from floor to bottomof the unit.
Unit heaters should not be installed to maintain low temperatures and/or freeze
protection of buildings. A minimum of 50°F (10°C) thermostat setting must be
maintained. If unit heaters are operated to maintain lower than 50°F (10°C), hot flue
gases are cooled inside the heat exchanger to a point where water vapor (a flue gas by-
product) condenses onto the heat exchanger walls. The result is a mildly corrosive acid
that prematurely corrodes the aluminized heat exchanger and can actually drip water
down from the unit heater onto floor surface. Additional unit heaters should be
installed if a minimum 50°F (10°C) thermostat setting cannot be maintained.
AIR FOR COMBUSTION: The Unit Heater shall be installed in a location in which
the facilities for ventilation permit satisfactory combustion of gas, proper
venting, and the maintenance of ambient temperature at safe limits under
normal conditions of use. The Unit Heater shall be located in such a manner as not
to interfere with proper circulation of air within the confined space. When buildings are
so tight that normal infiltration does not meet air requirements, outside air shall be
introduced per Sections 1.3.4.2 and 1.3.4.3 of ANSI Z223.1 for combustion requirements.
A permanent opening or openings having a total free area of not less than one square
inch per 5,000 BTU/HR. (1.5 Kw) of total input rating of all appliances within the space
shall be provided.
Figure 5.
Heat throw distances
“H”
Unit
Heater
Floor Line
Table 2.
Standard applications, heat throw distances (approximate)
UNIT SIZE
"H"
30,000
45,000
60,000
75,000
100,000
125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000
400,000
8
33
33
33
40
60
65
70
75
80
85
90
105
110
120
10
28
28
28
35
54
56
60
64
68
72
78
90
95
100
12
NR
NR
NR
NR
44
46
49
57
61
65
68
80
84
90
15
NR
NR
NR
NR
NR
NR
45
49
52
56
60
70
74
80
20
NR
NR
NR
NR
NR
NR
NR
NR
46
50
54
63
66
70