Filter
Top Products
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
833333340 60 65 70 758085 90105110120
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