5
Hot Surface Ignition Models Service Manual
SPECIFICATIONS
I.
GENERAL SPECIFICATIONS
1. Fuel Selection
One of the most critical specifications for trouble-free opera-
tion is the use of a clean, acceptable fuel. Listed below are
guidelines and comments concerning operation of heaters
with different fuels.
RECOMMENDED
COMMENTS
FUELS
Kerosene
Fuel Oil No.1
Jet "A"
ALTERNATE FUELS
COMMENTS
Fuel Oil No. 2
Diesel No. 1
Diesel No. 2
2. Electrical
The heater must be connected to a standard electrical outlet
(120V/60HZ). For safety, all heaters are equipped with a three
prong power cord, which must be grounded. When selecting
an extension cord for heater usage, the following chart should
be used in determining wire size.
LENGTH OF CORD
WIRE SIZE (AWG)
100 Ft.
No. 14
200 Ft.
No. 12
300 Ft.
No. 10
400 Ft.
No. 8
No. 6
Best overall results. Minimum odor and
minimum maintenance. No additives
necessary for cold weather operation.
Noticeable increase in odor. Requires
frequent maintenance of fuel filter
and nozzle. Requires a winterizing
additive at temperatures below 20
°
F
3. Ventilation
The heater should be used only in well-ventilated areas. As a
rule, the following minimum requirements should be followed.
HEATER SIZE (BTU)
SQUARE FOOT OPENING
35,000/40,000
1.0 Sq. Ft.
50,000/55,000/60,000
1.6 Sq. Ft.
70,000
2.1 Sq. Ft.
110,000/115,000
3.2 Sq. Ft.
150,000/155,000
4.5 Sq. Ft.
165,000
5.0 Sq. Ft.
200,000
6.0 Sq. Ft.
The above is based on ventilation requirements of at least a
3 sq. ft. opening per 100,000 BTU. If possible, it is better to
provide cross-ventilation to achieve better air movement.
4. Heater Sizing
The user should be aware of the proper size heater needed
for a particular application. It is easy to see that a 35,000 BTU
heater would not heat a large warehouse, but the question is
sometimes asked "What size heater should I use?" A simple
formula that can be used to determine heater BTU require-
ments follows:
Cu. Ft. of Area X .133 X Desired Temp. Rise
°
F = BTU Size
Needed.
Example:
Area: 50' X 25' X 10' = 12,500 Cu. Ft.
Desired Temp. Rise: 30
°
F
12,500 (Cu. Ft.)
X .133 (Factor)
1662.5
X 30 (Temp. Rise)
49,875 (Proper Heater Size)
ANSWER:
A 50,000 BTU
heater should be selected
for this application.
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