Owners Manual

16 VENTED ROOM HEATERS
OPERATING YOUR HEATER
Start-Up Procedure
Start the heater using the procedures in the section
“Operating Your Heater”.
WARNING: Danger of bodily injury or death.
propane gas is heavier than air and it will settle in
any low area, including open depressions and it will
remain there unless the area is ventilated.
Never attempt to start-up the unit before thoroughly
ventilating the area.
Check the heater operation as outlined in the following
instructions. If any sparking, odors or unusual noises are
encountered, shut off the electric power immediately.
Recheck for wiring errors or obstructions in or near the
fan motor.
CHECK GAS INPUT AND PRESSURES
For heaters located at elevations between sea level and
2,000 feet, the measured input must not be greater than
the input shown on the rating plate of the heater. For
elevations above 2,000 feet, the measured input must not
exceed the input on the rating plate reduced by 4 percent
for each 1,000 feet that the heater is above sea level.
Gas supply pressure and manifold pressure with the
burners operating is specified on the rating plate.
Rated input will be obtained on a heating value of 2,500
BTU/hr. for propane at 10-inches manifold pressure with
factory-sized orifices. If propane gas having a different
heating value is supplied, orifices must be changed by a
qualified service technician before the heater is operated.
CHECK THERMOSTAT
Check the thermostat operation. When set above room
temperature shown on the thermostat, the main burner
should light. Make certain the thermostat turns off the
heater when the room temperature reaches the selected
setting and starts the heater when the room temperature
falls a few degrees.
CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate
measuring the manifold gas pressure. A “U Tube”
manometer having a scale range from 0 to 12-inches of
water should be used for this measurement. The manifold
pressure must be measured with the burner and pilot
operating. Any major changes in flow must be made by
changing the size of the burner orifice.
Check with your local gas supplier for proper orifice sizing.
TYPE OF GAS MANIFOLD PRESSURE, IN. W.C.
NATURAL 4.0"
PROPANE 10.0"
CHECK THE GAS INPUT (NATURAL GAS ONLY)
WARNING: Natural gas heating value (BTU per
cubic foot) can vary significantly. Therefore, it is the
installer’s responsibility to see that BTU/hr. input to
the heater is adjusted properly. Failure to do so could
cause combustion chamber failure, asphyxiation,
fire or explosion resulting in damage, bodily injury or
death. Refer to the National Fuel Gas Code (NFPA 54)
to be sure the heater is burning fuel at the proper rate.
Under firing could cause inadequate heat, excessive
condensation or ignition problems. Over firing could
cause sooting, flame impingement or overheating of the
combustion chamber.
Before starting natural gas input check, obtain heating
value of the gas (BTU per cubic foot) at standard
conditions from your local supplier.
To measure the input, using the gas meter, proceed as
follows:
1. Turn off gas supply to all other appliances except
the heater.
2. With the heater operating, time the smallest dial on
the meter for one complete revolution. If this is a
2-cubic-foot dial, divide the seconds by 2. If this is a
1-cubic-foot dial, use the time in seconds as is
(3,600 = Sec/hr.). This gives the seconds per cubic foot
of gas being delivered to the heater.
3. Assuming natural gas with a heating value of 1,000
BTU per cubic foot and 34-seconds per cubic foot used
as determined by step (2), then:
Input = 1,000 x 3,600 / 34 = 106,000 BTU/hr.
This measured input must not be greater than the
input indicated on the nameplate of the heater.
4. Relight all other appliances turned off in Step 1 above.
Be sure all pilots are operating.
CHECK PILOT BURNER
The pilot flame must envelop 1/2- to 5/8-inches of the
generator. Pilot flame is preset at the factory, so ordinarily
does not require field adjustment. Figure 17 On new
installations, the gas lines will be filled with air and may
take several minutes to establish a pilot flame.
FIGURE 17 Pilot Burner
FIGURE 17  PILOT BURNER