53
J. STARTUP AND OPERATION
J.5.1.3. Verifying BTU Performance and
Capacity
Checking furnace input is important to prevent
over-firing beyond its design rated input.
NEVER SET INPUT ABOVE THAT SHOWN ON
THE RATING PLATE FOR ELEVATIONS UP
TO 2,000 FT
. Use the following table or formula
to determine input rate. Start the furnace and
measure the time required to burn on cubic foot
of gas. Prior to checking the furnace input, make
certain that all other gas appliances are shut off,
with the exception of pilot burners.
Time the meter with only the furnace in operation.
The factory installed orifice o n a f urnace a re
sized for natural gas having a heating value of
1050 BTU/cu.ft and a specific gravity of 0.60.
Since heating values vary geographically, the
manifold pressure and/or gas orifice s ize may
need to be changed to adjust the furnace to its
nameplace input. Consult the local gas utility to
obtain the yearly average heating value. Refer
to section
G.4.2.6. Orifice Selection and High
Altitude Adjustments
for more info.
NOTE:
Refer to the High Altitute Section of this
manual and the National Fuel Gas Code for high
altitude rate adjustement above 2,000 ft.
To change the orifice spuds, s hut t he manual
gas-valve and remove the gas manifold. Replace
all the orifice with correct sizes based on the
Orifice Selection Charts, a nd c arefully replace
the manifold in its position.
J.5.1.4. To Shut Down Furnace
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance if
service is to be performed.
3. Remove control door.
4. Move control switch/knob on the gas valve to
the “OFF” position.
5. Replace control door.
WARNING:
SHOULD OVERHEATING
OCCUR OR THE GAS SUPPLY FAIL TO SHUT
OFF, SHUT OFF THE MANUAL GAS VALVE
TO THE APPLIANCE BEFORE SHUTTING
OFF THE ELECTRICAL SUPPLY. FAILURE
TO DO SO CAN RESULT IN AN EXPLOSION
OR FIRE CAUSING PROPERTY DAMAGE,
SEVERE PERSONAL INJURY OR DEATH!
J.5.1.5. Checking Air Temperatures
The importance of proper air flow over the heat
exchanger cannot be over emphasized. One of
the most commom causes of heat exchanger
failure is over-heating due to low air flow.
To determine whether the heating air flow
is correct, follow the steps to check the
temperature rise.
1. Insert a thermometer in the supply air duct
as close to the furnace as possible yet out of
a direct line from the heat exchanger. (See
Figure J.3. – A: Static Pressure and Air Temp
Measurement Location
)
2. Insert a thermometer in the return air duct as
close to the filters as possible.
3. Operate the furnace for a minimum of 15
minutes in the gas heat mode.
4. When the thermometer in the supply air
duct stops rising (approximaterly five minutes),
subtract the return air temperature from the
supply air temperature. The difference is the
temperature rise.
5. Compare the measured temperature rise
to the approved temperature rise range listed
on the furnace name plate or in
Appendix E:
Heating Performance
.
If the measured temperature rise is above the
approved range, the air flow is too low. Airflow
must be increased by removing the restrictions
in the duct system, or by changing the air flow.
If the measured temperature rise is below the
approved range, the air flow is too much. Check
the duct sizing or see Section
J.3.2. Air Flow
Measurements and Adjustments
.
IMPORTANT:
Some high-efficiency filters have
a greater than normal resistance to airflow.
This can adversely affect furnace operation.
BE
SURE TO CHECK THE AIRFLOW
if using any
filter other than the factory-provided filter.
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