Measure Natural Gas Input Rate; Measure And Adjust Temperature Rise - Amana 10759833 Installation Instructions Manual

Startup Adjustments and Measurements
6. Turn the adjustment screw clockwise to increase the
pressure, or counterclockwise to decrease the pres-
sure.
7. Securely replace the regulator cap.
8. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer.
9. Reinstall gas valve outlet pressure tap plug before
turning on gas to furnace.

Measure Natural Gas Input Rate

NOTE: The gas input rate to the furnace must never be
greater than that specified on the unit rating plate.
Use the following procedure to measure natural gas input
using the gas meter:
1. Turn OFF the gas supply to all other gas-burning ap-
pliances except the furnace.
2. While the furnace is operating, time and record one
complete revolution of the smallest gas meter dial.
3. Calculate the number of seconds per cubic foot (sec/
ft ) of gas being delivered to the furnace. If the dial is
3
a one cubic foot dial, divide the number of seconds
recorded in step 2 by one. If the dial is a two cubic
foot dial, divide the number of seconds recorded in
step 2 by two.
4. Calculate the furnace input in BTUs per hour (BTU/
hr). Input equals the sum of the installation's gas
heating value and a conversion factor (hours to sec-
onds) divided by the number of seconds per cubic
foot. The measured input must not be greater than
the input indicated on the unit rating plate.
Installation's gas heating (HTG) value: 1,000 BTU/ft
(Obtained from gas supplier)
Installation's seconds per cubic foot: 34 sec/ ft
Conversion Factor (hours to seconds): 3600 sec/hr
Input = (Htg. value x 3600) ÷ seconds per cubic foot
Input = (1,000 BTU/ft
Input = 106,000 BTU/hr
5. Repeat steps 1 through 3 on high stage (2nd stage).
NOTE: The final manifold pressure cannot vary by
more than ± 0.3" w.c. from the specified setting. Consult
your local gas supplier if additional input rate adjustment
is required.
6. Turn ON gas to and relight all other appliances
turned off in step 1. Be certain that all appliances
are functioning properly and that all pilot burners are
operating.
x 3600 sec/hr) ÷ 34 sec/ ft
3

Measure and Adjust Temperature Rise

Air temperature rise is the temperature difference between
supply and return air. Temperature rise must be within the
range specified on the unit rating plate. An incorrect tem-
perature rise could cause condensing in or overheating of
the heat exchanger. An airflow and temperature rise table
is provided in the specification sheet. Determine and
adjust temperature rise as follows:
1. Operate furnace with burners firing for approximately
ten minutes. Ensure all registers are open and all
duct dampers are in their final (fully or partially open)
position.
2. Place thermometers in the return and supply ducts
as close to the furnace as possible. Thermometers
must not be influenced by radiant heat by being able
to "see" the heat exchanger.
3. Subtract the return air temperature from the supply
air temperature to determine the air temperature rise.
Allow adequate time for thermometer readings to
stabilize.
4. Adjust temperature rise by adjusting the circulator
blower speed. Increase blower speed to reduce tem-
perature rise. Decrease blower speed to increase
temperature rise. Refer to Adjust Circulator Blower
Speeds for speed changing details.
HEAT EXCHANGER
RADIATION "LINE OF SIGHT"
3
3
3
Temperature Rise Measurement
28 28
SUPPLY
AIR
T
SUPPLY
T T
RISE =
-
SUPPLY RETURN
T
RETURN
RETURN
AIR