Gas Input Rate Measurement (Natural Gas Only); Temperature Rise - Amana MVM97 Installation Instructions Manual

Manifold Gas Pressure
Gas
Natural High Stage
Propane High Stage
Gas Input Rate Measurement (Natural Gas
Only)
The actual gas input rate to the furnace must never be
greater than that specified on the unit rating plate. To
measure natural gas input using the gas meter, use the
following procedure.
1. Turn OFF the gas supply to all other gas-burning appli-
ances except the furnace.
2. While the furnace is operating at high fire rate, time
and record one complete revolution of the gas meter
dial measuring the smallest quantity, usually the dial
that indicates 1/2 cu. ft. per revolution. You will use
this number to calculate the quantity of gas in cubic
ft. if the furnace would consume if it ran steadily for
one hour (3600 seconds).
3. If the 1/2 cu. ft. dial was used, multiply your number
x 2.
EXAMPLE: If it took 23 seconds to complete one revolution
of the 1/2 ft. dial.
This tells us that at this rate, it would take 46 seconds to
consume one cu. ft. of gas. 23 x 2 = seonds per cu. ft.
3600 (secs in 1 hour) / 46 = 78
This tells us that in one hour, the furnace would consume
78 cu. ft. of gas.
The typical caloric range for 1 cu. ft. of natural gas is
around 1000 BTU. Check with your gas utility, if possible.
In this example, the furnace is consuming 78,000 BTUH.
NOTE: The final manifold pressure cannot vary by more
than ± 0.3" w.c. for Natural and + 0.5" for LP from the
specified setting. Consult your local gas supplier if addi-
tional input rate adjustment is required.
4. Turn ON gas to and relight all other appliances turned
off in step 1. Be certain that all appliances are func-
tioning properly and that all pilot burners are operat-
ing.

Temperature Rise

Temperature rise must be within the range specified on
the unit rating plate. An incorrect temperature rise may
result in condensing in or overheating of the heat ex-
changer. An airflow and temperature rise table is provid-
ed in the Specification Sheet applicable to your model.
Range Nom inal
3.2 - 3.8" w .c. 3.5" w .c.
9.5 - 10.5" w .c. 10.0" w .c.
Determine and adjust temperature rise as follows:
1. Operate furnace with burners firing for approximate-
ly 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 circula-
tor blower speed. Increase blower speed to reduce
temperature rise. Decrease blower speed to increase
temperature rise. Refer to Startup Procedure and Ad-
justment -Circulator Blower Speeds for speed chang-
ing details.
TEMPERATURE RISE
Model
*MVM970603BNAA
*MVM970803BNAA
*MVM970804CNAA
*MVM971005CNAA
*MVM971205DNAA
*CVM970603BNAA
*CVM970803BNAA
*CVM970804CNAA
*CVM971005CNAA
Temperature Rise Measurement
HI / LO
20-50/25-55
30-60/25-55
25-55/25-55
35-65/25-55
35-65/30-60
35-65/30-60
35-65/35-65
35-65/35-65
35-65/30-60
SUPPLY
AIR
RETURN
AIR
Figure 52