Air Flow; Temperature Rise Check - Napoleon 9500 series Installation And Operating Instructions Manual

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18.0

AIR FLOW

For proper furnace operation, air fl ow over the heat exchanger is of utmost importance. Insuffi cient airfl ow
IOM
IOM
accelerates metal fatigue and possible failure in the heat exchanger, as well as decrease effi ciency. Excessive
airfl ow promotes accelerated corrosion of the heat exchanger.
IMPORTANT:
DO NOT BYPASS THIS STEP OF THE
START UP PROCEDURES.

18.1 TEMPERATURE RISE CHECK

When the duct system is complete and the air fi lter or fi lters are in place, determine if the airfl ow is correct.
1. Insert a duct thermometer in the supply air duct. The thermometer should be placed as close as practical
to the furnace, but out of the "line of sight" of the heat exchanger (this prevents false readings owing to
radiant heat). Ensure that the thermometer location is within the duct air stream. Avoid locations such as
the inside radius of an elbow, etc.
2. Insert a duct thermometer in the return air duct as close to the furnace as practical. Ensure that the
thermometer location will be unaffected by humidifi er bypass ducts, etc. Choose a location well within the
main air stream.
3. Operate the furnace long enough to obtain steady state conditions at the input listed on the furnace rating plate.
4. When the two thermometers have stabilized, usually within 5-8 minutes, compare the two readings.
Subtract the return air temperature from the supply air temperature. The difference is the temperature rise,
also called ∆T.
5. Compare the measured ∆T to the temperature rise range shown on the rating plate.
Unless stated differently on the rating
plate, the temperature rise should
normally range between 35° to
65°F (20° to 36°C). When adjusting
the temperature rise, the ideal
temperature rise is approximately
50°F (28°C).
If the measured ∆T is above the
approved temperature range,
there is too little air fl ow. It must be
increased by removing restrictions
in the ductwork, adding supply or
return ductwork, or by selecting a
higher motor speed.
If the measured ∆T is too low, there
is too much air fl ow.
W415-0973 / B / 08.28.13
H22.0
TABLE 7A - AIR FLOW (PSC)
PSC ESP 0.1" to 1.0" w.c.
MAX A/C TAP
Input
Tonnage COLOUR
BLACK
BLUE
45000 2.5 TON
YELLOW
RED
BLACK
BLUE
60000 3 TON
YELLOW
RED
BLACK
BLUE
80000 3 TON
YELLOW
RED
BLACK
BLUE
100000 5 TON
H22.1.1
YELLOW
RED
BLACK
BLUE
120000 5 TON
YELLOW
RED
NOTE
Airfl ow based on approximately 375 CFM/Ton.
TABLE 1 - RANGE OF TEMPERATURE RISE
Furnace Models Temperature Rise
ALL 35 - 65°F (20 - 36°C)
TABLEAU 1 - ÉTENDUE DES ÉLÉVATIONS DE
TABLE 7B - AIR FLOW (ECM X13)
X13
Max A/C
CFM Input
Tonnage
1200
1125
45000 2½ TON
975
800
1200
1125
60000 3 TON
975
800
1500
1300
80000 3 TON
1000
800
2100
2000
100000 5 TON
1700
1300
2100
2000
120000 5 TON
1700
1300
H12.1.3
H12.15.5
ESP 0.1" to 1.0" w.c.
TAP
CFM
NUMBER
5 940
4 750
3 560
2 N/A
5 1125
4 940
3 750
2 560
5 1125
4 940
3 750
2 560
5 1750
4 1400
3 1050
2 700
5 1750
4 1400
3 1050
2 700