W415-1245 / B / 03.19.15
48
IOM
IOM
18.0 AIR
FLOW
18.1 TEMPERATURE RISE CHECK
H12.15.5
TABLE 1 - RANGE OF TEMPERATURE RISE
Furnace Models
Temperature Rise
ALL
35 - 65°F (20 - 36°C)
H22.0
For proper furnace operation, air
fl
ow over the heat exchanger is of utmost importance. Insuf
fi
cient air
fl
ow
accelerates metal fatigue and possible failure in the heat exchanger, as well as decrease ef
fi
ciency. Excessive
air
fl
ow promotes accelerated corrosion of the heat exchanger.
IMPORTANT:
DO NOT BYPASS THIS STEP OF THE
START UP PROCEDURES.
H22.1.1
When the duct system is complete and the air
fi
lter or
fi
lters are in place, determine if the air
fl
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 humidi
fi
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.
X13: ESP 0.1" to 1.0" / PSC: ESP 0.5”
INPUT
A/C
PSC TAP
PSC
CFM
X13
TAP #
X13
CFM
TONNAGE
COLOUR
CSM030S2B
CPX030S2B
HIGH
BLACK
744
5
940
MED-HIGH
BLUE
615
4
750
MED-LOW
YELLOW
573
3
560
LOW
RED
568
*2
N/A
CSM040S2B
CPX040S2B
HIGH
BLACK
744
5
940
MED-HIGH
BLUE
638
4
750
MED-LOW
YELLOW
573
3
560
LOW
RED
534
*2
N/A
CSM060S3B
CPX060S3B
HIGH
BLACK
1075
5
1125
MED-HIGH
BLUE
1034
4
940
MED-LOW
YELLOW
975
3
750
LOW
RED
892
*2
560
CSM080S3B
CPX080S3B
HIGH
BLACK
1300
5
1125
MED-HIGH
BLUE
1214
4
940
MED-LOW
YELLOW
1025
3
750
LOW
RED
795
*2
560
C
SM080S4B
CPX080S4B
HIGH
BLACK
1569
5
1500
MED-HIGH
BLUE
1522
4
1125
MED-LOW
YELLOW
1435
3
750
LOW
RED
1290
*2
700
C
SM100S5B
CPX100S5B
HIGH
BLACK
1836
5
1750
MED-HIGH
BLUE
1779
4
1400
MED-LOW
YELLOW
1595
3
1050
LOW
RED
1355
*2
700
C
SM120S5B
CPX120S5B
HIGH
BLACK
1712
5
1750
MED-HIGH
BLUE
1761
4
1400
MED-LOW
YELLOW
1760
3
1050
LOW
RED
1780
*2
700
* TAP #2 IS CONTINUOUS FAN
TABLE 7 - AIR FLOW
H12.1.9
Summary of Contents for Continental C95 - B SERIES
Page 27: ...W415 1245 B 03 19 15 27 IOM FIGURE 14A DIRECT VENT TERMINAL CLEARANCES...
Page 28: ...W415 1245 B 03 19 15 28 IOM IOM FIGURE 14B NON DIRECT VENT TERMINAL CLEARANCES...
Page 58: ...W415 1245 B 03 19 15 58 IOM IOM 23 0 SERVICE HISTORY 43 1...
Page 74: ...6 0 NOTES 44 1 W415 1245 B 03 19 15 UM 74...
