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Example (kW)
Number of
Number of
seconds per
seconds per
complete
hour
rotation
3,600
80
3,600 ÷ 80 x .05 = 7.2 m
3
2.25m
/h x 10.35 kWh/m
23.28 x 3.412 = 79,431 BTU
4.
Remove jumper wire from R to W1 and W2.
5.
Relight all appliances and ensure all pilots are operating.
Main Burner Flame Check
Allow the furnace to run approximately 10 minutes then inspect the
main burner and pilot flames. See Figure 46.
Check for the following (Figure 46):
• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yellow
tips.
• Flames extending directly from burner into heat
exchanger.
• Flames do NOT touch sides of heat exchanger
If any problems with main burner flames are noted, it may be
necessary to adjust gas pressures, or check for drafts.
Figure 46
Main Burner
NOTE: For Ignitor location see Figure 47.
Figure 47
Ignitor Location in(mm)
1/
2
(52.4)
16
5
/
(8)
16
NOTE:
Flame sensor has a different orientation in all 040 & 050 models.
Temperature Rise Check
The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate for both High
Heat and Low Heat operation. Temperature rise is the difference
between supply and return air temperatures.
To check temperature rise,use the following procedure:
1.
Place thermometers in supply and return air registers as
close to furnace as possible, avoiding direct radiant heat
from heat exchangers.
44
Size of test dial
kW m
3
(.05m
)
.05
2.25
3
/h
3
= 23.28 kW
.
Burner Face
10−10−78
1
/
(6.4)
4
Specifications are subject to change without notice.
2.
Operate furnace on High Heat for 10 minutes with all the
registers and duct dampers open by using a jumper wire on
R to W1 and W2 thermostat connections on the furnace
3
/h
control board.
Note: The SW1 DIP switch #3 should be in the on position.
(See furnace wiring diagram)
3.
Take readings and compare with range specified on rating
plate.
4.
If the temperature rise is not in the correct range, the blower
speed must be changed. A higher blower speed will lower
the temperature rise. A lower blower speed will increase the
temperature rise.
5.
Repeat steps 2 thru 4 with the furnace operating on Low
Heat for 10 minutes by using a jumper wire on the R to W1
thermostat connections on the furnace control board.
6.
Remove the jumper wire after the adjustments are
complete. Return SW1 DIP switch #3 to previous setting.
Blower Adjustments (*9MPT)
Changing Blower Speed
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in
personal injury or death.
Turn OFF power, lockout, and tag switch with a
suitable warning label, to furnace before
changing speed taps.
NOTE: The speed taps that the manufacturer sets from the factory
for this product are based on a nominal 400 CFM (189 L/s) per ton
cooling and the basic mid range on the temperature rise for
heating.
Since the manufacturer cannot establish the static pressure
that will be applied to the unit, it is the responsibility of the
installer dealer/contractor to select the proper speed taps for
the application when the unit is installed.
If it is necessary to change speeds, refer to steps below.
CAUTION
!
REDUCED FURNACE LIFE HAZARD
Failure to follow this caution may result in reduced
furnace life.
Use ONLY the blower motor speed taps insert
indicated in the Circulation Air Blower Data for
setting air temperature rise.
1.
Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the furnace control board
as well as location of unused blower motor speed leads.
Use the chart (Table 12) to determine the blower motor
speed settings.
Table 12
Wire Color
Black
Orange*
Blue
Red
* Med−High speed may not be provided on all models.
WARNING
Blower Speed Chart
Motor Speed
High
Med−High
Medium
Low
440 01 2024 04
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