Natural Gas to Propane Conversion Instructions

AG--KC019SNP--02 17
Specifications subject to change wi thout notice.
6. Turn rotary adjustment switch no more than one click per
second until you obtain the required manifold pressure.
Main burner flame should be clear blue, almost transparent.
To adjust manifold pressure to obtain input rate for
Minimum Heat:
1. Remove the jumper from W2 at the thermostat
connections at the furnace control board control.
2. Wait until the burners and the blower transitions to
Minimum Heat.
3. Verify the Minimum Heat manifold pressure is correct,
based on the manifold pressure table on Conversion Kit
Rating Plate.
4. To adjust the Minimum Heat manifold pressure, Slowly
turn the rotary adjustment switch counterclockwise to
decrease manifold pressure or clockwise to increase
manifold pressure.
5. Turn rotary adjustment switch no more than one click per
second until you obtain the required manifold pressure.
This adjustment will not affect the previous Maximum
Heat adjustment.
After adjusting the manifold pressure, allow the furnace to
operate an additional 5 minutes before checking Minimum Heat
Temperature rise.
Furnace must operate within ranges of temperature rise
specified on the furnace rating plate. Determine air temperature
rise as follows:
1. Place thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not see
heat exchanger so that radiant heat does not affect
readings. This practice is particularly important with
straight-run ducts.
2. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine air
temperature rise.
3. Allow the furnace to run for at least 10 minutes before
checking Temperature Rise.
If the temperature rise is too high or too low in Minimum Heat:
1. Remove jumpers from R and W/W1.
2. Wait until the blower off delay is completed.
3. Turn 115 VAC power off.
4. Check the position of Heat Rise Adjustment Switch
SW1-3. When set to ON, airflow is raised 18% higher for
Minimum Heat and Intermediate Heat. Factory default
position is OFF.
5. Turn 115 VAC power on.
6. Jumper R to W/W1 and W2.
7. After burners ignite and blower starts allow the furnace to
run for at least 10 minutes before checking Temperature
Rise.
Maximum Heat Temperature Rise
If the temperature rise is too high or too low in Maximum Heat:
1. Remove jumpers from R, W1 and W2.
2. Wait until the blower off delay is completed.
3. Turn 115 VAC power off.
4. Check the position of the Efficiency/Comfort Adjustment
switch SW1-4. When set to OFF (Efficiency Mode), airflow
is 10% higher for Minimum, 7.5% for Intermediate Heat,
and 17.5% for Maximum Heat. Factory default position is
ON (Comfort Mode).
5. Turn 115 VAC power on.
6. Re-check Minimum Heat Te mperature Rise.
7. Remove jumpers across thermostat connections to
terminate the call for heat. Wait until the blower off delay is
completed.
8. Turn gas supply manual shutoff valve to OFF position.
9. Turn off furnace power supply. Turn setup switch SW1 --2
to OFF.
10. Remove manometer from the manifold pressure tap of the
gas valve.
11. On some models, apply pipe dope sparingly to end of
1/8--in. (3 mm) pipe plug and install in the manifold
pressure tap opening (see Figure 14). Or, on some
models, tighten set screw on manifold tower pressure tap
with a 3/32--in. hex wrench. (See Figure 23)
Figure 23
Modulating Gas Valve Adjustment
A11451
12. Re-install plastic cap over rotary adjustment switch on the
top of the gas valve.
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Manifold pressure tap set screw must be tightened or
1/8--in. (3 mm) NPT pipe plug must be installed to prevent
gas leaks.
!
WARNING
13. Turn furnace gas valve switch to ON position.
14. Turn on furnace power supply.
15. Set room thermostat to call for heat.
16. Check pressure tap plug for gas leaks when main burners
ignite.
17. Check for correct burner flame.
CHECK LOW GAS PRESSURE
SWITCH
The newly installed low gas pressure switch is a safety device
used to guard against adverse burner operating characteristics
that can result from low gas supply pressure. Switch opens at
not less than 7.2 in. w.c. and closes at not greater than 10.2 in.
w.c.
This switch also prevents operation when the propane tank level
is low which can result in gas with a high concentration of
impurities, additives, and residues that have settled to the
bottom of the tank. Operation under these conditions can cause
harm to the heat exchanger system. This normally open switch
closes when gas is supplied to gas valve under normal
operating pressure.