AGAGC9PNS01B Gas Conversion Kit, Propane to Natural: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
15
The modulating furnace manifold pressure is set at two points. The first
point is Maximum Heat. The second point is Minimum Heat. Do not
adjust Intermediate Heat manifold pressure. Intermediate Heat manifold
pressure can be checked as part of the temperature rise, but is not
adjustable. Always adjust Maximum Heat first, then Minimum Heat.
NOTE:
Use care when performing adjustments. Gas valve adjustment is
performed by turning a rotary adjustment switch inside the gas valve
with a small straight blade screwdriver. Excessive force can break or
bend the rotary adjustment switch making it non-adjustable.
To adjust manifold pressure to obtain input rate for Maximum
Heat:
1. Turn Setup switch SW1-2 to ON.
2. Verify Set-up switch SW4-2 is turned OFF.
3. Jumper the R to W/W1 and W2 thermostat connections at the
furnace control board.
4. After the main burners ignite and the blower starts, confirm
Maximum Heat manifold pressure is correct, based on the manifold
pressure table on the Conversion Kit Rating Plate.
5. To adjust the Maximum Heat manifold pressure, Slowly turn the
rotary adjustment switch counterclockwise to decrease manifold
pressure or clockwise to increase manifold pressure.
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 Temperature 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
. Or, on some models, tighten set screw on manifold tower
pressure tap with a 3/32-in. hex wrench, see
)
12. Re-install plastic cap over rotary adjustment switch on the top of
the gas valve.
A11451
Fig. 25 – Modulating Gas Valve Adjustment
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.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Manifold pressure trap set screw must be tightened or 1/8-in. (3 mm)
NPT pipe plug must be installed to prevent gas leaks.
