9
The following adjustments and checks are a required part of this conversion. Adjustments and checks include:
• Leak checking orifices
• Verifying proper igniter positioning
• Checking line and adjusting manifold gas pressures
• Verifying proper unit operation (input rate, operational sequence, burner flame, temperature rise, etc.)
Adjustments, Checks, and Tests
Orifice and Igniter Check
WARNING
PERSONAL INJURY HAZARD
To prevent death, personal injury or
property damage due to fire or explosion,
do not use a flame to check for leaks.
1. Leak check burner orifice threads using a soap solu-
tion.
2. Visually inspect the igniter for damage. Replace if
damaged.
Package Gas Electric Units
Verify that the pilot assembly is in the proper place.
3. Reinstall the burner box door (where applicable).
Line Pressure Check
ALL UNITS
CHECK LINE PRESSURE SUPPLIED TO GAS VALVE
1. Turn OFF the power and gas at the manual gas
shutoff valve.
2. Connect a calibrated water manometer or appropriate
gas pressure gauge to the “inlet pressure tap” of the
gas valve or “gas piping drip leg”.
3. Turn ON the power and gas, put the unit into heating
cycle and turn on all other gas consuming appli-
ances.
4. Measure the gas supply pressure with the burners fir-
ing. The inlet gas pressure must be between 11.0
and 13.0 inches W.C. If supply pressure differs from
required, make necessary adjustments to pressure
regulator(s), gas piping, etc.
5. Turn OFF gas to the unit at the manual shutoff valve
and disconnect manometer. Turn OFF any unneces-
sary appliances started in step 3.
Manifold Pressure Check
SINGLE STAGE UNITS
(GUIA/B/C/D, GCIA/B/C, GCD, GDC GUC/D/X,
GCC, GUCA, GCCA, PGA/B/D**C)
A
DJUST GAS MANIFOLD PRESSURE
Set the manifold pressure. The pressure must be
between 9.7 and 10.3 inches W.C. For setting direct
vent (GUD, GCD) furnace manifold pressure, see
“Setting GUD and GCD Manifold Pressure” section at the
end of this manual.
1. Turn OFF gas to the unit at the manual gas shutoff
valve.
2. Connect a calibrated water manometer or appropriate
gas pressure gauge at the gas valve outlet pressure
tap.
3. Turn ON gas supply and operate unit.
4. Remove the cover over the manifold pressure regula-
tor adjustment screw.
5. Adjust manifold pressure: Turn adjustment screw out
(counterclockwise) to decrease pressure. Turn in
(clockwise) to increase pressure.
TWO-STAGE UNITS
(GUIS/V, GCIS, GUVA)
ADJUST GAS MANIFOLD PRESSURE
1. Turn OFF gas to the unit at the manual gas shutoff
valve.
2. Connect a calibrated water manometer or appropriate
gas pressure gauge at the gas valve outlet pressure
tap.
3. Turn ON gas supply and operate unit.
4. Remove the cap screw from the low stage manifold
pressure regulator.
5. Using an Allen wrench, increase low stage manifold
pressure by adjusting the low stage manifold regula-
tor so the furnace will light and carry over.
6. Remove the cap screw from the high stage manifold
pressure regulator adjustment location.
7. Using an Allen wrench, adjust high stage manifold
regulator to the required manifold pressure (Table 2).
8. Reinstall the high stage manifold regulator cap screw.
Confirm high stage manifold pressure.
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