Goodman ACVC8 CA Series AMVC8 CA Series Service And Troubleshooting page 20

SYSTEM OPERATION
NOTE: If using the inlet pressure tap on the
White-Rodgers 36J54 gas valve, then use the 36G/J
Valve Pressure Check Kit, Part No. 0151K00000S.
3. Turn ON the gas supply and operate the furnace and
all other gas consuming appliances on the same gas
supply line.
4. Measure furnace gas supply pressure with burners firing.
Supply pressure must be within the range specified in
the Inlet Gas Supply Pressure table.
If supply pressure differs from table, make the necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve and
disconnect manometer. Reinstall plug before turning on
gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in
step 3.
Gas Manifold Pressure Measurement and
Adjustment
To prevent unreliable operation or equipment
damage, the gas manifold pressure must be as
specified on the unit rating plate. Only minor
adjustments should be made by adjusting the
gas valve pressure regulator.
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
pressure must be measured with the burners operating.
To measure and adjust the manifold pressure, use the
following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
3. O u t l e t p r e s s u r e
White-Rodgers 36J54 valve: Back outlet pressure
test screw (inlet/outlet pressure tap) out one turn
(counterclockwise, not more than one turn).
4. Attach a hose and manometer to outlet pressure tap .
5. Turn ON the gas supply.
Follow this procedure to test the gas valve pressure at
100% firing rate.
Run High Fire
It is recommended that the CoolCloud phone application
be used for all functional tests. If a manual test is preferred
there are two methods available.
20
CAUTION
t a p c o n n e c t i o n s :
Method 1 (Temporary Test):
1. Using the on board push button switches, enter the
Gas Pressure Test menu (7 segment display "gPt")
and select YES to enable the Gas Pressure Test. The
system will operate in high fire for 5 minutes or until the
test is terminated by pressing any of the 3 on board push
button switches.
Method 2 (Longer Term Test):
1. Turn off the furnace
2. If installing a communicating fossil fuel system, make
sure the 1,2,R,C terminal is either removed or there are
no wires connected. If utilizing an accessory module to
control a non-communicating heat pump, disconnect the
RJ12 jack from the furnace.
3. Provide power to the furnace
4. Provide a thermostat W call. The system will continuously
run at 100% firing rate.
5. When test is complete, remove the W (heat) call to the
furnace. The system will shut down.
Run Low Fire
1. Turn off the furnace
2. If installing a communicating fossil fuel system, make
sure the 1,2,R,C terminal is either removed or there are
no wires connected. If utilizing an accessory module
to control a non-communicating heat pump, disconnect
the RJ12 jack from the furnace.
3. Provide power to the furnace
4. Provide a thermostat W call and allow furnace to begin
its ignition sequence
5. Remove thermostat W call and allow furnace to enter
idol state (7 segment display IdL)
6. Provide the thermostat W call again. The furnace will
now operate in low stage for greater than 5 minutes
(assuming the target runtime has been set to something
greater than 10 minutes).
7. When test is complete, remove the W (heat) call to the
furnace. The system will shut down.