Goodman ACS series Service Instructions Manual page 94

MAINTENANCE
CONDENSATE DRAINAGE SYSTEM (QUALIFIED
SERVICER ONLY)
The drain tubes, standpipe, and field supplied drain line must
be checked annually and cleaned as often as necessary to
ensure proper condensate drainage.
FLUE PASSAGES (QUALIFIED SERVICER ONLY)
At the start of each heating season, inspect and, if neces-
sary, clean the furnace flue passages.
CLEANING FLUE PASSAGES (QUALIFIED SERVICER
ONLY)
1. Turn OFF the electrical power and gas supply to the
furnace.
2. Disconnect the gas line and remove the burner/ mani-
fold assembly by removing the screws securing the as-
sembly to the partition panel.
3. Disconnect the flue pipe system from the induced draft
blower.
4. Remove the induced draft blower and, drain and pres-
sure tap hoses from the recuperator coil front cover.
5. Remove the recuperator coil front cover to expose the
coil tubes and turbulators.
6. Remove the recuperator coil turbulators individually by
slowly pulling each turbulator forward firmly.
7. Clean the recuperator coil tubes using a long handle
wire brush, such as a gun cleaning brush.
8. Clean the primary heat exchanger tubes using a wire
brush attached to a length of high grade stainless steel
cable, such as drain cleanout cable. Attach a variable
speed reversible drill to the other end of the cable. Slowly
rotate the cable with the drill and insert it into one of the
heat exchanger tubes. While reversing the drill, work
the cable in and out several times to obtain sufficient
cleaning. Repeat for each tube.
9. Clean residue from furnace using a vacuum cleaner.
10. Replace the parts removed in the previous steps in re-
verse order.
11. Turn on electrical power and gas to furnace. Check for
leaks and proper unit operation.
12. Severe heat exchanger fouling is an indication of an op-
erational problem. Perform the steps listed in the Sys-
tem Operation section of this manual to reduce the
chances of repeated fouling.
FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating
acts as an insulator, causing a drop in the flame sensing
signal. If this occurs, a qualified servicer must carefully clean
the flame sensor with steel wool. After cleaning, the flame
sensor output should be as listed on the specification sheet.
94
BURNERS
HIGH VOLTAGE
E
LECTRICAL COMPONENTS ARE CONTAINED IN BOTH
T
COMPARTMENTS. O AVOID ELECTRICAL SHOCK, INJURY OR
DEATH, DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS
OR ATTEMPT ANY ADJUSTMENT.
SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME
APPEARANCE SHOULD DEVELOP.
Periodically during the heating season make a visual check
of the burner flames. Turn the furnace on at the thermostat.
Wait a few minutes since any dislodged dust will alter the
normal flame appearance. Flames should be stable, quiet,
soft and blue with slightly orange tips. They should not be
yellow. They should extend directly outward from the burner
ports without curling downward, floating or lifting off the ports.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
Burner Flame
TEST EQUIPMENT
Proper test equipment for accurate diagnosis is as essen-
tial as regular hand tools.
The following is a must for every service technician and ser-
vice shop.
1. Dial type thermometers or thermocouple meter (optional)
- to measure dry bulb temperature.
2. Amprobe - to measure amperage and voltage.
3. Volt-Ohm Meter - testing continuity, capacitors, and mo-
tor windings.
4. Inclined Manometer - to measure static pressure, pres-
sure drop across coils, filters, and draft.
5. Water Manometer (12") - to test gas inlet and manifold
pressure.
Other recording type instruments can be essential in solv-
ing abnormal problems, however, in many instances they
may be rented from local sources.
Proper equipment promotes faster, more efficient service and
accurate repairs resulting in fewer call backs.
WARNING
C
ONTACT A QUALIFIED