International comfort products A Series Installation Instructions Manual page 57

8. Turn on gas and electrical supplies to furnace.
9. Verify igniter operation by initiating control board self- -test
feature. Run the furnace through two complete heating cy-
cles to check for proper operation.
10. Replace control door.
Flushing Collector Box and Drainage System
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Turn off the gas and electrical supplies to the furnace and
install lockout tag before performing any maintenance or
service. Follow the operating instructions on the label
attached to the furnace.
1. Turn off gas and electrical supplies to furnace.
2. Remove control door.
3. Disconnect pressure transducer tube from pressure
transducer port.
NOTE:
Ensure the pressure transducer tube disconnected from the
pressure transducer is higher than the collector box opening or
water will flow out of tube.
4. Remove the collector box plug from the top port on the
upper corner of the collector box (Fig. 59).
5. Attach a funnel with a flexible tube to port on the collector
box.
6. Flush inside of collector box with water until discharge
water from condensate trap is clean and runs freely.
7. Repeat steps 4 thru 6 with middle plug on upper corner of
collector box.
8. Remove the pressure transducer
NOTE: Do NOT blow into tube with tube connected to the
pressure transducer.
9. Clean pressure transducer port on collect box with a small
wire. Shake any water out of pressure transducer tube.
10. Reconnect tube to pressure transducer and pressure trans-
ducer port.
11. Remove the relief tube from the port on the collector box
and the trap.
12. Clean the relief port on collector box and the trap with a
small wire. Shake any water out of the tube.
13. Reconnect relief tube to trap and collector box ports.
Cleaning Condensate Drain and Trap
NOTE: If the condensate trap is removed, a new gasket between
the trap and collector box is required. Verify a condensate trap
gasket is included in the service kit or obtain one from your local
distributor.
1. Reverse installation instructions found in Condensate Trap
Section to disassemble the condensate trap.
2. Use water or a slight brush to clean components. Do NOT
cut into glued PVC sections to service the trap.
3. Ensure all instructions, cautions, and warning from
Condensate Trap Section are followed when reassembling
condensate trap.
Checking Heat Tape Operation (If Applicable)
In applications where the ambient temperature around the furnace
is 32_F or lower, freeze protection measures are required. If this
application is one where heat tape has been applied, check to
ensure it will operate when low temperatures are present.
NOTE: The Heat Tape, when used, should be wrapped around the
condensate drain trap. There is no need to use heat tape within the
furnace casing. Most heat tapes are temperature activated, and it is
440 01 4601 01
tube from the collector box.
Specifications subject to change without notice.
not practical to verify the actual heating of the tape. Check the
following:
1. Check for signs of physical damage to heat tape such as
nicks, cuts, abrasions, gnawing by animals, etc.
2. Check for discolored heat tape insulation. If any damage or
discolored insulation is evident, replace heat tape.
3. Check that heat tape power supply circuit is on.
Cleaning Heat Exchangers
The following items must be performed by a qualified service
technician.
Primary Heat Exchangers
IMPORTANT: It is not recommended to clean the heat exchanger
as part of annual maintenance.
If there is reason to believe that primary heat exchanger is
obstructed and cleaning is needed, remove burner assembly to
access heat exchanger and follow steps below.
Once burner assembly is removed, gasket of the burner box MUST
be replaced with a new gasket.
NOTE: If the heat exchangers get a heavy accumulation of soot
and carbon, both the primary and secondary heat exchangers
should be replaced rather than trying to clean them thoroughly due
to their intricate design. A build- -up of soot and carbon indicates
that a problem exists which needs to be corrected, such as improper
adjustment of manifold pressure, insufficient or poor quality
combustion air, improper vent termination, incorrect size or
damaged manifold orifice(s), improper gas, or a restricted heat
exchanger (primary or secondary). Action must be taken to correct
the problem.
NOTE: Proper use of Personal Protective Equipment (PPE) must
be followed, including safety glasses, gloves, and dust mask when
removing and reinstalling the heat exchanger insulation assembly.
1. Turn off gas and electrical supplies to furnace.
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
injury or death, or property damage.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than one
disconnect switch. Lock out and tag switch with a suitable
warning label. Verify proper operation after servicing.
Always reinstall access doors after completing service and
maintenance.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Turn off the gas and electrical supplies to the furnace and
install lockout tag before performing any maintenance or
service. Follow the operating instructions on the label
attached to the furnace.
2. Remove control door.
3. Disconnect wires or connectors to burner thermal switch,
gas valve, igniter, and flame sensor.
4. Using backup wrench, disconnect gas supply pipe from fur-
nace gas control valve.
5. Remove screws attaching burner assembly to cell panel.
NOTE: Burner, manifold, gas valve, and orifice should be
removed as one assembly.
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