Carrier 59SU5A Manual page 55

59SU5A: Installation, Start-up, Operating and Service Maintenance Instructions
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 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: 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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
!
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.
!
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 furnace 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.
6. Carefully remove burner insulation assembly, Insulation MUST be
replaced before reassembly.
7. Clean heat exchanger openings with a vacuum and a soft brush (see
Fig. 67).
Representative drawing only, some models may vary in appearance.
Fig. 67 – Cleaning Heat Exchanger Cell
NOTE: After cleaning, inspect the heat exchangers to ensure they are
free of all foreign objects that may restrict flow of combustion products.
8. Reverse items 6 through 1 for reassembly. Torque burner screws to
45 inch-pound to ensure a tight burner seal.
9. Refer to furnace wiring diagram and reconnect wires to burner
thermal switch, gas valve, igniter, and flame sensor.
10. Turn on gas and electrical supplies to furnace.
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WARNING
WARNING
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