Table of Contents
Advertisement
P
S
RESSURE
WITCHES
The pressure switches are normally-open (closed during opera-
tion) negative air pressure-activated switches. They monitor
the airflow (combustion air and flue products) through the heat
exchanger via pressure taps located on the induced draft blower
and the coil front cover. These switches guard against insuffi-
cient airflow (combustion air and flue products) through the heat
exchanger and/or blocked condensate drain conditions.
F
S
LAME
ENSOR
The flame sensor is a probe mounted to the burner/manifold
assembly which uses the principle of flame rectification to deter-
mine the presence or absence of flame.
T
ROUBLESHOOTING
E
D
LECTROSTATIC
ISCHARGE
NOTE: Discharge body's static electricity before touching unit.
An electrostatic discharge can adversely affect electrical
components.
Use the following precautions during furnace installation and ser-
vicing to protect the integrated control module from damage. By
putting the furnace, the control, and the person at the same
electrostatic potential, these steps will help avoid exposing the
integrated control module to electrostatic discharge. This pro-
cedure is applicable to both installed and uninstalled (ungrounded)
furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body's electrostatic
charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnace away from the control. Any tools held in a person's
hand during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution not
to recharge your body with static electricity; (i.e., do not
move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an
ungrounded object, repeat step 2 before touching control
or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a furnace. Return any old or new
controls to their containers before touching any ungrounded
object.
D
C
IAGNOSTIC
HART
HIGH VOLTAGE !
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
,
ELECTRICAL SHOCK
DISCONNECT ELECTRICAL POWER
BEFORE
PERFORMING ANY SERVICE OR MAINTENANCE
(ESD) P
RECAUTIONS
WARNING
.
Refer to the Troubleshooting Codes for assistance in determin-
ing the source of unit operational problems. The dual 7-segment
LED display will display an error code that may contain a letter
and number. The error code may be used to assist in trouble-
shooting the unit.
R
F
L
ESETTING
ROM
OCKOUT
Furnace lockout results when a furnace is unable to achieve igni-
tion after three attempts during a single call for heat. It is
characterized by a non-functioning furnace and a E 0 code dis-
played on the dual 7-segment display. If the furnace is in "lock-
out", it will (or can be) reset in any of the following ways.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to
the furnace.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat for 1 -20 seconds then
reset to previous setting.
NOTE: If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to the
Troubleshooting Codes for aid in determining the cause.
M
AINTENANCE
T
O AVOID ELECTRICAL SHOCK
DISCONNECT ELECTRICAL POWER BEFORE PERFORMING ANY
. I
MAINTENANCE
F YOU MUST HANDLE THE IGNITER
. T
HANDLE WITH CARE
OUCHING THE IGNITER ELEMENT
,
WITH BARE FINGERS
ROUGH HANDLING OR VIBRATION
COULD DAMAGE THE IGNITER RESULTING IN PREMATURE
. O
FAILURE
NLY A QUALIFIED SERVICER SHOULD EVER
.
HANDLE THE IGNITER
A
I
NNUAL
NSPECTION
The furnace should be inspected by a qualified installer, or ser-
vice agency at least once per year. This check should be per-
formed at the beginning of the heating season. This will ensure
that all furnace components are in proper working order and that
the heating system functions appropriately. Pay particular atten-
tion to the following items. Repair or service as necessary.
•
Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections at
and internal to the furnace.
•
Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
•
Burners. Check for proper ignition, burner flame, and
flame signal.
•
Drainage system. Check for blockage and/or leakage.
Check hose connections at and internal to furnace.
•
Wiring. Check electrical connections for tightness and/
or corrosion. Check wires for damage.
•
Filters.
46
WARNING
,
,
INJURY OR DEATH
,
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
