Intertek ACVC96 Service Instructions Manual page 56

SYSTEM OPERATION
TROUBLESHOOTING
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
servicing to protect the integrated control module from dam-
age. 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 dis-
charge. This procedure 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 electro-
static 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 cau-
tion not to recharge your body with static electricity;
(i.e., do not move or shuffle your feet, do not touch un-
grounded 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.
F W M T
OUR IRE OTOR ROUBLESHOOTING
Any manual testing of the 4 wire seriallY communicating
motor should only be done with the ULTRACHECK-EZ diag-
nostic tool (part # UTT-01). All other methods may not be
reliable or cause damage to the 4 wire motor. See section
S-16C for additional details.
C N S T
OMFORT ET YSTEM ROUBLESHOOTING
At system power-up, the CTK0*** thermostat will begin
searching for any connected compatible equipment. The
thermostat will scroll "SEARCHING". The thermostat will
scroll <equipment> FOUND once it indentifies that piece
of equipment. In a typical installation, an indoor unit and
outdoor unit will be identified.
If the thermostat scrolls "SEARCHING" for several minutes,
then it has failed to identify any connected equipment. The
thermostat may identify one piece of equipment, but not the
other. Broken or improper wiring is the most likely cause for
the thermostat to fail to identify any equipment. If an out-
door unit is not identified, the thermostat will scroll "CHECK
SYSTEM", indicating that no indoor unit was found.
56
(ESD) P
RECAUTIONS
ComfortNet™ System
Wiring issues may be confirmed (or eliminated) by using
the CTK0*** thermostat and sub base, a 4-position connec-
tor (included with the kit), and a short section (~ 2ft) of ther-
mostat wire. Connect the wire between the connector and
thermostat sub base. Connect the thermostat to the indoor
unit and apply power. If the thermostat identifies the indoor
unit, then a wiring problem exists between the indoor unit
and the permanent thermostat location. Repair or replace
wiring.
Connect the thermostat to the outdoor unit. If the thermo-
stat identifies the outdoor unit, then a wiring problem exists
between the indoor and outdoor units. Repair or replace
wiring.
NOTE: A 24VAC source will be needed to power the ther-
mostat and outdoor unit control.
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
Refer to the Troubleshooting Chart in the Appendix for as-
sistance in determining the source of unit operational prob-
lems. 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 troubleshooting the unit.
RESETTING FROM LOCKOUT
Furnace lockout results when a furnace is unable to achieve
ignition after three attempts during a single call for heat. It
is characterized by a non-functioning furnace and a E 0
code displayed on the dual 7-segment display. If the fur-
nace is in "lockout", 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
Diagnostic Chart for aid in determining the cause.
WARNING
.