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10 seconds). Once communications with User Interface are
successful, COMM LED will be lit and held on. At the same time,
amber STATUS LED will be lit and held continuously on until a
request for operating mode is received. The STATUS LED will be
on any time unit is in idle mode.
If, at any time, communications are not successful for a period
exceeding 2minutes,theInfinity controlwillonlyallowemergency
heatingorcooling operationusingacommonthermostatandtheR,
C, Y,O, W terminalstrip connectionsand will display StatusCode
16, System Communication Fault, on amber STATUS LED. No
further troubleshooting information will be available at User
Interfaceuntil communications are re--established.
IfCOMM LEDdoesnot light within propertimeperiod andstatus
code is not displayed;
1. Checksystemtransformerhigh -- andlow-- voltageto besure
the system is powered.
2. Checkfuseoncontrolboardtobesureitisnotblown.Iffuse
isopen,check systemwiring before replacingit to besurea
short does not cause a failure of replacement fuse.
IfCOMM LEDdoesnot light within propertimeperiod andstatus
code is displayed,
1. Check system wiring to be sure User Interface is powered
andconnections are made A to A, B to B, etc.and wiring is
not shorted. Mis--wiring or shorting of the ABCD
communications wiring will not allow successful
communications.
NOTE:Shortingormis--wiringlow-- voltagesystemwiringwillnot
cause damage to unit control or user interface but may cause low
voltage fuseto open.
C. ECM Motor Troubleshooting
The ECM motor used in this product consists of two parts: the
control module and the motor winding section. Do not assume
motorormoduleisdefectiveifitwillnotstart.Usethedesigned--in
LED information aids and follow troubleshooting steps described
below before replacing motor control module or entire motor.
Motor control module is availableas a replacement part.
VERIFY MOTOR WINDING SECTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Afterdisconnectingpowerfrom theECM motor,wait atleast
5 minutes before removing the control section. Internal
capacitors require time to discharge.
!
WARNING
Before proceeding to replace a motor control module:
1. Check motor winding section to be sure it is functional.
2. Removemotorcontrol modulesectionand unplug winding
plug.Motorshaftshouldturn freely,resistance between any
two motor leads should be similar and resistance between
any motor lead and unpainted motor end should exceed
100,000 ohms.
3. Failing any of these tests, entire ECM motor must be
replaced.
4. Passing all of the tests, motor control module alone can be
replaced.
MOTOR TURNS SLOWLY
1. Low static pressure loading of blower while access panel is
removed will causeblowerto run slowly.Particularly atlow
airflowrequests.Thisisnormal,donotassumeafaultexists.
2. Recheck airflow and system static pressure using User
Interface service screens with access panel in place.
NOTE: Blower motor faults will not cause a lockout of blower
operation.The unit control willattempt to run the blower motoras
long as User Interface maintains a demand for airflow. The unit
control will not operate electric heaters while a fault condition
exists. Theunit control communicates with the motorat leastonce
everyfiveseconds,evenwhenthemotorisidle.If,duringoperation,
theunitcontroldoesnotcommunicatewiththemotorformorethan
25 seconds, the motor will shut itself down and wait for
communications to be reestablished.
D. Using Motor LED in Troubleshooting
The MOTOR LED is connected to the blower motor
communicationlineandworkswiththeunitcontrolmicroprocessor
and the STATUS LED to provide unit operation and
troubleshooting information. When the motor is commanded to
operate,theMOTORLEDwillbeturned onand willflash eachtime
instructionsaresenttothemotor.Whenthemotoriscommandedto
stop, the MOTOR LED will be turned off.
If the MOTOR LED is lit, flashing, and the motor is running, or if
the MOTOR LED is off and the motor is stopped, operation is
normal and no motor fault exists.
If the MOTOR LED is lit, flashing, and the motor does not run, or
if the MOTOR LED is off and the motor is running, check the
STATUS LED for the Status Code. Refer to the troubleshooting
instructions for the indicated Status Code in Section E, Unit
Troubleshooting.
E. Unit Troubleshooting
Unit faults indicated by flashing codes on the amber system
STATUS LED can be resolved using troubleshooting information
provided below. Codes are listed in order of their priority, highest
to lowest. Though multiple faults can exist at any time, only the
highestpriority code willbe displayed on STATUS LED.Clearing
the i ndicated fault when multiple faults exist will cause the next
highestpriorityStatusCodetobeflashed.Allexistingfaults,aswell
as a fault history, can be viewed at User Interface.
STATUS CODE 45, CONTROL BOARD TEST FAULT
Unit control has failed internal start--up tests and must be replaced.
No other service procedure will correct.
STATUS CODE 37, HEATER OUTPUT SENSED “ON”WHEN
NOT ENERGIZED:
Unitcontrolisprovidedwithcircuitrytodetectpresenceofa24--vac
signal on electric heater stage 1 and stage 2 outputs.
If unit controldetects a24 --vac signalon eitherheater stageoutput
and it is not supplying signal, StatusCode 37 will be displayed on
STATUS LED. Unit control will turn off output and command
blowermotortosupplyanairflowdeterminedtobesafeforcurrent
operation mode with electric heaters energized.
To find the fault:
1. Stop allsystemoperationsatUser Interfaceandcheckheater
stage 24 -- vac outputs.
2. Disconnect electric heater at power and check heater wiring
for faults. See Status Code 36 for more information.
STATUS CODE 44 , MOTOR COMMUNICATION FAULT
The MOTOR LED is connected to the blower motor
communicationlineandworkswiththeunitcontrolmicroprocessor
and STATUS LED to provide unit operation and troubleshooting
information.
When motor is commanded to operate, the MOTOR LED will be
turned on and will flash eachtimeinstructionsare senttothemotor.
50CR