9
Under normal circumstances it is not necessary or advisable
to change these from their default values.
Heat Off Delay
If the system includes a G6 gas furnace, you may use the
or keys to select HEAT OFF DELAY. Press the key to
enter the screen which allows changes to the length of time
that the blower (indoor fan) will remain on after the furnace
flame is extinguished. Under normal circumstances it is not
necessary or advisable to change this from its default value
of 120 seconds.
Altitude Adjust
If the system includes an iQ modulating gas furnace, you
may use the or keys to select ALTITUDE ADJUST.
Press the key to enter the screen which allows changes to
the installation altitude (feet above sea level). This entry is
advisable for the modulating gas furnace. Refer also to the
furnace Installation Instructions.
Service Tests
You may use the or keys to select SERVICE TESTS.
Press the key to enter the screen which allows access to
a list of service tests. These tests provide an easy way for
the service person to operate the system in various modes
for operational confirmation and diagnostic troubleshooting
during installation startup. The following five options are
available in the submenu.
SERVICE TESTS
CHARGE MODE
AIR COND RUN TESTS
FURNACE TESTS
HEAT PUMP RUN TESTS
DISCRETE OUTPUTS
NOTE: While running the system from Service Tests is
convenient for some startup operations, much of the normal
faulthandlinganddiagnosticmessagefunctionalityisdisabled.
Withineachtestscreentheremaybemorethanoneentrywhich
canbechanged. Selectthedesiredentrytobemodifiedusing
the and keys. The line or value with a dark background
behind the characters is considered “selected”. Press the
key to allow changing the selected item (its dark background
will then blink). Set the desired value for the item using the
and keys, then press the key to save it.
The following is a brief description of the SERVICE TEST
categories.NOTE:WithiQZonesystemstheremaybeadelay
before the test begins, as all zone dampers open.
CHARGE MODE – Runs the system at the proper speed for
checkingandadjustingrefrigerantcharge. Selectthemodeas
HEATING or COOLING, then change RUN from OFF to ON.
The screen backlight will blink red. The user may navigate
to other screens (e.g., SERVICE INFORMATION) during the
process until ON in the CHARGE MODE screen is changed
back to OFF and saved. The red blinking backlight serves as
a reminder that the unit is operating in an abnormal (service)
mode. Select OFF (from the list that includes ON and OFF)
and SAVE ( ) when finished.
FURNACE TESTS – Runs the system at the selected fire
level to allow confirmation of proper operation. The screen
backlight will blink red. A short list of instructions (reminders)
isprovided.SelectSTARTtorunasinglestagefurnace.Select
LOFIRE or HI FIREto runatwostage furnace.Theuser may
navigate to other screens (e.g., SERVICE INFORMATION)
during the process. The red blinking backlight serves as a
reminder that the unit is operating in an abnormal (service)
mode. Select DONE (from the list that includes LO FIRE, HI
FIRE,START,STOP)andSAVE( )whenthetestiscomplete,
before leaving the screen for the last time.
AIR COND RUNTESTS and HEAT PUMP RUN TESTS – In
these screens the unit can be made to run at a fixed speed
regardless of room temperature. RUN can be changed
between OFF, MAX (speed), INTERMED(iate speed), and
MIN (speed). MAX speed is the same as that used in charge
mode. The screen backlight will blink red when anything but
OFF is selected and saved.The user may navigate to other
screens (e.g., SERVICE INFORMATION) during the process
until RUN in this screen is changed back to OFF and saved.
The red blinking backlight serves as a reminder that the unit
is operating in an abnormal (service) mode. This screen is
primarily intended for test agency usage. Heat pump run
tests apply only to heat pump units. Select OFF and SAVE
() when finished.
ForiQheat pumpsthecapabilitytoforceadefrostisavailable.
As indicated on the HEAT PUMP RUN TESTS screen, this
featuremayonlybeusedwhenMAXspeedhasbeenselected.
To perform a sample defrost while a MAX speed heating run
testisrunning,pressthe keytoselectDEFROSTNOW,then
press the ( ) key to begin the defrost.The defrost sequence
will proceed, including use of auxiliary heat while heating the
coilandthe8minutepost-defrostcoiltemperaturecalibration.
Only use this feature if the outdoor conditions are typical
heating conditions.Do not force a defrost before the system
has operated in heating for several minutes first.
DISCRETE OUTPUTS – When the unit is off, this screen
allows the user to operate certain relay-driven outputs in the
system for diagnostic purposes: humidifier (on the indoor
interface board or blower control board), reversing valve (on
the outdoor interface board), indoor coil EXV (on the indoor
interfaceboard orblowercontrolboard),outdoor coilEXV(on
the outdoor interface board), and crankcase heater (on the
outdoor interface board). More than one of these can be set
to ON at the same time. Leaving the DISCRETE OUTPUTS
screen will shut all of the listed outputs off.
