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When
paired
with a communicating
outdoor
unit,
the
Air Handler
control board will auto-discover
the outdoor
unit
size. Default
settings
are
400 cfm/ton
and
1.5
minute
at 100% cfm off delay. For other
airflow set-
tings, access the User Interface
Menu (See Figure
18)
to select options
or use the options in the communicat-
ing Comfort
Control.
The full menu is listed in Figure
19.
When
Air Handler
is to be used
in 24V mode,
ac-
tess
the User Interface
to change
the comfort
con-
trol
mode
to 24V, match
the
airflow
for the
out-
door
unit
size
(tons),
adjust
the
cooling
airflow
(cfrniton),
set
the
Fan
on!off-delay
options,
and
adjust
the
heating
airflow
per
the
Nameplate
specifications
on the air handler
front
panel.
The
User Interface
appears
as shown in Figure
18. The full
menu is listed in Figure
20.
If the airflow needs
to be increased
or decreased,
see
the Blower Performance
Table in the Service Facts.
In-
formation
on changing
the speed of the blower motor
for your specific
outdoor
model
size is in the Blower
Performance
Table.
Be sure
to set the
airflow
for the
correct
tonnage.
Refer to the User Interface
for correct setting.
If the optional
humidistat
is used, remove R-BK jumper
from the low voltage
terminal
board (not shown) and in-
stall the humidistat
between R and BK. (Jumper
R to O
for cooling-only/non-heat
pump systems
with a humidis-
tat.)
K. UNIT TEST MODE
Unit Test Mode (Air Handler)
The system
must
be idle or thermostat
switched
to
"OFF" before the Unit
Test will run the air handler.
The
unit
will
work
the
same
way
in
either
Communicating
or 24VAC modes.
To access
the Unit
Test Mode scroll
down through
the User
Interface
Information
Menu
until
you see
Installer's
Guide
the
Unit
Test
option.
Press
ENTER.
When
prompted
select
YES and press
ENTER.
When
the
User Interface
displays
ARE YOU SURE?
select YES
and press ENTER
to begin the Unit Test.
NOTE:
While
in Test
Mode
all thermostat
requests
will
be
ignored
but
if any
button
on
the
User
Interface
is pressed,
the Unit Test will
exit.
The Unit
Test
will
exit if a fault
is detected
during
the
test
sequence.
The
Unit
Test
will
perform
the
following
steps
without
delays.
1. Start
blower
at 50% airflow
and
Energize
EAC
relay.
2. After 10 seconds, go to 100% airflow for 10 seconds.
(User Interface displays UNIT TEST - BLWR)
3. Energize
Y1 relay for 15 seconds with 100% airflow.
(User Interface displays UNIT TEST - COOL)
4. De-energize
Y1 relay
and
go to Electric
Heat
airflow.
(User Interface displays UNIT TEST - HEAT)
5. Energize
blower interlock
and stage 1 heat relay.
6. Energize
humidifier
relay.
7. After 1 second energize stage 2 heat relay.
8. After 1 more second energize
stage 3 heat relay.
9. After 5 seconds
de-energize
blower interlock,
stage
1, 2 & 3 heat, humidifier
and EAC relays.
(User Interface displays UNIT TEST - EXIT)
Displayed
for three seconds
NOTE: Airflow is default or programmed selections.
Figure 18
Viewing Window
USERINTERFACE
Push left & right to scroll
through menu options
Push up & down
to scroll through
setup menu
/
/
Push ENTER to make selection
User Interface pictured above adjusts variable speed airflow options.
18-GE11 D1-4
11
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