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TROUBLESHOOTING
If the compressor
fails to operate
with a cooling
call, Table 4 can be
used to verify
if there is any damage
to the compressor
windings
causing
system
malfunction.
Table 4 - Winding
Resistance
Winding resistance at 70°F +/- 20°F
(21.11°C +/-
11.11°C)
Winding
24ANB724
24ANB736
24ANB748
24ANB760
/
/
/
/
24ANB124
24ANB136
24ANB148
24ANB160
Start
1.40
1.29
1.52
0.60
(s-c)
Run
1.32
0.89
0.64
0.49
(R-C)
Systems
Communication
Failure
If communication
with the Infinity Control is lost with the user
interface, the control will flash the appropriate fault code, (See
Table 6) Check the wiring to the User Interface,
indoor and
outdoor units,
Model
Plug
Each control board contains a model plug. The correct model plug
must be installed for or the system to operate properly (see Table
5).
Model
Number
24ANB724
24ANB736
24ANB748
24ANB760
24ANB124
24ANB136
24ANB148
24ANB160
Table 5 - Model
Plug
Model
Plug
Number
Hk70EZ040
Hk70EZ042
Hk70EZ044
Hk70EZ046
Hk70EZ009
Hk70EZ011
Hk70EZ013
Hk70EZ015
Pin Resistance
(k - Ohms)
Pin 1 - 4
Pin 2- 3
18K
75K
18K
120K
18K
180K
18K
270K
5.1K
91K
5.1K
150K
5.1 K
220K
5.1 K
360K
The model
plug is used to identify
the type and size of unit to the
control.
On new units,
the model
and serial numbers
are input
into the
board's
memory
at the factory.
If a model
plug is lost or missing
at
initial
installation,
the
unit
will
operate
according
to
the
information
input
at the factory and the appropriate
error code will
flash temporarily.
An
RCD
replacement
board
contains
no
model
and
serial
information.
If the factory control
board fails, the model
plug must
be transferred
from the original
board to the replacement
board for
the unit to operate.
NOTE:
The
model
plug
takes
priority
over
factory
model
information
input
at the factory.
If the model
plug is removed
after
initial
power
up, the unit will operate
according
to the last valid
model
plug
installed,
and
flash
the
appropriate
fault
code
temporarily.
Pressure
Switch Protection
The outdoor
unit is equipped
with high and low pressure
switches.
If the control
senses the opening
of a high or low pressure
switch,
it will respond
as follows:
1. De-energize
the appropriate
compressor
contactor,
2. Keep the outdoor
fan operating
for 15 minutes,
3. Display
the appropriate
fault code (see Table 6).
4. After a 15 minute
delay, if there is still a call for cooling
and
the LPS or HPS is reset, the appropriate
compressor
contac-
tor is energized.
5. If LPS or HPS has not closed
after a 15 minute
delay, the
outdoor
fan is turned off. If the open
switch closes
anytime
after the 15 minute
delay, then resume
operation
with a call
for cooling.
6. If LPS or HPS trips 3 consecutive
cycles,
the unit operation
is locked out for 4 hours.
7. In the event of a high pressure
switch
trip or high pressure
lockout,
check the refrigerant
charge outdoor
fan operation
and outdoor
coil for airflow
restrictions.
8. In the event of a low pressure
switch
trip or low pressure
lockout,
check the refrigerant
charge and indoor
airflow.
Control Fault
If the outdoor
unit control
board has failed,
the control
will flash
the appropriate
fault code. (See Table 6) The control
board should
be replaced.
Brown Out Protection
If the line voltage
is less than
187v for at least 4 seconds,
the
appropriate
compressor
contactor
and fan relay are de-energized.
Compressor
and fan operation
are not allowed
until voltage
is a
ndninmm
of 190v. The control
will flash the appropriate
fault code
(see Table 6)
230
V Brown
Out
Protection
Defeated:
The brownout
feature
can be defeated
if needed
for severe
noisy
power
conditions.
This
defeat
should
always
be a last resort to
solving
the problem.
Defeat
is available
on the User
Interface
setup
screen
(available
with
SYSTXBBUID01-C
UI) or can be
initiated
through
the forced
defrost
pins for non-communicating
systems
as follows:
The brownout
toggle
is accomplished
by shorting
the defrost
pins
from power
up with the OAT and OCT sensor connector
removed.
After
3 seconds,
the
status
of the force
defrost
short
and the
OAT/OCT
as open
will be checked.
If correct,
then the brownout
will be toggled.
• Status code 6 shows
the brownout
is disabled.
• Status code 5 shows
the brownout
is active.
After
the brownout
defeat
is set, power
down
and reinstall
the
OAT/OCT
sensor
and remove
the short
from
the forced
defrost
pins.
As long as the short on the forced defrost
remains,
the OAT
and OCT faults will not be cleared.
The code will continue
to be
flashed.
The control
is shipped
with
the brownout
active.
The change
in
status
is remembered
until
toggled
to a new
status.
A power
down/power
up sequence
will
not reset
the status.
It may be
necessary
to do the toggle
twice to cycle to the desired
state of the
defeat.
230V Line (Power
Disconnect)
Detection
If there is no 230v at the compressor
contactor(s)
when
the indoor
unit is powered
and cooling
demand
exists,
the @propriate
error
code is displayed
(see Table 6). Verify that the disconnect
is closed
and 230v wiring
is connected
to the unit.
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