SERVICING
33
2. COOLING EMERGENCY MODE
Cooling emergency mode is to be used when communica-
tion between the indoor and outdoor units is not functioning
properly and temporary cooling operation is required. This
mode enables the outdoor unit and indoor unit to run inde-
pendently of each other. There are two key steps to setup
Cooling Emergency Mode.
a.
Select the appropriate airflow on the indoor unit
and enable emergency indoor airflow operation
(using Dip switches S-13 and S-14 of Switch Bank
DS-4 on the indoor unit to select desired 25%,
50%, 75% or 100% airflow. In addition, set switch
bank DS-6 dip switches S-21 to ON and S-22 to
OFF enabling emergency indoor fan).
b. Select the desired cooling level at the outdoor
unit (there are 3 levels available: Low Cool Level,
Medium Cool Level, High Cool Level selectable
by dip switch bank DS-2 on the outdoor unit). See
Dip Switch Position DS2-1 and DS2-2 Table for
cooling level selection.
Function
Value
SW13
SW14
SW15
SW16
25
OFF
OFF
-
-
50
ON*
OFF*
-
-
75
OFF
ON
ON*
-
100
ON
ON
OFF
-
Switch Bank DS-4
Indoor Fan Settings
Fan Only
Speed %
During operation the indoor unit will provide constant airflow
as selected (even if the compressor has stopped). The
indoor unit will continue to operate the electronic expansion
valve for refrigerant super heat control and the compressor
will cycle at the interval selected by dip switch bank DS-2.
ON time
OFF time
Avg.
Run Time
Low Cool
Level
7 minutes
15 minutes
30%
Medium
Cool Level
8 minutes
10 minutes
50%
High Cool
Level
15 minutes
6 minutes
70%
NOTE:
This mode does not require a thermostat. Any
thermostat requests will be ignored while in emergency
operation.
NOTE:
Set indoor DS-4 (Indoor fan setting) and DS-6 (In-
door emergency mode enable) before setting outdoor DS-2
dip switch settings. Otherwise, the compressor may be
damaged in operation.
NOTE:
When proper communication is established, these
switches must be returned to default settings
The compressor speed will automatically adjust based on
the outdoor ambient temperature. If ambient temperature
is higher than 95°F, the outdoor unit can operate at 100%
compressor speed. If ambient temperature is lower than
70°F, the unit will run at 50% compressor speed. Between
95°F and 70°F, the compressor speed will adjust linearly as
shown.
100%
50%
70F
95F
Compressor
Capacity
Ambient
temp
COOLING EMERGENCY MODE WIRING FOR TXV AP-
PLICABLE INDOOR UNIT
Cooling emergency mode is available when using a TXV ap-
plicable indoor unit. To energize the blower at the appropriate
speed, standard Legacy wiring is required. The image below
shows how the thermostat input terminals are to be wired
when selecting a cooling airflow.
NOTE:
The blower will run
continuously with this wiring which is required. The outdoor
unit will cycle as described in the Cooling Emergency Mode
section when appropriate dip switch modes are set.
1 2 R C G W1 W2 Y1 Y2 0
DEHUM
INDOOR UNIT INTEGRATED CONTROL MODULE
NOTE:
Emergency heating mode is not available with TXV
applicable indoor units. If communications still exist be-
tween the indoor unit and thermostat, the thermostat should
be used to provide heating calls.
