SERVICING
37
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 ther-
mostat requests will be ignored while in emergency opera-
tion.
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
