SERVICING
71
2. COOLING EMERGENCY MODE
Cooling emergency mode is to be used when communica-
tion between the indoor and outdoor units is not func-
tioning properly and temporary cooling operation is re-
quired. This mode enables the outdoor unit and indoor
unit to run independently 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 air-
flow 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.
DS2-1 DS2-2
ON ON Normal Operation
ON OFF
Emergency Mode
(Low Cool Level)
OFF ON
Emergency Mode
(Medium Cool Level)
OFF OFF
Emergency Mode
(High Cool Level)
Dip Switch Position
Function
ON time OFF time
Avg.
Run Time
Low Cool
Level
7 minutes 15 mi nutes 30%
Medium
Cool Level
8 minutes 10 mi nutes 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 (Indoor
emergency mode enable) before setting outdoor DS-2 dip
switch settings. Otherwise, the compressor may be dam-
aged 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 tempera-
ture 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
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