23
Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
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Step 8
8. Turn on Function Code “Fn23” to activate the outdoor internal logic to operate the drain pan heater element.
The Function Code “Fn23” informs the master outdoor unit microprocessor that the optional drain pan heater is installed in the outdoor unit.
The microprocessor will power outdoor unit PCB terminal “CN25_Basepan Heater” when at least one (1) compressor in the frame is operat-
ing, the outdoor air temperature is <39ºF, and either the following conditions occur:
• Outdoor unit is operating in heating.
• Outdoor unit is in defrost.
The controller will shut off drain pan heating operation when the outdoor air temperature rises >39ºF, or when all compressors stop operating.
Figure 17: Setting the Drain Pan Heater Function.
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to ON.
Select the “Func” mode by using the SW03C forward ►button and the SW02C
backward ◄ button, and then press the SW01C confirm ● button.
Select the “Fn23” function by using the SW03C forward ►button and the SW02C
backward ◄ button, and then press the SW01C confirm ● button.
Select from “oFF” or “on” options by using the SW03C forward ►button and the SW02C
backward ◄ button, and then press the SW01C confirm ● button.
The Drain Pan Heater Operation Function is set.
PCB does not need reset.
Settings Drain Pan Heater Kit Installed
oFF (Default) No
on Yes
Table 2: Setting the drain pan heater function.
Figure 18: No. 5 on DIP Switch Bank SW01 ON.
1 2 76543
1 2 76543
ON
OFF
• To set this optional mode / functions, all indoor units must be OFF.
Mode / function settings won’t save, nor will operate unless all indoor
units are OFF.
• If system power was reset, some modes / function settings will be
automatically saved in the EPROM. Other modes / functions will re-
set when power is cycled off.
DRAIN PAN HEATER INSTALLATION
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