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3
OVERVIEW OF UNITS
3-1. Auxiliary heating on/off control set-up
■ Auxiliary heating operation controls another heat source that depends on the main system's oper-
ations, which means the interlock operation shown in 2 below will be possible.
1. Indoor unit must be R410A UL model for this function to operate.
2. Different indoor unit applications that can be applied:
■ Outdoor unit DIPSW5-4 for auxiliary heating control:
• Set DIP SW5-4 when the power of the unit is turned off.
- OFF: Auxiliary heating function is disabled. (Initial setting)
- ON : Auxiliary heating function is enabled.
■ Determine required indoor fan speed during defrost mode:
• To set the fan speed, see the chapter referring to heater control in the indoor unit's Technical & Service Manual.
■ Determine fan speed setting during indoor thermo-OFF conditions:
• These settings are done within indoor DIP SW1-7 and DIP SW1-8. See the chart below for options.
• Recommended SW1-7 OFF and SW1-8 ON will determine airflow based on "Setting on the remote controller".
Auxiliary heating signal
Thermo condition
SW1-7
OFF
ON
OFF
ON
■ Setting outdoor unit and auxiliary heat switch over temperatures
When the DIP SW 5-4 is set to "ON", the outdoor unit and the contact output operates as shown below.
• Outdoor default setting and operations are shown below:
OCH800A_7
Fan speed setting
OFF
SW1-8
-
OFF
Very low
OFF
Low
ON
Setting on remote controller
ON
Stopped
Fan speed setting
ON
-
Setting on remote controller
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