MXZ-SM48NAMHZ Service Manual

4
5
OCH789
2
OVERVIEW OF UNITS
2-1. Auxiliary HEATING ON/OFF CONTROL SET-UP
(1) Auxiliary heating operation controls another heat source that depends on the main system's operations,
which means the interlock operation shown in "b)" will be possible.
a)
b) Different Indoor unit applications that can be applied:
(2) Outdoor unit DIPSW5-4 for auxiliary heating control:
Set DIPSW5-4 when power is turned off at unit.
OFF:
Disable auxiliary Heating Function (Initial setting)
ON :
Enable auxiliary Heating Function
Indoor unit must be R410A UL model for this function to operate.
(3) 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.