Overall Defrost Operating In Low Temperatures (Heating) (Fn22); Drain Pan Heater (Optional) Function (Fn23) - LG Multi V5 Service Manual

OTHER CONTROLS
Setting Optional Modes
Overall Defrost Operating in Low
Temperatures (Heating) (Fn22)
The Overall Defrost Operating in Low Temperatures function
overrides LG's Intelligent Defrost algorithm, and first defrosts the
lower half of the coil, and then defrosts the full coil. On multi-frame
systems, all frames are in defrost simultaneously. Defrost operation
occurs every three (3) hours, irrespective of need, whenever the
Used in locations where heavy snow fall is prevalent, or when a
small amount of ice build-up on the outdoor unit coil has a noticeable
impact on building comfort.
Overall Defrost Operating in Low Temperatures can also be used
with Fn4 - Overall Defrost, Fn6 - Snow Removal Assist / Rapid
Defrost, and SE6 - Forced Defrost.
For use on both heat pump and heat recovery systems.
Table 36: Setting the Overall Defrost Operating in Low Temperatures (Heating).
Settings
oFF (Default)
on
Drain Pan Heater (Optional)
Function (Fn23)
Informs the master outdoor unit microprocessor that
an optional field-installed drain pan heater (sold
separately) is installed. The optional drain pan heat-
er maintains the bottom of the outdoor unit >32ºF to
keep condensate from freezing.
Selecting to engage this option must only be done
if a properly sized pan heater is in place to keep
the bottom surface of the outdoor unit >32°F. The
microprocessor will power outdoor unit PCB terminal
CN25 when at least one (1) compressor in the frame
is operating, the outdoor air temperature is <39ºF,
and either the following conditions occur:
1. Outdoor unit is operating in heating.
2. Outdoor unit is in defrost.
The controller will shut off the drain pan heating
operation when the outdoor air temperature rises
>39ºF, or when all compressors stop operating.
For use on both heat pump and heat recovery
systems.
On multi-frame systems, it is possible for one (1) or more frame(s) to be operating in heating, and have another frame operating in cooling. Setting
value must be set on a per frame basis on multi-frame systems.
74
Overall Defrost Operating in Low Temperatures Enabled
Figure 26: Setting the Drain Pan Heater Function.
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to ON.
Table 37: Setting the Drain Pan Heater Function.
Settings
oFF (Default)
on
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 25: Setting the Low Temperatures Defrost Function (Heating).
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
Overall Defrost Operating in Low Temperatures (Heating) is set.
PCB does not need reset.
No
Yes
The Drain Pan Heater Operation Function is set.
PCB does not need reset.
Drain Pan Heater Kit Installed
Yes
No