LG AR-DR12-05A Installation And Operation Manual page 40

OPTIONAL COMPONENT OPERATION
Hot Gas Bypass Valve (standard scroll)
On units equipped with hot gas bypass, hot gas from the compressor is injected into the
liquid line of the evaporator coil after the thermostatic expansion valve. This process
starts to occur when suction gas temperatures drop below 28°F, which is 32°-34°F coil
surface temperature. Hot gas helps the evaporator coil from freezing up and the com-
pressor from cycling. The valve needs to be adjusted to exact specifications once unit is
installed in the field.
Hot Gas Reheat Valve
Units equipped with a reheat coil use a three-way valve with actuator to control the
supply air discharge temperature of the unit during dehumidification mode. The unit
controller provides a 0-10 VDC signal to control the amount of reheat to meet the supply
temperature set point.
Controls by Others
The reheat coil needs to be purged to ensure adequate oil return. It is recommended
that every six hours of reheat compressor run time should initiate a six minute purge
cycle. During the purge cycle, the reheat valve should be modulated to 100% open to
the reheat coil.
Due to our policy of continuous product innovation, some specifications may change without notification.
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