Operation; Refrigerant Detection System; Thermostat Operation - AAON RN Series Installation Operation & Maintenance

Operation

Unit operations must be controlled with
thermostat, or unit controller, never at the
main power supply, except for servicing,
emergency, or complete shutdown of the
unit.

Refrigerant Detection System

Unit is equipped with a Refrigerant Detection
System (RDS) to detect leaked refrigerant
within the conditioned airstream. The RDS
consists of a mitigation board and one or
more refrigerant sensors in the conditioned
airstream. In the event of a refrigerant leak
that could leak into the occupied space, the
RDS sensors will send an alarm to the
mitigation board. In the event of an alarm, the
compressor operation is disabled and the
indoor blower is enabled to provide
circulation airflow in accordance with
UL 60335-2-40. The board will remain in
alarm state for five minutes after RDS sensor
has cleared the alarm below the concentration
setpoint.
The mitigation board is equipped with an
alarm output. For VAV applications and
applications utilizing zone dampers, the
VAV boxes and zone dampers must be wired
to the mitigation board output to open all
VAV boxes and zone dampers to allow for
the required circulation airflow to prevent
stagnation of leaked refrigerant.
Verify functionality of RDS by removing
sensor connection at the mitigation board and
ensuring that all sequences above take place,
including the opening of VAV boxes and
zone dampers if applicable.
CAUTION
Refrigerant sensors may only be
replaced with manufacturer approved
sensors.
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Thermostat Operation

Heating
Thermostat system switch - "Heat"
Thermostat fan switch - "Auto" or "On"
Thermostat temperature set to desired point.
Cooling
Thermostat system switch - "Cool"
Thermostat fan switch - "Auto" or "On"
Thermostat temperature set to desired point.
Air Circulation
Thermostat system switch - "Off"
Thermostat fan switch - "Auto" or "On"
No change of the thermostat temperature.
With these settings, the supply blower will
run continuously but the supply air will not
be heated, cooled, or dehumidified.
System Off
Thermostat system switch - "Off"
Thermostat fan switch - "Auto"
No change of the thermostat temperature.
With these settings the system is shut down,
with the exception of control system power.
Night and Weekend Unoccupied Operation
To reduce the operating time of the unit when
the space is unoccupied, such as nights and
weekends, it is recommended that the
temperature setting be raised about 5°F while
unoccupied during the cooling season and
lowered about -12.2°C (10°F) during the
heating season.