AAON F1-060, Installation, Operation & Maintenance Manual, Page: 22 / 56

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Thermostat
Units without the neutral air
dehumidification feature will operate with
most common thermostats. Units with the
neutral air dehumidification feature must use
thermostats with a normally closed (NC)
dehumidification option. The following stats
have been approved for usage with the
dehumidification feature.
Robertshaw Honeywell
9825i2
VisionPRO

IAQ
Filters
Open filter access bracket and slide correct
filter in with arrow pointing towards the
blower in the direction of airflow.
Replacement filters are 20” x 20” x 1”.
Charging Refrigerant
The unit comes with full charge based on a
25-foot line set. Charging a system in the
field must be based on determination of
liquid sub-cooling and evaporator superheat.
On a system with a thermostatic expansion
valve,
liquid sub-cooling is more
representative of the charge than evaporator
superheat but both measurements must be
taken.
Before Charging
The unit being charged must be at or near
full load conditions before adjusting the
charge.
Units equipped with hot gas reheat must
have the hot gas reheat valves closed to get
the proper charge.
Units equipped with hot gas reheat must be
charged with the hot gas valve closed while
the unit is in cooling mode.
After adding or removing charge the system
must be allowed to stabilize, typically 10-15
minutes,
before making any other
adjustments.
The type of unit and options determine the
ranges for liquid sub-cooling and evaporator
superheat. Refer to Error! Reference source
not found. when determining the proper sub-
cooling.
The vertical rise of the liquid line must be
known in order to adjust the sub-cooling
range for proper charge.
The Clean Air Act of 1990 bans the
intentional venting of refrigerant as of
July 1, 1992. Approved methods of
recovery, recycling, or reclaiming
must be followed.
CAUTION