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Fan Cycle Control
The ‘Auto’ indoor fan cycle control setting allows the unit
to operate more efficiently. This feature conserves energy
by operating the fan only while the compressor or heater
is operating. Constant fan operation in High or Low set-
tings is also available.
Room Freeze Prevention
The indoor freeze protection monitoring system prevents
unoccupied rooms from reaching freezing levels that can
damage plumbing and fixtures. This feature is automatic
regardless of mode and does not require any additional
settings. This feature can be turned on or off by adjusting
DIP switch settings on control board.
High Temperature
Compressor Protection
The life of the compressor is extended through a built in
temperature protection. The system will initiate a com-
pressor lockout if the compressor temperature exceeds
154 °F or if the outdoor air temperature falls below 35 °F.
Low Temperature
Compressor Protection
An indoor frost sensor will disable the operation of the
compressor if freezing conditions exist. This protects
the compressor from damage due to airflow reduction
or low outdoor air temperature. When the coil tempera-
ture rises to a safe temperature the compressor resumes
normal operation.
System Controls and Management
(
cont.
)
Diagnostic Software
The system management software performs self-diag-
nostic tests that can alert service personnel to potential
problems. Error codes are stored and displayed on the
digital display and can save service call time during
troubleshooting and maintenance.
See page 43 for a list of Error Codes
Custom Operation
and Continual Room
Temperature Monitoring
The system controls utilize a built-in temperature sensor
for measuring room temperature. When a pre-deter-
mined (user defined) temperature set point is reached,
the on-board controls automatically adjust unit operation
to match.
See page 42 for Temperature Limiting details
System Management Software
The Islandaire PTAC unit is equipped with an on-board control system that contains system management software and
sensors. Built in safety features protect the unit from the damaging effects of freezing temperatures and power interrup-
tions. Energy management features allow unit performance to be customized and control power consumption. System
monitoring software helps service personnel quickly correct any problems.
Listed below are some of the important control features and a brief description of their functions.
See Performance Specifications section starting on page 44 for full details of all functions.
