Manufacturer of Quality Air Conditioning and Heating Products • www.islandaire.com • sales@islandaire.com • (800)-886-2759
41
System Controls and Management (
cont.
)
SySTEM MANAGEMENT SOFTWARE
The Islandaire EZGS PTAC 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
interruptions. Energy management features allow unit performance to be customized and control power consump-
tion. 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 50 for full details of all functions.
Fan Cycle Control
The indoor fan cycle control allows the unit to oper-
ate more efficiently. This feature conserves energy by
operating the fan only while the compressor or heater is
operating. Constant fan operation in High, Low, or Auto
settings 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 the 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.
Compressor Short Cycle protection:
Built-in three minute timing delay: If cycle is
interrupted, the compressor will not restart for
three minutes.
Initial power up on remote thermostat units
will have a one time, three minute delay before
the compressor will start. Units using built in
controls will power up immediately.
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 temperature
rises to a safe temperature the compressor resumes
normal operation.
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 49 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 48 for Temperature Limiting details.
Auto Restart Feature:
To prevent multiple units from powering
up simultaneously after a power outage,
there will be a random 5 to 15-second
delay before the unit turns on after power
has been restored.
