Manufacturer of Quality Air Conditioning and Heating Products • www.islandaire.com • sales@islandaire.com • (800)-886-2759
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Information for Heat Pump units
Heat pump models offer substantial savings over models
with conventional electric resistance heaters.
Islandaire’s PTAC units provide indoor comfort in the
same manner as conventional air conditioners, removing
heat and humidity from indoor air. The heat and humid-
ity is released to the outdoors. Islandaire’s high efficiency
design saves energy and reduces cooling costs.
When the outdoor coil temperature is above 20 °F
(approximately 35 °F outdoor-air temperature), the heat
pump draws heat from outdoor air and uses it to heat
indoor air. Since heat is transferred and not produced,
the heat pump uses less electricity and reduces energy
costs significantly.
If the outdoor coil temperature falls below 20 °F (approx-
imately 35 °F outdoor-air temperature), the unit auto-
matically switches on a built-in electric heater. The com-
pressor stops and a blower circulates warm air produced
by the heater. When the outdoor coil temperature rises
above 40 °F, heat pump operation resumes automatically.
Heat Pump Features
OUTDOOR ThERmOSTAT:
During the heating cycle, the outdoor thermostat senses
outdoor coil temperature. It switches the unit to electric
heat mode when the outdoor coil temperature is 20 °F or
below (approximately 35 °F outdoor-air temperature).
The thermostat switches the unit back to heat pump
mode when the outdoor coil temperature rises above 40
°F, which is enough to provide heat to meet demand. The
entire operation is completely automatic.
REVERSING VALVE:
The reversing valve controls the direction of refrigerant flow
for both heating and cooling functions and remains ener-
gized as long as the controls are in the heat position. When
the cooling controls are activated, the valve automatically
reverses to the cooling position.
NOTE: Be sure to connect reversing valve wiring to the
B (blue wire) connection of the thermostat for heat pump
applications.
