Sea Breeze PTAC Service Manual page 18

heating function 10 seconds later and run until the room temperature is satisfied.
When Tamb – Tamb. compensation ≤ Tpreset -2 ℉(1 °C), the unit is running in heating mode. Meanwhile,
the compressor will be started up.
When Tamb – Tamb. compensation≥ Tpreset +2 ℉(1 °C), the compressor and the fan will be turned off.
When Tpreset -2 ℉(1 °C) < Tamb – Tamb. compensation < Tpreset +2 ℉(1 °C), the unit keeps previous
running status.
If the room temperature (Tamb) falls to 5 °F below the set point temperature (Tpreset) the reverse cycle
heat will be shut off and the electric strip heat is turned on for one cycle 15 seconds later; and stop the
operation when heating set point is satisfied.
* In this mode, the electric strip heaters and the compressor will not operate simultaneously.
The unit displays the setting temperature and heating LED is illuminated. The setting temperature range is
55 ~ 80 ℉ (13 ~ 27 °C).
5) OFF Mode
If the OFF mode is selected, all the display will be closed except the power indicator and all the output are
invalid. (Except the low temperature resistant protection)
If the WARMER or COOLER button is pressed, the unit display will extinguish after it displays the ambient
temperature for 15 seconds and the indoor indicator will also go out after illuminated 15 seconds. By
repressing the WARMER and COOLER button in the process of displaying the ambient temperature, 15
second will be calculated again.
6) Low Temperature Resistant Protection
This is valid in OFF, cooling, dry or fan mode.
Entry condition: if the dip switch 1 is on "UP" position, and the room temperature is lower than 40 ℉ for 5
seconds continuously, the low temperature resistant protection will be activated.
Quit condition: When the room temperature raises more than 50 ℉, the low temperature resistant protection
will be deactivated.
During the low temperature resistant protection, the unit displays "FP" and the running LED is in green
color (including the OFF status). During this period, the unit won't be controlled by the wall thermostat and
it will ignore the signal from the wall thermostat.
7) Open circuit and short circuit of temperature sensor
If the temperature sensor is open circuit or short circuit, the error code displays when the unit is turning on.
If the failure of the temperature sensor is detected, only the indoor fan will keep running in Cooling and Fan
mode.
If the failure of the temperature sensor is detected in Heating mode, the indoor fan will blow the residual
heat for 6 seconds and then turns off. Once the fan is stopped, it cannot be started up again. If the failure
of the temperature sensor is detected during the residual heat blowing, the fan will be stopped after
blowing 1 minute later.
3. Buttons and Display
1) Buttons
There are ON/OFF, WARMER, COOLER, MODE, FAN SPEED and TIMER six buttons in all.
a) In the OFF status, press the ON/OFF button to turn on the unit. In OFF mode, if press the WARMER or
COOLER button, the display will be extinguished after the room temperature shows 15 seconds.
Pressing the MODE button in the OFF status, the previous mode will be activated and the running LED
will be illuminated in green.
b) In the ON status, all buttons are in valid.
i) ON/OFF: Pressing this button, the unit can be switched between ON and OFF mode.
ii) MODE: Pressing this button, the unit can be switched among cooling, fan dry and heating made
circularly.
iii) FAN SPEED: In the ON status, the fan speed can be selected to high, low and auto by pressing
this button.
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