PTAC-SVX004A-EN
21
protection). The unit does not display protection status
codes 8, 9, or 10. When multiple protection codes
overlap, they cycle through the display without priority.
Refer to Table 8, p. 33 for a list of error codes.
NNoottee:: If there is an error with the temperature sensor,
only the indoor fan responds in cooling mode.
Other loads do not respond, but the buttons are
still valid.
Mode Functions
Cooling Mode Functions
• When the ambient temperature is 2°F above
setpoint, the unit operates under cooling. Both the
outdoor fan and indoor fan operate in the set speed.
When the starting condition of compressor is
reached, outdoor fan operates and compressor
begins operation 10 seconds later.
• When the ambient temperature reaches 2°F below
setpoint, the unit stops operation, whereby, the
compressor and outdoor fan stop operation. Under
indoor fan cycle mode, the indoor fan stops
operation after operating at set fan speed for 60
seconds (except when it requires the indoor fan to
operate in protection mode). If the fan cycle mode is
not selected, the indoor fan operates at the set fan
speed.
• When the indoor fan is set at high speed, the
outdoor fan operates at high speed.
• When the indoor fan is set at low speed, outdoor
fan operates at low speed.
• When the unit starts in cooling mode for the first
time and the indoor fan is set to low speed, the
outdoor fan starts at high speed. After operating for
3-1/2 minutes and the outdoor tube temperature is
below 140°F (60°C), the outdoor fan switches over
to low speed. First time start-up includes, when
switching to low speed cooling from non-cooling
mode or when the unit starts low speed cooling for
the first time or enter low speed cooling after a
power failure.
• During cooling mode, and when there is no outdoor
condenser high temperature condition, the unit
stops:
– When it reaches the setpoint.
– When the unit stops for a temperature sensor
error.
– When the unit stops for freeze protection.
– When the start-up condition of outdoor fan is
met.
– When the indoor fan operates at high fan speed
for 3 seconds and then turn to set fan speed.
If high temperature protection occurs during
cooling mode, the outdoor fan is forced to
operate at high speed. When the start-up
condition of outdoor fan in heating mode is met,
the outdoor fan operates at high fan speed for 3
seconds and then turns ON to set the fan speed.
When the indoor fan starts operation, the indoor
fan operates at high fan speed for 3 seconds and
then turns ON to set fan speed.
• Press the Constant Fan button when in cooling or
heating mode to turn ON/OFF the constant fan
function. this function is invalid in wired controller
mode. If constant fan mode is ON, the fan motor
constantly operates. If constant fan mode is OFF,
the fan stops as the load stops. The fan speed is
controlled by the Fan Speed button (if a wired
controller is connected, the fan speed follows the
command of wired controller). The controller
controls whether the fan is operating or not. The
status does not change when:
– Switching modes.
– When turning the unit ON/OFF.
– Switching to wired controller mode.
– Switching to panel mode.
– Energizing after a power failure.
Heating Mode Functions
When the heating mode LED is lit, and the set fan
speed LED is ON. The digital display shows the set
temperature. If select displaying ambient temperature
in additional function setting, the digital display shows
as described in this mode. The set temperature and fan
speed will keep the same when switching modes.
Function
FFoorr HHeeaatt PPuummpp ((GGeenneerraall TTyyppee))
NNoottee:: The electric heater and compressor cannot
operate at the same time.
• When ambient temperature of the space is 2°F
below setpoint, the compressor operates in heating
mode. The four-way valve and both the indoor/
outdoor fans start operation at set speed. After 10
seconds, the compressor begins operation. If the
compressor operates and satisfies the setpoint and
minimum operation time of the compressor, then
both the compressor and indoor/outdoor fans de-
energize. If the compressor does not meet setpoint
and the ambient temperature drops to 5°F below
setpoint, the compressor de-energizes and after
one second, the electric heater starts. The electric
heater remains in operation until the setpoint +2°F
is satisfied.
NNoottee:: The minimum compressor run time is 6
minutes
• When there is a call for heat and the compressor
cannot be energized due to the protection function,
the electric heat energizes after 15 seconds and
remains energized until the setpoint +2°F is
satisfied.
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