16
SYSTEM OPERATING CONDITIONS
OPERATING RANGE MIN / MAX °F (°C)
COOLING HEATING
Outdoor DB -4~122 (-20~50) -22~86 (-30~30)
NOTE:
S If the air conditioner is used beyond the above
conditions, certain safety protection features may engage
and cause the unit to operate abnormally.
ELECTRONIC FUNCTIONS
Main Protection
Three Minute Delay for Compressor Restart
Less than a 1 minute delay for the initial start−up and a 3 minute
delay for subsequent starts.
Compressor Top Temperature Protection
The unit stops working when the compressor top temp. protector
cuts off, and restarts after the compressor top temp. protector
restarts.
Compressor Discharge Temperature Protection
When the compressor discharge temp. increases, the running
frequency is limited per the following rules:
S Compressor discharge temp. T5>239° F(115° C) for 5s,
compressor stops and restarts up until T5<194° F (90° C)
S 110<T5<239° F(115° C), decrease the frequency to the
lower level every 2 minutes.
S 221° F(105° C)<T5<230° F(110° C), keep running at the
current frequency.
S T5<221° F(105° C), no limit for frequency.
Fan Speed is Out of Control
When the indoor fan speed remains low (lower than 300RPM) for
50s, the indoor fan shuts off and restarts 30s later. If the protection
mode engages 3 times when the fan motor restarts continuously,
the unit stops and the LED displays the failure.
When the outdoor fan speed remains low (lower than 100RPM) or
too high (higher than 1500RPM) for 60s, the unit stops and the
LED displays the failure. The malfunction clears 30s later.
Inverter Module Protection
The inverter module has a protection function for current, voltage and
temperature. If any of these protections engage, the corresponding
code displays on the indoor unit and the unit stops working.
Indoor Fan Delayed Open Function
When the unit starts up, the louver is active immediately and the
indoor fan opens 10s later. If the unit is running in the Heating mode,
the indoor fan is controlled also by the anti−cold wind function.
Compressor Preheating Functions
Preheating Permitting Condition:
If T4＜37.4° F(3° C) and the machine connects to power supply newly
within 5 seconds or if T4
＜37.4° F(3° C) and the compressor has
stopped for over 3 hours, the compressor heating cable will work.
Preheating Mode:
A weak current flow through the compressor coil from the
compressor wiring terminal, then the compressor is heated without
operation.
Preheating Release Condition:
If T4
≥41° F(5° C) or the compressor starts running, the preheating
function stops.
Condenser High Temperature T3 Protection:
S 131° F(55° C)<T3<140° F(60° C), the compressor
frequency decreases to the lower level until to F1 and
then runs at F1. If T3<129.2
° F(54° C), the compressor
keeps running at the current frequency.
S T3<125.6° F(52° C), the compressor does not limit the
frequency and resumes the former frequency.
S T3>140° F(60° C) for 5 seconds, the compressor stops
until T3<125.6° F(52° C).
Evaporator Low Temperature T2 Protection:
S T2<32° F(0° C), the compressor stops and restarts when
T2≥41° F(5° C).
S 32° F(0° C)≦T2<39.2° F(4° C), the compressor frequency
is limited and decreases to the lower level
S 39.2° F(4° C)≤T2<44.6° F(7° C), the compressor retains
the current frequency
S T2>44.6° F(7° C), the compressor frequency is not
limited.
Operation Modes and Functions
Fan Mode
1 Outdoor fan and compressor stop.
2 Temperature setting function is disabled and no setting
temperature is displayed.
3 Indoor fan can be set to high/med/low/auto.
4 The louver operates the same as in cooling mode.
5 Auto fan
Fig. 12 – Fan Mode
7
A DC_FAN_HI_SPD_ADD
B DC_FAN_MID_SPD_ADD
C DC_FAN_MIN_SPD_ADD
D DC_FAN_SLOW_SPD_ADD
E DC_FAN_SSLOW_SPD_ADD
28ć(82.4°F)
19ć(66.2°F)
17ć(62.6°F)
26ć(78.8°F)
25ć(77°F)
23ć(73.4°F)
22ć(71.6°F)
20ć(69°F)
P
Fig. 13 – Outdoor Fan Running Rules
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