Gree 4LIV30HP230V1A Service Manual page 34

6. Function and Control
Service Manual
And after another 30 seconds, the four-way valve will be opened,
and after60 seconds, the compressor and the outer fan will be
started, the indoor fan will run under preset cold air prevention
conditions,and H1 will be displayed at temperature display area
on the display panel. Defrost frequency is 70 Hz.
3.Protection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
① In the case of Tindoor amb. < 75°F: if T tube ≤ 104°F and the
indoor fan is at stop state, the indoor fan will begin to run at low
speed witha time lag of 2 minutes. Within 2 minutes, if T tube
> 104°F, the indoor fan also will run at low speed; and after 1
minute operation atlow speed, the indoor fan will be converted to
operation at preset speed. Within 1 minute low speed operation
or 2 minute non-operation, if T tube > 108°F, the fan will run at
present speed.
② In the case of Tindoor amb. < 75°F: if Ttube ≤ 108°F, the
indoor fan will run at low speed, and after one minute, the indoor
fan will beconverted to preset speed. Within 1 minute low speed
operation, if Ttube > 104°F, the indoor fan will be converted to
preset speed.Note: Tindoor amb. indicated in ① and ② refers
to, under initially heating mode, the indoor ambient temperature
before the command to start the compressor is performed
according to the program, or after the unit is withdrawn from
defrost, the indoor ambient temperature before the defrost symbol
is cleared.
Total current up and frequency down protection
If the total current I
≤ 16A, frequency rise will be allowed; if
total
I ≥ 17A,frequency rise will not be allowed; if Itotal18A,the
total
compressorwill run at reduced frequency; and if Itotal20A, the
compressor will stop and the outdoor fan will stop with a time lag
of 60s.
(4) Fan Mode
Under the mode, the indoor fan will run at preset speed and
the compressor, the outdoor fan, the four-way valve and the
electricheater will stop.
Under the mode, temperature can be set within a range of
61°F~86°F.
(5) AUTO Mode
① Working conditions and process of AUTO mode
Under AUTO mode, standard cooling temperature Tpreset is 77°F
and standard heating temperature Tpreset is 68°F.
a. Once energized, if Tamb. ≤ 71.6°F, the unit will be started under
heating mode; if 71.6°F < Tamb.< 78.8°F, the unit will run under
fanmode and the run indicator will be bright; and if Tamb. ≥ 78.8°F,
the unit will be started under cooling mode.
b.Under AUTO mode,if Tamb. ≥ Tpreset +1.8ºF is detected,the
unit will select to run under cooling mode,in which case implicit
presettemperature is 77°F; if Tamb. ≤ Tpreset-1.8°F, the
compressor will stop, the outdoor fan will stop with a time lag of 1
minute, andtheindoor fan will run at preset speed; and if Tpreset-
1.8°F < Tamb. < Tpreset+1.8ºF, the unit will remain at its original
state.
c.Under AUTO mode, if Tamb. ≤ Tpreset+3.6°F is detected,
the unit will select to run under heating mode, in which case
implicit preset temperature is 64°F; if Tamb. ≥ Tpreset+9°F, the
compressor will stop, the outdoor fan will stop with a time lag of 1
minute,and the indoor fan will run under the mode of residue heat
Technical Information
blowing; and if Tpreset+3.6°F < Tamb.< Tpreset+41°F, the unit will
remainatits original state. The cooling-only unit will run under fan
mode.
d.Under AUTO mode, if 71.6°F < Tamb.< 78.8°F, the unit will
remain at its original state.
② Protection
a. In cooling operation, protection is the same as that under the
cooling mode;
b. In heating operation, protection is the same as that under the
heating mode;
c. When ambient temperature changes, operation mode will be
converted preferentially. Once started, the compressor willremain
unchanged for at least 6 minutes.
(6) Common Protection Functions and Fault Display under COOL,
HEAT, DRY and AUTO Modes
① Overload protection
Ttube:measured temperature of outdoor heat exchanger under
cooling mode; and measured temperature of indoor heat ex-
changer under heating mode.
1) Cooling overloada.
a. If Ttube ≤ 126°F, the unit will return to its original operation
state.
b. If Ttube ≥ 131°F, frequency rise is not allowed.
c. If Ttube ≥ 136°F, the compressor will run at reduced frequency.
d. If Ttube ≥ 144°F, the compressor will stop and the indoor fan
will run at preset speed.
2) Heating overload
a. If Ttube ≤ 126°F, the unit will return to its original operation
state.
b. If Ttube ≥ 131°F, frequency rise is not allowed.
c. If Ttube ≥ 136°F, the compressor will run at reduced frequency.
d. If Ttube ≥ 144°F,the compressor will stop and the indoor fan will
blow residue heat and then stop.
② Exhaust temperature protection of compressor
If exhaust temperature ≥ 208°F, frequency is not allowed to rise.
If exhaust temperature ≥ 217°F, the compressor will run at
reduced frequency.
If exhaust temperature ≥ 230°F, the compressor will stop.
If exhaust temperature ≤ 194°F, the compressor has stayed at stop
for at least 3 minutes, the compressor will resume itsoperation.
③ Communication fault
If the unit fails to receive correct signals for durative 3 minutes,
communication fault can be justified and the whole system will
stop.
④ Module protection
Under module protection mode, the compressor will stop.
When the compressor remains at stop for at least 3 minutes,
thecompressor will resume its operation. If module protection
occurs six times in succession, the compressor will not be
startedagain.
⑤ Overload protection
If temperature sensed by the overload sensor is over 239°F, the
compressor will stop and the outdoor fan will stop with atime lag of
30 seconds. If temperature is below 203°F, the overload protection
will be relieved.
If voltage on the DC bus is below 150V or over 420V, the
compressor will stop and the outdoor fan will stop with a timelag
of 30 seconds. When voltage on the DC bus returns to its normal
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