Gree GWH18TC-S3DNA1D - Page 54

51
Service Manual
Technical Information
●
Outdoor Unit
1. Compensation function of input parameters
A
ccording to the structure of wall-mounting unit, considering the comfortability for operation, indoor ambient temperature when the
compressor is at OFF st
atus is higher than set temperature under heating mode.
2. Control of detecting the availability
of parameters
For
ensuring the safety and reliability of operation, please insert the outdoor discharge temperature sensor into the corresponding
temperature
sensor bushing to make sure that the control system can detect system discharge temperature accurately. Otherwise, the
unit
will stop operation and it displays malfunction of discharge temperature sensor (discharge temperature sensor hasn’t been inserted
we
ll), which can only be resumed by pressing ON/OFF button on remote controller. Basic functions:
3. Cooling mode
3.1
Working condition and process for cooling
3.1.1 If compressor is at OFF st
atus, and ǒT
preset
-(T
indoor amb.
-T
indoor amb. compensation of cooling
Ǔ≤0ć, the unit operates in cooling mode;
3.1.2 During cooling operation, if
0ć≤ǒT
preset
-(T
indoor amb.
-T
indoor amb. compensation of cooling

Ǔ<3ć, the unit still operates in cooling mode;
3.1.3
During cooling operation, if 3ć≤ǒT
preset
-(T
indoor amb.
-T
indoor amb. compensation of cooling
Ǔ, the unit stops operation when reaching
the
temperature point in cooling.
3.2
Temperature setting range:
3.2.1 If
T
outdoor amb.
≥T
cooling temperature(low temperature)
, the temperature setting range is 16-30ć (cooling in room temperature);
3.2.2
If T
outdoor amb.
<T
cooling temperature(low temperature)
, the temperature setting range is 25-30ć. That is: the lower limit of set temperature for
outdoor unit is 25
ć.
4. Dr
y mode
4.1
Working conditioner and process for drying is same as that for cooling mode;
4.2
Temperature setting range is 16-30ć;
5. Fan mode
5.1 Compresso
r, outdoor fan and 4-way valve are all turned off;
5.2
Temperature setting range is 16-30ć.
6. Heating ode
6.1
Working conditioner and process of heating: (T
indoor amb.
is the actual temperature detected by indoor ambient temperature sensor;

T
indoor amb. compensation of heating
is indoor ambient temperature compensation during heating operation).
6.1.1
If compressor is at OFF status, and ǒT
indoor amb.
-T
indoor amb. compensation of heating
Ǔ-T
preset
Ǔ≤-1ć, the unit operates in heating mode.
6.1.2 During heating operation, if
0ć≤ǒ(T
indoor amb
.- T
indoor amb. compensation of heating
)-T
preset
Ǔ<2ć, the unit still operates in heating mode.
6.1.3
During heating mode, if 2ć≤ǒ(T
indoor amb.
- T
indoor amb. compensation of heating
)-T
preset
Ǔ, the unit stops operation when reaching the
temperature point in heating.
6.2 Under this mode, the temperature setting range is 16-30
ć.
7. Defrosting control
˄heating mode˅
7.1
If it turns to defrosting time and it detected that the defrosting temperature is satisfied for 3mins successively, the unit turns into
defrosting process.
7.2 Defrosting-starting: compressor stop
s operation and restart it up after 55s delayed,
7.3 Defrosting-ending: Compressor stop
s operation and it starts up after 55s delayed.
7.4 When an
y one of below defrosting-ending conditions is satisfied, the unit will quit from defrosting operation:
7.4.1
T
outdoor tube
≥T
quit temperature 1
for defrosting;
7.4.2 Defrosting operation time is reached
T
max.defrosting time.
8. Control of compressor
8.1Frequecny
of compressor intangibly controls the frequency according to the relation between ambient temperature and set
temperature, and the change speed of ambient temperature;
8.2 Under cooling, heating or drying mode, compressor
will be started up after outdoor fan is started for 5s.
8.3
At the OFF status, stop operation because of protection and switchover to fan mode, the compressor stops operation immediately.
8.4 Under each mode: Once the compressor is started up, it can be stopped only
after operation.
8.5 Under each mode, one the compressor is stopped, it can be restarted up only
after 3min delayed
9. Control of outdoor fan
9.1
When turn off the unit by remote controller, stop operation because of protection or stop operation after reaching the temperature
point, outdoor can stop operation only
after the compressor is stopped for 1min;
9.2 Under fan mode: outdoor fan stop
s operation.
9.3 defrosting-starting: enter into defrosting. Outdoor fan stop
s operation after compressor stops for 50s.
9.4 Defrosting-ending: quit defr
osting. When the compressor stops operation, the outdoor fan operates.
10. Control of 4-
way valve
10.1 4-
way valve status under cooling, drying and fan modes: OFF;
10.2 When the unit turned on and operated in heating
mode, the 4-way valve is energized immediately.
10.3 If turn of
f unit or switch to other mode in heating mode, the 4-way valve is de-energized after the compressor stops for 2min;
10.4 When the unit is turned off because of each protection,
the 4-way valve is de-energized after 4 mins delayed.
10.5 Defrosting-st
arting: enter into defrosting. After the compressor stops for 50s, the 4-way valve will be de-energized.
10.6 Defrosting-ending: quit defrosting.
After the compressor stops for 50s, the 4-way valve is energized.
11
. Freeze protection
11
.1 Under cooling or drying mode, if it’s detected that T
inner tube
<0 for 3min successively, the unit will stop operation due to freeze
protection. If T
limit temperature of freeze protection
<T
inner tube
, and compressor stops for 3min, the complete can resume operation;