Rotenso ANERU Series, Service Manual

Page: 347 / 552

 Product Features 8 
3.4.4 Condenser Temperature Protection
When the condenser temperature exceeds a configured
value, the compressor ceases operation.
3.4.5 Evaporator Temperature Protection
• Off: Compressor stops.
• Decrease: Decrease the running frequency to the lower
level per 1 minute.
• Hold: Keep the current frequency.
• Resume: No limitation for frequency.
3.5 Heating Mode(Heat Pump Units)
3.5.1 Compressor Control
1) Reach the configured temperature
• If the following conditions are satisfied, the
compressor ceases operation.
• Calculated frequency(fb) is less than minimum limit
frequency(FminH).
• Compressor runs at FminH more than 10 minutes.
• T1 is higher than or equal to Tsc+ HDIFTEMP2.
Note: HDIFTEMP2 is EEPROM setting parameter. It is 2°C
usually.
• If one of the following conditions is satisfied, not
judge protective time.
• Compressor running frequency is more than test
frequency.
• Compressor running frequency is equal to test
frequency, T4 is more than 15°C or T4 fault.
• Change setting temperature.
• High or sleep function on/off.
2) When the current is higher than the predefined safe
value, surge protection is activated, causing the
compressor to cease operations.
3.5.2 Indoor Fan Control:
1) In heating mode, the indoor fan operates continuously.
The fan speed can be set to 1%-100%,or low,
medium, high and auto.
• Anti-cold air function
• The indoor fan is controlled by the indoor
temperature T1 and indoor unit coil temperature
T2.
Case 1:
T1
≥
19°C ( 66.2°F )
Δ
TE1=0
15°C ( 59°F )
≤
T1
<
19°C ( 66.2°F )
Δ
TE1=19°C
-
T1
( 34.2°F-T1 )
T1<15°C
(
59°F
)
Δ TE1=4°C
(
7.2°F
)
Case 2: Δ
TE1=0
2) Auto fan action in heating mode:
• Rise curve
• When T1-Tsc is higher than -1.5°C, fan speed
reduces to 80%(High);
• When T1-Tsc is higher than 0°C, fan speed reduces
to 60%(Medium);
• When T1-Tsc is higher than 0.5°C, fan speed
reduces to 40%(Low);
• When T1-Tsc is higher than 1°C, fan speed reduces
to 20%(Low);.