Haier 1U71S2SG1FA Service Manual page 215

Cooling Mode
o
105 C< Discharging Temp.
o
98 C< Discharging Temp.<=105
o
<=98 C
Heating Mode
o
105 C< Discharging Temp.
o
98 C< Discharging Temp.<=105
o
<=98 C
4-way Valve Control in Heating
Unitary: 50s later after compressor start up, the 4-way valve start to operate. When compressor stops or unit is not
in heating mode, the 4-way valve is closed after compressor stop for 2 minutes and 55s.
compressor
4-way valve
Multi: Protection when 4-way valve can not reverse in heating: 15 minutes later after compressor startup, if
indoor coil average temp. is below 5degree and keeps for 1 minute, the unit will stop and occur the 4-way valve
protection.
compressor
4-way valve
Electric Heater Control
If compressor has not run for a long time, the refrigerant will deposit on the bottom of compressor and mix with the
refrigeranr oil. When re-startup, because low pressure reduces, refrigerant will be segregated from the refrigerant
oil and cause soam in the oil, which will make compressor exhaust a lot of oil. Therefore please stop heating the
compressor bottom to ensure the low pressure in startup period should not go down greatly.
• Ambient temp. TA≤32degree, when compressor stops, the electric heater will be electrified.
• When TA≥32degree, or compressor running, the electric heater will be off.
+50degree/60seconds, it Will Stop Until Up to the Max. Permitted Opening
Angle
o
C Keep the Angle
5degree/60seconds, and Reduce to 0 Degree Gradually
Indoor Modification Angle
10degree/60seconds, it Will Stop Until Up to the Max. Permitted Opening
Angle
o
C Keep the angle
5degree/60seconds, and Reduce to 0 Degree Gradually
ON
OFF
ON
OFF
50 S（E ）
ON
OFF
ON
OFF
50 S（E）
Heater ON
OFF
Ambient temp. TA( ℃ )
Indoor Modification Angle
27 32
212
2 minutes and 55s
2 minutes and 55s