# Functions And Control - Haier 1U71SABFRA Service Manual

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## 7. Functions and Control

7.1 Main functions and control specification
7.1.1 The operation frequency of outdoor unit and its control
7.1.1.1 The operation frequency control of compressor
The operation frequency scope of compressor
Mode
Minimun operation frequency
H
e
t a
n i
g
2
0
H
R
e
r f
g i
r e
t a
o i
n
2
0
7.1.1.2 The starting of compressor
When the compressor is started for the first time, it must be kept under the conditions of 58Hz,88Hz for
one minute (the overheating protection of the outdoor unit air-blowing temperature, immediately decrease the
frequency when the compressor is overflowing and releasing the pressure) then it can be operated towards
the target frequency. When the machine runs normally, there's no such process. After starting the
compressor for operation, the compressor should run according to the calculated frequency, and every
determined frequency for protection should be prior to the calculated frequency.
7.1.1.3 The speeds of increasing or decreasing the frequency of the compressor
The speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/second
The speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds
7.1.1.4 The calculation of the compressor's frequency
1
The minimum/maximum frequency limitation
A While refrigerating:
IN
is the minimum operation frequency of the compressor.
B While heating:
is the minimum operation frequency of the compressor.
1
The frequency limitation which is affected by the environment temperature.
Heating mode:
Serial No.
1
2
3
4
5
6
7
8
Remarks: the above are the maximum frequency limitations of the complete appliance which are affected by
the environment, and they have nothing to do with the ability of the indoor unit.
Refrigeration/dehumidification mode::
Serial No.
1
1
1
z
H
z
is the maximum operation frequency of the compressor;
is the maximum operation frequency of the compressor;
Temperature scope
Wh_c<-12
W
h
c _
<
8 -
W
h
_
c
<
2 -
W
h
c _
<
5
W
h
_
c
<
1
0
W
h
_
c
<
1
7
W
h
_
c
<
2
0
Wh_c
20
Temperature scope
W
h
_
c
<
1
6
W
h
_
c
<
2
2
W
h
_
c
<
2
8
Maximun operation frequency
1 1
8
H
z
9
0
H
z
Frequency limitation
Max_hz8
117 HZ
M
a
x
_
h
z
7
1 1
7
H
Z
M
a
x
_
h
z
4
1 1
7
H
Z
M
a
x
_
h
z
5
9
9
H
Z
M
a
x
_
h
z
1
9
0
H
Z
M
a
x
_
h
z
2
72
H
Z
M
a
x
_
h
z
2
6
2
H
Z
Max_hz6
45 HZ
Frequency limitation
M
a
x
_
h
z
1
3
8
H
Z
M
a
x
_
h
z
1
4
4
H
Z
M
a
x
_
h
z
1
5
5
H
Z
15
Functions and control
IN
Domestic air conditioner

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