Haier AC142ACNAC, Service Manual

Page: 42 / 91

9.1 Control Features
The brief introduction includes those for each item of various types of air conditioners and
their electric control functions. The brief introduction includes those for each item of various types of air conditioners and
their electric control functions.
7.1 Brief introduction of electric control 7.1 Brief introduction of electric control
(1) Automatic run
(1) Automatic run
a. Cooling-heating type
After the machine being started and running mode changes to AUTO, the system will
decide running mode according to difference between the present room temperature and
setting temperature, then runs as the decided mode. In the following selections, Tr means
room temperature and Ts means setting temperature.
Select running mode according to the following conditions at the first time to enter Auto
mode:
Tr Ts-3 to select cooling mode (with setting temperature being Ts +3)
Tr<Ts-3 to select heating mode (with setting temperature being Ts)
After the system entering auto run mode, the running mode can convert automatically
according to variation of room temperature between cooling, blowing and heating in the way
shown as the chart below:
R
o
o
m
t
e
m
p
e
r
a
t
u
r
e
f
a
n
g
l
l
i
Cooling Ts+3
Cooling
Roo
m
tem
perature rising
Blowing
Ts-3
Ts-3
Heating
b. Single Cooling Type
Select running mode according to the following conditions at the first time to enter Auto
mode:
Tr Ts + 3 to select cooling mode
Tr < Ts + 3 to select blowing mode
After the system entering auto run, the running mode can convert automatically
according to variation of room temperature between cooling and blowing functions in the way
shown as the chart below:
R
o
o
m
t
e
m
p
e
r
a
t
u
r
e
a
l
l
f
i
n
g
Cooling
Ts+3
Roo
m
tem
perature rising
Blowing
Cooling
Blowing
Ts-3
9
ELECTRICAL CONTROL FUNCTIONS
ELECTRICAL CONTROL FUNCTIONS