20
PB
Service Manual
Technical Information
20
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Mode one: Fahrenheit/Centigrade display mode
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F indicates Fahrenheit display mode
C indicates Centigrade display mode
Mode two: Adjusting mode for cooling temperature compensation value
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adjusting range of indoor ambient temperature compensation value is -6
o
F to 6
o
F(-3
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C to 3
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C) (cooling mode LED is on).
Mode three: Adjusting mode for heating temperature compensation value
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adjusting range of indoor ambient temperature compensation value is -6
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F to 6
o
F(-3
o
C to 3
o
C) (heating mode LED is on).
The compensation temperature defaults to 0 in cooling and heating mode. They can allocate different compensation temperature in cooling
and heating mode respectively.
Mode four: Display switchover between set temperature and ambient temperature in heating and cooling mode
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and cooling mode;
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heating mode and cooling mode;
F
or circumstances
below
, it will display set temperature for 10s and then turn to display ambient temperature.
ķ
Press mode button (mode button includes Cool button and Heat button)
ĸ
Energization after power failure
Ĺ
Restart the unit
ĺ
Turn on the unit after EM turns off unit
Ļ
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pressed within 30s.
5.Resetting timer
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or the protection for compressor minimum operation time, the protection time will be reduced.
6.Memory function
Energizing after power failure, the controller is running according to the mode before power failure.
The operation mode, set fan speed,
set
temperature, T value in minimum stop time of compressor, Fahrenheit/Centigrade display mode, cooling compensation temperature,
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recovers.
The unit operates in default fan mode when there is no memory. Fan speed is high with T value of zero and Fahrenheit display
mode. Cooling compensation temperature is zero and heating compensation temperature is zero. Default set temperature is 71
o
F(22
o
C).
Dual 8 displays set temperature under cooling and heating mode.
7.Restore factory settings
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compensation temperature of 0, cooling compensation temperature of 0 and displaying set temperature. T value is zero, fan speed is high
and set temperature is 71
o
F(22
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C).
8.DIP SWITCHES
Auxiliary dip switch controls are located behind front panel,through an opening below the control panel.
To access,remove front panel.
Dip
switches area
is a
ccessible without opening the control box.
Unit must be powered OFF to effectively change their status.
Factory settings
for dip switches will be in the DOWN position.
See Table 5-Dip Switch Functions for functions of each dip switch position.
Dip Switches
Dip Switches
UP
Down
Freeze guard
Setpoint Limit 1
Setpoint Limit 2
Wall Thermostat enable
Electric heat only (for Heat Pumps)
Dip switch Location on Unit
OPERATION
Function and Control
