Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

21 PB
OPERATION
Function and Control
Advanced Functions
1) DIP Switch Function [after reprogramming, disconnect the power cord and wait 2 minites for the electronic
components (capacitors/resistors) to cool down or bleed off. Then power up again to make changes effective]
1 Reserved
2 Heat pump
ON- valid; OFF-invalid
3 E-heater
ON- valid; OFF-invalid
4 Reserved
5 Room freeze protection
ON- valid; OFF- invalid
6 Auto-restart
ON- valid; OFF- invalid
7 Reserved
8 Reserved
CAUTION
SW2 DIP switch must be matched with the unit capacity, otherwise the compressor will
fail to operate correctly. Do not change dip switches on SW2!
Advanced Settings
Under OFF mode, hold [COOL] and [HIGH] two keys at the same time continuously for 5 seconds. ‘d0’ will be dis
played, indicating that the system has entered the advanced operation status.
[COOL] key is used to switch parameter code and parameter value;
[+] or [-] keys are used to switch parameter code or set parameter value;
[ON/OFF] key is used to save and exit settings.
Menu NO. Function "Parameter value" Explanation
do Unit of temperature F Fahrenheit (default)
C Celsius
dl Control master p By control panel or IR remote thermostat(default)
r By 24V universal remote thermostat
rE By12V smart wired controller
rF VRPXEMRT2 and VRPXEMWRT2
d2 Max temperature setting d3 to 90°F The Min value is d2 (default 90°F)
d3 Min temperature setting 60°F to d2 The Max value is d3 (default 90°F)
d4 Indoor temperature
calibration
-9°C to 9°C If unit of temperature is changed, calibration
should be done again. If using the default value, it
can be ignored. (default 0°C/O°F)
-9°F to 9°F
d5 Temperature display
selection
O o r 1 0-displays room temperature (default ),
1-displaysset point.