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Functions And Control; Auto Mode; Cooling Operation Mode; Dry Mode (Dehumidifying Mode - Haier 2U18MS2VHB Service Manual

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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Auto Mode

When the running mode is turned to auto after starting the
system, the system will first determine the running mode
according to the current room temperature and then will
run according to the determined mode: Tr means room
temperature; Ts means temperature setting; Tp means
temperature of indoor coil pipe
Tr≥73°F Choose Cooling Mode
Tr<73°F
Choose Heating Mode
After turning to the auto mode, the running mode will be
switched between cooling mode, fan mode, and heating mode
according to the change of the indoor ambient temperature.
There is a 15 minute delay between mode changes.

Cooling Operation Mode

Temperature control range: 60°F---86°F
Temperature difference: ±2°F
• Control features: When Tr (input airflow)>Ts (set
temperature) °F, the indoor fan will operate at the set speed,
the mode signal will be sent to the outdoor system, and
the compressor will start. When Tr (input airflow)< Ts (set
temperature)°F, the indoor fan will operate at the set speed,
and the mode signal will be sent to the outdoor system, and
the compressor will stop. The system will keep the original
status if Tr= Ts.
Airflow speed control: (temperature difference ±2°F)
Automatic:
When Tr≤Ts +4°F high speed.
When Ts+2°F≤Tr<Ts+5°F, medium speed
When Tr<Ts+2°F, low speed
When the sensor is off, low speed
When the airflow speed has no delay from the high to low
switching, the speed should be delayed for 3 minutes (remain
at high speed for 3 minutes.) before the next switch.
When the system is operating, you can set the high, medium
or low speed manually. (When the sensor is on or off, the
system will change the speed 2 seconds after receiving the
signal.)
• Louver control: the location for the louver can be set
according to your needs.
• Defrosting function: preventing the frosting on the indoor
heat exchanger (when cooling or dehumidifying). When
the compressor works continuously for 1 to 6 minutes
(adaptable in EEPROM) and the temperature of the indoor
coils has been below 32°F for 10 seconds, the compressor
will be stopped and the malfunction will be recorded in the
malfunction list. The indoor system will continue to run.
When the temperature of the indoor coil is raised to 45°F,
the compressor will be restarted again (the requirement of 3
minutes' delay should be satisfied.)
A-6

Functions and Control

Dry Mode (Dehumidifying Mode)

• Temperature control range: 60-86°F
• Temperature difference: ±2°F
Control feature: Send the dehumidifying signal to the outdoor
system.
When Tr>Ts+4°F, the compressor will be turned on, the indoor
fan will operate at the set speed. When Tr is between the
Ts and Ts+4°F, the outdoor system will operate at the high
dehumidifying frequency for 10 minutes and then at the low
dehumidifying mode for six minutes. The indoor fan will
operate at low speed.
When Tr< Ts, the outdoor system will be stopped, the indoor
fan will be stopped for 3 minutes and then turned to the low
speed option.
All the frequency conversions have a ±2°F difference.
• Wind speed control: Automatic:
When Tr≥ Ts+ 9°F, high speed.
When Ts+5°F≤Tr< Ts+9°F, medium speed.
When Ts+4°F≤Tr< Ts+5°F, low speed.
When Tr<Ts+4°F, light speed.
If the outdoor fan is stopped, the indoor fan will be paused for
3 minutes.
If the outdoor fan is stopped for more than 3 minutes and the
outdoor system still operates, the system will be changed into
light speed mode.
When the airflow speed has no delay from the high to low
switching, the speed should be delayed for 3 minutes (remain
at high speed for 3 minutes) before the next switch.
When the sensor is off or Tr< Ts+5°F, the manual operation can
not be made (obligatory automatic operation).
• Louver location control: the location for the louver can be
set according to your needs.
• Defrosting function: preventing the frosting on the
indoor heat exchanger (when cooling or dehumidifying).
When the compressor works continuously for 16 minutes
(adaptable in EEPROM) and the temperature of the indoor
coils has been below 32°F for 10 second, the compressor
will be stopped and the malfunction will be recorded in the
malfunction list. The indoor system will continue to run.
When the temperature of the indoor coil is raised to 45°F,
the compressor will be restarted again (the requirement of 3
minutes' delay should be satisfied.)
INTRODUCTION

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