Temperature Compensation; Anti-Cold Air Operation; Correction Of Overheat Value; Correction Of Discharging Temperature - Haier H-MRV Series Service Manual

Fan speed adjustment by hand: when unit is running, you can set High/Med/Low/Auto speed due to
request.

3.4 Temperature compensation

In 5 minutes of first startup(or cancel temp. compensation for the first time), 4℃ temp. compensation is
cancelled. When out of factory, the compensation is set at installation.
The others are as the same as that of cooling mode.

3.5 Anti-cold air operation

When the temperature reaches one value, fan motor is low speed, and rises over one value, you can set
the fan speed; while when the temperature lowers one value, fan motor is low speed, and lowers another
value, fan motor stops.
1) When beginning heating mode, if indoor liquid pipe temperature is below a certain temperature,
indoor fan motor will stop; if indoor liuiqd pipe temperature is over a certain temperature, fan motor
will be in low speed.
2) If indoor liquid pipe temperature can not be over a certain temperature, fan motor will not run. If indoor
liquid pipe temperature can be over a certain temperature, fan motor will run at set speed.
4. EEV control
4.1 General control: After the unit is powered on, EEV will make full close and full open action, then be
at full close standby state.
When thermostat is ON, and the unit starts up after defrost, EEV will be at base open angle.
The base angle when thermostat is ON for first time: cooling: 200 pulse, heating: 350 pulse.
4.2 In cooling, modify the base open angle according to the indoor coil temp., and discharging
temp.

4.2.1 Correction of Overheat value

The function can work in 4 minutes after starting up in cooling, including startup of the protective stop.
The adjustment interval depends on the compressor running frequency, as below:
Frequency(Hz)
Interval (s)

4.2.2 Correction of discharging temperature

The function can work in 4 minutes after starting up in cooling, including startup of the protective stop.
4.3 In heating mode, the base open angle depends on the pipe temperature conformity
The indoor EEV open angle depends on the temperature difference between the liquid pipe temperature
in heating and the average indoor liquid pipe temperature.
5. Electric control functions
5.1 Fan operation
Indoor fan motor will run at the fan speed set on the wired controller, meanwhile sends stop signal to
outdoor unit.
5.2 Timer function
You can set the 12-hour Timer ON/OFF as your need, the min. time unit is 10 minutes. After setting the
timer, the timer lamp on the unit is on; when timer is over, the timer lamp is off, there are the following
timer states:
Timer ON: Power LED, OFF; Run LED, OFF; Timer LED, On and at stop state. When timer is over,
the fan begins running and the timer LED is OFF. The operation begins from receiving the timer signal for
the first time.
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