Midea HD-Y388 Instructions Manual

Page 1

Set-point Range: 5°C to 35°C(Adaptable)

Display Accuracy: ± 1°C

Switch Current Rating: < 3A

Sensing Element : NTC

Display: Large Screen LCD

Power Supply: 220VAC ±15% 50/60 Hz

Dimensions: 86 × 86 × 13.5 mm

Housing: Flame Retarding PC

SPECIFICATIONS

WIRING DIAGRAMS

1. The thermostat is flush mount, a back box of ideally 45mm depth should be sunk into the wall prior to installation.

2. Installation should be carried out by a qualified electrician.

3. Choose a location about 5 feet(1.5 meter) above the floor with good air circulation.

4. To avoid electrical shock and to prevent damage to the furnace, air conditioner, and thermostat, disconnect the
power supply before beginning work. This can be done at the fuse box, at the circuit breaker, or at the appliance.

MOUNTING

See overleaf for further operating instructions

HD-Y3 8B
to control fan coil only

1

2

3

4

5

6

7

8

FC

L

L(Phase,220VAC)

N(Neutral,220VAC)

LOW

MED

HI

N

HD-Y3 8DA/DB
to control fan coil with 3-wire
motorised valve

1

2

3

4

5

6

7

8

FC

L

L(Phase,220VAC)

N(Neutral,220VAC)

LOW

MED

HI

N

3-wire valve

HD-Y3 8DA/DB
to control fan coil with 2-wire
motorised valve

1

2

3

4

5

6

7

8

FC

L

L(Phase,220VAC)

N(Neutral,220VAC)

LOW

2-wire valve

MED

HI

N

HD-Y3 8F
to control 2-position damper actuator

HD-Y3 8F

to control 0 30 60 90 damper actuator

1

2

3

4

5

6

7

8

air
damper
actuator

L

L(Phase,220VAC)

N(Neutral,220VAC)

N

0

30

60

90

1

2

3

4

5

6

7

8

L

L(Phase,220VAC)

open

close

N(Neutral,220VAC)

N

air
damper
actuator

HD-Y3 8S
to control

4-pipe fan coil with 3-wire

motorised valve

1

2

3

4

5

6

7

8

FC

L

L(Phase,220VAC)

N(Neutral,220VAC)

LOW

MED

HI

N

3-wire valve

9

3-wire valve

8

8

8

8

8

8

Room Thermostat HD-Y388

Page 2

TO ADJUST THE FAN SPEED

With each press of the “fan speed key” “ ” , the
themostat will change the speed among high,medium,
low and auto speed. When the thermostat is turned
on, the default fan speed is medium speed.

When in auto fan speed mode , the fan speed will be
displayed on screen along with the auto symbol.

STAND BY STATE

When the thermostat is first connected to power, the
thermostat will be in stand by state, the LCD displays
RT with current room temperature.

TO TURN THE THERMOSTAT ON/OFF

To turn the thermostat on, press “

”.

To turn the thermostat off, press “

” again.

When the thermostat is turned on, the LCD displays:

1. ST(set temperature, this is the temperature the
thermostat is currently controlling to)

2. RT(room temperature, this is actual room temp)

3. operating mode, for example:

heating mode, with icon“ ”

cooling mode, with icon“ ”

4. fan speed display status, for example,

temperature is 3 C above the set temperature;
Medium speed if 2 C above the set temperature;
Low speed if 1 C above the set temperature.

COOLING MODE

°

°

Also in cooling mode, if the fan speed is set to auto,
the fan coil will run in high speed if the actual room

In cooling mode, an icon“ ”will display on the LCD.

°

is 3 C below the set temperature;

Also in heating mode, when the fan speed is set to
auto, the fan coil will run in high speed if the actual
room temperature

below the set temperature;

HEATING MODE

°

°

In heating mode, “ ”will display on the LCD.

°

Medium speed if 2 C

Low speed if 1 C below the set temperature.

Press button for 5 seconds to
lock the key board.

KEY BOARD LOCK

Press button for 5 seconds
to unlock the key board.

HEATING MODE/COOLING MODE

Press or

to select heating or cooling mode

TO ADJUST THE SET ROOM TEMPERATURE

Press any other button to accept or automatically

accecpt after 5 seconds of inactivity.

Press up or down key to set the desired temp.