Compulsory

10-minute bench test, before you hang it

After unboxing, place the dehumidifier on the floor or a workbench and run a 10-minute power-on check. (The unit must be powered on for testing both before and after installation.)

1. Unbox — open the carton and lay the dehumidifier flat on the floor. Keep the packaging in case you need to return it.
2. LCD control panel — connect the LCD control panel signal cable to terminals 4-7 on the unit.
3. Temperature & humidity sensor — connect the temperature & humidity sensor to terminals 1-3 on the unit.
4. Power up — a grounded 220-240V socket can be used temporarily.
5. Switch on — the fan starts immediately; the compressor follows after a 3-second delay (make sure the unit is in dehumidification mode).
6. Force the compressor on — set the humidity target to 40% RH or lower. (If the target is above ambient RH, the compressor will not start.)
7. Run for more than 10 minutes in dehumidification mode — listen for any unusual noise from the fan or compressor. Warm air at the outlet means dehumidification is working. You can also hold the temperature & humidity sensor near the outlet — the RH shown on the LCD control panel will gradually drop. There is a metal fan inside the outlet — never put your hands or any object into it.
8. Check the LCD control panel — confirm the LCD control panel display and controls work normally, with no fault code shown.

No error code? You can start the install.

Before you start, confirm:

• Confirm the plenum height — UTC20 needs 200mm, UTC68 needs 240mm, UTC120 needs 310mm — and leave 2-30mm of clearance above and below, so the body never touches the slab or the false ceiling.
• Confirm the hanging position — mark where the four threaded rods will be fixed into the slab, avoiding existing services inside the slab.
• Pick the hatch location — a hatch of 450 × 450 mm or 600 × 600 mm is recommended, directly in front of the service-panel side (the drainage outlet side).
• Plan duct routes early — sketch the return and supply paths, mark every elbow and count them. Each 90° bend costs about 10 Pa.

Materials needed for installation

Recommended mounting components, all 304 stainless steel:

How to hang it

1. 1
   Fix four M10 stainless rods into the concrete ceiling. Use the supplied template card to mark the drill holes. Leave at least 2 cm clearance above and below the unit for levelling later.
2. 2
   Slide a rubber washer onto each rod and clamp it above and below the unit foot. The pads keep fan vibration off the slab.
3. 3
   Lift the unit onto the rods, aligning the four mounting holes at the corners.
4. 4
   Use a spirit level on the top or bottom face to confirm the unit is level.

Location & orientation — confirm before drilling

• Ceiling access hatch — must face the unit's service panel. Never face the service panel into a wall, or future maintenance is blocked.
• Return & supply air vents — at opposite ends of the body. Leave at least 0.5 m of duct-connection space at each end.
• Pump drainage outlet — below the service-panel side.
• Wired controller, power cable & emergency-stop button — located on the left of the air outlet.

Drainage requirements

1. 1
   Built-in check valve — no need to fit one externally. Prevents condensate from flowing back into the unit.
2. 2
   Fit an Upper U-trap — blocks drain-line air and odours.
3. 3
   Insulate the drain pipe — stops condensation forming on the pipe surface.
4. 4
   Use a flexible hose at the unit's drain outlet — isolates vibration from the unit to the pipe. Never connect rigid pipe directly to the outlet.
5. 5
   Shared drain line — multiple drain pipes can merge into a main drain at the low point. Never tee them at the top.

Pump cycle logic

While the unit runs, the built-in pump cycles 3 minutes on, 5 minutes off. If the drain backs up or the pump fails, the LCD shows fault code E3 (water-full protection).

Before you sign off

Slowly pour 1–2 litres of water into the drain pan through the service hatch. Power on the unit — the pump should kick in within a minute and clear the pan. Then watch every joint on the route for at least five minutes to make sure there is no chance of a leak.

• Aluminium foil flex duct is the default — easy to install and quiet. Switch to galvanised rigid for longer runs.
• Total main duct (supply + return) within 10 m. Beyond that, airflow drops as friction losses build up.
• Connect a 300–500 mm flex section at the unit's flange to stop machine vibration from travelling into the duct. Never connect rigid duct straight to the flange.
• For a quieter install, swap the 300–500 mm flex section for a silenced duct section.
• Keep 1 m of straight duct before the first branch. Avoid sharp bends right after the outlet.
• Up to 5 supply and 5 return outlets. Branch duct diameter within 75 mm.

Mounting the panel and the humidity sensor

• The control panel is 86 × 86 mm. Mount it on the wall for easy viewing and adjusting the target humidity.
• The humidity sensor can sit at the return-air vent or in a quiet ceiling corner — never in the supply airstream.

Control box — terminal map

The control box sits on the left of the unit, by the air outlet. Terminals 1–7 carry low-voltage signals from the humidity sensor and the control panel. Terminals 8–13 are passive dry-contact inputs — never apply external voltage to any terminal, it will damage the mainboard.

RS485 & WiFi

• RS485 Modbus — A/B ports behind the LCD panel, next to GND/+5V/TX/RX. 9600 bps. Standard Modbus RTU register map for BMS, HMI, PLC. Download RS485 Protocol PDF
• WiFi via Tuya Smart app — phone on 2.4 GHz WiFi (not 5 GHz). Hold the fan-speed button on the panel until the WiFi indicator flashes, then add the device from the app.

Status & Emergency Stop

• Status indicator LED + emergency stop button on the rear of the unit, next to the power cord outlet — for local diagnostics and a quick local kill switch.

Wiring

• Cable — 3 × 2.5 mm² minimum from the consumer unit to the unit's terminal block.
• Breaker — dedicated 16 A type C MCB. RCBO if local code requires it.
• Isolator — reachable from the hatch, for local lock-off during service.

10-minute power-on test

1. 1
   Energise. Confirm the LCD panel shows no fault code.
2. 2
   Set to dehumidification mode. Set the target humidity below ambient — only then will the compressor start.
3. 3
   Compressor should start within 90 seconds. A few minutes in, check that warm air is leaving the supply grille.
4. 4
   Listen below the unit and at both grilles. No metallic rattle, no abnormal duct noise.
5. 5
   After 10 minutes, the humidity reading on the LCD panel should start trending down.
6. 6
   Retest the drain. Power off, open the service panel, pour 1 L of water into the tray — the pump should cycle within 5 minutes. Check every joint along the drain line for leaks.

Hand-off

Walk the homeowner through a few things: where the filter is (and how to wash it), how the LCD panel works, and how to pair the DBA app. Leave them the manual, the order receipt, and the unit's serial number — service can help much faster with it on hand.

• Not for unsupervised children or persons with reduced physical / sensory / mental capability. Supervise children so they don't play with it.
• Only a properly grounded 220-240 V ~ 50 Hz outlet. Don't modify the plug, don't use an extension cord or an adapter — they overheat.
• Disconnect power before servicing, cleaning, or moving the unit. Unplug by gripping the plug body — never pull on the cord.
• Install per local code. Professional installation by a qualified technician is strongly recommended.
• Keep fingers and objects out of the inlet and outlet. There's a metal fan inside. Keep vents clear.
• Don't expose to flammable gas, corrosives, heavy dust, or direct water. Not for explosive or highly corrosive environments.
• Damaged power cord — must be replaced by the manufacturer, its service agent, or a similarly qualified person.
• Any abnormal sign (unusual noise, smell, smoke) — cut power immediately and call service.

Refrigerant — R410A vs R32

Your refrigerant type is on the rating label on the unit. R410A is not flammable. R32 is mildly flammable (A2L) — if your unit uses R32, observe the following:

• Qualified personnel only for installation and servicing.
• Install, operate, store in a well-ventilated area.
• Never pierce or burn the refrigerant circuit.
• Dispose of the unit per local regulations at end of life.

Package contents

• Dehumidifier — with a 5 m power cable and a Type G plug.
• Wired control panel — 8 m signal cable, fits an 86-type back box.
• Temperature & humidity sensor — 5 m cable, plugs into terminals 1–3.
• Remote controller — 2 × AAA batteries supplied.
• Installation guide — the wall-mounted marker card with all key dimensions.

Parts to know

• Air inlet & outlet — opposite short sides. Direction of airflow is printed on the top of the unit.
• Dust filter — slides out from the service-panel side. Wash regularly.
• Access panel — long face of the unit. Faces the false-ceiling access hatch.
• Pump drainage outlet — bottom, on the same side as the access panel.
• Wired controls box — small cover next to the air outlet; holds the 13-terminal block.
• Power cord outlet — rear face, next to the emergency stop button and status indicator.

Display icons

Buttons

• Power — standby ↔ run. On power-up the fan defaults to High Speed.
• Fan speed — toggles between High and Low. Indicator shows level.
• Mode (M) — cycles Dehumidify / Ventilation. Long-press 3 s to enter clock and timer setup.
• ▲ / Humidity setting — press to enter setup, then ▲ / ▼ to step the target (10 – 95 % RH). Confirms after 5 s of no input.
• ▼ / UV lamp — short-press to toggle the UV lamp on/off (if fitted).

Power on / off

• From standby: press Power → unit starts. Fan defaults to High Speed.
• While running: press Power → standby mode. Buttons and some icons turn off.
• Compressor delay: any time start conditions are met, the fan starts immediately and the compressor follows 3 s later.

Operating modes

Press the Mode button (M) to switch between dehumidify and ventilation.

• Dehumidification (default at power-up) — compressor cycles to hit your target %RH.
• Ventilation — fan only, compressor stays off. Useful for clearing stale air without drying.

Fan speed

Fan defaults to High Speed on power-up. Press the fan button to toggle between High and Low. The speed-bar indicator on the panel reflects the current level.

Clock & timer

1. 1
   Long-press Mode (M) for 3 s to enter clock setup.
2. 2
   ▲ / ▼ to set the hour, then press M to move to minutes.
3. 3
   Press M again to set the ON timer (auto power-on time).
4. 4
   Press M again to set the OFF timer (auto power-off time).
5. 5
   5 s of inactivity exits setup and saves everything.

Once configured, the unit runs the same ON/OFF schedule every day. To cancel the timer, set both ON and OFF to 00:00.

Drain pump cycle

While the unit runs, the built-in pump cycles 3 min on, 5 min off, repeating. If the drain backs up, the panel shows fault code E3 (water full).

Automatic defrost

• Enters defrost when the compressor has run continuously for 25 minutes and the coil temperature reads ≤ −1 °C for 30 s.
• During defrost the compressor stops, the fan runs at High Speed, and the panel shows the defrost icon.
• Exits defrost after 8 minutes max, or once the coil rises to ≥ 5 °C (after at least 3 minutes of defrost).
• Sensor fault (E1): the unit falls back to timed defrost — 25 min compressor / 8 min defrost.

Pairing steps

1. 1
   Install the Tuya Smart app from the App Store or Play Store and register an account.
2. 2
   Turn on phone Bluetooth and connect to your 2.4 GHz WiFi network (not 5 GHz).
3. 3
   Put the unit in pairing mode: turn it on, then press and hold the fan-speed button until the WiFi icon flashes on the panel.
4. 4
   In the app, tap "Add Device" — Tuya will discover the dehumidifier automatically.
5. 5
   Enter your WiFi name and password. The app adds the device and opens the mobile control panel.

What's covered

• 1 year from the original purchase date by the first end user, against defects in materials and workmanship under normal use.
• Manufacturer's option — repair or replace the defective product or component.
• Applies only if the unit is installed, operated, and maintained per the manual.

What's NOT covered

• Refrigerant, accessories, consumables (e.g. filters), transport, installation, removal, or labour costs.
• Damage from improper installation, operation, or maintenance, or failure to follow instructions.
• Unauthorised repair or modification, misuse, abuse.
• Environmental damage — corrosion, freezing, water ingress, acts of nature.
• Replacement parts do not extend the original warranty period.

Making a claim

• Submit within the warranty period with valid proof of purchase.
• Service is performed by the manufacturer or an authorised service provider.
• If shipping is required the customer is responsible for packaging, transport costs, and risk of loss.

Contact for service

• Hong Kong — Debiasia Green Technology (HK) Co. Ltd. · +852 2541 1611 · dba@dba.hk
• Singapore — DBA Electric Pte. Ltd. · +65 6772 9962 · dba@dba.sg

To the maximum extent permitted by law, total liability shall not exceed the original purchase price of the product. The manufacturer reserves the right to amend this warranty without notice.

RS485 & WiFi

• RS485 Modbus — A/B ports behind the LCD panel, next to GND/+5V/TX/RX. 9600 bps. Standard Modbus RTU register map for BMS, HMI, PLC. Download RS485 Protocol PDF

Fault codes