Hydrotab Air Unit II Installation Manual
Marine Engineering
Model: AIR UNIT II
NMEA 2000, NMEA 0183 Compatible
Disclaimer
The interceptor units are also steering equipment and it is the sole responsibility of the navigator-operator to ensure that, at any point, any problem that will alter the boat's course, rising from malfunction of interceptors, should be dealt immediately by the operator. At no circumstances, fault of our interceptor equipment leading to any kind of accident, creates liability for the manufacturer.
Trademark Notice
Hydrotab is a registered trademark of Olympic Engineering Ltd, Greece. All other trademarks, trade names or company names referenced herein are used for identification only and are property of their respective owners.
Patent Notice
The Hydrotab products are protected by patents and industrial design patents, patents pending or design patents pending.
Declaration of Conformity
This product conforms to the following Electromagnetic Compatibility (EMC) regulations and standards for use in marine environments. CE EN 60945
Technical Information and Documentation
The technical information provided in this document was accurate and correct at the corresponding production time of the Hydrotab interceptors. Our operating principal for improving the manufactured product, may lead to changes regarding its specifications without prior notice. Liability will not be accepted for any inaccuracy considering the product and the user manual.
Fair Use Statement
This manual can be printed or copied for your own use only. Copies should not be provided to third parties and manual should not be commercialized.
Product Disposal
Waste removal of this product must be according to the Waste Electrical and Electronic Equipment (WEEE) Directive.
Product Registration
Please register your product online in order the warranty to be valid.
Interceptor Installation (Indirect Air Supply)
In case of indirect air supply, you can use the components included in the kit as shown in the image.
Diagram Description: Image shows an interceptor unit mounted on a transom. A separate diagram illustrates the air unit installation on a wall, with required spacing of 15-20 cm from surrounding elements for proper cooling and ventilation. A warning states: "DO NOT MOUNT the Air Unit upside-down".
WARNING: THE AIR UNIT MUST BE INSTALLED IN A COMPARTMENT FREE OF EXPLOSIVE OR FLAMMABLE GASES.
PLEASE INSURE THAT THE AIR UNIT IS INSTALLED ACCORDING TO THE IP30 LIMITATIONS.
Installation Step 1: Caution: Exhaust must have proper spacing, to ensure correct cooling of air unit. This involves drilling holes (Ø3.5 mm) and mounting the unit using a screwdriver and provided 4.8x25 screws.
Installation Step 2: Shows the Air Unit being mounted, with a screwdriver and the unit itself.
Air Unit Installation
Mounting Requirements: Ensure 15-20 cm clearance around the Air Unit for proper ventilation. Do not mount the unit upside-down.
WARNING: THE AIR UNIT MUST BE INSTALLED IN A COMPARTMENT FREE OF EXPLOSIVE OR FLAMMABLE GASES.
PLEASE INSURE THAT THE AIR UNIT IS INSTALLED ACCORDING TO THE IP30 LIMITATIONS.
Installation Steps:
- Caution: Exhaust must have proper spacing, to ensure correct cooling of air unit. Drill holes (Ø3.5 mm) and use a screwdriver to mount the unit with the provided 4.8x25 screws.
- Shows the Air Unit being mounted.
Pneumatic Connection
Step 4: After installing the hose through the transom, mount the air fitting into the hose.
Step 5: Cut the 8mm pipe to the proper length and connect it to the Air Unit using the push-in fitting.
Diagram Description: Shows the pneumatic connections, including cutting the 8mm pipe and connecting it to the Air Unit via a push-in fitting.
Technical Data & Dimensions
Diagram Description: Shows the Air Unit with dimensions labeled A, B, and C.
| Dimension | Value |
|---|---|
| A | 355 mm |
| B | 117 mm |
| C | 327 mm |
Air Unit II DataSheet
| Specification | Value |
|---|---|
| Compressor power | 250 W |
| Air compressor type | Brushless, oil-free |
| Voltage | 24 V |
| Amps | 11 A |
| In Line Fuse | 30 A |
| Max pressure | 4 bar |
Installation Diagrams
Direct Installation Diagram - Air Unit II
Diagram Description: Illustrates the direct wiring of the Air Unit II to a Moby Controller and an optional Flybridge Controller. It shows connections to a 20A fuse, inline terminator, and uses specific cables (e.g., CABLE 10m - FF, CABLE 3m - F).
Note: In case a new NMEA 2000 instrument is added, a proper NMEA Network must be built.
Installation diagram on existing NMEA Network
Diagram Description: Shows how to integrate the Air Unit II into an existing NMEA 2000 network, connecting it to a Moby Controller and an optional Flybridge Controller. It depicts connections via existing NMEA 2000 backbone using various cable types (e.g., CABLE 3m - MF, CABLE 3m - F).
Electrical and Pneumatic Diagrams
Air Unit II Electrical Diagram
Diagram Description: This is a schematic showing the electrical connections for the Air Unit II. It includes the compressor (M), transformer (Tr1), timer, switches (DIP1-DIP4), NMEA 2000 interface (CAN-H, CAN-L), and various valve outputs (C1-C5). It specifies important switch settings: "DIP1, DIP2, DIP3, DIP4 RIGHT". It also shows power input (+/- 12/24V, Battery) and a 3A fuse (F1).
Component Key:
- C1-C5: COIL 24VDC (Valves)
- PCB: PCB-00029 (AIR-N2K)
- TIMER: ELE-00698 (ELECTRONIC DELAY)
- Compressor: PNE-01249A (COMPRESSOR 24V)
- T1: ELE-00550 (THERMISTOR)
- NMEA 2000: ELE-00535 (NMEA 5-POLE CABLE)
- F1: ELE-00701 (CYLIDRICAL FUSE 3A)
- Tr1: PNE-01249B (TRANSFORMER 24V)
Air Unit II Pneumatic Diagram
Diagram Description: This schematic illustrates the pneumatic system, showing a VALVE GROUP with individual valves (C1, C2, C3, C4, C5) and their connections to the Compressor. It visually represents the flow and control of air.
Spare Parts List
Product: AIR UNIT II (ASM-01342-RA)
Main Unit Components
| BOM ID | PartNo | Description | Qty |
|---|---|---|---|
| 1 | RUB-00163 | VENTOURI RUBBER SUPPORT | 1 |
| 2 | ELE-00577 | PROTECTION CAP | 1 |
| 3 | ELE-00644 | CABLE GLAND PG9 | 1 |
| 4 | ELE-00646 | USB SEALING CAP | 1 |
| 5 | ELE-00647 | MINI USB PORT, FEMALE | 1 |
| 6 | ELE-00698 | RELAY TIMER | 1 |
| 7 | ELE-00707A | TERMINAL BLOCK | 1 |
| 8 | GEN-00405 | COVER | 1 |
| 9 | GEN-00543 | AIR UNIT II VENTURI TUBE | 1 |
| 15 | LAS-01271 | HOLDER | 1 |
| 16 | PCB-00029 | PCB FOR NMEA 2000 | 1 |
| 29 | PNE-01249A | COMPRESSOR, 24VDC | 1 |
| 30 | PNE-01249B | TRANSFORMER | 1 |
| 31 | PNE-01249C | COMPRESSOR FILTER 1/4 | 1 |
| 32 | REV-00582 | VENTURI MANIFOLD | 1 |
| 33 | RUB-00162 | PCB RUBBER BASE | 1 |
Diagram Description: An exploded view diagram shows the physical layout of the Air Unit II components, with numbered callouts corresponding to the BOM ID.
Dimensions: A: 355 mm, B: 117 mm, C: 327 mm.
Pneumatic Fittings and Valves
| BOM ID | PartNo | Description | Qty |
|---|---|---|---|
| 18 | PNE-00072 | PLUG, MALE, PARALLEL, 1/8 | 2 |
| 19 | PNE-00073 | NIPPLE, TAPER, 1/8 (M) - 1/8 (M) | 4 |
| 20 | PNE-00092 | SAFETY VALVE, 1/8 | 1 |
| 21 | PNE-00222 | ELBOW MALE ADAPTOR 6/4-1/8 | 3 |
| 22 | PNE-00647 | SWIVEL+OR ELBOW M5-2X4 | 3 |
| 23 | PNE-00924 | COIL EVI 7/9 10W | 5 |
| 24 | PNE-00925 | THREAD OPERATOR 2/2NC | 4 |
| 26 | PNE-01113 | KNURLED NUT WITH M8 THREAD | 5 |
| 38 | PNE-01232 | Valve, 4-POSITION, 1/8 with M5 | 3 |
| 39 | PNE-01233 | Valve, 2-POSITION 1/8, 20x20x30 | 2 |
| 45 | PNE-00721 | ΡΟΔΕΛΑ ΑΛΟΥΜΙΝΙΟΥ, 1/8 | 2 |
| 46 | REV-00588 | AIR UNIT MAX & AIR UNIT II FITTING | 3 |
Diagram Description: A diagram shows various pneumatic fittings and valves with numbered callouts corresponding to the BOM ID list.
Troubleshooting
This section provides a flowchart to diagnose common issues:
- Issue: Moby Controller is ON but flaps do not operate on manual.
- Check: Do you notice N2K error and Temperature Offline?
- If Yes: Use a jumper wire between COM and LDRU, RDLU, DN, UP.
- If No: Replace air unit PCB.
- Issue: When the red lights are on, does the compressor work?
- If Yes: Check for replacement of the compressor relay and 20A fuses. If the compressor is burned, replace it.
- If No: Check if there is power supply to the air unit, if fuses are ok, and if the PCB has power supply.
- Issue: When the red lights are on, do the relevant solenoids operate?
- If Yes: NMEA Network communication failure due to cabling or PCB fault. Reset or replace fuses, check wires to PCB and transformer, or replace the transformer.
- If No: Burned solenoid or pilot.
- Issue: Do you get the relevant output?
- If Yes: Air leakage by faulty flap or air unit.
- If No: (Implied issue, likely related to previous step or general failure)
Note: The troubleshooting guide uses conditional logic (Yes/No branches) to guide the user through problem diagnosis.
Warranty Conditions
Warranty Periods:
- FW, TS, BT Series Interceptor units: 5-year warranty.
- SR Series Interceptor units: 2-year warranty.
- Recoil springs, electrical/electronic parts: 2-year warranty.
- Anodes (consumables) are not covered (for BT, FW, TS Series).
Hydrotab's warranty covers only the repair or replacement of spare parts. Fitting or shipping costs are not covered.
System Selections: The buyer is solely responsible for choosing the correct system.
Limited Warranty: Provided the system is installed correctly and without improper handling, Hydrotab will replace defective parts. Hydrotab decides whether to repair or replace.
Extended Limited Warranty: Available for systems installed as original equipment on new boats or purchased through a Hydrotab dealer. Requires online registration within 30 days of purchase. Valid for 3 years from shipping date. URL: https://www.hydrotab.gr/product-registration
Dealer Responsibility: Dealers must provide serial numbers for separate unit sales and guide end-users for registration.
Service Requirements: Original invoice is required for warranty service. Replaced parts must be returned for inspection; otherwise, warranty is not valid.
User Responsibility: Costs of dismantling, assembly, and transportation are borne by the user.
What is not covered by the warranty:
- Damage from lack/non-replacement of anodes.
- Damage from improper installation or use.
- Damage from misuse or external causes (visible deformation).
- Damage from non-authorized personnel during transport, installation, or repair.
- Conversions or modifications after sale.
Company Liability: N. Triantafyllis Ltd (Hydrotab Marine Engineering) is not liable for incidental, indirect, or consequential damages (e.g., travel expenses, loss of income, property damage, loss of profits, personal injury) beyond the product itself. Dealer commitments do not create company liability.
Contact Information
Company: Hydrotab Marine Engineering (N. Triantafyllis Ltd)
Address: 4, Papazoglou str., GR-17778 Athens, Greece
Email: info@hydrotab.gr
Website: www.hydrotab.gr
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