Marine Packaged Air Conditioner SCU CLD: Installation & Operation Guide

A marine packaged air conditioner is a cooling device that directly cools the air inside the chamber, featuring a new design, convenient operation, stable performance, safety, reliability, and easy maintenance. One key advantage of the SCU CLD marine packaged air conditioner is its ability to deliver efficient cooling performance and long-term value for vessel owners.

It is widely used for passenger ships, cargo ships, navies, and offshore platforms. This product is designed to meet the needs of a wide range of customers, ensuring high levels of customer satisfaction through reliable operation and tailored solutions.

The company also offers a range of marine air conditioning products to meet the diverse requirements of various vessels.

Introduction to the SCU CLD

The SCU CLD is a state-of-the-art self-contained marine air conditioner designed to deliver reliable cooling and heating for boats and yachts of all sizes. Built with high-quality components and a compact footprint, this marine air conditioner is ideal for installation in tight cabins or deck spaces where efficiency and space-saving are essential. The SCU CLD uses eco-friendly refrigerants, making it an environmentally responsible choice for marine air conditioning. Its quiet operation ensures a peaceful onboard experience, while the robust design guarantees long-lasting comfort and performance. Whether you’re outfitting a new vessel or upgrading your current system, the SCU CLD provides a quality solution for maintaining optimal air temperature and comfort in marine environments.

Key Features

The SCU CLD marine air conditioner stands out in the market of self-contained units thanks to its advanced features and user-friendly design. It is equipped with a high-performance heat pump system, allowing for both efficient cooling and heating in a single unit. The digital control panel offers precise temperature management and easy operation, giving users full control over their cabin environment. Its compact design simplifies installation, making it suitable for a wide range of boats and yachts. The quiet rotary compressor and high-speed blower ensure powerful yet silent ventilation, maintaining comfort without disturbing the peace onboard. With these innovative components and a sleek, space-saving design, the SCU CLD is the ideal solution for those seeking top-tier marine air conditioning.

Air Conditioners in Marine Applications

Marine air conditioners are essential for ensuring comfort and air quality on boats and yachts, especially during long journeys or in extreme climates. Self-contained units like the SCU CLD are particularly valued in marine applications for their ease of installation and straightforward maintenance. These air conditioners are engineered to withstand the unique challenges of the marine environment, featuring corrosion-resistant materials and waterproof components to ensure durability and longevity. Whether you need to cool a small cabin or a larger area, marine air conditioners are designed to keep the onboard environment comfortable and pleasant. With a variety of models and features available, it’s easy to find a marine air conditioner that fits your vessel’s requirements and provides reliable performance season after season.

Air Conditioning System Design

Designing an effective marine air conditioning system involves careful planning and consideration of your vessel’s specific needs. Start by calculating the required cooling capacity based on the size of your cabin and the number of occupants. Next, choose the type of unit that best suits your application—self-contained units like the SCU CLD are often preferred for their simplicity and efficiency. Proper installation is crucial, including the strategic placement of vents and components to ensure even air distribution and easy access for maintenance. Collaborating with a professional sales and service team can help you select the right system, ensure correct installation, and provide ongoing support. A well-designed marine air conditioning system will deliver consistent comfort, energy efficiency, and reliable service for years to come.

Attention for installation

• The packaged air conditioner should be laid out according to the shipyard drawing and installed according to the operation manual by a professional.
• The air inlet and outlet should be positioned away from the barrier to ensure that the air flows through the chamber.
• The installation location should leave sufficient space for commissioning and maintenance.
• The water inlet & outlet pipes of the condenser should be connected as per the mark shown on the plant.
• The water inlet & outlet pipe should be fitted with a valve for cleaning it.
• The packaged air conditioner has a condensate water connection to ensure the water drain out thoroughly.
• The safety valve outlet should be connected with a copper tube and lead to the outside.

The checked items after installation

Items to be checked	Accidents due to improper installation
Whether the installation is firm?	The plant may have some vibration or noise.
Whether the condensate water drain out well?	The plant may have some drops and wet the floor.
Whether the voltage comply with the nameplate?	The plant may have some malfunctions or parts damaged.
Whether the water inlet & outlet pipe of condenser connects correctly?	The plant can not work or have high pressure alarm.
Whether the cables comply with the drawings?	Cables will be burnt or the plant have malfunctions.
Whether air inlet & outlet has barrier?	It wll cause insufficient cooling capacity(heating capacity)

Attentions of operation

Confirm the power supply wire is connected firmly, otherwise it will cause electric shock or fire, don't damage the wire or use other type cable.

Ground: ground reliably, earth wire should be connected to the special ground device onboard.

When istall the packaged air conditioner, there have bolt holes on top of backside to fix the top. 

Don't put your fingers or bar into air outlet of indoor unit, otherwise it will damage the AC or personnel injury.

Regulae the setting temperature to proper value. 

Don't pour the water to AC or flush it by water, otherwise it will result in malfunction or cause electric shock. 

Notice for operation

• Cooling mode  When cooling, the compressor runs, the fan also runs, indoor ventilates, AHU will absorb the inside heat and reduce the ambient temperature.
• Heating mode   The fan runs, electric heating will work, indoor ventilates, Packaged air conditioner releases the heat and increases the ambient temperature.
• Anti cold air:    Under"heating" mode, the fan will not start immediately, it will blow out heat air after one minute of preheating. 
• Unmormal working conditions of Packaged air conditioner 
  • "Auto"mode, indoor temperature is beyond 24℃, AC will auto begin to cool, when indoor temperature is lower than 24℃, AC will auto begin to heat. 
  • "Cooling" mode, indoor temperature is lower than 18℃, it will not cool.
  • When humidity is above 80%(door and window open), it continues to cool, air outlet will have dew drops.
  • Start/stop instructions of compressor
• To prolong the compressor life, computer board will auto control the start/stop of compressor, it will appear when ambient temperature reaches to setting value, it will stop with time delay. When protection shutdown appears, compressor will start with 3min delay even the malfunctions are reset.

Components name

1 compressor
2 condenser
3 expansion valve
4 evaporator
5 liquid charge vavle
6 drier filter
7 high & low pressure controller
8 temp sensor
9 control panel
10 air outlet
11 terminal box
12 Condenser water inlet & outlet flange connection
13 air inlet & filter mesh

Operation method of PAC

First  Provide the power supply

Open the terminal box

Close the air switch.

Second Operation of control panel

Press On/Off switch to select "ventilation" mode and fan will run.

Press On/Off switch to select "cooling" mode and fan will run. Regulate temp▲▼ switch, set temp is 24℃, compressor will run and blow out the cold air.

Press On/Off switch to select "heating" mode. Regulate temp▲▼ switch, set temp is 28℃,wait for 1min, fan will run and blow out the hot air.

Press "swing" switch to change the direction of air outlet.

Press "speed" switch to change the air speed.

Maintenance

1 How to check the system leak?

The needed materials and tools: the bottled nitrogen, relief valve, 3 long ¢6 copper tube, DN4 copper joint flare expand tool, spanner, soap water, sprinkling can and screwdriver.Disassemble the panel of air inlet ,fill the soap water into sprinkling can, one end of copper tube is welded to relief valve,the other end is sleeved with DN4 copper joint, then expand the flare, mount the relief valve on the nitrogen bottle, open the liquid valve, balance the high & low pressure gauge to 1.5MPa, then stop pressing, close the nitrogen bottle valve and liquid valve. Use sprinkling can to aim at the connection of copper tube and check one by one, the leak place will have some bubbles, repair it.

2 How to vacuum?

The needed material and tools: vacuum pump, liquid pipe, spanner and screwdriver.
Disassemble the panel of air inlet, screw off the plastic cap of liquid valve and cock of DN4 copper joint, connect the liquid pipe: one end is connected to liquid valve, the other end is connected to suction of vacuum pump, open all stop valves of the system, open the vacuum pump, then close the liquid valve till reaches to 720mmHg, close the pump.

3 How to add the refrigerant?

The needed material and tools: bottled refrigerant, liquid pipe, special valve spanner for cooling, short jumper and screwdriver
Disassemble the panel of air inlet, screw off the plastic cap of liquid valve and cock of DN4 copper joint, connect the liquid pipe: one end is connected to the refrigerant bottle, the other end is connected to liquid valve and tight it. Upside down the refrigerant bottle, remove the plastic cover of high & low pressure controller, short connect two terminals inside the controller, start it in cooling mode, when compressor is running, the pressure of low pressure gauge will be low, open the liquid valve, the liquid refrigerant will enter into the system, the charge capacity is different due to different models, please refer to the following:

4 How to adjust the expansion valve, clean the expansion valve filter mesh and change the expansion valve?The needed material and tools: screwdriver and spanner
Disassemble the panel of the air inlet, screw off the cap of the expansion valve, when seeing the flow adjust nut, use spanner or cross screwdriver to adjust, in clockwise, the flow will be reduced, in counter-clockwise, the flow will be increase.

Clean the expansion valve filter mesh

The needed material and tools: screwdriver, spanner, hex spanner, vacuum pump, liquid pipe and short jumper
Disassemble the panel of air inlet, screw off the plastic cover of high & low pressure controller, short connect the two terminals of controller, close the outlet valve of condenser, select cooling mode, compressor will run, when low pressure gauge indicates 0.01Mpa, it will shutdown and cut off the power. Use spanner to disassemble the nut at inlet of expansion valve, separate the copper tube and expansion valve, now you can see that the filter mesh is inserted at the inlet of expansion valve, draw out the filter mesh and clean it. Reinstall it after cleaned. Open the liquid valve, connect the liquid pipe and vacuum pump, start the pump, when low pressure gauge reduces to , then close the liquid valve, open the outlet valve of condenser. Use the soap water to check the disassembled connections to check the leak.

Change the expansion valve

The needed material and tools: new expansion valve, screwdriver, spanner, hex spanner, vacuum pump, liquid valve and short jumper
Disassemble the panel of air inlet, screw off the plastic cover of high & low pressure controller, short connect the two terminals of controller, close the outlet valve of condenser, select cooling mode, compressor will run, when low pressure gauge indicates 0.01Mpa, it will shutdown and cut off the power. Use spanner to disassemble the nut at inlet and outlet of expansion valve, or use hex spanner to loose off four screws on expansion valve base, pay attention not to damage the cushion inside the expansion valve when changing, the temp bulb should be installed to previous location, after changed, recover all the connections, open the liquid valve, connect the liquid pipe and vacuum pump, start the pump, when low pressure gauge reduces to , then close the liquid valve, open the outlet valve of condenser. Use the soap water to check the disassembled connections to check the leak.

5 How to change the control screen and computer board?The needed material and tools: the new control screen, computer board and screwdriver
Cut off the power supply, disassemble the panel of air inlet and outlet, cover of electric box, the control screen is on the panel of air inlet, draw out the signal wire of control screen from the electric box, disclose the rubber insulation on the rear of the air inlet panel, screw off the screws on the cover of control screen, you will see the control screen, change it and recover them. Pull off all plugs on the computer board, remove the four fixed screws on it, change the new one and then recover the plugs as per the previous order.

6 How to change the electric heating superheat protector?

The needed materials and tools: screwdriver
Disassemble the panel of air inlet and outlet, and decoration strips on both sides of the air conditioner casing, on the bottom of the electric heater have two screws to connect with the frame, screw them off, draw out the fan and electric heater integrally, then change the new superheat protector.

7 Compressor run pressure and protection pressure

The air conditioning system can select different refrigerants, which have different working pressures and protection pressure.Operation method of remote controllerPut the battery on the remote controller, aim it at the connection of far infrared ray of control panel, regulate the function of AC as per the requirements.
MaintenanceCleanAfter AC is put into the run, clean the condenser 2-3 times every year.Clean method: stop the cooling water pump, close the water inlet & outlet valve, screw off the water drain valve of condenser to discharge all water, use wrench to loose all the bolts on both sides of condenser to remove the cover, then you can see a copper tube, use soft brush to stretch into the tube and drag back and forth to clean it. When reinstall, pay attention to the direction of cover and cushion, wrong installation will make AC not work or high pressure alarm.When AC is not used, close the water inlet & outlet valve of condenser to drain the cooling water inside the condenser to prevent the freeze broken.Filter mesh at air inlet should be cleaned in schedul, too much dust on the mesh will reduce the air flow and result in sufficient cooling(heating) capacity.Clean method:disassemble the air inlet panel of AC, use dust colletor to aim at the filter mesh, open the dust collector, reset it after cleaned.Rust proof After AC is run for a time, the unit will have some rust, customer should be cleaned frequently, repair the damaged paint. Maintenance method: use sand paper to polish the rusted place, use the same paint to repair.Malfunction removalMalfunction: open-air switch, the control panel has no display. Removal: disassemble the fixing screw of the terminal box and open it, measure the voltage of terminals L1, L2 and L3 with a multimeter, if it is zero, the power should be supplied by switchboard onboard, if it is normal, the power may have wrong phase sequence, over-voltage, under-voltage, lack phase, then disassemble the air inlet panel, baffle of the electric box, check the LED lamp on power monitor, if phase sequence is wrong, exchange the wiring of L1 and L2, if the voltage is over or under, the ship should provide the working voltage, which is ±10％of rated one, if phase lack, check cables are good or not.Removal:cut off the power, disassemble air inlet panel, baffle of electric box, screw off the cover of fuse, measure the fuse resistance with multimeter, if it is zero, fuse is good, if the resistance is infinite, fuse is bad, change new one.After AC is run for a time, the unit will have some rust, customer should be cleaned frequently, repair the damaged paint. Maintenance method: use sand paper to polish the rusted place, use the same paint to repair.Malfunction removalMalfunction:Malfunction: control panel display the malfunction code and can not cool.

Malfunction: after start up, control panel display normal, in "cooling" mode, but it still does not cool.

Malfunction: after start up, control panel display normal, in "cooling" mode, but it still does not cool.Malfunction: after start-up, control panel displays normal, in "heating" mode, but it still does not heat.

Malfunction	Checked item	Remark
Temp is not set improperly.	Set temp should be higher than the ambient temp	Rise the set temp
Overheat protection	heater has overheat protector, when temp is over70℃, it will force to stop

Heat Pump System

The SCU CLD marine air conditioner features an advanced heat pump system, offering both cooling and heating functions in one compact unit. Utilizing eco-friendly refrigerants, this system is designed for maximum efficiency and minimal environmental impact. The heat pump allows you to seamlessly switch between cooling and heating modes, ensuring your cabin remains comfortable regardless of outside conditions. This versatility makes the SCU CLD an excellent choice for boat owners who sail in varying climates and want to maintain optimal comfort year-round. With its innovative design and reliable performance, the SCU CLD’s heat pump system provides a practical and sustainable solution for marine air conditioning needs, making it easy to enjoy your time on the water in any season.