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Table of Contents
Troubleshooting
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Summary of Contents for Mermaid Air Conditioner
- Page 1 MERMAID MARINE AIR CONDITIONING INSTALLATION & OPERATIONS GUIDE Mermaid Manufacturing of Southwest Florida, Inc. 2651 Park Windsor Drive, Suite 203 Fort Myers, FL 33901 (239) 418-0535 (800) 330-3553 Fax (239) 418-0538 E-mail: MMair@Mindspring.com Web site: http://www.mmair.com...
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Page 2: Table Of Contents
TABLE OF CONTENTS SECTION 1 (OVERVIEW) A. Introduction to Mermaid SECTION 2 (INSTALLATION and OPERATION) A. Air Conditioner Installation B. Operation SECTION 3 (OPERATION and PROGRAMMING) A. Digital, Programmable Thermostat SECTION 4 (PUMP RELAY BOX) A. Introduction B. Installation SECTION 5 (MAINTENANCE and WINTERIZATION) A. - Page 3 Any four wire 24Volt digital thermostat will operate any standard Mermaid air conditioner. Don’t forget to see our NEW flush mount digital controller on our website – www.mmair.com.
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Page 4: Air Conditioner Installation
A. AIR CONDITIONER INSTALLATION: First, and of foremost importance, the air conditioner and electrical box must be installed in a non-explosive, dry environment. SEE THE FOLLOWING WARNING. IF THE AIR CONDITIONER OR ELECTRICAL BOX ARE PLACED IN AN EXPLOSIVE ENVIRONMENT OR EXPOSED TO AN EXPLOSIVE... - Page 5 24,000 17 Inches The air conditioner needs to be mounted in an area where it will physically fit, as well as accommodate a properly sized return air grill and any ducting or splitters (Wyes) which would be attached to the air output collar. In addition, you need to insure there is space for the water hoses to be connected.
- Page 6 Water is then routed to the air conditioner from the pump via 5/8 inch marine water hose (also known as ½” I.D. hose) where it is connected to the air conditioner condensing coil's "water in"...
- Page 7 SMALL PILOT HOLE FIRST WHICH CAN BE EASILY SEALED IF If you are using a sea cock assembly furnished by Mermaid, we recommend that a 1-1/16 inch hole saw be used to make this hole. If you are using a sea cock purchased elsewhere, you must use the appropriate hole saw for that specific sea cock.
- Page 8 IMPORTANT FAILURE TO SEAL A “CORDED” HULL MAY RESULT IN SERIOUS DAMAGE TO THE BOAT’S STRUCTURE. Note: The threads on the foot scoop end about 3/8 of an inch from the actual foot scoop. If after drilling the hole for the foot scoop you discover that your hull is thinner than 3/8 inch, you will need to reinforce the hull with a 6”...
- Page 9 The Water Strainer: If you are using a Mermaid furnished water strainer, it will come with (2) 3/4 inch thread to hose barb hose fittings. Attach these fittings to the strainer using an ample amount of marine sealant on the threads. Again, if you are using a Mermaid strainer, locate the strainer mounting bracket.
- Page 10 To install the bleed off valve, attach a short length of blue tracer hose to the water-out on the pump and secure the bleed off valve on the other end of the hose. Attach the blue tracer hose that you are running up to the air conditioner unit to the other end of the bleed IMPORTANT REMOVED FOR SERVICE.
- Page 11 1-1/16 inches so the same hole saw used for the "water in" sea cock can be used. Typically the "water out" thru-hull will be mounted close to the air conditioner to eliminate the extra work of having to route the water hose in difficult places.
- Page 12 This power is obtained from the master 115 vac Circuit Breaker Panel in the boat. Power is routed from this panel to the air conditioner. The air conditioner will then supply power to the pump as required.
- Page 13 Regardless of the btu size of the air conditioner, at least one vent must be within 4 to 5 feet of the unit. Insure though, that the airflow is not directed back towards the return air grill. In the case of the 16,500 btu unit, the largest grill is required to be the closest grill.
- Page 14 It is important that the same volume of air being forced into the cabin is allowed to return to the air conditioner. As long as the physical opening of the return air grill is at least the minimum size specified below for your specific air conditioner, the actual shape of the grill is not important.
- Page 15 7. Condensation Removal: Depending on the btu rating of your unit and the actual run time, the air conditioner will remove from one to five gallons of water (condensation) from the air in a 24 hour period.
- Page 16 Predrill the holes before screwing to the wall. (Exact vertical mounting is necessary only for appearance). 4. Route the thermostat power cable, out of view, back to the air conditioner compartment. Secure the cable at appropriate spots along the way to prevent sagging or looping so it will not be inadvertently snagged by stowed equipment.
- Page 17 DETERMINING THAT ALL REQUIREMENTS CAN BE MET WHEN UNIT IS SECURED. Position the air conditioner unit so "water in" and "water out" hoses can be attached without kinking. Now check the air splitter and ducting for fit. Make sure that all ducting bends are as slight as possible to keep air restriction to a minimum.
- Page 18 MAKE SURE THAT ALL AC POWER TO THE BOAT HAS BEEN DISCONNECTED. FAILURE TO REMOVE ALL BOAT AC POWER COULD RESULT IN ELECTRICAL SHOCK CAUSING SERIOUS INJURY OR DEATH. Determine which power cable is from the pump (16 gauge cable) and strip the outside insulation back about six inches.
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Page 19: System Operation
"Bleed Off" valve when opened, the pump is not below the water line of the boat and must be remounted. 2. Power: a) With the air conditioner circuit breaker in the "OFF" position connect the dock power cord back to the boat. - Page 20 The Air Conditioner Unit: The unit should be free of vibration noises and the sides of the evaporator should be sweating and cool all the way up. If vibration noise is present, adjust the unit mounting screws.
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Page 21: Introduction
The thermostat comes with a 20 foot power cable. One end of the cable attaches to the BLACK terminal board on the side of the air conditioner electrical box. The other end is wired into the black teminal board inside the thermostat itself. (Directions listed below.) The thermostat may be mounted on any flat wall surface with space behind the wall to run the power cable out of view and still reach the air conditioner electrical box. - Page 22 Predrill the holes before screwing to the wall. (Exact vertical mounting is necessary only for appearance). 9. Route the thermostat power cable, out of view, back to the air conditioner compartment. Secure the cable at appropriate spots along the way to prevent sagging or looping so it will not be inadvertently snagged by stowed equipment.
- Page 23 For immediate comfort, when the system switch is moved to the COOL or HEAT position, simply press the TEMP Down or Up key until your air conditioner turns on to the desired set temperature. It is advisable depress the HOLD button as this point.
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Page 24: Installation
Only one air conditioner can be allowed to apply power to the pump at any give time to preclude a doubling of power on the pump. The relay switching box will recognize the first air unit providing power to the pump. -
Page 25: Maintenance
GROUND located on the side of the relay box. 4. On the first air conditioner, locate the terminal block marked PUMP. Run a 16 gauge boat cable from here to the terminal block marked B W on the pump relay box. Strip all wires back ¼”... -
Page 26: Winterization
The debris that would normally be collected by the filter will become lodged in the evaporator coil cooling fins and will gradually reduce the efficiency and performance of your air conditioner to a point that it will require professional acid bath cleaning. -
Page 27: (Theory Of Operation And Trouble Shooting)
RESULT IN FLOODING CAUSING SIGNIFICANT WATER DAMAGE OR SINKING OF THE BOAT. b) The condensing coil, the coil that connects to cooling "water in" and cooling "water out", must be clear of any standing or trapped water. The best way to clear this coil is to remove the "water in"... -
Page 28: Theory Of Operation
All Mermaid air conditioners have always been charged with HCFC-22 (R22), similar to your home air conditioner or refrigerator. CFC-12 (R12) has never been used in Mermaid air conditioners. It is unlawful for any technician who is not EPA certified as at least a Type1. - Page 29 This power is distributed to various components inside the electrical box including a 115/220 vac to 24 vac reduction transformer. The thermostat utilizes the 24 volts to activate the appropriate relays inside the electrical box which, when energized, apply 115 or 220 vac power to the blower, compressor and water pump.
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Page 30: Trouble Shooting
The water pump is controlled by the electrical box and will be turned on and off with the air conditioner compressor. When the pump is operational, it forces the cooling water through the "double fluted" air conditioner condensing coil "inner chamber,"... - Page 31 Place thermostat in the OFF position. Locate the HIGH PRESSURE switch mounted on the top of the air conditioner unit. Check if the red button is active or extended. If the pin is extended, push it in. This switch shuts power off to the compressor when cooling water is insufficient to make the required heat exchange as described in Theory Of Operation above.
- Page 32 a) Place thermostat in the OFF position. Use a shorting wire as described in paragraph 1h above, except this time short the "RED" wire to the "GREEN" wire. If fan comes on, thermostat is faulty. b) If fan does not come on when jumper is applied, it is most likely a faulty fan relay inside the electrical box or an external fan capacitor.
- Page 33 Drain pan nipple on pan clogged. Clean nipple. b) Drain hose clogged, misaligned or kinked. Fix and/or clear hose. c) Air conditioner not properly elevated to drain water to drain pan nipple. Check unit mounting to insure water will flow to nipple.
- Page 34 ISSUE. SHOULD IT BE NECESSARY, WE MAY HAVE TO HAVE THE UNIT RETURNED TO THE FACTORY. PRIOR TO REMOVAL OF THE AIR CONDITIONER, INSURE YOUR SEA COCK IS CLOSED. AFTER DISCONNECTING THE HOSES FROM THE UNIT, USING A BARB TO BARB HOSE CONNECTOR, CONNECT THE TWO ENDS OF THE HOSE TO EACH OTHER TO PRECLUDE ANY WATER ENTERING THE BOAT.
- Page 35 YOU HAVE TWO CHOICES AFTER PACKAGING THE UNIT, IDENTIFYING IT AND SEALING THE BOX UP. AS YOU UNDERSTAND FROM THE WARRANTY, IT IS YOUR RESPONSIBILITY TO PAY FOR FREIGHT TO GET THE UNIT BACK TO THE FACTORY (IF THE UNIT IS MORE THAN 6 MONTHS OLD). UPON OUR DETERMINATION OF NEEDING THE UNIT BACK AT THE FACTORY, WE WILL OFFER YOU TWO CHOICES FOR HANDLING THE SHIPMENT BACK TO OUR FACTORY.
- Page 36 YOU. UPON YOUR APPROVAL, WE WILL REFURBISH THE UNIT TO AT LEAST, ORIGINAL FACTORY SPECIFICATIONS. FROM TIME TO TIME, WE CHANGE VENDORS, PARTS, ETC. TO CONTINUOSLY IMPROVE THE RELIABILITY OF OUR PRODUCT. WHEN YOUR UNIT IS RETURNED, COSMETIC ASPECTS OF YOUR UNIT MAY BE DIFFERENT, BUT WE GUARANTEE THAT IT MEETS OR EXCEEDS ORIGINAL FACTORY SPECIFICATIONS.
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