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Mermaid REFRIGERATION/FREEZER manual

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Table of contents for the manual

  • Page 1

    KOOL-TEMP ™ MARINE REFRIGERATION/FREEZER UNITS INSTALLATION INSTRUCTIONS AND OWNER’S MANUAL PRODUCED BY: MERMAID MANUFACTURING OF S.W., FL, INC. 2651 PARK WINDSOR DRIVE SUITE 203 FORT MYERS, FL 33901 800-330-3553 239-418-0535 – P 239-418-0538 – F INFO@MMAIR.COM[...]

  • Page 2

    TABLE OF CONTENTS SECTION 1 (OVERVIEW) A. Introduction to Mermaid SECTION 2 (INSTALLATION) A. Mounting Position B. Installation SECTION 3 (CONTROL MODULE) A. Electronic Control Module B. 12/24VDC, 12/24VDC & 110V w/ Auto-Changeover SECTION 4 (SAFEGUARDS) A. Low Voltage B. High Voltage C. Compressor Non-Start D. Compressor Speed Too Low E. Fan P[...]

  • Page 3

    SECTION 8 (ELECTRICAL) A. Power Supply B. Wire Size C. Overload Protection D. Connections, Power E. Connections, Thermostat F. Connections, Fan SECTION 9 (TROUBLESHOOTING GUIDE) A. Note B. Compressor Not Running, No Start Attempt C. Compressor Attempts To Start, Or Starts And Stops Shortly After D. System Runs, Box Temperature Too High E. System Ru[...]

  • Page 4

    Mermaid’s 12/24VDC model or our 12/24VDC & 110V with Auto Change-Over m odel, we are sure you will be pleased with their performance. Mermaid provides a one-year warranty on the refrigeration/freezer products and a five- year warranty on their marine air conditioning li n e. In the un likely event of any issue, Mermaid will take the necessary[...]

  • Page 5

    SECTION 3 (CONTROL MODULE) A: Electronic Control Module: The Electronic Control Module is an integral part of the Danfoss BD35/50F compressor system. It transforms direct current power f rom the vessels batteries into alternating current to run the compressor. Never a ttemp t to run the com pressor directly from the batteries or other power source.[...]

  • Page 6

    C: Compressor Non-Start: If the compressor does not start, the Module will stop the star ting process, & attem pt a re- start every 60 seconds. D: Compressor Speed Too Low: If the compressor speed falls below 1900 RPM the Module will stop the compressor. E: Fan Protection: If the current draw across the fan terminal s exceeds 0.7 amps 12v dc, t[...]

  • Page 7

    NOTE TWO The Electronic Module, although designed for harsh & marine applications, can be damaged from either direct or incidental c ontact with water, & by water f lowing down wires attached to the terminals. W hen att aching wires to the terminals on the Mod ule, make sure that all wires a pproach from below the term in al, & endeavor[...]

  • Page 8

    C: Thermostat Sensing Tube: Check to see where you need to a ttach the thermostat sensing tube before mounting the evaporator. The capillary tube (silver capill ary tube) coming off the thermostat is the sensing device. Upon delivery, the sensing t ube will be coiled up near the body of the thermostat. The entire unit – includ ing the dial – ma[...]

  • Page 9

    contact with any electr ical component either inside or outside the ice-box. If the sensing tube needs to be bent within the confines of th e refrigerator or freezer box, it must be done with great care, heeding the warnings above. C: Operation: The thermostat knob is m arked from 1 to 7. Th e coldest setting is 7, & from this position the knob[...]

  • Page 10

    together, they allow the refrigerant to flow through the system without leaking out to the atmosphere. If needed, they can be undone to enable a faulty component to be rem oved & replaced without leaking refrigerant. Never run the compressor unless all component s of the system are connected together. B: Connecting the Quick Connect Fittings: L[...]

  • Page 11

    B: Wire Size: Consult ABYC tables for 3% volt drop. Never use less than 10 gauge wire. C: Overload Protection: Use either a breaker or fast-b low fuse with 15 amp rating for a 12/24v supply, and/or a 8 amp fuse for the 110v a/c side. (These items are provided on new installations from the Mermaid factory). D: Connections, Power: If wiring from the [...]

  • Page 12

    (3) Run all applicable tests before assuming Module or Compressor to be faulty. B: Compressor Not Running , No Start Attempt. Probable cause Action 1 Supply voltage too low Check vo ltage with a di gital multi-m eter at the terminals on the Module. This must be 11.7v or more for a 12v supply & 24v or more for a 24v supply. Inspect power supply,[...]

  • Page 13

    connected retaining screw & then ensure tha t the 3- pin plug is seated firmly on the pins of the compressor. 9 Faulty compressor Remove the Module as above, & unplug from the compressor. Check that ohm readings are the same across all terminals of the com pressor. 10 Heat sink overheated Allow co mponents to cool down before attempting re-[...]

  • Page 14

    3 Thermostat type If you are planning to convert your ice box into a freezer, or as a spillover system, a freezer thermostat (0021) must be used. 4 Evaporator type & size If the ev aporator has an even coating of frost, the thermostat is se t on 7, & the system is cycling, the evaporator may be too small. Either replace the evaporator with [...]

  • Page 15

    E: System Runs, Box Temperature Too Low: 1 Thermostat setting Rotate thermostat knob to a lower number. 2 Thermostat type Check that you are using a refrigerator thermostat (0028) for a refrigerator application. 3 Faulty thermostat If syst em is running continuously & box temperatures are too low with thermostat set on the lowest number, first [...]

  • Page 16

    F: Excessive Frost Build-Up: Note: This is the result of moist air be ing allowed to enter the box. Problems are compounded when cold air leaks from the lower area of the box & is replaced by warm, humid air entering elsewhere. 1 Drains & holes not plugged Make sure all drains & holes in the floor & walls of the box are sealed. 2 Ci[...]

  • Page 17

    DANFOSS COMPRESSORS 12/24V AND 12/24V W/ 110V[...]

  • Page 18

    WIRING OF DANFOSS ELECTRONIC MODULE 12/24V 12/24V + 110V FOLLOW THE WIRING DIAGRA M ABOVE AND DESCRIPTION B ELOW TO MATCH WIRES. THE 12/24 + 110V MODELS WILL HAVE AN AD DITIONAL POSITIVE (L) AND NEUTRAL (N) SYMBOL FOR THE TWO 110V LEADS. MM1 AND MM2 12/24V MODELS: (-) NEGATIVE LEAD = BLACK WIRE (NEGATIVE 12/24V) (+)POSITIVE LEAD = RED WIRE (INCOMIN[...]