Mermaid REFRIGERATION FREEZER User Manual

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

[e-mail]

TABLE OF CONTENTS

SECTION 1

A. Introduction to Mermaid

(OVERVIEW)

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 Protection
F. Module Overheat
G. Alarm Indicators

SECTION 5 (EVAPORATORS)

A. Location
B. Installation
C. Thermostat Sensing Tube
D. Mounting

SECTION 6 (THERMOSTATS)

A. Refrigerator/Freezer Thermostats

B. Mounting
C. Operation

SECTION 7 (QUICK CONNECT REFRIGERANT CONNECTIONS)

A. Note
B. Connection The Quick Connect Fittings

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 Runs, Box Temperature Too Low
F. Excessive Frost Build Up

SECTION 1

(OVERVIEW)

A. Introduction:

Congratulations!! You have just purchased one the most dependable Marine
Refrigeration/Freezer units available on the market today, a MERMAID.

Mermaid supplies pleasure boat owners, custom boat builders, yacht brokers, boat dealers
and marinas around the world with their marine air conditioning, refrigeration, and
dehumidification needs.

Mermaid refrigeration/freezer systems are manufactured to the highest of quality
standards using only top of the line components and materials assembled by long-term
technicians. All of our refrigeration/freezer units are modularized, self contained, pre­wired, pre-charged and mounted on a solid foundation of stainless steel. All electrical
parts are standard refrigeration components and are available across the entire country,
and around the world.

As you will come to find, Mermaid Marine takes great pride in the products and services
they provide to their customers. Mermaid believes there is no such thing as enough
customer service and, in today’s market, this is a must! Whether you purchased

Mermaid’s 12/24VDC model or our 12/24VDC & 110V with Auto Change-Over model,
we are sure you will be pleased with their performance.

Mermaid provides a one-year warranty on the refrigeration/freezer products and a five­year warranty on their marine air conditioning line. In the unlikely event of any issue,
Mermaid will take the necessary steps to ensure your complete satisfaction.

Thank you for the business and we look forward to hearing of your success!

Regards,

John D. Trotter

Vice President

SECTION 2

(CONDENSER INSTALLATION)

A: Mounting Position:

These units should be mounted in a cabinet or area where they will not be susceptible to
physical or water damage. There should be adequate ventilation of the compartment to
allow the warm air to be expelled, but not so that it can be immediately drawn back in.
The efficiency of the system depends mainly on the temperature of the air entering the
condenser. Re-circulating the heated air back into the condenser in a sealed or poorly
ventilated cabinet will result in poor system performance, as will drawing in air from a
heated space, i.e. engine room.

B: Installation

These units are designed to be mounted on a surface where adequate ventilation can pass
around the unit. This can either be from an adjacent cabinet or a custom “return air”
grille no smaller than a 6” x 6” grill.

Mount the unit by securing with screws through the base, making sure that the condenser
lines up with the ventilation hole. Best results are achieved with the unit if the condenser
frame is sealed against the bulkhead with foam rubber tape or equivalent. The ventilation
hole should be covered with a suitable grill to protect the condenser fins from damage, &
for aesthetic appeal. The grill must be of sufficient size & construction so as not to
impede air flow.

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 from the vessels batteries into alternating
current to run the compressor. Never attempt to run the compressor directly from the
batteries or other power source.

B: 12/24VDC, 12/24VDC & 110V w/ Auto Change-Over

A supply voltage of either 12 or 24 volts dc is required, & the Module will run from
either without any special settings or adjustments, switching to 24v mode if the voltage is
above 17v. The Mermaid unit is also available in 12/24v & 110v with Auto Change­Over. Should this be your model, the unit will automatically detect either 110v or
12/24v. The unit will run on the stronger of the two power sources. Should 12/24v be
available and 110v is introduced (via shore power or generator) the unit with
automatically switch to this power source. If 110v is lost, the unit will wait 60 seconds
before automatically switching back to 12 or 24 volts dc.

SECTION 4

(SAFEGUARDS)

Protection from the following is provided

A: Low Voltage:

To prevent the batteries from being totally discharged, the compressor will be stopped if
the voltage
start until the voltage rises above 11.7 (24.0) volts.

B: High Voltage:

If the voltage exceeds 17v, the Module stops the compressor & switches into 24v mode,
but will not attempt to start the compressor until the voltage reaches 24v.

at the terminals on the Module falls below 10.6 volts (23.4), & will not re-

C: Compressor Non-Start:

If the compressor does not start, the Module will stop the starting process, & attempt a re­start 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 terminals exceeds 0.7 amps 12v dc, the compressor will
be stopped & a re-start attempted every 60 seconds.

F: Module Overheat:

If the heat sink on the module exceeds a preset temperature, the compressor will be
stopped & will be re-started when normal operating temperatures are resumed.

G: 4 Alarm Indicator:

A LED may be installed across the + & D terminals of the Module to indicate a failure
condition as follows:

LCD will “Blink” up to 5 times every 5 seconds.

1 Blink; Supply voltage low, below 10.4v (22.8)

2 Blinks; Excessive load on fan terminals, above 1.0 amps

3 Blinks; Compressor non-start – Refrigerant pressure too high

4 Blinks; Compressor speed below 1850 RPM

5 Blinks; Module heat-sink temp too high. Re-sets on cool-down. IE: Module too hot.

NOTE ONE

After power is applied to the Module there may be a delay of up to 60 seconds before the
compressor starts

.