j) After you have removed all 115 (220) vac electrical power, the electrical box cover
may be removed by removing the three retaining screws on each side of the box. Once
the screws are removed the cover will slide off the box.
k) Closely check the box for loose or disconnected wires. If all wiring is tight and in
place, replace the transformer. A new transformer may be purchased from your nearest
Mermaid dealer, refrigeration supply store or direct from the Mermaid factory.
2. Standard 24v Thermostat In COOL Position - Fan Runs - Compressor Does Not:
a) 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. Check water pump for prime and motor operation, check raw water
strainer for clogging and hoses for kinks. Fix water problem and turn thermostat back
on.
b) If water pump is operational and HIGH PRESSURE switch has not activated, perform
thermostat jumper test described in paragraph 1h) above. If unit operates, replace
thermostat batteries and/or thermostat.
3. Compressor Runs - Fan Does Not:
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. Replace the fan relay or capacitor
with the recommended from the factory. Before opening the electrical box, all 115 (220)
power must be removed from the boat. See the above Note and WARNING under
paragraph 1i) regarding opening the electrical box.
4. No Water Out:
a) Put thermostat in OFF position.
b) Check that sea cock is open. If closed, open and prime pump.
c) Check raw water strainer. If dirty, clean and prime pump.
d) Check that pump is running. If pump is faulty, replace and prime.
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