c) Electric Heat Units: When the HEAT-OFF-COOL switch is placed in the HEAT
position and the SET temperature is set above cabin ambient temperature, the thermostat
will activate the heat contactor relay and the fan relay. When the heat contactor relay is
activated, 115 vac will be applied to the heater coils through a heater thermal fuse. The
heater coils will begin to heat up. At this same instant, the fan relay is activated,
applying 115 vac to the fan which will began to run. The main contactor relay is not
activated in the electric heat mode and the compressor and pump will not run. Not
available in 220v.
d) Heat Pump Units: When the HEAT-OFF-COOL switch is placed in the HEAT
position and the SET temperature is set above cabin ambient temperature, the thermostat
will activate the fan relay and the reversing valve relay. The reversing valve relay will in
turn apply 24 vac activation power to the main contactor relay and the reversing valve
solenoid. The fan relay and main contactor relay will activate as described in paragraph
b) above. When the reversing valve solenoid is activated, a metal bar internal to the
reversing valve will be physically moved directing the system freon to flow through a
different port causing it, in effect, to flow in the opposite direction. This will cause the
evaporator to heat up as described in paragraph 2 above. (Mermaid’s FX-1 Controls
utilize a 110v or 220v reversing valve coil that is or will be provided with the use of this
control.)
4. Cooling Water:
a) Cooling water enters the boat through the foot scoop under the boat, up into the boat
through the sea cock, into the raw water strainer through the strainer and into the "water
in" port on the water pump. 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," cooling the system freon which is flowing through the condensing
coil "outer chamber". After passing through the condensing coil, the cooling water,
now warm from the heat exchange in the condensing coil, is passed overboard through
the "water out" thru-hull fitting (See FIGURE 3).
B. TROUBLE SHOOTING:
1. Standard 24v Thermostat In COOL Position - No Operation:
a) Make sure that Thermostat delay period has expired. Delay may be as long as 5
minutes.
b) Check SET temperature to make sure temperature is set below cabin temperature.
c) Once you are satisfied that the delay period has expired, check that both boat main
circuit breaker and air conditioner circuit breakers are in the ON position.
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