Regal 42SC Owner's Manual page 110

Reverse Heat
Your yacht air conditioning system features a reverse heat
cycle. This can be extremely valuable to boater's in colder
climates especially for early spring and late fall cruising.
To accomplish reverse cycle heating, the R-22 refrigerant
flows in the opposite direction through a reversing
valve located on the evaporator/condenser unit. Heat is
transferred from the seawater in the coil of the condenser
to the R-22 refrigerant and then to the air as it is blown
through the evaporator to the cabin.
Obviously, the temperature of the seawater will effect the
air conditioner effi ciency.
The temperature variance for cooling effi ciency is:
Up to 90 Degrees F. ( 32.2 Degrees C. )
The temperature variance for heating effi ciency is:
Down to 40 Degrees F. ( 4.4 Degrees C. )
Typical Air Conditioning System Operation
Below is a basic quick start-up checklist for the air
conditioning system. For more in depth information,
refer to the vendor operation manual found in the
owner's documentation folder located in the port aft set
of drawers in the aft master stateroom cabinet.
Operations Quick Start-Up Checklist:
1. Check the AC seawater strainer for debris.
2. Make sure the AC seawater pump seacock located in
the engine room is opened completely (handle should be
in-line with the hose).
3. Depending which air conditioning unit you desire to use
(forward, aft, cockpit) activate that breaker on the yacht's
main AC control panel located in the starboard aft salon
overhead cabinet.
4. Activate the air conditioner pump breaker located at the
ship's main AC control panel.
5. Check the port hull side for a steady stream of seawater.
Seeing water here is normal when the forward/aft AC
pumps are running. See illustration. If stream is diminished
or no water emits from the fi tting immediately turn the
AC pump off and investigate the cause of the problem. If
optional cockpit air is installed check the starboard transom
thru-hull fi ttings for a steady water stream.
5. Press the Elite thermostat Power button once to activate
the air conditioning system. A blank screen displays when
system is off and indicates present cabin temperature.
6. For cooling or heating press and release the Mode button
until the desired LED is illuminated ie; automatic mode.
7. Press the Up or Down button to set the desired cabin
temperature. To view the set point, momentarily press and
release the Up or Down button.
8. Auto fan LED lights when Auto fan speed is selected.
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Systems