water as low as 40
0
F.
Improper air sensor location. Check your specific control troubleshooting section,
Digital display is
not lit.
4-pin display cable plugs are not making contact
(unplugged, dirty, bent, or broken pins).
With POWER OFF at the circuit breaker, remove
connector and inspect. If damaged, replace connector or
entire display cable.
Maintenance
Reversing Valves
Reverse cycle units have a reversing valve; the valve must be energized periodically to keep the internal parts
moving freely. To do this, switch the air conditioning unit into heat mode 2-3 cycles per month.
Seawater Strainer
Ensure that your pump receives adequate seawater flow by regularly (daily in extreme cases) cleaning the strainer
basket. Periodically check the overboard discharge for a steady stream of water. Check seawater intake speed
scoop for obstructions. Make sure hoses are not looped, kinked or crushed. Check and clean strainer as needed
weekly - minimum once per month.
Condenser Coil Cleaning (Seawater Acid Flush)
1. With the system turned off at the circuit breaker on the ship's panel, disconnect the inlet and outlet
connections of the condenser coil.
2. Use chemical resistant hoses (PVC 3/4" I.D. or 5/8” I.D. as required, etc.) to connect the inlet of the
condenser coil to the outlet of a chemical resistant, submersible pump and let the hose connected to the
Coil outlet flow freely into the container mentioned below.
3. Place a strainer or piece of screen over the inlet of the pump and submerse the pump into a container filled
with a 5% solution of muriatic or hydrochloric acid and fresh water or use a premixed over-the-counter
solution. Use a large container as possible to hold the solution (5-25 gallons). CAUTION: avoid spilling or
splashing the solution. Remember to wear all necessary protective gear, i.e. approved safety goggles and
chemical resistant gloves. Follow all warnings and recommendations given by the manufacturer of any
acids or premixed solutions.
4. Power the pump and circulate the solution through the condenser coil for 15-45 minutes depending upon
the size of the coils and the extent of the contamination. Visual inspection of the solution in the container
should indicate when the contamination has been removed.
5. Circulate fresh water through the coil to flush any residual acid from the system.
6. Restart the system and check operational parameters to ensure thorough cleaning has taken place.
Additional cleaning may be necessary with extreme contamination.
7. Minimum once per year or as needed.
For the purpose of protecting the environment, dispose of any contaminated acid solutions in
accordance with federal, state and/or local regulations.
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