How It Works Q3 & Qht Controls for Direct Expansion Systems Operations Manual
2 L-2516 ENGLISH
In Heat Mode, the opposite is true. As the seawater gets colder, there is less heat available, and the heating efficiency is
reduced. Full heating capacity is obtained at approximately 55°F (13°C) seawater temperature. Performance drops to about
50% of rated capacity in 40°F (4.4°C) water. Below this, the system pressure can be so low that the unit will shut down on low-
pressure fault. This problem is compounded when the cabin is also cold. See “FAULT AND ERROR MESSAGES” on page 15.
POWER INTERRUPTIONS
The control board has built-in protection against sudden power interruptions. The system automatically stores the current
operating configuration in permanent memory every time any changes are made. When AC power is lost, the control board
retains these settings and resumes using them when AC power is restored.
WARNING
Do not operate your air conditioning unit in water that is colder than 38°F (3.3°C). Doing so could lead to water freezing
in the condenser coil which can cause damage to the unit.
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