4.4 Adding Coolant

1. Cooling system is filled to proper level when shipped, with a mixture of 50% ethylene glycol and 50% distilled water. The clear tube between heat exchanger and reservoir should be filled with green coolant mixture. If level has dropped, check for evidence of leaks at all connections before adding fluid as described below. If coolant is at the correct level, skip to Section: Connecting Seawater to Heat Exchanger.

2. Mix 50% ethylene glycol with 50% distilled water in a clean container. Refer to Table 1or glycol manufacturer’s literature for freezing points.

3. Pour mixture in until level reaches below the fill neck of reservoir as shown in Figure 3. Filling reservoir above this level will not cause any damage but coolant may be expelled from pressure relief port in cap due to normal thermal expansion of coolant.
4. Connect 12 V to Seakeeper 12 VDC Input.
5. At the Display, check for any ALARMS.
6. Operate glycol pump by override on display.
   
   1. On menu bar, select the Service Page (wrench icon).
   2. Hold the wrench icon for 3 – 5 seconds to reveal the override screeen.
   3. Select “Glycol Override.”
7. Recheck glycol level with fluid circulating in coolant circuit. Ensure level above upper port in reservoir as shown in Figure 3. Replace cap.
8. Deactivate “Glycol Override.”
9. The cooling system is self-purging. If small amounts of air are in the system, they will most likely be dislodged during the first sea trial. Re-check level after sea trial and add fluid if required.

NOTE: Some air may remain in coolant (cloudy appearance).
This entrained air is acceptable and normal.