Hunter 49, Operator'S Manual

Page: 120 / 196

Hunter 50 • Water Systems
9.4
9.3 Pumps
On board your boat there are both fresh water and raw
water pumps that control the flow of water to the related
components. These are electrically powered pumps .
Some of the features of these pumps are:
•Smooth Flow
• Self-Priming up to 10 feet (3m)
• Dry running capability
• Soft noise absorbing mounts
• Snap-fit port fittings
• Built-in bypass — less pulsation
• Reduces need for accumulator tank
• Corrosion resistant materials
Remember to read your OEM manuals for complete informa-
tion, as well as safety warnings, or notices.
9.3.1 Fresh Water Pump
The fresh water pump supplies water to the system
under pressure when the potable water supply is not
connected.
The FRESH WATER PUMP breaker switch is on the DC
side of the MDP. When the breaker is switched to ON,
the pumps will run until the hot and cold water systems
are pressurized. An automatic pressure switch shuts the
pumps off until the pressure drops to a preset level (for
example, a pressure drop caused by opening a faucet).
The pumps will then run again until the system is pressur-
ized and turn itself off. The pumps have a build-in check
valve to prevent backflow through the pumps.
The fresh water washdown connection is located on the
transom.
Important: Operate the fresh water pumps only when there
is water in the tank. Running the pumps dry will damage the
diaphragm.
Note: If the pumps run from time to time even though no water
is being used, a leak in a water line is a likely cause. Check all
lines for leaks and repair immediately.
9.3.2 A/C Cooling Pump
Your boat may be equipped with the optional air condi-
tioner reverse cycle unit. This type of unit can heat or
cool your boat.
The Air Conditioning system is made up of a pickup valve
(or thru hull) (See Underwater Gear for its location), a sea
strainer, an A/C cooling pump, and the major compres-
sors and air handlers.
To find the A/C cooling pumps’ location refer to the
arrangement illustration at the end of this chapter or the
Mechanical Arrangement at the end of the Boating Safety
Chapter.
The A/C cooling pump receives sea water from the pick-
up strainer and pumps it through the A/C compressor to
cool the compressor.
See the AC Electric Section for an explanation of the
electrical controls of this system.
9.3.4.1 To operate the air conditioner:
1. Open the air conditioner seacock. The valve is open
when its handle is in line with the hose. The seacock is
located to the port side of the Lazarette area, aft of the
A/C pump, in the bilge.
2. Check the strainer. Clean if necessary to assure a
steady flow of water to the unit.
3. Set the thermostat to the temperature desired.
Important: Be sure to close air conditioner seacock
when the air conditioner is not in use. Refer to the man-
ufacturer’s owner’s manual furnished with the air con-
ditioner for more information regarding its operation.
9.3.3 Toilet water supply
The toilet aboard your boat is supplied with flushing water
from the fresh water system.
More information concerning the operation and main-
Fig 9.3