SMB Air Conditioner
12 VDC Owner’s Manual 9/09
Page 4 of 13
unchecked, equipment damage. Should the strainer become clogged or partially obstructed, adverse
performance will be experienced. The first indication will be a reduction in the quantity of the discharge
water. Eventually , the high pressure switch in the unit will activate and shut the unit down. (See
Troubleshooting.) Turn the power off to the unit; check strainer and pump, restart. (See Pump and
Troubleshooting.)
To eliminate these potential problems, it is recommended that you check to make sure you have water
flow each time you turn the system on and clean your strainer weekly. More often as conditions dictate.
In some regions, it is common to experience a tremendous presence of jellyfish or sea nettles
concentrated in back bay marinas for short periods of time. These can clog strainers and water pumps
every hour to hour and a half in some cases. In such severe conditions, seek the advice of your local
factory service representative. They will be most familiar with solutions to localized situations. Marvair
works closely with our servicing dealers when custom solutions are required. During the warranty
period, factory approval must be obtained for any modification to be done to alleviate the problem
without voiding warranty coverage.
Sea Water Pump
Your seawater pump has been sized in accordance with specifications for system water flow and
volume. A minimum of 1.5 GPM (5.69 LPM) measured at the inlet to the air conditioner of water flow
is required for proper operation
.
The pump is a self priming.
Occasionally, sea grass, jellyfish and other items may pass through your strainer and get lodged in the
pump impeller. Should cleaning your strainer fail to eliminate a water flow problem, you should next
check the pump. First loosen the discharge line and gently remove it from the pump assembly. (Make
sure the seacock is open.) Water should rise above the pump to a level equal to the waterline of your
boat. If not, there is a blockage.
