CTM Marine Self-Contained CT Installation & User Manual
14
Seawater System
Refer to the drawings below for an overview of how the seawater system
should look like:
Consider the following instructions when setting up the seawater system
of your air conditioning unit. Failure to follow this procedure will void the
warranty:
1. Place a clam-shell type thru-hull fitting as far away from the water line
as possible. Slots should be directed towards the bow to obtain positive
pressure in the suction line.
2. Place a bronze seacock on the thru-hull fitting.
3. Place a seawater strainer
below
the level of the pump.
4. Connect the seacock and the strainer with a reinforced marine-grade
hose.
5. The pump should be install at least 30 inches
below
the waterline,
except when a self-priming pump is used.
6. Connect the strainer and the pump with a reinforced,
marine-
grade hose.
7. Connect the pump's outflow to the coil inflow (See page 5to locate
the coil inflow) with a 5/8 inch reinforced, marine-grade hose.
8. Connect the a/c unit discharge from the coil outflow (See page 5 to
locate the coil outflow) with a 5/8 inch reinforced, marine-grade hose.
>
The a/c seawater system should
have a dedicated thru-hull fitting
for the pump.
>
The inlet for the thru-hull, seacock, hose, and
strainer should not be smaller than the pump
inlet.
>
The pump strainer assembly should be
installed with a gentle upwards slope from the
seacock to the pump.
>
Keep all the piping as short as possible
without kinks or loops where air can become
trapped.
>
Avoid 90º elbow fittings as much as possible.
>
Ensure that the pump head is rotated toward
the direction of water flow.
>
Use seal tape on all threaded connections.
>
Double-clamp all hose connections with
stainless steel clamps.
>
Connect all metallic parts in contact with
seawater to the vessel's bonding system.
Steady upward flow from inlet
to unit then downward to
outlet.
Pump may be placed
above waterline if it's
self-primed.
>
It is strongly recommended to
install an air-bleeder system both in
the suction line as well as immediately after the
discharge outlet of the pump.
1
3
4
5
6
7
8
WATER LINE
2
1
3
4
5
6
7
8
2
WATER LINE
WATER LINE
WATER LINE
1
. Thru-hull fitting
2
. Seacock
3
. Strainer
4
. Seawater Pump
5
. Coil inflow 6. A/C Unit
7
. Coil outflow 8. Seawater Outlet
CORRECT
Water
Flow
Pump and strainer must be below
waterline. Pump head must be rotated
towards the water flow.
INCORRECT
Hoses must not have kinks or
loops where air can become
trapped.
INCORRECT
Strainer must
bebelow
waterline.
INCORRECT
Pump may be placed
above waterline if it's
self-primed.
Water
Flow
1
3
4
5
6
7
8
2
1
3
4
5
6
7
8
2
