RAW WATER ALARM

INSTALLATION INSTRUCTIONS.

SENSOR INSTALLATION.

Sensor band will fit exhaust hose in the range of 2” to 8” diameter. Locate band down stream of water injection point, leaving at least 1/8” gap between band and stainless steel hose clamps. Mount sensor on top side of hose. SEE FIGURE ONE.

Slide band through clamp. Locate adhesive backed foam bock opposite of sensor. Tension band until foam block is about ½ of it’s original thickness. Bend band over clamp and bend locking ears over band. Cut off excess banding. SEE FIGURE TWO. Use provided nylon wire ties to secure sensor cable to exhaust hose.

Insure cable will not snag moving parts such as propeller shaft or belts. Keep cable way from hot exhaust areas before water injection point.

ALARM UNIT MOUNTING AND CONNECTION.

Drill 1-7/8 TO 2” hole for mounting alarm unit. Do not attempt to remove knurled nut on face plate. Connect positive wires to switched side of ignition switch. Connect sensor to terminal block as show in drawing. Sensor wires are not polarity sensitive. Mount alarm unit with provided stainless steel screws.

OPERATIONAL TEST

Turn on ignition switch and with a section of wire, short across sensor connections. The pulsing alarm will sound and red warning light will be on.

OPTIONAL REMOTE HORN CONNECTIONS.

A remote horn may also be connected to alarm panel. Remote is useful for flybridge installations. See wire diagram . Max load should be less than 0.5 Amps at 12VDC

SPECIFICATIONS:

Operating voltage: 10.5 to 15V DC

Alarm Setpoint (fixed) 60 C (165 F)

HORN: 95 dB at 12VDC

Sensor: 10K ohms at 25 C (77F). Max operating temperature: 150 C (300 F)

BOREL MANUFACTURING INC. · 800 824 4449 · WEBSITE: www. borelmfg.com

E-MAIL: borelmfg @ earthlink.net

Raw water cooling and wet exhaust basics.

Typically raw water cooling temperature will increase about 30F from inlet temperature. This increase is for cooling engine block and cooling exhaust gases at full engine power. If your wet exhaust temperature is greatly over this temperature (incoming + 30F), reduced water flow is the probably cause and maintenance is required.

1. Sea Strainer: Normally these are equipped with a clear glass or plastic housing. Inspection and cleaning

is quite simple.

2. Raw Water Pump: Typically these are vane impeller type. The impellers can wear or even break. If the

Impeller breaks during operation, try to account for all the pieces. What you can not find is probably

lodged in the heat exchanger and will reduce water flow. Pump housings can become pitted or corroded.

This will cause reduced water flow and shorter impeller life. Replacement of pump is the only solution.

3. Heat Exchanger: These can become corroded or blocked with deposits. Deposits will reduce flow and reduce heat transfer. Most have removable end plates for inspection. Mechanical reaming or chemical

treatment can be used to remove deposits. Extreme caution should be used when reaming. Best to consult a professional engine mechanic for reaming.

4. Wet Exhaust Mixing Elbow: Typically these are made of cast iron. Deposits and fouling can form at

the raw water inlet, reducing flow. Periodic inspection is recommended.

BOREL MANUFACTURING INC. · 800 824 4449 · WEBSITE: www. borelmfg.com

E-MAIL: borelmfg @ earthlink.net