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Engineering Company, Inc.
Electric Water Heaters
With or Without Optional Heat Exchanger
INSTALLATION AND MAINTENANCE INSTRUCTIONS
MOUNTING THE HEATER water t o run a few minutes to expel all air from water
The heater should be installed in a location where it heater and lines. This is VERY IMPORTANT because
will not be subjected to external water spray-especially if air remains in the heater and the electric heating
salt water. The life of a heater will begreatly extended element is not fully submerged, the element will burn
by choosing a protected location. A heater located out when the power is turned on.
in a sail locker for example, cannot be expected t o The safety relief valve should be connected to hose or
last as long as one installed in a clean, dry engine piping so that overflow can run unrestricted into the
room. Mount the heater so that the electrical cover bilge. This will prevent any overflow or dripping from
plates, plumbing nipples and heat exchanger (if used) causing damage to the heater jacket or base.
Using the three mounting lugs provided, securely ELECTRICAL
mount the heater t o the deck or other sturdy area. CAUTION: No 115 or 230 volt AC wiring should be
I t is preferable that bolts, nuts and lockwashers be done by other than a qualified electrician.
used but if wood screws or lag bolts must be used, Protect the 115 volt shore line with a 15 amp fuse or
they should be heavy enough t o support the strain circuit breaker (10 amp for 230 volt units); a Ground
when the heater is filled with water and the boat is Fault Circuit I nterrupter (G FCI) in the correct value
rocking. Raritan 20 gallon water heaters (R20, R20E, may be included in the installation for additional
NP20) require auxiliary bracing to support the weight safety. Use only STRANDED #12-3 cable t o the
of the tank filled with water when the boat is in heater. Never use solid wire (ROMEX-type) cable
heavy seas. Likewise, i t is desireable to add auxiliary on a boat; vessel vibration can cause solid wire to
, bracing to the 6 and 12 gallon models, especially if break due t o metal fatigue (U.S. Coast Guard). In
the boat may be subject to excessive heeling and running the cable to the heater, support it securely at
pitching in heavy seas. frequent intervals. Do not run it in the bilge. Allow
about 12" of extra wire to make necessary connect-
PLUMBING ions. Remove the large rectangular cover, which gives
To connect the heater t o the cold water supply, in- access to the electrical connection points. Strip 8"
stall a "tee" in the cold water supply line. From the of the outer insulation from the end of the cable,
branch of the "tee", connect a line to the lower exposing the- three separate insulated wires. Loosen
heater connection marked COLD. A check valve the strain relief connector in the smaller cover plate
MUST be in this line to prevent hot water backflow and insert the cable. Tighten the strain relief con-
into the cold water lines. Also, it is a good idea to nector onto a portion of the cable that was not
install a drain valve between the check valve and the stripped. Strip the insulation from the three wires
heater. to bare about %" of the stranded wire. Attach black
The upper heater connection, marked HOT, is con- and white wires to thermostat per installation dia-
nected to the hot water faucets, shower, etc. Heat gram. Use crimp-on terminal ends for a secure install-
resistant flexible hose or poly tubing, suitable for the ation. Do not use solder to connect wires as it, in
temperature and pressure limits of the safety relief effect, makes a solid wire of the strands, subjecting
valve (75 PSI and 210 degress F.) may be used for it to the possibility of breaking due t o metal fatigue
both cold and hot connections. Secure all lines to from vibration. Join the green wire t o one of the four
the boat's structure a t frequent intervals. mounting bolts on the heating element using a crimp-
Avoid sharp bends and 90 degree ells in the plumbing on terminal end. Place the terminal protector in its
wherever possible, as they reduce water flow. Should correct position, replace the access cover and double
copper fittings be desired, avoid applying heat to the check t o be sure the tank is filled with water before
%" nipples protruding from the heater. Solder fittings turning on electricity. This can be verified if cold
first, then connect to the heater; the nipples contain a water runs out of any hot water faucet. After turning
._ nonmetallic lining which will be destroyed by heat
from soldering fittings. After all hot water lines
on the electricity, the water should be noticeably
warm within 30 minutes. Twenty gallon models (R20,
have been completely installed, open the hot water R20E, NP20) will take somewhat longer to initially
taps and turn on the water pressure system. Allow the heat the water.
TURNING ON THE ELECTRICITY WITH NO ELEMENT IN A VERY SHORT TIME. The pre- To determine the proper setting of the gate valve (4), best winterized together with the onboard water pres-
WATER IN THE TANK, OR WITH THE WATER ceding warning must also be remembered during the engine should be operated at full throttle with the sure system. This is accomplished by pumping all
LEVEL BENEATH THE IMMERSION HEATING springtime commissioning. gate valve wide open. When the engine temperature the water from the boat's fresh water tank(s), then
ELEMENT, W.ILL BURN OUT THE HEATING has stabilized, gradually close the valve until the pouring nontoxic antifreeze solution (propylene
engine temperature begins to rise. The valve should glycol, NOT ethylene glycol) directly into the fresh
then be reopened enough to establish the proper water tank(s). Turn on the water pressure pump and
engine operating temperature. Engine temperature open all faucets. When the antifreeze solution comes
Replaceable anode insi
I A -------I should be monitored to verify that the entire cooling
system is functioning correctly.
out of all faucets, both hot and cold, the whole
system is safe, including the pump. As a large quantity
of antifreeze is required to get the correct ratio of
this removable nipple The information above is only a general guideline and
DIMENSIONS any installation is made at the risk of the installer. antifreeze to water, it is not usually an economical
No responsibility to Raritan Engineering Company, method but it is by far the safest.
MODEL A B C D E* Inc. is to be presumed or implied from these general An alternate method is to shut off the electricity,
instructions. open all hot water taps on the boat to relieve the
6-gal. 14" 16 114" 10 1 1 8 33/32" 7 112" pressure, then remove both lines from the heater and
ADDING A HEAT EXCHANGER allow it to drain. After it has drained, blow it out
12-gal. 1 8 159116" 101/8 33/32" 7112" TO AN EXISTING ELECTRIC-ONLY with air pressure if available, then pour a quart of
WATER HEATER nontoxic antifreeze into the tank using a funnel and
20-gal. 18" 255116 191116" 33/32" 7112"
Adding a heat exchanger to Raritan Water Heaters a length of hose. Be sure electricity remains off
to allow the water to be heated via the engine cooling until spring. When recommissioning in the spring, run
* Heat Exchanger opening does not appear on NP series. system is only possible on "R-Series" water heaters water long enough to insure that all antifreeze has
(R6, R12, R20). "NP-Series" (NP6, NP12, NP20) do been flushed out BEFORE TURNING ON THE
not have a threaded opening to accomodate the addi- ELECTRICITY. Optional heat exchangers are winter-
INSTALLATION ~ o Water
tion of a heat exchanger. We do not recommend ized in conjunction with the boat's engine cooling
Excess Temperature -
attempting the addition of a heat exchanger to system.
Service Lines Pressure Safety Valve. "R-Series" water heaters manufactured prior to 1980,
To Overboard as they utilize a metal plug that has been installed
115 Volts AC TROUBLESHOOTING
under high torque at the factory to eliminate possible
Black to Power Line leaks. Recent "R-Series" water heaters (1980 to date) PROBLEM: Water does n o t get hot.
Red Reset Button Electric Comes From Thermostat On utilize a special plastic plug that is installed only hand 1. No electric power to heater. Be sure circuit breaker
Engine Hottest Water tight at the factory. The plastic plug is more readily or switch is turned on, fuses are intact and wiring is
Raw Water Cooling removed when converting to the heat exchanger not broken or disconnected.
Goes To Jacket On option. Metal plugs, installed before 1980, are virtu- 2. Bad heating element. Turn off power, remove access
Exhaust Manifold Riser
ally impossible to remove after years of repeated cover and depress red RESET button. Restore power.
Fresh Water Cooling
Goes To Expansion Or
heating and cooling. If no warm water after 30 minutes, check heating
When ordering a replacement water heater, we suggest element and thermostat.
the "E-Series" be ordered (R6E, R12E, R20E). These A. Shut off power and diconnect the two wires
units are shipped with a factory installed heat ex- connected to the heating element. Check for conti-
changer. This allows the heater to be installed in the nuity through the heating element with an ohmmeter.
CAUTION: Heater must be filled with water Before Power is turned on. electric-only configuration, with the heat exchanger If no continuity, heating element is burned out
available to be connected at a later date or, it may be and must be replaced. If continuity is indicated,
HEAT EXCHANGER A GENERAL GUIDELINE TO SHOW HOW A POR- installed in the dual configuration with no changes element is good; check thermostat.
TION OF THE ENGINE COOLANT MAY BE Dl- required later. B. Replacing the heating element. Turn off power
The Raritan Heat Exchanger is furnished with a male
2" NPT thread to f i t the opening provided in the tank. VERTED TO 3YIE OPTIONAL HEAT EXU-lAN- to heater, then turn off water pressure pump and
Two %" NPT female threads are provided in the heat GER: MAINTENANCE, WINTERIZATION open all hot water faucets. When water has stopped
exchanger for connection to hoses or piping from AND TROUBLESHOOTING flowing, pressure has been relieved; drain water
engine coolant. Because of the diversity of marine Little maintenance other than proper winterization is heater the rest of the way (through drain valve if
cooling configurations, it is not possible to provide required of the Raritan Water Heater. Periodic visual installed, or by removing cold water inlet hose or
universal installation instructions; the installer MUST inspection should be done to insure that connections pipe at bottom of tank between tank and check
follow engine manufactures's recommendatioils. THE are tight, wires are not frayed and that grounding valve). Remove access cover, two wires connected t o
FOLLOWING DIAGRAM IS INTENDED ONLY AS of the unit is sound. These checks should be in- heating element and four heating element mounting
corporated into the annual commissioning and winter bolts. Remove the heating element, discarding the
LEGEND: layup of the boat as a minimum, and should be done cylindrical rubber gasket. Install the new element and
1. Hottest Water from Engine (Full Flow) more often if possible. rubber gasket (never reuse old gasket) with the
2. PipeTee; Full Flow on Run, %" NPT on Branch A removeable magnesium anode is integral with the arrows on the heating element flange pointing up and
MOTE: Some marine engines run at higher 3. Hose to Hot Water Heat Exchanger hot water outlet fitting. I t should not be necessary down. Be sure to reconnect the ground wire. Recon-
temperatures than the range of the pressure 4. Gate Valve Sized to Permit Full Flow of Coolant to inspect or replace the anode unless discoloration, nect the black and white wires to the new heating
relief valve on the water heater. For use with 5. Pipe Tee: Full Flow on Run, %" NPT on Branch unusual smell or taste develop in the water. The element. Close drain valve or reconnect plumbing
these engines, an alternate location for source 6. Hose from Hot Water Heat-Exchanger to cold water inlet of water heater. With hot water
water will have to be selected. See safety
annode is replaceable as a unit and may be ordered
7. Full Flow Return to Engine Cooling System faucets open and ELECTRICITY TURNED OFF to
valve problems, under Troubleshooting. from Raritan dealers or from the factory. Specify
3 6 6, 12 or 20 gallon model. the water heater, turn on water pressure pump. Allow
pump t o run a few minutes to expel air from the
lines, then shut off faucets. Restore power. Check
WINTERIZATION for leaks around the heating element while waiting
Before beginning winterization, be sure electricity is for the water to heat. If no leaks, replace the cover
turned off to the water heater. The water heater is plate. If a leak appears, turn off power, drain tank
and check cylindrical gasket; be sure it is seated is running, the operating temperature of the engine
correctly. may be in excess of the relief valve's rating. This will
3. Bad thermostat. If the ohmmeter shows conrinuity usually show up on the first major cruise or on a
through the heating element but the water is not heat- shakedown cruise. The situation described is possible
ed, a bad thermostat is indicated. with certain "fresh water" cooled engines that oper-
A. Turn off power t o heater, depress red RESET ate at over 200 degrees F. Engine coolant is normally
button and turn thermostat to highest setting. Dis- tapped off just ahead of the coolint system's heat
connect both wires t o heating element. Check for exchanger, where the water is hottest, then fed to the
continuity with an ohmmeter through the thermostat. heat exchanger in the water heater. The cure is t o
from black wire terminal t o black wire terminal and tap the coolant DOWNSTREAM of the heat exchang-
from white wire terminal to white wire terminal. er where the coolant is a t a lower temperature. Check
Each side must show continuity. If continuity is not the temperature of the coolant piped to the water
registered on either side, the thermostat must be re- heater to be sure it is not over 170 degrees F.
placed. If thermostat tests good after heating element
also tested good, recheck that power is available t o PROBLEM: Constant dripping o f the relief valve, re-
unit. Check wiring for breaks, etc. gardless o f temperature.
B. Replacing the thermostat. Turn off power, re- This is usually caused by foreign matter lodged in the
move access cover to expose thermostat terminals. seat of the pressure relief valve. Shut off fresh water
Disconnect both sets of wires from the thermostat. pressure pump, shut off electricity and open hot water
Snap the thermostat out of i t s mounting and insert taps t o relieve pressure in the system. Drain water
new one. Reconnect both sets of wires to the thermo- from tank until it is beneath the level of the relief
stat. Wire the thermostat according to the Installation valve. Remove the relief valve and clean it thoroughly.
Diagram, ignoring additional terminals that may be Open the actuating handle and flush the valve with
on the new thermostat. Fill heater with water, then lukewarm water. Be sure no sediment remains on the
turn on electricity. Water should be noticeably warm seat of the valve plunger. Close valve and reinstall
within 30 minutes. using tape dope or pipe joint compound. Refill tank,
PROBLEM: Safety valve opens and releases h o t water. expel air from the lines, then turn on electricity.
1. Take care to avoid scalding; safety valve is preset Observe the relief valve as the tank fills and as the
to open a t 210 degrees F. Remove the access cover water heats. I t should remain closed and not drip.
and check temperature setting on thermostat. Facto- If dripping begins again, replace the valve.
ry setting is 130-140 degrees F. If setting is higher,
turn it all the way t o the left. Allow heater to operate
an hour and observe results. If lowering the temper-
ature setting doesn't cure the problem, perform the If further help is required or if an unusual situation
following: Shut off electricity to the heater and ob- should develop, contact Raritan Customer Service in
serve if the water flow stops over the next few hours. Millville, NJ or Ft. Lauderdale, FI for assistance.
If the water flow doesn't stop as the tank cools down, Any replacement part for a Raritan Water Heaters
a defective pressure relief valve is apparent. Unscrew ordered from Raritan dealers or direct from the
and replace it after turning off the electricity and factory. When ordering heating elements, specify
draining the tank. If the water stops flowing as the whether 115 or 230 volt. When ordering anodes or
temperature drops, a defective thermostat is indicated. sheet metal parts, specify whether 6, 12 or 20 gallon
Replace the thermostat following by earlier directions. unit. Relief valves, thermostats, heating elements,
2. I f the heater is equipped with an optional heat ex- gaskets and heat exchangers are interchangeable
changer, and the relief valve opens while the engine between the three sizes.
SAVE THESE INSTRUCTIONS
To order replacement parts or t o request additional in-
formation or assistance, contact Raritan Customer
530 Orange Street, P.O. Box 1157, Millville, NJ 08332 USA
TWX: 510-687-7545 RARITAN M IVE
Southern Office and Plant:
3101 sw Second Avenue, Fort Lauderdale, FL 33315 USA
Specifications subject t o change without notice. Printed in USA