PrecisionTemp RV-550 NSP-EC Installation, Operation And Maintenance Manual Download Page 4

1)

Pressurize the water system by turning on pump or 
city water pressure.

2)

Purge all air from the system by turning on the 
faucets until a steady stream of water flows.

3)

Turn on the 12V DC power supply.

4)

Turn on the LP supply at the tank and the manual gas 
valve (if installed).The water heater will remain 
dormant until a water tap is opened and the heater 
senses water flow of at least 0.5 GPM.

5)

Turn on the hot water tap to full open. The heater will 
fire up within several seconds and hot water will flow 
from the tap in the time it takes to traverse the lines 
from the heater to the faucet. (If this is the first usage, 
you may have to turn the water on and off several 
times to purge the LP gas lines of air. If the heater 
fails to light or the lockout lamp (optional) illuminates, 
turn the power switch OFF, then ON to reset the 
ignition control. After ignition water flow can be 
reduced cold water added as desired. 

6)

To shut off the water heater, shut off the water. Shut 
off power at remote switch or breaker.

7)

Should overheating occur or the gas supply fail to 
shut off, turn off the “ON/OFF” power switch.

A Note About “Navy Showers” When Dry Camping

It is recommended to take a shower just like you would at 
home.  That is, leave the water running through the entire 
shower.  The hot water system is designed to deliver a 
continuous, comfortable flow of hot water and that’s the 
way it works best.  

Shutting off the shower with the shower head button 
wastes water.  Each time this is done, the shower head 
“trickles”, filling the hot water line with cold water. This 
cold water has to be purged from the line each time the 
shower head is turned back on.  Tests have shown that 
this will not save water and sometimes uses more water 
than leaving the shower run continuously

Winter Operation and Winterizing Water

This heater is equipped with freeze protection that will 
prevent freezing under most conditions.  In order for it to 
function, 12 VOLT AND GAS SUPPLY MUST REMAIN 
TURNED ON.  This allows the burner to fire and electric 
elements to protect the system.   Any freezing of the 
water heater or other plumbing components can cause 
severe damage that is not covered by warranty.

 

Winter Traveling Operation: 

In some areas all LPG appliances must remain off 

when coach is in motion.  If this is the case, drain 

heater as follows: 

1.

Turn off water pump and the power and gas to the 
heater. Open the pressure relief valve by lifting the 
handle to a 90° position from the normal position.

2. Open at least one hot and cold water tap in the 
coach. This should drain the system.

Winterizing Procedure:

Before storing the system for the winter, the plumbing 
system must be winterized. This can be done by either 
of the following methods:
1. All water should be drained from the system. To do 
this, open one tap at a time using compressed air to 
purge the system of all water.
2. Recommendations of your coach manufacturer 
should be followed. The water system can be filled with 
RV, non-toxic anti-freeze. When you see the anti-freeze 
coming from the hot water tap, the heater is protected

.

4

General Information and Maintenance

*  Periodically inspect the venting systems to assure that it is 

clean with no obstruction.

*  Keep appliance area clear and free from combustible materials, 
gasoline and other flammable vapors and liquids. 

Summary of Contents for RV-550 NSP-EC

Page 1: ...l codes the Standard on Recreational Vehicles NFPA1192 and or CAN CSA Z240 RV CLEARANCE Requirements SIdes top and bottom 0 Back Enough to make connections but no less than 2 5 Front Enough to remote...

Page 2: ...e unit and drill the 4 3 8 mounting holes in the floor 5 Apply a rubber gasket or sealant around the combustion air hole on the bottom of the unit and mount unit in place assuring the seal is in compl...

Page 3: ...odes or in the absence of local codes Standard on Recreational Vehicles ANSI A119 2 or CAN CSA Z240RV CAUTION ELECTRICAL DAMAGE Label all wires prior to disconnection when servicing controls Wiring er...

Page 4: ...water This cold water has to be purged from the line each time the shower head is turned back on Tests have shown that this will not save water and sometimes uses more water than leaving the shower r...

Page 5: ...or Flow Meter 2 Power Vent 3 Fluing Vacuum Switch 4 Combination Gas Valve 5 Igniter Proofing Probe 6 Manifold and Burner 7 Finned Tube Heat Exchanger 8 Flue Hood 9 Flue Pipe 10 T In Thermistor 11 T Mi...

Page 6: ...ctions is in the off position An open valve can also permit water to bypass heater causing it not to fire There Is No Ignition When Water Is On Power vent is running 1 Be sure the gas valve at the tan...

Page 7: ...he date of purchase PrecisionTemp will replace the complete water heater if the heat exchanger leaks due to corrosion This warranty includes reasonable labor charges required to replace the complete w...

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