PrecisionTemp RV-550EC User manual

RV550EC OPERATING INSTRUCTIONS
The RV-550EC is designed to give a continuous flow of hot water as long as required and
maintain temperature within the capacity of the heater ( 5°F temperature rise at one GPM).
The temperature on your water heater has been factory set to approximately 120°F. It is not
recommended that you change this setting. Doing so could result in dangerously hot
temperatures that could result in severe injury. If it is necessary to change the setting refer to
the Service Manual or call PrecisionTemp.
The heater is dormant until a hot water tap is opened. The heater will not fire at very low
flows; i.e., under 0.4 GPM. During normal operation the RV550EC will have a steady flashing
green LED light on the green control board. A red flashing LED indicates a self diagnostic
trouble code; refer to the Service Manual or call PrecisionTemp for assistance. When
adjusting water temperature it is best to start with hot only and slowly add cold into the mix
until the desired temperature is reached.
NOTE: When using an "on/off" button on a shower head or an outside wash down box, always
turn off the hot and cold water valves when finished. Not doing so will result in cold water
bleeding into the hot water system. This will either cause the water heater not to ignite or
result in alternating warm and cold water.
Dry Camping
RV showerheads are designed to drip when turned off and will allow the hot water line to be
filled with cold water. When showering it is recommended that you leave the water running
as you would at home. You will not run out of hot water and you will not waste additional
water waiting for the cold water to purge from the water line every time the water is turned
back on.
Winter Operation
When operating the RV550EC in cold climate conditions the flow of water may have to be
slightly restricted or slowed at the faucet to maintain the set temperature of 120 degrees.
NOTE: Your RV550EC is quipp d with th Cold W ath r Prot ction Packag . 12vdc pow r
and propan must b l ft on to prot ct th RV550EC from fr zing in cold climat
conditions.
Wint r Driving Instructions: Und r no circumstanc s should you trav l in fr zing
conditions without first draining wat r from th unit. Follow the winter driving draining
instructions prior to driving in freezing temperatures. Freezing is not covered under the
product warranty.

RV550EC Wat r H at r
Wint r Driving Draining Instructions
1. Turn off wat r supply.
2. Op n all hot wat r fauc ts.
3. R mov th RV550EC door and op n th Pr ssur R li f Valv by moving th l v r to
th op n position.
4. Th wat r lin s and th RV550EC will now drain.
5. Wh n all wat r is drain d from th hot wat r lin s and th Rv550EC Flowm t r is
mpty r install th wat r h at r door. L av th Pr ssur R li f Valv and hot wat r
fauc ts op n whil driving.
6. Th h at r is now saf to driv in fr zing t mp ratur s.
7. Onc your d stination is r ach d clos th RV550EC Pr ssur R li f Valv . Turn on
wat r supply and clos all hot wat r fauc ts onc air is purg d from th lin s.

Routine Maintenance
All faucet aerators and showerhead screens should be cleaned regularly. It is recommended
that the RV-550EC be inspected by a qualified service technician at least once a year.
Particular attention should be paid to the following:
1. Inspect the air inlet openings and flue area to be clear of any debris or obstructions, (leaves,
bug nests, spider webs, etc.)
2. Check that the heater mounting is secure to the coach and there are no areas for potential
water leaks.
3. Open the cover of the heater and inspect for debris or obstructions under the burner or in
flue hood.
4. Visually inspect wiring. Be sure there is no chafing of the insulation. Be sure that the direct
spark ignition cable (black) wire is secured to the spark probe located at the lower right heat
exchanger area.
5. Check for soot around the flue. Soot is a sign of incomplete combustion. If you find soot a
qualified service technician should be notified to correct the problem.
6. The pressure relief valve should be manually activated once a year by moving the lever on
the top of the valve 90°while power is turned off. Never perform this operation while the
burner is operating or scalding could occur. Never plug the pressure relief valve. If the valve is
actuating too frequently contact PrecisionTemp or replace valve .
7. Unplug all connectors and reconnect with power turned off. Inspect and clean corrosion
from the ignition cable/spark probe connection and the ground wire connection.
NOTE : Should overheating occur or the gas supply fails to shut off, turn off gas valve at the
supply tank. Immediately call a qualified service technician
WARNING: Always turn off th 12-volt pow r supply to th h at r whil th v hicl is
moving and during any fu ling op rations. Op rating this wat r h at r or any oth r ignition
sourc during fu ling could caus a fir or xplosion, which could r sult in s rious injury or
d ath. Trying to produc hot wat r whil driving or moving may damag th RV500
l ctrical compon nts and caus a fir .

IMPORTANT COLD WEATHER PROTECTION INFORMATION
WARNING: Do not disconn ct th l ctrical supply or turn off th propan
supply wh n t mp ratur s ar n ar or b low fr zing. Th RV550EC fr z
prot ction syst m will not work if th l ctrical pow r sourc or propan is
disconn ct d. Your h at r is quipp d with th cold w ath r prot ction
packag (call Pr cisionT mp for d tails).
WARNING: Und r no circumstanc s should you trav l during fr zing
conditions without first draining wat r from th RV550EC.
WINTERIZING
Draining
1. Turn off th pow r and gas supply to th RV550EC.
2. Turn off main wat r supply.
3. Op n all hot wat r taps. (bathroom, kitch n, laundry, tc.)
4. Drain all wat r from plumbing lin s.
5. Op n pr ssur r li f valv to drain r maining wat r from
th RV550EC flowm t r and h at xchang r.
6. Aft r compl t ly draining th syst m it can b wint riz d lik any
oth r RV by purging r maining wat r out of wat r lin s with compr ss d air or
pumping RV antifr z solution through th hot and cold wat r syst m; no
bypass valv is r quir d.
Pr cisionT mp
3428 Hauck Rd. Suit G
Cincinnati, Ohio 45241
513-641-4446
800-934-9690
s rvic @pr cisiont mp.com
2/2020