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• Install in recreation vehicles only. RV’s are recreation vehicles 
designed as temporary living quarters for recreation, camping, or 
travel use having their own power or towed by another vehicle.
• All combustion air must be supplied from outside the RV, and all 
products of combustion must be vented to outside the RV.
• DO NOT vent water heater with venting system serving another 
appliance.
• DO NOT vent water heater to an outside enclosed porch area.
• Protect building materials from flue gas exhaust.
• Install water heater on an exterior wall, with access door 
opening to outdoors.
• DO NOT modify water heater in any way.
• DO NOT alter water heater for a positive grounding system.
• DO NOT HI-POT water heater unless electronic ignition system 
(circuit board) has been disconnected.
• DO NOT use battery charger to supply power to water heater 
even when testing.

Do not install close to opening door or under room slide-

out where the vent or inlet louvers can be obstructed.

!

CRITICAL INSTALLATION WARNINGS

LPG GAS ON DEMAND
WATER HEATER

Model 
RV-550

11 Sunnybrook Drive
Cincinnati, OH. 45237
Phone: 513-641-4446 * 800-934-9690
Fax:      513-641-0733
www.precisiontemp.com

This water heater design has been certified by the Canadian
Standards Association for installation in recreation vehicles. 

This 

water heater is not for use in space heating applications.

SERVICE CALLS & QUESTIONS

Locations and phone numbers of qualified Service Centers can 
be found at our website www.precisiontemp.com or 
call 

800-934-9690 Ext. 109 to obtain service information.

—Do not store or use gasoline or other
flammable vapors and liquids in the vicinity 
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS

• Evacuate all persons from the 
vehicle.
• Shut off the gas supply at the gas 
container or source.
• Do not touch any electrical switch, 
or use any phone or radio in the 
vehicle.
• Do not start the vehicle’s engine or 
electric generator.
• Contact the nearest gas supplier or 
qualified service technician for 
repairs.
• If you cannot reach a gas supplier 
or qualified service technician, 
contact the nearest fire department
• Do not turn on the gas supply until 
the gas leak(s) has been repaired.

 Installation and service must be performed 
by a qualified installer, service agency, OEM 
or the gas supplier.

WARNING: If the information in these 
instructions is not followed exactly, a 

fire or explosion may result causing property 
damage, personal injury or loss of life.

Installation, Operation and Maintenance
Effective 3/13

USA and Canada – Follow all applicable state 
and local codes. In the absence of local codes or 
regulations, refer to the current standards of: 

Local codes or, in the absence of local 
codes, the 

National Fuel Gas Code, ANSI 

Z223.1/NFPA 54 

and/or 

CSA B149.1, Natural 

Gas and Propane Installation Code

.

 

Local codes or, in the absence of local 
codes, the Standard on 

Recreational 

Vehicles, NFPA1192 

and/or 

CAN/CSA-Z240 

RV.

 

CUTOUT Requirements 

OEM and Aftermarket – Unit can be installed in 
PrecisionTemp, Suburban and Girard openings. Unit can also 
be installed through the wall from exterior, or prior to erecting 
wall into place at OEM manufacturing facility. 
Rough opening: 

14.25” min. - 16.5” max High 

 

 

13.5” min - 17.25” max Wide 

 

 

17” min Deep 

1

 

 

 

 

 

 

 

 

 

Cincinnati,   OH   45237     1-800-934-9690 

www.precisiontemp.com 

TwinTemp      

 

    

Gas Instantaneous Water Heater and Space Heating Appliance

 

Complies with the requirements of ANSI Z21.10.3b 

This is a power vent combination automatic instantaneous water heater and space 
heating appliance for installation in a manufactured home (mobile home) or 
recreational vehicle, suitable for water (potable) heating and space heating.  This 
appliance must be installed in accordance with local codes or, in the absence of 
local codes, the Standard for Recreational Vehicles, ANSI A119.2/NFPA 501C. 

Patent Pending. 

 

BTU / HR   Input: 
Fuel: 
Inlet Pressure: 
 
Manifold Pressure: 
Power Input: 
Operating Pressure: 
 
Max. Water Temp: 
Orifice Size: 
Tank Volume: 
Recovery Rating: 

         

Elec. Element(s): 

55,000 – 12,000 
Propane 
10.5” WCI Min. to  
14” WCI max. 
1.30” – 9.20” WCI 
12 VDC      10 Amp 
125 PSI Max. 
(8.6 Bar) 

Max.

 

145° F      (63° C) 
#71 x 12 
2.5 US Gal    (9.5L) 
54 
120

vac, 

60

Hz, 

12.5

amps 

Serial No: 

“Clear Window (0.4” x 2.1”)” 

Minimum clearances from combustible 
and noncombustible construction is 1” 
(25mm) on the sides, back and top. 

 

WARNING: 

If the information in these 
instructions is not 
followed exactly, a fire or 
explosion may result 
causing property 
damage, personal injury 
or death. 

FOR YOUR SAFETY: 

Do not store or use 
gasoline or other 
flammable vapors and 
liquids in the vicinity of 
this or any other 
appliance. 

Installation and 
Service: 

Must be preformed by a 
qualified installer, service 
agency or gas supplier.

 

WHAT TO DO 

WHAT TO DO 

WHAT TO DO 

WHAT TO DO IF YOU SMELL GAS:

IF YOU SMELL GAS:

IF YOU SMELL GAS:

IF YOU SMELL GAS:    

1.  Evacuate all persons from the vehicle. 
2.  Shut off the gas supply at the gas container or source. 
3.  Do not touch any electrical switch, or use any phone or 
     radio in the vehicle. 
4.  Do not start the vehicle’s engine or electric generator. 
5.  Contact the nearest gas supplier or qualified service technician for repairs. 
6.  If you cannot reach a gas supplier or qualified technician, contact the 
     nearest fire department. 
7.  Do not turn on the gas until the gas leak(s) has been repaired. 
 

 

Label Specifications: 

Label Size: 6.0” Wide x 8.5” Tall 

Radius Corners: 
 

Label Corners: 0.25” 

 

Inside Note Boxes: 0.12” 

“Warning”/”For Your Safety” Box: 2.0” Wide x 3.5” Tall with a 0.05” Thick Border 
“What to do if……” Box: 5.5” Wide x 1.9” Tall with a 0.05” Thick Border 

 

c

IAPMO-T® 

Certified to ANSI Z21.10.3 / CSA4.3

Summary of Contents for cIAPMO-T RV-550

Page 1: ...onal injury or loss of life Installation Operation and Maintenance Effective 3 13 USA and Canada Follow all applicable state and local codes In the absence of local codes or regulations refer to the current standards of Local codes or in the absence of local codes the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or CSA B149 1 Natural Gas and Propane Installation Code Local codes or in the absenc...

Page 2: ... the case holes with no gaps or openings where the line passes through the case All connections must be made using TWO 2 wrenches to avoid twisting and damaging lines Damage voids the Warranty 5 Erect the side walls and cut the opening or orient the pre fabricated opening Frame with 2 x 2 lumber or equivalent 6 Pull the unit outward through the opening and bend all four flanges outward 90 degrees ...

Page 3: ... RELIEF VALVE THIS VALVE IS A SAFETY COMPONENT AND MUST NOT BE REMOVED FOR ANY REASON OTHER THAN REPLACEMENT This water heater is equipped with a pressure relief valve that complies with the standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Systems ANSI Z21 22 CSA 4 4 This valve protects against excessive water expansion only This water heater has separate and dedicated pr...

Page 4: ...e showerhead 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 Heater 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 e...

Page 5: ... Pressure Switch 15 Blower Assembly 16 Fan Base 17 Flue Hood Assembly 18 Case Assembly 19 Heat Exchanger 20 ECO 21 Plug 22 Orifice 72 45 000 Btu 23 Orifice 71 50 000 Btu 24 Orifice 027 55 000 Btu 25 Pressure Elbow NS Standard Door Kit Color Req NS Large Door Kit Color Req NS Optional Winter Kit NS Grommet NS NS 22 12 15 Volt Converter 5 1315 2454 1411 1375 1385 1073 3366 2028 3477 3476 3369 3503 3...

Page 6: ...n 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 tank is On there is gas in the tank and the gas line is purged of all air 2 Be sure that water flow is at least 0 5 gallon minute 3 Check that the ignition wire is plugged into the spark tower on the ignition control and is not tou...

Page 7: ...r other causes not arising from defects in material workmanship This warranty extends to the original owner of the product only and is subject to the following conditions 1 For a period of two years from the 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 compl...

Page 8: ... of the unit Locate the pipe out from under the coach while positioning it so that it points about 30 to the rear of the coach Allow for at least 6 to protrude from under the coach Now remove the pipe and coat the inside diameter of the flue pipe elbow with high temperature silicone sealant or equivalent Locate pipe onto tailpiece and screw the elbow of the pipe to the tailpiece This can be done w...

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