RVMP flexTEMP FG-SBMC-11 User manual

ORIGINAL INSTRUCTIONS
RVMP®FlexTempTM
On-Demand Gas Water Heater
Product Model No: FG-SBMC-11
USER MANUAL
(Picture shown here is for reference only)
Authorized for Installation in Recreational Vehicles
Visit rvmp.co • Copyright© 2022 RV Mobile Power, LLC. - All Rights Reserved.
Read this manual carefully before operation.
This manual includes important guidance for safety operation.

WELCOME TO THE FLEXTEMP™ FAMILY! 2
SAFE OPERATION ENVIRONMENT 3
SAFE OPERATING GUIDELINES 3
DRIVING GUIDELINES 4
PRODUCT DETAILS 4
PERFORMANCE CHARACTERISTICS 8
TECHNICAL SPECIFICATIONS 9
WIRING DIAGRAM 10
EXPLODED VIEW 11
INSTALLATION 12
OPERATIONS IN FREEZING TEMPERATURES 20
WINTERIZING THE APPLIANCE 21
REGULAR INSPECTION 22
HARD WATER TREATMENT 23
ERROR CODES 23
TROUBLESHOOTING CHART 25
TECHNICAL MARKING SPECIFICATIONS 26
LIMITED WARRANTY (NORTH AMERICAN CONSUMER SALES) 27
1

Welcome to the FLEXTEMP™ Family!
Thank you for choosing the Flex Temp™ On-Demand Gas Water Heater from RVMP®. This appliance is a direct vent tankless
water heater for installation in recreational vehicles only and for use with liquified petroleum gas only. Before installing or
operating your new appliance, please read this manual carefully and carefully follow all instructions and safety precautions. The
manufacturer, seller, distributor, wholesaler, re-seller, and/or servicer do not accept responsibility for any damages due to the
failure of anyone to observe and carefully follow the instructions and warnings in this manual and the failure to do so will void
portions of the warranty.
PATENT PROTECTED - This product is protected by one or more United States Patents, please see www.rvmp.co/patents for
more information on patents covering this product.
WARNING
WARNING:If the information in these instructions is not followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
●Installation and service must be performed by a qualified installer, service agency or the gas supplier.
●Do not attempt to install this appliance as a do-it-yourself (DIY) project.
●Read all safety rules in this manual and within cited certification guidelines before installing this appliance.
●Follow any and all state and local codes.
●Follow the regular maintenance outlined in this manual.
CAUTION
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 vehicle.
●Shut off gas supply at gas container or source.
●DO NOT touch any electrical switch, or use any phone or radio in vehicle.
●DO NOT start vehicle’s engine or electric generator.
●Contact 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 gas supply until gas leak(s) has been repaired.
2

SAFE OPERATION ENVIRONMENT
Gas combustion consumes a large amount of air and generates hot exhaust gases including carbon monoxide as the appliance
works. Harm or even death may be caused by inhalation of excessive carbon monoxide. Therefore, the product must be installed
and used in strict accordance with the requirements of this manual in order to achieve a safe environment. Flex Temp™ and
RVMP® will not be held liable for any consequences of user’s failure to install and use the appliance in accordance with the
requirements of this manual.
●NEVER use this appliance in enclosed spaces or tents.
●ALWAYS turn the appliance off, and shut off fuel supply while parking the RV in an enclosed space, such as a garage or
repair shop.
●NEVER place seating, picnic tables, awnings, or canopies in a direct path of the exhaust outlet. Note that the
appliance can be installed under a RV retractable awning provided that there is no screen room or walled enclosure
created with the awning.
●NEVER install the applicant in an area where the inlet air vent can be covered by a door when opened.
●DO NOT use this water heater without a working carbon monoxide detector installed in the RV. Follow the
manufacturer's instructions and guidelines for its installation.
●ALWAYS keep the air inlet and exhaust outlet free of obstructions in order to ensure clean combustion.
●DO NOT place articles on or against the appliance.
●DO NOT lean any objects against the water heater’s access door or place any foreign objects within 24" (610 mm) of
the access door.
●DO NOT use or store flammable materials near the appliance.
●DO NOT spray aerosols in the vicinity of the appliance while it is in operation.
●DO NOT modify the appliance.
SAFE OPERATING GUIDELINES
●The operator is responsible for their own health and safety, persons with pacemakers should discuss with their doctor
before opening the access door, or performing any service repairs.
●The operator is responsible for the water quality used in the appliance.
●The operator is responsible for all routine inspections found in the Cleaning and Maintenance section of this manual.
●The operator is responsible for using and maintaining gas cylinders properly and/or as specified by the RV
manufacturer.
●The operator is responsible for ensuring no spray water enters the appliance when cleaning the RV.
3

●The operator is responsible for using the appliance for potable water only. They are responsible for ensuring
non-potable water sources, components, or heating systems, new or old, are not connected in any means to the
appliance.
DRIVING GUIDELINES
●The operator is responsible for ensuring all components are seated and locked in place before moving the RV, check the
following: (1) Access door is flush with the mounting plate. AND (2) Door lock is engaged.
●The operator is responsible for ensuring the gas system is turned off at the gas cylinders before transit. Turn off all
necessary valves as indicated by the RV manufacturer.
●The operator is responsible for making sure the appliance is off when refueling, traveling through tunnels, parking in
garages or car ports, or on ferries.
PRODUCT DETAILS
Front View
Rear View
Front View with Door Opened
Remote Display
4

General Internal Components View
Detailed Internal View
5

Control Board Layout
Name
Type / Model
Technical data
1
Pressure relief
valve
J416
3/4" NPT (M) x 3/4" NPT (F)
2
Motor
KDBF105
DC 24V, R 3000r/min
3
Power Switch
KCD1
125VAC, T=125℃
4
Fuse holder
H3
250V,10A
5
Fuse(not show)
521
0.315-10.0A
6
Burner control unit
HMJD-H237
12Vd.c, Operation temperature -10℃ to 65℃
7
Wire
1007
80℃, 300V
6

8
Combination gas
control
PCV-10-02FD
Operation temperature -25℃ to 80℃
9
Temperature
limiting
thermostat
KSD301
53℃ Operate
10
Anti-freezing
thermostat
H31
250V, 10A, 5℃ operate. 15℃ cutoff
11
KJ1/KJ2 (relay)
SJ-S-112DM
AC250V, 5A, T105
12
Connector on PCB
XHB-4BH
CN4, 3A
XHB-8BH
CN7, 3A
XHB-9BH
CN6, 3A
VH-4BH(HX39600-4A)
CN1, 7.5A
VH-2BH(HX39600-2A)
CN5, 7.5A
13
U4 (main MCU)
MC96F6432Q
44 MQFP
14
PCB
KB-6160A
130°C, V-0
ILM-R1
130°C, V-0
15
U3 (monitor MCU)
MC96F8204M
16 SOPN
7

PERFORMANCE CHARACTERISTICS
●Microcomputer intelligent control
The CPU chip of the system automatically sets the optimal operation parameters for the appliance according to the
bathing environment data such as water volume, ambient water temperature, gas pressure, and the desired hot water
temperature.
●Variable hot water temperature
The water temperature ranges between 95°F and 123°F(35°C and 51°C).
●Digital temperature control
The temperature can be adjusted through a simple and intuitive user interface. The control system automatically
adjusts the patented proportional valve and keeps the water temperature constant via the water temperature sensor.
The microcomputer will automatically store the water temperature setting. There is no need to re-enter the desired
setting when the appliance is restarted.
●Remote LCD display
Each unit includes an easy to operate remote LCD display control, making the efficient operation simpler and more
reliable. Allows for in-coach adjustment of water temperature by the user. The appliance can display the temperature,
the combustion state, the spray state, the running state of fan, the set temperature, the 20-minute countdown, the
code of fault and the alarm function
●Low-water pressure for starting
Minimum working water pressure: 0.l MPa (14.5 psi) (minimum water flow 2.8L/min).
●Over Pressure System
The appliance can release pressure automatically when the water pressure exceeds the set value (0.75MPa or 109 psi),
the safety valve will open releasing the pressure.
●Multiple protections
The appliance has multiple protections, which include boil-dry protection, self-diagnosis of fault, safety protection
device for extinguishing flame, overheating safety protection device, safety protection device for fan fault, electric
leakage safety protection device, protection device for excessive air pressure, automatic pressure relief valve for
excessive water pressure, anti-freeze device, protection device for gas leakage.
8

TECHNICAL SPECIFICATIONS
Models
FG-SBMC-11
Rated heat load (Btu/h)
55000
Rated water production capacity
8kg/min (2.11Gallons/min)
Exhaust mode
Forced exhaust
Control mode
Water control system
Ignition mode
Pulse electronic ignition
Applicable water pressure
0.1MPa - 0.75MPa
(14.5 psi - 109 psi)
Minimum flow for starting
2.8L/min (0.74Gallons/min)
Rated voltage
DC 12V
Rated gas pressure
Liquified petroleum gas
2.80kPa
Unit size (mm)
430*320*320
Net weight (kg)
10.9
Exhaust pipe specification
60
Rated power consumption
36W
Specification of
joints
Water inlet joint specification
½” Female NPT
Water outlet joint specification
½” Female NPT
Gas joint specification
Liquified gas
3/8” Male NPT Fitting
9

WIRING DIAGRAM
10

EXPLODED VIEW
11

INSTALLATION
DANGER
WARNING: Suffocation and/or Fire Hazard
Observe all installation material in accordance with governing codes and ordinances.
Failure to the follow all instructions will result in serious injury, property damage, or death.
The installation of this appliance, along with all subsequent components to support installation and operation of the
appliance, must conform with country, state and local codes. In the absence of such codes, refer to the latest editions of:
●USA:
○ANSI A119.5 - Recreational Vehicles (RV)− NFPA 1192 - Park Model RV
○ANSI/RVIA LV - Low Voltage Standard− NFPA 70 - National Electric Code
○ANSI Z223.1 - National Fuel Gas Code - NFPA 54
●Canada:
○CSA Z240 RV Series - Recreational Vehicles
○CSA Z241 - Park Model RV
○CSA C22.1 - Canadian Electric Code
○CSA B149.1 - National Gas and Propane Installation Code
CAUTION
CAUTION: Always wear protective gear such as gloves, eyewear and clothing to avoid injuries
during installation and servicing of the product.
●For Recreational Vehicle (RV) installation only!
NOTE: This water heater is certified ANSI Z 21.10.3 /CSA4.3-2017 for installation in Recreational Vehicles (RV) and is not for use in Marine or
Space Heating Applications. RV’s are recreation vehicles, having their own power or towed by
another vehicle, designed as temporary living quarters for recreation, camping, or travel use.
●Any Installation must be performed by a qualified person, in accordance with this instruction manual.
●DO NOT use test pressures higher than 40in-wc (1.45PSI) to test the gas leaks.
●DO NOT attempt to modify the appliance.
●DO NOT alter the appliance for a positive grounding battery system.
●DO NOT move the appliance by grabbing the interior components.
●Make sure all exhaust gases are directed outside the RV.
●Protect all combustible material from the exhaust gases.
●DO NOT draw air for combustion from occupied spaces.
●Always disconnect the 12V appliance (to protect the control from surges that may occur) when performing Dielectric
(hi-pot) testing, welding, electrical, etc... work on the coach.
●Only use with a proven 12V power source such as battery or approved converter.
12

●DO NOT vent the water heater using a venting system serving another appliance.
●DO NOT install directly into a shower, or near direct heat.
Prepare Opening
1. Choose a location to place the appliance, based on the following criteria:
a. DO NOT install on the rear or front of the RV to minimize contamination from road grime, debris and wet roads when
traveling.
b. DO NOT install the appliance in an outdoor enclosed area.
c. DO NOT install the appliance in any location where the exhaust vent may be covered or obstructed when a swing
door, bag door, slide out, pop up, etc. is partially or fully extended.
d. DO NOT install this appliance on any door or slide out area.
e. DO NOT install the appliance where the access door is less than:
i. 9" (229mm) from any opening into the vehicle
ii. 36" (914) from any motor driven air intake
iii. 36" (914mm) from the any gas tank connection or ventilation.
NOTE: These are guidelines, refer to NFP1192, Z240 RV edition for specific requirements.
f. Choose a convenient location where supply water, LP gas, and 12V DC is accessible to the back side of the
appliance for installation and servicing.
g. The water heater is designed to be installed on a flat floor (made of Wood or Linoleum) or a fixed platform.
h. It is recommended that the appliance be located in a central location to the hot water loads.
i. Ensure that a clearance of at least one inch will remain after installation between the top surface of the
appliance and any combustible material.
j. NOTE: To install on a carpeted area, a metal or wood panel that extends at least 3 inches beyond the width and
depth of the water heater is required to install under the unit.
k. If water leakage would damage the adjacent area to the installation, a drain pan should be installed that will
drain to the exterior of the RV.
2. Create a cutout with the dimensions (shown in inches) below, preferably with square corners.
13

a. Dimensions for cutout are: 13.040” h x 13.080” w x 18” of clear space at rear of unit. (See drawing above)
b. Ensure that the front edge of the opening is surrounded by a solid frame which can accept anchors for securing
the appliance. If necessary, reinforce the opening with 1.5” x 1.5” or 2” x 2” framing.
c. Ensure that the appliance is supported by a solid floor or platform with enough weight bearing capacity. If
necessary, construct a platform or base to support the appliance.
d. Leave adequate room at the rear of appliance for connection of gas, water, and electrical connections.
Prepare Propane Gas Supply Lines
DANGER
WARNING: Fire or Explosion Hazard
Follow all applicable codes, regulations and instruction material when performing any install or service work.
Failure to follow instruction will result in product damage, serious injury or death.
Fuel entering the appliance must be in gas phase, liquid phase must not be used and will result in damage to the product.
●This appliance is rated for 55,000 BTU/HR, 11~14in-wc. (27.4~34.9mbar). Follow NFPA1192 and Z240 RV series for
proper pipe sizing based on additional gas burning appliance loads.
●Use with LP gas (propane) only. Butane or any mixtures containing more than 10% butane must not be used.
●The gas line must terminate with a 3/8" NPT female fitting to connect with the male fitting at the inlet of the appliance.
●A non Metallic Flexible gas hose must be rated for 149°F (65°C). Anchor appropriately to prevent fatigue and failure
from wear edges.
●Make sure that the operating pressure of the gas supply corresponds to the operating pressure of the appliance
11~14in-wc (27.4~34.9mbar).
1. Locate entry point for the plumbing to service the rear of the appliance. Ensure entry point is not in the footprint space of
the appliance.
14

2. Feed propane line into proximity of the appliance install location, leave enough length to flex into position so that when
connected no kinks are created.
NOTE: An approved semi-flexible metallic pipe is acceptable to connect as an extension from the propane line to the
appliance.
3. Install a propane shut-off valve within the propane supply line to the hot water heater so that propane supply can be turned
off to the appliance in case of an emergency, a leak, or when the appliance is stored for more than 30 days without usage.
See the Figure below.
Prepare Water Plumbing Lines
●The plumbing must be rated to supply between 35-70PSI nominal.
●Connections can be made using PEX swivel nut adapters with NPT straight threads and a cone seal or with standard 1/2”
NPT fittings.
●For proper operation this water heater requires a minimum water flow of 2.8 Liters per Minute (L/min) or 0.74 Gallons per
Minute (Gal/min).
1. Locate entry point for the plumbing to service the rear of the appliance. Ensure entry point is not in the footprint space of
the appliance.
2. Create a piping layout to supply the appliance with cold water inlet and hot water outlet.
NOTE: Dry fit tubing and fittings before clamping together. Adjust sections to avoid excessive stress on the fittings when
assembled to the appliance. It may be helpful to fit the appliance into position to determine the appropriate piping layout.
3. Install a shut-off valve within the cold water supply line to the hot water heater so that water supply can be turned off to the
appliance in case of a leak in the appliance or when the appliance is stored for more than 30 days without usage. See the
Figure below.
15

Prepare Electrical Wiring
WARNING
WARNING: Electrical Shock Hazard
●Disconnect all power before performing any work.
●Always use a certified and proven 12V isolated power supply, that is properly grounded to the RV.
●Follow all applicable codes, regulations and instruction material when performing service work.
Failure to follow instruction could result in serious injury or death.
1. Disconnect all power before performing any work.
○Wiring connected to or in proximity of the appliance must be rated for 140°F (60°C) minimum.
○Use only insulated terminals for all electrical connections. The appliance requires a power source that can adequately
provide 10~17V DC to function properly. Contact furrion for available Power centers, converters and distribution
panels.
○Select a distribution branch greater than 3A, preferably 15 amp, to provide nominal 12V to the appliance from the
distribution panel.
NOTE: The appliance has a built in 10A fuse, serviceable from the front of the product. The appliance can be on a dedicated
or shared branch circuit with the same or higher rating.
Optional: A power switch can be placed in the living quarters for convenience, but not required as a switch is located
externally on the appliance. If the switch is fused, make sure it is rated for at least 3amps.
2. Locate an entry point for the wiring to service the rear of the appliance. Ensure entry point is not in the footprint space of
the appliance. Make sure any housing or encasement edges are protected to prevent wire abrasion from occurring.
3. Determine the appropriate wire gauge (AWG) for the 12V power supply length. Ensure enough wire is available to make
adequate connection.
○16AWG max. 40 feet (12m)
○14AWG max. 66 feet (20m)
4. Feed wire from power source to the entry point. Make a suitable connection to the power source.
16

Prepare Remote Control
1. Determine a location to install the wall remote control within the interior of the RV.
2. Drill a 3/4" hole and clean the edges.
3. If necessary, run two electrical wires that extend the wall control connections (blue wires) to the appliance connections
(blue wires) using the appropriate wire size. 16AWG max. 65ft (20m).
Install Appliance
1. Remove the appliance from its packaging.
2. Remove protective caps for COLD (blue) and HOT (red) water along with any caps for the gas inlet.
3. Open the front access door.
4. Position the appliance into the frame opening.
5. Ensure that the electrical power switch on the front of the appliance is set to the OFF position.
6. Ensure that the gas supply is turned OFF.
7. Connect the gas service line to the gas inlet on the back of the appliance. DO NOT overtighten.
17

8. Connect the power supply wires (red and black wires on rear of water heater) to the appropriate nominal 12V DC power
source connection.
NOTE: The red wire is positive (+) and the black wire is negative (-).
9. Connect the wall controller wires (2 blue wires on the appliance).
NOTE: Polarity does not matter, the wires can be connected to either blue wires.
10. Connect the HOT and COLD water lines to the appropriate connections on the back of the appliance using ½” NPT
connections. DO NOT overtighten.
11. Apply adequate amounts of water sealing material (ex. butyl tape 1 inch wide, not included) around the entire backside of
the front flange and any holes. DO NOT use adhesive sealing material (ex. silicone) for the watertight seal.
12. Slide appliance through the cutout fully until the front flange is contacting the RV sidewall.
13. Secure the flange to the sidewall using fasteners, preferably stainless steel or corrosion resistant.
18

14. Apply any additional amount of water sealant around the flange and perimeter of the front of the appliance. Close the front
access door.
Check for Possible Gas Leak
WARNING
WARNING: Fire and Explosion Hazard
●Ensure test pressures are below 40in-wc (100mbar).
●DO NOT use matches, candles or other sources of ignition when checking for gas leaks.
●Use a gas leak detection liquid or equivalent.
●Make certain to re-test all fittings after making adjustments to loose connections.
Failure to follow instruction may lead to serious injury, property damage or death.
1. Verify the electric power switch on the water heater is in the “OFF” position.
2. Turn on the gas supply or alternative pressure supply.
3. Check the appliance and all gas connections for gas leaks with leak detection liquid (not provided) or an equivalent gas leak
detection method. Bubbles indicate a gas leak that must be repaired.
4. Repair gas leaks as needed.
5. Repeat gas leak check after any adjustments to loose connections.
NOTE: After leak checking, make sure the gas supply pressure corresponds to the operating pressure of the appliance
11~14in-wc (27.4~34.9mbar).
Check for Possible Water Leak
1. Verify the electric power switch on the water heater is in the “OFF” position.
2. Turn on the water supply to the unit
3. Open water faucets to fill the system with water.
4. Close the faucets when the water is flowing smoothly and all air is removed from the lines.
5. Check all connections for water leaks by eye and touch.
19