Rinnai REU-V2520FFU series User manual

WARNING: If the information in these instructions is not followed exactly, a re
or explosion may result causing property damage, personal injury or death.
Operation / Installation Manual
– 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
•Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
•Immediately call your gas supplier from a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
–Installation and service must be performed by a qualified installer, service agency
or the gas supplier.
(Residential and Commercial indoor unit)
To Suit Models:
REU-V2520FFU........ R53
REU-V2520FFUC..... C53
REU-V2532FFU........ R85
REU-V2532FFUC...... C85
REU-V2520FFUD...... R53PLUS
REU-V2520FFUCD... C53PLUS
REU-V2532FFUD...... R85PLUS
REU-V2532FFUCD... C85PLUS
ANS Z21.10.3=CSA 4.3

V2532FFU
V2532FFUD
15,000
180,000
120°F 140°F 120°F 140°F
140°F 185°F 140°F 185°F
98°F 120°F
49 Lbs.
87%
49 dB (A)
Normal 75 watts
Standby 5.5 watts
Anti-frost Protection 100 watts
Electronic Fixed None
Natural Gas 6" W.C.
Propane 10" W.C.
Natural Gas 10.5" W.C.
Propane 13.5" W.C.
Ignition System
Water Temperature Control
Water Supply Pressure
Electric Connections
Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)
Safety Devices
Maximum Water Supply Pressure
Remote Control Cable
Flame Failure - Flame Rod
Boiling Protection - 210°F
Over Current - Glass Fuse (3 amp)
Remaining Flame (OHS) 207°F Bi-Metal Switch
Thermal Fuse 264°F
Direct Electronic Ignition
Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)
Simulation Feedforward and Feedback.
Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT
Model
Minimum Gas Consumption Btu/h
Maximum Gas Consumption Btu/h
With or without remote controls, mounted in kitchen, bathroom, ect.
Connections
By-Pass Control
Minimum
Gas Supply
Pressure
Maximum
Gas Supply
Pressure
Type of Appliance
Operation
Exhaust System
Approved Gas Type
Electrical
Consumption
Hot water capacity, (50°F rise)
Hot water capacity, (35°F rise)
Default Temperature Setting (no controller)
Maximum Temperature Setting
Minimum Temperature Setting
Weight
Noise level
Efficiency Rating
Automatic Frost Protection - Bi-Metal Sensor & Anti-Frost Heaters
Combustion Fan RPM Check - Integrated Circuit
150 PSI
Non-Polarized Two Core Cable
0.6 to 5.3 GPM
0.6 to 5.3 GPM
Direct Vent - Forced Combustion
Natural Gas or Propane - Ensure unit matches gas type it's being installed on.
0.6 to 6.5 GPM
0.6 to 8.5 GPM
Temperature controlled continuous flow gas hot water system.
104°F 140°F 104°F 140°F
Controller Default Temperature Setting
V2532FFUC
V2532FFUCD
V2520FFU
V2520FFUD
V2520FFUC
V2520FFUCD
2
Rinnai America FF Models
SPECIFICATIONS
NOTE: Rinnai is continually updating and improving products, therefore, specifications are
subject to change without prior notice. Local, state, provincial and federal codes must be adhered
to prior to installation.

3
Rinnai America FF Models
WHAT IS COVERED?
This Warranty covers any defects in materials or workmanship when the product is installed and
operated according to Rinnai written installation instructions, subject to the terms within this limited
warranty document. This Warranty applies only to products that are installed by a state qualied
or licensed contractor. Improper installation may void this Warranty. Rinnai strongly suggests
that you use an installer who has attended a Rinnai product knowledge class before installing
this water heater. This Warranty extends to the original purchaser and subsequent owners, but
only while the product remains at the site of the original installation. This Warranty only extends
through the rst installation of the product and terminates if the product is moved or reinstalled at
a new location.
HOW LONG DOES COVERAGE LAST?
Item Period of Coverage
Commercial Residential
Heat Exchanger 5 Years* 10 Years*
All other Parts and
Components 5 Years* 5 Years*
Reasonable Labor 1 Year
*Important
Period of coverage is 3 years from date of purchase when used as a circulating water heater
within a hot water circulation loop, when the water heater is in series with a circulation system
and all circulating water ows through the water heater.
WHAT WILL RINNAI DO?
Rinnai will repair or replace the product or any part or component that is defective in materials
or workmanship, except as set forth below: Rinnai will pay reasonable labor and shipping costs
to repair the product. All repairs must be performed using genuine Rinnai parts. All repairs or
replacements must be performed by an individual or servicing company that is properly trained,
state qualied or licensed to do this type of repair.
Replacement of the product or replacement of the heat exchanger may be authorized by Rinnai
only. Rinnai does not authorize any person or company to assume for it any obligation or liability
in connection with the replacement of a product or heat exchanger. If Rinnai determines that
repair of a product is not possible, Rinnai will replace the product with a comparable product, at
Rinnai’s discretion. If a component or product returned to Rinnai is found to be free of defects in
material or workmanship, or damaged by improper installation or damaged during return shipping,
the warranty claim for product, parts and labor may be denied.
Warranty031705COMM-V2
LIMITED WARRANTY
Rinnai Water Heater

4
Rinnai America FF Models
HOW DO I GET SERVICE?
Simply contact a qualied Service Dealer or Installer for the repair of products under this Warranty.
Failure to use a qualied Service Dealer or Installer to provide repair service may void the
Warranty. For the name of the qualied Service Dealer or Installer nearest you, please contact
the company that installed the water heater, or;
• Your local HVAC/plumbing dealer, gas service technician or place of purchase
• Visit the Rinnai website www.rinnai.us
• Call Rinnai at 1-800-621-9419 or write to Rinnai, 103 International Drive, Peachtree City, Georgia
30269
Proof of purchase is required to obtain warranty service. You can show proof of purchase with a
dated sales receipt, by completing and mailing the enclosed Warranty registration card within 30
days of purchasing the product or by registering online at www.rinnai.us . Please complete the
Warranty registration either online or mail it to Rinnai at the address shown on the card.
Receipt of warranty registration by Rinnai will constitute proof-of-purchase for this product.
However, Warranty registration is not necessary in order to validate this Warranty.
WHAT IS NOT COVERED?
This Warranty does not cover any failures or operating difculties due to accident, abuse, misuse,
alteration, misapplication, acts of God, improper installation, improper maintenance or service,
inadequate water quality, scale buildup, freeze damage or for any other causes other than defects
in materials or workmanship. This warranty does not apply to any product whose serial number or
manufacture date has been defaced. This Warranty does not cover any product when used as a
pool or spa heater. (See Water Quality in Care & Lime Section.)
Rinnai is not liable for any special, incidental, indirect or consequential damages that may arise,
including damage to person or property, loss of use, failure to install drain pan under unit, or
inconvenience. Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation may not apply to you.
LIMITATION ON IMPLIED WARRANTIES
Any implied warranties of merchantability and tness arising under state law are limited in duration
to the period of coverage provided by this limited Warranty, unless the period provided by state law
is less. Some states do not allow limitations on how long an implied Warranty lasts, so the above
limitation may not apply to you.
This Warranty gives you specic legal rights, and you may also have other rights which vary from
state to state.
Warranty031705COMM-V2
LIMITED WARRANTY
Rinnai Water Heater

5
Rinnai America FF Models
CONTENTS
Specications................................................................................2
Limited Warranty........................................................................3,4
Owner’s Installation Information ...................................................6
Features of Your New Water Heater............................................7
Safety Issues ................................................................................8
Basic Operation ............................................................................9
About Hot Water.........................................................................10
Scalds-First Aid...........................................................................10
General Controller Information ................................................... 11
Remote Controller Operation......................................................12
Deluxe Controller.................................................... 13,14,15,16,17
Controllers Set Pattern/Temperature Tables...............................18
Error Messages .....................................................................19,20
Maintenance & Service Information ......................................21,22
Trouble Shooting and Common Questions ................................23
For Your Safety Read Before Operating ....................................23
Operating Instructions.................................................................24
Care & Lime Condition Warning ...............................................24
Installer’s Instructions ...........................................................25-50

6
Rinnai America FF Models
OWNER’S INSTALLATION INFORMATION
All Rinnai water heater(s) MUST be installed by a state qualied or licensed
contractor. Failure to comply with state and local codes pertaining to water
heater installations may void the warranty on your new water heater(s). It is
the responsibility of the person having the water heater installed to ensure
the installing contractor has proper licences and permits for installing
water heater(s) in your location. In addition to licensing and permits, Rinnai
encourages all installing contractors to attend a product knowledge class
before installing any of our water heaters to help insure maximum customer
satisfaction and maximum warranty coverage. Failure to comply with state
and local codes may result in non-compliance and may void the warranty of
the water heater(s).
This appliance must be installed in accordance with local codes, or in the ab-
sence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or
the CSA B149.1, Natural Gas and Propane Installation Code.
Install this product indoors ONLY, DO NOT install outdoors.
Do Not use this appliance if any part has been underwater. Immediately call
a qualied service technician to inspect the appliance and to replace any
part of the control system and any gas control which has been underwater.
Detailed instructions on the proper installation practices to follow for the
installation of your new hot water heater(s) are included at the back of this
manual.

7
Rinnai America FF Models
F E A T U R E S O F Y O U R N E W WATER HEATER
?The Rinnai Water Heater is one of the most advanced water heaters available.
It supplies hot water continuously at the temperature preset in the unit or at the
temperature set on the optional remote controller(s). Installation of remote controller(s)
are recommended for optimum performance.
?The Rinnai Water Heater never runs out of hot water. While electricity, water and gas
supplies are connected, the Rinnai Water Heater produces hot water whenever the hot
tap is open.
?The gas burner lights automatically when the hot water tap is opened, and goes out
when the tap is closed. Ignition is electronic, there is no pilot light. When the hot water
tap is off, no gas is used. You save energy and money with the Rinnai Water Heater.
?The temperature of the outgoing hot water is constantly monitored by a built in sensor. If
the temperature of the outgoing water rises to more than 6 degrees above the selected
temperature (shown on the digital remote control) the gas burner will automatically go
out. The gas burner will re-ignite once the outgoing hot water temperature falls below the
selected temperature.
?Built into the microprocessor of the Rinnai Water Heater is the ability to LIMIT THE
MAXIMUM TEMPERATURE of the hot water supplied by the Rinnai Water Heaters.
Without the connection of a remote controller(s), the Rinnai Water Heater is preset to
deliver water at 120OF (Residential) and 140OF (Commercial).
?Residential Unit: With the remote controller(s) the water temperature is adjustable from
98 to 140OF. The water temperature cannot be set to a temperature other than
120OF without the use of a remote controller unit.
?Commercial Unit: With the remote controller the water temperature is adjustable up to
185OF. The water temperature cannot be set to a temperature other than 140OF
without the use of a remote controller unit.
?Error messages are displayed on the optional remote controller(s), simplifying service
calls.
? The Rinnai Water Heater incorporates a device to minimize temperature uctuations (cold
water sandwich effect) when the water is off, then on again. This effect can be eliminated
by installing the Rinnai Water Heaters with a circulation loop with a small storage tank.
?The sound (noise) level from the Rinnai Water Heaters is very low.
?The Rinnai Water Heater is a very compact direct vented device. It saves valuable oor
and wall space.

HOTHOT
COLD
ON!ON!
100
o
F
140
o
F
S
O
L
V
E
N
T
HOTHOT
COLD
ON!ON!
98 F
o
o
110 F
HOTHOT
COLD
ON!ON!
HOT!
8
Rinnai America FF Models
SAFETY ISSUES
Do not clean remote controller(s) with
solvents. Use a soft damp cloth.
The water temperature can only be adjusted
between 98°F and 110°F when the hot water
tap is open, and hot water is owing.
Always check water temperature by hand
before entering the shower or bath. The
temperature may have been changed.
Depending on the weather conditions and
the length of the pipe between the Rinnai
Water Heater and the tap in use, there may
be a variation between the temperatures
displayed at the remote controller(s) and the
temperature of the water at the tap.
The Rinnai Water Heater controls the water
temperature automatically. To do this, it
sometimes needs to change the water ow
accordingly. The water ow from the hot water
tap may vary after the selected temperature at
the remote controller(s) is altered. The water
ow may also vary from summer to winter, as
incoming water temperatures differ.
The vent/air intake should be positioned away
from ammable materials, trees, shrubs, etc.
Do not connect vent to natural draft vents
or fireplaces, this unit can only be used
with an approved Rinnai/Ubbink vent kit and
components. Do not vent unit into other
rooms. Vent terminal must be outside.
Summer 60°F
Incoming water
Winter 40°F
Incoming water

HOTHOT
COLDCOLD
ON!ON!
NOTE: TEMPERATURE CANNOT BE
ADJUSTED EXCEPT BETWEEN 98°F AND 110
°F WHEN ANY HOT WATER TAP IS OPEN. NOTE: CHECK LOCAL CODES FOR
THE MAXIMUM WATER TEMPERATURE
SETTING ALLOWED WHEN USED IN
NURSING HOMES, SCHOOL, DAY CARE
CENTERS, AND ALL OTHER PUBLIC
APPLICATIONS.
NOTE: If a newly installed unit has not
been powered for at least six hours then
the temperature will return to the default
setting if power is interrupted.
CHECK WATER
TEMPERATURE BEFORE
ENTERING SHOWER OR
BATH.
There is a hot water
scald potential if the
thermostat is set to high.
9
Rinnai America FF Models
BASIC OPERATION
To operate the Rinnai Water Heater
simply turn any hot water tap on.
This will automatically light the burner
providing hot water at the preset
temperature. If the optional remote
controller(s) have been installed, the
red “IN USE” indicator will glow on
all remote controller(s).
Adjusting Temperature
1
To take control of the Rinnai Water Heater
all hot water taps must be closed. Press
the "Priority button" on the Controller you
want to set the temperature with, and
the green "Priority" indicator light will
The outlet water temperature of the Rinnai
Water Heater can only be adjusted by
the user using the remote controller(s).
To adjust the setpoint temperature of
the Rinnai Water Heater, all hot water
taps must be closed, and all circulating
pumps turned off (where applicable). The
temperature displayed on this remote
controller will also be displayed on all
other remote controller(s).
3 Simply press the or button
until the required temperature is
displayed on the Digital Monitor.
2
glow. This indicates that the Rinnai Water
Heater is ready to supply hot water at
the set temperature as soon as a tap is
opened.
Note: Rinnai Water Heater will not provide
hot water instantly at the hot water
xtures. Any cold water existing in the hot
water lines must be purged rst.
4

10
Rinnai America FF Models
ABOUT HOT WATER
Hot Water Is Dangerous, especially for the young and the elderly or
the inrm. The Rinnai Water Heater allows you to precisely control the
temperature of your hot water, ensuring safe hot water temperatures.
Water Temperatures over 125°F can cause
severe burns instantly or death from scalds.
Hot Water can cause rst degree burns with
exposure for as little as:
3 seconds at 140 °F
20 seconds at 130 °F
8 minutes at 120 °F
Test the temperature of the water with your
elbow before placing a child in the bath or
shower.
Do not leave a child or an inrm person in
the bath unsupervised.
Scalds-First Aid
1) Remove clothing; Remove all wet clothing, quickly. Wet clothing retains the heat.
2) Apply cold water for 30 minutes; Immediately submerge the burnt area in cold
water for 30 minutes to reduce the heat in the skin, preventing deeper burning.
Never use butter, oils or ointment to cover the burn. They may retain the heat.
3) Keep the scalded person warm; Place a blanket around the person.
4) Seek Medical Advice; Call your medical advice hotline and describe the scald,
follow their directions.
BURN

11
Rinnai America FF Models
GENERAL CONTROLLER INFORMATION
The controller(s) for the Rinnai Water Heater allow the customer to control the functions of the
water heater and to diagnose certain fault conditions
REMOTE CONTROLLERS IDENTIFICATION
MC-91-1US (comes with the unit)
MC-100V-1US (optional)
BC-100V-1US (optional)

12
Rinnai America FF Models
R E M O T E CONTROLLER OPERATION
DIAGNOSTIC USE OF CONTROLLER
1. To Display Maintenance Codes: Press ‘On/Off’ button. To sequence through stored
maintenance codes, press ‘On/Off’ followed by the thermostat button.
2. To Display Water Flow through water heater: Press thermostat button, hold
for 2 seconds and simultaneously press ‘On/Off’ button.
3. To display Outlet Water Temperature: Press ‘thermostat button’, hold for 2
seconds and simultaneously press ‘On/Off’ button.
Digital Monitor
Indicates the selected water
temperature. Error messages
ash in the event of a failure.
Thermostat
Increases or decreases
the desired water
temperature.
In Use Indicator
Indicates that a hot water tap
is open and that control of the
temperature has been taken at
another controller.
ON/OFF
Used to switch the
water heater on and off
Priority
Pressing takes control
of the water temperature
by this controller only
when all taps are off.
Priority Indicator
Indicates whether this
controller has priority
control over the water
temperature
MUTE
To eliminate the beeping sound, press and hold and button
simultaneously until a ‘beep’ is heard (approximately 5 seconds).
TO CHANGE TEMPERATURES FROM OF to OC
1. Press and hold ‘On/Off’ button for 5 seconds while water heater is OFF.
2. To change back from OC to OF, please repeat step 1.

NOTE: With power interruption, water heater will automatically default to the ON position to
provide hot water.
Digital Monitor
Indicates the selected water
temperature. Error messages flash
in the event of a failure.
ON/OFF
Used to switch the water heater on
and off.
Priority
Pressing takes control of the water
temperature by this controller only
when all taps are open.
Function
Enables the user to set the clock
and sound volume functions.
Thermostat
Increases or decreases the desired
water temperature.
In Use Indicator
Indicates that a hot water tap is open
and that control of the temperature is
taken at another controller.
Water Temperature Indicator
Indicates the selected hot water
temperature.
Clock
12 Hour AM / PM clock. In the event
of a fault, codes for error messages
will flash here.
Call
Allows user to contact another
controller. Can be used as a
communication channel for errands
or in emergency situations.
In Use Indicator
Indicates that a hot water tap is open and that control
of the temperature is taken at another controller.
Priority
Pressing takes control of the water
temperature by this controller only
when all taps are off.
Call
Allows user to contact another
controller. Can be used as a
communication channel for errands
or in emergency situations.
Clock
12 Hour AM / PM clock. In the event
of a fault, codes for error messages
will flash here.
Thermostat
Increases or decreases the desired
water temperature.
Sound Volume
Used to select the voice prompt
volume.
Water Smart / Bath Fill Indicator
Used to select Water Smart / Bath Fill Function.
ON/OFF
Used to switch the water heater on
and off.
Water Smart / Bath Fill
Used to select Water Smart / Bath
Fill Function.
Power Save
Indicates that the remote is in the
energy saving mode.
Water Volume
Used to select Water Smart / Bath
Fill volumes.
13
Rinnai America FF Models
DELUXE CONTROLLER
ABOUT THE DELUXE CONTROLLER (MC-100V-1US)
ABOUT THE THE DELUXE BATHROOM CONTROLLER (BC-100V-1US)
DELUXE BATHROOM CONTROLLER

HOTHOT
COLDCOLD
ON!ON!
NOTE: TEMPERATURE CANNOT BE ADJUSTED EXCEPT BETWEEN 98°F AND 110°F
WHEN ANY HOT WATER TAP IS OPEN.
14
Rinnai America FF Models
DELUXE CONTROLLER
Setting The Clock (MC-100V Deluxe Controller ONLY)
The clock is a 12 hour AM/PM style display. To set the time, press the ‘Function’ Button twice
within 10 seconds. Press the and Buttons to adjust the time. When you get close to
the time you wish to set, press the button intermittently to avoid going further than the desired
time.
Press the ‘Function’ Button again to complete setting the clock and return to normal operation.
Adjusting Temperature
Simply press the or buttons until the required temperature is displayed on the Digital
Monitor.
To Operate the hot water unit, open any hot water tap. This will automatically light the burner
providing hot water. The ame of the water heater ‘In Use Indicator’ will illuminate on the
Controller.
Once the hot water is running, if the set temperature is either too hot or cold, press the or
buttons until the desired temperature is reached.
Setting The Sound Volume
To do this, press the ‘Function’ Button, the default voice prompt sound volume is medium, each
subsequent press of the and Button will cycle through the available volume settings in
the following order: High Voice - Off Voice (beep) - Off Sound (no beep) - Low Voice - Medium
Voice.

NOTE: Avoid getting water in the speaker as this may cause damage.
NOTE: TEMPERATURE CANNOT BE
ADJUSTED EXCEPT BETWEEN 98°F
AND 110°F WHEN ANY HOT WATER TAP
IS OPEN.
CHECK WATER TEMPERATURE BEFORE USE.
A parent should always check the temperature before a child is placed in contact
with hot water.
15
Rinnai America FF Models
DELUXE BATHROOM CONTROLLER
Setting the Sound Volume
The voice prompt sound volume for all Deluxe
Controller(s) can be set individually. To do
this, press the ‘Sound Vol.’ button. The default
voice prompt sound volume is medium, each
subsequent press of the ‘Sound Vol.’ will cycle
through the available volume settings in the
following order: High Voice - Off Voice (beep)
- Off Sound (no beep) - Low Voice - Medium
Voice.
Adjusting Temperature
Simply press the ‘Hot water temp.’ or
buttons until the required temperature is
displayed on the Digital Monitor.
To Operate the hot water unit, open any hot
water tap. This will automatically light the
burner providing hot water. The red ame of the
water heater ‘In Use Indicator’ will illuminate
on the Temperature Controller.
Once the hot water is running, if the set
temperature is either too hot or cold, press the
‘hot water temp. or buttons until the
desired temperature is reached.

IT IS THE CUSTOMERS RESPONSIBILITY TO MONITOR THE
BATH FILL REMOTE CONTROLLER FUNCTIONS.
Be careful not to overll the bath, an average bath volume is 60 gallons. It is
recommended that when lling a bath for the rst time you should:
= Remain by the bath during the lling process.
= Use a low bath ll volume such as 25 gallons or less.
‘Water Smart / Bath Fill’ button is unavailable with the MSA Controller System.
16
Rinnai America FF Models
DELUXE BATHROOM CONTROLLER
OPERATING THE WATER SMART / BATH FILL BUTTON
The ‘Water Smart / Bath Fill’ button allows a preset water volume and
temperature to be selected and run automatically.
Initial Settings
When you press the ‘Water Smart / Bath Fill’ button, a Shower /
Bath Volume will appear on the indicator. When a deluxe bathroom
controller(s) is rst turned on, the default shower / bath ll volume
is set to 25 gallons. The shower / bath volume can be lowered to a
minimum of 10 gallons or raised to a maximum of 120 gallons.
Programming shower / Bath Volume and Temperature
With the system on, select a Deluxe Bathroom controller(s) and ensure that it currently has
priority, If it does not have priority, press the ‘Priority’ button once and the ‘Priority’ button will
illuminate.
To select the desired delivery temperature, use the
‘Temp.’ or buttons.
The selected temperature will be displayed on the
bathroom controller monitor and will remain as the
default temperature until it is changed.
To select the volume of water to be used by the
shower / bath, use the ‘Water Vol.’ or buttons.
The selected volume is displayed at the Right of the
controller monitor numerically.
When lling a bath for the rst time, it is recommended
that a low bath ll volume such as 25 gallons or lower
(if available) be used. During any subsequent bath lls,
the volume can then be adjusted to suit your known
bath volume and / or desired ll level.

HOTHOT
COLDCOLD
ON!ON!
HOTHOT
COLD
ON!OFF! COLD
17
Rinnai America FF Models
DELUXE BATHROOM CONTROLLER
Using Water Smart/ Bath Fill
Press ‘Water Smart / Bath Fill’ button once. The ‘Water Smart / Bath
Fill’ button will illuminate and a tone will sound. The ‘Bath’ indicator
will also be displayed in the kitchen Controller monitor (Deluxe Models
ONLY).
The voice prompt will say “The hot water system is ready. Open the
hot water tap”.
Open the hot water tap for the relevant shower or bath.
The ‘In Use’ indicator will illuminate at all Deluxe Temperature
Controller(s) and the shower will run or the bath will start to fill.
To Stop Water Smart / Bath Fill Operation
If you wish to stop the water flow whilst the ‘Water Smart / Bath Fill’
button is in operation, simply press the ‘Water Smart / bath Fill’
button. The ‘Water Smart / Bath Fill’ button will flash and the
voice prompt will say “Hot water is not available. Turn off all hot
water taps, and push the Bath Fill button”. Follow the voice prompt
instructions.
When Water Smart / Bath Fill Operations Finishes
Once the Water Smart / Bath fill operation finishes, the following
events will occur:
1. The flow from the shower / bath hot water tap will cease.
2. The ‘Water Smart / Bath Fill’ button will flash.
3. The Kitchen Controller ‘Bath’ indicator will flash (Deluxe Models)
4. A tone will sound.
5. The voice prompt will say “Bath fill is complete. Turn off the
bath hot water tap, and push the Bath ll button.”
Follow the voice prompts instructions. Note that the
hot water unit will not allow hot water to ow from any
xture until the ‘Water Smart / Bath Fill’ button has been
changed.
6. The ‘Water Smart / Bath Fill’ button light on
the Bathroom Controller and the ‘Bath’ indicator
on the Kitchen Controller monitor will go out.
COMBINING CONTROLLERS AND DELUXE CONTROLLERS
Controller and Deluxe Controller can be combined and will function as
described in other sections of this manual. Refer to the table on page 18

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REU-V2532FFU / REU-V2532FFUD
REU-V2520FFU / REU-V2520FFUD
REU-V2520FFUC / REU-V2520FFUCD
REU-V2532FFUC / REU-V2532FFUCD
(°F)
(°F)
(°F)
5
8106
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04938373
erutarepmet
Water Smart / Bath Fill Temperature Table
water smart/
bath fill temperature 02181161141121101180160140120100189
Approx.
temperature
(°F)
(°C) 948
4
746
44
43
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04
938373
erutarepmet
18
Rinnai America FF Models
CONTROLLERS SET PATTERN/TEMPERATURE TABLES
Temperature controllers allows precise temperature control by the user. When used correctly,
the hot water unit will deliver the selected temperature, even when the water ow is varied,
or more than one tap is in use. Each Temperature Controller can be individually programmed,
however the water heater unit can only deliver one set temperature at any time. The available
temperatures (OF) are as follows:
Suggested temperatures are:
Kitchen 120OF, Shower 98OF - 110OF, Bath ll 102OF - 114OF
These temperatures are suggestions only. You may nd higher or lower temperatures more comfort-
able. Maintaining lower temperatures helps save energy. To obtain water temperatures lower than
98OF, simply add cold water.
Deluxe Controllers are an optional extra. ‘Controller’ and ‘Deluxe’ Controllers can be installed togeth-
er. Controllers allow temperature selection only. ‘Deluxe’ Controllers have temperature selection, bath
ll and clock functions.
Controllers allow the water temperature to be set from the various locations where they are
installed. The temperature selected will be available to all outlets. Below are the combination of
Controllers that are offered by Rinnai:
**See controller manual in controller carton box for more infomation detail.
Water Smart / Bath
Fill temperature cannot
exceed 120 OF for the
following commercial
models with no by-pass:
REU-V2520FFUC
REU-V2520FFUCD.
Temperature Table by Models
Controllers Combination Pattern

Error
02
03
10
11
12
Faulty
No burner operation during
freeze protection mode
Power interruption during
Bath fill (Water will not flow
when power returns).
Air Supply or Exhaust
Blockage
No Ignition
Flame Failure
Remedy
Service Call
Turn off all hot water taps. Press ON/OFF twice.
Ensure Rinnai approved venting materials are being used.
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections.
Ensure vent length is within limits.
Ensure condensation collar was installed correctly.
Verify dip switches are set properly.
Check fan for blockage.
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect all MSA controls.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue
outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure proper Rinnai venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect keypad.
Disconnect all MSA controls if installed.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and re-connect all wiring harnesses on unit and PC board.
Check all components for electrical short.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
Failure to remedy faults may result in severe burns, scalds, and/or
death.
19
Rinnai America FF Models
ERROR MESSAGES
The Rinnai Water Heater has the ability to check its own operation continuously. If a fault
occurs, an Error Message will ash on the Digital Dispaly of the Remote Controller. This assists
with diagnosing the fault, and may enable you to overcome a problem without a service call.
Please identify the code displayed when inquiring about service.

Error
14
16
32
33
34
52
61
65
71
72
LC
(00)
No
code
Faulty
Thermal Fuse
Over Temperature Warning
Outgoing Water
Temperature Sensor Fault
Heat Exchanger Outgoing
Temperature Sensor Fault
Combustion Air Temperature
Sensor Fault
Modulating Solenoid Valve
Signal Abnormal
Combustion Fan Failure
Water Flow Servo Faulty
(Does not stop flow properly)
SV0, SV1, SV2, and SV3
Solenoid Valve Circuit Fault
Flame Sensing Device Fault
Scale Build-up in Heat
Exchanger (when checking
maintenance code history
“00” is substituted for “LC” )
Nothing happens when
water flow is activated.
Remedy
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches are set to the proper position.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to scale build up. Refer to
instructions in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Replace sensor.
Check for restrictions in air flow around unit and vent terminal.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build up.
Ensure fan blade is tight on motor shaft and is in good condition.
Replace sensor.
Check modulating gas solenoid valve wiring harness for loose or damage terminals.
Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
Water Flow Servo or wiring faulty. Check Water Flow Servo wiring harness connection.
Measure resistance of Water Flow Servo wiring.
If blank screen is present on remote control then the Water Flow Servo has shorted out. Unplug Water
Flow Servo. If remote lights up and unit starts operating then replace Water Flow Servo.
Check wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
Ensure flame rod is touching flame when unit fires.
Check all wiring to flame rod for damage.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for bleed over. Isolate unit from building by turning off hot water line to building. Isolate the
circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your
plumbing.
Ensure you have at least the minimum flow rate required to fire unit.
Ensure turbine spins freely.
Measure the resistance of the water flow control sensor.
Remote control does not light up but you have 12 VDC at the terminals for controls.
20
Rinnai America FF Models
ERROR MESSAGES