Rinnai EX17 Operation 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.
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.
Owner’s Operation and Installation Manual for the
EX17 (RHFE-433RWTA)
EX22 (RHFE-558RWTA)
Energysaver ®
Gas Direct Vent Wall Furnace
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Table of Contents ........... 2
Safety Information .......... 3
Operating Instructions .... 6
Care and Maintenance ... 22
Fault Codes ....................24
Installation Instructions... 26
Parts List ........................ 45
Consumer Support ......... 54

2Rinnai Corporation EX17 / EX22 Manual
This appliance may be installed in an aftermarket, permanently located, manufactured home
(USA only) or mobile home, where not prohibited by local codes.
This appliance is only for use with the type of gas indicated on the rating plate. This appliance
is not convertible for use with other gases, unless a certified kit is used.
Consumer Safety Information
Safety Definitions ............................................. 3
Safety Behaviors and Practices....................... 3
Safety Features................................................ 4
Specifications
Appliance Specifications ..............................4, 5
Features ........................................................... 5
Operating Instructions
Getting to Know your New Heating Appliance 6
Control Panel ................................................... 7
LED Display ..................................................... 7
Setting the Clock..............................................8
Operating the Heater Manually........................9
Programmable Weekly Timer ........................ 10
Programming the Weekly Timers................... 11
Programming the Weekly Timers (Example) .....
.................................................................12, 13
Weekly Timer Review Function ..................... 14
Your Weekly Timer Program.......................... 15
Factory Pre-set Program................................ 15
Operating the Timers ..................................... 16
Override Function .......................................... 17
Returning to Manual Mode ............................ 16
Frost Protection.............................................. 18
Energy Saving Mode...................................... 19
Function Lock................................................. 20
Humidifier and Air Flow Direction .................. 21
Care and Maintenance................................... 22
Before Making a Service Call......................... 23
Fault Codes....................................................24
Restart Function............................................. 25
Troubleshooting ............................................. 25
Installation Instructions
General Instructions....................................... 26
Gas Connection ............................................. 27
Clearances to Combustibles.......................... 27
Attach Back Covers (Sides only) .................. 27
Flue Terminal Clearances ....................... 28, 29
Dimensions .................................................... 30
Installation Parts ........................................... 31
Drilling Flue Hole ........................................... 32
Flue Manifold Installation......................... 33, 34
Extension Kit Installation ..........................35-38
Connecting the Appliance.............................. 39
Operating Instructions ................................... 40
Cut-Away Diagram......................................... 41
Wiring Diagram .............................................. 42
Ladder Diagram ............................................. 43
Flow Diagram................................................. 44
Parts List................................................... 45-53
Consumer Support
Warranty Information ..................................... 54
Limited Warranty...................................... 54, 55
Table of Contents
This appliance may be installed as an OEM installation in a manufactured home (USA only) or
mobile home and must be installed in accordance with the manufacturer’s instructions and the
Manufactured Home construction and Safety Standard, Title 24 CFR, Part 3280, in the United
States, or the Mobile Home Standard, CAN/CSA Z240 MH Series, in Canada. This appliance
is only for use with types of gas indicated on the rating plate. A conversion kit is supplied with
the appliance.

3
Rinnai Corporation EX17 / EX22 Manual
WARNING
CAUTION
Safety Behaviors and Practices
• Do not block the warm air discharge. Do not allow
anyone to sleep directly in front of the appliance.
• Due to high temperatures, the appliance should be
located out of traffic and away from furniture and
draperies.
• Children and adults should be alerted to the
hazards of high surface temperature and should
stay away to avoid burns or clothing ignition.
• Young children should be carefully supervised
when they are in the same room as the appliance.
• Clothing or other flammable material should not be
placed on or near the appliance.
• Any safety screen or guard removed for servicing
must be replaced prior to operating the appliance.
• Do not insert items into the louvers.
• Do not spray aerosols near the appliance while it is
operating. Most aerosols contain butane gas which
is flammable.
• Do not unplug the appliance while it is operating or
while the fans are on.
• Keep the area around the appliance clear and free
from combustible materials, gasoline, and other
flammable vapors and liquids.
• Never store liquid propane containers indoors.
• Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
• This appliance is equipped with a three-prong plug
for your protection against shock hazard and
should be plugged directly into a properly grounded
three-prong receptacle. Do not cut or remove the
ground prong from this plug.
• Any alteration to the appliance or its controls can
be dangerous.
• Do not operate appliance with the panels removed,
cracked or broken. Replacement of the panels
should be done by a licensed or qualified service
person.
Consumer Safety Information
Safety Definitions
This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and
others.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury. It may also be used to alert against unsafe practices.
DANGER
CAUTION
WARNING
• Wear hand protection when touching the side back
covers, front louver, and rear intake for the
convection fan.
• Do not use bare hands to touch the front louvers
due to high temperatures which may cause burns.

4Rinnai Corporation EX17 / EX22 Manual
)ylnoASU(emohderutcafunamroFnoitacilppA or mobile home or residential installation
convertible for use with natural gas and liquefied petroleum gases (propane /
LPG) when provision is made for the simple conversion from one gas to the
other.
For commercial setting.
For installation at altitudes up to 10,200 feet (3109 m).
General Description Forced combustion, forced convection, flued gas furnace
cinortcelenottubhsuPnoitarepO
Gas Connection 1/2 in NPT
Gas Control Electronic
renrubnesnuBleetssselniatSsrenruB
Temperature Control Electronic thermostat
Ignition System Electronic spark ignition
Flue System The flue must be terminated to atmosphere with only flue components listed
with the appliance’s certification. Warranty will be voided if non listed
components are installed.
Humidifier Tray Capacity - 3 pints (1300 cc)
Electrical Connection AC 120V, 60 Hz, 46 watts (EX17), 51 watts (EX22)
Weight 53 lbs (24 kg)
Noise Level EX17: 33-39 dB , EX22: 33-43 dB
AFUE Rating EX17: Natural Gas: 81.0% Propane: 81.0%
EX22: Natural Gas: 80.0% Propane: 81.0%
Specifications
Rinnai is continually updating and improving products. Therefore, specifications are subject to change without
prior notice.
The efficiency rating of this appliance is a product thermal efficiency rating determined under continuous operating
conditions and was determined independently of any installed system.
Safety Features
• Overheat: The appliance will automatically shut
down when the appliance exceeds a predetermined
temperature.
• Flame Failure: The appliance will automatically
shut down if the burner flame is extinguished.
• Power Failure: The appliance will cut off the gas if
it loses electrical power.
• Power Surge Fuse: A glass fuse on the PC board
protects against overcurrent. If the fuse blows then
all indicator lamps will be off.
• Spark Detector: The appliance automatically
shuts down if there is an abnormal spark at ignition.
• Fusible Link: In case the overheat feature
prevents the temperature from rising then the
fusible link will break shutting off the appliance.
Appliance Specifications

5
Rinnai Corporation EX17 / EX22 Manual
Features
• Restarts automatically when ignition or combustion
fails.
• Clean Heating Forced Flue Type
• Easy Operation One-Touch Ignition
• Sensible Temperature Control Feature
• Comfortable Room Temperature Control and
Display
• Warm Air Outlet at Floor Level (keeps your feet
warm)
• Function Lock
• Room Temperature Setting Memory
• Clean the Air Filter - Indicator Lamp
• Energy Saving Economy Setting
• Humidifier Tray
• Air Flow Directional Louvers
• Direct Vent Easily Installed
• Proportional Heating Variable Capacity
• Hush! Quiet Operation
• Modern Design Minimizes Floor Space
Requirements
• Fault Code Message Display
Natural Gas Propane Gas
Minimum supply gas pressure 3.5 in (89 mm) W.C. 8.0 in (203 mm) W.C.
Maximum supply gas pressure 10.5 in (267 mm) W.C. 13.0 in (330 mm) W.C.
Appliance Specifications
Natural Gas Propane Gas
BTU/hour input Low 8200
High 16700
Low 8200
High 16700
BTU/hour output Low 6560
High 13360
Low 6560
High 13360
EX17
Natural Gas Propane Gas
BTU/hour input Low 8200
High 21500
Low 8200
High 20700
BTU/hour output Low 6560
High 17200
Low 6560
High 16560
EX22

6Rinnai Corporation EX17 / EX22 Manual
VENT TERMINAL
COMBUSTION/
EXHAUST
WARM AIR OUTLET
HUMIDIFIER
REMOVE BOTTOM
COVER AND PULL
OUT TO REFILL
BOTTOM COVER
HOLD BOTH SIDES
AND PULL TOWARD
YOU
THERMISTOR
GAS CONNECTIONS
1/2" NPT
POWER CORD
PLUG 120V AC
COMBUSTION AIR
INTAKE HOSE
EXHAUST PIPE
AIR FILTER
ON/OFF SWITCH
TURNS MAIN POWER
ON/OFF
RATING PLATE
MODEL NUMBER,
SERIAL NUMBER,
GAS TYPE, ETC.
Getting to Know your New Heating appliance
Operating Instructions
DISPLAY
TEMPERATURE/
TIMERS
SETTING CONTROLS

7
Rinnai Corporation EX17 / EX22 Manual
Control Panel
LED DISPLAY
Programming
EcoFrost
Override Auto
Clock Select
Function Lock
ON/OFF
Timers
Timers: used to carry
out timer programming
and confirm all
settings.
Eco: used to select the
Economy mode.
ON/OFF: this is the main on/
off switch for the heater.
Auto: toggles the heater
between AUTO(for timer
operation) and MANUAL
operation modes.
Frost: used to initiate
the Frost mode and
allows for a minimum
frost temperature to
be set.
MODE OPERATION
Clock Set To set current time
and day
Select days of
week, time and
temperature
Set Frost
Protection
temperature
Timer Program
Frost Protection
Override: overrides
the current timer
setting by reversing
the current operation.
Clock: used to set the current
time and day.
Select: When programming the
timers, this button is used to select
and confirm day, time and
temperature settings.
am Set Room Auto
Man
Select
Clock
Frost ON
Override On Off
Program Timer
Temp Review Filter
pm
1 2 3 4 OFF
Mo Tu We Th Fr Sa Su Function Lock
Economy Mode
Days:shows current
day of week or day(s)
being programmed.
Periods:shows
current operating
period or period
being programed.
Review: indicates that
the review mode is on.
Filter:shows when the
filter needs to be cleaned.
Function Lock:
indicates that the
function lock is on.
Clock:shows current
time or pre-set program
time for timer.
Select Program Timer/Temp: indicates when the timers
are being programed-Start time "Select Program Timer"
or Temperature "Select Program Temp".
Temperatures:
shows pre-set and
room temperatures.
Auto/Man: indicates
Manual or Timer
operation mode.
Frost:indicates that the anti-frost mode is on and that
a minimum anti-frost temperature can be entered.
Override On/Off: indicates whether the
Override function is on and whether it has
turned the heater on or off(reverse function).
ON/  : indicates when the heater is
operating and whether the burner is
alight().
Clock:
shows when
the clock is
being set.
Economy Mode:
indicates that the
Economy Mode is on.
The sensible temperature control feature allows
comfortable heating which matches the conditions in
the room.
Based on the information collected by the room
temperature thermistor when the heating starts, the
heating capacity is automatically adjusted to achieve a
comfortable heating effect and to reach the
temperature setting quickly.
Sensible Temperature Control
Up/Down: function
of these buttons
varies depending on
the operating mode.
(refer to the table
below for details).

8Rinnai Corporation EX17 / EX22 Manual
Setting the Clock
1
2
3
4
5
■TO OPEN THE CONTROL PANEL
Lift lightly in the center of the lid. The control
panel lid will then drop backward to an angle.
Note: When the appliance is first
plugged in or after a power failure
longer than 24 hours the display
will show “PF”. And the appliance
will turn on due to the frost protection
function.
■SETTING THE CURRENT TIME & DAY
(This example shows setting the clock to 8:20am on Saturday.)
DAY OF THE WEEK
Press the “Clock” button
once. The day of the week
and is displayed.
Press either of the “▲” or “▼”
buttons until the correct day of
the week is displayed.
Press the “Select” button once
to lock in and complete day of
the week selection. The time of
day will then flash.
TIME OF DAY
To set the time press the “▲”
or “▼” buttons until the correct
time of day is displayed.
Pressing either button once will change the time in single minutes.
Holding button down will change the time rapidly, first in minutes, then in hours.
CONFIRM SETTINGS
Press the “Select”or “Clock”
button once to lock in and
complete setting the time.
The indicators will go out.
Select
Clock
Select
Clock
Select
Clock
Mo
Programming
Clock Select Timers
Select
Clock
Sa
Programming
Clock Select Timers
am
Select
Clock
Sa
Programming
Clock Select Timers
am
Select
Clock
Sa
Programming
Clock Select Timers
am
Sa
Programming
Clock Select Timers
Set Frost

9
Rinnai Corporation EX17 / EX22 Manual
Operating the Heater Manually
1
1
2
3
■To turn the heater ON:
Press the “ON/OFF” button.
Check to see if the “Man” or “Auto”
indicator is displayed:
If the “Auto” indicator is displayed
then press the “Auto” button. The
indicator will change to “Man”.
Go to Step 3.
If the “Man” indicator is displayed
go to Step 3.
Select the desired room temperature
by pressing the “▲” or “▼” buttons.
The heater will start and run for 90 seconds so that it can check the room temperature
(the indicator will show).
If the room temperature is lower than the pre-set or desired temperature the heater will continue to run.
If the room temperature is higher than the pre-set or desired temperature, the heater will go into “stand-
by” mode, and will start when the room temperature falls below the pre-set temperature.
If the heater does not ignite on initial use, this may be due to air remaining in the gas supply line. The
spark generator will only continue for 15 seconds. After this it will be necessary to press the ON/OFF
button OFF, then ON again.
■To turn the heater OFF:
Press the “ON/OFF” button.
DO NOT turn heater off by unplugging the power cord.
The convection fan will continue to run until the appliance cools.
ON/OFF
Set Room Auto ON
pm
1
Tu
EcoFrost
Override
Auto ON/OFF
Set Room
Man
ON
pm
Tu
indicator
indicator
Set Room
Man
ON
pm
Tu
Programming
Clock Select Timers
pm
Tu
EcoFrost
Override
Auto ON/OFF

10 Rinnai Corporation EX17 / EX22 Manual
Programmable Weekly Timer
• The four timer periods create up to four separate operating intervals, each with its own temperature setting.
• These periods can be programmed differently for each day of the week, or for a group of days: weekdays,
weekends, or the entire week.
• The programming covers a 24 hour time span (one day).
The two diagrams below graphically represent examples of weekday and weekend programs.
Weekday Program
• Period 1 has been programmed to start at 5:30 am
with a temperature setting of 76° F. The appliance
will heat the room at 76° F until 8:00 am, when
period 2 starts.
• Period 2 has a temperature setting of “nothing” or
OFF, and so the heater will not operate again until
the start of period 3 at 5:00 pm.
• Period 3 heats the room from 5:00 pm to 9:30 pm
at 72° F.
• Period 4 turns the appliance OFF until Period 1
begins the next day.
Weekend Program
• Period 1 has been programmed to start at 9:00 am
with a temperature setting of 76° F. The appliance
will heat the room at 76° F until 11:00 am, when
period 2 starts.
• Period 2 has a temperature setting of “nothing” or
OFF, and so the heater will not operate again until
the start of period 3 at 4:00 pm.
• Period 3 heats the room from 4:00 pm to 11:00 pm
at 72° F.
• Period 4 has a temperature setting of LOW and
runs the appliance at this setting during the night.
OFF
OFF
72°F
76°F
MIDNIGHT MIDDAY
9:30pm
5:00pm
8:00am
5:30am
1
4
3
2
MIDNIGHT MIDDAY
4:00pm
11:00pm
9:00am
11:00am
1
2
3
4
LOW
72°F
76°F
OFF

11
Rinnai Corporation EX17 / EX22 Manual
Programming the Weekly Timers
am Set Auto
Man
Select
Clock
Frost
Override
Prog
Temp R
1 2 3 4 OFF
Mo Tu We Th Fr Sa Su
35
1
6
7
The following is a general outline of the setting options and procedures avaliable when
programming the weekly timers.
Note: Before programming the current time and day must be set.
The weekly timers can be easily programmed by following the steps illustrated below:
Press the “Timers”
button once to
activate the timer
programming mode.
Repeat steps → for periods 1 through to 4 until you are satisfied with all the settings.
Press the “Timers“ button again to confirm your program and lock in all settings.
Select the day or
group of days you
wish to program by
pressing the “up” and
“down” buttons:
Choose from the
following options:
Mo Tu We Th Fr Sa Su
Mo Tu We Th Fr
Sa Su
or each day of the
week in turn.
If a group of days is
chosen, the times and
temperatures selected
in steps 3 → 5 will
automatically apply
for those days.
Press the “Select”
button to confirm your
choice.
Select the period you wish
to program by pressing
the “up” and “down”
buttons:
Periods 1 → 4 will
automatically appear in
order as you follow this
programing sequence, so
you may not need to
manually select a timer
period.
Press the “Select” button
to confirm your choice.
Set the start time for this
period by pressing the
“up” and “down”buttons:
The time will move up or
down in 10 minute
increments.
Each period must be set
to a later time than the
period before it.
No period can be set
past 11:50 pm, as this is
the end of the 24 hour
program.
Press the “Select”button
to confirm the time.
Set the temperature
you want for this period
by pressing the “up”
and “down” buttons:
Choose from the
following temperature
settings:
H(high, maximum fire)
- - (OFF)
If you want heat during
this period, choose a
temperature.
If you do not want heat,
choose the OFF setting.
Press the “Select” button
to confirm the
temperature setting.
2345
Timers
Select
Select
Select
Select
L(low, minimum fire)
80° F →60° F

12 Rinnai Corporation EX17 / EX22 Manual
Programming the Weekly Timers (Example)
Note: Before programing the timers, the clock must be set to the correct time.
The following is a step by step guide to programing the timers by an example schedule.
If programing is paused for longer than 2 minutes the display will return to the current time,
and all programing up to that stage will be lost.
The times and temperatures in the EXAMPLE box below can be used for learning how to set the programm-
able thermostat.
■EXAMPLE Let's use the following schedule to program the weekdays...
Press the “Timers” button once. The
display will show “Select Program
Timer” and the “Mo Tu We Th Fr Sa Su”
indicators will flash.
1
Press the “▲” button once, the “Mo Tu
We Th Fr” indicators will flash.
2
Press the “Select” button once, the period □
1
indicator will flash and the time and
temperature display will be shown.
3
Press the “Select” button again. The
period □
1indicator will become stable,
the temperature display will go out and
the clock will flash.
4
Press the “▼” button until the display
shows “am5:30”(as shown in the
example schedule for period □
1).
5
Press the “Select” button again. The clock
indicator will become stable, the pre-set
temperature will flash and “Select Program
Temp” will be shown.
6
EXAMPLE SCHEDULE
5:30 am
8:00 am
5:00 pm
9:30 pm
76°F
OFF
72°F
OFF
Time Setting Temperature
Periods
1
2
3
4
Select Program Timer
Tu We Th Fr SuMo Sa
Programming
Clock Select Timers
Select Program Timer
Tu We Th FrMo
Programming
Clock Select Timers
am Set
Select Program Timer
1
Tu We Th FrMo
Programming
Clock Select Timers
am
Select Program Timer
1
Tu We Th FrMo
Programming
Clock Select Timers
am
Select Program Timer
1
Tu We Th FrMo
Programming
Clock Select Timers
am Set
Select Program
Temp
1
Tu We Th FrMo
Programming
Clock Select Timers

13
Rinnai Corporation EX17 / EX22 Manual
Programming the Weekly Timers (Example)
14 73
16 73
Press the “Select” button again. Now the
period □
2indicator will flash and the time
and temperature display will be shown.
8
Press the “Select” button again. The
period □
2indicator will become stable,
the temperature display will go out and
the clock indicator will flash.
9
Press the “▼” button until the display
shows “am8:00”(as in the example for
period □
2).
10
Press the “Select” button again. The clock
indicator will become stable, the pre-set
temperature will flash and “Select Program
Temp” will be shown.
11
Press the “▼” button until the
temperature shows “- -” and the “OFF”
indicator is displayed.
12
Press the “Select” button again. The
period 1 indicator will flash and “Sa Su”
will be displayed.
14
Once all timers are programed, Press the
“Timers” button once to save all timer
settings. The display will return to the
current time and the “Set Program Timer”
indicator will go out.
16
Set periods □
3and □ 4following/repeating steps to , and then go to step .
13
You can now program a Weekend schedule by repeating steps to , and then go to step .
15
Press the “▲” button to set the pre-set
temperature to 76°F(remember, we are
using the example schedule).
7
To review all of the programed settings go to “WEEKLY TIMER REVIEW FUNCTION”.
For a description of how to operate the heater with these programed settings, go to “OPERATING THE
TIMERS”.
am Set
Select Program
Temp
1
Tu We Th FrMo
Programming
Clock Select Timers
am
Select Program Timer
2
Tu We Th FrMo
Programming
Clock Select Timers
am
Select Program Timer
2
Tu We Th FrMo
Programming
Clock Select Timers
am Set
Select Program
Temp
2
Tu We Th FrMo
Programming
Clock Select Timers
am Set
Select Program
Temp
2 OFF
Tu We Th FrMo
Programming
Clock Select Timers
am Set
Select Program Timer
1
SuSa
Programming
Clock Select Timers
pm
Mo
Programming
Clock Select Timers
am Set
Select Program Timer
2
Tu We Th FrMo
Programming
Clock Select Timers

14 Rinnai Corporation EX17 / EX22 Manual
Weekly Timer Review Function
1
1
2
This function lets you review all of the programed Weekly Timer settings(times and temperatures)
without the option of adjusting these settings, removing the danger of accidently changing the
program.
This is a quick way to review the Weekly Timer program before operating the timers.
■To enter the Weekly Timer Review mode:
pressed, it will exit this mode and return the previous operation.
Press and hold the “Timers” button
for approximately 3 seconds(an
audible “beep” will be heard).
NOTE:
The Period □
1, “Mo”, time,
temperature, and “Review”
indicators will show.
Press the “ ▲” button repeatedly
to review the Weekly Timer
program.
The four timer periods for each
day of the week will show in turn,
starting with “Mo”(Monday) then
“Tu” etc.
Press the “ ▼” button to go
backwards through the program.
■To exit the Weekly Timer Review mode:
Press the “Timers” button.
Set
Review
1
Mo
Programming
Clock Select
Press and hold.
Timers
Set
1
Tu
Programming
Clock Select
Review
Timers
pm
Tu
Programming
Clock Select Timers
NOTE: If the heater is left in “Timer Review Mode” for longer than 10 seconds without the “ ” or “ ” buttons being
▲ ▼
am
am

15
Rinnai Corporation EX17 / EX22 Manual
Your Weekly Timer Program
Factory Pre-set Program
■Points to consider before writing your program:
When do I want the heater to operate, and what temperature do I want?
When do I not want the heater to operate?
Will I use the same settings for everyday of the week, or do I need a separate program for the weekdays,
and the weekend? Do I need a separate setting for each day of the week?
■Points to remember when writing your program:
The four periods are set within a 24 hour time span.
The start of a new period marks the end of the previous one, so each period only requires a START time.
Period 4 ends with the start of period 1 on the next day.
Each period must be set to a later time than the one before it.
If you want to heat during the period, select a temperature: H(high), 80 →60, L(low).
If you do not want to heat during this period, select the OFF setting.
■Write your own program:
Use the tables below to write your own weekly timer program, then program the timers.
Start Time Temperature or OFF
1
2
3
4
Start Time Temperature or OFF
1
2
3
4
6:00 am
8:30 am
5:00 pm
11:30 pm
72°F
64°F
74°F
64°F
7:00 am
12:00 pm
5:00 pm
11:30 pm
72°F
70°F
74°F
64°F
Start Time Temp or OFF
1
2
3
4
WEEK DAY
Temp or OFF
1
2
3
4
WEEK END
Start Time
The heater comes shipped with a factory set
program(opposite).
If the heater is not set with a new program it will run
according to this program when you operate the
timers.
If the Weekly Timer program settings are erased,
the heater will revert to this program.

16 Rinnai Corporation EX17 / EX22 Manual
Operating the Timers
Returning to Manual Mode
1
1
2
3
■Before operating the timers, please check the following points:
The clock must be set to the current time and day.
If no personal program is entered, the heater will operate according to the the default factory settings.
Press the “Auto” button. The “Auto”
indicator will go out and be replaced
by the “Man”(Manual) indicator.
The heater will now heat depending
on your manual settings.
■Follow the steps below to operate the timers:
Press the “ON/OFF” button. The
“Man”(Manual) and “ON” indicators
will come on as well as the preset
and room temperatures.
Press the “Auto” button. The “Man”(Manual) indicator will be replaced by the “Auto”(Automatic) indicator,
and the current timer period will show.
If the current period has been
programed with a temperature,
the heater will start heating.
If the current period has been
programed with an OFF setting
the heater will not heat during
this period.
The heater will now operate according to the four periods programed into the Weekly Timer.
Set Room
Man
ON
pm
Tu
EcoFrost
Override
Auto ON/OFF
Set Room Auto ON
pm
3
Tu
Set Room Auto ON
pm
4 OFF
Tu
EcoFrost
Override Auto ON/OFF
Set Room
Man
ON
pm
Tu
EcoFrost
Override Auto ON/OFF

17
Rinnai Corporation EX17 / EX22 Manual
Override Function
1
1
2
■This function is used when the heater is in “Auto” mode(timer operation).
■It allows you to “Override” the preset timer setting until the beginning of the next period.
For example, if the heater is ON, pressing the “Override” button will turn it OFF until the next priod. If the
heater is OFF, pressing the “Override” button will turn the heater ON, and allow you to select a
temperature, until the next period.
■To turn on the Override function:
Remember: The Override function is for use in the “Auto”(timer) mode only.
Press the “Override” button.
One of the following will happen depending on the current timer period setting:
■To turn off the Override function:
Press the “Override” button.
Then the heater will return to the operation of the current timer period.
If the current timer
period is ON (heating)
If the current timer
period is OFF
The heater will turn OFF, the
temperatures will display “-”, and the
“Override” and “Off” indicators will light.
The heater will remain OFF until
a. the next timer period, or
b. the Override function turned off
manually(see step below).
Press the “ ▲” or “ ▼” buttons to manually
adjust the pre-set room temperature.
The heater will remain heating until
a. the next timer period, or
b. the Override function turned off
manually (see step below).
The heater will turn ON, the manual
pre-set temperature and room
temperature will show , and the
“Override” and “On” indicators will light.
or
Override
Set Room Auto ON
Override Off
pm
3
Tu
Set Room Auto ON
Override On
pm
3 OFF
Tu

18 Rinnai Corporation EX17 / EX22 Manual
Frost Protection
■This function allows a minimum room temperature to be pre-set, between 38°F and 60°F. Once the
Frost Protection function is selected the appliance will start heating whenever the room
temperature falls below the selected temperature, regardless of timer or manual settings.
The default position is ON. If the power is lost, when it returns, the appliance will turn on due to the frost
protection function.
1
1
2
3
■Follow the steps below to set and operate the Frost Protection:
Make sure the heater is turned OFF.
Press the “Frost” button. The
Frost Protection temperature
and the “Frost” indicator will be
displayed.
Press the “ ▲” and “ ▼”
buttons to select the Frost
Protection temperature.
(Between 38°F and 60°F).
When the “Frost” indicator is displayed the Frost Protection is operating, and will always prevent the
room temperature from falling below the pre-set Frost Protection temperature.
■To turn off the Frost Protection:
Press the “Frost” button. The
“Frost” indicator will go out.
Set Frost
pm
Tu
EcoFrost
Override Auto ON/OFF
Set Frost
pm
Tu
Programming
Clock TimerSelect
pm
Tu
EcoFrost
Override Auto ON/OFF

19
Rinnai Corporation EX17 / EX22 Manual
Energy Saving Mode
30 min
2°F reduction
2°F reduction
30 min
Preset Temperature
1
1
■The Economy mode can only be set while the heater is operating (heating), but once set it will
remain in the system memory until deactivated.
■To turn on the Economy mode:
Note: The Economy Mode may only be set while the heater is operating(heating).
Press the “Eco” button. The
“Economy Mode” indicator will
light.
The Economy Mode now remains in the system memory.
If the appliance is turned off manually, or stops heating as a result of an OFF timer period, the “Economy
Mode” indicator will go out.
Whenever the appliance starts heating again, the “Economy Mode” indicator will light.
■To turn off the Economy Mode:
Note: The Economy Mode can only be turned off while the heater is operating(heating), i.e when the “Economy
Mode” indicator is showing.
Press the “Eco” button. The
“Economy Mode” indicator will
go out.
■Economy Mode: Information
After the room is heated initially the air
temperature may be dropped to a lower level
without affecting comfort. 30 minutes after the
selected room temperature (set manually with
the “ ▲” and “ ▼” buttons or in an On timer
period) is reached, the Economy Mode, if set,
reduces the temperature by 2°F. After another
30 minutes it reduces the temperature by a
further 2°F, effectively saving energy.
The Economy Mode will not operate if the
heater is under capacity for the room size.
Set Room
Man
ON
pm
Tu
Economy Mode
EcoFrost
Override Auto ON/OFF
Set Room
Man
ON
pm
Tu
EcoFrost
Override Auto ON/OFF

20 Rinnai Corporation EX17 / EX22 Manual
Function Lock
■The Function Lock will help to prevent accidental operation of the appliance as well as children from
altering the controls.
1
1
■To activate the Function Lock:
Press the “ ▲” and “ ▼” buttons
at the same time. The “Function
Lock” indicator will light.
■To deactivate the Function Lock:
Press the “ ▲” and “ ▼” buttons
at the same time for approx 2
seconds until a “beep” is heard.
The “Function Lock” indicator will
go out.
NOTE:
The lock can be activated when the heater is ON or OFF.
If activated while the heater is ON, all controls other than the OFF switch will be locked.
If activated while the heater is OFF, then all controls will be locked.
If the heater is turned off while the Function Lock is activated, it cannot be turned on again until the lock
is deactivated.
Deactivating the lock releases the controls.
Set Room
Man
ON
pm
Tu
Function Lock
Programming
Clock Select
At the same time
Timers
Set Room
Man
ON
pm
Tu
Programming
Clock Select
At the same time for 2 seconds
Timers