Rinnai RCB301AN User manual

2 Rinnai Commercial Boiler User Manual
Copyright 2023 Rinnai America Corporaon. Rinnai® is a registered trademark of Rinnai Corporaon
used under license by Rinnai America Corporaon. Rinnai America Corporaon connually updates
materials, and as such, content is subject to change without noce.
If the informaon in these instrucons is not followed exactly, a re or explosion may result
causing property damage, personal injury or loss of life.
• Do not store or use gasoline or other ammable 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
instrucons.
− If you cannot reach your gas supplier, call the re department.
• Installaon and service must be performed by a licensed professional.
WARNING

Rinnai Commercial Boiler User Manual 3
Thank you for purchasing a Rinnai Commercial Boiler. Before operang this boiler, be sure to read
these instrucons completely and carefully to familiarize yourself with the boiler’s features and
funconality.
ANSI American Naonal Standards
Instute
Btu Brish Thermal Unit
CH Central Heang
SOLO Heang only boiler capable of
DHW through an indirect tank
DHW Domesc Hot Water
GPM Gallons per minute
LP Liquid Propane
LWCO Low Water Cut O
NG Natural Gas
PP Polypropylene
PRV Pressure Relief Valve
PSI Pounds per square inch
wc Inches water column
Following is a list of common acronyms and abbreviaons used in this manual:
1. Welcome ...........................................................................................................................3
1.1 Acronyms and Abbreviaons .......................................................................................... 3
2. Safety................................................................................................................................4
2.1 Safety Symbols ................................................................................................................ 4
2.2 Safety Precauons............................................................................................................ 4
3. About the Boiler ................................................................................................................6
3.1 Front View....................................................................................................................... 6
3.2 Boom View.................................................................................................................... 6
3.3 Components.................................................................................................................... 7
3.4 Altude.......................................................................................................................... 10
3.5 Specicaons ................................................................................................................ 11
3.6 Dimensions.................................................................................................................... 12
3.7 Included Accessories ..................................................................................................... 14
3.8 Oponal Accessories ..................................................................................................... 15
4. Operaon........................................................................................................................ 17
4.1 Start-Up Informaon..................................................................................................... 17
4.2 Control Panel................................................................................................................. 18
4.3 Error and Diagnosc Codes ........................................................................................... 40
4.4 Operang Informaon .................................................................................................. 47
5. Maintenance ................................................................................................................... 51
5.1 Owner Maintenance ...................................................................................................... 51

4 Rinnai Commercial Boiler User Manual
Safety alert symbol. Alerts you
to potenal hazards that can
kill or hurt you and others.
Indicates an imminently hazardous
situaon which, if not avoided, will
result in personal injury or death.
Indicates a potenally hazardous
situaon which, if not avoided, could
result in personal injury or death.
Indicates a potenally hazardous situaon
which, if not avoided, could result in minor
or moderate injury. It may also be used to
alert against unsafe pracces.
This manual contains the following important
safety symbols. Always read and obey all
safety messages.
The following precauons apply to the
installer and consumer. Read and follow all
instrucons in this secon.
• Before operang, smell all around the
appliance area for gas. Be sure to smell
next to the oor because some gas is
heavier than air and will sele on the
oor.
• Keep the area around the appliance clear
and free from combusble materials,
gasoline, and other ammable vapors and
liquids.
• Do not store or use gasoline or other
ammable vapors and liquids in the
vicinity of this or any other appliance.
• Combusble construcon refers to
adjacent walls and ceiling and should not
be confused with combusble or
ammable products and materials.
Combusble and/or ammable products
and materials should never be stored in
the vicinity of this or any gas appliance.
• Always check the water temperature
before entering a shower or bath.
If the informaon in these instrucons is
not followed exactly, a re or explosion
may result causing property damage,
personal injury, or death.
• Do not store or use gasoline or other
ammable 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 instrucons.
− If you cannot reach your gas
supplier, call the re department.
• Installaon and service must be
performed by a qualied installer,
service agency or the gas supplier.
• The warning signs in this manual are
here to prevent injury to you and
others. Please follow them explicitly.
WARNING
DANGER
WARNING
CAUTION

Rinnai Commercial Boiler User Manual 5
• Flammable liquids such as cleaning
solvents, aerosols, paint thinners,
adhesives, gasoline and propane must be
handled and stored with extreme care.
These ammable liquids emit ammable
vapors and when exposed to an ignion
source can result in a re hazard or
explosion. Flammable liquids should not be
used or stored in the vicinity of this or any
other gas appliance.
• DO NOT operate the boiler without the
front panel installed. The front panel
should only be removed for service/
maintenance or replacing internal
components.
• BURN HAZARD. Hot exhaust and vent may
cause serious burns. Keep away from the
boiler. Keep small children and animals
away from the boiler.
• Heang supply and return pipes leaving
the boiler can be hot to touch.
• Do not obstruct combuson air to the
boiler.
• This product burns gas to produce heat.
The appliance must be properly installed,
operated, and maintained to avoid
exposure to appreciable levels of carbon
monoxide and the installer is required to
conrm that at least one carbon monoxide
alarm is installed in the living space before
the appliance is put into operaon. It is
important for the carbon monoxide alarms
to be installed, maintained, and replaced
following the alarm manufacturer’s
instrucon and applicable local codes.
Rinnai recommends that every home have
a carbon monoxide (CO) alarm in the
hallway near bedrooms in each sleeping
area. Check baeries monthly and replace
them annually.
• Do not use this appliance if any part has
been under water. Immediately call a
licensed professional to inspect the
appliance and replace any part of the
control system and any manual gas control
valve which has been under water.
• Do not use substute materials. Use only
parts cered for the appliance.
• Should overheang occur or the gas
supply fail to shut o, turn o the manual
gas control valve to the appliance.
• It is strongly recommended that you use a
trained and qualied professional who has
aended a Rinnai installaon training class
to adjust parameter sengs.
• Do not use an extension cord or adapter
plug with this appliance.
• Any alteraon to the appliance or its
controls can be dangerous and will void
the warranty.
• To protect yourself from harm, before
performing maintenance:
− Turn o the electrical power supply by
turning o the electricity at the circuit
breaker. (The boiler controller does
not control the electrical power.)
− Turn o the gas at the gas control,
usually located immediately below the
boiler.
− Turn o the incoming water supply.
Turning o the water for the central
heang system is done at the boiler
system lling staon shut-o valve or
the main water supply to the building.
− Use only your hand to turn the manual
gas control valve. Never use tools. If
the manual gas control valve will not
turn by hand, do not try to repair it;
call a trained and qualied
professional. Force or aempted
repair may result in a re or explosion.
• Proper venng is required for the safe
operaon of this appliance. Failure to
properly vent this appliance can result in
death, personal injury and/or property
damage.

6 Rinnai Commercial Boiler User Manual
The Rinnai Commercial Boiler is a wall-
mounted, gas-fired boiler designed to
provide heating to the building with the
ability to connect an indirect tank for
DHW production.
Topics in this section
• Front View
• Bottom View
• Components
• Altitude
• Specifications
• Dimensions
• Included Accessories
• Optional Accessories
Central
Heating
Supply
Gas
Central Heating
Return
Condensate
Drain
Wi-Fi
Module Reset
Button
Vent
Connections
Piping
Connections
Controller
Figure 2
Figure 1

Rinnai Commercial Boiler User Manual 7
Le Side Internal -
RCB301AN shown
Flue Thermistor
Automac Air Vent
Return Thermistor
Spark Generator
Water Pressure Sensor
Ignion Electrode
Supply Thermistor
Supply Water Pipe
Fan
Flue Pressure
Switch
High Voltage Terminal Strip
Burner Door
Switch
Main Control
Check Valve
7-Inch Touch
Screen Display
Gas Valve
Power Switch
Exhaust
Intake
Flame Rod
(Ionizaon Probe)
16
17
15
12
13
14
11
8
9
10
7
4
5
6
3
2
1
Refer to the next page for a descripon of each component.
Figure 3
Right Side Internal
(Main Control Hidden) -
RCB301AN shown
Thermal Fuse
Heat Exchanger
Return Water Pipe
Condensate Trap
Gas Valve with
Throle Screw
Air/Gas Mixer
Low Voltage
Terminal Strip Cascade Module
25
20
21
22
19
23
24
18
Figure 4

8 Rinnai Commercial Boiler User Manual
Listed below are descripons of each boiler component. Refer to the previous page for component
illustraon.
Item Name Descripon
Return Thermistor A sensor that monitors the water temperature returning into the
boiler.
Automac Air Vent A device used to bleed the air from the heang system.
Spark Generator Applies high voltage through the spark electrode to ignite the
burner.
Water Pressure Sensor A sensor that monitors the pressure in the system and will
disable operaon in case it senses low or high water pressure.
Supply Thermistor A sensor that monitors the boiler outlet water temperature. The control will shut down the boiler in case the temperature exceeds
a certain limit.
Ignion Electrode Provides direct spark to ignite the burner.
Supply Water Pipe A 1-1/4 in. water pipe that supplies hot water from the heat
exchanger to the system.
Fan
Pulls air and gas through the air/gas mixer. Air and gas are pre-
mixed inside of the fan and are pushed into the burner for
combuson.
High Voltage Terminal
Strip Contains connecon points for main power supply and all pumps power.
Flue Pressure Switch A safety device that monitors the pressure in the vent and shuts down the appliance in case of blockage to avoid unsafe
condions.
Flue Thermistor A sensor that monitors the ue gas exit temperature. The control will shut down the boiler if the ue gas temperature gets too hot
to protect the ue pipe from overheang.
Burner Door Switch A switch that will break the control circuit, shung down the
boiler in case the burner door temperature is too high.
Main Control
The integrated controller monitors and controls the system
operaon. The controller responds to internal and external
signals and controls the fan, gas valve, spark generator, and
pumps to meet the heat demand.
Flame Rod (Ionizaon
Probe) Detects and monitors the presence of a ame.
Check Valve
Prevents ue gas back ow into the fan in case of negave
pressure in the boiler room in a power vent installaon. The
check valve also acts as back ow preventer in a common vent
system where mulple units are cascaded.
7-Inch Touch Screen
Display The full-color touch screen allows a user friendly interface with the boiler control.
Gas Valve Power Switch Manually interrupts the power to the gas valve.
Air/Gas Mixer The venturi controls the mixture of air and gas before entering
the burner for combuson.
Low Voltage Terminal Contains connecon points for low voltage input and output
19
16
17
18
15
12
13
14
11
8
9
10
7
4
5
6
3
2
1
Table: Boiler Component Descripons

Rinnai Commercial Boiler User Manual 9
25
20
21
22
23
24
Item Name Descripon
Thermal Fuse A safety device that will stop the boiler operaon in case of unusual
temperature rise.
Heat Exchanger The stainless steel condensing heat exchanger is eciently designed to maximize heat transfer through the coils while providing protecon
against ue gas corrosion.
Return Water Pipe A 1-1/4 in. water pipe that returns water from the system to the heat
exchanger to be reheated.
Condensate Trap
The high eciency heat exchange produces condensate during
operaon. The condensate trap manages the condensate disposal and
the built-in oat prevents ue gases to escape through the condensate
drain.
Gas Valve The zero governor gas valve regulates the gas ow through the venturi
based on sucon from the fan.
Cascade Module Used to establish communicaon between boiler in a cascade system
by connecng them to each other using two conductor 18-20 AWG
shielded wire.
Webserver Card/
Wi-Fi Module
The Webserver Card/Wi-Fi Module (located on boom of boiler)
(Figure 5) allows the installer to remotely monitor the system
operaon, pro-acvely opmize eciency, and aid in troubleshoong.
This card also establishes the communicaon between main control
board and user interface screen.
Boiler Name Plate The ASME name plate (Figure 5) includes the Naonal Board (NB) and
Canadian Registraon Number (CRN) numbers.
Addional Components Not Shown in Images:
Burner The metal ber and stainless steel burner uses premixed air and gas
to provide a wide range of ring rates.
Outdoor Sensor Uses the outdoor temperature to adjust the unit setpoint to provide
greater eciency.
Cascade System
Sensor In a cascade system, the master boiler requires a system supply sensor to operate properly. The locaon of the sensor should be downstream
of the of the boiler connecon in the main system loop.
DHW Sensor/
Aquastat Monitors and controls the temperature of an indirect tank.
26
Webserver Card/
Wi-Fi Module
26
Boom View
Boiler Component Descripons (Connued)
Figure 5
27
27
Boiler
Name
Plate

10 Rinnai Commercial Boiler User Manual
This boiler can operate from sea level up to 10,200 feet [3,109 m]. The table below represents the
de-rates for each model, gas type, and altude. For proper operaon ensure to set the control for
proper gas type and altude. Use the setup, boiler setup page on the boiler screen for proper gas
type and altude sengs. De-rate values are based on proper combuson sengs as
recommended in this manual. For installaon above 2,000  (609 m) in Canada, follow all
applicable local codes and regulaons.
NOTE: See control secon on how to change altude seng from the control panel.
ALTITUDE VENTING:
For all installaons above 2000  (609 m), the venng is reduced from 140 feet to 90 feet.
Air Intake: 90 Feet
Exhaust: 90 Feet
0 - 2000  2001 - 5400  5401 - 7700  7701 - 10200 
Model
NG LP NG LP NG LP NG LP
RCB301AN 0.0 % 0.0 % 0.0 % 0.0 % 5.0 % 13.0 % 15.0 % 24.0 %
RCB399AN 0.0 % 0.0 % 7.0 % 7.0% 16.0 % 20.0 % 23.0 % 27.0 %
NOTE: The values listed on the above table are the total percentage of boiler input de-rate for each
elevaon range.

Rinnai Commercial Boiler User Manual 11
1Maximum gas supply pressure must not exceed the value specied by the manufacturer.
Rinnai products are connually being updated and improved; therefore, specicaons are subject to
change without prior noce.
Table: Specicaons
Model RCB301AN RCB399AN
Appliance Type Condensing Wall-Mounted, Gas-Fired, Heat-Only (Solo) Boiler
Installaon Type Internal (Indoor) Commercial Applicaons
Model Numbers RCB301AN, RCB399AN
Ignion System Direct Electronic Ignion
Gas Types
Natural and Propane
IMPORTANT: Units ship as NG only. Propane Conversion Kits
available as accessory (purchased separately)
Dimensions - w, h, d 19.4 in. x 35.75 in. x 21.8 in. (493 mm x 908 mm x 554 mm)
Weight (Shipping) 194 lb (88 kg) 207lb (94 kg)
Weight (Appliance) 170 lb (77 kg) 183 lb (83 kg)
Heat Exchanger Surface Area 24.6 sq  30.7 sq 
Gas
Consumpon
(Btu/h)
Minimum 30,100 39,900
Maximum 301,000 399,000
Temperature
Seng CH (Minimum - Maximum) 86°F - 180°F (30°C - 82°C)
Indirect Tank
(DHW) 104°F - 176°F (40°C - 80°C)
Water Content 1.8 gal (6.8 lt) 2.2 gal (8.3 lt)
Water Pressure CH Minimum: 14.5 PSI (1 bar) Maximum: 87 PSI (6 bar)
Maximum Allowable Water Pressure (MAWP): 160 PSI (1103 kPa)
PRV 75 PSI (5.2 bar) (Pressure Relieve Valve included with system)
Sound Level 55 dB(A) 56 dB(A)
Electrical Data Normal 133 W 210 W
Standby 10 W
Max Current 6.3 Amps
Fuse 2 x 6.3 Amps
Gas
Supply Pressure1Natural Gas 3.5 in. - 10.5 in. wc (0.87 - 2.61 kPa)
Propane 8.0 in. - 13.5 in. wc (1.99 - 3.36 kPa)
Electric Connecons AC 120 Volts, 60 Hz
Cercaons ANSI Z21.13, CSA 4.9, ASME
Canada CRN Y6325.2C
Warranty Heat Exchanger: 10 Years. All Other Parts & Components: 1 Year.
Reasonable Labor: 1 Year. See the “Rinnai Commercial Boiler
Warranty” for Complete Details
Opons: • Direct Vent
• Non-Direct Vent (Room Air)
Venng
45° elbow is
equivalent to 3 
(1 m).
90° elbow is
equivalent to 6 
(2 m).
Materials PVC, CPVC, PP and Stainless Steel
Vent Size 4 in. PVC/CPVC
Exhaust Vent Run (Min-Max): 10  (3 m) - 140  (43 m)
Intake Vent Run (Min-Max): 0  (0 m) - 140  (43 m)
High Altude • 0-2,000 feet (0-609 m) - 140  (43 m)
• For altudes above 2,000  (609 m), vent length is reduced to 90
 (27 m).

12 Rinnai Commercial Boiler User Manual
Measurements: in. [mm]
Figure 6 Boom view shown
on next page.

Rinnai Commercial Boiler User Manual 13
Measurements: in. [mm]
Condensate Drain
Gas
Connection Connection Size Minimum Pipe Size
Gas 1 in. NPT 1 in.
CH In (CH Return) 1-1/4 in. NPT 1-1/4 in.
CH Out (CH Supply) 1-1/4 in. NPT 1-1/4 in.
Condensate Drain 1 in. NPT 3/4 in.
Venting (Intake & Exhaust) 4 in. PVC/CPVC 4 in.
Table: Connection Sizes
Figure 7
Dimension “A”:
Model RCB301AN:
10.96 [278]
Model RCB399AN:
13.84 [352]
Central Heating
Return
Central Heating
Supply

14 Rinnai Commercial Boiler User Manual
Carefully unpack your boiler system and verify the following contents are included. If any items are
damaged or missing, contact your local dealer/distributor. Do not aempt to use any item that
appears damaged.
• Installaon and Operaon Manual
(this manual)
• User Manual
• Warranty Card
• Addional technical literature in-
cluded inside product box
DOCUMENTATION
WALL MOUNTING BRACKET
(WITH SCREWS)
PART #: 809000198
PRESSURE RELIEF VALVE, 75 PSI
OUTDOOR TEMPERATURE
SENSOR
PART #: 805000097
PART #: 807000224
Figure 8
SPARE FUSES - 2 X 6.3 A
(LOCATED INSIDE OF MAIN
CONTROL COVER)
INTAKE PIPE SCREWS
4.8 X 25 MM SS PANHEAD PH2
(TAPPED TO INTAKE ADAPTER)
PART #: 803000079
PART #: 809000304

Rinnai Commercial Boiler User Manual 15
The following oponal accessories are available for the Rinnai Commercial Boiler.
Neutralizes the condensate
generated by the boiler.
CONDENSATE NEUTRALIZER
PART #: 804000074
Filters and eliminates debris (> 0.5 mm)
from entering the combuson chamber
for indirect venng (room air) piping.
AIR INLET FILTER
PART #: 803000050
In a cascade system the Master boiler
requires a system supply sensor in
order to operate properly. The locaon
of the sensor should be downstream of
the of the boiler connecon in the
main system loop.
CASCADE SYSTEM SENSOR
PART #: 803000051
Provides a standalone mounng
soluon for the Rinnai Commercial
Boiler.
BOILER RACK
PART #: 803000047
GAS CONVERSION KIT
Converts the boiler gas type.
PART #: 803000053 - 301 NG
PART #: 803000054 - 399 NG
PART #: 803000048 - 301 PROPANE
PART #: 803000049 - 399 PROPANE Connued on next page.

16 Rinnai Commercial Boiler User Manual
Oponal Accessories (Connued)
To establish boiler communicaon with
Building Management System (BMS)
through BACnet.
BACNET ADAPTER
PART #: 803000078
To establish boiler communicaon with
Building Management System (BMS)
through LonWorks.
BACNET ADAPTER WITH LONWORKS
PART #: 803000080

Rinnai Commercial Boiler User Manual 17
IMPORTANT
• On inial startup of the system, it is necessary to manually run the pumps from the service
page to remove all air from the system piping and boiler. Failure to properly deaerate the
boiler and system may result in damage to the boiler, which is not covered by the boiler
warranty.
• It can take up to a week before all the air has disappeared from a newly-lled and
pressurized installaon. During the rst week of operaon, noises can be heard which
indicate the presence of air. The automac air vent in the boiler and air separator in the
heang system will remove the air, which means the water pressure will reduce some
during this period; therefore, addional water is necessary to maintain proper pressure in
the heang system. Water pressure needed for operaon:
− The boiler is in normal operaon between 20 - 70 PSI.
− Below 12 PSI and above 87 PSI, the boiler will have error codes (117 or 118 error code
will be present on the controller display) and will not operate. Increasing the heang
system water pressure is necessary for operaon.
− Below 12 PSI, error code 117 will be present on the controller display.
− Above 87 PSI, error code 118 will be present on the controller display.
− The maximum pressure permied inside the heat exchanger is 160 PSI.
− The pressure relief valve supplied with the boiler is rated to 75 PSI.
Topics in this secon
• Start-Up Informaon
• Control Panel
• Error and Diagnosc Codes
• Operang Informaon

18 Rinnai Commercial Boiler User Manual
ITEM DESCRIPTION FUNCTION
1RINNAI The Rinnai logo will return the user to the home page (shown). This page will
provide informaon regarding the boiler operaon.
2SETUP This page will allow the user to adjust and customize parameters, such as outdoor reset curve(s), and others. NOTE: This page should only be accessed by qualied
service technician.
3VIEW The view screen shows the state of the appliance and its internal components (temperature values, switches condion, water pressure, fan speed, and all other
inputs and outputs).
4GRAPH The graph page allows the user to monitor real me system informaon
(temperature, pressure, pump operaon, and fan speed).
5SERVICE In this page allows for a dierent user level selecon by choose user from the dropdown menu and enter a password to access parameters from basic to crical
funcons.
6LEFT PANE This pane provides informaon about boiler internal temperature and pressure. It also incudes date and me. NOTE: Date and me can be changed from the setup
page.
7CENTER PANE
This pane shows informaon about demand, boiler modulaon, error messages,
setpoint, fan speed, and ionizaon current. The center pane changes color to show
the boiler status: Dark Gray - standby; Light Gray - Running; Red - Error Code (hard
lockout), Yellow - Error Code (so lockout); Orange—service reminder
8EXTERNAL This pane shown informaon about external devices connect to the boiler (outdoor
sensor, system sensor, indirect tank sensor/thermostat, pump status, and Wi-Fi ).
❶❷ ❸❹❺
❼ ❽
Table: Home Screen
❻

Rinnai Commercial Boiler User Manual 19
NO. DESCRIPTION FUNCTION
CENTRAL HEATING
1CH-1 Boiler
Temperature Setpoint
This parameter is used to set the boiler supply temperature setpoint for CH-1
manually if an outdoor sensor is not used. When an outdoor reset funcon is
desired use the Outdoor Reset Curve page to set the boiler min and max
temperatures. Range: 86°F [30°C] - 180°F [82°C]; Default: 180°F [82°C]
2CH-2 Boiler
Temperature Setpoint
This parameter is used to set the boiler supply temperature setpoint for CH-2
manually if an outdoor sensor is not used. When an outdoor reset funcon is
desired use the Outdoor Reset Curve page to set the boiler min and max
temperatures. Range: 86°F [30°C] - 180F [82°C]; Default: 180°F [82°C]
3Central Heang Switching On
Dierenal
This parameter is used to set the temperature dierenal when the boiler will
light up the burner. For instance if the boiler setpoint is 180°F [82°C] and this
parameter is set to 20°F [11°C], the boiler will ONLY re when the actual supply
temperature is below 160°F [71°C]. Range: 0°F [0°C] - 36°F [20°C]
DOMESTIC HOT WATER
4DHW Temperature
Setpoint This parameter is used to set the temperature setpoint for the DHW indirect tank. Range: 104°F [40] - 176°F [80°C]; Default: 120°F [49°C]
5DHW Switching On
Dierenal
This parameter is used when a DHW indirect tank is controlled via a sensor. This
parameters sets the temperature dierenal when the DHW tank will call for
heat demand. For instance if the Indirect tank setpoint is 120°F [49°C] and this
parameter is set to 9°F [5°C], the boiler will ONLY acvates the DHW demand
when tank temperature is below 115°F [44°C]. Range: 0°F [0°C] - 36°F [20°C]
6Boiler Supply Temperature Oset for
DHW
When there is a DHW demand, the boiler temperature setpoint will be the DHW
temperature setpoint + this parameter. For instance if DHW temperature setpoint
is 120°F [49°C] and this parameter is set to 36°F [20°C] the boiler supply setpoint
for DHW will be 156°F [69°C]. Range: -4°F [-20°C]—108°F [60°F], Default: 36°F
[20°C]
Table: Setup Page
To access the SETUP page, the control will prompt the user to select the access level and enter
password. The password for Installer is 9419. The technician and Engineer user levels can ONLY
be accessed by a Rinnai employee.
Quick Setup

20 Rinnai Commercial Boiler User Manual
An outdoor sensor is provide with the boiler. The boiler control allows for two customizable out-
door reset curves for each head demand from room thermostats one and two. The graph below
represents outdoor reset curve for heang circuit one. To set the second outdoor reset curve press
on the arrow at the boom right corner of the page. Set the minimum, and maximum boiler supply
temperature along with minimum and maximum outside temperatures to set outdoor reset curves.
The warm weather shutdown is the temperature value at which the boiler will ignore the call for
heat. Use the outdoor reset power icon to enable or disable the outdoor reset curve. When an out-
door sensor is not being used the boiler will operate using the maximum boiler temperature value
set in this table. When the outdoor reset curve is not intended to be used, the boiler setpoint can
be set from the quick setup page and the outdoor reset curve should be disabled. See next page
for outdoor reset temperature guideline.
NO. DESCRIPTION FUNCTION
1Warm Weather
Shutdown (All Circuits)
This parameter is used to set the outside temperature to disable boiler operaon
for central heang due to warm weather. Range: 46°F [8°C] - 86°F [30°C]; Default:
75°F [24°C]
2Enable Outdoor Reset
Curve (All Circuits) This parameter is used to enable or disable the outdoor reset curve funcon. Range: On - O; Default: On
3Boiler Temperature
Minimum (CH-1)
This parameter sets the minimum boiler supply temperature for the outdoor
reset curve. Range: 86°F [30°C] - Boiler Temperature Maximum; Default: 86°F
[30°C]
4Boiler Temperature
Maximum (CH-1)
This parameter the sets the maximum boiler supply temperature for the outdoor
reset curve. Range: Boiler Temperature Minimum - 180°F [82°C]; Default: 180°F
[82°C]
5Outside Temperature
Minimum (CH-1)
This parameter sets the minimum boiler outside temperature for the outdoor
reset curve. Range: -40°F [-40°C] - Outside Temperature Maximum; Default: 5°F
[-15°C]
6Outside Temperature
Maximum (CH-1)
This parameter the sets the maximum outside temperature for the outdoor reset
curve. Range: Boiler Temperature Minimum - Warm Weather Shutdown; Default:
68°F [20°C]