Rinnai RS100 Troubleshooting guide

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Condensing Boiler
RS100 Controller Training Program
Training Program #501102A –
062311

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Features and Benefits
•Direct communication with the boiler allows it to fire based on the area’s immediate needs
•Operation is controlled by simple rotary push button technology
•Digital display (with backlight):
•Fahrenheit or Celsius
•Ability to display outdoor temperature
•Ability to display supply temperature
•Ability to display system pressure
•Indication of operating capacity (% of Btu)
•Error and warning reporting
•Multiple programming options
•Vacation program
•Three event programs per day
•Three weekly programs
•Summer setback economy mode
•Anti-Legionella programming available for domestic hot water
•Two-wire connection—no battery needed for power
•Integrated battery for memory saves settings during power outage
•Battery will last five years in off mode—it is not used when powered
RS100 –Programmable Wall Thermostat with room setback
•The RS100 connects directly to the boiler and acts as a central thermostat for the entire structure

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Applications for the RS100 Room controller
The RS100 is a room controller and not an on/off room thermostat. It is intended to work only
with Rinnai boilers. When used in conjunction with a Rinnai boiler it will sense the room
temperature and use it to influence the supply water temperature. This will allow less cycling of
the boiler and a more efficient installation. The RS100 is designed to control a single circuit of
heating.
There are two basic applications for the RS100:
•In single zone systems, as a remote boiler display with influence from the room or area where the controller
is installed
•This can be done with only room influence and no outdoor reset influence
•Since the RS100 is constantly reporting room conditions to the boiler, the boiler can still modulate
effectively—constant outdoor temperature reporting is not needed for normal operation (it is still beneficial
for freeze protection)
•The RS100 should be installed in the coldest room
•In multiple zone systems, as a remote boiler display only with no room influence from the controller
•This can be done with or without the room temperature displayed
•This would be considered a 100% outdoor reset boiler where the pump runs continuously and the load is
based solely on the outside temperature
•The RS100 can be installed in any room in this application
Scope of Use

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Scope of Use-
Single Zone System (RC mode)
The RS100 can be used to
control a single heating zone
system. A single heating zone
system has only one loop of
heating. The placement of
the RS100 is very important;
it must be placed in the
coldest room within the single
zone system. If the RS100 is
not placed in the coldest room
there is a chance that the
room will not receive enough
heat and therefore not be
comfortable. The RS100
needs no additional installer
level programming to work for
this installation.

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Scope of Use-
Multiple Zone System (Outdoor Reset mode)
Zone
Thermostats
Third
Party
Controller
Outdoor
Sensor Zone Valve Piping
In this application, the RS100 will allow
the boiler to switch between day and
night outdoor reset curves. The boiler is
then operating with constant circulation
and no input from room thermostats
(on/off) or third party controls. In this
application, a third party relay panel
should be used to control pumps or
zone valves. The panel cannot be
connected to the boiler with an RS100
also connected. Boiler thermostat
terminals 22 and 23 are inactive when
the RS100 is connected.
If multiple zones are used, it is
likely not beneficial to have a
single zone controlling the
boiler’s demand. The RS100
can be used where its room
information does not influence
the boiler’s demand. Its clock
functions are still active as
well as the ability to adjust a
theoretical temperature for
comfort.

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Zone
Thermostats
Third
Party
Controller
Outdoor
Sensor Zone Pump Piping
The boiler in this application is
operating with constant
circulation and no input from
room thermostats (on/off) or third
party controls. The third party
control panel cannot be
connected to the boiler with an
RS100 also connected. Boiler
thermostat terminals 22 and 23
are inactive when the RS100 is
connected.
Scope of Use-
Multiple Zone System (Outdoor Reset mode)

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INSTALLATION
BASICS
THIS IS AN OVERVIEW ONLY—PLEASE REFER TO EACH BOILER OR CONTROLLER
INSTALLATION MANUAL THAT IS SHIPPED WITH THE PRODUCT FOR THE MOST UP TO DATE
INFORMATION. CONTACT RINNAI TECHNICAL SUPPORT IF NEEDED

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Electrical Connections
Below is the connection for the RS100. Please refer to the installation manual and Rinnai’s recommended
application guide for more details or contact Rinnai’s Engineering Department as needed
The RS100 will connect to terminals 20 and 21
•Controller wire should be no longer than 164 ft
•Controller wire should be 18 (AWG) Gauge
•Controller wire should be shielded if near high
voltage (120 V or higher) or if a long distance-the
ground should be connected at the boiler (not at
the controller)
•Mount the controller in the coldest area of the
structure
•Do not mount in direct sun
•Do not mount too close to a heat emitter (where
the emitter could falsely influence the controller)
•Do not mount near lighting that could falsely
influence the controller
Outdoor reset sensor (included with boiler)
connects here. When power is first applied
to the boiler, if the outdoor reset sensor is
not connected, the boiler will not incorporate
any outdoor temperature monitoring
On/Off room
thermostat or
control (no
voltage, dry
contact),
jumping these
points will
cause the
boiler to fire if
there is no
RS100
connected. If
an RS100 is
connected at
terminals 20
and 21, the
boiler will
ignore these
terminals.
Connect the wires to
the back panel of the
controller. Ensure
wire ―A‖ from the
controller is
connected to
terminal 20 (wire
―A‖) on the Boiler.
Ensure wire ―B‖ is
connected to 21.
Release the tab at
the bottom of the
controller to
access the
connection points
Note: If these are swapped the RS100 will
not exit ―Auto Set‖ upon booting.

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BASIC
OPERATION
THIS IS AN OVERVIEW ONLY—PLEASE REFER TO EACH BOILER OR CONTROLLER
INSTALLATION MANUAL THAT IS SHIPPED WITH THE PRODUCT FOR THE MOST UP TO DATE
INFORMATION. CONTACT RINNAI TECHNICAL SUPPORT IF NEEDED

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RS100 Power-on Initialization
The following sequence will occur every time power is reset or the “reset” button on the boiler is pressed
This process takes about 30 seconds
RS100 –Display during initialization
A display test
will occur where
all characters
are illuminated
The selected language will
display.
“GB” = English
If factory defaults are restored to
the controller, this should be
changed to ―GB‖
Pressing the dial will exit the
language display quicker
The current
software version
will display
(Version 2.3 is
current as of
10/09)
Auto set will display for
a few seconds. NOTE:
If the A and B wires are
reversed from the
controller to the boiler,
the controller will not
exit this page