Rinnai CONTINUUM 2424WC User manual

Model2424WC
HowtouseyourNew
ContinuousFlow
CommercialWaterHeater
WARNING: If the information in these instructions is not followed exactly,
a fire or explosion may result causing property damage, personal injury or
death.
-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.
(outdoor unit)

Model 2424WCwww.rinnaiamerica.com 2
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SPECIFICATIONS

Model 2424WC 800-621-94193
SPECIFICATIONS
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Model 2424WCwww.rinnaiamerica.com 4
Rinnai warrants the continuous Commercial Water Heater Model 2424WC, including any parts and
components thereof, to be free from any defects in materials and workmanship for the period specified below,
subject to the terms specified in this warranty. This warranty gives you specific legal rights and you may also have
other rights which vary from state to state.
This Warranty shall apply to the Continuum Continuous Water Heater as follows:
CONDITION AND EXCEPTIONS
Item Type of Failure Covered Period of Coverage
Heat Exchanger Defective Materials or 5 Years from Date of
Workmanship Purchase
All other parts Defective Materials or 5 Years from Date of
and components Workmanship Purchase
In the event of a malfunction, operational difficulty or failure of the product, or any part or any component thereof,
during the warranty term, resulting from defects in materials or workmanship, Rinnai will remedy the malfunction,
operational difficulty, or failure without charge to the owner of the water heater. The remedy will consist of repair
or replacement of the product at the option of Rinnai.
Rinnai will only provide those remedies listed above. The owner shall be responsible for all other costs, including
but not limited to shipping and delivery charges, labor associated with the removal and reinstallation of the prod-
uct or its components, and any other incidental costs such as other materials or permits that may be required for
installation.
This warranty DOES NOT cover any failures, operational difficulty or malfunction due to accident, abuse, misuse, alter-
ation, Acts of God, misapplications, improper installation or improper maintenance or service, lime damage, or from any
other cause other than defects in materials or workmanship. Warranty does not cover use as a pool or spa heater.
PROCEDURE FOR MAKING ACLAIM
In order to obtain the benefits of the warranty, contact your selling dealer or Rinnai at 800-621-9419 for the
location of the servicing dealer nearest you.
Proof of Purchase is required to institute a claim under this warranty. This document does not constitute proof-of
purchase.
LIMITATION ON IMPLIED WARRANTIES
Any implied warranties of merchantability and fitness applicable to the equipment 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.
DISCLAIMERS
Rinnai is not liable for any special, indirect or consequential damages, such as water damage, loss of use, incon-
venience, damage to person or property, whether arising in contract or tort.
Rinnai does not authorize any person or company to assume for it any other obligation or liability in connection
with the sale, application, engineering, installation, use, removal, return or replacement of its product, and no such
representations are binding on Rinnai.
Please DETACH the enclosed warranty registration card, fill it out, and drop it in the mail. Receipt of this
completed card by Rinnai will constitute proof-of purchase for your Rinnai Continuum 2424WC.
WARRANTY

Model 2424WC 800-621-94195
Specifications..............................................................2,3
Warranty ........................................................................ 4
Owner's Installation Information................................... 6
Features of your new Continuum ................................ 7
Safety Issues..............................................................8,9
Basic Operation........................................................... 10
About Hot Water ......................................................... 11
Scalds-First Aid ........................................................... 11
Remote Control Operation ......................................... 12
Error Messages........................................................... 13
Maintenance & Service Information......................14,15
Trouble Shooting and Common Questions............... 16
Operating Instructions............................................17,18
Care & Lime Condition Warning................................ 18
CONTENTS

Model 2424WCwww.rinnaiamerica.com 6
This product must be installed by a Rinnai certified installer. Failure to
have the product installed by a Rinnai certified installer may result in a
voiding of the product’s warranty.
Detailed instructions on the proper installation practices to follow for
the installation of your new continuous hot water heater are included
at the back of this manual.
This appliance must be installed in accordance with local codes, or in
the absence of local codes, the National Fuel Gas Code, ANSI Z223.1
and/or the CAN/CGA-B149, Installation Codes.
Install this product outdoors, DO NOT install indoors.
Do Not use this appliance if any part has been underwater. Immedi-
ately 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 underwater.
For the Rinnai Certified Installer nearest
you call:
1-800-621-9419.
OWNER’S INSTALLATION INFORMATION

Model 2424WC 800-621-94197
)The Continuum 2424WC 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 control. The remote control is recommended for optimum perfor-
mance.
)The Continuum 2424WC never runs out of hot water. While electricity, water and gas
supplies are connected, hot water is available 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 Continuum 2424WC.
)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 optional digital remote control) the gas burner will automati-
cally 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 Continuum 2424WC is the ability to LIMIT THE
MAXIMUM TEMPERATURE of the hot water supplied by the Continuum 2424WC. With-
out the connection of the optional remote control, the Continuum 2424WC is preset to
deliver 120 degree water.
)With the optional remote the water temperature is adjustable from 140°F to 180°F. The
water temperature can be preset at 108, 120, 130, 140, 150, 160, 170 or 180 by a certi-
fied Rinnai technician. If you require a temperature other than 120 or what the remote
will give you, please contact your Rinnai certified technician.
)Error messages are displayed on the optional remote control, simplifying service calls.
)The Continuum 2424WC incorporates a device to prevent the temperature from varying
when the water is off, then on again. It also incorporates a rapid response device for
fast heating.
)The sound (noise) level from the Continuum 2424WC is very low.
)The Continuum 2424WC is a very compact direct vent device. It saves valuable floor and
wall space.
FEATURES OF YOUR NEW CONTINUUM

Model 2424WCwww.rinnaiamerica.com 8
Always check water temperature by hand
before entering a shower or bath. The
temperature may have been changed.
The water temperature can not be adjusted
when a hot water tap is open or when hot
water is flowing through the water heater.
Do not clean Remote Control with
solvents. Use a soft damp cloth. Do not touch the cover or insert objects
into the flue outlet of the Continuum
2424WC.
On cold days steam may be discharged
from the flue outlet, this is normal with a
high efficiency appliance and does not
indicate a fault.
SAFETY ISSUES

Model 2424WC 800-621-94199
Keep flammable materials, trees, shrubs etc.
away from the Continuum 2424WC.
Do not spray water directly into the flue
terminal.
If the external Continuum 2424WC is
disconnected from the power supply and
freezing conditions are expected, turn off
water and gas, and drain all water from
the appliance.
Water Off
Gas Off DRAIN
Drain Water FILTER
Depending on the weather conditions and the
length of the pipe between the Continuum
2424WC and the tap in use, there may be a
variation between the temperatures displayed
at the Remote Control and the temperature of
the water at the tap.
142°F
The Continuum 2424WCcontrols the
water temperature automatically. To do
this it sometimes needs to change the
water flow accordingly. The water flow
from the hot water tap may vary after the
selected temperature at the Remote Con-
trol is altered. The water flow may also
vary from summer to winter, as incoming
water temperatures differ.
Summer
60°F
Incoming
Water Winter
40°F
Incoming
Water
140
SAFETY ISSUES
If power and the automatic frost protection are
connected, freezing will be prevented in conditions
as cold as -30°F.
WATERGAS

Model 2424WCwww.rinnaiamerica.com 10
To operate the Continuum 2424WC simply turn
any hot water tap on, or initiate water flow
through the unit with a circulating pump. This
will automatically light the burner providing hot
water at the preset temperature. If the optional
remote control has been installed, the green IN
USE indicator will glow on the remote control.
AdjustingTemperature 2
The setpoint temperature of the Con-
tinuum 2424WC can only be adjusted by
the user using the Remote Control. To
adjust the setpoint temperature of the
Continuum 2424WC, all hot water taps
must be closed, and all circulating
pumps turned off.
1
Simply press the or button
until the required temperature is dis-
played on the Digital Monitor.
140°F
TEMPERATURE CANNOT BE
ADJUSTED WHEN ANY HOT
WATER TAP IS OPEN, OR
WATER IS FLOWING THROUGH
THE WATER HEATER.
CHECK LOCAL CODES FOR THE MAXIMUM
WATER TEMPERATURE SETTING ALLOWED
WHEN USED IN NURSING HOMES,
SCHOOLS, DAY CARE CENTERS, AND ALL
OTHER PUBLIC USE APPLICATIONS.
Rinnai recommends fixing the water heater
setpoint temperature at 108°F for ALL public use
applications.
BASIC OPERATION
The Remote Control will display the water
heaters current setpoint temperature.

Model 2424WC 800-621-941911
ABOUT HOT WATER
Hot Water Is Dangerous, especially for the young and the elderly or the infirm. The
Continuum 2424WC 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 first 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 infirm 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

Model 2424WCwww.rinnaiamerica.com 12
In Use Indicator
Indicates that a hot water
tap is open. (The setpoint
temperature cannot be ad-
justed when indicator is il-
luminated.)
Digital Monitor
Indicates the selected
water temperature. Error
messages flash in the
event of a failure.
Maintenance Button
Pressing repeatedly shows
sequence of error codes
water heater has experi-
enced.
Thermostat
Increase or decrease
the desired water
temperature.
°F
Set Temperature In Use
Maintenance
Main Controller
MCC - 45 - 3US HC
When the Main Controller MCC-45-3US is used in public use applications,
it should be installed where it can not be adjusted by the public (i.e. a
maintenance room or manager’s office.
endless hot water system
CAUTION: Hotter water increases the risk
of scald injury. Before changing tempera-
ture setting, see instruction manual
REMOTE CONTROL OPERATION
M
DIAGNOSTIC USE OF REMOTE CONTROL
1. To Display Error Codes -- Press Maintenance Button, “M”. To sequence
throuh stored error codes, press “M” followed by the “H” thermostat button.
2. To Display Water Flow through water heater -- Press “H” thermostat but-
ton, hold for 2 seconds and simultaneously press “M” button.
3. To Display Outlet Water Temperature -- Press “C” thermostat button, hold
for 2 seconds and simultaneously press “M” button.

Model 2424WC 800-621-941913
Code
Displayed Fault Remedy
Air Supply or Exhaust Blockage
No Ignition
Flame Failure
Earthing Failure
Remaining Flame Safety Device
Over Temperature Warning
Heat Exchanger Incoming Water
Temperature Sensor Faulty
Outgoing Water Temperature Sensor Faulty
Mod. Solenoid Valve Answer Abnormal
Combustion Fan Failure
Solenoid Valve Driving Circuit Faulty
Flame Sensing Device Faulty
Scale build-up in Heat Exchanger
Check that nothing is blocking
the air intake or exhaust.
Check that the gas is turned
on at the water heater, gas
meter or cylinder.
Check that the gas is turned
on at the water heater and gas
meter. Check for obstructions
in flue outlet.
Service Call
Service Call
Service Call
Service Call
Service Call
Service Call
Service Call
Service Call
10
11
12
14
16
31
32
52
61
71
72
LC Service Call
ERROR MESSAGES
The Continuum 2424WC has the ability to check its own operation continuously. If a fault oc-
curs, an Error Message will flash on the Digital Monitor of the Remote Controls. This assists
with diagnosing the fault, and may enable you to overcome a problem without a service call.
Please quote the code displayed when inquiring about service.
NOTE: Failure to remedy faults may result in severe burns, scalds, and/or death.

Model 2424WCwww.rinnaiamerica.com 14
In the case of any fault or error message from the Continuum 2424WC, first
turn all hot water taps off. Wait for 5 seconds. Turn the hot water tap back on. If
this does not correct the fault or eliminate the error message from the remote
control, press the priority button on and off twice to reset the system. If the error
message still remains, call your RinnaiAuthorized Service Representative or Rinnai
at 800-621-9419.
DO NOT ATTEMPT TO SERVICE YOUR Continuum 2424WC YOURSELF.
Call a Rinnai Authorized Service Technician or call Rinnai at 800-621-9419.
Should overheating occur or the gas supply fail to shutoff, turn off the
manual gas control valve to the appliance.
Warning: Always turn off the electrical power supply, the manual gas valve
and the manual water control valve whenever servicing the unit.
The Continuum 2424WC should be checked by a Rinnai Certified
Technician once a year. A Rinnai Certified Technician should
perform any repairs that may be necessary.
The following items should be checked each inspection:
1) The area around the Continuum 2424WC unit should be free from combustible
materials such as cloth, vegetation and building materials. (see page 9)
2) Check burners for presence of foreign debris.
3) Remove and clean the inlet water filter.
4) Keep the appliance area clear and free from combustible materials, gasoline, and other
flammable vapors and liquids.
5) Do not obstruct flow of combustion and ventilation air.
MAINTENANCE & SERVICE INFORMATION

Model 2424WC 800-621-941915
MAINTENANCE SUGGESTIONS
This water heater has been designed and constructed
for a long performance life when installed and operated
properly under normal conditions. Regular inspections,
as outlined in this section, are strongly recommended
as a means of keeping your heater operating efficiently.
1. Cleaning
The water heater must be cleaned annually.
Keep the water heater clear of dust and debris
especially in and around burner.
Cleaning procedures for the Continuum are as
follows:
1) Turn off and disconnect electrical power. Allow
to cool for one hour.
2) Remove the Front Panel by removing screws.
See parts breakdown on panels.
3) Use pressurized air to remove dust from around
main burner.
4) Use soft dry cloth to wipe cabinet.
DO NOT DAMAGE OR DISTORT ANY
PARTS OF HEATER.
DO NOT USE WET CLOTH OR
SPRAY CLEANERS ON BURNER.
2. Visual check of main burner flames.
The burner must flame evenly over the entire sur-
face when operating correctly. The flame must burn
with a clear, blue, stable flame. See the parts
breakdown of the burner for the location of view
ports. Any and all parts removed for inspection or
service must be replaced before operating the unit.
The flame pattern should be as shown in the fol-
lowing Figures.
* VENT MAINTENANCE
* VENT SYSTEM
Must be checked annually for
blockage or deterioration.
* MAINTENANCE-
ELECTRIC MOTORS
Motors are permanently lubri-
cated and need no lubrication.
Keep fan and motor free of
dust and dirt, clean annually.
MAINTENANCE & SERVICE INFORMATION

Model 2424WCwww.rinnaiamerica.com 16
TROUBLE SHOOTING AND COMMON QUESTIONS
Q- I don't have any hot water when I open the tap!
A- Make sure there is gas and electricity to the Continuum 2424WC.
(the power is turned on and the gas is turned on)
Q- When I was using the hot water, the water got cold!
A- If you adjusted the flow from the tap to lessen it, you may have gone
below the minimum flow required. The Continuum 2424WC requires .6
GPM to operate. If you mix the water with a tap and attempt to get a
temperature well below the temperature being controlled by the unit, it
may drop the flow below .6 GPM. Decrease the temperature supplied
by the Continuum 2424WC at the remote control or increase your
total flow.
Q- White smoke comes out of the exhaust!
A- During colder weather when the exhaust temperature is hotter than
the air, the exhaust fumes condense producing white steam.
Q- When I open a hot tap. I do not immediately get hot water!
A- Hot water must travel through your plumbing from the Continuum
2424WC to the faucet. This can take from 2 to 10 or more seconds
depending upon your plumbing system.
Q- After I turn off the hot water tap, the fan on the Continuum 2424WC
continues to run!
A- The fan is designed to be on for 65 seconds after the flow of water
stops.This is to ensure constant water temperatures during rapid start-
ing and stopping, as well as exhausting any residual gas flue prod-
ucts from the unit.

Model 2424WC 800-621-941917
Warning: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
A. This appliance is equipped with a direct igni-
tion device which automatically lights the
burner. Do not try to light the burner by hand.
B. BEFORE OPERATING: Smell all around
the appliance area for gas. Be sure to
smell below the unit because some gas is
heavier than air and will settle to the
ground.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electric 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.
FOR YOUR SAFETY READ BEFORE OPERATING
•If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to operate remote con-
trol keypad. Do not use tools. Force or
attempted repair may result in a fire or ex-
plosion. If the remote keypad doesn’t work,
call a qualified service technician.
D. Do not use this appliance if any part has
been under water. Immediately call a quali-
fied service technician to inspect the appli-
ance and to replace any part of the control
system and any gas control which has been
under water.
6) Wait (5) minutes to clear out any gas. If
you then smell gas, STOP! Follow “B” in
the safety information above on this label.
If you don’t smell gas, go to next step.
Closed manual valve
(“OFF” position)
Open Manual valve
(“ON” position)
1) STOP! Read the safety information above
before proceeding.
2) Set the thermostat to lowest setting.
3) Turn off all electric power to the appliance.
4) This appliance is equipped with a direct igni-
tion device which automatically lights the
burner. Do not try to light the burner by hand.
5) Turn the manual valve located at gas
inlet of the appliance clockwise
to “OFF”.
OPERATING INSTRUCTIONS

Model 2424WCwww.rinnaiamerica.com 18
FOR YOUR SAFETY READ BEFORE OPERATING
CARE & LIME CONDITION WARNING
7) Turn the manual valve located at the gas
inlet of appliance counterclockwise
to “ON”.
8) Turn on all electric power to the appliance.
9) Set thermostat to desired setting.
10) If the appliance will not operate,
Follow the instructions “To Turn Off
Gas To Appliance” and call your
service technician or gas supplier.
To Turn Off Gas To Appliance
1) Set the thermostat to lowest setting.
2) Turn off all electric power to the appliance if service is to be performed.
3) Turn the manual valve at gas inlet of appliance clockwise to “OFF”
Care of Unit’s Exterior:
Keep the exterior cabinet clean. Use a soft cloth and warm water when cleaning the cabinet.
Do Not use volatile substances such as benzene and thinners, as they may ignite, or cause
fading of the paint.
Lime Condition Warning Signal:
If you notice “LC” flashing on the remote key pad, this means the unit is beginning to lime up,
and MUST be flushed. Contact a qualified Rinnai service technician to flush the appliance.
Failure to flush the appliance when “LC” is flashing, will cause damage to the heat exchanger.
Damage caused by lime build up is not covered by the unit’s warranty.

Installer’sInstructions
www.rinnaiamerica.com
800-621-9419
Warnings....................................................20
Performance Data..........................................21
Locating the Unit.........................................22
Dimensions.................................................22
Recommended Piping for Installation........23
Power Failure Freeze Protection..................24
Gas Piping Sizing Charts.............................27
Gas Piping Notes.........................................28
Water Piping Notes......................................29
Pressure Relief Valve................................29
Electrical Connection Notes.........................30
Wiring Diagram........................................30,32
Lighting the Unit.........................................33
Remote Controls.....................................34,35
Testing........................................................36
Diagnostic Points.......................................37
Schematic Diagram.....................................38
Exploded View..................................39-42
Parts List..............................................43-47
Contents
of Installer’s
Manual
This section is for the Rinnai Certified
Installer only. If you are not certified
you are not authorized to install this
unit. The warranty may be voided due to
installation by a non-certified installer. For
information on becoming a Rinnai Certified
Installer, call1-800-621-9419.

Model 2424WCwww.rinnaiamerica.com 20
This manual must be followed exactly.
1) Read the safety issues completely before installing the Continuum 2424WC.
2) This water heater is suitable for water (potable) heating or space heating.
- The piping connected to the Continuum 2424WC must be approved for use in
potable water systems.
- Toxic chemicals such as those used for boiler water treatment are NOT to be
introduced to the Continuum 2424WC.
- The Continuum 2424WC, if it will be used as a potable water source, it must
not be connected to a system that was previously used with a nonpotable
water heating appliance.
3) The Continuum 2424WC is not suitable for use as a pool or spa heater.
4) The dip switches on the computer board have been preset at the factory and
should not be readjusted without the express knowledge and involvement of
Rinnai.
5) Install the Continuum 2424WC outdoors only.
6) Maintain proper space around the unit for proper servicing and operation.
Minimum clearances from combustible materials are listed below.
Top of Heater 12 inches
Back of Heater 0 inch
Front of Heater 24 inches
Sides of Heater 6 inches
Ground 12 inches
DO NOT install the Continuum 2424WC under an overhang less than 3 feet
from the top of the unit. The area under any overhang greater than 3 feet
must be open on three sides.
7) Installer must install a Pressure relief valve. Pipe pressure relief discharge to a
drain or outside environment (see page 29).
INSTALLER’S INSTALLATION INSTRUCTIONS
-Warnings-