How to use your New
Continuous Flow
Commercial Water Heater
Model 2424WC
(outdoor unit )
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.
SPECIFICATIONS
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Model 2424WCwww.rinnaiamerica.com 2
SPECIFICATIONS
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WARRANTY
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 product 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, alteration, 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 A CLAIM
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, inconvenience, 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.
Model 2424WCwww.rinnaiamerica.com 4
CONTENTS
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
Model 2424WC 800-621-94195
OWNER’S INSTALLATION INFORMATION
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.
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 use this appliance if any part has been underwater. 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 underwater.
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.
DO NOT install indoors.
For the Rinnai Certified Installer nearest
you call:
1-800-621-9419.
Model 2424WCwww.rinnaiamerica.com 6
FEATURES OF YOUR NEW CONTINUUM
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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 performance.
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 automatically go out. The gas burner will re-ignite once the outgoing hot water temperature falls
below the selected temperature.
Built into the microprocessor of the Continuum 2424WC is the ability to LIMIT THE
MAXIMUM TEMPERATURE of the hot water supplied by the Continuum 2424WC. Without the connection of the optional remote control, the Continuum 2424WC is preset to
deliver 120 degree water.
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Model 2424WC 800-621-94197
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 certified 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.
SAFETY ISSUES
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.
Model 2424WCwww.rinnaiamerica.com 8
SAFETY ISSUES
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
WATER
GAS
If power and the automatic frost protection are
connected, freezing will be prevented in conditions
as cold as -30°F.
Keep flammable materials, trees, shrubs etc.
away from the Continuum 2424WC.
Do not spray water directly into the flue
terminal.
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.
140
142°F
Model 2424WC 800-621-94199
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 Control is altered. The water flow may also
vary from summer to winter, as incoming
water temperatures differ.
Summer
60°F
Incoming
Water
Incoming
Winter
40°F
Water
BASIC OPERATION
1
Adjusting Temperature
The setpoint temperature of the Continuum 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.
TEMPERATURE CANNO T BE
ADJUSTED WHEN ANY HOT
WATER TAP IS OPEN, OR
WATER IS FL OWING THROUGH
THE WATER HEATER.
Simply press the or button
until the required temperature is displayed on the Digital Monitor.
2
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.
140°F
The Remote Control will display the water
heaters current setpoint temperature.
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.
Model 2424WCwww.rinnaiamerica.com 10
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.
BURN
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.
Model 2424WC 800-621-941911
REMOTE CONTROL OPERATION
Digital Monitor
Indicates the selected
water temperature. Error
messages flash in the
event of a failure.
Set Temperature
Main Controller
MCC - 45 - 3US
°F
In Use Indicator
Indicates that a hot water
tap is open. (The setpoint
temperature cannot be adjusted when indicator is illuminated.)
Maintenance
M
In Use
C
H
Maintenance Button
Pressing repeatedly shows
sequence of error codes
water heater has experienced.
Thermostat
Increase or decrease
the desired water
temperature.
endless hot water system
CAUTION: Hotter water increases the risk
of scald injury. Before changing temperature setting, see instruction manual
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.
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 2424WCwww.rinnaiamerica.com 12
ERROR MESSAGES
The Continuum 2424WC has the ability to check its own operation continuously. If a fault occurs, 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.
Code
Displayed
10
11
12
14
16
31
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
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
32
52
61
71
72
LC
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
Model 2424WC 800-621-941913
Service Call
Service Call
Service Call
Service Call
Service Call
Service Call
MAINTENANCE & SERVICE INFORMATION
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.
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 Rinnai Authorized Service Represent ative or 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.
DO NOT ATTEMPT TO SERVICE YOUR Continuum 2424WC YOURSELF.
Call a Rinnai Authorized Service Technician or call Rinnai at 800-621-9419.
Model 2424WCwww.rinnaiamerica.com 14
MAINTENANCE & SERVICE INFORMATION
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 surface 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 following Figures.
Model 2424WC 800-621-941915
* VENT MAINTENANCE
* VENT SYSTEM
Must be checked annually for
blockage or deterioration.
* MAINTENANCE-
ELECTRIC MOTORS
Motors are permanently lubricated and need no lubrication.
Keep fan and motor free of
dust and dirt, clean annually.
TROUBLE SHOOTING AND COMMON QUESTIONS
- I don't have any hot water when I open the tap!
Q
- Make sure there is gas and electricity to the Continuum 2424WC.
A
(the power is turned on and the gas is turned on)
- When I was using the hot water, the water got cold!
Q
- If you adjusted the flow from the tap to lessen it, you may have gone
A
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.
- White smoke comes out of the exhaust!
Q
- During colder weather when the exhaust temperature is hotter than
A
the air, the exhaust fumes condense producing white steam.
- When I open a hot tap. I do not immediately get hot water!
Q
- Hot water must travel through your plumbing from the Continuum
A
2424WC to the faucet. This can take from 2 to 10 or more seconds
depending upon your plumbing system.
- After I turn off the hot water tap, the fan on the Continuum 2424WC
Q
continues to run!
- The fan is designed to be on for 65 seconds after the flow of water
A
stops.This is to ensure constant water temperatures during rapid starting and stopping, as well as exhausting any residual gas flue products from the unit.
Model 2424WCwww.rinnaiamerica.com 16
FOR YOUR SAFETY READ BEFORE OPERATING
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.
OPERATING INSTRUCTIONS
If you cannot reach your gas supplier, call
•
the fire department.
C. Use only your hand to operate remote con-
trol keypad.
attempted repair may result in a fire or explosion. 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 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.
Do not use tools. Force or
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 ignition 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”.
Model 2424WC 800-621-941917
Closed manual valve
(“OFF” position)
Open Manual valve
(“ON” position)
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.
FOR YOUR SAFETY READ BEFORE OPERATING
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 & LIME CONDITION WARNING
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.
Model 2424WCwww.rinnaiamerica.com 18
Installer’s Instructions
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, call
1-800-621-9419.
Warnings....................................................20
Performance Data..........................................21
Locating the Unit.........................................22
Dimensions.................................................22
Recommended Piping for Installation........23
Power Failure Freeze Protection..................24
Contents
of Installer’s
Manual
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
www.rinnaiamerica.com
800-621-9419
INSTALLER’S INSTALLATION INSTRUCTIONS
-Warnings-
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).
Model 2424WCwww.rinnaiamerica.com 20
INSTALLER’S INSTALLATION INSTRUCTIONS
CONTINUUM OUTLET FLOW DATA
INSTALLER’S INSTALLATION INSTRUCTIONS
CONTINUUM PRESSURE DROP CURVE
Model 2424WC 800-621-941921
INSTALLER’S INSTALLATION INSTRUCTIONS
Locating the unit
Eve, porche,
or overhang
C
A
B
Flue
C/L
Continuum 2424WC
D
A.......Vertically below an openable window........................................................12”
B.......Vertically above an openable window, door, etc.........................................12”
C.......Below eves, porches, overhangs..............................................................36”
D.......Horizontally from an openable window , door , etc.......................................12”
Height 23 3/4 ”
Width 13 3/4 ”
Window
Door
Vent termination clearances
INSTALLER’S INSTALLATION INSTRUCTIONS
Dimensions
13 3/46 3/4
Side
View
Front
View
3 5/16” (Hot Water)
/4
3
23
Minimum
Centerline of
Cold Water Supply
4 1/4” (Power)
Depth 6 3/4 ”
4 1/8”
2 1/8” (Cold Water)
(Hot)
3 7/16”
(Gas)
Model 2424WCwww.rinnaiamerica.com 22
1 7/8”
(Power)
2 9/16” (Gas)
RECOMMENDED PIPING FOR INSTALLATION
Model 2424WC 800-621-941923
INSTALLER’S INSTALLATION INSTRUCTIONS
OPTIONAL:Power Failure Freeze Protection
Model 2424WCwww.rinnaiamerica.com 24
INSTALLER’S INSTALLATION INSTRUCTIONS
INSTALLATION WITH RECIRCULATION (i.e. Hair Salons, Restaurants, etc.)
Model 2424WC 800-621-941925
INSTALLER’S INSTALLATION INSTRUCTIONS
BACKUP STORAGE INSTALLATIONS (i.e. Hotels, motels and other high flow applications)
Model 2424WCwww.rinnaiamerica.com 26
INSTALLER’S INSTALLATION INSTRUCTIONS
Gas Pipe Sizing Chart
Capacity Table for Natural Gas
cubic feet / hour
(table assumes .3 inch pressure drop, specific gravity of .60)
Nominal Length of Pipe in Feet
Iron Pipe
Size
Inches
10 20 30 40 50 60 70 80 90 100 125 150 175 200
3/4 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 520 350 285 245 215 195 180 170 160 150 130 120 110 100
1-1/4 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
1-1/2 1600 1100 890 760 670 610 560 530 490 460 410 380 350 320
After determining the length of pipe required select the pipe size that will supply the
cubic feet per hour of gas required for the input rating of the Continuum 2424WC.
The formula for figuring the cubic feet per hour required is:
CFH =
*Gas input requirement is on the water heater data plate
*The heating value of the gas can be obtained from the local Natural Gas Utility
(table assumes 11 inches of water column pressure at the inlet, .5 inch drop)
Nominal Length of Pipe in Feet
Iron Pipe
Size
Inches
10 20 30 40 50 60 70 80 90 100 125 150
1/2 275 189 152 129
3/4 567 393 315 267 237 217 196 185 173 162 146
1 1071 732 590 504 448 409 378 346 322 307 275 252
1-1/4 2205 1496 1212 1039 913 834 771 724 677 630 567 511
Gas Input of Continuum 2424(BTU/HR)
Heating Value of Gas(BTU/FT3)
Capacity Table for LP Gas
BTUH of undiluted liquified petroleum gases
Model 2424WC 800-621-941927
INSTALLER’S INSTALLATION INSTRUCTIONS
Gas Piping Notes
1) A manual gas control valve must be placed upon the gas inlet connection to the
Continuum 2424WC before it is connected to the gas line. A union can be used on
the connection of the Continuum for the future servicing or disconnection of the
unit.
2) Check the type of gas and the gas inlet pressure before connecting the Continuum
2424WC. If the Continuum 2424WC is not of the gas type that the building is supplied with, DO NOT connect the water heater. Contact the dealer for the proper unit
to match the gas type.
3) Minimum and Maximum Gas pressures are listed below:
* Minimum value is for input adjustment
Natural Gas: Minimum 7" WC Propane Gas: Minimum 10"WC
Maximum 10.5" WC Maximum 14" WC
WARNING: Conversion of this unit from natural gas to propane or propane to
natural gas CANNOT be done in the field.
4) Always use approved connectors to connect the unit to the gas line. Always purge
the gas line of any debris before connection to the water heater.
5) The Continuum 2424WC must be leak tested before it is placed into operation.
6) After completion of gas pipe connections, all joints including the heater must be
checked for gas-tightness by means of leak detector solution, soap and water, or an
equivalent nonflammable solution, as applicable. Caution: Since some leak test
solutions, including soap and water, may cause corrosion or stress cracking, the
piping must be rinsed with water after testing, unless it has been determined that
the leak solution is non-corrosive.
7) The Continuum 2424WC and its individual shut-off valve must be disconnected
from the gas supply piping system when pressure testing of the gas supply
piping system at test pressures equal to or greater than 1/2 psi.
8) The Continuum 2424WC must be isolated from the gas supply piping system
by closing it's individual manual shutoff valve during any pressure testing of
the gas supply piping system at test pressures less than 1/2 psi.
9) The Continuum 2424WC's Installation location must provide adequate Combustion
and Ventilation airflow.
Model 2424WCwww.rinnaiamerica.com 28
INSTALLER’S INSTALLATION INSTRUCTIONS
Water Piping Notes
1) A manual water control valve must be placed upon the water inlet connection to the
Continuum 2424WC before it is connected to the water line. Unions may be used on
both the hot/cold water supply lines, for the future servicing or disconnection of the unit.
2) All soldering materials and piping must be compatible with potable water.
3) Purge the water line to remove from it all debris and air. Debris will damage the
Continuum 2424WC.
4) There is a wire mesh strainer on the Continuum 2424WC's inlet to discourage the
introduction of debris to the unit. It will need to be cleaned periodically.
DO NOT operate unit without filter in place.
WARNING: DO NOT reverse the inlet and outlet (cold and hot water) connections on
the unit. This would cause the Continuum 2424WCto operate dangerously or not at
all.
INSTALLER’S INSTALLATION INSTRUCTIONS
Pressure Relief Valve
1) ANSI code calls for the addition of an approved pressure relief valve to all water
heating systems.
2) The pressure relief valve must meet the following criteria: The relief valve must
comply with the standard for Relief Valves and Automatic Gas Shutoff Devices for
Hot Water Supply Systems ANSI Z21. 22. This relief valve must be rated at 150
PSI of pressure.
3) The relief valve should be added to the hot water outlet line per manufacturer's
instructions. DO NOT place any other type valve or shut off device between the
relief valve and the hot water heater.
4) The discharge from the pressure relief valve should be piped to the ground or into a
drain system to prevent exposure or possible burn hazards to humans or other plant
or animal life. Water discharged from the relief valve could cause severe burns
instantly, scalds and/or death.
5) Do not plug the relief valve and do not install any reducing fittings or other restrictions in the relief line. The relief line should allow for complete drainage of the
valve and the line.
6) Pressure relief valve must be manually operated once a year to check for correct
operation.
7) Should overheating occur or the gas supply fail to shut off, turn off the manual gas
valve on the Continuum 2424WC.
Model 2424WC 800-621-941929
INSTALLER’S INSTALLATION INSTRUCTIONS
Electrical Connection Notes
WARNING: The Continuum 2424WC must be electrically grounded in accordance with local codes or in the absence of local codes with the most recent edition of the National Electrical Code, ANSI/NFPA 70. In Canada, all
electrical wiring to the Continuum 2424WC should be in accordance with
local codes and the Canadian Electrical Code, CSA C22.1 Part1. Do not rely
on the gas or water piping to ground the metal parts of the water heater.
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation. Verify correct
operation after servicing.
1 The Continuum 2424WC requires 120VAC/60 HZ. Power from a properly
grounded circuit, GFI.
2 An on/off switch must be provided and installed for the incoming 120VAC
power.
3 Wire the Continuum 2424WC exactly as shown in the wiring diagram on the
next page and on the inside of the cover panel. The blue wire is the hot leg
wire; the brown wire is the neutral wire.
4 A green screw is provided in the junction box for the grounding connection.
Ground
ON/OFF
Your disconnect switch should be a type that is suitable for
outdoor use. Check National Electrical Codes for proper type
switch to use in your area.
Model 2424WCwww.rinnaiamerica.com 30
INSTALLER’S INSTALLATION INSTRUCTIONS
Wiring Diagram
Model 2424WC 800-621-941931
INSTALLER’S INSTALLATION INSTRUCTIONS
Wiring Diagram
Model 2424WCwww.rinnaiamerica.com 32
INSTALLER’S INSTALLATION INSTRUCTIONS
Lighting the Unit
WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss
of life.
1) This water heater does not have a pilot. It is equipped with a direct ignition
device which automatically lights the burner. DO NOT TRY TO LIGHT THE
BURNER BY HAND.
2) Before operating the Continuum 2424WC smell all around the unit for gas. Be
sure to smell near the ground as leaking gas may settle there.
3) Turn the manual gas control valve on.
STOP!! READ THE SAFETY ISSUES ON PAGES 8 & 9
4) Turn on any hot water tap. The Continuum 2424WC should light and begin
heating your water.
If the Continuum 2424WCfails to light
1) DO NOT ATTEMPT TO LIGHT BY HAND.
2) Turn off the electrical power to the unit.
3) Turn off the manual gas control.
4) Wait 5 minutes, if you smell gas, go to a neighbor's house and call the gas
company or the fire department. If you do not smell gas, go to the next step.
5) Turn the manual gas control valve on.
6) Turn the electrical power to the unit on.
7) Turn on any hot water tap.
8) If the unit still fails to light, turn off the electricity and gas to the unit and call
Rinnai 1-800-621-9419.
Model 2424WC 800-621-941933
INSTALLER’S INSTALLATION INSTRUCTIONS
Remote Controls- General
The remote control for the Continuum 2424WC allows the customer to control the
functions of the water heater and to diagnose certain fault conditions.
The Main Controller model MCC-45-3US is intended to be installed in the kitchen
or laundry area where the majority of the hot water is being used.
NOTE: The MC-45-3US has a temperature setpoint range of 140-180°F. Other
setpoint temperatures must be set through dip switch settings, Contact
Rinnai at 800-621-9419 for dip switch settings.
Before installing the remote control, determine the most convenient location. When
deciding on the best location for the remote controls, please consider the following
items:
1) Place the controllers out of the reach of small children or unauthorised users.
2) Avoid locations where the controller will become hot. (over a stove, near an
oven or a radiant heater.
3) Avoid direct sunlight. (The digital monitor can be difficult to read in direct
sunlight)
4) Avoid areas where the remote can be splashed with cooking water, oil or
sauce.
5) The remote control cables carry low voltage, 12VDC digital.
NOTE: Only one controller can be connected to one Continuum 2424WC water
heater. (i.e. Installations with two controllers will not function properly.)
Model 2424WCwww.rinnaiamerica.com 34
INSTALLER’S INSTALLATION INSTRUCTIONS
Remote Controls - Installation
1) Determine a suitable location for the
outline of remote
control.
2) Make three holes on the wall as shown.
securing screw
wire hole
(21/32” dia.)
securing screw
1 1/16”
3) Run the cable between the control and
the Continuum 2424WC or the control
and the other control.
Note: Remote Control Dimensions are:
4 3/4” H x 4 3/4 W” x 1” D
4) Remove the face plate from the remote control, using a screw driver.
5) Connect the cable to the remote control.
6) Mount the control to the wall using the holes drilled in step 2.
Note: If the cable cannot be run in the wall cavity, the plastic knockout should be re-
moved from the top or bottom of the control to allow flush mounting with the wall
7) Disconnect the power from the Continuum 2424WC.
3 1/4”
8) Remove the cover of the Continuum 2424WC.
9) Remove the plastic cover from the PCB and electrical connections.
DO NOT ATTEMPT TO CONNECT THE REMOTE CONTROLS WITH THE POWER ON, THERE'S 120 VOLT POTENTIAL, NEXT TO THE REMOTE CONTROL CONNECTIONS INSIDE THE UNIT. All service and wiring should be
performed by a certified installer.
10) Thread the cable through the access hole at the
base of the unit and connect the wires to the control terminals on the right hand side bottom of the
PCB. Note: Connect remote control cable to
location labeled “TERMINAL” in the drawing at
right.
11) Secure the control cable using the clamp provided.
12) Replace plastic cover over PCB and then replace
the cover of the Continuum 2424WC.
TERMINAL
CLAMP
Model 2424WC 800-621-941935
INSTALLER’S INSTALLATION INSTRUCTIONS
Testing
1) Turn on the gas and water.
2) Check for water and gas leaks. Use soapy water to test for gas leaks.
3) Remove pressure test point screw, attach pressure gauge to test point.
4) Turn Power on.
5) Open any hot water tap fully.
6) Check test point or supply pressure in water columns per inch.
Manifold Pressure: Supply pressure:
Natural Gas 5.3" Hi. fire 0.43" Lo. fire Natural Gas Min. 7" Max. 10.5"
LPG 8.7" Hi. fire 0.59" Lo. fire LPG Min. 10" Max. 14"
NOTE: The pressure may be low due to too little flow, too high an incoming tempera-
ture, and/or undersized gas piping. Examine these areas before determining that
the pressure needs to be adjusted. Contact Rinnai before adjusting manifold
pressures at 1-800-621-9419. Failure to contact Rinnai, could void unit’s
warranty.
7) If it is determined that the gas pressure needs adjusting, first check the in
coming pressure at the test point on the gas inlet. If it is correct follow the
adjusting procedure contained in the pouch of the unit EXACTLY. If in doubt
call Rinnai 1-800-621-9419.
The regulator is pre-set at the factory, it should not need resetting.
8) Turn the hot water off. Turn the power off. Remove the pressure guage and
replace the test point screw. Check for a gas leak around the test point
screw.
9) Replace the front cover.
10) Turn the power back on.
11) Check the operation of the unit. Check the operation of each of the remote
controls. Check the operation of the Power failure protection system.
12) Explain the proper operation of the Continuum 2424WC to the customer.
Model 2424WCwww.rinnaiamerica.com 36
INSTALLER’S INSTALLATION INSTRUCTIONS
Diagnostic Points
wolF
trahC
0
N
1J
2H
3C
0
NnoC
4
1
2
4D
5A
6C
7B
8B
2
1
2
3
tnioPtnemerusaeM
roloCeriW
eulaVlamroNtnenopmoC
eulB-nworBV231-801CArotcetorPegruS
kcalB-kcalBV31-11CDlortnoCetomeR
kcalB-deRV31-11CD
kcalB-wolleYV01-2CD
kcalB-etihWV9-2CD
wolleY-deRzH053-06
dnuorGtenibaC-wolleY
V061-001CA
1CDrevo( µ )A
eulavecnatsiserrotsimrehT
ecnatsiseRpmeT
C°51K0.41-4.11 Ω
etihW-etihW
K8.7-4.6C°03 Ω
K5.4-6.3C°54 Ω
K7.2-2.2C°06 Ω
K8.0-6.0C°501 Ω
deR-deR1woleB Ω esuFlamrehT
deR-deR1woleB Ω hctiwStaeh-revO
rosneSwolFretaW
rotoMnaFnoitsubmoC
doRemalF
rotsimrehT
9I
01I
11I
21B
31I
41E
4
1
2
1
3
1
rotcennoCroloCeriWeulaVlamoN
JkcalB-deR
FneerG-neerG
AegnarO-egnarO
yerG-yerGV011-09CArotingI
kcalB-kniP
kcalB-wolleY
kniP-kniP
kcalB-eulB
eulB-deR
yerG-egnarO
V011-09CA
32-91 Ω
V61-21CA
8.4-6.3 Ω
V03-31CA
8.0-6.0 Ω
V001-08CD
K6.1-3.1 Ω
V001-08CD
K1.2-7.1 Ω
V001-08CD
001-06 Ω
V001-08CD
K1.2-7.1 Ω
V31-11CDrotoMderaeG
AyerG-nworB
J
5
AnworB-wolleY
etihW-kcalB
VS(evlaVdioneloS
VS(evlaVdioneloS
evlaVgnitaludoM
VS(evlaVdioneloS
4-2 Ω
)
1
)
2
)
3
42-02 Ω
V05-03CA
V231-801CA
V022-081CA
K3.0-32.0 Ω
Model 2424WC 800-621-941937
INSTALLER’S INSTALLATION INSTRUCTIONS
Schematic Diagram
Model 2424WCwww.rinnaiamerica.com 38
INSTALLER’S INSTALLATION INSTRUCTIONS
Exploded View - Cabinet
Model 2424WC 800-621-941939
INSTALLER’S INSTALLATION INSTRUCTIONS
Exploded View - Internals
Model 2424WCwww.rinnaiamerica.com 40
INSTALLER’S INSTALLATION INSTRUCTIONS
Exploded View - Internals
Model 2424WC 800-621-941941
INSTALLER’S INSTALLATION INSTRUCTIONS
Exploded View - Electrical
Model 2424WCwww.rinnaiamerica.com 42
INSTALLER’S INSTALLATION INSTRUCTIONS
Parts List
Number
001
004
007
012
016
017
018
019
022
023
100
101
Description
Casing Assembly
Heat Protection Plate
Front Panel Assembly
Wall Installation Bracket
Front Panel Packing
Front Panel Packing - Side
Connection Reinforcement Panel
Gas Control Bracket
Cable Connection
Cable Seal Packing
Gas Connection (3/4” NPT)B
Test Point Screw
Part Number
DU195-100-2
BU155-110
DU195-1615-2
BU195-121
BU195-167
AU115-163
BU169-120
BU169-125
BU56-602-N
AU169-126
CU195-211-2
C10D-5
Quantity
1
1
1
2
1
2
1
1
1
1
1
2
103
104
104
106
107
110
111
112
113
114
115
Gas Control Assembly
Manifold Assembly - A (LPG)
Manifold Assembly - B (Nat)
Burner Case Front
Sound Proofing Panel
Side Type Sleeve Burner Assembly
Burner Case Back Panel
Comb. Chamber Front Panel
(Complete Assembly)
Comb, Chamber Front Panel (Assy)
Upper Packing - Comb. Chamber
Lower Packing - Comb. Chamber
C36E-30-S
CU195-200-A
CU195-200-B
DU195-255
CU169-257
B3A1-4
CU169-256
CU195-920
CU195-310
BU195-315
BU195-316
1
1
1
1
1
18
1
1
1
1
1
Model 2424WC 800-621-941943
INSTALLER’S INSTALLATION INSTRUCTIONS
Parts List
Number
116
117
118
119
120
121
125
127
128
129
130
131
Description
Ignition target
Electrode
Flame Rod
Electrode Packing
Electrode Holder
Electrode Sleeve
Heat Exchanger Complete Assy
PCB Bracket
Stop Bracket A
Stop Bracket B
Flue Outlet ( Assy)
Flue Outlet
Part Number
AU168-325
AU168-321
AU168-322
AU195-312
AH43-262
AU102-681
DU-195-1840
AU195-330
AU195-321
AU195-322
BU169-470
BU169-471
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
132
133
150
151
153
154
400
401
402
403
405
408
Flue Outlet Packing
Flue Outlet Packing A
Blower Motor Assy
Fan Casing Assy A
Fan Connection
Fan Connection Packing
Water Inlet ( 3/4” NPT) B
Water Filter Assy
Rectifier
Water Flow Servo & Sensor
120V Anti-Frost Heater
Hot Water Outlet (3/4”NPT) C
BU169-472
AU155-111-1
BU195-565
BU169-552
BU169-555
AU169-656
H73-511
H73-501-2
M8D1-11
M8E-4-4
BU195-1878
BU132-363-C
1
1
1
1
1
1
1
1
1
1
1
1
Model 2424WCwww.rinnaiamerica.com 44
INSTALLER’S INSTALLATION INSTRUCTIONS
Parts List
Number
409
410
415
416
417
418
420
700
701
705
706
708
Description
Plug Band B
Drain
Modulating Solenoid Valve Harness
Fan Motor Harness
Sensor Harness
Water Flow Servo Harness
Flame Rod Harness
PCB
Surge Protector
PCB Front Cover
PCB Side Cover
Ignitor
Part Number
AU142-445
AU142-444
BU195-601
BU195-602
BU195-1877
BU195-604
BU195-605
CU195-1870
BBF9-630
BU168-707
BU195-507
EI-144
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
709
710
711
712
713
715
716
717
718
719
720
723
High Tension Cord
Transformer
120V Anti-Frost Heater B
Anti-Frost Heater Clip
Anti-Frost Heater Clip
Over Heat Switch
Thermal Fuse Harness
Thermal Fuse Clips
Thermistor
Thermistor Clip
Frost Sensing Switch
3 Amp Fuse Harness
BH38-710-200
ET-259
BU195-1879
AU195-675
AU100-721
BU129-824-2
CU195-610-2
CP-80531
BH45-650
CP-90172
BU189-530
BU195-1630
1
1
1
2
3
1
1
6
2
2
1
1
Model 2424WC 800-621-941945
INSTALLER’S INSTALLATION INSTRUCTIONS
Parts List
Number Description Part Number Quantity
801 Screw ZBA041OUK –
802 Screw ZBA051OUK –
803 Screw ZEAB0408SZ –
804 Screw ZBA0408UK –
805 Screw ZBD0408UK –
806 Screw ZAD0408UK –
807 Screw CP-21478-412 –
808 Screw ZEA0408UK –
809 Screw ZAA0408UK –
810 Screw ZBA0412UK –
811 Screw ZAG0512UK –
812 Screw ZBA0512UK –
816 Screw ZEDB0408SZ –
817 Screw CP-80452 –
819 Screw ZEAB0406UK –
820 Screw ZIAA0410SZ –
821 Screw ZAG0514UK –
822 Washer CF83-41430 –
823 Tie backs CP-90331 –
899 “O” Ring (S4) M10B-13-4 2
900 “O” Ring (P24) M10B-1-24 1
901 Packing C36F8-1 2
903 “O” Ring (P4) MlOB-2-4 1
904 “O” Ring (P7) MlOB-2-7 1
Model 2424WCwww.rinnaiamerica.com 46
INSTALLER’S INSTALLATION INSTRUCTIONS
Parts List
Number Description Part Number Quantity
905 “O” Ring (P16) M10B-2-16 1
906 “O” Ring (P12.5) M10B-2-12.5 1
907 “O” Ring (P14) M10B-2-14 1
908 “O” Ring (P18) M10B-2-18 1
Manual 3/4" gas control value BU195-1865 1
Remote control kit MCC-45-3US 1
View Window Sticker AU195-1680-2 1
Continuum Label BU195-1882X01 1
Model Number Label AU195-1881 1
Wiring Diagram CU195-1887 1
Manifold Seal AU169-206X02 1
Rating Plate (NG) CU195-1889-1X03 1
Rating Plate (LP) CU195-1889-2X03 1
Warning Label CU195-1886X01 1
Warning Repair Label AU195-1890 1
Gas Type Label (NG) CP-71201X01 1
Gas Type Label (LP) CP-71571X01 1
Gas Type Label (Bottom of Unit - NG) CP-71070 1
Gas Type Label (Bottom of Unit - LP) CP-71572 1
Model 2424WC 800-621-941947
sk about Rinnai’s other fine products:
A
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*Heat like the sun
www.rinnaiamerica.com
800-621-9419
Printed in Japan 2001.3
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