Rinnai 2424WC User Manual
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.
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