Rinnai Water Heater RC80E User Guide

Tankless Water Heater

Operation and Installation Manual

FOR INDOOR APPLICATIONS ONLY

RC80i ..................REU-KA2530FFUD-US

RC98i ..................REU-KA3237FFUD-US

FOR OUTDOOR APPLICATIONS ONLY

RC80e .................REU-KA2530WD-US

RC98e .................REU-KA3237WD-US

Table of Contents ....................2

Consumer Safety Information..4

Operating Instructions..............5

Maintenance............................11

Error Codes .............................12

Installation Instructions ............16

Consumer Support...................41

French Version ........................43

call 1-866-RINNAI1 (746-6241)

INSTALLER: Leave this manual with the appliance.

CONSUMER: Retain this manual for future reference.

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.

ANS Z21.10.3

— Installation and service must be performed by a qualified

installer, service agency or the gas supplier.

●

CSA 4.3

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Specifications

Model

RC80i

RC80e

RC98i

RC98e

Minimum Gas Consumption Btu/h

Maximum Gas Consumption Btu/h

Hot water capacity (Min - Max) *

9,500 (NG)

10,300 (LPG)

157,000

199,000

0.4 - 8.0 GPM (1.5 - 30 L/min)

6.6 GPM (25 L/min)

0.4 - 9.8 GPM (1.5 - 37 L/min)

8.5 GPM (32 L/min)

Hot water capacity (45°F rise)

Default Temperature Setting (no controller)

Temperature Controller Default Setting

Maximum Temp Setting (commercial **)

120º F (49º C)

104º F (40º C)

185º F (85º C)

Maximum Temp Setting (residential)

Selectable at 120º F (49º C) or at 140º F (60º C)

see Temperature Ranges for more information

Minimum Temperature Setting

Weight

98º F (37º C)

63.9 lb (29 kg)

0.96

70.5 lb (32 kg)

Energy Factor

0.94

80 W

220 W

0.93

59 W

172 W

Noise level

50 dB

2 W

Normal

63 W

44 W

Electrical

Consumption

Standby

Anti-frost Protection

By-Pass Control

220 W

172 W

Electronic

Natural Gas

Propane

5.0 inch W.C.

8.0 inch W.C.

10.5 inch W.C.

13.5 inch W.C.

Minimum Gas Supply

Pressure

Natural Gas

Propane

Maximum Gas Supply

Pressure

Type of Appliance

Operation

Condensing, Tankless, Temperature controlled continuous flow gas hot water system.

With or without temperature controllers, mounted in kitchen, bathroom, etc.

Natural Gas or Propane - Ensure unit matches gas type supplied at the installation location.

Gas Supply: 3/4" MNPT, Cold Water Inlet: 3/4" MNPT, Hot Water Outlet: 3/4" MNPT

Direct Electronic Ignition

Approved Gas Type

Connections

Ignition System

Electric Connections

Appliance: AC 120 Volts, 60Hz. Temperature Controller: DC 12 Volts (Digital)

Simulation Feedforward and Feedback.

Water Temperature Control

Water Supply Pressure

Minimum Water Pressure: 50 PSI (Recommended 60-80 PSI for maximum performance)

150 PSI

Maximum Water Supply Pressure

Remote Control Cable

Non-Polarized Two Core Cable (Minimum 22 AWG)

Energy Star Qualified

Yes

* Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature.

** for commercial and hydronic applications requiring higher temperatures

Rinnai is continually updating and improving products. Therefore, specifications are subject to change without

prior notice.

The maximum inlet gas pressure must not exceed the value specified by the manufacturer. The minimum value

listed is for the purpose of input adjustment.

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Consumer Safety Information

Safety Definitions

This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and

others.

Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury.

DANGER

Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury.

WARNING

CAUTION

Indicates a potentially hazardous situation which, if not avoided, could result in minor or

moderate injury. It may also be used to alert against unsafe practices.

Safety Behavior and Practices

WARNING

• Keep the area around the appliance clear and free

from combustible materials, gasoline, and other

flammable vapors and liquids.

• This appliance is equipped with a three-prong plug

for your protection against shock hazard and should

be plugged directly into a properly grounded three-

prong receptacle. Do not cut or remove the ground

prong from this plug.

• 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.

• Any alteration to the appliance or its controls can be

dangerous and will void the warranty.

• Always check the water temperature before entering

a shower or bath.

Safety Features

• Overheat: The appliance will automatically shut

down when the appliance exceeds a predetermined

temperature.

• Power Surge Fuse: A glass fuse protects against

overcurrent. If the fuse blows then all indicator

lamps will be off.

• Flame Failure: The appliance will automatically

• Fusible Link: In case the overheat feature does

not prevent the temperature from rising then the

fusible link will break shutting off the appliance.

shut down if the burner flame is extinguished.

• Power Failure: The appliance will cut off the gas if

it loses electrical power.

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Description of Operation

The Rinnai water heater is one of the most advanced

water heaters available. It provides a continuous

supply of hot water at a preset temperature.

Ignition is electronic. There is no pilot light consuming

gas while the water heater is not being used. The gas

burner lights automatically when the hot water tap is

opened and goes out when the tap is closed.

This appliance is a condensing tankless, direct vent

appliance where air is brought in from the outside and

combustion gases are exhausted to the outside. This

appliance uses a concentric vent where the outer

passage way brings in air from the outside, and the

inner passage way expels the combustion gases.

Installation of the temperature controller is highly

recommended. The temperature controller can set the

temperature within a specific range and can provide

error codes to diagnose any problems.

The temperature of the outgoing hot water is constantly

monitored. The Rinnai water heater may adjust the

water flow in order to maintain the temperature setting.

The water flow may vary from summer to winter due to

the difference in ground water temperature.

While electricity, water, and gas supplies are

connected, the Rinnai water heater produces hot water

whenever a hot water tap is open.

Operating Instructions

Features Available on Temperature Controllers

The MC-91 temperature controller is supplied with the appliance. Additional functions are available through the

use of optional controllers.

Description

Features

Call

Sends a short series of beeps to all controllers in the system. It is

not an intercom.

Clock

12 hour AM/PM clock.

Error Codes

When a fault is detected an error code flashes at the temperature

display on models MC-91, MCC-91, and MC-502; and flashes at

the clock display on models MC-100 and BC-100.

Function

Used on this model to set the clock or sound volume.

In Use Indicator

Indicates that hot water is being supplied (i.e. a hot water tap is

open).

ON/OFF Button

Power Save

Used to turn the water heater ON or OFF.

Allows the temperature controller to be in an energy saving

mode.

Priority Button /

Indicator

Indicates that this controller is setting the temperature . Priority

can be switched to another controller by pressing its Priority

Button when no hot water is running.

Sound Volume

Temperature Display

Thermostat

Used to adjust the voice prompt volume.

Shows the temperature setting.

Increases or decreases the temperature setting.

Water Smart / Bath Fill

Button / Indicator

Used to select the Water Smart / Bath Fill Function to fill a bath

with a predetermined volume of water.

Water Volume

Used to select the water volume for the Water Smart / Bath Fill

Function.

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Temperature Controllers - Models

MC-91-1US & MCC-91-1US

Dimensions (inches): 3.5 W x 4.75 H x 0.75 D

The MC-91 controller is the standard temperature controller that is supplied with the water heater. On indoor

models it is integrated into the front panel. The MCC-91 controller is for commercial and hydronic applications

requiring higher temperatures. When the MCC-91 controller is connected, these higher temperatures are

available on all controller models in the system. Refer to the section on temperature ranges.

In Use

Indicator

Priority

Indicator

Temperature

Display

Priority

Button

Temperature

Selection

ON/OFF

Button

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How to Set the Temperature

Hot water can be dangerous, especially for infants or children, the elderly,

or infirm. There is hot water scald potential if the thermostat is set too high.

DANGER

Water temperatures over 125º F (52º C) can cause severe burns or

scalding resulting in death.

Hot water can cause first degree burns with exposure for as little as:

3 seconds at 140º F (60º C)

20 seconds at 130º F (54º C)

8 minutes at 120º F (49º C)

Test the temperature of the water before placing a child in the bath or

shower.

Do not leave a child or an infirm person in the bath unsupervised.

1. If the water heater is off, press

the ON/OFF button to turn on.

While any hot water is being

NOTICE

provided, the temperature setting can

only be adjusted between 98º F

(37º C) and 110º F (43º C).

2. Press the “Priority button” on the

temperature controller. The

green Priority light will glow

indicating that this controller is

controlling the temperature and

that the Rinnai water heater is

ready to supply hot water.

Check local codes for the maximum

water temperature setting allowed

when used in nursing homes,

schools, day care centers, and all

other public applications.

If a newly installed unit with a

The priority can only be changed

while no hot water is running.

NOTICE

controller has not been powered for

at least 6 hours then the temperature

will return to the default setting of

104º F (40º C) if power is interrupted.

3. Press the ▲ or ▼ buttons to

obtain the desired temperature

setting.

There may be a variation between

the temperature displayed on the

temperature controller and the

temperature at the tap due to

weather conditions or the length of

pipe to the water heater.

All hot water sources are able to

provide water at this temperature

setting until it is changed again at

this or another temperature

controller.

Temperature Controller Settings

This water heater will attempt to provide hot water at the temperature setting even when the water flow is varied

or when more than 1 tap is in use. The water heater can deliver water at only one temperature setting at a time.

The available temperatures for a given model are provided below.

Model

Temperature Settings Available (ºF)

RC80i

RC80e

RC98i

RC98e

125 130 135 140 150 160 185

98 100 102 104 106 108 110 115 120

Temp in Celsius ºC 37 38 39 40 41 42 43 46 49 52 54 57 60 66 71 85

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Temperature Controller Settings

Maximum Temperature

* Re-setting the Maximum Temperature

These models have a default maximum temperature of 120º F (49º C)

and an option to increase the maximum temperature to 140 ºF (60 ºC).

Temperature settings from 125-140 ºF (52-60 ºC) are available by

setting switch 6 to ON in the SW1 bank of 8 switches.

120º F (49º C)

140 ºF (60 ºC)

Switch No.

** MCC-91 Temperature Controller

These settings require the MCC-91 controller. When the MCC-91

controller is connected, these higher temperatures are available on all

controller models in the system. Use of an MCC-91 controller in a

residential dwelling will reduce the warranty coverage to that of a

commercial warranty application.

The MCC-91 controller is intended for commercial and hydronic

applications only. If an MCC-91 controller is used in a residential

dwelling for a hydronics application, a mixing valve must also be

installed to limit the potable hot water temperature to a safe

temperature. Water temperatures over 125º F (52º C) can cause severe

burns or scalding. Refer to the Danger Alert on water temperatures.

Rinnai shall not, in any event, be liable for damages resulting from such

misuse or misapplication.

WARNING

DO NOT adjust the other switches

unless specifically instructed to do

so.

A temperature lower than 98º F (37º C) can be

obtained at the tap by mixing with cold water.

Suggested temperatures are

•

Kitchen 120 ºF (49º C)

Shower 98 - 110 ºF (37 - 43 ºC)

Bath Fill 102 - 110 ºF (39 - 43 ºC)

To change the temperature scale from Celsius to

Fahrenheit or vice versa, press and hold the “On/Off”

button for 5 seconds while the water heater is OFF.

These temperatures are suggestions only.

Temperature Options Without a Temperature Controller

The default temperature setting for this appliance installed without a temperature controller is 120º F (49º C). If

desired, the temperature setting can be changed to 140º F (60º C) by adjustment of a switch.

In the SW1 bank of 8 switches, set switch 5 to ON to obtain 140º F (60º C) water temperature setting. Set switch

5 to OFF (default) to obtain 120º F (49º C) water temperature setting.

If a temperature controller is installed, then switch 5 has no effect on temperature settings.

Setting the Sound Volume (Voice Prompt)

MC-100V Press the “Function” button to

adjust the voice prompt

BC-100V Press the “Sound Vol.” button to

adjust the voice prompt volume.

The default sound volume is set

to Medium. Each subsequent

press of the button cycles

volume. The default sound

volume is set to Medium.

Each subsequent press of the

▲ or ▼ button cycles through

the volume levels in the order

below.

through the volume levels in the

order below.

Medium Volume

(default)

Off Volume

(beep)

Off Sound

Low Volume

(no beep)

High Volume

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Using the Water Smart / Bath Fill Function

The bath fill function will not work

properly if it is connected to multiple

water heaters. The tub will overfill

because the bath fill function is not

able to measure the water volume

when connected to multiple water

heaters.

NOTICE

Overview

This function is exclusive to the BC-100V temperature

controller. The bath fill function allows the consumer

to fill a tub with a preset volume of water at a preset

temperature. This is done by pressing the bath fill

button on the BC-100V controller while no hot water is

flowing and then opening only the hot water tap. The

water heater will stop the hot water flow when the

preset volume has been reached. The hot water tap

should then be closed and the bath fill button pressed.

Multiple

Water

Heaters

If power is lost during the bath fill

function, the water heater will shut

down but the water will continue to

flow. When power returns, the water

shuts off and Error Code 03 appears

on the controller.

NOTICE

The temperature settings for the bath fill function are

limited to those in the table below.

Power

Loss

If power is lost after the bath has filled

but before the bath fill function button

is de-selected, then the water will not

flow during the power loss or after the

power is returned. Once power

returns, close the hot water tap and

de-select the bath fill function. No

error code appears.

Bath Fill Temperature Settings Available

ºF 98 100 102 104 106 108

ºC 37 38 39 40 41 42

ºF 110 112 114 116 118 120

ºC 43 44 46 47 48 49

Do not use with single handle fixtures

that have anti-scald features built into

them. These fixtures allow a

NOTICE

Anti-scald

Fixtures

predetermined amount of cold water

which is not taken into account by the

bath fill function.

Setting the Water Volume

The default volume is set to 25 gallons. The volume

can be set between 10 and 120 gallons.

1.Press the “Priority” button on the

temperature controller. The green

Priority light will glow indicating

that this controller is controlling

the temperature and that the

Rinnai water heater is ready to

supply hot water.

4.Press the “Water Vol.”▲ or ▼

buttons to obtain the desired

water volume in gallons.

5.Press the “Water Smart Bath Fill”

button.

2.Press the “Water Smart Bath Fill”

button to set the water volume

and temperature.

Be careful not to overfill the bath. An

average bath volume is 60 gallons.

When filling the bath using this

function for the first time:

NOTICE

3.Press the “Temp” ▲ or ▼ buttons

to obtain the desired temperature

setting.

To Prevent

Over Filling

•

Monitor and remain by the bath

while the water is running.

•

Use a low bath fill volume less

than 25 gallons

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Using the Water Smart / Bath Fill Function

Filling the Tub

1. Press the “Water Smart / Bath Fill”

To stop the water flow during the Bath

Fill function, press the “Water Smart /

Bath Fill” button. The button will flash

and the voice prompt will announce,

“Hot water is not available. Turn off

all hot water taps and push the Bath

Fill button.” Follow the voice prompt

instructions.

NOTICE

button once. The button will

illuminate, and a tone will sound.

To Stop the

Bath Fill

Before it

Finishes

2. The voice prompt will announce

“The hot water system is ready.

Open the hot water tap.”

ON!

HOT

COLD

Make sure the water volume is set.

Refer to “Setting the Water

Volume” on the previous page.

Open the hot water tap. The “In

Use” indicator will illuminate on

MC-100V and BC-100V controllers.

The hot water will begin to flow.

During the bath fill function, any hot

water flowing at other locations,

subtracts from the total amount of

water for the bath. For example if the

bath fill function is set for 50 gallons

and 5 gallons of hot water are used at

other locations during the fill period

then the bath will only fill with 45

gallons.

ON!

HOT

COLD

3. When the preset volume of water

has been produced then

NOTICE

•

the water flow will cease

When

Other Taps

Are Open

the “Water Smart / Bath Fill”

button will flash

•

a tone will sound

the voice prompt will

announce, “Bath fill is

complete. Turn off the bath

hot water tap and push the

Bath Fill button.”

During the operation of the bath fill

function, the MC-91 “In Use” button

does not light up.

NOTICE

4. Turn off the bath hot water tap and

push the Bath Fill button. The

water heater will not allow hot

water to flow from any source until

the “Water Smart / Bath Fill” button

is pushed.

The button light will go out.

Setting Controller to Mute

Models MC-91 and MCC-91

To eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both the ▲and ▼

buttons until a beep is heard (approximately 5 seconds).

Setting the Clock

MC-100V Press the “Function” button twice within 10 seconds to set the clock. Press the ▲ or

▼ button to reach the desired time. The clock on the BC-100V automatically shows

the time which has been set on the MC-100V.

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Maintenance

Snow Accumulation

WARNING

Keep the area around flue terminal free of snow and

ice. The appliance will not function properly if the

intake air or exhaust is impeded (blocked or partially

blocked) by obstructions.

Turn off the electrical power supply, the manual gas

valve and the manual water control valve whenever

servicing the unit.

Repairs and maintenance should be performed by a

qualified service technician. The appliance should be

inspected annually by a qualified service technician.

Verify proper operation after servicing.

Visual Inspection of Flame

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 the view ports.

Cleaning

It is imperative that control compartments, burners,

and circulating air passageways of the appliance be

kept clean.

The flame pattern should be as shown in the figures

below.

Clean as follows:

1. Turn off and disconnect electrical power. Allow to

cool.

2. Close the water shut off valves. Remove and clean

the water inlet filter.

3. Remove the front panel by removing 4 screws.

4. Use pressurized air to remove dust from the main

burner, heat exchanger, and fan blades. Do not

use a wet cloth or spray cleaners on the burner.

Do not use volatile substances such as benzene

and thinners. They may ignite or fade the paint.

5. Use soft dry cloth to wipe cabinet.

Vent System (for indoor models)

The vent system should be inspected at least annually

for blockages or damage.

Air Intake (for outdoor models)

The air intake and exhaust should be inspected at

least annually for blockages or damage.

Motors

Motors are permanently lubricated and do not need

periodic lubrication. Keep fan and motor free of dust

and dirt by cleaning annually.

Temperature Controller

Use a soft damp cloth to clean the temperature

controller. Do not use solvents.

Lime / Scale Build-up

If you receive Error Code “LC”, refer to the procedure,

Flushing the Heat Exchanger. Refer to the section on

Water Quality to see if your water needs to be treated

or conditioned. (When checking maintenance code

history, “00” is substituted for “LC”.)

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Error Codes

The Rinnai water heater has the ability to check its own operation continuously. If a fault occurs, an error code

will flash on the Display of the temperature controller. This assists with diagnosing the fault and may enable you

to overcome a problem without a service call. Please identify the code displayed when inquiring about service.

Some of the checks below may need to be done by a qualified service technician. Call a

WARNING

service technician for any remedy that involves gas or electricity. Call a service

technician if you have any doubt or reservation about performing the remedy yourself.

Code

Fault

Remedy

Turn off all hot water taps. Press ON/OFF twice.

Power interruption during

Bath Fill (Water will not flow

when power returns).

Ensure Rinnai approved venting materials are being used.

Check that nothing is blocking the flue inlet or exhaust.

Check all vent components for proper connections.

Ensure vent length is within limits.

Air Supply or Exhaust

Blockage

Verify dip switches are set properly.

Check fan for blockage.

Burner Sensor Error (see code 31)

Check the fins in the heat exchanger.

Check that the gas is turned on at the water heater, gas meter, or cylinder.

Ensure gas type and pressure is correct.

No Ignition

Ensure gas line, meter, and/or regulator is sized properly.

Bleed all air from gas lines.

Verify dip switches are set properly.

Ensure appliance is properly grounded.

Disconnect EZConnect™ or MSA controls to isolate the problem.

Ensure igniter is operational.

Check igniter wiring harness for damage.

Check gas solenoid valves for open or short circuits.

Remove burner cover and ensure all burners are properly seated.

Remove burner plate and inspect burner surface for condensation or debris.

Check that the gas is turned on at the water heater and gas meter. Check for obstructions in

the flue outlet.

Flame Failure

Ensure gas line, meter, and/or regulator is sized properly.

Ensure gas type and pressure is correct.

Bleed all air from gas lines.

Ensure proper Rinnai venting material was installed.

Ensure vent length is within limits.

Verify dip switches are set properly.

Ensure appliance is properly grounded.

Disconnect keypad.

Disconnect EZConnect™ or MSA controls to isolate the problem.

Check power supply for loose connections.

Check power supply for proper voltage and voltage drops.

Ensure flame rod wire is connected.

Check flame rod for carbon build-up.

Disconnect and reconnect all wiring harnesses on unit and PC board.

Check for DC shorts at components.

Check gas solenoid valves for open or short circuits.

Remove burner plate and inspect burner surface for condensation or debris.

Check the ground wire for the PC board.

Check gas type of unit and ensure it matches gas type being used.

Check for restrictions in air flow around unit and vent terminal.

Check for low water flow in a circulating system causing short-cycling.

Ensure dip switches are set to the proper position.

Thermal Fuse

Check for foreign materials in combustion chamber and/or exhaust piping.

Check heat exchanger for cracks and/or separations.

Check heat exchanger surface for hot spots which indicate blockage due to scale build-up.

Refer to instructions in manual for flushing heat exchanger.

Measure resistance of safety circuit.

Ensure high fire and low fire manifold pressure is correct.

Check for improper conversion of product.

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Code

Fault

Remedy

Check for restrictions in air flow around unit and vent terminal.

Check for low water flow in a circulating system causing short-cycling.

Check for foreign materials in combustion chamber and/or exhaust piping.

Check for clogged heat exchanger.

Over Temperature

Warning

Condensate container is full.

Check condensate drain for blockage.

Replace condensate trap.

Condensate Trap Error

Burner Sensor Error

Measure resistance of sensor.

Replace sensor.

Check sensor wiring for damage.

Measure resistance of sensor.

Clean sensor of scale build-up.

Replace sensor.

Outgoing Water

Temperature Sensor

Fault

Check sensor wiring for damage.

Measure resistance of sensor.

Clean sensor of scale build-up.

Replace sensor.

Heat Exchanger

Outgoing Temperature

Sensor Fault

Check modulating gas solenoid valve wiring harness for loose or damaged terminals.

Measure resistance of valve coil.

Modulating Solenoid

Valve Signal Abnormal

Combustion Fan

Failure

Ensure fan will turn freely.

Check wiring harness to motor for damaged and/or loose connections.

Measure resistance of motor winding.

The water flow control valve has failed to close during the bath fill function. Immediately turn off

the water and discontinue the bath fill function. Contact a state qualified or licensed contractor to

service the appliance.

Water Flow Control

Fault

Check PC board switches (in the bank of 6 switches, #2 should be on for indoor models and off for

outdoor models)

Check the connection harness at the E connection on the PC board. Outdoor models should have

2 orange cables at #7 and 8 positions. Indoor models should not have cables at these positions. If

this is incorrect then replace the sensor harness.

Sensor Harness

Connection

Replace PC board

Replace PC board.

SV0, SV1, SV2, SV3

and SV4 Solenoid

Valve Circuit Fault

Flame Sensing Device

Fault

Ensure flame rod is touching flame when unit fires.

Check all wiring to flame rod for damage.

Remove flame rod and check for carbon build-up; clean with sand paper.

Check inside burner chamber for any foreign material blocking flame at flame rod.

Measure micro amp output of sensor circuit with flame present.

Replace flame rod.

Check sensor wiring and PC board for damage.

Replace sensor.

Burner Sensor Circuit

Error

Flush heat exchanger. Refer to instructions in manual.

Replace heat exchanger.

NOTE: The LC code is the only error code that will allow the unit to keep running. The display will

alternate between the LC code and the temperature setting. The controller will continue to beep.

The LC code will reset if power is turned off and then on.

Scale Build-up in Heat

Exchanger (when

checking maintenance

code history, “00” is

substituted for “LC”)

Nothing happens when

water flow is activated.

Clean inlet water supply filter.

code

On new installations ensure hot and cold water lines are not reversed.

Check for bleed over. Isolate unit from building by turning off cold water line to building. Isolate the

circulating system if present. Open your pressure relief valve; if water is flowing, there is bleed

over in your plumbing.

Ensure you have at least the minimum flow rate required to fire unit.

Ensure turbine spins freely.

Measure the resistance of the water flow control sensor.

Check for DC shorts at components.

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Trouble Shooting for Common Issues

I don’t have any hot water when I open the tap.

White smoke comes out of the exhaust.

Make sure there is gas, water, and electricity to the

Rinnai water heater (power is turned on and the gas is

turned on).

During colder weather when the exhaust temperature

is much hotter than the outside air, the exhaust fumes

condense producing water vapor.

When I open a hot tap, I do not immediately get hot

water.

When I was using the hot water, the water got cold.

If you adjusted the flow from the tap to lessen it, you

may have gone below the minimum flow required. The

Rinnai water heater requires a minimum flow rate to

operate. (See the specification page for the flow rate

of your model.)

Hot water must travel through your plumbing from the

Rinnai water heater to the faucet. The time period for

hot water to reach your fixture is determined by the

amount of water in the plumbing system between the

water heater and the fixture, water pressure, and the

flow rate of the fixture.

If you are experiencing issues with higher temperature

settings, then Rinnai recommends reducing the

temperature setting. Selecting a temperature closer to

that which is actually used at the faucet will increase

the amount of hot water being delivered to the faucet,

due to less cold water mixing at the fixture.

After I turn off the hot water tap, the fan on the

Rinnai water heater continues to run.

The fan is designed to continue running for a short time

after the flow of water 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.

Accessing Operating Information

Models MC-91 and MCC-91

To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/

Off” button press the ▲ button. The last 9 error codes will flash one after the other. To exit this mode press the

“On/Off” and ▲ button as before.

To display the water flow through the water heater press and hold the ▲ button for 2 seconds and without

releasing the ▲ button press the “On/Off” button.

To display the outlet water temperature press and hold the ▼ button for 2 seconds and without releasing the ▼

button press the “On/Off” button.

Water Quality

Consideration of care for your water heater should

include evaluation of water quality. If the water quality

exceeds the target levels provided in the table, you

may want to treat or condition the water.

Maximum Level

Up to 200 mg / L

Up to 0.2 mg / L

Up to 250 mg / L

Up to 1.0 mg / L

Up to 0.3 mg / L

Up to 0.05 mg / L

6.5 to 8.5

Total Hardness

Aluminum *

Chlorides *

Copper *

•

Source: Part 143 National Secondary Drinking

Water Regulations

Component failure resulting from water quality issues

is not covered under the Rinnai product warranty.

Iron *

Manganese *

pH *

TDS (Total Dissolved

Solids) *

Up to 500 mg / L

Zinc *

Up to 5 mg / L

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Flushing the Heat Exchanger (Error Code: LC or 00)

An “LC” or “00” error code indicates the unit is beginning to lime up and must be flushed. Failure to flush the

appliance will cause damage to the heat exchanger. Damage caused by lime build-up is not covered by the unit’s

warranty. After flushing, reset the LC fault code by turning off the power to the unit and turning the power back

on.

KEY

1. Disconnect electrical power to the water heater.

2. Close the shutoff valves on both the hot water and

cold water lines (V3 and V4).

Pressure Regulator

Circulating Pump

3/4" Ball Valve

3/4" Union

3. Connect pump outlet hose (H1) to the cold water

line at service valve V2.

Check Valve

Boiler Drain Valve

Solenoid Valve

4. Connect drain hose (H3) to service valve V1.

Pressure Relief Valve

5. Pour 4 gallons of undiluted virgin, food grade,

white vinegar into pail.

6. Place the drain hose (H3) and the hose (H2) to

the pump inlet into the cleaning solution.

7. Open both service valves (V1 and V2) on the hot

water and cold water lines.

8. Operate the pump and allow the cleaning solution

to circulate through the water heater for 1 hour at

a rate of 4 gallons per minute (15.1 liters per

minute).

Rinnai

Water Heater

9. Turn off the pump.

10. Rinse the cleaning solution from the water heater

as follows:

a. Remove the free end of the drain hose (H3)

from the pail.

b. Close service valve, (V2), and open shutoff

valve, (V4). Do not open shutoff valve, (V3).

c. Allow water to flow through the water heater for

5 minutes

d. Close service valve, (V1), and open shutoff

valve, (V3).

In-line

Filter

11. Disconnect all hoses.

12. With (V4) closed, remove the in-line filter at the

cold water inlet and clean out any residue. Place

filter back into unit and open (V4).

13. Restore electrical power to the water heater.

Clean Thermistors

Remove and clean thermistors

with a soft cloth or sponge after

removing O-rings.

Gas

Supply

Hot

Water

Line

Cold

Water

Line

Cleaning solution is 4 gallons of

undiluted virgin, food grade,

white vinegar.

Circulating Pump

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Installation Instructions

Only properly trained and qualified installers

FOR INDOOR APPLICATIONS ONLY

should install this appliance. The warranty may

be voided due to improper installation or

installation by a non-qualified installer.

RC80i..................REU-KA2530FFUD-US

RC98i..................REU-KA3237FFUD-US

Rinnai highly recommends all installers attend a

product knowledge class.

FOR OUTDOOR APPLICATIONS ONLY

For information on a Rinnai Training Course or

for questions on installation call 1-800-621-

9419.

RC80e.................REU-KA2530WD-US

RC98e.................REU-KA3237WD-US

General Instructions

• The appliance must be isolated from the gas supply

piping system by closing its individual manual

shutoff valve during any pressure testing of the gas

supply piping system at test pressures equal to or

less than 1/2 psi (3.5 kPa) (13.84 in W.C.).

WARNING

Do not use substitute materials.

Use only parts certified with the appliance.

• Follow the installation instructions and those in Care

• This appliance must be installed by a state qualified

or licensed contractor. It is the responsibility of the

person having the water heater installed to ensure

the installing contractor has proper licenses and

permits for installing water heaters in your location.

Rinnai highly recommends that installers attend a

product knowledge class to ensure customer

satisfaction and warranty coverage. Failure to

comply with state and local codes pertaining to

water heater installations may void the warranty.

and Maintenance for adequate combustion and

ventilation air.

• The appliance should be located in an area where

water leakage of the unit or connections will not

result in damage to the area adjacent to the

appliance or to lower floors of the structure. When

such locations cannot be avoided, it is

recommended that a suitable drain pan, adequately

drained, be installed under the appliance. The pan

must not restrict combustion air flow.

• The RC80i (REU-KA2530FFUD-US) and RC98i

(REU-KA3237FFUD-US) are not to be installed

outdoors.

• The flow of combustion and ventilation air shall not

be obstructed.

• This appliance is not suitable for use in an

application such as a pool or spa heater that uses

chemically treated water . (This appliance is

suitable for filling large or whirlpool bath tubs with

potable water.)

• The RC80e (REU-KA2530WD-US) and RC98e

(REU-KA3237WD-US) are not to be installed

indoors.

• A qualified installer or service technician should

install the appliance, inspect it, and leak test it

before use.

• If a water heater is installed in a closed water supply

system, such as one having a backflow preventer in

the cold water supply line, means shall be provided

to control thermal expansion. Contact the water

supplier or local plumbing inspector on how to

control thermal expansion.

• The installation must conform with local codes or, in

the absence of local codes, with the National Fuel

Gas Code, ANSI Z223.1/NFPA 54, or the Natural

Gas and Propane Installation Code, CSA B149.1.

• The appliance, when installed, must be electrically

grounded in accordance with local codes or, in the

absence of local codes, with the National Electrical

Code, ANSI/NFPA 70, or the Canadian Electrical

Code, CSA C22.1.

• Should overheating occur or the gas supply fail to

shut off, turn off the manual gas control valve to the

appliance.

• Keep the air intake location free of chemicals such

as chlorine or bleach that produce fumes. These

fumes can damage components and reduce the life

of your appliance.

• The appliance and its appliance main gas valve

must be disconnected from the gas supply piping

system during any pressure testing of that system at

test pressures in excess of 1/2 psi (3.5 kPa) (13.84

in W.C.).

• Component damage resulting from chemical fumes

is not covered under the Rinnai product warranty.

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Clearances from Appliance

RC80i, RC98i

RC80e, RC98e

to top

Top of

Heater

6 inches * 2 inches *

Top of

Heater

12 inches

(305 mm)

2 inches

(51 mm)

to side

(152 mm)

(51 mm)

Back of

Heater

0 (zero)

Back of

Heater

0 (zero)

Front of

Heater

6 inches

(152 mm)

6 inches

(152 mm)

Front

(Panel)

24 inches

(610 mm)

to front

to floor/ground

Sides of

Heater

2 inches

(51 mm)

1/2 inch

(13 mm)

Front

(Exhaust)

24 inches

(610 mm)

24 inches

(610 mm)

Ground

12 inches

(305 mm)

12 inches

(305 mm)

Sides of

Heater

6 inches

(152 mm)

1/8 inch

(3.2 mm)

Ground

12 inches

(305 mm)

2 inches

(51 mm)

Vent

0 (zero)

* Zero inches from vent components and condensate drain line.

The clearance for servicing is 24 inches in front of the water heater.

For closet installation: clearance is 6 inches (152 mm) from the front.

Attachment of the Water Heater

1. Identify the installation location and confirm that

the installation will meet all required clearances.

2. Securely attach the water heater to the wall using

any of the holes in the wall installation brackets

which are at the top and bottom of the water

heater. Ensure that the attachment strength is

sufficient to support the weight. Refer to the

weight of the water heater in the Specifications

section.

wall installation

brackets

NOTE: Rinnai water heaters should be installed in an

upright position. Do not install upside down

or on its side.

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Electrical Connection

The water heater requires 120 VAC, 60 Hz power from a properly grounded circuit.

If using the 6 foot long power cord, plug it into a standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet.

The wiring diagram is located on the Technical Sheet attached to the inside of the front cover.

The water heater must be electrically grounded in accordance with local codes, or in the absence of local codes

with the National Electrical Code, ANSI/NFPA 70 and/or the CSA C22.1, Canadian Electrical Code.

Error Indication or Air Handler Control Switch

When using the Rinnai water heater with an Error Indication Switch, switch No. 4 in the bank of 8 switches should

be in the off position. This is the default position.

To connect the water heater to the Rinnai Air Handler, the Control Switch is necessary to function as the electrical

connection. When the Control Switch is functioning as the electrical connection between the water heater and air

handler, switch No. 4 in the bank of 8 switches should be in the on position.

The Error Indication Switch and the Rinnai Air Handler Control Switch are optional products available from Rinnai.

Installation instructions are included with these products.

Gas Piping

General Instructions

including soap and water, may cause corrosion or

stress cracking, the piping shall be rinsed with water

after testing, unless it has been determined that the

leak test solution is non-corrosive.)

• A manual gas control valve must be placed in the

gas supply line to the Rinnai water heater. A union

can be used on the connection above the shut off

valve for the future servicing or disconnection of the

unit.

• 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.

• Check the type of gas and the gas inlet pressure

before connecting the Rinnai water heater. If the

Rinnai water heater 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.

• The gas supply line shall be gas tight, sized, and so

installed as to provide a supply of gas sufficient to

meet the maximum demand of the heater and all

other gas consuming appliances at the location

without loss of pressure.

• Check the gas supply pressure immediately

upstream at a location provided by the gas

company. Supplied gas pressure must be within the

limits shown in the Specifications section.

• Any compound used on the threaded joint of the gas

piping shall be a type which resists the action of

liquefied petroleum gas (propane / LPG).

• Before placing the appliance in operation 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. (Since some leak test solutions,

• Refer to an approved pipe sizing chart if in doubt

about the size of the gas line.

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Gas Piping

Pipe Sizing Procedure - Example

The gas supply must be capable of handling the entire gas load at the location. Gas line sizing is based on gas

type, the pressure drop in the system, the gas pressure supplied, and gas line type. For gas pipe sizing in the

United States, refer to the National Fuel Gas Code, NFPA 54. For Canadian gas pipe sizing, refer to the Natural

Gas and Propane Installation Code CAN/CSA B149.1. The below information is provided as an example. The

appropriate table from the applicable code must be used.

1.For some tables, you will need to determine the cubic feet per hour of gas required by dividing the gas input by

the heating value of the gas (available from the local gas company). The gas input needs to include all gas

products at the location and the maximum BTU usage at full load when all gas products are in use.

Gas Input of all gas products (BTU / HR)

Cubic Feet per Hour (CFH) =

Heating Value of Gas (BTU / FT ³)

2.Use the table for your gas type and pipe type to find the pipe size required. The pipe size must be able to

provide the required cubic feet per hour of gas or the required BTU/hour.

Example: The heating value of natural gas for your location is 1000 BTU/FT³. The gas input of the RC98i is

199,000 BTU/HR. Additional appliances at the location require 65,000 BTU/hr. Therefore the cubic

feet per hour = (199,000 + 65,000) / 1000 = 264 FT³/HR. If the pipe length is 10 feet then the 3/4 inch

pipe size is capable of supplying 264 FT³/HR of natural gas.

Pipe Sizing Table - Natural Gas

Pipe Sizing Table - Propane Gas

Schedule 40 Metallic Pipe

Inlet Pressure: less than 2 psi (55 inches W.C.)

Pressure Drop: 0.3 inches W.C.

Specific Gravity: 0.60

Inlet Pressure: 11.0 inches W.C.

Pressure Drop: 0.5 inches W.C.

Specific Gravity: 1.50

Capacity in cubic feet per hour

Capacity in Thousands of BTU per Hour

Pipe Size (inches)

Length

Pipe Size (inches)

Length

3/4

273

188

151

129

114

104

1 1/4

1060

726

583

499

442

400

368

343

322

304

269

244

224

209

1 1/2

1580

1090

873

747

662

600

552

514

482

455

403

366

336

313

1/2

291

200

160

137

122

110

101

3/4

608

418

336

287

255

231

212

197

185

175

155

140

1 1/4

2350

1620

1300

1110

985

514

353

284

243

215

195

179

167

157

148

131

119

109

102

1150

787

632

541

480

434

400

372

349

330

292

265

892

821

100

125

150

175

200

763

716

100

125

150

175

200

677

600

543

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Water Piping

Isolation Valves and Pressure Relief Valve

The isolation valves provide the ability to isolate the

water heater from the structure’s plumbing and allow

quick access to flush the heat exchanger. Check with

local codes to determine if a pressure and temperature

relief valve is required. The included valves meet

American National Standard (ANSI Z21.10.3) /

Canadian Standard (CSA 4.3) and are ANSI/NSF 65

approved for potable water.

Isolation Valve (Cold)

Isolation Valve (Hot)

107000082

107000084

107000085

Pressure Relief Valve (PRV)

Isolation Valves Installation Instructions:

1. Wrap the ends of the threaded water inlet & outlet

on the tankless water heater,as well as the

Pressure Relief Valve (PRV)

PRV Discharge Outlet

threaded end of the approved pressure relief valve

with a minimum of 5 wraps of Teflon® tape.

Hot Ball Valve Drain Handle

Cold Ball Valve Drain Handle

2. Screw the pressure relief valve into the 3/4”

threads opposite the wing handle on the HOT

water service valve. (RED drain handle) (see

Pressure Relief Valve Section for proper

installation requirements)

Pressure Relief Valve Installation Instructions:

The PRV must be connected by the threaded

3. Loosen the 3/4” union nut on the HOT water valve

and connect to the HOT water outlet on the

tankless water heater. If nut is removed, ensure

that you realign the tailpiece accurately to the

valve and that the black washer is positioned such

that the raised metal edge of the valve is inside

the washer.

connection opposite the wing handle on the hot water

valve (designated by the RED drain handle) or the

threaded connection on the side of the relocation

fitting above the hot water valve. Installation must

maintain a ¾” port size with no shut off valve or line

restriction in-between the appliance and the PRV. The

discharge line from the PRV should pitch downward

and terminate 6” above drains where discharge will be

clearly visible. The discharge end of the line shall be

plain (unthreaded) and a minimum of ¾” in diameter.

The discharge line material must be suitable for water

at least 180º Fahrenheit and can be no more than 30

feet in length and contain no more than 4 elbows or

bends. No valve of any type may be installed in the

discharge line of the pressure relief valve.

4. Align the direction of the HOT water drain to the

desired position.

5. Tighten the union assembly to the HOT water

valve using approximately 15 foot lbs of torque.

6. Repeat steps 3-5 for the COLD water valve.

(BLUE drain handle) for connection to the COLD

water inlet on the tankless water heater.

7. Connect the INLET on the COLD water valve to

the MAIN SOURCE of the water supply.

Pressure Relief Valve Maintenance:

For proper care of this approved pressure relief valve,

it is recommended that the valve is manually operated

once a year. In doing so, it will be necessary to

take precautions with regard to the discharge of

potentially scalding hot water under pressure. Ensure

discharge has a place to flow. Contact with your body

or other property may cause damage or harm.

Please note that only the PRV in this package is

certified by CSA International as an approved item.

8. Connect the OUTLET on the HOT water valve to

the HOT WATER plumbing system.

9. Ensure that both drain valve lever handles are in

the closed position (perpendicular to the drain

portion of the body).

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General Instructions

• A manual water control valve must be placed in the

water inlet connection to the Rinnai water heater

before it is connected to the water line. Unions may

be used on both the hot and cold water lines for

future servicing and disconnection of the unit.

• Toxic chemicals such as those used for boiler water

treatment are not to be introduced to the potable

water used for space heating.

• If the appliance 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.

• The piping (including soldering materials) and

components connected to this appliance must be

approved for use in potable water systems.

• Ensure that the water filter on the Rinnai water

• Purge the water line to remove all debris and air.

heater is clean and installed.

Debris will damage the Rinnai water heater.

Pressure Relief Valve

• An approved pressure relief valve is required by the

American National Standard (ANSI Z21.10.3) /

Canadian Standard (CSA 4.3) for all water heating

systems.

• The relief valve should be added to the hot water

outlet line according to the manufacturer’s

instructions. DO NOT place any other type valve or

shut off device between the relief valve and the

water heater.

• The relief valve must comply with the standard for

Relief Valves and Automatic Gas Shutoff Devices

for Hot Water Supply Systems ANSI Z21.22 and /or

the standard Temperature, Pressure, Temperature

and Pressure Relief Valves and Vacuum Relief

Valves, CAN1-4.4.

• 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.

• If a relief valve discharges periodically, this may be

due to thermal expansion in a closed water supply

system. Contact the water supplier or local

plumbing inspector on how to correct this situation.

Do not plug the relief valve.

• The relief valve must be rated up to 150 psi and to

at least the maximum BTU/hr of the appliance.

• 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. Follow local

codes. Water discharged from the relief valve could

cause severe burns instantly, scalds, or death.

• Neither Rinnai nor the American National Standard

(ANSI Z21.10.3) / Canadian Standard (CSA 4.3)

requires a combination temperature and pressure

relief valve for this appliance. However, local codes

may require a combination temperature and

pressure relief valve.

• The pressure relief valve must be manually

operated once a year to check for correct operation.

Freeze Protection

The freeze protection features include electrical

heating elements. Freeze protection may be disabled

if electricity is not supplied, or if there is an error

preventing the water heater from functioning. Loss of

freeze protection may result in water damage from a

burst heat exchanger or water lines.

The condensate trap drain plug and water drain plug

are not affected by the auto drain down solenoid valves

and will have to be manually opened.

The freeze protection features will not prevent the

external piping from freezing. Rinnai recommends

heat tracing and insulating hot and cold water pipes

connecting units. Pipe cover enclosures may be

packed with insulation for added freeze protection.

The installation of auto drain down solenoid valves is

optional. However, Rinnai strongly recommends that

these valves be installed to prevent damage from

freezing in case the normal freeze protection should

become disabled. Any product damage due to

freezing will not be covered by the warranty.

With electrical power supplied, Rinnai condensing

water heaters will not freeze when the outside air

temperature is as cold as –22ºF (-30ºC) for indoor

models or is as cold as –4ºF (-20ºC) for outdoor

models, when protected from direct wind exposure.

Because of the “wind-chill” effect, any wind or

circulation of the air on the unit will reduce its ability to

freeze protect.

In addition, the solenoid valves should be connected

electrically to a surge protector with terminals. This

allows the solenoid valves to operate if the water

heater is disabled due to an error code.

The solenoid valves and surge protector with terminals

are available for purchase at Rinnai.

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Freeze Protection Piping

Manual draining of the water heater

To avoid burns, wait until the equipment cools down before draining the water. The

water in the appliance will remain hot after it is turned off.

WARNING

If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the

water inside the water heater be drained.

To manually drain the water:

1. Shut off cold water supply and gas supply.

2. Turn off the temperature controller.

3. Disconnect the power to the water heater.

Hot water

outlet

Hot water

drain plug*

Water

filter

Water

drain

plug

4. Open hot water drain plug at the hot water outlet.

5. Remove water filter to drain the cold water.

If an isolation kit is installed, remove the drain caps on both isolation

valves and open both valves above the caps (blue and red handles).

6. Unscrew the water drain plug from the drain line next to the

hot water outlet.

7. Remove the condensate trap drain plug and allow to drain.

To resume normal operation:

1. Confirm that all water drain plugs are removed, that the gas

supply is turned off, and that all taps are closed.

2. Insert the condensate trap drain plug.

3. Screw in the water drain plugs.

Cold water

inlet

Condensate

trap drain plug

* Use a wrench or other

tool to unscrew the hot

water drain plug.

If the isolation kit was used to drain the unit, replace the drain caps and

close both isolation valves (blue and red handles).

4. Screw in the water filter in the cold water inlet.

5. Open the cold water supply.

6. Open a tap and confirm that water flows, and then close.

7. Turn on the power.

8. After confirming that the temperature controller is off, turn on

the gas supply.

9. Turn on the temperature controller.

Running a low volume of water through the water heater to prevent freezing

If the temperature exceeds the ability of the water heater to freeze

protect itself, or if power is lost, the following steps may prevent the

ON!

water heater and external piping from freezing. (Units connected with

MSA or EZConnect should be drained to prevent freezing if not in use.)

COLD

1. Turn the water heater off.

2. Close the gas supply valve.

0.1 gal/min or

about 0.2 inch

thick

3. Reduce the flow to about 0.1 gal/min or to where the stream is about

0.2 inches thick.

HOT

When the water heater or external piping has frozen

1. Do not operate the water heater if it or the external piping is frozen.

2. Close the gas and water valves and turn off the power.

3. Wait until the water thaws. Check by opening the water supply valve.

4. Check the water heater and the piping for leaks.

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Recommended Piping for Basic Installation

Hot water

drain plug

Water

drain

plug

Condensate

trap drain plug

Rinnai

Equipment List

QTY

Condensate

drain line

Rinnai

Water Heaters

RIK-KIT (Optional)

(3/4" Fittings Include:

2 Unions, 2 Ball Valves,

2 Drain Valves and

1 Pressure Relief Valve.)

Refer to the Condensate

section in the venting

instructions

3/4" Gas Connection

Condensate drain line

Condensate

drain

Gas Supply

3/4" Hot Water Supply Line

3/4" Cold Water Supply

Line

For Building Fixtures

KEY

This is not an engineered drawing. It is intended only as a guide and not

as a replacement for professionally engineered project drawings. This

drawing is not intended to describe a complete system. It is up to the

contractor/engineer to determine the necessary components and

configuration of the particular system being installed. This drawing does

not imply compliance with local building code requirements. It is the

responsibility of the contractor/engineer to ensure installation is in

accordance with all local building codes. Confer with local building

officials before installation.

Pressure Regulator

Circulating Pump

3/4" Ball Valve

3/4" Union

Check Valve

Boiler Drain Valve

Solenoid Valve

Pressure Relief Valve

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Recommended Piping for Circulation Systems

NOTE:

For residential and commercial

applications, this piping arrange-

ment maintains full warranty.

Rinnai

Equipment List

QTY

For this application:

Rinnai

Water Heaters

Pump should be controlled by an

Aquastat, Timer or Combination Aquastat

and Timer.

RIK-KIT (Optional)

(3/4" Fittings Include:

2 Unions, 2 Ball Valves,

2 Drain Valves and

Pump to be sized to maintain circulation

loop temperature.

1 Pressure Relief Valve.)

The pump should be sized to overcome

the pressure loss through the tank water

heater, and supply and return plumbing.

Reference the Rinnai Hot Water System

Design Manual, Pump Sizing for Circula-

tion.

3/4" Gas Connection

Gas Supply

Pump to be of bronze or stainless

construction.

Condensate drain line

Minimum 3/4" Cold Water Supply Line

Tank Water Heater to be Sized for

Heat Loss of Circulation Loop.

Condensate

drain

Building Supply

IMPORTANT: Connect the building

return line to the hot water supply line

as close as possible to the Rinnai Water

Heater.

Electric Water

Heater

Building

Fixtures

n T

sio

Exp