Rinnai R50LSI, R75LSI, R94LSI, R98LSI, R98LSI-ASME User Manual

Direct Vent Tankless Water Heater

Operation and Installation Manual

R50LSi ............... REU-VA2019FFUD

R75LSi ............... REU-VA2528FFUD(A)

R94LSi ............... REU-VA2535FFUD

R98LSi ............... REU-VA3237FFU

R98LSi-ASME.... REU-VA3237FFU-ASME

FOR INDOOR APPLICATIONS ONLY

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

Consumer Safety Information ..4

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

Maintenance ............................12

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

●

CSA 4.3

— Installation and service must be performed by a qualified

installer, service agency or the gas supplier.

Error Codes .............................13

Installation Instructions ............17

Consumer Support...................42

REU-VA3237FFU-ASME

This model has been built in accordance with the requirements of the ASME Boiler and Pressure Vessel Code and has received the Certificate of Authorization from the National Board. The heat exchanger on this unit has the NB and HLW stamps.

Table of Contents

Specifications ......................................................3

Consumer Safety Information

Safety Definitions .............................................4

Safety Behaviors and Practices .......................4

Safety Features ................................................4

Description of Operation ....................................5

Operating Instructions

Features Available on Temperature

Controllers ........................................................5

Temperature Controllers - Models ...............6, 7

Setting the Temperature...................................8

Temperature Options Without

a Temperature Controller .................................8

Temperature Ranges .......................................9

Setting the Sound Volume................................9

Setting the Clock ..............................................9

Using the Water Smart Bath Fill Function ......10

Overview....................................................10

Setting the Water Volume..........................10

Filling the Tub ............................................11

Setting Controller to Mute...............................11

Maintenance

Cleaning.....................................................12

Vent System...............................................12

Motors ........................................................12

Temperature Controller..............................12

Lime / Scale Buildup ..................................12

Snow Accumulation ...................................12

Visual Inspection of Flame.........................12

Error Codes

Error Code Table.......................................13,14

Trouble Shooting for Common Issues............15

Accessing Operating Information ...................15

Water Quality..................................................15

Flushing the Heat Exchanger.........................16

(Error Code: LC or 00)

Installation Instructions....................................17

General Instructions .......................................17

Clearances from Appliance ............................18

Attachment of the Water Heater.....................18

Electrical Connection .....................................19

Gas Piping

General Instructions.................................19

Pipe Sizing Procedure - Example ............20

Water Piping

General Instructions.................................21

Pressure Relief Valve ..............................21

Freeze Protection.....................................21

Freeze Protection Piping ................................22

Recommended Piping for Basic Installation ..23 Recommended Piping for

Circulation Systems .......................................24

Optional Piping for Circulation Systems.........25

Venting Instructions

Intake / Exhaust Guidelines .....................26

Condensate..............................................26

Maximum Vent Length .............................27

Vent Products ..........................................28

Flue Terminal Clearances (ANS Z21.10.3 ● CSA 4.3

Additional Clearances ....................................30

Flue Installation - Concentric Venting

(R50LSi, R75LSi, R85LSi)..............................31

Flue Installation

(R98LSi, R98LSi-ASME) ..........................32, 33

High Altitude Installation.................................34

Connecting Multiple Water Heaters................34

Temperature Controller Installation

Location....................................................35

Configurations ..........................................35

Cable Lengths and Size...........................35

Mounting the Controller............................ 36

Operating Instructions ....................................37

Technical Data

Pressure Drop Curve .....................................38

Outlet Flow Data.............................................38

Space Heating ................................................39

Dimensions.....................................................40

Ladder Diagram..............................................41

Consumer Support

Warranty Information......................................42

Limited Warranty ......................................42, 43

).............................29

2 VA Series Indoor LS Manual

Specifications

Model

Minimum Gas Consumption Btu/h 15,000 19,000

Maximum Gas Consumption Btu/h 150,000 180,000 237,000

Hot water capacity (Min - Max) *

Hot water capacity (45°F rise)

Default Temperature Setting (no controller) 120º F (49º C)

Temperature Controller Default Setting 104º F (40º C)

Maximum Temp Setting (commercial **) 160º F (71º C) 185º F (85º C)

Maximum Temp Setting (residential)

see Temperature Ranges for more information

Minimum Temperature Setting 98º F (37º C)

Weight 50 lb (23 kg) 55 lb (25 kg)

Efficiency Rating

Noise level

Electrical Consumption

By-Pass Control

Minimum Gas Supply Pressure

Maximum Gas Supply Pressure

Type of Appliance Direct Vent, Temperature controlled continuous flow gas hot water system.

Operation With or without remote controls, mounted in kitchen, bathroom, etc.

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

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

Ignition System Direct Electronic Ignition

Electric Connections Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital)

Water Temperature Control Simulation Feedforward and Feedback.

Water Supply Pressure Minimum Water Pressure: 20 PSI (Recommended 30-80 PSI for maximum performance)

Maximum Water Supply Pressure 150 PSI

Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG)

Normal 79 W 99 W

Standby

Anti-frost Protection

Natural Gas 5.0 inch W.C.

Propane 8.0 inch W.C.

Natural Gas 10.5 inch W.C.

Propane 13.5 inch W.C.

R50LSi

0.6 - 5.0 GPM

(2.3 - 18.9 L/min)

5.0 GPM

(18.9 L/min)

100 W 116 W

R75LSi

0.6 - 7.5 GPM

(2.3 - 28.4 L/min)

6.7 GPM

(25.4 L/min)

Fixed Electronic

R94LSi

199,000 Natural

Gas

190,000 Propane

0.6 - 9.4 GPM

(2.3 - 35.5 L/min)

7.1 GPM

(27.0 L/min)

140º F (60º C)

84.0%

49 dB

2 W

R98LSi

0.6 - 9.8 GPM

(2.3 - 37 L/min)

(32.2 L/min)

R98LSi-

ASME

8.5 GPM

* 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.

VA Series Indoor LS Manual 3

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.

DANGER

WARNING

CAUTION

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

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

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.

• 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.

• This appliance is equipped with a three-prong plug for your protection against shock hazard and should be plugged directly into a properly grounded threeprong receptacle. Do not cut or remove the ground prong from this plug.

• 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.

• Flame Failure: The appliance will automatically shut down if the burner flame is extinguished.

• Power Failure: The appliance will cut off the gas if it loses electrical power.

• Power Surge Fuse: A glass fuse protects against overcurrent. If the fuse blows then all indicator lamps will be off.

• Fusible Link: In case the overheat feature does not prevent the temperature from rising then the fusible link will break shutting off the appliance.

4 VA Series Indoor LS Manual

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. This appliance is direct vent where air is brought in from the outside and combustion gases are exhausted to the outside.

While electricity, water, and gas supplies are connected, the Rinnai water heater produces hot water whenever a hot water tap is open.

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.

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.

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.

MC-91

Features

MC-100

MCC-91

BC-100

MC-502

Description

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

Call

Clock

Error Codes

Function

In Use Indicator

ON/OFF Button

Power Save

Priority Button / Indicator

Sound Volume

Temperature Display

Thermostat

12 hour AM/PM clock.

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

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

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

Used to turn the water heater ON or OFF.

Indicates that this controller is setting the temperature . Priority

Used to adjust the voice prompt volume.

Shows the temperature setting.

Increases or decreases the temperature setting.

Allows the temperature controller to be in an energy saving

not an intercom.

display on models MC-91, MCC-91, and MC-502; and flashes at the clock display on models MC-100 and BC-100.

open).

mode.

can be switched to another controller by pressing its Priority Button when no hot water is running.

Water Smart / Bath Fill Button / Indicator

Water Volume

VA Series Indoor LS Manual 5

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

with a predetermined volume of water.

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

Function.

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

Thermostat

MC-502RC-1US-S * (Wireless)

Dimensions (inches): 4.33 W x 5.90 H x 1.16 D

Temperature

Display

Thermostat

ON/OFF

Button

ON/OFF

Button

Priority

Indicator

In Use

Indicator

Priority

Button

* Requires the transceiver, MC-

502RC-1US-M, to be connected to the water heater.

Refer to the MC-502RC-1US-S manual and the Wireless Controller Installation Instructions for complete details on features, operation, and installation.

6 VA Series Indoor LS Manual

Temperature Controllers - Models

BC-100V-1US

Dimensions (inches): 8.0 W x 4.125 H x 0.875 D

NOTICE

Priority

Button and

Indicator

Call

Clock

The BC-100V controller is water resistant. Avoid splashing the controller.

In Use

Indicator

Temperature

Display

Water Smart

Bath Fill Indicator

ON/OFF

Button

Water Smart

Bath Fill

Button

Power Save

Water Volume

Thermostat

Dimensions (inches): 5.0 W x 4.75 H x 0.75 D

Sound Volume

In Use

Indicator

Temperature

Display

Clock

Call

MC-100V-1US

Thermostat

Function

Priority Button

and Indicator

ON/OFF

Button

VA Series Indoor LS Manual 7

Setting the Temperature

DANGER

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.

The priority can only be changed

while no hot water is running.

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.

Water temperatures over 125º F (51º 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 (48º 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.

NOTICE

While any hot water is being provided, the temperature setting can only be adjusted between 98º F and 110º F.

Check local codes for the maximum water temperature setting allowed when used in nursing homes, schools, day care centers, and all other public applications.

2. Press the ▲ or ▼ buttons to obtain the desired temperature setting.

All hot water sources are able to

provide water at this temperature setting until it is changed again at this or another temperature controller.

NOTICE

If a newly installed unit with a 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.

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.

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 dip switch.

Set dip switch 5 to ON to obtain 140º F water temperature setting.

Set dip switch 5 to OFF (default) to obtain 120º F water temperature setting.

WARNING

DO NOT adjust the other dip switches unless specifically instructed to do so.

120º F (49º C) 140º F (60º C)

Switch No.

O F F

Switch No.

O F F

8 VA Series Indoor LS Manual

Temperature Ranges

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

R50LSi R75LSi

R94LSi R98LSi

R98LSi-ASME

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

* 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 (51º 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.

Suggested temperatures are

98 100 102 104 106 108 110 115 120 125 130 135 140

Temperature Settings Available (ºF)

150 * 160*

150* 160* 185

66 * 71 * 85

These temperatures are suggestions only.

• Kitchen 120 ºF (49º C)

• Shower 98º - 110º F (37º - 43º C)

• Bath Fill 102º - 110º F (39º - 43º C)

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.

A temperature lower than 98º F (37º C) can be obtained at the tap by mixing with cold water.

Setting the Sound Volume (Voice Prompt)

MC-100V Press the “Function” button to

adjust the voice prompt 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.

Medium Volume

(default)

High Volume

Off Volume

(beep)

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 through the volume levels in the order below.

Off Sound

(no beep)

Low Volume

VA Series Indoor LS Manual 9

Using the Water Smart / Bath Fill Function

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.

The temperature settings for the bath fill function are limited to those in the table below.

Bath Fill Temperature Settings Available

ºF 98 100 102 104 106 108 110 115 120

ºC 37 38 39 40 41 42 43 46 49

NOTICE

Multiple

Water

Heaters

NOTICE

Power

Loss

NOTICE

Anti-scald

Fixtures

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.

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.

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.

Do not use with single handle fixtures that have anti-scald features built into them. These fixtures allow a 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.

2. Press the “Temp” ▲ or ▼ buttons to obtain the desired temperature setting.

3. Press the “Water Vol.”▲ or ▼ buttons to obtain the desired water volume in gallons.

NOTICE

To Prevent

Over Filling

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:

• Monitor and remain by the bath while the water is running.

• Use a low bath fill volume less than 25 gallons

10 VA Series Indoor LS Manual

Using the Water Smart / Bath Fill Function

Filling the Tub

ON!

HOT

COLD

1. Press the “Water Smart / Bath Fill” button once. The button will illuminate, a tone will sound, and the word “Bath” will appear next to the temperature setting.

2. The voice prompt will announce “The hot water system is ready. Open the hot water tap.” Open the hot water tap. The “In Use” indicator will illuminate on all controllers. The hot water will begin to flow.

NOTICE

To Stop the Bath Fill Before it Finishes

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.

ON!

HOT

COLD

3. When the preset volume of water has been produced then

• the water flow will cease

• 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.”

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 and the word “Bath” will disappear from the display.

NOTICE

When

Other Taps

Are Open

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.

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.

VA Series Indoor LS Manual 11

Maintenance

WARNING

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.

Cleaning

It is imperative that control compartments, burners, and circulating air passageways of the appliance be kept clean.

Clean as follows:

1. Turn off and disconnect electrical power. Allow to cool.

2. 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.

Snow Accumulation

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.

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.

The flame pattern should be as shown in the figures below.

5. Use soft dry cloth to wipe cabinet.

Vent System

The vent system 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”.)

12 VA Series Indoor LS Manual

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.

WARNING

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

No burner operation during freeze protection mode

Power interruption during Bath Fill (Water will not flow when power returns).

Air Supply or Exhaust Blockage

No Ignition Check that the gas is turned on at the water heater, gas meter, or cylinder.

Flame Failure Check that the gas is turned on at the water heater and gas meter. Check for

Service Call

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

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. Ensure condensation collar was installed correctly. Verify dip switches are set properly. Check fan for blockage.

Ensure gas type and pressure is correct. 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 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.

obstructions in the flue outlet. 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 condensation collar was installed properly. 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.

™ or MSA controls to isolate the problem.

VA Series Indoor LS Manual 13

Code Fault Remedy

No code

Thermal Fuse 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. 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.

Over Temperature Warning

Outgoing Water Temperature Sensor Fault

Heat Exchanger Outgoing Temperature Sensor Fault

Combustion Air Temperature Sensor Fault

Modulating Solenoid Valve Signal Abnormal Combustion Fan Failure

Water Flow Control Fault

SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault Flame Sensing Device Fault

Scale Build-up in Heat Exchanger (when checking maintenance code history, “00” is substituted for “LC”)

Nothing happens when water flow is activated.

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. Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor. Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor. Check for restrictions in air flow around unit and vent terminal. Check sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Ensure fan blade is tight on motor shaft and is in good condition. Replace sensor. Check modulating gas solenoid valve wiring harness for loose or damaged terminals. Measure resistance of valve coil. 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. Check wiring harness to all solenoids for damage and/or loose connections. Measure resistance of each solenoid valve coil.

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. 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.

Clean inlet water supply filter. On new installations ensure hot and cold water lines are not reversed. Check for bleed over. Isolate unit from building by turning off hot 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.

14 VA Series Indoor LS Manual

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