Bradford White RTG-L-199-N1, RTG-K-160-N1, RTG-R-199-X1 User Guide

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Infiniti® Series Tankless

(Condensing) Gas Water Heater

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

(Indoor)

(Outdoor)

Models Covered

by This Manual:

Indoor Gas:

RTG-K-160-N1 RTG-K-199-N1 RTG-L-160-N1 RTG-L-199-N1

Outdoor Gas:

RTG-K-160-N2 RTG-K-199-N2

TRAINING AND SERVICE INFORMATION This document is restricted to exclusive use by the official service partners.

Indoor Propane:

RTG-K-160-X1 RTG-K-199-X1 RTG-L-160-X1 RTG-L-199-X1

Outdoor Propane:

RTG-K-160-X2 RTG-K-199-X2

Manual 238-53328-00B REV 6/21

Save this manual for future reference

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Table of Contents

1. INTRODUCTION ......................................................................................... 3

2. APPLIANCE DESCRIPTION ...................................................................... 3

2.1 APPLIANCE DESIGNATION ..................................................................................................... 3

2.2 AVAILABLE ACCESSORIES ..................................................................................................... 4

3. INSTALLATION............................................................................................ 5

3.1 APPLIANCE MOUNTING ON THE WALL .................................................................................. 5

3.2 WATER CONNECTIONS ......................................................................................................... 7

3.3 GAS CONNECTION ................................................................................................................ 8

3.4 APPLIANCE PERFORMANCE .................................................................................................. 9

4. COMPONENTS OVERVIEW ................................................................... 10

4.1 CONTROL PANEL FOR USER (INDOOR VERSION) ............................................................... 11

4.2 CONTROL PANEL INBUILT (OUTDOOR VERSION) ............................................................... 17

4.3 CONDENSATE SIPHON ........................................................................................................ 21

4.4 HEAT CELL .......................................................................................................................... 22

4.5 GAS MANIFOLD ................................................................................................................... 23

4.6 FAN ...................................................................................................................................... 27

4.7 GAS VALVE.......................................................................................................................... 28

4.8 HEAT EXCHANGER .............................................................................................................. 29

4.9 WATER VALVE ..................................................................................................................... 30

4.10 CIRCULATION PUMP (L-SERIES ONLY) ............................................................................ 31

4.11 WATER TEMPERATURE SENSORS ................................................................................... 35

4.12 BOX TEMPERATURE SENSOR .......................................................................................... 35

4.13 ELECTRODES ................................................................................................................... 36

5. WORKING PRINCIPLE / ELECTRIC MEASUREMENTS .................... 38

6. AFTER SALES SERVICE ......................................................................... 48

6.1 PCB REPLACEMENT: .............................................................................................. 48

7. MAINTENANCE ......................................................................................... 56

8. TROUBLE SHOOTING ............................................................................. 61

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Segment

Model #

Description

RTGK160N1

160 KBTU/NATURAL GAS/INDOOR

RTGK199N1

199 KBTU/NATURAL GAS/INDOOR

RTGL160N1

160 LBTU/NATURAL GAS/INDOOR

RTGL199N1

199 LBTU/NATURAL GAS/INDOOR

RTGK199X1

199 KBTU/PROPANE/INDOOR

RTGK160X1

160 KBTU/PROPANE/INDOOR

RTGL160X1

160 LBTU/PROPANE/INDOOR

RTGL199X1

199 LBTU/PROPANE/INDOOR

RTGK199N2

199 KBTU/NATURAL GAS/OUTDOOR

RTGK160N2

160 KBTU/NATURAL GAS/OUTDOOR

RTGK199X2

199 KBTU/PROPANE/OUTDOOR

RTGK160X2

160 KBTU/PROPANE/OUTDOOR

1. Introduction

This manual is a complement to the instruction/operation manual delivered with the appliance, with the main important technical details that are relevant for the official service partners and trainers

in the country.

2. Appliance Description

This appliance is a fan pressurized gas water heater offering a wide range of modulation and installation advantages with both indoor and outdoor models available.

2.1 Appliance Designation

The designation allows the identification of the main characteristics of the units, especially when a report is needed through Bradford White Tech Services.

Infiniti Tankless™ K and L Series

INDOOR

OUTDOOR

Table 1 – Appliance Identification

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Activation

Deactivation

box

≤ 5ºC / 41ºF

box

≥ 10ºC / 50ºF

2.2 Available Accessories

Anti-Freeze Kit

Allows the protection of the appliance against water freezing inside of its pipes / heat exchanger. The anti-freeze kit can be used where ambient temperatures are as low as -30°F/-35°C for short periods of time.

Additional measures must be taken to the surrounding pipes connected to the unit in case it is installed in a place where freezing temperatures are constant.

The heating elements in the Anti-Freeze kit are protected by ceramics and are clipped to the copper pipes.

Figure 1 – Anti-Freeze Kit

The kit includes 16 resistances for the indoor version and 13 resistances for the outdoor version, which activate under conditions from table 2. Each resistance has +/- 16W of expected dissipated power.

Table 2 – Anti-freeze activation conditions

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Requisite

Confirmation

Appliance is levelled and in the vertical position?

Delivered accessories are used accordingly?

Appliance is supported exclusively by the wall mounting and not by hydraulic and/or gas connections?

3. Installation

The installation manual of each product must be checked and used by the installer to optimize and

leave the appliance in correct operation conditions.

Check Lists for Technicians/Installers:

3.1 Appliance Mounting on the Wall

Table 3 – Check List for Mounting

Figure 2 – Pre-installation distances for Indoor appliance (left) and outdoor appliance (right)

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Figure 3 – Wall mounting preparation using supplied wall hung bracket

Figure 4 – Wall mounting for indoor appliance (left) and outdoor appliance (right)

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Requisite

Observations

Confirmation

Water pipes were cleaned

the appliance?

- Minimum pressure: 1.2 bar / 18

PSI

3.2 Water Connections

before being connected to

Inlet water filter was checked and is cleaned, ensuring the necessary water flow rate?

Accessories for water connections are adequate and without water leak?

Water pressure and flow are according to the appliance specifications?

Table 4 – Check List for Water Connections

PSI

- Maximum pressure: 10 bar / 150

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Requisite

Confirmation

The appliance is suitable for the available gas type?

Pressure reducer and gas pipe are adequate for the required pressure and

Accessories for gas connection are adequate and according to the country

3.3 Gas Connection

Unit Supplied as NG (without gas flow restrictors)

Unit set up for LP (with gas flow restrictors)

gas flow? Refer to manual recommendations.

specification/standards?

Table 5 – Check list for Gas Connections

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GAS

MANOMETER

Figure 5 – Manometer pipe connection to measure static/dynamic gas supply pressure

3.4 Appliance Performance

Measure water flow and temperature increase to check temperature and instantaneous water flow,

assuring correct operation of the appliance.

Figure 6 – Use of Water Flow Meter and Thermometer

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1 – Fan

9 – Primary heat exchanger

2 –

10 –

3 – Control unit

11 – Condensate collector

4 – Gas restrictor

12 – Bypass valve

5 – HMI for installer (outdoor version)

13 – Gas valve

6 – Manifold

14 – Water valve (Stepper motor+Flow sensor)

7 – Burner

15 – Temperature sensor (inlet water)

8 – Gas tube

16 – Temperature sensor (outlet water)

17–

4. Components Overview

Exhaust tube

Figure 7 – Internal View of Model – Indoor: L-Series (left) and Outdoor K-Series (right)

Secondary heat exchanger

Built-in recirculating pump (L-Series only)

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4.1 Control Panel for User (Indoor Version)

The control panel, located on the front cover of the appliance, allows the final user to control the operations needed. The following figures show the overall control panel and the display icons, respectively. See Table 8 for more display icon information.

Figure 8 – Control Panel on the Front Cover of the Appliance (Indoor Version)

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Figure 9 – Display LCD Description

Control Panel Operation:

Power:

• To start the appliance, press the On/Off button.

• To shut down the appliance, press the On/Off button again.

Reset Errors:

• Some error codes can be solved by resetting the appliance. To do this, press and hold the On/Off button for more than 3 seconds. The appliance will initiate the start-up sequence.

Set Water Temperature:

• By default, the unit is set for 120 °F.

• Press the Up or Down button until you reach the desired temperature.

• Once the user has selected the desired temperature and would like to set this as the default

temperature, press the P button for 3 seconds. The selected temperature will blink. Once this is completed, the default temperature is saved.

• If the desired temperature setpoint is above the limit of the appliance, the user must change the Setpoint Limit (continue reading below).

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Display

Description

Information

Gas Type

Purge

Settings

Temperature Limit

Appliance Type

Bypass

Actuator Calibration

ICC

Exit

L2 Gas Adjust

Maximum Power

Minimum Power

Automatic Calibration

Powerbus Address

Control Panel Sub-Menus:

To access the sub-menus, simultaneously press the P, Up, and Down buttons for 3 seconds. The display should default to displaying P4. The available sub-menus are:

Table 6 – LCD Sub-Menus

To navigate the sub menus, press the Up or Down buttons. To enter a sub menu, press the P button. If you would like to exit a sub menu, or the menu all together, navigate the Up or Down buttons until the display shows E. Press the P button to Exit back to the previous menu, or back to the main display. Holding the P button for 3 seconds or more will confirm a change. The display will blink while a change is being saved.

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P4 - Information

Chamber NTC - Water Temperature at exit of heat exchanger

Inlet NTC - Current temperature of the temperature sensor of the water inlet pipe

Outlet NTC - Current temperature of the temperature sensor of the water outlet pipe

Flow - Total water flow through the unit. Includes flow through both the main and bypass valves

Barometric Pressure - Current barometric pressure at installation location

Fan Speed - Current fan speed (Hz.)

Output Power - Current burner power %

SS Hex NTC - Temperature sensor of the flue gases between the Primary and Secondary Heat Exchanger

Exhaust Gas NTC - Temperature sensor of the flue gases at the exhaust

Ambient NTC - Current temperature inside the cabinet. Sensor is located near the fan.

10d

External Tank - Current temperature on the external tank (if connected)

Exit - (Return to P4 menu)

First most recent error code

Second most recent error code

Third most recent error code

Fourth most recent error code

Fifth most recent error code

Sixth most recent error code

Seventh most recent error code

Eighth most recent error code

Ninth most recent error code

10F

Tenth most recent error code

Exit - (Return to P4 menu)

OD - Operation Data

FH - Failure History

P7 - Gas Type

nA Natural Gas (NG)

LP Liquid Petroleum Gas (LPG)

P4 – Information Menu: Displays informational data regarding the unit. This submenu can be useful for diagnosing the appliance, as needed.

P7 – Gas Type Menu: This menu allows selection of the gas type for the appliance. Improper gas type will affect appliance performance and can lead to unsafe operating conditions. To change the gas type, press the Up and Down buttons to the correct gas type. Press the P button to set the appliance to the specific gas type. See the Manifold section for more information on gas type conversion.

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P9 – Purge: This menu allows the blower to run, purging the exhaust venting. To engage this function, use the Up and Down buttons to select P9. Within 2-5 seconds, the fan should begin working. To exit this function, use the Up and Down buttons to move to a different menu.

SA – Settings: This menu allows several different settings for the appliance to be changed, such as recirculation loop, units (°F/°C), etc. A summary of menu options is as follows:

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PE - Appliance Type

TP Appliance Type

Appliance Power ( 160/199) kBtu

Appliance model (IN/OU: indoor/outdoor)

E Exit

PF - Bypass Activation

EN Enable

DI Disable

PA - Actuator Calibration

bP Bypass Actuator Calibration nF Main Water Actuator Cal.

LM – Temperature Limit: This setting allows the maximum setpoint limit of the appliance to be set. The maximum temperature for a residential model is 140 °F. To change the limit, access the SL menu, and set the desired limit with the Up and Down buttons. You can also turn off the limit by selecting OF (off) in the limit menu. Pressing the P button for 3 seconds will save the changes.

PE – Appliance Type: This menu allows changes to several options, including: appliance type, power, and model. After initial setup, this menu should not be accessed.

PF – Bypass Activation: This menu allows the main bypass valve to be activated or deactivated. Normal state is for this valve to be activated: allowing the bypass valve to function will let the appliance maintain better temperature stability and overall optimized performance.

PA – Actuator Calibration: This menu controls access to the calibration of the two water valves. The main valve controls overall water flow to the appliance: if water flow exceeds the heating capacity of the appliance, the main valve will restrict water flow to allow the appliance to maintain temperature setpoint. The Bypass valve allows colder inlet water to be blended with water from the heat exchanger, to create a consistent outlet water temperature. Both calibrations require water to be flowing before beginning the calibrations. Further details on the process of the calibrations can be found in this manual or the Installation/Operation Manual.

IC – Ionization Correction: This menu controls the parameter for the ionization correction model. The ionization control model is an auxiliary method for the appliance to determine air flow during operation. Using this parameter allows greater reliability in operation. There are two different options for IC: on or off. Default is on; there are no real applications where it would be beneficial for IC to be turned off. Ionization control is a menu option in the P1 menu (see P1 menu table below); here it is default-set to off. Because P1 is a manual calibration, it is best operating procedure to again leave the default setting.

E – Exit: This allows exiting from the main menu back to the home screen of the display. Scrolling to the “E” option within the menu or submenu will always allow the user to move back to the previous menu.

P0 – L2 Gas Adjust: This menu allows for the verification of minimum power adjustment. There are two different options for P0: on or off. The default setting is off. Again, it is best operating procedure to leave the default setting.

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P1 - Maximum Power

A1 High Fire Air Adjustment

L1 High Fire Gas Adjustment

b1 Low Power Air Flow Calibration

rP Reset Parameters

IC Ionization Correction

E Exit

P2 - Minimum Power

A2 Low Fire Air Adjustment

L2 Low Fire Gas Adjustment rP Reset Parameters

E Exit

P1 – Maximum Power: This menu allows adjustment to the fuel/air ratio at maximum power. This is a manual adjustment; before proceeding, read about the procedure in the Installation/Operation manual.

P2 – Minimum Power: This menu allows adjustment to the fuel/air ratio at minimum power. This is a manual adjustment; before proceeding, read about the procedure in the Installation/Operation manual.

UC – Automatic Calibration: This menu begins the process of performing the appliance’s automatic fuel/air ratio adjustment. After entering this menu, the display will show “01”, indicating the first step of the adjustment. Do not perform the automatic calibration without first reading about it in the Installation/Operation manual.

P3 – Powerbus Address: This menu allows the selection of a powerbus address for a wired remote control. The default address is 20.

4.2 Control Panel Inbuilt (Outdoor Version)

The control panel, located inside the appliance, allows the installer or technician to perform all the different operations needed during commissioning / diagnostic procedures, as described above in the indoor section. The buttons and functionality of the control panel is the same between the indoor and the outdoor models.

Figure 10 – Wired Control inside the Appliance (Outdoor Version)

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On / Off button

longer, errors are reset.

The main switch is assembled on

the PCB and disconnects the unit.

Anti-Freeze function is assured

even in the OFF position

When pressed for 3 seconds or

Program Button

Used to enter in to different

- “Enter” in service mode

- Scroll in the service mode menu

- Save value or adjust set values

- Save a temperature set (user)

Note:

services:

navigation on parameters inside

Table 7 – Control Panel Buttons

Selection button

Used to select temperature

values, adjustments and

the visualisation mode.

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Symbol

Description

Observation

Warning symbol:

Solar application:

Temperature Unit:

ºC – default value

ºF – alternative value

Power bar indicator:

Indication of the current

operation power

Flame indication:

Indication of flame in the

burner

Combined with an error

indication / warning code

indicates a faulty

performance

Selection can be done by

changing default value on

service mode

Indicative Value (in %)

Note: each line corresponds to

10%

Symbol displayed when

ionization is detected - flame

presence

Tap symbol:

Indication of not enough power to reach set point

Indication that the automatic

solar function is activated,

meaning that the appliance

is receiving pre-heated inlet

water, with no need for

In case symbol is displayed,

decrease (-) or increase (+)

flow accordingly

The symbol is displayed and

burner is shutdown when T in

is under following conditions:

≥ T

set

– 1K

burner to start

Fan operation:

Indication that the fan is in

operation

Table 8 – Display Symbols

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Figure 11 – Disassembling the Control Panel for Installer

To disassemble this HMI, the necessary steps are the following:

1. Pull the HMI (Remember that a cable is still connected.

2. Disconnect the cable.

3. Loosen the 2 screws.

4. Rotate the base of the HMI and pull it.

5. Remove the support of the HMI.

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4.3 Condensate Siphon

The appliance includes a condensate siphon which stores condensate generated during operation from the condensate collector below the stainless-steel condensing heat exchanger. The siphon must also connect to an adequate PVC drainage pipe (1) to drain the acidic condensate once full. As this unit is a high-efficiency appliance, condensate flow can be as high as 2 gallons per hour at full power.

Figure 12 – Condensate Siphon

Figure 13 – Disassembling the Condensate Siphon from the Unit

To disassemble the siphon from the metal box and heat cell the necessary steps are the following:

1. Pull the tube between the siphon and the condensate collector.

2. Remove the screws on the bottom of the appliance.

3. Pull the siphon out.

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1 – Burner

4 – Stainless Steel Condensing unit

2 –

5 –

3 – Copper Heat exchanger

4.4 Heat Cell

The heat cell includes a heat exchanger with flame sight window, ignition and ionization electrodes, condensing unit, and condensate collector.

To disassemble the heat cell from the metal box the necessary steps are the following:

1. Remove the condensate collector (2 screws)

2. Remove the control unit (2 screws and cables)

3. Loosen the gas tube on the manifold

4. Remove the 4 screws from the gas valve

5. Remove the clips between the heat cell and all the water tubes.

a. Cold water tube from the condensing unit b. Hot water tube from the heat exchanger

Electrodes

Condensate collector

Figure 14 – Heat Cell

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4.5 Gas Manifold

The gas manifold is a gas distribution pipe with integrated drilled injectors.

Figure 15 – Disassembling the manifold from the heat cell

To disassemble the manifold from the burner the necessary steps are the following:

1. Remove the fan

2. Disconnect the solenoids from the top left of the manifold

3. Disconnect the segmentation safety valves

4. Remove the HMI for installer (see figure 13). In the first picture the HMI is already removed except its base.

5. Remove 4 screws from the manifold to separate it from the burner.

6. Loosen the screw from the gas tube.

7. Rotate and push up the manifold at the same time to remove it from the appliance

To assure a wide modulation range for the appliance, the manifold cover allows the gas supply to be utilized across 3 different segments.

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1 – Burner segment 1

4 – Gas restrictor seal

2 – Burner segment 2

5 – Gas seal

3 – Burner segment 3

6 – Segmentation safety valves

Figure 16 – Disassembling the Manifold

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As shown in the previous figure, the manifold contains 3 solenoids valves (SV) that are responsible for the release of gas in each burner segment. This allows the unit to have 6 burner level stages according to the solenoid combination:

Stage 1 – SV 1 Stage 2 – SV 2 Stage 3 – SV1 + SV2 Stage 4 – SV3 Stage 5 – SV1 + SV3 Stage 6 – SV1 + SV2 + SV3

The manifold is only available as one spare part. However, for maintenance purposes it may be required to open the manifold. The Gas Seal is made of cork and is not available as an individual spare part.

For maintenance purposes the process of disassembling the manifold has the following steps:

1. The manifold is already separated from the appliance. If not, follow the steps in Figure 15.

2. Remove the gas restrictor seal (4 screws) (see figure below)

3. Remove the front cover (12 screws)

4. Remove the cork seal

5. Remove the rubber seal from the reverse side of the manifold. Every time that the manifold is disassembled, this seal must be replaced.

The new manifold allows the installer or technician to easily convert the appliance between natural gas (NG) and Liquid Propane Gas (LPG). The appliance comes factory installed in NG configuration, so if the unit is being used in a NG application, no additional modification is necessary. To operate the unit with LPG, a gas restrictor must be installed, as detailed in the following figures.

Figure 17 – Gas Restrictor Seal on the manifold (unit set up for natural gas operation)

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Figure 18 – Gas Restrictor Diaphragm for Propane Operation

Figure 19 – Gas Conversion Procedure for LPG Operation

For gas restrictor conversion, the manifold doesn’t need to be disassembled. The steps for restrictor conversion are:

1. Disassemble the gas restrictor seal by removing the 4 screws.

2. If the appliance is working with NG, there is no restrictor inside. If the appliance is working with LPG, there is a rubber diaphragm with 3 restrictors.

3. Remove the diaphragm if the objective is to convert the appliance from LPG to NG or install the diaphragm if the objective is to make the conversion from NG to LPG.

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4.6 Fan

The control unit monitors the primary air flow to the burner by varying the fan motor power supply voltage (DC), ensuring a correct variable speed according to the output needed.

The fan motor provides an additional control signal to enable/disable operation and the speed of the fan is measured by the feedback signal provided by the fan’s motor. The signal consists of a square wave with a frequency proportional to the speed of the fan.

Additionally, this system allows the appliance to detect the size of the installed vent pipes and adapt the fan to the exhaust needs.

Figure 20 – Disassembling the Fan

Disassembly of the fan does not require removing the control unit. The steps for fan removal are:

1. Disconnect the gas sensor.

2. Disconnect the segmentation safety valves.

3. Remove the front screw.

4. Remove the fan paying attention to the fan base (the fan is trapped on the back).

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4.7 Gas Valve

It is possible to control gas flow to the burner by the modulating gas valve (MV) in addition to the control unit. The gas valve is composed of an additional solenoid identified as safety valve (SV1) releasing the modulated gas to and from the solenoid gas valve.

Safety Solenoid Valve

The safety valve (SV) is the first safety element that releases gas to the burner. The second safety level elements are the solenoid valves in the gas manifold of the burner. They release gas to the first, second, and third burner segments, respectively, acting as safety and segmentation valves.

Figure 21 – Gas Valve View

Modulating Valve

Mechanical modulated valve The gas flow (thermal load) is automatically modulated to ensure the correct outlet water

temperature, even under water flow or inlet temperature variations.

To disassemble the gas valve, the necessary steps are the following:

1. Release the nut on the gas tube.

2. Remove the 4 screws on the buttons of the appliance.

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4.8 Heat Exchanger

The copper heat exchanger has different size and fin amounts according to the appliance model (160 or 199). This configuration ensures the sealed heat transfer from the flame heat to the water that flows through the copper pipes.

Figure 22 – Heat exchanger

To disassemble the heat exchanger from the entire heat cell the necessary steps are the following:

1. Disassemble the heat cell from the appliance (See Section 4.4)

2. Remove burner (8 screws). Remove condensing unit (8 screws).

3. The seals must be always replaced when the heat exchanger is disassembled.

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Flow (g/min)

7.13

6.34

4.75

3.69

2.64

2.11

1.05

0.52

4.9 Water Valve

The inlet water valve contains the flow sensor responsible for the flow rate detection and a motor stepper responsible for the maximum water flow control through the unit.

Figure 23 – Inlet Water Valve

Water flow is measured by a turbine flow sensor that is fed by a DC signal and gives a feedback signal proportional to the measured water flow (see Table 9).

• Minimum Flow rate to start up the appliance: 0.45 gpm (1.7 l/min)

• Flow rate to shut off the appliance: < 0.5 gpm (1.8 l/min)

In case Q > min start up flow following P

• If Pout > Minimum Power, the appliance will run with the calculated minimum water flow, in order to reach the set point with a temperature stability of +/- 2ºF (+ / - 1ºC);

• If P out < Minimum Power, the T out is assured by a pulsating burner mode + cold water mixing (easy minimum).

Flow [l/min]

Table 9 – Water Flow Sensor Values

verification occurs:

out

Frequency [Hz]

108

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WARNING

Figure 24 – Inlet Water Valve Composed by a Motor Stepper (left) and a Flow Sensor (right)

In order to disassemble the water valve, it is necessary to remove the clips attaching the valve to the water piping. Note that the motor stepper and the flow sensor are one only spare part. However, for maintenance purposes it may be required to open the water valve.

4.10 Circulation Pump (L-Series only)

The circulation pump is responsible for recovering the home re-circulation loop to minimize wasted water and increase user comfort.

Before performing any service, ensure the power is disconnected from the appliance.

Figure 24 – Circulation Pump

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Disconnect

Removing Circulation Pump for Servicing

1. Remove the Water Valve prior to pump service (refer to Section 4.8). Once the Water Valve has been removed, disconnect the pump harness.

Figure 26 – Step 1: Disconnect Wire Harness

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Figure 26 – Step 2: Unclip Anti-Freeze

Resistors

Figure 27– Step 3: Remove the clips holding in the pump outlet and inlet pipes.

Unclip Both

Remove Clips

2. Remove clips holding the anti-freeze resistors, then remove the anti-freeze heaters from the water pipes as shown below.

3. Remove the clips holding in the pump outlet and inlet pipes.

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Remove Screws

4. Using a T20 Torx driver, remove the 4 screws holding the pump bracket.

Figure 28– Step 3: Remove 4 Screws

5. Finish disconnecting the pump inlet pipe and remove the circulation pump from the cabinet.

6. Service circulation pump as necessary. Reverse Steps 1-5 to reassemble circulation pump once servicing is complete.

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4.11 Water Temperature Sensors

The outlet and inlet water temperature is measured by a 10kΩ NTC (See Table 13). Both NTC are equal, but connected to different cable colors (blue wires to inlet water / red wires to outlet water).

Figure 29 – Outlet Water Temperature Sensor (left) and Inlet Water Temperature Sensor (right)

4.12 Box Temperature Sensor

The Box air temperature is measured by a 220kΩ NTC (See table 12) and is assembled on the control unit back panel, in order to monitor the temperature inside of the sealed box.

Figure 30 – Box Air Temperature Sensor

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A -

Ionization electrodes

B -

Ignition electrodes

4.13 Electrodes

The spark generation is started immediately before opening the gas valve and stopped when ionization is sensed. The flame is sensed through an ionization electrode, and detection is granted for ionization currents greater than 0.5 micro-amps (µA).

Figure 31 – Electrodes Overview

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1st & 2nd Ignition Sequence

Safety Time = 23 sec

1st Attempt

(3 sec)

Purge Period

(3 sec)

2nd Attempt

(3 sec)

Purge Period

(3 sec)

3rd Attempt

(3 sec)

Post Purge

(8 sec)

3rd Ignition Sequence Safety Time of 15 sec + 30 sec

1st Attempt

(3 sec)

Purge Period

(3 sec)

2nd Attempt

(3 sec)

Purge Period

(3 sec)

3rd Attempt

(3 sec)

Post Purge

(30 sec)

Ignition Electrode

To prevent harder than necessary ignition cycles and to ensure the correct gas supply and burner stability conditions, the following situation is verified during the safety time period.

During each ignition attempt, the system monitors the ionization signal; this signal drives the start of normal operation. However, in the case where the ionization signal is not detected during the ignition sequence, the failure code EA will flash on the display. When this occurs, a non-volatile lock-out is activated, and only a manual reset will allow the system to resume normal operation. Finally, if the ionization signal is interrupted during normal operation, the ignition sequence shown below is re-started.

Fan Ignition spark

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Connection to

the control unit

Flow Sensor

Input

120 V

60 Hz

Thermal fuse with

continuity

Ionization reading

Input

0 µA

Ohm Value inside

range

Turbine detects water

flow

Frequency value

to control unit

electrodes

Gas valve solenoid

activation

Ionization detection

(spark stops)

Safety devices monitor

operation

Water Flow Calculation

Procedure

Water Flow = Power

set

– T in)

Flow ≥ 0.45

Burner ON

Flow < 0.45

Burner OFF

Burner On

Solar Mode Operation

Burner Off

T in ≥ T

– 1ºC

< T set

Ionization Electrode

Flame is sensed through an ionization electrode, and detection is granted for ionization currents higher than 0.5 µA. The two ionization electrodes are spaced to allow flame detection on both sides of the burner.

5. Working Principle / Electric Measurements

Water Flow Detection and Solar Mode Operation

out

set

Operation Action

Standby

(Inputs signals must

be within expected

limits)

Hot Water Demand

(tap opening)

Flame on main burner

Hot Water Delivery

Electrical plug connected Input

Temperature sensors OK Input

Table 10 – Minimum Operation Conditions Signals

Spark to ignition

Result

Input Contact closed

Input

Output

Output 13 V DC

Input I > 0.5 µA

Input

Page 38

Page 39

[1] Ionization sensor

[13] Thermofuse

[25] Connection for Recirculation Pump

[2] Fan [3] Ignition electrode [4] Power supply [5] Connection for anti freeze kit [6] Connection for remote control [7] Gas valve - Modulation [8] Water bypass valve [9] Manifold solenoid 3 [10] Manifold solenoid 1 [11] Manifold solenoid 2 [12] Gas valve – Safety Solenoid

[14] Water flow sensor [15] Exhaust temperature sensor [16] Exhaust temperature sensor in heat exchanger [17] Water outlet bypass temperature sensor [18] Cabinet air temperature sensor [19] Heat Exchanger outlet temperature sensor [20] Water inlet temperature sensor [21] Water outlet temperature sensor [22] Water valve stepper [23] Cascading in/Out [24] Touch control display

Figure 32 – K Series Electric Wiring Diagram

Page 39

Page 40

[1] Ionization sensor

[13] Thermofuse

[25] Connection for Recirculation Pump

Figure 33 – L Series Electric Wiring Diagram

Page 40

Page 41

Component

Description

Measuring Wire

Colors

When replaced by a new spare part,

in PA (Actuator) menu of display.

When replaced by a new spare part,

in PA (Actuator) menu of display.

Multimeter for Resistance Measurement R (Ω)

Red-Blue GND

14 Water Flow Sensor

Yellow-Blue GND

(pulse frequency ~Hz)

Water Valve Stepper

8 Bypass Water Valve Red – Red 0 v to 24 V dc

Motor

Thermal Fuse

(actuation

temperature:

237ºF / 114ºC)

Black – Red

White cable – White cable

Value Remarks

5 VDC Control power

≈ 2.5 to 2.9 V

5 V dc

On: ≥ 0.45 gpm (1.7l/min)

Note: See Table 9 to check correspondence between water flow and frequency signal.

calibration is needed using MF parameter

calibration is needed using bP parameter

Circuit Open – Not Ok

(infinity – no continuity)

Circuit Closed – Ok

(0 Ohm – continuity)

Heat Exchanger

temperature NTC

Outlet water

temperature NTC

Inlet water

temperature NTC

Air Box

temperature NTC

10 kΩ NTC

220 kΩ NTC See corresponding values in Table 12.

Table 11 – Electric Values

See corresponding values in Table 13.

Page 41

Page 42

Operating

(ºC)

Operating

(ºF)

-10

1373

-5

1034

784.7

600

462.1

358.4

279.9

220

174

138.5

104

110.9

113

89.24

122

72.24

131

58.78

140

48.08

149

39.51

158

32.63

167

27.07

176

22.56

185

18.88

194

15.87

203

13.39

100

212

11.34

105

221

9.642

110

230

8.228

Temperature

Resistance

(KΩ)

Table 12 – NTC Resistance Values for Air Box NTC

Figure 34 – Diagram for Combustion NTC’s

Page 43

Operating

(ºC)

Operating

(ºF)

(KΩ)

30.34

30.4

36.47

23.674

25.902

28.129

18.617

20.247

21.878

14.749

15.95

17.151

11.768

12.657

13.547

9.454

10.115

10.777

7.644

8.138

8.632

6.218

6.589

6.959

104

5.089

5.367

5.646

113

4.188

4.398

4.608

122

3.466

3.624

3.782

131

2.883

3.002

3.122

140

2.41

2.5

2.59

149

2.009

2.092

2.175

158

1.683

1.759

1.835

167

1.416

1.486

1.555

176

1.197

1.26

1.323

185

1.016

1.074

1.131

194

0.866

0.918

0.97

203

0.741

0.788

0.836

100

212

0.637

0.68

0.722

105

221

0.549

0.588

0.627

110

230

0.475

0.51

0.545

Figure 34 – Diagram Water NTC

Temperature

R min

(KΩ)

nominal

R max

(KΩ)

Table 13 – NTC Resistance Values for Water Temperature NTC’s

Page 44

The following pictures show cable location in each connector on the PCB (printed circuit board):

Figure 35 – Sensor Connector with 22 pins

Figure 36 – Water Valve and Cascading System Connector with 12 pins

Page 45

Component

Description

Multimeter in position for

µA

~ 0 – 45 V

~ 10.8 – 13.2 V

Mechanically

valve (MV1)

Main safety solenoid valve (SSV)

~ 20.4 – 24 V DC (open) Resistance ~ 120 Ω

Solenoid valve (SV1)

~ 12 – 13 V DC Resistance ~ 105 Ω

Burner Manifold Segment 1

Solenoid valve (SV2)

~ 12 – 13 V DC Resistance ~ 105 Ω

Burner Manifold Segment 2

Solenoid valve (SV3)

~ 12 – 13 V DC Resistance ~ 125 Ω

Burner Manifold Segment 3

2 – Safety valve (SV1)

4 – Outlet gas

Ionization electrode White wire to ionization

Measuring Wire Colors Value Remarks

electrode

Brown-Blue GND

2 Combustion fan

Red-Blue GND

Yellow-Blue GND DC~V (pulse frequency ~ Hz) Feedback from hall sensor

modulated

Red-Black

Black-Black

Blue-Blue

Black-Black

White-White

Table 14 – Component Electrical Measurements and Values

1 - Gas inlet 3 – Modulation valve (MV1)

current measurement, with scale for µA range of values

Ionization current > 0.5

~ 4 – 12 V

Resistance ~ 80 Ω

Figure 37 – Gas Valve Solenoids

Note: Cables connected in series between ionization cable from control unit and electrode.

Supply power

Control power

Modulation Valve

Inlet Safety Valve

Page 45

Page 46

Figure 38 – Gas and Bypass Valve Connector with 14 pins

Figure 39 – Fan Connector with 8 pins

Figure 40 – Ignition Transformer

Page 47

Figure 41 – Inside View of the Control Unit

Figure 42 – Power supply and anti-freeze connector with 6 pins

Page 48

Mode

Parameter

Setting

P1 (Max Power)

P2 (Min Power)

6. After Sales Service

In order to ensure a correct start-up of the appliance and a correct function after any intervention on the appliance, the service manual must be read and main recommendations followed to avoid wrong diagnostic / components replacement and premature failures.

To ensure correct start-up of the appliance and correct function after any maintenance procedures, the service manual must be read and fully followed to avoid incorrect diagnostics and prevent incorrect component replacement or premature failure of components or the appliance.

6.1 PCB Replacement:

When replacing the control unit, configurations need to be checked and set accordingly. Not following precautions will result in potential wrong operation of the unit with abnormal combustion, noise and temperature instability.

Attention:

Control units are supplied as spare part with the following default values:

• NG = Natural Gas (setting visible in P7)

• Indoor Model (visible in PE – nO)

Recommended Procedures:

– Combustion Parameters Registration:

- Take note of P1 / P2 combustion adjustment values (settings memorized in factory

regulation);

– PCB replacement

- Switch off the electrical supply.

- Unscrew fixation screw of PCB.

- Disconnect the connectors in PCB.

- Reassemble all the connections.

Page 49

Question

Options

USA

Europe

160 kBTU 199 kBTU

Commercial

Figure 43 – Confirmation of HMI Configuration (gas type)

– Configuration of the New PCB

- Switch ON electrical supply.

- Follow configuration tips in HMI.

Region Selection

Appliance Power

Type

Residential

4th Combustion Parameters Configuration

- Confirm P7 = NG or change it to LPG in case of unit operating with Propane.

- Confirm nO (in PE) = Indoor or change it to Outdoor in case of outdoor unit.

- Insert manually the values taken from previous PCB (the default setting in A1 / L1 / A2 / L2 =

20).

Attention: Procedure to enter in Service Mode (only for outdoor units with inbuilt internal HMI):

From this position and using the selection buttons “+” and “-“, different service modes can be assessed.

Figure 44 – Service Mode Entry Procedure

Page 50

Maximum Power

P3 P4

Information

Gas Type

Set point

(not used)

See Combustion - gas

components

U1 U2

Table 15 – Service Mode Parameters List (1st level)

power adjustments section for more details

Minimum Power

Normal Mode

Connectivity

Start-up Delay

Units Set

Backlight control

Purge mode

Calibration of

Cascading mode

Auto Adjust L1

Auto Adjust L2

Page 50

Page 51

Combustion – Gas Power Adjustment Parameters

Technician Level

Comments

B) Gas Pressure

- P

burner

A) Fan Pressure

- P

air

C) Pressure Tee (Field Supplied)

The adjustment of the appliance for minimum (P2) / maximum (P1) power operation may be needed under the following conditions:

- Gas valve replacement – run the U1 and U2 to find L1 / L2 values according characteristic of new gas valve;

- Fan replacement – use flue gas analyzer as described in manual to find correct setting of A1 / A2 (air flow);

The following image indicates the 2 measurement points to be used:

Measurement Point

Measurable values:

Figure 46 – P1 / P2 deltaP Measurement Points

Measurement Point

Measurable values:

The P1 mode can be accessed in the service mode, depending on the adjustment and/or confirmation need.

Range of value in control unit is from

NOT USED

Spare part default setting is 20

Table 16 – P0

0 to 40

Page 51

Page 52

Maximum Power Adjustment

Technician Level

Comments

To keep the appliance in P1 (maximum power adjustment), it is important to assure a minimum water flow, otherwise the appliance will jump automatically to P2 (minimum power).

160 kBTU: > 3 GPM

199 kBTU: > 4 GPM

Table 17 – Minimum Water Flow Needed to Keep P1

Maximum power burner

adjustment after repairs /

maintenance / gas

conversions

P1 contains the fan speed setting

(A1) and gas power (L1) at

maximum power

(depends on gas type / model)

When P1 is visible, press “P” and enter in the 2nd level accessing

“E” for enter and/or exit P1

Adjustment of air flow

without change gas

conditions

Adjustment of gas flow

without change air

conditions

Range from 0 to 40

Spare part default setting is 20

Range from 0 to 40

Spare part default setting is 20

Table 18 – P1 Sub-Menus

Values in P1 mode are settled according to the appliance selection and gas type from factory. To check default value or to change parameter, press “Program” button when inside of P1.

Page 53

Minimum Power

(Minimum gas and water flow)

Remote control registration

Comments

The P2 mode can be accessed in the service mode, depending on adjustment and/or confirmation need.

adjustment

Technician Level Comments

Minimum power burner

adjustment after repairs /

maintenance / gas

conversions

When P2 is visible, press “P” and enter in the 2nd level accessing

“E” for enter and/or exit P1

Adjustment of air flow

without change gas

conditions

Adjustment of gas flow

without change air

conditions

P2 contains the fan speed setting

(A2) and gas power (L2) at

maximum power

(depends on gas type / model)

Range from 0 to 40

Spare part default setting is 20

Range from 0 to 40

Spare part default setting is 20

Table 19 – P2 Sub-Menus

Not used

Table 20 – P3

Page 54

The access to the data visualization mode, is made by entering first in the “service mode” and then,

Diagnostic mode and visualization mode

This mode helps the

This mode helps

Main recommendation

Sequence of

Parameters in P4

scrolling to the parameter “P4” of the adjustment mode.

Installer Level Technician Level Comments

installer in the

startup to check

parameters such as

water flow through

the appliance and

inlet / outlet

temperatures

Table 21 – P4

By pressing the “P” button while the display shows “P4”, the LCD will enter into visualization mode and will show “E”, meaning “Exit” from the visualization mode. By pressing “P” button again, the LCD will show “P4”, i.e. the visualization mode has been exited. After entering into data visualization mode (showing “E”) and then pressing “+” or “-” button, the

parameter and failure visualization fields can be selected as shown in Table 22.

Comment Value / Unit

Entry / Exit of visualization mode

the technician to

find some

information useful

to adjust and to

check functionality

of the appliance.

is to perform always a

check on the last 10

failures in memory in

order to analyze

eventual problems in

installation that might

need to be corrected

Possible change of set point

without leave service mode and

perform any needed control

Temperature indication

Inlet water temperature

Temperature indication

Hot water temperature

Water flow indication

l/min (±0.5l/min)

ºC or ºF

Temperature read by inlet sensor

ºC or ºF

Temperature read by outlet sensor

ºC or ºF

Indicates water flow measured by

the turbine (l/min or gal/min.)

Page 54

Page 55

Components Calibration

Technician Task

Comments

Not existing

Temperature of air in room

sealed box

until

Last 10 Failures for diagnostic

purposes

Table 22 – Visualization Mode Parameters

Temperature read by box sensor

ºC or ºF

Failure 1 is last failure occurred Failure 2 occurred before Failure1 Failure 3 occurred before Failure2 Failure 4 occurred before Failure3 Failure 5 occurred before Failure4 Failure 6 occurred before Failure5 Failure 7 occurred before Failure6 Failure 8 occurred before Failure7 Failure 9 occurred before Failure8

Failure 10 occurred before Failure9

The following parameter is only applicable when correspondent component is replaced in field.

Only applicable

when components

are replaced

Allows the technician to calibrate

components operation range after a

replacement

Entry / Exit

parameter

Open tap with flow of 5 to 6 l/min or 1.2 to

Calibration of

bypass

1.6 gal/min. The calibration will be done by itself while calibration of by-pass valve is

being done and successful calibration will

be confirmed on the display

Calibration of

motorized water

valve (stepper

motor)

Open hot water tap in any flow rate and

automatically the unit will close the water

flow and start opening slowly for calibration

Table 23 – PA Sub Menus

Page 56

This mode allows the installer to

Cascading Mode

Parameter

configurate the units to operate in

cascading (optional kit with cable

required)

Deactivation of cascading

mode

Selection as Master

Selection as Slave

Table 24 – PC

Press “P” for > 3 sec to define unit as

Master (only 1 unit in system)

Press “P” for > 3 sec to define / confirm

unit as slave

7. Maintenance

To ensure continued efficient operation of the appliance, checking and servicing the appliance at regular intervals is recommended. The frequency of servicing depends on the individual installation conditions and use profile, but in general, once a year should be adequate. Any maintenance work in the appliance must be carried out by a competent person such as a registered and competent technician. Before any service operation, turn off the gas supply at the main gas service valve upstream. Carry out the maintenance procedure as described in the manual.

The service partners have all necessary accessories and tools for maintenance tasks.

Page 57

L641 – O-rings in contact with water

HFt1 v5 – Gaskets in contact with gas

Figure 47 – Recommended Lubricants for Connections

Cleaning the Filter

For the cleaning of the filter, first loosen the nut (1), then remove the filter (2) that is fixed in the body of the inlet water valve. Clean the filter with water and / or air pressure. Assembly is reverse of disassembly.

Figure 48 – Water Filter Removal

Inspect and clean the heat exchanger when needed. To remove the heat exchanger, begin by turning off the cold-water supply to the unit. Open the taps to release any remaining water pressure and drain the appliance.

Page 58

Figure 49 – Heat Exchanger Cleaning

Heat Exchanger Fin Coils

Inspect the heat exchanger fin coils for soot build-up or blockage. If there is evidence of soot build-up or blockage, the heat exchanger should be removed by a professional and cleaned thoroughly. Soot is an indication of incomplete combustion and a clear sign of a serious problem. Venting, gas pressure, and flue gases should be examined to determine the cause of the problem. Damage to the water heater caused by incorrect installation or adjustment are not covered by the manufacturer's warranty

Take care not to damage the seals that ensure tightness between the heat exchanger, the heat cell, and collector and ensure correct clearing and alignment of the fins.

In hard water regions it may be necessary to descale the heat exchanger body, using a proper descaler. Fill the heat exchanger with the descaling solution and let it act until the solution stops bubbling. Drain and thoroughly wash out the exchanger with clean water.

Warning: Acid/water solutions must be used with extreme caution. Take care not to splash on to the skin or into the eyes. Wash any affected areas with large amounts of cold water and seek medical advice.

Figure 50 – Heat Exchanger Descaling

Page 59

Descaling Using a Pump

▶ Disconnect the electrical supply from the water heater. ▶ Shut off the water supply to the water heater. ▶ Open hot water taps to drain and relieve pressure from the plumbing system. ▶ Shut off hot water valve to the water heater. ▶ Connect a line (A) from the outlet of the circulating pump (installer supplied) to the inlet drain

connection on the water heater.

▶ Using another line (B), connect the outlet drain connection of the water heater. Route the other end

of this line into a descaling reservoir.

▶ Using a 3rd line (C) from the descaling reservoir, connect to the inlet side of the circulating pump.

Install a filter on the end of the line in the descaling reservoir.

▶ Make sure all connections are water tight. ▶ Fill the descaling reservoir with descaling solution so both lines inside are submersed. We

recommend a straight white vinegar solution. If using a commercial descalant, refer to the manufacturer's instructions for proper dilution ratio.

▶ Ensure both drain connections are open. ▶ Operate the circulating pump. ▶ Make sure there are no leaks and the solution is flowing from the descaling reservoir through the

heater and returning to the reservoir.

▶ Run the solution through the heater until the solution returning to the descaling reservoir comes out

clear. (Changing to a fresh solution may be necessary during this process).

▶ Disconnect all lines and drain all solution from heat exchanger. Properly discard the solution. ▶ Close the inlet drain connection. ▶ Position a container below the outlet drain connection and connect the cold-water supply. Open the

cold-water supply shutoff valve and flush the heat exchanger with clean water.

▶ Close the cold-water shutoff valve and reconnect hot water supply to the water heater. ▶ Close the outlet drain connection.

Re-assemble the heat exchanger ensuring its correct position on the two support hooks in the appliance back plate, good conditions of seals and tightness between heat exchanger, collector and burner.

Page 60

Figure 51 – Heat Exchanger

Replacement of Parts

Any service work must be carried out by a competent person such as the technician indicated by the after sales organization. Before any service operation, turn off the gas supply at the main gas service valve.

When replacing components, always use the supplied gaskets / sealings provided with the parts and / or always order the maintenance kit.

Page 61

Display

Description

Solution

Either cold or hot water temperature sensor fault

The appliance automatically regulates the performance of

concentric vent.

The appliance is protected against overheating.

limit.

External Tank temperature sensor is not

fault.

Check temperature sensor and associated connections.1) 2)

loading application is not in use

Flue gas temperature sensor fault.

Check connections or replace sensor.

Cabinet air temperature sensor fault.

Check connections or replace sensor.

Primary or Secondary heat exchanger gas temperature sensor fault.

Inlet water temperature sensor fault.

Check connections or replace sensor.

Heat exchanger temperature sensor fault.

Check connections or replace sensor.

Outlet water temperature sensor fault.

Check connections or replace sensor.

Incorrect output power. Hot water

LP).

▶ Perform calibration in submenu bP in PA

▶ Close and open a hot water tap.

Main Water valve disconnected

Check water valve connections

Barometric pressure sensor fault

Replace electronic control unit

8. Trouble Shooting

Temperature inside the cabinet is above 158 °F.

Flue gas temperatures above 356 °F after the primary heat exchange and/or 176 °F at the exhaust sensor.

installed properly. Temperature sensor

Check temperature sensors and associated connections.

the appliance to avoid overheating.

▶ External air temperature is above 140 °F. ▶ Check for flue leakage inside the appliance or in

▶ Descale appliance. 1) ▶ Check if inlet water temperature is above maximum

▶ Check SA-A1 menu in HMI and select OFF if tank

Check connections or replace sensor.

temperature sensor is not installed

C5 Fault in the bypass valve.

C7 Fan not working

properly. Incoming gas pressure too low (below 3.5" W.C. for NG or 8" W.C. for

▶ Check incoming gas pressure.1) ▶ Check hot water temperature sensor. ▶ Check manifold solenoids are operating

▶ Check bypass valve connections.

▶ Check fan connections.

Page 61

Page 62

Display

Description

Solution

Air in the water circuit (commissioning).

specified ( 9.24GPM).

- Vent blockage during operation (Flue

Excessive flue vent pressure.

Flow sensor does not detect water recirculation.

Check pump and connections. ▶ Check recirculation circuit for any blockage.

Internal Failure in ECU

Flow sensor does not detect water recirculation.

▶ Check sensor resistance.

Copper heat exchanger gas temperature

the appliance is locked.

To unlock, reset the appliance by touching the ON/OFF

▶ If the problem persists replace ECU.

Error during ionization test. ECU internal error.

Thermofuse open. Temperature above 237 °F.

▶ Check Air/Gas flow adjustment.

Partial ionization loss 5 times.

▶ Check the gas supply pressure.1)

Water flow above maximum value

vent outlet or air vent inlet). Insufficient combustion air.

- Air flow insufficient for start-up (Before flame ignition).

- Flue outlet vent blockage (exhaust pressure above siphon water column).

Hot water temperature sensor detects overheating (> 194 °F).

Flue gas temperature sensor detects high temperature (> 194 °F).

Temperature inside the cabinet is above 194 °F.

▶ Disconnect the appliance and purge hydraulic circuit.1) ▶ Check that water pressure does not exceed 150 psi.

▶ Remove blockage from the exhaust/intake vent.

▶ Check room air inlet requirements. See Chapter 4.7. ▶ Reset the appliance.

▶ Let the appliance cool down and try again.

▶ Let the appliance cool down and try again.1)

▶ Check for flue gas leakage inside the cabinet. ▶ Let the appliance cool down and try again.1)

E7 Internal error

sensor detects temperature above 392 °F,

Flame not detected. Ionization loss 9 consecutive times.

Descale appliance.

▶

button for 3 sec.

ECU may need to be replaced.

Replace thermofuse cable.

▶ Check the gas supply pressure. ▶ To unlock, reset the appliance by touching the ON/OFF

button for 3 sec.

▶ If the problem persists check the ignition electrode or

the ionization electrode.

Page 62

Page 63

Display

Description

Solution

the ionization electrode.

Modulating gas solenoid valve disconnected.

▶ Liquid propane gas appliance supplied with NG.

To unlock, reset the appliance by touching the ON/OFF

Check the electrodes and the cable.1)

Check connections.1)

button for 3 sec.

off valve electric circuit.

Buttons touched for more than 30s.

Release the button.

Check that gas supply is the same as appliance gas

Operation manual).

Check that gas supply is the same as appliance gas

manual). Decrease A1 or A2 air adjustment parameter.

▶ To unlock, reset the appliance by touching the ON/OFF

button for 3 sec.

▶ If the problem persists check the ignition electrode or

EF Wrong gas type.

F2 ECU internal error

F3 Memory failure

F7 A flame is detected before gas valve open.

F9 Safety gas solenoid valve disconnected.

Fault in the main gas shut-off valve or gas manifold shut-off valve.

▶ Check valve connection.

▶ Natural gas appliance supplied with liquid propane gas.

▶ To unlock, reset the appliance by touching the ON/OFF

button for 3 sec.

▶ If the problem persists replace ECU.

▶

button for 3 sec.

▶ If the problem persists replace ECU.

▶ ▶ To unlock, reset the appliance by touching the ON/OFF

button for 3 sec.

▶ If the problem persists replace ECU.

▶ ▶ To unlock, reset the appliance by touching the ON/OFF

▶ Main gas shut-off valve or gas manifold shut-off valve

stuck/locked.

▶ Check main gas shut-off valve and gas manifold shut-

High Pitch

Noise

Low Pitch Noise with Vibration

Combustion flame with gas in excess or lack of air (combustion adjustment is rich).

Combustion flame with air in excess or lack of gas (combustion adjustment is lean).

▶

type (NG or LP).

▶ Check appliance CO2 adjustment (excessive CO2, see

table 19 or 20 located inside your Installation and

▶

type (NG or LP).

▶ Check gas pressure supply (gas pressure too low). ▶ Check appliance CO2 adjustment (low CO2, see table

19 or 20 located inside your Installation and Operation

Page 63

Page 64

www.bradfordwhite.com

General Contact

800-523-2931

General Contact

866-690-0961

For field service, please contact your professional installer or

United States

Canada

International

General Contact

[email protected]

Technical Support

Warranty

Service Parts

Technical Support

Warranty

Orders

800-334-3393

800-531-2111

800-538-2020

800-334-3393

800-531-2111

Orders

local Bradford White sales representative.

[email protected]