Lochinvar SYNC 1 User Manual

SYNC-SER Rev G

Service Manual

Models: 1.0, 1.3, and 1.5

 WARNING

Save this manual for future reference.

This manual must only be used by a qualified heating installer / service technician. Read all instructions, including this manual and the SYNC Installation and Operation Manual, before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

Contents

CONTENTS ........................................................................ 2

Hazard Definitions .............................................................. 2

PLEASE READ BEFORE PROCEEDING ......................... 2

Handling Ceramic Fiber Materials ...................................... 3

When servicing boiler ................................................... 3

Boiler operation ............................................................ 3

Boiler water ................................................................... 3

Freeze protection fluids ................................................ 3

WHAT IS IN THIS MANUAL .............................................. 4

1. SERVICE

Near Boiler Piping .............................................................. 5

The SYNC Boiler Display ................................................... 6

Control Inputs ............................................................... 7

Control Outputs ............................................................. 8

General Operation ........................................................ 9

Sequence of Operation .................................................... 10

Parameter Table.......................................................... 11-12

Viewable and Changeable Control Parameters .......... 13-35

2. MAINTENANCE

Maintenance and Annual Startup ................................ 36-41

3. TROUBLESHOOTING

Alarm Screen.................................................................... 42

Before Troubleshooting .................................................... 43

Check Control Module Fuses .......................................... 43

Table 3A - Troubleshooting Chart - No Display ......... 44

Checking Temperature Sensors ...................................... 45

Table 3E - Troubleshooting Chart - Noisy System ..... 46

Table 3F - Troubleshooting Chart - Fault Messages 47-53

Combustion Analysis Procedure ...................................... 54

Table 3G - Troubleshooting Chart - Combustion Levels 54

Table 3H - Flue Products ........................................... 54

Gas Valve Adjustment Procedure .................................... 55

Revision Notes .................................................. Back Cover

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

 DANGER

 WARNING

 CAUTION

CAUTION

NOTICE

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

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

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.

Please read before proceeding

 WARNING

Installer – Read all instructions, including this manual and the SYNC Installation and Operation Manual, before installing. Perform steps in the order given.

User – This manual is for use only by a qualified heating installer/service technician. Refer to the SYNC User’s Information Manual for your reference.

Have this boiler serviced/inspected by a qualified service technician at least annually.

NOTICE

When calling or writing about the boiler – Please have the boiler model and serial number from the boiler rating plate.

Consider piping and installation when determining boiler location (see the SYNC Installation and Operation Manual).

Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee.

Failure to comply with the above could result in severe personal injury, death or substantial property damage.

2

Handling ceramic fiber materials

REMOVAL OF COMBUSTION CHAMBER LINING

 WARNING

The combustion chamber insulation in this appliance contains ceramic fiber material. Ceramic fibers can be converted to cristobalite in very high temperature applications. The International Agency for Research on Cancer (IARC) has concluded, “Crystalline silica in the form of quartz or cristobalite from occupational sources is carcinogenic to humans (Group 1).” Normal operating temperatures in this appliance are below the level to convert ceramic fibers to cristobalite. Abnormal operating conditions would have to be created to convert the ceramic fibers in this appliance to cristobalite.

The ceramic fiber material used in this appliance is an irritant; when handling or replacing the ceramic materials it is advisable that the installer follow these safety guidelines.

Avoid breathing dust and contact with skin and eyes.

• Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for cristobalite at the time this document was written. Other types of respirators may be needed depending on the job site conditions. Current NIOSH recommendations can be found on the NIOSH website at http://www.cdc.gov/niosh/homepage.html. NIOSH approved respirators, manufacturers, and phone numbers are also listed on this website.

• Wear long-sleeved, loose fitting clothing, gloves, and eye protection.

Apply enough water to the combustion chamber lining to prevent airborne dust.

 Remove the combustion chamber lining from the appliance and place it in a plastic bag for disposal.

 Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer

thoroughly.

Service Manual

NIOSH stated First Aid.

 Eye: Irrigate immediately.  Breathing: Fresh air.

When servicing boiler –

• To avoid electric shock, disconnect electrical supply before performing maintenance.

• To avoid severe burns, allow boiler to cool before performing maintenance.

Boiler operation –

• Do not block flow of combustion or ventilation air to the boiler.

• Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance.

• Do not use this boiler if any part has been under water. The possible damage to a flooded appliance can be extensive and present numerous safety hazards. Any appliance that has been under water must be replaced.

Boiler water –

• Thoroughly flush the system (without boiler connected) to remove sediment. The high-efficiency heat exchanger can be damaged by build-up or corrosion due to sediment.

• Do not use petroleum-based cleaning or sealing compounds in the boiler system. Gaskets and seals in the system may be damaged. This can result in substantial property damage.

• Do not use “homemade cures” or “boiler patent medicines”. Serious damage to the boiler, personnel, and/or property may result.

• Continual fresh make-up water will reduce boiler life. Mineral buildup in the heat exchanger reduces heat transfer, overheats the stainless steel heat exchanger, and causes failure. Addition of oxygen carried in by makeup water can cause internal corrosion. Leaks in boiler piping must be repaired at once to prevent the introduction of makeup water.

Freeze protection fluids –

• NEVER use automotive antifreeze. Use only inhibited propylene glycol solutions which are specifically formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.

3

What is in this manual?

Service Manual

Service

Near boiler piping

• Typical system components

The SMART TOUCH display

• Touch screen readout, buttons and their functions

Control module inputs

• Control module inputs and options

Control module outputs

• Control module outputs and options

General

• How the boiler operates

• How the control module operates

• Access modes -- user and installer

• Sequence of operation -- Hot Water Generation (HW)/space heating

Control panel menu access

• Accessing programming mode and locating menus (See separate guides covering the PC interface.)

Maintenance

• Service and maintenance schedules

• Address reported problems

• Inspect boiler area and boiler interior

• Clean condensate trap

• Check all piping for leaks

• Check air openings

• Flue vent system and air piping

• Check water system

• Check expansion tank

• Check boiler relief valve

• Inspect ignition electrode

• Check ignition ground wiring

• Check all boiler wiring

• Check control settings

• Perform start-up and checks

• Check burner flame

• Check flame signal

• Check flue gas temperature

• General maintenance

• Review with owner

• Cleaning boiler heat exchanger

• Oiled bearing circulators

Troubleshooting

Control panel parameter access

• Accessing and changing parameters from the touch screen

Quick start information -- parameter table

• An index of available adjustments and readouts, where to access them and where to find detailed information.

SYNC operation

• Service / Setup

• Set Points

• Outdoor Reset

• Night Setback

• Cascade

• Pumps

• BMS

• Troubleshooting table - No display

• Checking temperature sensors

• Sensor tables

• Troubleshooting table - Fault messages displayed on boiler interface

• Combustion analysis procedure

• Gas valve adjustment procedure

4

R

Service Manual

1 Service

Near boiler piping

This piping reference is included to specify the Near Boiler Piping specific to the SYNC. This piping scheme is important for proper operation of the SMART TOUCH control module. See the SYNC Installation and Operation Manual for more detailed piping diagrams.

DRAIN (TYPICAL)

SYSTEM SUPPLY SENSOR (NOTICE: A SYSTEM SUPPLY SENSOR MUST BE INSTALLED FO PROPER BOILER OPERATION.)

SYSTEM PUMP

ISOLATION VALVE

(TYPICAL)

Y-STRAINER

(RECOMMENDED)

(TYPICAL)

HEAT EXCHANGER 1

BOILER PUMP

HEAT EXCHANGER 2

BOILER PUMP

CHECK VALVE

(TYPICAL)

TEMPERATURE GAUGE

RELIEF VALVE

TO FLOOR DRAIN

5

1 Service

The SYNC display

Service Manual

6

1 Service (continued)

Control inputs

LOW VOLTAGE

CONNECTION

BOARD

SEQUENCER / BUILDING

MANAGMENT SYSTEM

Service Manual

SECONDARY

SMART CONTROL

MODULE

PRIMARY

SMART CONTROL

MODULE

OUTDOOR SENSOR

HW TANK SENSOR

SYSTEM SENSOR

FLOW SWITCH

HW THERMOSTAT

ROOM THERMOSTAT /

ZONE CONTROL

HEAT EXCHANGER SWITCH

BLOCKED DRAIN SWITCH

LOW WATER CUTOFF

TOUCH PANEL

TOUCH DISPLAY

PC INTERFACE

INTERFACE

O-TEMP

MODBUS COMMUNICATION

BOARD

O-TEMP HEAT EXCHANGER SWITCH

PRIMARY/SECONDARY INLET

TEMPERATURE SENSOR

PRIMARY/SECONDARY OUTLET

TEMPERATURE SENSOR

PRIMARY/SECONDARY

FLUE GAS SENSOR

PRIMARY/SECONDARY

GAS PRESSURE SWITCH

PRIMARY/SECONDARY

HIGH LIMIT SENSOR

PRIMARY/SECONDARY

FLAME SENSOR

IMG00004

7

1 Service

Control outputs

Service Manual

SECONDARY

LOW VOLTAGE

CONNECTION

BOARD

ALARM BELL

RUN TIME CONTACTS

SMART TOUCH

CONTROL MODULE

PRIMARY

SMART TOUCH

CONTROL MODULE

SEQUENCER / BUILDING

MANAGEMENT SYSTEM

SYSTEM PUMP

TOUCH DISPLAY

PC INTERFACE

TOUCH PANEL

INTERFACE

HEAT EXCHANGER 1 / HEAT EXCHANGER 2 BOILER PUMP

HW PUMP

IGNITOR

BLOWER

GAS VALVE

8

1 Service (continued)

General Operation

Service Manual

How the boiler operates

The SYNC uses two (2) advanced stainless steel heat exchangers and two (2) electronic control modules that allow fully condensing operation. The blowers pull in gas and air and push flue products out of the boiler through the heat exchangers and flue piping. The control modules regulate blower speeds to control total boiler firing rate. The gas valves sense the amount of air flowing into the boiler and allow only the right amount of gas to flow.

How the control module operates

The SYNC control modules receive input from boiler sensors. The control modules activate and control the blower and gas valves to regulate heat input and switches boiler, Hot Water Generation (HW) and system pumps on and off as needed. The user/installer programs the control module to meet system needs by adjusting control parameters. These parameters set operating temperatures and boiler operating modes.

Sequence of operation

Access modes

User

The user can view all of the settings on the LCD screen. By entering the user password (0704), the user can adjust the User Set Point, Outdoor Shutdown, Night Setback, Boost, HW Boiler Output Set Point, Backlight Time, and Backlight Brightness settings.

Installer

Most parameters are available only to the installer, accessible only by entering the installer access code (5309).

Table 1A shows control module normal sequences of operation for space heating and HW operation for each individual control module. Additionally, the control modules are programmed to synchronize their combined modulation rates in order to maximize total boiler efficiency. The combined operation sequence is for a typical application, programmed to provide HW priority.

9

Service Manual

1 Service

Sequence of operation

Table 1A Sequence of operation - space heating and HW

Note: This unit is equipped with two (2) independent, but synchronized combustion systems. Heat Exchanger 1 (top) combustion system will fire first. If the demand cannot be met by one (1) combustion system the same sequence of operation will be followed to bring the Heat Exchanger 2 combustion system online.

Upon a call for heat, the control turns on the appropriate pumps (system and boiler pumps for a space heating call,

1.

HW pump relay output for a HW call).

The control confirms that the low water cutoff and flow switch (optional) contacts are closed.

2.

The control starts the blower and closes the louver contacts to begin the Pre-Purge cycle.

3.

The control confirms that the blower comes up to the desired speed, the flap valve opens, and the air pressure switch,

4.

gas pressure switches, louver proving switch (field installed), and blocked drain switch contacts close.

Once the Pre-Purge cycle is complete, the control lowers the blower speed, initiates sparking of the ignition electrode,

5.

and opens the gas valve.

6.

7.

8.

9.

10.

11.

12.

After a short wait, the control stops sparking and checks for the presence of flame current through the spark and flame sense electrodes.

If the control does not detect flame current, the control will lockout, until the RESET button on the touch screen LCD is pressed.

If the control detects flame current, the control will hold the blower speed constant for a few seconds to allow the flame to stabilize, then begin modulating the firing rate in order to maintain the controlling sensor to the desired set point temperature.

If the current call for heat is for space heating and a HW call for heat becomes active, the control will turn on the HW pump relay output, then turn off the boiler pumps. It will then modulate the blower speed in order to maintain the outlet temperature to the desired HW outlet set point temperature.

If the first heat exchanger in the boiler is unable to maintain the desired set point temperature, the second heat exchanger in the boiler will be started, using much of the same sequences as described above. Once both heat exchangers are firing, the controls will work in synchronization to maintain the desired set point temperature. If the heat load should decrease sufficiently, the second heat exchanger will be shut down, much like the sequences described below.

Once both the space heating and HW calls for heat are satisfied, the control will turn off the gas valve and begin the Post-Purge cycle. Any pumps that are running will begin their respective Pump Delay cycles.

At the end of the Post-Purge cycle, the louver contacts will open.

13.

14.

10

The control verifies that the blower stops running and the flap valve closes.

At the end of the Pump Delay cycle(s), the pumps will be turned off.

Service Manual

1 Service (continued)

Parameter table

Table 1B This table lists the parameters and where to access them

MENU DESCRIPTION

Service/Setup 18 Yes Yes Yes Yes Night Setback 18 Yes Yes Yes Yes Set points 18 Yes Yes Yes Yes

SETUP

Cascade 18 Yes Yes Yes Yes Outdoor Reset 18 Yes Yes Yes Yes Pumps 18 Yes Yes Yes Yes BMS 18 Yes Yes Yes Yes

Demand Conf 19 Yes No Yes No Serv Not Time 19 No No Yes Yes Serv Not Run H 19 No No Yes Yes Serv Not Cycl 19 No No Yes Yes Ramp Delay 19 No No Yes Yes Max Serv T 20 Yes No Yes No

Temp Unit 20 No No Yes Yes

PARAMETERS

SERVICE / SETUP

User Passwd 20 No No Yes Yes

SEE

PAGE

USER ACCESS INSTALLER ACCESS

DISPLAY MODIFY DISPLAY MODIFY

LCD Backlight 20 No No Yes Yes

LCD Bright 20 No No Yes Yes

User setp 21 No No Yes Yes SH off df 21 No No Yes Yes

SH off/on df 21 No No Yes Yes

Tank setp 21 No No Yes Yes

Tank off/on df 21 No No Yes Yes

Indirect HW setp 21 No No Yes Yes

SH/HW sw tim 21 No No Yes Yes

NSB setp 21 No No Yes Yes

Min User setp 21 No No Yes Yes

SET POINT PARAMETERS

Max User setp 21 No No Yes Yes

Drop in Inlet Anti-C t 21 No No Yes Yes

21 No No Yes Yes

11

Service Manual

1 Service

Table 1B (continued from previous page) This table lists the parameters and where to access them

MENU DESCRIPTION

Reset T Lo Out 22 Yes No Yes No Reset T Hi Out 22 Yes Yes Yes Yes Out T Hi Reset 22 No No Yes Yes

Out T Lo Reset 22 No No Yes Yes

Out SD setp 22 No No Yes Yes

OUTDOOR RESET

NIGHT

Out SD df 22 No No Yes Yes

Boost tim 22 No No Yes Yes

Boost incr 23 No No Yes Yes

Date and time 24 Yes Yes Yes Yes On Timer and Off Timer 24 No No Yes Yes

SETBACK

Casc Address 25 Yes Yes Yes Yes Casc off df 25 No No Yes Yes Casc off/on df 25 No No Yes Yes

CASCADE

Max Outl temp 25 No No Yes Yes

SEE

PAGE

USER ACCESS INSTALLER ACCESS

DISPLAY MODIFY DISPLAY MODIFY

PUMPS

BMS

Boiler Pump D 26 Yes Yes Yes Yes HW Pump D 26 No No Yes Yes Sys Pump D 26 No No Yes Yes Sys Pump mode 26 No No Yes Yes

BMS Type 27 No No Yes Yes

BMS Setp min V 27 No No Yes Yes

BMS Setp max V 27 No No Yes Yes

BMS V min Setp 27 No No Yes Yes

BMS V max Setp 27 No No Yes Yes

BMS V Heat 27 No No Yes Yes

Dropin BMS End 27 No No Yes Yes

BMS mod@minV 28 No No Yes Yes

BMS mod@maxV 28 No No Yes Yes

BMS V @min mod 28 No No Yes Yes

BMS V @max mod

28 No No Yes Yes

12

Service Manual

1 Service (continued)

Viewable and changeable control parameters

Status Screen:

When the ON/OFF switch is turned to the ON position, the first screen visible on the LCD display will be the Status Screen. This screen displays the current status of the SYNC boiler. The following items can be viewed or interacted with on the Status Screen:

On/Off button - Pressing this button allows the boiler to be placed in either Manual Shutdown Mode or Standby Mode.

Boiler Status - This line shows the current operating status of the SYNC boiler. Displayed items are as follows:

• Manual Shutdown - The boiler will not respond to either a system call or a hot water generation call.

• Standby - The boiler has not received a system call or hot water generation call.

• SH Call for Heat - The boiler has received a system heat call.

• SH Pump Delay - The boiler has satisfied a system heat call and the boiler pumps are running for a fixed time to remove any residual heat.

• HW Storage - The boiler has received a hot water generation call.

• HW Pump Delay - The boiler has satisfied a hot water generation call and the hot water generator pumps are running for a fixed time to remove any residual heat.

• SH BMS - The boiler has received a call for heat from a 0-10 VDC BMS control.

• Service Set Point Met - While in Service Mode, the water temperature at either the outlet sensor or the system sensor has exceeded 185°F.

• HW Outlet Set Point Met - The outlet water temperature has exceeded the HW Generator Set Point parameter.

• OA Shutdown - The outside air temperature has exceeded the Outdoor Shutdown Set Point parameter.

• SH Set Point Met - The water temperature as measured by the system supply sensor has exceeded the User Set Point parameter or if the optional Outdoor Air Sensor was used, the calculated set point based on the Outdoor Reset parameters.

• Anti-Cycle Delay - The boiler has satisfied a system heat call, but has received another system heat call before the anti-cycling time parameter has elapsed.

• Cascade ComError - A communication error has occurred between the Control Module 1 and Control Module 2 or between the Leader and Member boilers.

13

1 Service

Service Manual

Boiler Configuration - This line shows the current configuration of the two control modules inside the unit.

Outlet Water Temperature - This is a calculated temperature based on the readings of the outlet temperatures of the two (2) heat exchangers.

System Water Temperature - This is the water temperature as measured by the system supply sensor located in the downstream piping.

Inlet Water Temperature - This is a calculated temperature based on the inlet temperature readings from the two (2) heat exchangers.

Hot Water Tank Temperature - This is the temperature as measured by the tank sensor in the hot water storage tank.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the Night Setback parameters on page 24 for information regarding adjusting the date and time.

Details button - Pressing this button brings up the Details Screen. This screen shows the status of the various safeties, inputs, and outputs to each control module. Reference the Details Screen section on page 15 for more information regarding this screen.

Main button - Pressing this button brings up the Main Screen. From this screen navigation to eight (8) other screens is possible. Reference the Main Screen section on page 17 of this manual for more information regarding this screen.

14

1 Service (continued)

Details Screen:

Service Manual

The Details Screen is accessed by pressing the DETAIL button on the Status Screen. This screen shows the status of the various safeties, inputs and outputs to each control module. Selection of the control module to be viewed is accomplished by pressing the SELECT button. The control module being displayed is shown in the module box.

Displayed items are as follows:

• SH Enable - Is ON when a system heat call has been received from a remote end switch or enabling device. Is OFF when a system heat call is not present.

• Manual Reset High Limit - Is ON when the manual reset high limit is closed. Is OFF when the manual reset high limit is open.

• SH Pump - Is ON when a system heat call has been received and the boiler pump is energized. Is OFF when the boiler pump is de-energized.

• HW Thermostat - Is ON when a Hot Water Generation call has been received from a tank thermostat. Is OFF when a Hot Water Generation call has not been received from a tank thermostat.

• Air Pressure Switch - Is ON when the combustion air blower is energized and the flap valve switch is closed. Is OFF when the flap valve switch is open.

• Gas Valve - Is ON when the gas valve is energized. Is OFF when the gas valve is de-energized.

• Gas Pressure Switches - Is ON when the high and low gas pressure switches are closed. If OFF when either the high or low gas pressure switches are open.

• Flow Switch / Low Water Cutoff - Is ON when the low water cutoff contacts are closed or if an optional flow switch is used and it is closed as well. Is OFF when the low water cutoff contacts are open or if an optional flow switch is open.

• Alarm - Is ON when a fault has been detected and the alarm contacts are closed. Is OFF when the alarm contacts are open.

• Louver Proving Switch - Is ON when a remote proving safety switch is closed. Is OFF when a remote proving safety switch is open.

• Blocked Drain Switch - Is ON when the blocked drain switch on the condensate trap is closed. Is OFF when the blocked drain switch on the condensate trap is open.

• Blower Power - Is ON when the combustion air blower is energized. Is OFF when the combustion air blower is de energized.

• System Pump - Is ON when a system heat call has been received and the system pump has been energized. Is OFF when the system pump is de-energized.

• Auto Reset High Limit - An auto reset high limit is not used in the standard configuration of the SYNC boiler. If OFF is shown then a wiring problem exists.

• Run Time Contacts - Is ON when the burner is energized. Is OFF when the burner is de-energized.

• HW Pump - Is ON when a Hot Water Generation call has been received from a tank thermostat or a tank sensor and the hot water generation pump is energized. Is OFF when the hot water generation pump is de-energized.

• 0-10Vdc - Shows the voltage signal being delivered from a remote Building Management System (BMS).

15

1 Service

Service Manual

A blank message box is located on the Details Screen. This box will display various messages detailing the status of the control module. If a message is present in this box, the DETAILS button on the Status Screen will contain a yellow triangle with an exclamation mark (!) inside.

Displayed items are as follows:

• Delta T Shutdown - The temperature rise between the inlet and outlet temperatures has exceeded 55°F. Reference page 53 for more information regarding this shutdown.

• Outlet Temp Shutdown - The outlet temperature has exceeded 195°F. Reference page 53 for more information regarding this shutdown.

• Flue Temp Shutdown - The flue temperature has exceeded 240°F. Reference page 53 for more information regarding this shutdown.

• Voltage too Low - The 120 VAC input to the control has dropped below 80 VAC. Reference page 52 for more information regarding this fault message.

• Connect System Sensor - System sensor is not detected by Control Module 1. For proper operation of the SYNC boiler the system sensor must be connected.

• Manual Shutdown - The boiler has been shutdown with the ON/OFF button on the Status Screen.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. This screen shows the current status of the SYNC boiler. Reference pages 13 - 14 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) additional screens is possible. Refer to Main Screen on page 17 for more information regarding this screen.

16

1 Service (continued)

Main Screen:

Service Manual

The Main Screen allows navigation to eight (8) additional screens which are used to set temperatures, operating conditions, and monitor boiler operation. These screens are as follows:

• Setup - Allows access to seven (7) other screens for the adjustment of the control parameters.

• Cascade - Shows the status of multiple boilers connected together in a cascade arrangement.

• Temps - Shows the temperatures measured by the individual sensors connected to the boiler.

• Burners - Shows the status of the two (2) independent burner systems used in the boiler.

• Building - Shows the information from a Building Integration System using Modbus Protocols.

• Graphs - Allows the selection of items to be graphed on a chart.

• History - Shows the operating and fault history of the two (2) control modules.

• Service Mode - Allows the installer to control the fan speed of the individual control modules for the purposes of combustion analysis. Service Mode will override all other heat demands, however, all safeties will remain intact.

Navigation to the Main Screen can be accomplished by pressing the MAIN button at the bottom of the page.

Reference pages 18 - 35 of this manual for more information regarding the eight (8) accessible screens.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. This screen shows the current status of the SYNC boiler. Reference pages 13 - 14 for more information regarding this screen.

17

1 Service

Service Manual

CAUTION

Before changing parameters, note the settings so that the unit can be returned to its original operating parameters.

Setup Screen:

The Setup Screen allows access to seven (7) other screens for adjusting control parameters.

These screens are as follows:

• Service / Setup - Allows access to change service notification parameters, LCD backlight parameters, and temperature units.

• Night Setback - Allows access to change the date and time and ON/OFF times for night setback.

• Setpoints - Allows access to change the system heat set point, hot water generation set point, and ON/OFF differentials.

• Cascade - Allows access to change the cascade parameters.

• Outdoor Reset - Allows access to change the reset curve parameters.

• Pumps - Allows access to change pump delay timing.

• BMS - Allows access to change the 0 - 10Vdc BMS parameters.

To change a parameter, press one of the seven screen buttons. A list of parameters and their corresponding location are located on pages 11 and 12, Table 1B. Once a Screen button is pressed a list of adjustable parameters will appear.

Select the parameter to be adjusted by pressing the SELECT button next to the parameter. The first time the parameters are accessed, you will be required to enter the service password. The service password is 5309. Using the keypad, enter the password and then press the OK button. If the password is not entered correctly, the screen will revert to the Parameter List Screen and you will not be able to adjust the parameters. If a digit has been entered incorrectly, press the left arrow key on the keypad to back the digit up.

18

If the password has been entered correctly, the Parameter Change Screen will appear. The Parameter Change Screen will display the parameter being changed, the previous setting of the parameter, and adjustment buttons.

To adjust the parameter, press the + or - buttons to change the value being displayed. Once the parameter has been adjusted to the desired setting, press the APPLY button to change the parameter and return to the Parameter List Screen. If no further changes are necessary, press the BACK button to return to the Parameter List Screen. Once all the necessary adjustments have been made, press the BACK button to return to the Setup Screen. Repeat this procedure to adjust the parameters in other screens.

Press the SAVE button to program all changes made to the control parameters and return to the Status Screen. Leaving the Setup Screen without pressing the SAVE button will erase the changes made to the control parameters and revert them back to their previous settings.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Main button - Pressing this button brings up the Main Screen. From this screen navigation to eight (8) other screens is possible. Reference the Main Screen section on page 17 of this manual for more information regarding this screen.

Save button - Pressing this button will save all changes made to the control parameters.

Status button - Pressing this button displays the Status Screen. This screen shows the current status of the SYNC boiler. Reference pages 13 - 14 for more information regarding this screen.

1 Service (continued)

Service/Setup Parameters Screen:

Service Manual

The Service / Setup Screen allows access to 10 parameters. Those parameters are as follows:

• Demand Configuration - Sets the configuration of the control modules inside the boiler. The configuration selections are:

Demand Configuration 1: Cascade Set Point Thermostat based - the control modulates the boiler based on the user set point and the temperature of the controlling sensor. An enable signal from a remote end switch or enabling device must be present to initiate a system heat call.

Demand Configuration 4: Cascade Set Point Modbus Thermostat based - the control modulates the boiler based on the user set point and the temperature of the controlling sensor. An enable signal is provided by writing to the holding registers on the Modbus communication board.

Demand Configuration 2: Cascade BMS Thermostat based - a 0 - 10Vdc signal is provided to the boiler to control either the set point or the modulation of the boiler. An enable signal from a remote end switch or enabling device must be present to initiate a system heat call.

Demand Configuration 5: Cascade Modbus BMS Thermostat based - a 0 - 10V dc signal is provided to the boiler to control either the set point or the modulation of the boiler. An enable signal and an equivalent 0 - 10V signal is provided by writing to the holding registers on the Modbus communication board.

Demand Configuration 3: Cascade BMS Voltage based - a 0 - 10Vdc signal is provided to the boiler to control either set point or modulation. A minimum voltage signal is required to initiate a system heat call.

Demand Configuration 6: Cascade Modbus BMS Voltage based - a 0 - 10V dc signal is provided to the boiler to control either set point or modulation. An equivalent 0 10V dc signal is provided by writing to the holding registers on the Modbus communication board.

If either BMS configuration is selected, additional parameters for BMS operation will have to be adjusted. Reference the BMS parameters on pages 27 and 28 for information regarding adjusting these parameters. There are three (3) other configuration selections that are possible, however, they must NOT be used on the SYNC boiler.

This parameter can only be changed by the installer. The default configuration is Cascade Set Point Thermostat based.

• Service Notification Time - When the boiler determines that a scheduled service is due based on days of installation, the Service Needed screen will appear. This parameter can only be changed by the installer. The adjustment range for this parameter is 0 months to 36 months. The default time is 12 months.

• Service Notification Running Hours - When the boiler determines that a scheduled service is due based on the hours of actual operation. This parameter can only be changed by the installer. The adjustment range for this parameter is 0 hours to 100,000 hours. The default time is 10,000 hours.

• Service Notification Cycles - When the boiler determines that a scheduled service is due based on the number of boiler cycles, the Service Needed screen will appear. This parameter can only be changed by the installer. The range for this parameter is 0 cycles to 100,000 cycles. The default is 10,000 cycles.

• Ramp Delay - Sets the mode of operation of the ramp delay. The selections are:

0. Off - Ramp delay disabled.

1. Step Up - The total output of the boiler or cascade will be limited after the call for heat begins.

2. Step Up / Down - The initial limitation will be determined by how long the boiler or cascade has been off. This parameter can only be changed by the installer. The default value is 0 - Off.

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Service Manual

• Maximum Service Time - Service Mode allows the installer to control the fan speed of the individual control modules for the purposes of combustion analysis.

Service Mode will override all other heat demands, however, all safeties will remain intact. Maximum service time sets the length of time the boiler will stay in Service Mode if no buttons are pressed before reverting back to its original state. This parameter can only be changed by the installer. The time range of this parameter is 0 to 40 minutes. The default value is 20 minutes.

• Temperature Units - The control can be configured to display temperatures in either °C or °F. The default is °F.

• User Password - Allows the user to access and change a limited number of control parameters. The access code can be changed by the user or the installer to a code of their choosing. The default code is 0704.

• LCD Backlight - Sets the length of time the LCD Screen will stay on after a button has been pressed. This parameter can be changed by the user or the installer. The time range for this parameter is 30 seconds to ON. With a setting of ON, the LCD Screen will be on continuously. The default time is 15 minutes.

Reference page 18 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

• LCD Brightness - Controls the brightness of the screen. This parameter can be changed by the user or the installer. The range for this parameter is 10% to 100%. The default percentage is 50%.

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1 Service (continued)

Set Point Parameters Screen:

Service Manual

The Set Point Screen allows access to 12 parameters. Those parameters are as follows:

• User Set Point - Sets the water temperature set point for fixed temperature operation or the maximum temperature set point when the outdoor air sensor is used. This parameter can be changed by the user or the installer. The temperature range of this parameter is 50° to 190°F. The default value is 125°F.

• Hot Water Tank Set Point - When a tank sensor is installed in a hot water storage tank, the hot water tank set point sets the target temperature of the water in the tank. This parameter can be changed by the user or the installer. The temperature range of this parameter is 60° to 185°F. The default value is 125°F.

• Hot Water Tank Differential - Sets how many degrees below the Hot Water Tank Set Point the hot water tank temperature must drop before the boiler will turn on. This parameter can only be changed by the installer. The temperature range for this parameter is 0° to 100°F. The default value is 5°F.

• Indirect HW Set Point - When a Hot Water Generation call for heat becomes active, the control will use the Indirect HW set point to determine the firing rate of the boiler based on the actual boiler outlet water temperature. This parameter can be changed by the user or the installer. The temperature range of this parameter is 50° to 190°F. The default value is 180°F.

• Night Setback Set Point - Once the internal clock has been set correctly, the night setback feature can be used to program a lower water temperature set point for space heating. This parameter can be changed by the user or the installer. The temperature range for this parameter is 32° to 140°F. This feature is turned off with a setting of 32°F. The default value is 32°F.

• Minimum User Set Point - Sets the minimum water temperature set point that can be used for space heating operation.

The user or installer may not go below this value when programming the “User Set Point”. The temperature range of this parameter is 0° to 190°F. The default value is 60°F.

• Maximum User Set Point - Sets the maximum water temperature set point that can be used for space heating. The user or installer may not go above this value when programming the “User Set Point”. The temperature range of this parameter is 0° to 190°F. The default value is 190°F.

• Drop in Inlet Temperature for Ending Anti-cycling - The control will bypass the anti-cycling time if the inlet water temperature drops too quickly. The control will use the inlet water temperature at Heat Exchanger 1 when it shuts off as the starting point. If the temperature drops below the temperature parameter the control will abort anti-cycling and allow the boiler to fire. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 86°F. The default value is 10°F.

• Anti-cycling Time - Once a system heat call has been satisfied, a set amount of time must elapse before the control will respond to a new system heat call. The control will block the new system heat call and Anti cycling will be shown in the boiler status display until the time has elapsed or the inlet water temperature drops below the parameter drop in inlet temperature for ending anti-cycling. This parameter can only be changed by the installer. The time range for this parameter is 0 minutes to 40 minutes. The default value is 1 minute.

Reference page 18 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

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Outdoor Reset Parameters Screen:

Service Manual

When the outdoor air sensor is installed, the control will calculate the water temperature set point based on the outdoor air temperature. As the outdoor air temperature drops the water temperature set point increases. This feature allows the boiler to be more efficient in periods of mild weather.

The Outdoor Reset Screen allows access to eight (8) parameters. Those parameters are as follows:

• Reset Temperature at Low Outdoor Temperature - When the outdoor air temperature drops to its minimum setting, the water temperature will be at this point, if the user set point parameter is set higher. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 190°F. The default value is 180°F.

• Reset Temperature at High Outdoor Temperature When the outdoor air temperature rises to or above its maximum setting, the water temperature will be at this point. This parameter can only be changed by the installer. The temperature range of this parameter is 32° to 180°F. The default value is 100°F.

• Outdoor Temperature at High Reset Temperature When the outdoor air temperature drops to this point, the water temperature will be at its maximum setting. However, if the user set point is set lower, the water temperature will be limited by the user set point. This parameter can only be changed by the installer. The temperature rane of this parameter is -22° to 70°F. The default value is 25°F.

• Outdoor Temperature at Low Reset Temperature - When the outdoor air temperature rises to or above this point, the water temperature will be at its minimum setting. This parameter can only be changed by the installer. The temperature range of this parameter is 25° to 86°F. The default value is 70°F.

• Outdoor Shutdown Set Point - When the outdoor air temperature rises above this point, the control will block all system heat calls. The Hot Water Generation call will be unaffected. This parameter can be changed by the user or the installer. The temperature range of this parameter is 32° to 122°F. The default value is 70°F.

• Outdoor Shutdown Differential - The number of degrees below the outdoor shutdown set point that the outdoor air temperature must go before the boiler will respond to a system heat call. This parameter can be changed by the user or the installer. The temperature range of this parameter is 0° to 90°F. The default value is 10°F.

• Boost Time - If the boost increment parameter is set to active, the boost time parameter will set the amount of time that must elapse with a system heat call before the water temperature set point will be increased. This parameter can be changed by the user or the installer. The time range for this parameter is 0 minutes to 250 minutes. The default value is 20 minutes.

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Service Manual

• Boost Increment - If a system heat call last longer than the programmed boost time setting and there have been no Hot Water Generation calls, the control will increase the water temperature set point by the amount in this parameter. If the system heat call continues through another time period, the set point will be increased again. This will continue until either the system heat call ends, a maximum of 20 increases has occurred, or the maximum set point has been reached. Once the system heat call has been satisfied the set point will revert back to its calculated setting. This parameter can be changed by the user or the installer. The temperature range of this parameter is 0° to 45°F. The default value is 0°F. This feature will be active if this parameter is set to anything other than 0°F.

Reference page 18 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

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Night Setback Parameters Screen:

Service Manual

The Night Setback Screen allows access to 15 parameters. Those parameters are as follows:

• Date and Time - The control uses an internal clock for the night setback feature and for logging of events. For these features to work correctly, the clock must be set when the boiler is first installed or any time the boiler has been powered off for more than 30 days.

To set the clock, press the SELECT button in the upper righthand corner of the display. The date and time are displayed as “Day dd/mm/yy hh:mm”. Day = day of the week (1 = Monday, 2 = Tuesday, etc.), dd = date, mm = month, yy = year, hh = hour, mm = minutes (24 hours time; 2:30 PM = 14:30). Using the keypad, adjust the date and time by working from left to right. If a digit has been entered incorrectly, press the left arrow key on the keypad to back the digit up. If a change is not necessary, press the BACK button to return to the Parameter List Screen. Once the correct date and time have been entered press the OK button on the display to program the date and time into memory and return to the Parameter List Screen.

The internal clock does not adjust for Daylight Savings Time and therefore, will require a manual adjustment.

Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you wish to skip a day and no night setback is necessary, program the on and off times the same and set them prior to 12:00 (noon). If you wish to keep night setback active throughout an entire day, program the on and off times the same and set them after 12:00 (noon). The default times for each day will be on at 18:00 and off at 8:00.

To adjust the on and off times, select the parameter to be adjusted by pressing the SELECT button next to the parameter. Using the keypad, adjust the time by working from left to right. If a digit has been entered incorrectly, press the left arrow key on the keypad to back the digit up. If no change is necessary, press the BACK button to return to the Parameter List Screen. Once the correct time has been entered press the OK button on the display to program the time into memory and return to the Parameter List Screen.

Reference page 21 for information regarding NSB Set Point Temp programming.

Apply button - If changes have been made to the date and time or to one of the on or off timers, the APPLY button must be pressed to program the changes into the control module and return to the Setup Screen.

• On Timer and Off Timer - If the parameter night setback set point is set to anything other than 32°F, the night setback feature becomes active. This will require on and off times to be programmed for the days that reduced temperatures are required. Each day of the week (Monday through Sunday) will have an on and off time.

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Back button - Pressing this button will back the screen up to the previous screen.

1 Service (continued)

Cascade Parameters Screen:

Service Manual

Cascade Operation

When multiple boilers are installed, they can be wired together in a cascade sequence. A maximum of eight (8) boilers can be controlled from a single control. In this application one boiler would be designated as the Leader and all others would be designated as Members. The designated Leader boiler determines the total output needed from the group based on the set point and the system sensor reading. Reference the Wiring of the Cascade section in the SYNC Installation and Operation Manual for more information regarding the cascade feature.

The Cascade Screen allows access to four (4) parameters. Those parameters are as follows:

• Cascade Address - The boiler designated as the Leader should be programmed with address 0-1. All Member boilers require addresses from 2-3 through 14-15. The address must be different for each member. The addresses can be in any order, regardless of the order in which the boilers are wired together. This parameter can only be changed by the installer. The default address is 0-1.

• Cascade Off Differential - Sets how many degrees above set point the temperature has to go before the lead boiler will shut off. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 72°F. The default value is 10°F.

• Cascade Off/On Differential - Sets how many degrees below the turn off temperature (set point + Cascade Off Differential) the temperature has to go before the lead boiler will turn on. This parameter can only be changed by the installer. The temperature range of this parameter is 0° to 72°F. The default value is 20°F.

• Maximum Outlet Temperature - Sets the set point that individual boilers will attempt to achieve in a cascade. When a boiler is commanded to fire by the Leader, it will attempt to achieve this temperature at its outlet. The Leader will control the modulation of the last boiler to fire in order to hold the temperature at the system supply sensor to the user set point. If any of the boiler outlet temperatures reach the Maximum Outlet Temperature setting, the boiler will then modulate down on its own in order to keep its outlet temperature within the Maximum Outlet Temperature setting. Therefore, this parameter can be used to limit the outlet temperatures of all the boilers in a cascade.

Note that this parameter does not apply when the boiler is in Hot Water Generation Mode. This parameter can be changed by the user or the installer. The temperature range of this parameter is 32° to 212°F. The default value is 185°F.

Reference page 18 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

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Pumps Parameters Screen:

Service Manual

The Pumps Screen allows access to four (4) parameters. Those parameters are as follows:

• Boiler Pump Delay - Sets the length of time the boiler pumps will run after a system heat call has been satisfied. This parameter can only be changed by the installer. The time range for this parameter is 0 minutes to 40 minutes. The default time is 30 seconds.

• HW Pump Delay - Sets the length of time the Hot Water Generation pumps (if connected) will run after a Hot Water Generation call has been satisfied. This parameter can only be changed by the installer. The time range for this parameter is 0 minutes to 40 minutes. The default time is 30 seconds.

• System Pump Delay - Sets the length of time the system pump (if connected) will run after a system heat call has been satisfied. This parameter can only be changed by the installer. The time range for this parameter is 0 minutes to 40 minutes. the default time is 30 seconds.

• System Pump Mode - Sets the configuration of the system pump. The configuration selections are:

0. The system pump will be on continuously except during outdoor shutdown.

1. The system pump will be off.

2. The system pump will be on only during a system heat call.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

This parameter can only be changed by the installer. The default configuration is 2: On only during a system heat call.

Reference page 18 for information regarding changing parameters.

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1 Service (continued)

0 - 10Vdc BMS Parameters Screen:

Service Manual

0-10Vdc Operation

When the Demand Configuration parameter (see page 19) is set to either Cascade BMS Thermostat Based, Cascade BMS Voltage Based, Cascade Modbus BMS Thermostat Based, or Cascade Modbus BMS Voltage Based; a 0 - 10Vdc signal can be supplied to the terminal strip connection or through Modbus communications to control a single unit or a multiple unit cascade.

The BMS Screen allows access to 11 parameters. Those parameters are:

• BMS Type - When the unit or cascade is controlled by the 0-10Vdc BMS input, the voltage signal can control either the modulation rate or set point. This parameter can only be changed by the installer. The default method of control is modulation rate.

• BMS Set Point at Minimum Voltage - Determines the set point used by the unit or cascade when the BMS voltage is at or below the setting of the BMS Voltage Minimum Set Point parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The temperature range of this parameter is 32° to 179°F. The default value is 70°F.

• BMS Set Point at Maximum Voltage - Determines the set point used by the unit or cascade when the BMS voltage is at or above the setting of the BMS Voltage Maximum Set Point parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The temperature range of this parameter is 70° to 190°F. The default value is 179°F.

• BMS Voltage at Minimum Set Point - Determines the voltage at which the external signal begins to increase the set point. Below this voltage, the set point will be at the setting of the BMS Set Point Minimum Voltage parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 2V.

• BMS Voltage at Maximum Set Point - Determines the voltage at which the external signal forces the set point to the setting of the BMS Set Point Maximum Voltage parameter. This parameter is only active when the BMS Type is set to Set Point. This parameter can only be changed by the installer. The range of this parameter is 2V to 10V. The default value is 10V.

• BMS Voltage at Start Call for Heat - When the Demand Configuration parameter (see page 19) is set to Cascade BMS Voltage Based, this parameter determines the BMS input voltage at which the unit or cascade is enabled. The unit or cascade will become enabled when the BMS input voltage rises up to or above this value. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 2V.

• Drop in BMS Voltage to End Call for Heat - When the Demand Configuration parameter (see page 19) is set to Cascade BMS Voltage Based, this parameter determines the BMS input voltage at which the unit or cascade is disabled. The unit or cascade will become disabled when the BMS input voltage drops down to or below the BMS voltage at start call for heat minus this value. This parameter can only be changed by the installer. The range of this parameter is 0 to 10V. The default value is 1V.

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• BMS Modulation at Minimum Voltage - Determines the modulation rate of the unit or cascade when the BMS input voltage is at or below the setting of the BMS Voltage at Minimum Modulation parameter. This parameter is only active when the BMS Type is set to modulation rate. This parameter can only be changed by the installer. The range of this parameter is 0% to 100%. The default value is 14.5%.

• BMS Modulation at Maximum Voltage - Determines the modulation rate of the unit or cascade when the BMS input voltage is at or above the setting of the BMS Voltage at Maximum Modulation parameter. This parameter is only active when the BMS Type is set to modulation rate. This parameter can only be changed by the installer. The range of this parameter is 14.5% to 100%. The default value is 100%.

• BMS Voltage at Minimum Modulation - Determines the voltage at which the external signal begins to increase the modulation rate (power). Below this voltage, the modulation rate (power) will be at the setting of the BMS Modulation at Minimum Voltage parameter. This parameter is only active when the BMS Type is set to modulation rate (power). This parameter can only be changed by the installer. The range of this parameter is 0V to 10V. The default value is 2V.

Reference page 18 for information regarding changing parameters.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Back button - Pressing this button will back the screen up to the previous screen.

• BMS Voltage at Maximum Modulation - Determines the voltage at which the external signal forces the modulation rate (power) to the setting of the BMS Modulation at Maximum Voltage parameter. This parameter is only active when the BMS Type is set to modulation rate (power). This parameter can only be changed by the installer. The range of this parameter is 2V to 10V. The default value is 10V.

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Cascade Screen:

Service Manual

The Cascade Screen provides the status of the cascade system. Items that can be viewed on the Cascade Screen are as follows:

Boiler Power Level Indicators - For each boiler present in the cascade a power level indicator will be present above its corresponding number. The level will rise and fall indicating the approximate power level of the boiler. The display box underneath each number will display “HW” when that boiler is providing heat for a Hot Water Generation call.

On Timer and Off Timer - The ON and OFF timers are used to force each boiler in the cascade to have a minimum on and off time to prevent short cycling.

Block Switch On Timer - Whenever a boiler is commanded to start, the block switch on timer is started. This provides a delay between the first ignition system and the second ignition system inside the boiler. Once the second ignition system is started, the timer is reset and the next boiler is prevented from starting until the timer times out. This process is repeated for each boiler in the cascade.

Demand - Shows the status of the cascade. Displayed items are:

No Demand - the Cascade leader has not received a system heat call.

 SH Demand - the Cascade leader has received a system heat call.

 Set Point Met - the system temperature has met the User Set Point + the Off Differential.

  Pump Delay - the cascade has satisfied a system

heat call and the system pump is running for a fixed time.

System Temperature - This is the water temperature as measured by the system sensor located in the system supply piping.

SH Set Point - This is the set point of the cascade system. The boiler designated as the Leader will use this set point to determine the power level required to bring the system temperature to this point. A default value of 50°F (10°C) is displayed when the SH Call for Heat is inactive.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. This screens shows the current status of the SYNC boiler. Reference the Status Screen on page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

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Service Manual

1

On

34

80

55

The Building Screen displays information that is specific to the Building Automation System and is being transmitted through the Modbus communication link:

Modbus Address - This is the address of a specific SYNC boiler. This address is set by dip switches on the Modbus communication board. The value displayed here should be the same as the value of the dip switches. The Building Automation System should use this address to communicate with the boiler.

Boiler Enable - This displays the enable status that has been transmitted to the boiler by the Building Automation System.

Boiler State - This displays the state code of the boiler. Please reference the SYNC Modbus Instruction Manual for a full definition of each code.

Boiler Command - This displays the value written to register 40003 of the Modbus communication board by the Building Automation System. The value is displayed as the percent of firing rate, 80 = 80% firing rate.

Effective Setpoint - This displays the value written to register 40003 of the Modbus communication board by the Building Automation System. The value is displayed as the effective setpoint in degrees (°F or °C).

Note: The boiler can be configured to operate off the boiler command or the effective setpoint. The boiler configuration determines which value is meaningful.

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1 Service (continued)

Temps Screen:

Service Manual

The Temps Screen displays the various temperatures as measured by sensors connected to each control module. Items that can be viewed on the Temps Screen are as follows:

• Heat Exchanger 1/2 Inlet - This is the water temperature as measured by the sensor located in the inlet of each heat exchanger.

• Heat Exchanger 1/2 Outlet - This is the water temperature as measured by the sensor located in the outlet of each heat exchanger.

• Heat Exchanger 1/2 Flue - This is the temperature as measured by the sensor located in the flue connection on each heat exchanger.

• Set Point - Two temperatures are shown in this display. the top temperature is the Cascade Maximum Outlet Temperature. The lower temperature is the tank set point for a Hot Water Generation call.

• System Sensor - This is the water temperature as measured by the sensor located in the system supply piping. The system sensor must be installed for the proper operation of the boiler.

• Outdoor Sensor - This is the temperature of the outside air as measured by the sensor located outside. The use of the outdoor sensor is optional. If the sensor is connected the control will calculate the set point based on the programmed outdoor parameters. See page 22 for information regarding adjusting the outdoor parameters. If the sensor is not present, none will be shown in the display.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. this screen shows the current status of the SYNC boiler. Reference page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

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Burners Screen:

Service Manual

This screen provides the status of the combustion air blowers and flame signals. Items that can be viewed on the Burners Screen are as follows:

• Blower Power Level Indicator - Two (2) blowers are depicted on the display. The top blower corresponds with Heat Exchanger 1 or Top heat exchanger. The lower blower corresponds with Heat Exchanger 2 or Bottom heat exchanger. Beside each blower is a power level indicator. The level will increase and decrease indicating the approximate power level of the blower. The display box underneath each indicator level will display the firing rate of each control module.

• RPM’s - Each blower will display the rpm that the control module is requiring of the blower.

• Flame Signal - The flame signal for each control module will be displayed in dc microamps.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. this screen shows the current status of the SYNC boiler. Reference page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

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1 Service (continued)

Graph Select Screen:

Service Manual

The Graphs Screen consists of two (2) different screens. The first screen is the Parameter Selection Screen. By pressing the box beside the desired item, a check will appear in the selected box and the control will graph the status of that item. A maximum of five (5) items can be graphed at one time.

The second screen is accessed by pressing the NEXT button. Once the items to be graphed are selected, press the NEXT button to view the graph. Each item graphed will have a different color line to represent it. The items selected will be shown in a display bar with their Min and Max ranges listed below them. Press the BACK button to return to the Parameter Selection Screen.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. this screen shows the current status of the SYNC boiler. Reference page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

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History Screen:

Service Manual

The History Screen shows the status of various counters and faults for each control module. Selection of the control module to be viewed is accomplished by pressing the SELECT button. The control module being displayed is shown in the module box. Items that can be viewed on the History Screen are as follows:

• Power Hours - Shows the number of hours the control has been powered on.

• Successful Ignitions - Shows the number of times the control has successfully ignited.

• Hours SH < 50% - Shows the number of hours the control has operated at less than 50%.

• Total Ignitions - Shows the total number of times the control has attempted to ignite.

• Last 10 Faults - Shows the last 10 faults of the control module by date and time.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. this screen shows the current status of the SYNC boiler. Reference page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

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1 Service (continued)

Service Mode Screen:

Service Manual

The Service Mode Screen allows the individual control modules to override all other heat demands and operate at a full fire condition for the purpose of combustion analysis. Selection of the control module to be placed into Service Mode is accomplished by pressing the SELECT button. The control module being placed into Service Mode is shown in the module box.

To place the unit into Service Mode, press the ON/OFF button until ON is displayed. The control module will override all other heat demands, however, all safeties will be active. If no buttons are pressed, the control module will automatically revert back to its original state after the Max Service Time delay has expired. The default setting for the Max Service Time is 20 minutes. To take the control module out of Service Mode, press the ON/OFF button until OFF is displayed.

Items that can be viewed and interacted with on the Service Mode Screen are as follows:

• Blower Power Level Indicator - A blower is depicted on the display with a power level indicator beside it. The level will increase and decrease indicating the approximate power level of the blower. The display box underneath the indicator level will display the firing rate of the control module.

Time - The time is displayed in the upper right-hand corner of the display. It is displayed in 24 hour format. Reference the night setback parameters on page 24 for information regarding adjusting the date and time.

Status button - Pressing this button displays the Status Screen. this screen shows the current status of the SYNC boiler. Reference page 13 for more information regarding this screen.

Main button - Pressing this button displays the Main Screen. From this screen, navigation to eight (8) other screens is possible. Reference the Main Screen on page 17 for more information regarding this screen.

• RPM’s - The blower motor rpm that the control module is requiring of the blower.

• Plus and Minus Buttons - By pressing the plus or minus button the rpm of the blower motor can be increased or decreased.

• Flame Signal - The flame signal for the control module will be displayed in dc microamps.

35

2 Maintenance

Maintenance and annual startup

Table 2A Service and Maintenance Schedules

Service Manual

Service technician

(see the following pages for instructions)

General:

• Address reported problems

• Inspect interior; clean and vacuum if necessary;

• Clean condensate trap and fill with fresh water

• Check for leaks (water, gas, flue, condensate)

• Verify flue and air lines in good condition and sealed tight

• Check system water pressure/system piping/expansion tank

• Check control settings

• Check ignition and flame sense electrodes (sand off any deposits; clean and reposition)

Owner maintenance

(see the SYNC User’s Information Manual for

instructions)

• Check boiler area

Daily

Monthly

• Check pressure/temperature gauge

• Check vent piping

• Check air piping

• Check air and vent termination screens

• Check relief valve

• Check condensate drain system

• Check wiring and connections

• Perform start-up checkout and performance verification per Section 9

ANNUAL START-UP

in the SYNC Installation and Operation Manual.

• Flame inspection (stable, uniform)

• Flame signal (at least 10 microamps at high fire)

• Clean the heat exchanger if flue temperature is more than 54°F (30°C) above return water temperature.

• Test low water flow conditions.

If combustion or performance indicate need:

• Clean heat exchanger

• Remove and clean burner using compressed air only

• Clean the blower wheel

Every

6 months

End

of season

months

• Check automatic air vents

• Test low water cutoff

• Reset button (low water cutoff)

• Check boiler piping (gas and water) for leaks

• Operate relief valve

• Shut boiler down (unless boiler used for hot water generation)

36

2 Maintenance (continued)

Service Manual

 WARNING

Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the boiler. Failure to perform the service and maintenance could result in damage to the boiler or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.

 WARNING

The boiler should be inspected annually only by a qualified service technician. In addition, the maintenance and care of the boiler designated in Table 2A and explained on the following pages must be performed to assure maximum boiler efficiency and reliability. Failure to service and maintain the boiler and system could result in equipment failure.

 WARNING

Electrical shock hazard – Turn off power to the boiler before any service operation on the boiler except as noted otherwise in this instruction manual. Failure to turn off electrical power could result in electrical shock, causing severe personal injury or death.

Address reported problems

1. Inspect any problems reported by the owner and correct before proceeding.

Inspect boiler area

1. Verify that boiler area is free of any combustible materials, gasoline and other flammable vapors and liquids.

2. Verify that air intake area is free of any of the contaminants listed in Section 1 of the SYNC Installation and Operation Manual. If any of these are present in the boiler intake air vicinity, they must be removed. If they cannot be removed, reinstall the air and vent lines per this manual and the SYNC Installation and Operation Manual.

Inspect boiler interior

Figure 2-1 Condensate Trap

PVC TEE ASSEMBLY

(FACTORY SUPPLIED)

TO FLOOR

DRAIN

2” PVC CAP WITH

BLOCKED DRAIN SWITCH

RETAINING

SCREW

CONDENSATE FROM

HEAT EXCHANGER

1. Remove the front access cover and inspect the interior of the boiler.

2. Vacuum any sediment from inside the boiler and components. Remove any obstructions.

Clean condensate trap

1. Inspect the condensate drain line, condensate PVC fittings, and condensate trap.

2. Remove the PVC cap retaining screw from the PVC cap (FIG. 2-1).

3. Remove the 2 inch PVC cap with the switch located at the top of the trap (FIG. 2-1).

4. Remove any sediment in the trap.

5. Fill with fresh water until the water begins to pour out of the drain.

6. Replace the cap. Press the cap onto the trap until the cap makes contact with the drain.

7. Replace the retaining screw.

 WARNING

The condensate trap must be filled with water during all times of boiler operation to avoid flue gas emission from the condensate drain line. Failure to fill the trap could result in severe personal injury or death.

Check all piping for leaks

 WARNING

1. Inspect all water and gas piping and verify to be leak free.

2. Look for signs of leaking lines and correct any problems found.

3. Check gas line using the procedure found in Section 6 - Gas Connections of the SYNC Installation and Operation Manual.

Eliminate all system or boiler leaks. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating heat exchanger, and causing heat exchanger failure. Leaking water may also cause severe property damage.

37

2 Maintenance

Service Manual

Flue vent system and air piping

1. Visually inspect the entire flue gas venting system and air piping for blockage, deterioration or leakage. Repair any joints that show signs of leakage. Verify that air inlet pipe is connected and properly sealed.

2. Verify that boiler vent discharge and air intake are clean and free of obstructions.

 WARNING

Failure to inspect for the above conditions and have them repaired can result in severe personal injury or death.

Check water system

1. Verify all system components are correctly installed and

operational.

2. Check the cold fill pressure for the system. Verify it is

correct (must be a minimum of 12 psi (82.7 kPa)).

3. Watch the system pressure as the boiler heats up (during

testing) to ensure pressure does not rise too high. Excessive pressure rise indicates expansion tank sizing or performance problem.

4. Inspect automatic air vents and air separators. Remove

air vent caps and briefly press push valve to flush vent. Replace caps. Make sure vents do not leak. Replace any leaking vents.

Check expansion tank

1. Expansion tanks provide space for water to move in

and out as the heating system water expands due to temperature increase or contracts as the water cools. Tanks may be open, closed or diaphragm or bladder type. See Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for suggested best location of expansion tanks and air eliminators.

Check boiler relief valve

1. Inspect the relief valve and lift the lever to verify flow.

Before operating any relief valve, ensure that it is piped with its discharge in a safe area to avoid severe scald potential. Read Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual before proceeding further.

 WARNING

2. After following the above warning directions, if the relief valve weeps or will not seat properly, replace the relief valve. Ensure that the reason for relief valve weeping is the valve and not over-pressurization of the system due to expansion tank waterlogging or undersizing.

Safety relief valves should be re-inspected AT LEAST ONCE EVERY THREE YEARS, by a licensed plumbing contractor or authorized inspection agency, to ensure that the product has not been affected by corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components over time, rendering the valve inoperative. Such conditions are not detectable unless the valve and its components are physically removed and inspected. This inspection must only be conducted by a plumbing contractor or authorized inspection agency – not by the owner. Failure to re-inspect the boiler relief valve as directed could result in unsafe pressure buildup, which can result in severe personal injury, death, or substantial property damage.

Following installation, the valve lever must be operated AT LEAST ONCE A YEAR to ensure that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve, rendering it inoperative. When manually operating the lever, water will discharge and precautions must be taken to avoid contact with hot water and to avoid water damage. Before operating lever, check to see that a discharge line is connected to this valve directing the flow of hot water from the valve to a proper place of disposal. Otherwise severe personal injury may result. If no water flows, valve is inoperative. Shut down the boiler until a new relief valve has been installed.

38

)

2 Maintenance (continued)

Service Manual

Inspect ignition and flame sense electrodes

1. Remove the ignition and flame sense electrodes from the boiler heat exchanger access cover.

2. Remove any deposits accumulated on the ignition/flame sense electrode using sandpaper. If the electrodes cannot be cleaned satisfactorily, replace with new ones.

3. Replace ignition/flame sense electrode, making sure gasket is in good condition and correctly positioned.

Check ignition ground wiring

1. Inspect boiler ground wire from the heat exchanger access cover to ground terminal strip.

2. Verify all wiring is in good condition and securely attached.

3. Check ground continuity of wiring using continuity meter.

4. Replace ground wires if ground continuity is not satisfactory.

Check all boiler wiring

Check burner flame

1. Inspect flame through observation window.

2. If the flame is unsatisfactory at either high fire or low fire, turn off boiler and allow boiler to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building.

3. Remove the burner, reference FIG. 2-2.

4. When replacing the burner, ensure gasket is in good condition and positioned correctly (FIG. 2-2).

Figure 2-2 Burner Assembly

DOOR FIBER

BURNER DOOR

HEX NUT (6)

BURNER

AIR/GAS GASKET

FLAPPER VALVE

SCREW (5X)

FLAPPER VALVE

FLAME SENSE

SCREW (2X)

IGNITER

FLAME SENSE

IGNITER GASKET

FLAME SENSE

GASKET

IGNITER SCREW (2X

1. Inspect all boiler wiring, making sure wires are in good condition and securely attached.

Check control settings

1. Go to the Setup Screen and check all settings. See Section 1 of this manual. Adjust settings if necessary. See Section 1 of this manual for adjustment procedures.

2. Check settings of external limit controls (if any) and adjust if necessary.

Perform start-up and checks

1. Start boiler and perform checks and tests specified

in Section 9 - Start-up of the SYNC Installation and Operation Manual.

2. Verify cold fill pressure is correct and that operating

pressure does not go too high.

39

2 Maintenance (continued)

Service Manual

Check flame signal

1. At high fire the flame signal shown on the display should be at least 10 microamps.

2. A lower flame signal may indicate a fouled or damaged flame sense electrode. If cleaning the flame sense electrode does not improve, ground wiring is in good condition, and ground continuity is satisfactory, replace the flame sense electrode.

3. See Section 3 - Troubleshooting in this manual for other procedures to deal with low flame signal.

Review with owner

1. Review the SYNC User’s Information Manual with the owner.

2. Emphasize the need to perform the maintenance schedule specified in the SYNC User’s Information Manual (and in this manual as well).

3. Remind the owner of the need to call a licensed contractor should the boiler or system exhibit any unusual behavior.

4. Remind the owner to follow the proper shutdown procedure and to schedule an annual start-up at the beginning of the next heating season.

5. Remove the condensate hose from the heat exchanger end. Connect a field supplied 3/4” diameter hose to a drain pan. Using field supplied means, cover the refractory in the back of the combustion chamber of the heat exchanger.

6. Use a vacuum cleaner to remove any accumulation on the boiler heating surfaces. Do not use any solvent.

7. Brush the heat exchanger while dry using a nylon bristle brush. Caution: DO NOT use a metal brush. Re-vacuum the heat exchanger.

8. Finish cleaning using a clean cloth dampened with warm water. Rinse out debris with a low pressure water supply.

9. Allow the heat exchanger to thoroughly dry.

10. Remove the field supplied rear refractory cover from the back of the combustion chamber of the heat exchanger and reassemble.

11. Close isolation valves on piping to isolate boiler from system. Attach a hose to the boiler drain and flush boiler thoroughly with clean water by using purging valves to allow water to flow through the water make-up line to the boiler.

12. Perform start-up and check-out procedures in the Check Flame and Combustion Section of the SYNC Installation and Operation Manual.

13. Replace the access cover and restore boiler to operation.

Table 2B Heat Exchanger Cleaning Kits

Cleaning boiler heat exchanger

For recommended materials; including brush, appropriate extension(s), refractory cover, and detailed instructions see Table 2B - Heat Exchanger Cleaning Kits.

1. Shut down boiler:

• Follow the “To Turn Off Gas to Appliance” instructions for the boiler in the SYNC Installation and Operation Manual.

• Do not drain the boiler unless it will be exposed to freezing temperatures. If using freeze prevention fluid in system, do not drain.

2. Allow time for the boiler to cool to room temperature if it has been firing.

3. Remove the nuts securing the heat exchanger access cover to the heat exchanger and set aside.

4. Remove the heat exchanger access cover, burner, and

gas/air arm assembly.

 WARNING

40

The boiler contains ceramic fiber materials. Use care when handling these materials per instructions on page 3 of this manual. Failure to comply could result in severe personal injury.

Model

Number

SB 1.0 - 1.5 KIT30064

 CAUTION

Kit

Number

* Do NOT use a metal brush. Only use the kit provided brush or an equivalent replacement nylon brush.

Part

Number

MSC20083* Nylon 4” Wheel Brush*

MSC20085 1/4” x 12” Drill Extension

MSC20086 1/4” x 24” Drill Extension

Component Description

2 Maintenance

A

Service Manual

Test low water flow conditions

NOTICE

Test procedure

1. Set the SYNC to operate with the demand configuration parameter set to 1 (Cascade Set Point ThermostatBased).

NOTE: This can be accomplished by selecting the

demand configuration parameter in the Service/Setup Menu. See Section 1 of this manual for complete details of the SmartTouch controls.

2. Set the system setpoint to the max user setpoint. Max user setpoint will allow the boiler to operate without reaching this setpoint. The boiler will require a load large enough to dissipate a large portion of the heat it is generating.

3. Simulate a call for heat by placing a jumper wire across the enable contacts on the low voltage terminal strip located at the rear of the unit (FIG. 2-3).

4. Allow the unit to progress through its normal diagnostics and pre-purge programming.

5. Allow the unit to fire and operate until the temperatures stabilize. This occurs when the inlet and outlet temperatures are rising together and the Delta T ( T) is maintained.

This test is to be carried out once the SYNC boiler is completely piped in with adequate gas and water flow. Once the test is completed, ensure that the isolation valve is opened up to allow full water flow.

10. Restrict the isolation valve until both control modules have shut down. If both control modules have been shut down, the test was successful.

11. Disconnect the jumper wire from the low voltage terminal strip connected in step 3.

12. If necessary, reset the demand configuration in the Service/ Setup Menu to the required operational mode.

NOTE: See Section 1 of this manual for complete details of

the SmartTouch controls.

13. Completely open the isolation valve on the outlet piping of the boiler.

14. Resume operation.

NOTE: This lockout is a soft lockout. Once the  T has

decreased to an acceptable level and there is a call for heat, the unit will fire again to meet the demand.

Figure 2-3 Low voltage terminal strip & enable contacts

LOW VOLTAGE CONNECTION BOARD

1 ALARM 2 CONTACTS 3 RUN TIME 4 CONTACTS 5 LOUVER 6 PROVING 7 MODULE 2 8 FLOW SWITCH

9 MODULE 1 10 FLOW SWITCH 11 TANK

ENABLE CONTACTS

12 THERMOSTAT

13 R

ENABLE

14 W

15 SHIELD GND

16 A 17 B 18 SHIELD GND 19 (+)

0 - 10V INPUT

20 (-)

21 SYSTEM 22 SENSOR

23 OUT DOOR 24 SENSOR

25 TANK

26 SENSOR 27 SHIELD GND

28 B 29 A 30 SHIELD GND

LBL20052 REV B

MOD BUS

CASCADE

6. When the unit stabilizes, begin to slowly shut off the

Figure 2-4 Adjust outlet isolation valve

isolation valve on the outlet piping of the boiler (see FIG. 2-4). This will begin to restrict the flow and simulate a low flow condition.

7. While slowly shutting off the isolation valve, refer to the Burner Screen to watch the behavior of the boiler. On this screen, you will witness each individual control module modulating its’ respective burner’s firing rate while reacting to the rising  T.

8. When the  T reaches 50˚F for an individual heat exchanger, the control for the heat exchanger will attempt to modulate the firing rate down to protect it

DJUST OUTLET ISOLATION VALVE ONLY

from low flow conditions.

9. When the  T reaches 60˚F for an individual heat

exchanger, the control module for the heat exchanger will turn off the respective burner.

NOTE: The Temperature Menu will show the inlet and

outlet temperatures for each individual heat exchanger.

41

3 Troubleshooting

Alarm Screen:

Service Manual

If a fault occurs which requires a Manual Reset, the unit will go into a lockout condition and the Alarm Screen will be activated. The screen will switch between a black or red background every 5 seconds with the text “Alarm Unit Needs Servicing” shown on the display.

A message box shows the alarm status of the two (2) control modules. Mod1 is for Control Module 1 and Mod2 is for Control Module 2. A description of the alarm will be beside the control module with the fault. If a control module does not have a fault, “No Alarm Present” will be in the text.

It is possible for one control module to be in alarm while the other continues to function. However, it will not be possible to view any other screens until the control module is reset.

Reset button - The RESET button must be pressed to reset an alarm. Once the button is pressed, the Reset Confirmation Screen appears. You are asked if you wish to reset the control module. If so, press the YES button. If you do not wish to reset the control module press the NO button. If neither button is pressed within 20 seconds, the screen will return to the Alarm Screen.

Once the condition has been corrected and the alarm is reset, the Status Screen will be displayed.

42

3 Troubleshooting (continued)

Service Manual

 WARNING

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Always disconnect power to the boiler before servicing. Failure to comply could result in severe personal injury, death, or substantial property damage.

Never jumper (bypass) any device except for momentary testing as outlined in the Troubleshooting chart. Severe personal injury, death, or substantial property damage can result.

Before troubleshooting:

1. Have the following items: a. Voltmeter that can check 120 VAC, 24 VAC, and 12 VDC. b. Continuity checker. c. Contact thermometer.

2. Check for 120 VAC (minimum 102 VAC to maximum

132 VAC) to boiler.

3. Make sure thermostat is calling for heat and contacts

(including appropriate zone controls) are closed. Check for 24 VAC between thermostat wire nuts and ground.

Check control module fuses

NOTICE

1. Turn OFF the power to the boiler at the external line switch.

2. Remove the front access cover.

3. Remove the two (2) screws securing the control panel to the unit to gain access to the control module.

4. Inspect fuses F2, F3, F4, and F5, see FIG 3-1 below.

Figure 3-1 Control Module Fuses

F4 - 3.15 AMP FUSE

BLOWER

F5 - 5 AMP FUSE

PUMPS

F2 - 3.15 AMP FUSE

24V SUPPLY

ALWAYS check control module fuses before replacing control module or any major components (blower, etc.). If one of these fuses is blown, it can prevent the control module or other components from operating.

F3 - 1.25 AMP FUSE

MAIN BOARD

4. Make sure all external limit controls are installed and

operating.

Check the following:

1. Wire connectors to control module are securely plugged

in at the control module and originating control.

2. Gas pressures:

• Maximum: 14 inches w.c. (3.5 kPa) natural, 14 inches w.c. (3.2 kPa) LP with no flow (lockup) or with boiler on

• Minimum: 4 inches (5 inches on 1.0 models only) w.c. (1.0 kPa) natural, 8 inches w.c. (2.0 kPa) LP with gas flowing (verify during boiler startup)

5. The boiler is shipped with six (6) spare fuses in a plastic bag located under the low water cutoff on the control module.

6. If necessary, replace open fuse (F3 is 1.25 amps, F2 and F4 are 3.15 amps, and F5 is 5 amps).

Note: Fuses F2 - F5 are all slow blow fuses.

 WARNING

7. Re-install the control panel using the two (2) screws removed in Step 3. Re-install the front access cover after fuse inspection.

8. Restore power to the boiler at the external line switch and verify boiler operation (Section 9 - Start-up in the SYNC Boiler Installation and Operation Manual) after completing boiler service.

Do not jumper fuse or replace with any fuse except as specified. Failure to comply could result in severe personal injury, death, or substantial property damage.

43

Service Manual

3 Troubleshooting

Table 3A Troubleshooting Chart - No Display

FAULT CAUSE CORRECTIVE ACTION

- No 120 VAC supplied to unit. • Check external line switch, fuse, or breaker.

• Check position of ON/OFF switch. Turn switch to the ON position.

• Check 120 VAC through the ON/OFF switch.

• Check wiring harness connection between display board and main control board. Connect

No Display

- No voltage through the switch. • Replace switch.

- Bad display board. • Replace board.

harness at both points.

No Burner

Operation

- Bad main control board. • Replace the main control board.

- Blown fuse. • Replace fuse F3 on the main control board, see page 43 of this manual.

- Main control board temperature set point

satisfied.

- Remote thermostat satisfied. • Review remote thermostat setting.

- Outside air temperature above Warm

Weather Shutdown (WWSD) set point for main control board.

- Unit locked out on fault. • Consult display for specific fault. Refer to fault

- Ramp delay active. • Check ramp delay parameter settings. Optional PC

• Review temperature setting.

• Check location of outside air sensor. Check resistance of outdoor air sensor and compare to Table 3D on page 45 of this manual.

descriptions on page 47 of this manual for corrective actions.

software required.

• Turn ramp delay feature off. See page 19 of this manual for instructions on how to turn this feature off.

Unit Does

Not Modulate

Above 50%

44

- Boiler controlled by BMS.

- Flue sensor open.

• Check BMS parameter settings. Optional PC software required.

• Verify that the flue sensor is located in the flue outlet.

• Check wiring connections at the flue sensor.

• Check the resistance of the flue sensor and compare to Table 3C on page 45 of this manual.

Service Manual

3 Troubleshooting (continued)

Checking temperature sensors

The boiler temperature sensors (inlet water, outlet water, system water, flue, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature. If the resistance of the sensor does not closely match its corresponding table, replace the sensor.

Table 3B - Inlet/Outlet System Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

50 18,780 158 1,990

68 12,263 176 1,458

86 8,194 194 1,084

104 5,592 212 817

122 3,893 -- --

140 2,760 -- --

Table 3C - Flue Temperature Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

68 14,773 176 1,707

86 9,804 194 1,266

104 6,652 212 952

122 4,607 230 726

140 3,252 248 560

158 2,337 -- --

Table 3D - Outdoor Air Sensor Resistance vs. Temperature

Temperature Resistance Temperature Resistance

-50 490,813 20 46,218

-40 336,606 30 34,558

-30 234,196 40 26,099

-20 165,180 50 19,900

10 118,018 60 15,311

0 85,362 70 11,883

10 62,465 80 9,299

45

Service Manual

3 Troubleshooting

Table 3E Troubleshooting Chart - Noisy System

FAULT CAUSE CORRECTIVE ACTION

Noisy

Operation

No Pump

Operation -

Boiler Pump

System Pump

or

HW Pump

- Supply gas problem. Natural gas pressures should be between 4 inches w.c. (1.0 kPa) and 14 inches w.c. (3.5 kPa). LP gas pressures should be between 8 inches w.c. (2.0 kPa) and 14 inches w.c. (3.2 kPa).

- Gas/air mixture problem.

- Dirty/damaged burner.

- Low water flow through the heat exchanger.

- Air in the piping system. • Properly purge all air from the piping system.

- Low system water pressure.

- Blown fuse.

- Faulty pump. • Replace pump.

- Internal fault on control board. • Replace main control board.

- Faulty pump relay. • Replace relay.

• Refer to Section 6 - Gas Connections of the SYNC Installation and Operation Manual for detailed information concerning the gas supply.

• Refer to the Gas Valve Adjustment Procedure on page 55 of this manual for the proper gas valve setting. Verify that the vent/air intake lengths do not exceed the maximum listed in the General Venting section of the SYNC Installation and Operation Manual.

• Refer to page 39 in this manual for the burner removal and inspection procedure. Clean or replace the burner as necessary.

• Refer to Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for minimum flow rates. Verify that the boiler is piped in a primary/secondary fashion and that the boiler and system pump are running on a call for heat.

• Verify system pressure is a minimum of 12 psi (82.7 kPa).

• Replace fuse F5 on the control board, see page 43 of this manual.

Relief Valve

Opening

Gas Pressure

Switch

(will require a

manual reset once

the condition has

been corrected.

Press the RESET

button on the

display to reset.)

46

- System pressure exceeds relief valve setting.

Either the manual reset low gas pressure switch or the manual reset high gas pressure switch tripped.

• Lower the system pressure below the 50 psi (344.7 kPa) rating of the supplied relief valve or replace the standard relief valve with a higher rated valve up to the maximum pressure of the heat exchanger.

• Improperly sized expansion tank.

• Reset the pressure switches.

• Measure the supply gas pressure to determine cause of failure. Natural gas pressures should be between 4 - 14 inches w.c. (1.0 - 3.5 kPa) and LP gas pressures should be between 8 - 14 inches w.c. (2.0 - 3.2 kPa).

• Refer to Section 6 - Gas Connections of the SYNC Installation and Operation Manual for detailed information concerning the gas supply.

• Correct the supply gas pressure if necessary.

• Check for a loose or misplaced jumper if pressure switches are not installed.

Service Manual

3 Troubleshooting (continued)

Table 3F Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

• Check boiler pump operation on a call for heat.

Flow Switch/

LWCO

(will require a manual

reset once condition has

been corrected. Press the RESET button on

the display to reset.)

Condensate

Drain Blocked

(will require a manual

reset once condition has

been corrected. Press the RESET button on

the display to reset.)

Either the low water cutoff or the optional flow switch is not making.

Blown fuse.

The blocked drain switch has detected excessive condensate build up inside the unit.

• Check for closed valves or obstructions in the boiler piping.

• Verify system is full of water and all air has been purged from the system.

• Check for loose or misplaced jumpers if flow switch is not installed.

• Replace fuse F2 on the control board, see page 43 of this manual.

• Check condensate tube from unit to floor drain for proper installation and obstructions.

• Inspect condensate trap for blockage. Clean if necessary.

• Check for loose wiring connection at wire harness plug.

• Bad blocked drain switch. Replace switch.

Flame out of

Sequence

(will require a manual

reset once the condition

has been corrected.

Press the RESET button

on the display to reset.)

Gas Valve / Connection

(will require a manual

reset once the condition

has been corrected.

Press the RESET button

on the display to reset.)

Burner Did Not

Light

(will require a manual

reset once the condition

has been corrected.

Press the RESET button

on the display to reset.)

The flame detector circuit is seeing a flame signal while no flame is present.

The main control board did not detect the gas valve.

The unit has failed to prove main burner ignition after one attempt. It will require a manual reset before attempting to fire again.

• Check supply voltage for proper polarity.

• Check external wiring for voltage feedback.

• Check the flame rod and make sure it is clean.

• Check the internal wiring for bad connections.

• Replace main control board.

• Check wiring harness connection at the gas valve and at the main control board.

• Replace the gas valve wire harness.

• Replace the gas valve.

• Replace the main control board.

• Inspect spark electrode and associated wiring for damage and connection. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Check for proper electrical grounding of the unit.

• Check incoming supply gas pressure. Natural gas pressures should be between 4 - 14 inches w.c. (1.0 - 3.5 kPa) and LP gas pressures should be between 8 - 14 inches w.c. (2.0 - 3.2 kPa). Refer to Section 6 - Gas Connections of the SYNC Installation and Operation Manual for detailed information concerning the gas supply.

• Verify that the plastic hose from the gas valve to the air inlet is connected and is not damaged.

• Verify that the vent/air intake pipes are correctly installed and that there are no obstructions.

• Check for 24 VAC to the gas valve at the 2-pin connection on the side of the main control board during the ignition attempt. If no voltage is present, replace the main control board.

47

Service Manual

3 Troubleshooting

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

• If 24 VAC is present at the main control board, check the wiring between the main control board and the gas valve. Replace the wiring if necessary. Do not disconnect the wiring from the gas valve and attempt to measure voltage at that point. The main control board can detect if the gas valve is not connected and will display the Gas Valve / Connection fault.

• If 24 VAC is present, check the outlet of the valve to

Burner Did Not

Light (cont’d)

(will require a manual

reset once the condition

has been corrected.

Press the RESET button

on the display to reset.)

The unit has failed to prove main burner ignition after one attempt. It will require a manual reset before attempting to fire again.

ensure the valve is flowing gas. With a manometer connected to the outlet tap of the gas valve, when the unit is in the prepurge period, there should be a negative pressure present. When the valve is energized a change in pressure should occur. If the pressure change does not occur, the gas valve is not opening. Replace the gas valve.

• Inspect flame sensor and associated wiring. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

Flame Lost

While Running

(will require a manual

reset once the condition

has been corrected.

Press the RESET button

on the display to reset.)

The unit was running and lost the flame signal. This condition occurred twice .

• Inspect the burner. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Replace the main control board.

• Inspect spark electrode and associated wiring for damage and connection. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Check for proper electrical grounding of unit.

• Check incoming supply gas pressure. Natural gas pressures should be between 4 - 14 inches w.c. (1.0 - 3.5 kPa) and LP gas pressures should be between 8 - 14 inches w.c. (2.0 - 3.2 kPa). Refer to Section 6 - Gas Connections of the SYNC Installation and Operation Manual for detailed information concerning the gas supply.

• Verify that the plastic hose from the gas valve to the air inlet is connected and is not damaged.

• Verify that the vent/air intake pipes are installed correctly and there are no obstructions.

• Check for 24 VAC to the gas valve at the 2-pin connection on the side of the main control board during the ignition attempt. If no voltage is present, replace the main control board.

48

Service Manual

3 Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

• If 24 VAC is present at the main control board, check the wiring between the main control board and the gas valve. Replace the wiring if necessary. Do not disconnect the wiring from the gas valve and attempt to measure voltage at that point. The main control board can detect if the gas valve is not connected and

Flame Lost

While Running

(cont’d)

(will require a

manual reset once the

condition has been

corrected. Press the

RESET button on the

display to reset.)

The unit was running and lost the flame signal. This condition occurred twice .

will display the Gas Valve / Connection fault.

• If 24 VAC is present, check the outlet of the valve to ensure the valve is flowing gas. With a manometer connected to the outlet tap of the gas valve, when the unit is in the prepurge period, there should be a negative pressure present. When the valve is energized a change in pressure should occur. If the pressure change does not occur, the gas valve is not opening. Replace the gas valve.

• Inspect flame sensor and associated wiring. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Inspect the burner. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Replace the main control board.

Manual Reset

High Limit

(will require a

manual reset once the

condition has been

corrected. Press the

RESET button on the

display to reset.)

The outlet water temperature has exceeded the setting of the high limit.

• Verify that the system is full of water and that all air has been properly purged from the system.

• Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for the proper piping methods for the SYNC.

• Check voltage to boiler pump motor on a call for heat. If voltage is not present, check wiring back to the pump relay.

• Replace the pump relay if necessary.

• If 120 VAC is present on a call for heat and the boiler pump is not operating, replace the pump.

• If the system pump is a variable speed pump, ensure that the system flow is not less than the boiler flow.

• If operating on either an inlet or system supply sensor, check temperature setting of the main control board.

• If the high limit has tripped, check setting of the device.

• Check resistance of water sensors and compare to Table 3B on page 45 of this manual. Replace sensor if necessary.

• Replace high limit.

49

Service Manual

3 Troubleshooting

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

Automatic Reset High Limit:

• Verify that the system is full of water and that all air has been properly purged from the system.

• Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for the proper piping methods for the SYNC.

• Check voltage to boiler pump motor on a call for heat. If voltage is not present, check wiring back to the pump relay.

• Replace the pump relay if necessary.

• If 120 VAC is present on a call for heat and the boiler pump is not operating, replace the pump.

Automatic Reset

High Limit / HEX-

Temp SW

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Either the auto-reset high limit (optional), or the O-temp heat exchanger switch as opened.

• If the system pump is a variable speed pump, ensure that the system flow is not less than the boiler flow.

• If operating on either an inlet or system supply sensor, check temperature setting of the main control board.

• If the high limit has tripped, check setting of the device.

• Check resistance of water sensors and compare to Table 3B on page 45 of this manual. Replace sensor if necessary.

• Replace high limit.

Blower RPM’s

Too Low

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

The actual fan rpm is 30% lower than what is being called for. Reference the Burners Screen information on page 32 of this manual.

Blown fuse.

HEX Temp SW:

• Check continuity across two contacts. Wires should be connected at both poles of normally closed switch.

• Inspect the rear of the inner combustion chamber at the burner level, for refractory breakdown/missing. Replace the refractory if no damage to the heat exchanger as a result of the burner, otherwise, replace the heat exchanger.

• Faulty O-temp heat exchanger switch. Replace switch.

• Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting of the SYNC Installation and Operation Manual for proper lengths.

• Check for obstruction or blockage in the vent/air intake pipes or at terminations.

• Check the wiring connections at the fan and at the main control board.

• Replace the fan.

• Replace the main control board.

• Replace fuse F4 on the control board, see page 43 of this manual.

50

Service Manual

3 Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

• Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting of the

Blower RPM’s

Too High

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

The actual fan rpm is 30% higher than what is being called for.

SYNC Installation and Operation Manual for proper lengths.

• Check for obstruction or blockage in the vent/air intake pipes or at terminations.

• Check the wiring connections at the fan and at the main control board.

• Replace the fan.

• Replace the main control board.

Sensor Open

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Sensor Shorted

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Flue Sensor

Open / Removed

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Flue Sensor

Shorted

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Either the inlet water or outlet water temperature sensor has been disconnected.

Either the inlet water or outlet water temperature sensor has been shorted.

The flue sensor has been disconnected or removed from the flue.

The flue sensor has been shorted.

• Check the sensors and their associated wiring. Repair or replace the sensor or wiring if damaged.

• Measure the resistance of the sensors and compare the resistance to the tables on page 45 of this manual.

• Replace the sensor if necessary.

• Check the sensors and their associated wiring. Repair or replace the sensor or wiring if damaged.

• Measure the resistance of the sensors and compare the resistance to the tables on page 45 of this manual.

• Replace the sensor if necessary.

• Check the sensor and its associated wiring. Repair or replace the sensor or wiring if damaged.

• Measure the resistance of the sensors and compare the resistance to the tables on page 45 of this manual.

• Replace the sensor in flue.

• Replace the sensor if necessary.

• Check the sensor and its associated wiring. Repair or replace the sensor or wiring if damaged.

• Measure the resistance of the sensors and compare the resistance to the tables on page 45 of this manual.

• Replace the sensor if necessary.

Louver Proving

Switch

(will require a manual

reset once the condition

has been corrected. Press

the RESET button on the

display to reset.)

Tank Open

An optional remote proving switch is not making.

Sensors equipped with an internal limit (such as the Lochinvar Squire® Indirect Tank), the limit has opened due to temperature (195°F) or the sensor has become disconnected.

• Check function of remote devices.

• Check for loose or misplaced jumper if proving switch is not installed.

• Check the tank temperature.

• Repair or replace the sensor wiring if damaged.

• Replace the sensor if necessary.

51

Service Manual

3 Troubleshooting

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

Air Flow Too

Low

(will require a manual

reset once the condition

has been corrected. Press the RESET button on the display to reset.)

Air pressure switch contacts are open.

Flap valve contacts are in an open position.

• Check the wiring connections to switch. Wires should be connected to the common and normally closed terminals.

• Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting of the SYNC Installation and Operation Manual for proper lengths.

• Check for obstruction or blockage in the vent/air intake pipes or at terminations.

• Check reference hoses connected to the air pressure switch for blockage or obstruction.

• Inspect the burner. Reference page 39 of this manual for removal and cleaning procedures. Replace if necessary.

• Inspect the heat exchanger. Reference page 40 of this manual for removal and cleaning procedures. Replace if necessary.

• Faulty air pressure switch. Replace switch.

• Check the wiring connections to the flap valve switch. Replace or repair wiring if necessary.

• Check for obstruction in the vent / air intake pipes or at terminations.

• Verify combustion air blower is operating. Replace if necessary.

Flap Valve

Stuck Open

Too Many

Resets - Try Later

Voltage Too

Low

Flap valve contacts are in a closed position.

Too many manual resets have occurred during a 15 minute period.

120 VAC input to the main control board has dropped below 80 VAC.

• Replace flap valve switch.

• Check wiring connections to the flap valve switch. Replace or repair wiring if necessary.

• Check flap valve for obstruction or blockage.

• Replace flap valve switch.

• Wait 15 minutes and try again.

• Turn power off to unit, wait 30 seconds and then turn power back on.

• Check 120 VAC supply to the transformer.

• Check wiring connections at the low voltage terminal strip.

• Check the wire size/length to remote devices.

• Replace the main control board.

52

Service Manual

3 Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT DESCRIPTION CORRECTIVE ACTION

Internal Fault

Writing to

Memos

CRC Parameters

No Error Stored

Flue Temp

Shutdown

Delta T

Shutdown

The main control board has detected an internal fault.

The stack temperature has exceeded the set parameters for the boiler.

The temperature rise across the heat exchanger has exceeded the set parameters for the boiler.

• Replace the main control board.

• Press the RESET button on the SMART TOUCH display panel.

• Inspect the heat exchanger. Reference page 40 of this manual for the procedure on how to clean the flue side of the heat exchanger.

• Inspect the flue sensor and associated wiring. Measure the resistance of the flue sensor and compare to Table 3C on page 45 of this manual. Replace the sensor if necessary.

• Verify that the vent/air intake pipes are properly installed and that there are no obstructions.

• Replace the main control board.

• Verify that the system is full of water and that all air has been properly purged from the system.

• Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for the proper piping methods for the SYNC boiler.

• Check for voltage to the boiler pump motor on a call for heat. If voltage is not present, check the wiring back to the pump relay. Replace the pump relay if necessary.

• If 120 VAC is present on a call for heat and the boiler pump is not operating, replace the pump.

• Verify that the boiler pump is set to the proper speed or that the pump is the proper size. Reference Section 6 - Hydronic Piping of the SYNC Boiler Installation and Operation Manual for boiler pump specifications.

Outlet Temp

Shutdown

Outlet water temperature has exceeded the maximum outlet water temperature.

• Verify that the system is full of water and that all air has been properly purged from the system.

• Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping of the SYNC Installation and Operation Manual for the proper piping methods for the SYNC boiler.

• Check for voltage to the boiler pump motor on a call for heat. If voltage is not present, check wiring back to the pump relay. Replace the pump relay if necessary.

• If 120 VAC is present on a call for heat and the boiler pump is not operating, replace the pump.

53

3 Troubleshooting

Service Manual

Combustion Analysis Procedure

1. Turn the main power off to the boiler by placing the “On/Off” switch in the OFF position.

2. Remove the flue temperature sensors from the flue pipe connections. Note: Combustion measurements will be made at this point.

3. Turn the main power on to the boiler by placing the “On/Off” switch in the ON position.

4. Navigate to the Service Mode Screen from the Status Screen by pressing the MAIN button and then the SERVICE MODE button.

5. On the Service Screen place Heat Exchanger 1 into

operation by selecting Heat Exchanger 1 with the SELECT button and turning the heat exchanger on by pressing the ON/OFF button (OFF indicates that the heat exchanger is off and ON indicates that the heat exchanger should be firing).

6. Insert the probe from a combustion analyzer into the

hole left by the removal of the flue temperature sensor.

Note: Heat Exchanger 1 is the top heat exchanger; please

ensure the probe is in the top flue sensor location.

7. Once the heat exchanger has modulated up to full fire

measure the combustion. The values should be in the range listed in Table 3H above. CO levels should be less than 200 ppm for a properly installed unit. If the combustion is not within range reference the chart below for possible causes and corrective actions.

Table 3H Flue Products

Natural Gas Propane

CO

2

8.0% - 10% 3.0% - 6.5% 9.0% - 11% 4.1% - 6.9%

O

2

CO

2

O

2

8. Once the Heat Exchanger 1 analysis is complete, test the safety shutoff device by turning the manual shutoff valve to the OFF position and ensuring that Heat Exchanger 1 shuts down and registers an alarm. Open the manual shutoff valve, reset the control, and return to Service Mode.

9. Repeat the same procedure for Heat Exchanger 2 by selecting Heat Exchanger 2 while on the Service Mode Screen. Be certain to insert the probe from the combustion analyzer into the Heat Exchanger 2 flue temperature sensor location.

10. Turn the main power off to the boiler and replace the flue temperature sensor into the flue pipe connection.

11. Place the boiler back into normal operation.

 WARNING

You must replace the flue gas temperature sensor to prevent flue gas spillage into the room. Failure to comply could result in severe personal injury, death, or substantial property damage.

Table 3G Troubleshooting Chart - Combustion Levels

POSSIBLE CAUSE CORRECTIVE ACTION

• Refer to Section 2 - General Venting of the SYNC Installation and Operation Manual

Vent/Air Intake Length

for the proper venting and air intake methods for the SYNC boiler.

or Obstruction

• Check for obstructions at the vent/air intake terminals.

Gas Supply Pressure

• Refer to Section 6 - Gas Connections of the SYNC Installation and Operation Manual for the proper gas supply for the SYNC boiler.

• Refer to page 39 of this manual for burner removal and cleaning procedures.

Dirty/Damaged Burner

• Replace burner if necessary.

Gas Valve Adjustment

• Refer to page 55 of this manual for the gas valve adjustment procedure.

54

3 Troubleshooting (continued)

Service Manual

Gas valve adjustment procedure

If adjustment of the gas valve is deemed necessary, use the following procedures: (Note: The procedures below are model specific.)

CAUTION

Model 1.0

Locate the throttle adjustment screw on top of the gas valve, see FIG. 3-2. Using a screwdriver, turn the screw a 1/4 turn

counterclockwise to increase CO2 levels or a 1/4 turn clockwise to decrease CO2 levels. After one adjustment on

the valve, follow the Combustion Analysis Procedure on page 54 of this manual to measure the combustion.

If combustion is still not within the specified range, repeat the procedure. This procedure SHOULD NOT be performed more than four (4) times. If after four (4) adjustments and the combustion is still not within the specified range, revisit the possible causes in Table 3G on page 54 or replace the gas valve.

Under normal operating conditions this valve should not need adjusting.

Models 1.3 - 1.5

Locate the throttle adjustment screw on top of the gas valve, see FIG. 3-3. Using an Allen wrench, turn the screw a 1/4 turn counterclockwise to increase CO clockwise to decrease CO2 levels. After one adjustment on the valve, follow the Combustion Analysis Procedure on page 54 of this manual to measure the combustion.

If combustion is still not within the specified range, repeat the procedure. This procedure SHOULD NOT be performed more than four (4) times. If after four (4) adjustments and the combustion is still not within the specified range, revisit the possible causes in Table 3G on page 54 or replace the gas valve.

Figure 3-3 Gas Valve Adjustment: Models 1.3 - 1.5

levels or a 1/4 turn

2

Figure 3-2 Gas Valve Adjustment: Model 1.0

THROTTLE ADJUSTMENT SCREW

THROTTLE ADJUSTMENT

SCREW (REMOVE BLUE COVER)

55

Revision Notes: Revision A (ECO #C02428) initial release.

Revision B (ECO #C03046) reflects changes made to the History, Details, and Graphs screen shots (pgs. 15, 33 and 34).

Revision C (ECO #CO2918) reflects the addition of Tank Sensor Open on page 50.

Revision D (ECO #C04062) reflects changes to the terminology in all SYNC manuals and labels from module to heat exchanger (exception: control module), edits made to the ceramic fiber material warning, removal of the stabilitor from FIG. 2-2 (C04057) along with the addition of the Low Water Flow Test Procedure (R02559).

Revision E (ECO #C04560) reflects the addition of Modbus to the manual and a new heat exchanger cleaning procedure.

Revision F (ECO #C06388) reflects the correction of “Manual Reset High Limit” instructions on page 15.

Revision G (ECO C07981) reflects the addition of the O-temp switch (Table 3F) and edits made to the Inputs diagram on page 7.

SYNC-SER Rev G

5/11

Lochinvar SYNC 1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual