Lochinvar 1.0 User Manual

SYNC-SER Rev H

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.

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.

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

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

1 Service

The SYNC display

Service Manual

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

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

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.

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,

HW pump relay output for a HW call).

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

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

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

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,

and opens the gas valve.

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.

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

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

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.

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.

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).

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.

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.

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.

+ 39 hidden pages