Lochinvar FTxl 400 User manual

Service Manual

Models: 400, 500, 600, 725, & 850

This manual must only be used

by a qualified heating installer

/ service technician. Read all

instructions, including this

manual and the FTXL 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.

 WARNING

Save this manual for future reference.

FTXL-SER_100059362_2000005003_Rev G

2

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.

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

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

PLEASE READ BEFORE PROCEEDING ........................ 3

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

When servicing boiler ................................................... 4

Boiler operation ............................................................ 4

Boiler water ................................................................... 4

Freeze protection fluids ................................................ 4

WHAT IS IN THIS MANUAL .............................................. 5

1. SERVICE

Near Boiler Piping .............................................................. 6

The FTXL Display .............................................................. 7

Control Inputs ............................................................... 8

Control Outputs ............................................................. 9

General Operation ...................................................... 10

Sequence of Operation ............................................... 11-12

Display Panel Menu Access ............................................ 13

Display Panel Parameter Access ................................ 14-15

Parameter Table.......................................................... 16-19

Viewable and Changeable Control Parameters .......... 20-30

2. MAINTENANCE

Maintenance and Annual Startup ................................ 31-36

3. TROUBLESHOOTING

Before Troubleshooting .................................................... 37

Check Control Module Fuses .......................................... 37

Table 3-1 - Troubleshooting Chart - No Display .............. 38

Checking Temperature Sensors ...................................... 39

Table 3-3 - Troubleshooting Chart - Noisy System ......... 40

Table 3-4 - Troubleshooting Chart - Fault Messages . 41-47

Combustion Analysis Procedure ................................. 47-48

Table 3-5 - Flue Products ................................................ 48

Table 3-6 - Troubleshooting Chart - Combustion Levels 48

Gas Valve Adjustment Procedure .................................... 49

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

Contents

Service Manual

Please read before proceeding

Installer – Read all instructions, including

this manual and the FTXL 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 FTXL User’s

Information Manual for your reference.

Have this boiler serviced/inspected by

a qualified service technician at least

annually.

Failure to comply with the above could

result in severe personal injury, death or

substantial property damage.

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 FTXL

Installation and Operation Manual).

Any claims for damage or shortage in

shipment must be filed immediately

against the transportation company by the

consignee.

3

Handling ceramic fiber materials

REMOVAL OF COMBUSTION CHAMBER LINING

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 inhaled 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.

NIOSH stated First Aid.

 Eye: Irrigate immediately.

 Breathing: Fresh air.

 WARNING

NOTICE

 WARNING

4

Please read before proceeding

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.

Service Manual

5

What is in this manual?

Service

Near boiler piping

• Typical system components

The FTXL display

• Display panel 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 -- Domestic Hot Water

(DHW)/space heating

Control panel menu access

• Accessing programming mode and locating menus

(See separate guide covering the interface.)

Control panel parameter access

• Accessing and changing parameters from the display panel

Quick start information -- parameter

table

• An index of available adjustments and readouts, where to

access them and where to find detailed information.

FTXL parameters

• General

• Temperature Setting

• Data Logging

• Functions

• DHW Settings

• Outdoor Reset

• Anti-cycling

• Control Modes

• Building Management System (BMS)

• Circulation Pumps

• Service Notification

• Basic Setup

• USB

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

• 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

6

IMG00996

F

R

O

M

T

O

FROM

SYSTEM

TO

SYSTEM

SYSTEM PUMP

SYSTEM SUPPLY SENSOR

DIRT SEPARATOR

Y-STRAINER

(RECOMMENDED)

BOILER PUMP

INDIRECT

DOMESTIC

HOT WATER

TANK

TO DRAIN

Near boiler piping

This piping reference is included to specify the Near Boiler Piping specific to the FTXL. This piping scheme is important for

proper operation of the SMART SYSTEM control. See the FTXL Installation and Operation Manual for more detailed piping

diagrams.

Service Manual

7

1 Service (continued)

IMG01093

USB

DRIVE

PC

CONNECTION

NAVIGATION

DIAL

LEFT

SELECT KEY

RESET

SWITCH

RIGHT

SELECT KE

Y

The FTXL display

The information on the bottom of the display shows the functions of the two SELECT keys (on either corner), and the

NAVIGATION dial (in the center):

MENU = Left SELECT Key

SETPOINTS = NAVIGATION Dial - Pressing Down

SHDN = Right SELECT Key

Service Manual

1 Service

8

1 Service

GAS PRESSURE SWITCH

DHW THERMOSTAT

ROOM THERMOSTAT /

ZONE CONTROL

FLOW SWITCH

SYSTEM SUPPLY SENSOR

OUTDOOR SENSOR

SEQUENCER / BUILDING

MANAGMENT SYSTEM

LOW VOLTAGE

CONNECTION

BOARD

INLET TEMPERATURE

SENSOR

OUTLET TEMPERATURE /

HI-LIMIT SENSOR

FLUE GAS SENSOR

LOUVER PROVING SWITCH

FLAME SENSOR

LOW WATER CUTOFF

BLOCKED DRAIN SWITCH

DISPLAY PANEL

SMART CONTROL

MODULE

SYSTEM PUMP SPEED CONTROL

IMG00006

DHW RECIRCULATION SENSOR

USB 1

USB 2

Reset

DHW RECIRCULATION SENSOR

Control inputs

Service Manual

1 Service

9

1 Service (continued)

LOW VOLTAGE

CONNECTION

BOARD

SMART CONTROL

MODULE

ALARM BELL

LOUVER RELAY

RUN TIME CONTACTS

BUILDING MANAGEMENT

SYSTEM

BOILER PUMP

SYSTEM PUMP

DHW PUMP

IGNITOR

BLOWER

GAS VALVE

DISPLAY PANEL

DHW RECIRCULATION

PUMP RELAY

USB 1

USB 2

Reset

FLUE DAMPER RELAY

BACKFLOW PREVENTER

Control outputs

Service Manual

1 Service

10

1 Service

General Operation

How the boiler operates

The FTXL uses an advanced stainless steel heat exchanger

and an electronic control module that allows fully

condensing operation. The blower pulls in gas and air and

pushes flue products out of the boiler through the heat

exchanger and flue piping. The control module regulates

blower speed to control boiler firing rate. The gas valve

senses the amount of air flowing into the boiler and allows

only the right amount of gas to flow.

How the control module operates

The FTXL control module receives input from boiler

sensors. The control module activates and controls the

blower and gas valve to regulate heat input and switches

boiler, DHW, DHW recirculation, and system pumps on

and off as needed. The user/installer programs the module

to meet system needs by adjusting control parameters.

These parameters set operating temperatures and boiler

operating modes. Boiler operation can be based on boiler

outlet water temperature, boiler return water temperature

or system supply temperature, depending on the parameter

setting.

Sequence of operation

Table 1-1 shows control module normal sequences of

operation for space heating and DHW operation. The

combined operation sequence is for a typical application,

programmed to provide DHW priority.

Access modes

User

The user can adjust space heating and tank target temperatures

by pressing the NAVIGATION dial when “SETPOINTS” is

flashing at the bottom of the display. The date and time, and

the temperature units can also be changed.

Installer

Most parameters are available only to the installer, accessible

by entering the installer password (5309).

Saving parameters (reference the Parameter Table -

Table 1-4 on pages 16 - 19 of this manual)

Please note that the brackets ([]) denote

screen status.

NOTICE

To save parameters and exit programming:

Press the RIGHT SELECT [SAVE] key and then press the

RIGHT SELECT [HOME] key.

To enter a parameter and continue programming:

Press the RIGHT SELECT [SAVE] key 1 time to return to the

parameter listings; press again to return to the menu listings.

Remember to press the RIGHT SELECT [HOME] key when

finished programming in order to save the changes made.

Service Manual

1 Service (continued)

Table 1-1 Sequence of Operation

OPERATION DISPLAY

1. Upon a call for heat, the gas pressure switch(es) must be closed.

2. Once the gas pressure switch(es) are closed, the control turns

on the appropriate pumps (system and boiler pumps for space

heating, DHW pump for DHW). The flow switch and/or LWCO

must close.

3. The control turns on power to the louver relay. The louver

proving switch, and blocked drain switch must close.

4. The control starts a prepurge cycle by starting the blower.

5. The control starts a trial for ignition by firing the spark

electrode and opening the gas valve.

6. If flame is not detected after the sparking ends, the control will

perform a postpurge, then start another prepurge cycle and try

to light the burner again. On the 500 and larger models, the control

will lock out if this second attempt also fails. On the 400 model,

the control will perform a total of 4 attempts before locking out.

11

Service Manual

1 Service

12

Table 1-1 (continued from previous page) Sequence of Operation

OPERATION DISPLAY

7. If flame is detected, it holds the firing rate steady for a few

seconds to let the flame stabilize, then it begins to modulate the

firing rate based on a set point or some other command (such

as a 0-10V BMS signal).

a

8. If the space heating call for heat is active, and the tank thermostat

or sensor starts a DHW call for heat, the boiler will switch to the

DHW mode. If programmed for normal DHW operation (not as

a zone), the DHW pump will turn on first, then the boiler pump

will turn off (boiler and DHW pump operation briefly overlap to

ensure flow is maintained through the unit). This will divert the

boiler’s outlet water from the heating system and send it to the

tank coil instead. The control will then modulate to maintain the

outlet temperature to the DHW boiler set point.

9. If the boiler is not part of a Cascade, and both the space heating

and DHW calls for heat remain active long enough, the boiler will

switch back and forth between the two heating modes until one

of them is satisfied.

10. Once both calls for heat are satisfied, the control will turn off

the burner. The blower will continue to run during the postpurge

period.

11. Any pumps that are running will continue to run for their

respective pump delay times before turning off, unless

programmed to remain on continuously. A 60 second anti-cycle

period will start, which will delay any new call for heat until it

times out.

12. In Standby, ready to start a new cycle.

Service Manual

1 Service

13

1 Service (continued)

Display panel menu access

Table 1-2 Use this procedure to access menus from the display panel

BUTTON

SCREEN

STATUS

OPERATION DISPLAY

[MENU]

Press and hold the LEFT SELECT soft key [MENU]

for five (5) seconds.

Rotate the NAVIGATION dial clockwise until 5 is

displayed (first digit on the left).

Press the NAVIGATION dial to select the next digit.

Rotate the NAVIGATION dial clockwise until 3 is

shown in the display.

Press the NAVIGATION dial 2 times to move to the last

digit. Rotate the NAVIGATION dial counterclockwise

until 9 is displayed.

[SAVE] Press the RIGHT SELECT soft key [SAVE].

Service Manual

1 Service

14

1 Service

Display panel parameter access

Table 1-3 This is a typical example of accessing a parameter, shown for parameter Temperature Settings, MIN

SH Setpt

BUTTON

SCREEN

STATUS

OPERATION DISPLAY

This example shows how to access parameter Temperature Settings. The first display shown is at the beginning

of the menu listings, after entering the installer access code.

Rotate the NAVIGATION dial counterclockwise until

the arrow (>) is next to TEMPERATURE SETTINGS.

Press the NAVIGATION dial one time.

Rotate the NAVIGATION dial counterclockwise until

the arrow (>) is next to MIN SETPT.

Press the NAVIGATION dial one time.

Rotate the NAVIGATION dial to the desired

temperature.

Service Manual

15

1 Service (continued)

Display panel parameter access (cont.)

Table 1-3 This is a typical example of accessing a parameter, shown for parameter Temperature Settings, MIN

SH Setpt

BUTTON

SCREEN

STATUS

OPERATION DISPLAY

This example shows how to access parameter Temperature Settings. The first display shown is at the beginning

of the menu listings, after entering the installer access code.

[SAVE]

Press the RIGHT SELECT soft key [SAVE] one time.

[EXIT]

Press the LEFT SELECT soft key [EXIT] if all

desired changes have been made.

[HOME]

Press the LEFT SELECT soft key [HOME].

Wait for the new settings to be saved.

1 Service

16

1 Service

Parameter table

Table 1-4 This table lists SMART SYSTEM control module parameters and where to access them

Menu Description

See

Page

User Access

Installer

Access

Vacation Mode (On/Off) 20 Yes Yes

Time and Date 20 Yes Yes

Software Version (read only) 20 No Yes

Temperature Units (ºC/ºF) 20 Yes Yes

SH Night Setback Offset

IF SH NSB > 0:

i. SH Night Setback On Times

ii. SH Night Setback Off Times

20 No Yes

DHW Night Setback Offset

IF DHW NSB > 0:

i. DHW Night Setback On Times

ii. DHW Night Setback Off Times

21 No Yes

Display Timeout 21 No Yes

Display Contrast 21 Yes Yes

SH1 Set Point User 21 Yes Yes

Minimum SH Set Point 21 No Yes

Maximum SH Set Point 21 No Yes

Offset SH1 Set Point 21 No Yes

Differential SH1 Set Point 21 No Yes

SH2 Set Point User 21 Yes Yes

Offset SH2 Set Point 21 No Yes

Differential SH2 Set Point 21 No Yes

SH3 Set Point User 21 Yes Yes

Offset SH3 Set Point 21 No Yes

Differential SH3 Set Point 21 No Yes

3-Way Valve Time 21 No Yes

Reset Last 10 Errors 21 No Yes

Service Mode Delay 22 No Yes

Freeze Protection Pump On 22 No Yes

Freeze Protection Burner On 22 No Yes

Freeze Protection Burner Differential 22 No Yes

Tank Set Point 22 Yes Yes

Tank Set Point Differential 22 No Yes

DHW Boiler Set Point 22 No Yes

Boiler Set Point Offset 22 No Yes

Boiler Set Point Differential 22 No Yes

DHW Recirc Pump Offset 22 No Yes

DHW Recirc Pump Differential 22 No Yes

GENERAL

TEMPERATURE SETTINGS

DATA

LOGGING

FUNCTIONS

DHW SETTINGS

Service Manual

1 Service

17

1 Service (continued)

Parameter table

Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where

to access them

Menu Description

See

Page

User Access

Installer

Access

Tank Minimum Set Point 23 No Yes

Tank Maximum Set Point 23 No Yes

DHW Max Rate 23 No Yes

DHW Type (normal, zone)

i. SH/DHW Switching Time

ii. DHW/SH Switching Time

ELSE:

i. DHW FORCES SYSP (YES/NO)

ii. DHW BLOCKS SYSP (YES/NO)

23 No Yes

IF Outdoor Sensor Connected:

Low Outdoor Temperature 1 23 No Yes

High Outdoor Temperature 1 23 No Yes

SH1 Set Point at Low Outdoor Temp 24 No Yes

SH1 Set Point at High Outdoor Temp 24 No Yes

Outdoor Shutdown Temp 1 24 No Yes

Outdoor Shutdown Differential 1 24 No Yes

Shift Heat Curve 1 24 No Yes

Low Outdoor Temperature 2 24 No Yes

High Outdoor Temperature 2 24 No Yes

SH2 Set Point at Low Outdoor Temp 24 No Yes

SH2 Set Point at High Outdoor Temp 24 No Yes

Outdoor Shutdown Temp 2 24 No Yes

Outdoor Shutdown Differential 1 24 No Yes

Shift Heat Curve 2 24 No Yes

Low Outdoor Temperature 3 24 No Yes

High Outdoor Temperature 3 24 No Yes

SH3 Set Point at Low Outdoor Temp 24 No Yes

SH3 Set Point at High Outdoor Temp 24 No Yes

Outdoor Shutdown Temp 3 24 No Yes

Shift Heat Curve 3 24 No Yes

Boost Temperature

IF Boost Temperature > 0

i. Boost Time

25 No Yes

Service Manual

OUTDOOR RESET

DHW SETTINGS (CONT.)

1 Service

18

Parameter table

Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where

to access them

Menu Description

See

Page

User Access

Installer

Access

Anti-cycling Time 25 No Yes

Anti-cycling Override Differential 25 No Yes

Ramp Delay (Enable/Disable) 25 No Yes

Modulation Factor 25 No Yes

Controlling Sensor(Outlet/System Supply/Inlet) 26 No Yes

Cascade Address

IF Address = 0:

Maximum Cascade Outlet Set Point

Cascade Offset

Cascade Differential

Cascade Type (L/L, EFF)

Minimum On/Off Time

Minimum Next On Time

Minimum Pumps On

ELSE IF Address = 1:

Alternate Leader? (Y/N)

IF Yes:

Maximum Cascade Outlet Set Point

Cascade Offset

Cascade Differential

Cascade Type (L/L, Eff)

Minimum On/Off Time

Minimum Next On Time

Minimum Pumps On

26 No Yes

Boiler Size

i. Cascade Address

ii. Type

iii. Input

27 No Yes

BMS (Active, Inactive)

IF Active:

i. BMS Type (Power, Set Point)

IF Power:

1. Power at Minimum Volts

2. Power at Maximum Volts

ELSE:

1. Set Point at Minimum Volts

2. Set Point at Maximum Volts

ii. Minimum Volts

iii. Maximum Volts

iv. TStat Input (Active, Inactive)

IF Inactive:

1. On Volts

2. Off Differential Volts

28 No Yes

ModBus/BACNet (Active, Inactive)

IF Active:

i. BAS Timeout

28 No Yes

ANTI-CYCLING

CONTROL MODES

Service Manual

BMS

1 Service (continued)

19

Parameter table

Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where

to access them

Menu Description

See

Page

User Access

Installer

Access

System Pump Delay 29 No Yes

Boiler Pump Delay 29 No Yes

DHW Pump Delay 29 No Yes

System Pump Anti-Seize Delay 29 No Yes

Boiler Pump Anti-Seize Delay 29 No Yes

DHW Pump Anti-Seize Delay 29 No Yes

System Pump Type (CFH, WWSD) 29 No Yes

Boiler Pump Delta T Set Point 29 No Yes

Boiler Pump Minimum Volts 29 No Yes

Service Notification Months 29 No Yes

Service Notification Running Time 29 No Yes

Service Notification Cycles 29 No Yes

Reset Service Reminder 30 No Yes

Installer Name 30 No Yes

Installer Phone Number 30 No Yes

Time & Date 30 No Yes

IF Outdoor Sensor Connected:

i. Low Outdoor Temperature 1

ii. High Outdoor Temperature 1

iii. SH1 Set Point at Low Outdoor Temperature

iv. SH1 Set Point at High Outdoor Temperature

v. Outdoor Shutdown Temperature

vi. Outdoor Shutdown Differential 1

30 No Yes

Cascade Address

IF Address = 0:

i. Maximum Cascade Set Point

ii. Cascade Offset

iii. Cascade Differential

iv. Cascade Type (L/L, EFF)

30 No Yes

BMS (Active, Inactive)

IF Active:

i. BMS Type (Power, Set Point)

IF Power:

1. Power at Minimum Volts

2. Power at Maximum Volts

ELSE:

1. Set Point at Minimum Volts

2. Set Point at Maximum Volts

ii. Minimum Volts

iii. Maximum Volts

iv. TStat Input (Active, Inactive)

IF Inactive:

1. On Volts

2. Off Differential Volts

30 No Yes

Service Manual

CIRCULATION PUMPS

SERVICE

BASIC SETUP

USB

N

OTIFICATION

1 Service

Viewable and changeable control parameters

General

Vacation Mode

This parameter forces the Space Heating (SH) and DHW set

points to decrease by the amounts programmed in the Night

Setback Offset parameters. It is used to save energy, such

as when the building is unoccupied for an extended period

of time. For this function to work, the Space Heating Night

Setback Offset and/or DHW Night Setback Offset parameters

must be set to a value higher than 0°. The default value of this

parameter is OFF.

Time and Date

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

anytime the boiler has been powered off for more than four (4)

hours. This parameter must be accessed to set the clock.

The clock is automatically updated whenever a PC is connected

and the Win_Pro-Installer program is started.

Software Version

The software version allows the user to view the software

version in use by the control. This software controls the

operation of the boiler. When a new software version becomes

available, the existing control can be replaced with a new

control to update the software.

Software version is read only.

Temperature units (°C / °F)

The control can be configured to display temperature in either

°C or °F. This parameter can be changed by the user or the

installer by accessing the Temperature Units parameter. The

default is °F.

Space Heating (SH) and Domestic Hot Water (DHW)

Night Setback Offset

Once the unit’s internal clock has been set correctly, the Night

Setback feature can be used to program a lower set point

during unoccupied times. Both the space heating and DHW

can be programmed for night setback. When in night setback,

the control reduces the set point by a fixed amount. For space

heating, it subtracts the space heating night setback offset

from each of the SH user set points (SH1, 2, and 3 Set point

parameters), or the calculated outdoor reset set point (if lower).

For DHW, it subtracts the DHW night setback offset from the

tank set point (Tank Set point parameter).

NOTE: The DHW night setback will not work without a tank

sensor installed.

The installer may adjust the space heating night setback offset

by accessing the SH Night Setback Offset parameter and the

DHW night setback offset by accessing the DHW Night Setback

Offset parameter. The minimum setting is 0°F (0°C) and the

maximum setting is 90°F (50°C).

Space Heating (SH) and Domestic Hot Water (DHW)

Night Setback On and Off Times

These are the times at which the SH Night Setback and DHW

Night Setback Offsets become active and inactive. There are

seven (7) stop times and seven (7) start times each for the SH

and DHW night setback functions. Any start or stop time may

be set to any time during the week. When a start time and a

stop time are programmed for the same day and time, the stop

time has priority (this is how a start time can be disabled).

The installer can adjust the SH Night Setback start and stop

times by accessing the parameter SH NSB On/Off Times. The

installer can access the DHW Night Setback start and stop times

by accessing the DHW NSB On/Off Times parameter. These

settings can be adjusted as follows:

1. When the screen is first accessed, start and stop triggers 1 are

displayed. If a different trigger number is desired, rotate the

NAVIGATION dial until the desired trigger number appears.

Once it is found, press the NAVIGATION dial to adjust the

start and stop times. The day of the week for the start time

will flash.

2. Rotate the NAVIGATION dial to adjust the day of the week

of the start trigger. Once it is set to the desired day of the

week, press the NAVIGATION dial again. The start time

hour will flash.

3. Rotate the NAVIGATION dial to adjust the start time hour

to the desired time. Press the NAVIGATION dial again.

The start time minutes will flash.

4. This process may be continued until the start and stop days

and times are adjusted as desired. When finished with this

set of triggers, press the [SAVE] key.

5. Rotate the NAVIGATION dial to select another set of

start and stop triggers, or press the [EXIT] key to return to

the previous menu.

CAUTION

Before changing parameters, note the

settings so that the unit can be returned to

its original operating parameters.

NOTICE

The internal clock does not adjust for

Daylight Savings Time and therefore, will

require a manual adjustment.

Service Manual

20

Page is loading ...

Lochinvar FTxl 400 User manual

This manual is also suitable for

Lochinvar FTxl 400 User manual

Related papers

Other documents