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 Rev B
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
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
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
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
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