Slant/Fin SF-10 Guide

MODEL SF-10 CONTROL
Publication No. SF-10-40
Printed in Canada 0509
Part No. 470899000
OPERATION AND INSTRUCTION MANUAL
The SF-10 Boiler Temperature Control (BTC) is an efficient boiler operator with a digital LCD display
with backlight, a boiler pump output, and an alarm. The control regulates the boiler based upon set-
point, outdoor reset with domestic hot water heating priority, and several options for external boiler
control.
Features:
• Setpoint Operation
• Outdoor Reset with DHW Priority
• External Control through BMS Signal
• External Control through tekmar
Boiler Controls
• Boiler Pump Operation and Purge
• DHW Pump and Purge
• DHW Priority
• Parallel Piping
• Primary - Secondary Piping
• Display Backlight

Table of Contents..............................................................2
User Interface....................................................................2
Display ..............................................................................3
Symbol Description ........................................................3
Sequence of Operation ..................................................4
Section A: General ..............................................4
Section B: Setpoint ..............................................8
Section C: Outdoor Reset ....................................9
Section D: External Temperature Target ............10
Section E: External Direct Drive ........................11
Section F: Indirect Domestic Hot Water ............11
Installation ......................................................................13
Alarm Signal ..................................................................14
Testing ............................................................................15
Control (DIP Switch) Settings ........................................17
Mode 1 and 2 Setpoint & DHW Operation
Applications ........................................................18
View Menu ..........................................................19
Adjust Menu .....................................................20
Mode 3 and 4 Outdoor Reset & DHW Operation
Applications ........................................................21
View Menu ..........................................................22
Adjust Menu........................................................23
Default Settings ..................................................23
Mode 5 and 6 External Target Temperature
Applications .......................................................25
View Menu ..........................................................26
Adjust Menu........................................................27
Mode 7 External Direct Drive Operation
Applications ........................................................29
View Menu ..........................................................29
Adjust Menu........................................................30
Reload Factory Defaults ................................................30
Error Messages ............................................................31
Technical Data ..............................................................32
2 Model SF-10 Control Instructions Manual
Table of Contents
User Interface
The BTC uses a Liquid Crystal Display (LCD) as a method of supplying information. You use the LCD in order to setup and
monitor the operation of your system. The BTC uses three push buttons (Item ,) for selecting and adjusting settings. As
you program your control, record your settings in the settings column of the Adjust menu. The table is found in the second
half of this brochure.
MENU
All of the items displayed by the control are organized into two menus:
1) View
2) Adjust
These menus are listed on the upper right hand side of the display (Menu Field). The
default menu for the BTC is the View menu. While in the View menu, the VIEW segment
is displayed.
To select the Adjust menu, press and hold simultaneously all three buttons (Item ,)
for 1 second.
The display then advances to the Adjust menu and the ADJUST segment is turned on in
the display. The display will automatically revert back to the View menu after 20 seconds
of keypad inactivity. Once in a menu, there will be a group of items that can be viewed
within that menu.
ITEM
The abbreviated name of the selected item will be displayed in the item field of the display.
To view the next available item, press and release the Item button.
Once you have reached the last available item in a menu, pressing and releasing the Item
button will return the display to the first item in the selected menu.
ADJUST
To make an adjustment to a setting in the control, begin by selecting the Adjust menu
by pressing and holding simultaneously all three buttons.
Then select the desired item using the Item button. Finally, use the or button to
make the adjustment.
STATUS FIELD
Additional information can be gained by observing the Status field of the LCD. The status field will indicate which of the
control’s outputs are currently active. Symbols in the status field are only visible when the View menu is selected.
Item
Item
Item

Model SF-10 Control Instructions Manual 3
Display
Symbol Description
BOILER PUMP
Displays when the boiler pump is in operation.
HEAT DEMAND
Displays when a heat demand is present.
DHW PUMP
Displays when the DHW pump is in
operation.
DHW DEMAND
Displays when a DHW demand is present.
BURNER
Displays when the stage 1 or 2 contact is on.
ERROR
Displays when an error message is present.
WWSD
Displays when the control is in Warm Weather
Shut Down.
POINTERS
Displays the operation as indicated by the
text.
Note: Stage 2 contact is not used in this application.
External Input
Signal
Item
Oset

4 Model SF-10 Control Instructions Manual
Sequence of Operation
Section A: General
Section A
General
Operation
Page 4 - 8
Section B
Setpoint
Operation
Page 8
Section C
Outdoor Reset
Operation
Page 9
Section D
External Temp.
Target Input
Page 10
Section E
External Direct
Drive Operation
Page 11
Section F
Indirect DHW
Operation
Page 11 - 12
POWERING UP THE CONTROL
When the control is powered up, the control turns on all segments in the display for 2 seconds. Next, the software version is
displayed for 2 seconds. Last, the control enters into the normal operating mode.
DISPLAY BACKLIGHT
The control’s display has a backlight that is permanently on while the control is powered.
PIPING
The boiler can be piped in parallel or in primary / secondary to the system. The type of piping chosen affects the location of
the control’s operating temperature sensor. The control can either use the boiler outlet sensor or the boiler supply sensor.
MODES 1
(Setpoint and DHW Operation with Parallel Piping)
Mode 1 is designed for setpoint and domestic hot water (DHW) operation
using parallel piping. Once a heat demand signal is present, the
control operates the boiler burner to maintain the boiler target at the boil-
er outlet sensor. Refer to section B for a description of setpoint operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler outlet sensor. If both a heat demand
and a DHW demand are present at the same time, the control targets the
higher of the two requirements. Refer to section F for a description of indi-
rect domestic hot water operation.
PARALLEL PIPING
In parallel piping applications, the boiler outlet temperature is typically the same as that
delivered to the system. Therefore the operating temperature sensor is the boiler outlet sensor.
PRIMARY / SECONDARY PIPING
In primary / secondary applications, the boiler outlet temperature (primary loop) is
typically hotter than the system supply temperature (secondary loop). This occurs when the
system supply pipe has a larger flow rate than the boiler outlet pipe. Therefore, the
control requires an additional sensor (boiler supply) to measure the temperature delivered out
to the system. The operating temperature sensor is the boiler supply sensor.
MODES OF OPERATION (MODE)
The control allows for seven modes of operation in order to define the control operation and piping arrangement used.
The piping arrangement can be categorized into parallel and primary / secondary. The mode of operation is selected using the
MODE item in the Adjust menu. The temperature being controlled out to the heating system is measured by the operating sensor.
The piping arrangement determines which sensor the control uses as the operating sensor. The operating sensor is either the boil-
er outlet sensor or the boiler supply sensor.
Boiler
Outlet
Sensor
Boiler
Inlet
Sensor
Boiler
Supply
Sensor
Boiler
Outlet
Sensor
Boiler
Inlet
Sensor
BTC
Boiler
Outlet
Sensor
DHW Tank
Boiler Inlet Sensor

MODE 2
(Setpoint and DHW Operation with Primary / Secondary Piping)
Mode 2 is designed for setpoint and domestic hot water (DHW) operation
using primary / secondary piping. Once a heat demand signal is present,
the control operates the boiler burner to maintain the boiler target at the
boiler supply sensor. Refer to section B for a description of setpoint
operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler supply sensor. If both a heat
demand and a DHW demand are present at the same time, the control
targets the higher of the two requirements. Refer to section F for a
description of indirect domestic hot water operation.
MODE 3
(Outdoor Reset and DHW Operation with Parallel Piping)
Mode 3 is designed for outdoor reset and domestic hot water (DHW)
operation using parallel piping. Once a heat demand is present, the
control operates the boiler burner to maintain the calculated outdoor reset
target at the boiler outlet sensor. Refer to section C for a description of
outdoor reset operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler outlet sensor. If both a heat demand
and a DHW demand are present at the same time, the control targets the
higher of the two requirements. Refer to section F for a description of indi-
rect domestic hot water operation.
MODE 4
(Outdoor Reset and DHW Operation with Primary / Secondary Piping)
Mode 4 is designed for outdoor reset and domestic hot water (DHW)
operation using primary / secondary piping. Once a heat demand is
present, the control operates the boiler burner to maintain the calculated
outdoor reset target at the boiler supply sensor. Refer to section C for a
description of outdoor reset operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler supply sensor. If both a heat
demand and a DHW demand are present at the same time, the control
targets the higher of the two requirements. Refer to section F for a
description of indirect domestic hot water operation.
MODE 5
(External Target Temperature Input and DHW Operation–Parallel Piping)
Mode 5 is designed for an external input signal and domestic hot water
(DHW) with parallel piping. The external input signal can be provided from
a BMS, an EMS, or a tekmar tN4 System Control. The external input
signal creates an internal demand and changes the boiler target accord-
ing to a linear scale. The control operates the boiler burner to maintain the
boiler target at the boiler outlet sensor. Refer to section D for a description
of external target temperature operation.
Once a DHW demand is present, the control operates the boiler burner to
maintain the DHW target at the boiler outlet sensor. If both a heat demand
and a DHW demand are present at the same time, the control targets the
higher of the two requirements. Refer to section F for a description of indi-
rect domestic hot water operation.
Model SF-10 Control Instructions Manual 5
Boiler
Outlet
Sensor
Boiler
Supply
Sensor
DHW Tank
Boiler Inlet Sensor
BTC
BTC
Outdoor
Sensor
Boiler Inlet Sensor
Boiler
Outlet
Sensor
DHW Tank
Boiler
Outlet
Sensor
Outdoor
Sensor
Boiler
Supply
Sensor
Boiler Inlet Sensor
BTC
DHW Tank
BTC
0 - 10 V (dc)
Temperature Target
Boiler
Outlet
Sensor
Boiler Inlet Sensor
DHW Tank
External
Control

MODE 6
(External Target Temperature Input and DHW Operation -
Primary / Secondary Piping)
Mode 6 is designed for an external input signal and domestic hot water
(DHW) with primary / secondary piping. The external input signal can
be provided from a BMS, an EMS, or a tekmar tN4 System Control. The
external input signal creates an internal demand and changes the
boiler target according to a linear scale. The control operates the boiler
burner to maintain the boiler target at the boiler supply sensor. Refer to
section D for a description of external target temperature operation.
Once a DHW demand is present, the control operates the boiler burn-
er to maintain the DHW target at the boiler supply sensor. If both a heat
demand and a DHW demand are present at the same time, the control
targets the higher of the two requirements. Refer to section F for a
description of indirect domestic hot water operation.
MODE 7
(External Direct Drive Operation)
Mode 7 is designed for an external input signal to directly control the
firing rate of the burner with either parallel or primary / secondary pip-
ing. The DHW demand input is disabled. Refer to section E for a
description of external target temperature operation.
6 Model SF-10 Control Instructions Manual
Manual Differential
The differential can be manually set using the DIFF setting in the
Adjust menu.
Auto Differential
If the Auto Differential is selected, the control automatically deter-
mines the best differential as the load changes, thereby improving
efficiency. During light loads, the differential is increased to allow
longer on and off times to reduce the potential for short cycling.
During large loads, the differential is narrowed thereby improving
comfort in heating spaces by reducing temperature swing.
BOILER DIFFERENTIAL (DIFF)
A heat source must be operated with a differential in order to reduce short cycling. The boiler differential is divided around
the boiler target temperature. The first stage contact will close once the water temperature at the operating sensor is 1/2
of the differential setting below the boiler target temperature, and will open once the water temperature at the operating
sensor is 1/2 of the differential setting above the boiler target temperature.
BTC
0 - 10 V (dc)
Temperature Target
Boiler
Outlet
Sensor
External
Control
Boiler Inlet Sensor
Boiler
Supply
Sensor
DHW Tank
2PDA 2PDA
BTC BTC
Boiler
Inlet
Sensor
Boiler
Inlet
Sensor
External
Control
Boiler
Supply
Sensor
Boiler
Outlet
Sensor
Boiler
Outlet
Sensor
0 - 10 V (dc)
Direct Drive
Cooler Temperature Warmer
Time
160°F
(71°C) Desired temperature
Dierential
10°F (6°C)
Boiler On
155°F
(68°C)
165°F
(74°C)
Boiler On
Heating Load
On
Dierential
O
Time

STAGING
Proportional & Integral & Derivative (PID) staging to are not used in this application.
STAGE DELAY (STG DLY)
STAGE DELAY (STG DLY) is not used in this application.
BOILER MASS (BOIL MASS)
The boiler mass setting allows the installer to adjust the control to the thermal mass of different types of heat sources used.
The boiler mass setting automatically determines the minimum on time and minimum off time of the burner. A higher thermal
mass setting provides slower cycling, while a lower thermal mass provides faster cycling.
FIRE DELAY (DLY)
The Fire Delay is the delay time that may occur between the time that the control closes the Stage 1 contact and when the
burner fires. This delay is usually the result of a burner pre-purge or other forms of time delay built into the burner’s
safety circuits.
BOILER MINIMUM (BOIL MIN)
The BOIL MIN setting is the lowest water temperature that the control is allowed to use as a boiler target temperature.
During mild conditions, if the control calculates a boiler target temperature that is below the BOIL MIN setting, the boiler target
temperature is adjusted to at least the BOIL MIN setting. During this condition, if the boiler is operating, the MIN segment turns
on in the LCD while the boiler target temperature or boiler operating sensor temperature is viewed. If the installed boiler is
designed for condensing or low temperature operation, set the BOIL MIN adjustment to OFF.
Model SF-10 Control Instructions Manual 7
BOILER MAXIMUM (BOIL MAX)
The BOIL MAX setting is the highest water temperature that the control
is allowed to use as a boiler target temperature. If the control does
target BOIL MAX, and the temperature at the boiler outlet sensor is near
the BOIL MAX temperature, the MAX segment turns on in the LCD while
the boiler target, boiler inlet, boiler outlet or boiler supply temperature
is viewed.
BOILER TARGET TEMPERATURE (BOIL TARGET)
The boiler target temperature is determined from the mode of operation and the type of demand applied. The control displays
the temperature that it is currently trying to maintain at the operating sensor as BOIL TARGET in the View menu. The operat-
ing sensor for modes 1, 3 and 5 is the boiler outlet sensor, and the operating sensor for modes 2, 4 and 6 is the boiler supply
sensor. If the control does not presently have a requirement for heat, it displays “– – – ” in the LCD. There is no boiler target
temperature generated in Mode 7.
Decreasing Outdoor Temperature
Increasing Water Temperature
BOIL
MIN
BOIL
MIN
BOIL MAXBOIL MAX
WWSDWWSD

BOILER PUMP OPERATION ( )
The boiler pump contact operates when:
• A heat demand is present and parallel piping (Mode 1, 3, 5) is used. Parallel piping requires the boiler pump to
operate even while the burner is off in order to provide heat to the system.
• While the burner is firing and primary / secondary piping (Mode 2, 4, 6) is used. Primary / secondary piping reduces
standby losses by isolating the boiler from the system while the burner is off.
• During external direct drive operation (mode 7), the boiler pump contact closes whenever there is a heat demand.
• After the burner shuts off the boiler pump remains on to purge heat from the boiler to the system.
• During a DHW demand the boiler pump contact is closed unless DHW priority is selected. During DHW priority, the
boiler pump contact is off.
BOILER PUMP PURGE ( DLY)
After the burner is shut off, the control continues to operate the boiler pump for a period of time. The length of time that the
boiler pump continues to run is based on the Pump DLY setting. Once the burner turns off, the control keeps the boiler pump
running for the time selected. This setting allows purging of any excess heat out of the boiler after the boiler is shut off. This
also helps to prevent the water in the boiler from flashing into steam after the boiler is shut off.
When Pump DLY is set to OFF, there is no purging. When Pump DLY is set to ON, the pump runs continuously. When on is
selected and the control is configured for outdoor reset, the pump continues to run even during Warm Weather Shut Down.
EXERCISING
If the boiler pump has not operated at least once every 70 hours, the control turns on the output for 10 seconds. This mini-
mizes the possibility of the pump seizing during a long period of inactivity.
8 Model SF-10 Control Instructions Manual
When either mode 1 or 2 is selected, the water temperature is controlled based on a fixed setpoint. The setpoint
temperature is set using the BOIL TARGET item in the Adjust menu.
HEAT DEMAND (Dem 1)
A heat demand is required whenever heat is required for the setpoint load. A heat demand is generated when a voltage
between 24 and 120 V (ac) is applied across the CD (common demand) and the Ht D (heat demand). Once voltage is
applied, the control turns on the Dem 1 segment in the display. The control closes the pump contacts, which starts the
boiler pump and the control turns on the boiler pump segment in the display.
If the operating sensor is 1/2 of the differential below the BOIL TARGET, the control then closes the Stage 1 contact. The
boiler target temperature is set using the BOIL TARGET item in the Adjust menu. If the operating sensor reaches 1/2 of
the differential above the BOIL TARGET setting, the boiler burner is shut off. The pump contact remains closed until the
heat demand is removed and Pump DLY setting expires.
Section B: Setpoint Operation

When either mode 3 or 4 is selected, the control uses outdoor reset to control the water temperature while a heat demand
is present. Outdoor reset calculates the boiler target temperature based on the outdoor air temperature and reset ratio.
The reset ratio is determined from the Boiler Start, Boiler Design, Outdoor Start and Outdoor Design settings.
HEAT DEMAND (Dem 1)
A heat demand is required whenever heat is required in the system. A heat demand is generated when a voltage between
24 and 120 V (ac) is applied across the CD (common demand) and the Ht D (heat demand). Once voltage is applied, the
control turns on the Dem 1 segment in the display. If the control is in warm weather shut down (WWSD), the WWSD seg-
ment is shown in the display and the pump does not turn on and the burner remains off.
If the control is not in WWSD, it closes the pump contact, which starts the boiler pump and the control turns on the boil-
er pump segment in the display. If the operating sensor is 1/2 of the differential below the calculated BOIL TARGET, the
control then closes the Stage 1 contact. The boiler target temperature is determined using the reset ratio. If the operating
sensor reaches 1/2 of the differential above the BOIL TARGET setting, the boiler burner is shut off. The pump contact
remains closed until the heat demand is removed and Pump DLY setting expires.
RESET RATIO
The control uses the four following settings to determine the reset ratio:
Boiler Start (BOIL START)
The BOIL START temperature is the theoretical boiler supply water temperature that the heating system requires when the
outdoor air temperature equals the OUTDR START temperature setting. The BOIL START is typically set to the desired
building temperature.
Outdoor Start (OUTDR START)
The OUTDR START temperature is the outdoor air temperature at which the control provides the BOIL START water
temperature to the system. The OUTDR START is typically set to the desired building temperature.
Outdoor Design (OUTDR DSGN)
The OUTDR DSGN is the outdoor air temperature that is the typical coldest temperature of the year where the building is
located. This temperature is used when completing heat loss calculations for the building.
Boiler Design (BOIL DSGN)
The BOIL DSGN temperature is the water temperature required to heat the boiler zones when the outdoor air is as cold
as the OUTDR DSGN temperature.
Model SF-10 Control Instructions Manual 9
Section C: Outdoor Reset Operation
Warm Weather Shut Down (WWSD)
When the outdoor air temperature rises above the WWSD setting, the
control turns on the WWSD segment in the display. When the control is
in Warm Weather Shut Down, the Dem 1 segment is displayed if there
is a heat demand. However, the control does not operate the boiler to
satisfy this demand. The control continues to respond to DHW
demands.
Decreasing Outdoor Temperature
Increasing Water Temperature
BOIL
START
BOIL
START
OUTDR
DSGN
OUTDR
DSGN
BOIL DSGNBOIL DSGN
OUTDR
START
OUTDR
START

When modes 5 or 6 are selected, the control allows for an external control to operate the boiler temperature through an
external input signal provided by a Building Management System (BMS), Energy Management System (EMS), or tekmar
tN4 System Control. When in modes 5 or 6, the external heat demand (CD and Ht D) are disabled.
INTERNAL HEAT DEMAND
An internal heat demand is generated when an analog positive 0-10 V (dc) or 2-10 V (dc) signal is applied to the +V(in)
input. The negative V (dc) signal is applied to the Com/- input.
10 Model SF-10 Control Instructions Manual
Section D: External Temperature Target Input
0-10 V (dc) or 0-20 mA External Input Signal
The external input signal can be selected to be either 0-10 V (dc) or
2-10 V (dc) range. When the 0-10 V (dc) range is selected, an input volt-
age of 1 V (dc) corresponds to a boiler target temperature of 50°F
(10°C). An input voltage of 10 V (dc) corresponds to a boiler target tem-
perature of 210°F (99°C). As the voltage varies between 1 V (dc) and 10
V (dc), the boiler target temperature varies linearly between 50°F (10°C)
and 210°F (99°C). If a voltage below 0.5 V (dc) is received, the boiler tar-
get temperature is displayed as “ – – – “ indicating that there is no
longer an internal heat demand.
A 0-20 mA signal can be converted to a 0-10 V (dc) signal by installing
a 500
Ω resistor on the external input signal device’s terminals.
2-10 V (dc) or 4-20 mA External Input Signal
The external input signal can be selected to be either 0-10 V (dc) or
2-10 V (dc) range. When the 2-10 V (dc) range is selected, an input volt-
age of 2 V (dc) corresponds to a boiler target temperature of 50°F
(10°C). An input voltage of 10 V (dc) corresponds to a boiler target tem-
perature of 210°F (99°C). As the voltage varies between 2 V (dc) and 10
V (dc), the boiler target temperature varies linearly between 50°F (10°C)
and 210°F (99°C). If a voltage below 1.5 V (dc) is received the boiler
target temperature is displayed as “ – – – “ indicating that there is no
longer an internal heat demand.
A 4-20 mA signal can be converted to a 2-10 V (dc) signal by installing
a 500 resistor on the external input signal device’s terminals.
2-10 V (dc) 4-20 mA* Boiler Target
0 0 – – – (OFF)
1 2 – – – (OFF)
2 4 50°F (10°C)
3 6 70°F (21°C)
4 8 90°F (32°C)
5 10 110°F (43°C)
6 12 130°F (54°C)
7 14 150°F (66°C)
8 16 170°F (77°C)
9 18 190°F (88°C)
10 20 210°F (99°C)
0-10 V (dc) 0-20 mA* Boiler Target
0 0 – – – (OFF)
1 2 50°F (10°C)
2 4 68°F (20°C)
3 6 86°F (30°C)
4 8 103°F (39°C)
5 10 121°F (49°C)
6 12 139°F (59°C)
7 14 157°F (69°C)
8 16 174°F (79°C)
9 18 192°F (89°C)
10 20 210°F (99°C)
* requires a 500 resistor.
OFFSET
The Offset setting allows the boiler target temperature to be fine tuned to the external input signal. The control reads the
external input signal and converts this to a boiler target temperature. The Offset setting is then added to the boiler target tempera-
Example Range = 0-10 V (dc)
Input = 7 V (dc) 157°F (69°C)
Oset = + 5°F (3°C) + 5°F (3°C)
)C°27(F°261=tegraTrelioB

When mode 7 is selected, the control allows for an external control to operate the boiler through an analog direct drive input
signal provided by a boiler sequencing control such as a tekmar Boiler Control 265. When in mode 7, the external heat demand
(CD and Ht D) and the DHW demand (CD and DHW D are disabled.
DIRECT DRIVE INPUT SIGNAL
An external boiler sequencer provides a positive 0-10 V (dc) input signal to the control +V(in) input (pin 10). The negative V
(dc) signal is applied to the Com/- input. The boiler burner remains off while the direct drive input signal range is between 0 to
0.5 V (dc). The Stage 1 contact remains on as long as the direct drive input signal is over 0.5 V (dc).
PUMP OPERATION
The pump contact close as soon as the direct drive input signal reaches 0.5 V (dc). Once the direct drive input
signal falls below 0.5 V (dc), the pump continues to operate until the Pump DLY purge expires, then the pump shuts off.
BOILER MAXIMUM TEMPERATURE
The external boiler sequencer is able to operate the boiler temperature. However, the BOIL MAX setting limits the highest
temperature at the boiler outlet sensor. Should the boiler outlet temperature exceed the BOIL MAX setting, the Stage contact
is opened to shut off the burner. The burner remains off for the minimum off time and the boiler outlet temperature falls 2°F
(1°C) below the BOIL MAX setting.
Model SF-10 Control Instructions Manual 11
Section E: External Direct Drive Operation
When modes 1, 2, 3, 4, 5, or 6 are selected, the control is able to override the heat demand operation and respond to heat an
indirect domestic hot water (DHW) tank.
DHW DEMAND (Dem 2)
A DHW demand is required whenever the indirect DHW tank requires heating. A DHW demand is generated when a voltage
between 24 and 120 V (ac) is applied across the CD (common demand) and the DHW D (DHW demand). Once
voltage is applied, the control turns on the Dem 2 segment in the display. The control closes the DHW pump contacts, which
starts the DHW pump and the control turns on the DHW pump segment in the display.
BOILER TARGET DURING DHW OPERATION
The boiler target temperature is at least as hot as the DHW BOIL TARGET setting. If a heat demand is present during a DHW
demand, the boiler target is the higher of the two temperatures.
DHW OPERATION WITH PRIMARY / SECONDARY PIPING
When the boiler is piped in primary / secondary to the boiler and MODE
is set to 2, 4, or 6, the control operates the boiler pump together with the
DHW pump.
Section F: Domestic Hot Water Operation
Boiler
Supply
Sensor
Ω

DHW MODE & PRIORITY OPERATION (PARALLEL PIPING ONLY)
It is often desirable to have priority for the DHW tank. Priority allows for quick recovery of the DHW tank temperature. This
is achieved by limiting or even stopping the flow of heat to the heating system when the DHW tank calls for heat. The
control allows for DHW priority only when the boiler is piped in parallel to the heating system and MODE is set to 1, 3, or
5. DHW priority is achieved by shutting off the boiler pump contact while turning on the DHW pump contact.
• When DHW MODE is set to 1 there is no DHW priority.
• When DHW MODE is set to 2 there is DHW priority.
DHW FULL & CONDITIONAL PRIORITY
The control provides full DHW priority when BOIL MIN is set to OFF. This is intended for use with condensing boilers.
The control provides conditional DHW priority when BOIL MIN is not set to OFF. Should the DHW and the heat demand
targets be similar in temperature, and the boiler target is maintained at the operating sensor, then simultaneous DHW and
space heating occurs.
DHW PRIORITY OVERRIDE
Should a DHW demand and a heat demand be present at the same time, the control limits the amount of time that DHW
heating has priority over space heating. The amount of time is dependant on the Mode setting.
For Mode 3, the amount of time allowed for DHW priority is based on the measured outdoor air temperature. When the
outdoor temperature is equal to the OUT DSGN setting, the priority time is 10 minutes. When the outdoor temperature is
equal to the OUT START setting, the priority time is 2 hours. As the outdoor temperature changes between the OUT DSGN
and the OUT START setting, the priority time increases linearly.
For Modes 1 and 5, the amount of time allowed for DHW priority is fixed at 1 hour.
Once the DHW priority time elapses, the DHW priority override operation is dependant on the BOIL MIN setting.
While in DHW priority override and the BOIL MIN setting is not set to OFF, the DHW pump and the boiler pump are
operated together in order to provide simultaneous DHW and space heating. The control can resume DHW priority should
the boiler target be satisfied for 5 minutes.
While in DHW priority override and the BOIL MIN setting is set to OFF, the control performs a DHW post purge to lower
the boiler temperature, the DHW pump is shut off, and then space heating is resumed. This operation is intended for oper-
ation with condensing boilers.
DHW POST PURGE
After the DHW Demand is removed, the control performs a purge on the boiler. In MODE 1, 3, or 5 (parallel piping), the
control shuts off the burner and continues to operate the DHW pump. In MODE 2, 4, or 6 (primary / secondary piping),
the control shuts off the burner and continues to operate the DHW pump while the boiler pump is turned on. This purges
the residual heat from the boiler into the DHW tank. The control continues this purge for a maximum of two minutes or
until the boiler supply water temperature drops 20°F (11°C) below the boiler target temperature during the DHW opera-
tion. The control also stops the purge if the operating sensor temperature is close to the current boiler target temperature.
DHW MIXING PURGE
After DHW priority, the space heating zones may have cooled off considerably after being off for a period of time;
meanwhile, the boiler is hot. To avoid thermally shocking the boiler after DHW priority, the control shuts off the burner, but
continues to operate the DHW pump while restarting the boiler pump. This allows some of the DHW tank return water to
mix with the cool return water from the zones and temper the boiler return water.
12 Model SF-10 Control Instructions Manual
Boiler
Outlet
Sensor
Boiler
Outlet
Sensor

Model SF-10 Control Instructions Manual 13

14 Model SF-10 Control Instructions Manual
External Input
The control can accept an external input signal from an external control. If an external
input signal is required, connect the positive 0-10 V (dc) wire to the +V(in) pin and
connect the negative 0-10 V (dc) wire to the Com/-.
The wiring harness must be unplugged from the connector on the control before testing. To remove the wiring harness,
push down on the tab on the connector and pull away from the control.
The following tests are performed using standard testing practices and procedures and should only be carried out by
properly trained and experienced persons.
A good quality electrical test meter, capable of reading from at least 0-300 V (ac) and at least 0-2,000,000 Ohms, is essen-
tial to properly test the wiring and sensors.
Testing
TEST THE SENSORS
In order to test the sensors, the actual temperature at each sensor
location must be measured. A good quality digital thermometer
with a surface temperature probe is recommended for ease of use
and accuracy. First measure the temperature using the thermome-
ter and then measure the resistance of the sensor at the control.
Using the chart below, estimate the temperature measured by the
sensor. The sensor and the thermometer readings should be close.
If the meter reads a very high resistance, there may be a broken
wire, a poor wiring connection or a defective sensor. If the resist-
ance is very low, the wiring may be shorted, there may be moisture
in the sensor or the sensor may be defective. To test for a defective
sensor, measure the resistance directly at the sensor location.
Temperature Resistance
°F °C
-50 -46 490,813
-45 -43 405,710
-40 -40 336,606
-35 -37 280,279
-30 -34 234,196
-25 -32 196,358
-20 -29 165,180
-15 -26 139,402
-10 -23 118,018
-5 -21 100,221
0 -18 85,362
5 -15 72,918
10 -12 62,465
15 -9 53,658
Temperature Resistance
°F °C
20 -7 46,218
25 -4 39,913
30 -1 34,558
35 2 29,996
40 4 26,099
45 7 22,763
50 10 19,900
55 13 17,436
60 16 15,311
65 18 13,474
70 21 11,883
75 24 10,501
80 27 9,299
85 29 8,250
Temperature Resistance
°F °C
90 32 7,334
95 35 6,532
100 38 5,828
105 41 5,210
110 43 4,665
115 4 6 4 ,18 4
120 49 3,760
125 52 3,383
130 54 3,050
135 57 2,754
140 60 2,490
145 63 2,255
150 66 2,045
155 68 1,857
Temperature Resistance
°F °C
160 71 1,689
165 74 1,538
170 77 1,403
175 79 1,281
180 82 1,172
185 85 1,073
190 88 983
195 91 903
200 93 829
205 96 763
210 99 703
215 102 648
220 104 598
225 107 553

Model SF-10 Control Instructions Manual 15
TEST THE POWER SUPPLY
Make sure exposed wires are not in contact with other wires or grounded
surfaces. Turn on the power and measure the voltage between the C and R
pins using an AC voltmeter, the reading should be between 22 and 26 V (ac).
TEST THE POWERED INPUTS
Heat Demand
If a heat demand is used, measure the voltage between the CD (common
demand) and the Ht D (heat demand) pins. When the heat demand device
calls for heat, between 20 and 130 V (ac) should be measured at the pins.
When the heat demand device is off, less than 5 V (ac) should be measured.
DHW Demand
If a DHW demand is used, measure the voltage between the CD (common demand) and the DHW D (DHW demand) pins.
When the DHW demand device calls for heat, between 20 and 130 V (ac) should be measured at the pins. When the
setpoint demand device is off, less than 5 V (ac) should be measured.
TEST THE EXTERNAL INPUT
If an external input signal is used, measure the voltage between the Com/- and +V(in) pins. When the external control calls
for heat, between 0 and 10 V (dc) should be measured.
CONNECTING THE CONTROL
Make sure all power to the devices and wiring harness is off.
Reconnect the wiring harness to the connector on the control by aligning the tab on the wiring harness to the tab on the
connector on the control and then pushing the wiring harness into the connector on the control. The tab on the wiring har-
ness should snap over the tab on the connector of the control.
Apply power to the control. The operation of the control on power up is described in the Sequence of Operation section
of the brochure.
22 to 26 V (ac)
20 to 130 V (ac)

16 Model SF-10 Control Instructions Manual
TESTING THE CONTROL’S OUTPUTS
The control has a built-in test routine that is used to override the main control functions. The test sequence is enabled
when the Up button is pressed and held for 5 seconds while in the View menu. The test sequence can be cancelled by press-
ing either the Item, Up or Down button. Once the test sequence is enabled, the outputs are tested in the following sequence:
DIP SWITCH SETTING
Note: DIP switches are located on the front of the control. Remove bottom cover and screw for access.
STEP 1 The boiler pump is turned on.
STEP 2 Stage 1 burner is turned on.
STEP 3 Stage 2 burner is turned on. Note: Stage 2 is not used in this application.
STEP 4 The boiler pump, Stage 1 and Stage 2 are shut o. The DHW pump is
turned on for 10 seconds.
STEP 5 The DHW pump shuts o. The alarm contact is closed for 10 seconds
Press and hold the up button for 3 seconds while in the View menu.
The control exits the test sequence and resumes normal operation.
Control Settings
(1) Factory / Installer
The Factory / Installer DIP switch is used to select which items are available to
be viewed and / or adjusted in the user interface. The Factory Access Level
includes all the settings available in the control. The Installer Access Level
includes the settings and items which are required for system setup.
(2) Not Used
Factory Installer
OFF
OFF
2
1

Model SF-10 Control Instructions Manual 17
The control receives a heat demand provided from zone valve end switches or a switching relay end switch. The control turns
on the boiler pump and operates the boiler to maintain the setpoint boiler target temperature at the boiler outlet
sensor whenever a heat demand is present. The control receives a DHW Demand from a DHW aquastat. The control turns on
the DHW pump and operates the boiler to maintain the DHW boiler target temperature at the boiler outlet sensor whenever a
DHW demand is present.
Applications
MODE 1 and 2 – Setpoint & DHW Operation
MODE 1 SETPOINT & DHW OPERATION – PARALLEL PIPING
Boiler
Inlet
Sensor
Boiler
Outlet
Sensor
DHW
Tank
BTC
The control receives a heat demand provided from zone valve end switches or a switching relay end switch. The control turns
on the boiler pump and operates the boiler to maintain the setpoint boiler target temperature at the boiler supply
sensor. The control receives a DHW Demand from a DHW aquastat. The control turns on the DHW pump, boiler pump,
and operates the boiler to maintain the DHW boiler target temperature at the boiler supply sensor whenever a DHW demand
is present.
MODE 2 SETPOINT & DHW OPERATION – PRIMARY / SECONDARY
Boiler
Supply
Sensor
Boiler
Inlet
Sensor
Boiler
Outlet
Sensor
DHW
Tank
BTC

18 Model SF-10 Control Instructions Manual
View Menu (1 of 1)
MODE 1 and 2 – Setpoint & DHW Operation
egnaRnoitpircseDsseccAdleiFmetI
Factory
Installer
BOILER TARGET
The boiler target is the temperature the control is currently
trying to maintain at the boiler supply sensor or the boiler
outlet sensor.
– – –, 35 to 226°F, OFF
(– – –, 2 to 108°C, OFF)
Factory
Installer
BOILER SUPPLY SENSOR
Current boiler supply water temperature as measured by the
boiler supply sensor.
Note: This item is only available when MODE is set to 2.
14 to 266°F
(-10 to 130°C)
Factory
Installer
BOILER OUTLET
Current boiler outlet water temperature as measured by the
boiler outlet sensor.
Note: When MODE is set to 2 this item is only visible in the
Factory access level.
14 to 266°F
(-10 to 130°C)
Factory
Installer
BOILER INLET
Current boiler inlet water temperature as measured by the
boiler inlet sensor.
Note: This item is only available when a boiler inlet sensor is
installed.
14 to 266°F
(-10 to 130°C)
Factory
BOILER DELTA T
Current temperature dierence between the boiler outlet sensor
and the boiler inlet sensor.
Note: This item is only available when a boiler inlet sensor is
installed.
0 to 252°F
(0 to 140°C)
Factory
BOILER HOURS
The total number of running hours of the boiler since this item
was last cleared. Clear the numbers of hours by pressing and
holding the Up and Down buttons together while viewing this
item.
0 to 999

Model SF-10 Control Instructions Manual 19
Adjust Menu (1 of 1)
MODE 1 and 2 – Setpoint & DHW Operation
Item Field Access Description Range Settings
Factory
Installer
MODE
Select the operating mode for the control.
1, 2, 3, 4, 5, 6, 7
Default = 3
Factory
Installer
BOILER TARGET
Select the boiler target temperature for setpoint
operation.
OFF, 70 to 220°F
(OFF, 21 to 104°C)
Default = 180°F
(82°C)
Factory
BOILER MAXIMUM
Select the maximum boiler target water
temperature.
120 to 225°F, OFF
(49 to 107°C, OFF)
Default = 180°F
(82°C)
Factory
BOILER MINIMUM
Select the minimum temperature allowed for
the boiler target temperature.
OFF, 80 to 180°F
(OFF, 27 to 82°C)
Default = 140°F
(60°C)
Factory
FIRE DELAY
Selecttheamountoftimerequiredfor combustion
pre-purging, ignition and the ame to be
established.
0:00 to 3:00 minutes
Default = 0:10 min
(1 second incre-
ments)
Factory
Installer
BOILER MASS
Select the thermal mass of the boiler.
1 (low mass)
2 (medium mass)
3 (high mass)
Default = 2
Factory
Installer
STAGE DELAY
Select the minimum time delay between
stages. Note: This setting is not used in this application.
Au, 0:30 to 9:55 min
Default = Au
Factory
DIFFERENTIAL
Select the dierential that the control is to use
when it is operating the boiler.
Au, 2 to 42°F
(Au, 1 to 23°C)
Default = Au
Factory
DHW BOILER TARGET
Select the boiler target temperature while
heating an indirect DHW tank.
OFF, 70 to 220°F
(OFF, 21 to 104°C)
Default = 180°F
(82°C)
Factory
DHW MODE
Select no priority (1) or priority (2) of indirect
DHW heating over space heating.
Note: This item is only available when MODE
is set to 1.
1, 2
Default = 1
Factory
PUMP DELAY
Select the boiler pump purge time after shutting
o the burner.
OFF 0:20 to 9:55 min ,
On
Default = 0:20 min
Factory
Installer
TEMPERATURE UNITS
Select to display temperature in degrees
Fahrenheit or in degrees Celsius.
°F, °C
Default = °F

20 Model SF-10 Control Instructions Manual
Applications
MODE 3 and 4 – Outdoor Reset & DHW Operation
Boiler
Inlet
Sensor
Boiler
Outlet
Sensor
DHW
Tank
BTC
Boiler
Supply
Sensor
Boiler
Inlet
Sensor
Boiler
Outlet
Sensor
DHW
Tank
BTC
MODE 3 – OUTDOOR RESET AND DHW OPERATION WITH PARALLEL PIPING
The control receives a heat demand provided from zone valve end switches or a switching relay end switch. The control
turns on the boiler pump and operates the boiler to maintain the outdoor reset boiler target temperature at the boiler out-
let sensor. The control receives a DHW Demand from a DHW aquastat. The control turns on the DHW pump and operates
the boiler to maintain the DHW boiler target temperature at the boiler outlet sensor whenever a DHW demand is present.
The control receives a heat demand provided from zone valve end switches or a switching relay end switch. The control
operates the boiler to maintain the outdoor reset boiler target temperature at the boiler supply sensor. The control receives
a DHW Demand from a DHW aquastat. The control turns on the DHW pump, boiler pump, and operates the boiler to main-
tain the DHW boiler target temperature at the boiler supply sensor whenever a DHW demand is present.
MODE 4 – OUTDOOR RESET AND DHW OPERATION WITH PRIMARY / SECONDARY PIPING
Outdoor
Sensor
Outdoor
Sensor