Slant/Fin EM-10 User manual

MODEL EM-10
ELECTRIC BOILER CONTROL
Publication No. EM-10-40
Printed in U.S.A. 914
Part No. 792820000
OPERATION AND INSTRUCTION MANUAL
The EM-10 Boiler Temperature Control (BTC) is an efficient
boiler operator with a digital LCD display with backlight, a
boiler pump output, an alert output, and four stage outputs.
The control regulates the boiler based upon setpoint, outdoor
reset, and several options for external boiler control.
Features:
• Setpoint Operation
• Outdoor Reset with Reset Override
• Four Stage Outputs
• External Control through BMS Signal
• External Control through Tekmar Boiler Controls
• Boiler Pump Operation
• Parallel Piping
• Primary – Secondary Piping
• Display Backlight
See Service Manual (792840000) for:
• Tekmar 275 and other External Direct Drive
Operation
• Two Setpoint Operation
• Dedicated DHW and Parallel Operation
• External Target/ Setpoint Operation

This brochure is organized into three main sections.
They are: 1) Sequence of Operation, 2) Installation, and
3) Control Settings.
The Control Settings section of this brochure describes
the various items that are adjusted and displayed by the
control. The control functions of each adjustable item are
described in the Sequence of Operation.
2EM-10-40 Operation and Instruction Manual
How to Use the Data Brochure
Table of Contents
User Interface ..................................................................2
Display and Symbol Description ......................................3
Modes of Operation..........................................................4
Setpoint Operation ..........................................................8
Outdoor Reset Operation ................................................9
Installation ......................................................................10
Control Settings..............................................................11
DIP Switch Settings........................................................11
Mode 4 and 5 - Outdoor Reset / Setpoint Operation ....12
Default Settings ........................................................13-16
View Menu......................................................................13
Adjust Menu ..................................................................14
View Menu......................................................................15
Error Messages..............................................................17
Reload Factory Defaults ................................................18
Specifications ................................................................20
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, p,q) 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, p,q) 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 por qbutton 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

3
EM-10-40 Operation and Instruction Manual
Item
Number Field
Displays the current value
of the selected item
Item Field
Displays the current
item selected.
Menu Field
Displays the
current menu
Buttons
Selects Menus, Items
and adjusts settings
Status Field
Displays the current status of
the control’s inputs, outputs
and operation
Display
Symbol Description
BOILER PUMP
Displays when the boiler pump is in
operation.
BURNER
Displays when stage 1, 2, 3, or 4 contact
is on.
WWSD
Displays when the control is in Warm
Weather Shut Down.
DEMAND 1
Displays when a call for heat on demand
1 is present.
DEMAND 2
Displays when a call for heat on demand
2 is present.
ERROR
Displays when an error message is
present.
POINTERS
Displays operation as indicated by the text.
°F,°C °F or°C
Displays the temperature units.

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.
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 boiler outlet sensor or the boiler supply sensor.
4EM-10-40 Operation and Instruction Manual
Symbol Description
Factory Installed
Boiler Outlet Sensor
Boiler Inlet Sensor (Included)
Factory Installed
Boiler Outlet Sensor
Secondary Piping
Sensor (Included)
Boiler Inlet Sensor (Optional)

5
EM-10-40 Operation and Instruction Manual
MODE 4
(Outdoor Reset and Setpoint with Parallel Piping)
Mode 4 is designed for outdoor reset and setpoint operation
using parallel piping.The heat demand is available to provide
outdoor reset for space heating systems. The
setpoint can be used to heat an indirect domestic hot
water tank.
Once a heat demand is present, the control stages the
boiler to maintain the calculated outdoor reset target at the
boiler outlet sensor. Refer to “Outdoor Reset Operation”
section for a description of outdoor reset operation.
Once a setpoint demand is present, the control stages the
boiler to maintain the boiler target at the boiler outlet sensor.
If both demands are present at the same time, the control
targets the higher of the two requirements. Refer to “Setpoint
Operation” section for a description of setpoint operation.
MODE 5 (Outdoor Reset and Setpoint with Primary/
Secondary Piping)
Mode 5 is designed for outdoor reset and setpoint operation
using primary / secondary piping. The heat demand is
available to provide outdoor reset for space heating systems.
The setpoint demand can be used to heat an indirect
domestic hot water tank.
Once a heat demand is present, the control stages the
boiler to maintain the calculated outdoor reset target at the
boiler supply sensor. Refer to “Outdoor Reset Operation”
section for a description of outdoor reset operation.
Once a setpoint demand is present, the control stages the
boiler to maintain the boiler target at the boiler supply
sensor. If both demands are present at the same time, the
control targets the higher of the two requirements. Refer to
section “Setpoint Operation” for a description of setpoint
operation.
BTC
Mode 5
Outdoor
Sensor
Relay
Factory
Installed
Boiler
Outlet
Sensor
Secondary
Piping
Sensor
(Included)
Boiler Inlet Sensor (Optional)
BTC
Mode 4
Relay
Outdoor
Sensor
Factory
Installed
Boiler
Outlet
Sensor
Boiler Inlet Sensor (Included)

STAGING MODE (STGMODE)
The control can operate up to four stages in order to
supply the required target temperature. The method of
staging used by the control is either P (proportional) or
PID (Proportional & Integral & Derivative), and is selected
using the STGMODE item in the Adjust menu.
Proportional & Integral & Derivative (PID)
PID staging allows the control to determine when the next
stage is required to turn on. After a stage is turned on in
the firing sequence, the control waits a minimum amount of
time (Stage Delay) before turning on the next stage. After
the minimum time delay between stages has expired, the
control examines the control error to determine when the
next stage is to fire. The control error is determined using
PID logic.
Proportional logic compares the actual operating sensor
temperature to the boiler target temperature.The colder the
temperature, the sooner the next stage is turned on.
Integral logic compares the actual operating sensor
temperature to the boiler target temperature over a period
of time.
Derivative logic determines how fast or slow the operating
sensor temperature is changing. If the temperature is
increasing slowly, the next stage is turned on sooner. If
the temperature is increasing quickly, the next stage is
turned on later, if at all.
STAGE DELAY (STG DLY)
The stage delay is the minimum time between firing first
to second stage, second to third stage, and third to fourth
stage and is determined by the Stage Delay setting. It can
be manually set, or it can be set to automatic in which the
boiler mass determines the stage delay time.
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
stage delay on, stage delay off, minimum on time and
minimum off time of the stages. A higher thermal mass
setting provides slower staging, while a lower thermal mass
provides faster staging.
Proportional (P)
Proportional staging, also known as step staging, is based
on manually adjusted settings that determine when the
next stage is required to turn on. These manual settings are
based on temperature and time. The interstage differential
sets the temperature drop at which the next stage turns on.
However, in order for a stage to fire, the interstage delay
on and minimum off times must first elapse.
Interstage Differential (STG DIFF)
The interstage differential is the temperature drop at which
the next stage will turn on. Once a stage turns on, the
next stage cannot turn on until the temperature drops
the interstage differential below the temperature at which
the previous stage turned on. The interstage differential
is adjustable through the STG DIFF setting in the Adjust
menu.
Interstage On Delay (ON DLY)
The interstage on delay is the amount of time that must
elapse before turning on the next stage. Once a stage turns
on, the next stage cannot turn on until the interstage delay
on time elapses. The interstage on delay is adjustable
through the ON DLY setting in the Adjust menu.
Interstage Off Delay (OFF DLY)
The interstage off delay is the amount of time that must
elapse before turning off the next stage. Once a stage turns
off, the next stage cannot turn off until the interstage delay
off time elapses. The interstage off delay is adjustable
through the OFF DLY setting in the Adjust menu.
Minimum On Time (MIN ON)
The minimum on time is the minimum amount of time that
a stage must be on before it is allowed to turn off. Once a
stage turns on, it cannot turn off until a minimum on time
elapses. The minimum on time is adjustable through the
MIN ON setting in the Adjust menu.
6EM-10-40 Operation and Instruction Manual
175 °F
170°F
180°F Setpoint
Proportional Staging
185°F
190°F
155°F
150°F
145°F
140°F
160°F
165°F
Stage 4
Stage 3
Stage 2
Stage 1
water
temperature
droop
water
temperature
droop
water
temperature
droop
175 °F
170°F
180°F Setpoint
P.I.D. Staging
very little
temperature
droop
185°F
165°F
Stage 4
Stage 3
Stage 2
Stage 1
P.I.D. = Proportional + Integral + Derivative

7
EM-10-40 Operation and Instruction Manual
Minimum Off Time (MIN OFF)
The minimum off time is the minimum amount of time that
a stage must be off before it is allowed to turn on. Once a
stage turns off, it cannot turn on until a minimum off time
elapses. The minimum off time is adjustable through the
MIN OFF setting in the Adjust menu.
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.
Manual Differential
The differential can be manually set using the DIFF setting
in the Adjust menu.
Auto Differential
Auto differential is only available when using PID staging.
If the Auto Differential is selected, the control automatically
determines 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.
FIRE DELAY (Burner symbol DLY)
Does NOT apply to electric boiler operation.
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 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 operating sensor for modes 1, 3, 4 and
6 is the boiler outlet sensor, and the operating sensor for
modes 2, 5 and 7 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 8.
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.
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.
Proportional Staging
A Minimum On Time
B Minimum Off Time
C Interstage On Delay
D Interstage Off Delay
A B C D
Boil MAX
Boil MIN
WWSD
OUTDR DSGN
Boil DSGN
Boil START
OUTDR START
Fixed Differential
Differential
Desired Temperature
Desired Temperature
Increasing
Temperature
Increasing Time
ON ON
OFF OFF
Boil MAX
Boil MIN
WWSD
OUTDR DSGN
Boil DSGN
Boil START
OUTDR START
Automatic Differential
Differential
Low
Heat
Load ON ON
OFF OFF
Differential
High
Heat
Load ON ON
FFOFFO
Boil MAX
Boil MIN
WWSD
OUTDR DSGN
Boil DSGN
Boil START
OUTDR START
Partial Outdoor Reset
Decreasing Outdoor Air Temperature
Increasing Water Temperature
Boil MAXBoil MAX
Boil MINBoil MIN
WWSDWWSD
OUTDR DSGN
Boil DSGN
Boil START
OUTDR START

BOILER OUTLET MAXIMUM
The BOIL OUT MAX setting determines the highest water
temperature allowed at the boiler outlet sensor. The boiler
stages are immediately shut off once the water temperature
exceeds the BOIL OUT MAX setting at the boiler
outlet sensor location.
BOILER PUMP OPERATION
The boiler pump contact operates when:
• A heat demand is present and parallel piping (Mode 1,
3, 4, 6) is used. Parallel piping requires the boiler pump
to operate even while the boiler is off in order to provide
heat to the system.
• While the boiler is on and primary / secondary piping
(Mode 2, 5, 7) is used. Primary / secondary piping
reduces standby losses by isolating the boiler from the
system while the boiler is off.
• After the boiler shuts off the boiler pump remains on to
purge heat from the boiler to the system.
BOILER PUMP PURGE ( DLY)
After the boiler 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 boiler 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
PUMP EXERCISING
If the boiler pump has not operated at least once every 70
hours, the control turns on the output for 10 seconds. This
minimizes the possibility of the pump seizing during a long
period of inactivity.
ALERT
The control closes the alert contact whenever an error
message is present.
A setpoint is a fixed water temperature target that the
boiler is to maintain at the operation sensor once a demand
is present. The boiler maintains the boiler target by
operating the stages using proportional or PID logic
together with the boiler differential.
Modes 4 to 7 and Setpoint Demand (Dem 2)
A setpoint demand is required whenever heat is required
for the secondary heating load such as an indirect domestic
hot water tank. A setpoint demand is generated when a
voltage between 24 and 120 V (ac) is applied across the
CD (common demand) and the Set D (setpoint demand).
Once voltage is applied, the control turns on the Dem 2
segment in the display and control operates the boiler stages
to maintain the BOIL TARGET at the boiler outlet sensor
(Mode 4, 6) or the boiler supply sensor (Mode 5, 7).
8EM-10-40 Operation and Instruction Manual
Setpoint Operation
Boil MAX
Boil MIN
WWSD
Setpoint Operation
+1/2 Differential
Setpoint Target
-
1/2 Differential
OUTDR DSGN
Boil DSGN
Boil START
OUTDR START

9
When either mode 4 or 5 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. As a result, the boiler target changes
proportional to the outdoor temperature. 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) pins.
Once voltage is applied, the control turns on the Dem 1
segment in the display. If the control is not in warm weather
shut down (WWSD), the control calculates a boiler target
based on the reset ratio and outdoor air temperature. The
pump and the boiler stages are operated to maintain the
boiler target at the boiler outlet sensor (Mode 4), or the
boiler supply sensor (Mode 5).
If the control is in WWSD, the WWSD segment is shown
in the display and the boiler target in the View menu of the
display remains “---“ (no target).
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.
Warm Weather Shut Down (WWSD)
When the outdoor air temperature rises above the WWSD
setting, the control enters WWSD and turns on the WWSD
segment in the display. Once the outdoor air temperature
falls below the WWSD setting, the control exits WWSD.
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 the heat
demand. The control continues to respond to setpoint
demands.
Outdoor Reset Operation
Boil MAX
Boil MIN
WWSD
Reset Ratio
Decreasing Outdoor Air Temperature
Increasing Water Temperature
OUTDR DSGNOUTDR DSGN
Boil DSGNBoil DSGN
Boil STARTBoil START
OUTDR STARTOUTDR START
EM-10-40 Operation and Instruction Manual

10 EM-10-40 Operation and Instruction Manual
The installer should test to confirm that no voltage is
present at any of the wires during installation. The control
includes a 24 pin connector for ease of installation.
NOTE: Figure shown should be used for checking control
only. Boiler wiring diagram should be used for checking the
rest of boiler, because interface board has different terminal
numbers.
Powered Input Connections
24 V (ac) Power
Connect the 24 V (ac) power supply to the C and R
terminals. This connection provides power to
the microprocessor and display of the control. As well, this
connection provides power to the Alert terminal from
the R terminal.
Heat Demand
To generate a heat demand, a voltage between 24 V (ac)
and 120 V (ac) must be applied across the CD (common
demand) and the Ht D (heat demand) pins.
Setpoint Demand
To generate a setpoint demand, a voltage between 24 V (ac)
and 120 V (ac) must be applied across the CD (common
demand) and the Set D (setpoint demand) pins.
Caution: The same power supply must be used for both the
heat demand and setpoint demand circuits since they
share the CD (common demand) pin.
Output Connections
Boiler Pump Contact
The Pump pins are an isolated output in the control.
There is no power available on these pins from
the control. This output is to be used as a switch to either
make or break power to the boiler pump. Since this is an
isolated contact, it may switch a voltage between 24 V (ac)
and 120 V (ac).
Stage Contacts
Stage 1, Stage 2, Stage 3, and Stage 4 are isolated
outputs in the control. There is no power available
on these pins from the control. This output is to be used as
a switch to either make or break the stage circuits. When
the control requires the stage to fire, it closes the Stage
contact.
Alert Contact
The Alert pin on the control is connected to an audible alarm
on the interface board which sounds an alert when it senses
an open sensor circuit.
Sensor and Unpowered Input Connections
Do not apply power to these terminals as this damages
the control.
Boiler Outlet Sensor
Connect the two wires from the Boiler Outlet Sensor to the
Com/- (common sensor) and Boil O (boiler outlet sensor)
pins. The boiler outlet sensor is used by the control to meas-
ure the boiler outlet water temperature from the boiler.
Note: The boiler outlet sensor is required for every mode of
operation.
Boiler Inlet Sensor
Connect the two wires from the Boiler Inlet Sensor to the
Com/- (common sensor) and Boil in (boiler inlet sensor)
pins. The boiler inlet sensor is used by the control
to measure the boiler inlet water temperature from the boiler.
Note: The boiler inlet sensor is optional for every mode
of operation.
Boiler Supply Sensor
An optional Boiler Supply Sensor may be connected to the
control. If the sensor is required, connect the two wires from
the sensor to the Com (common sensor) and Sys/D (boiler
supply) pins.
Electrical Connections to the Control
Installation
11
10
9
8
7
6
5
4
3
2
1
12
+V(in)
Com/-
Boil in
Boil O
Sys/D
Out
Com
Set D
Ht D
CD
C
23
22
21
20
19
18
17
16
15
14
13
24
Alert
Stg 4
Stg 4
Stg 3
Stg 3
Stg 2
Stg 2
Stg 1
Stg 1
Pmp
Pmp
R
AOFF
B OFF

11
DIP Switch Settings
Control Settings
Outdoor Sensor
An optional Outdoor Sensor may be connected to the
control. If the sensor is required, connect the two wires from
the Outdoor Sensor to the Com (common sensor) and Out
(outdoor sensor) pins. The outdoor sensor is used by the
control to measure the outdoor air temperature.
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/- pin.
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 harness 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.
TESTING THE CONTROL 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 pbutton is pressed and held for 3 sec-
onds while in the View menu. The test sequence can be can-
celled by pressing either the Item, por qbutton. Once the
test sequence is enabled, the outputs are tested in the follow-
ing sequence.
Press and hold the pbutton for 3 seconds while in the
View menu.
Note: DIP switches are located on the front of the control.
(A) 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.
(B) Not Used
Factory Installer
OFF
OFF
B
A
Step 1 Boil The boiler pump is turned on.
Step 2 Boil 1Stage 1 heating element(s) on.
Step 3 Boil 12 Stage 2 heating element(s) on.
Step 4 Boil 123 Stage 3 heating element(s) on.
Step 5 Boil 1234 Stage 4 heating element(s) on.
Step 6
The boiler pump and stages 1
to 4 are shut off. The alert is
closed for 10 seconds.
The control exits the test sequence and resumes normal
operation.
EM-10-40 Operation and Instruction Manual

12 EM-10-40 Operation and Instruction Manual
Applications
Mode 4 and 5 – Outdoor Reset and Setpoint Operation
Mode 4 – Outdoor Reset and Setpoint 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 temperature at the boiler
outlet sensor. The control receives a setpoint demand from
a DHW aquastat. 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 setpoint
demand is present.
Note: An external relay is required to operate the DHW
pump and provide DHW priority if required by disabling
the boiler pump.
Mode 5 – Outdoor Reset and Setpoint with Primary
– Secondary Piping
The control receives a heat demand provided from zone
valve end switches or switching relay end switch. The
control turns on the boiler pump and operates the boiler to
maintain the outdoor reset target temperature at the boiler
supply sensor. The control receives a setpoint demand
from a DHW aquastat.The control turns on the boiler pump
and operates the boiler to maintain the setpoint boiler
target temperature at the boiler supply sensor whenever a
setpoint demand is present.
Note: An external relay is required to operate the DHW
pump and provide DHW priority if required by disabling the
system pump or zone pumps.
BTC
Mode 4
Relay
Outdoor
Sensor
Boiler Inlet Sensor (Included)
Factory
Installed
Boiler
Outlet
Sensor
BTC
Mode 5
Outdoor
Sensor
Relay
Factory
Installed
Boiler
Outlet
Sensor
Boiler Inlet Sensor (Optional)
Secondary
Piping
Sensor
(Included)

13
EM-10-40 Operation and Instruction Manual
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - View Menu
sseccAnoitpircseDegnaRdleiFmetI
-60 to 190°F
(-51 to 88°C)
OUTDOOR
Current outdoor air temperature as measured by the
outdoor sensor.
Factory
Installer
---,
35 to 266°F
(2 to 130°C),
OFF
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.
Factory
Installer
14 to 266°F
(-10 to 130°C)
BOILER SUPPLY
Current boiler supply water temperature as measured
by the boiler supply sensor.
Note: This item is only available when MODE is set to 5.
Factory
Installer
14 to 266°F
(-10 to 130°C)
BOILER OUTLET
Current boiler outlet water temperature as measured
by the boiler outlet sensor.
Note: When MODE is set to 5 this item is only visible
in the Factory access level.
Factory
(Installer for
Mode 4)
14 to 266°F
(-10 to 130°C)
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.
Factory
Installer
0 to 252°F
(0 to 140°C)
BOILER DELTA T
Current temperature difference between the boiler outlet
sensor and the boiler inlet sensor.
Note: This item is only available when a boiler inlet
sensor is installed.
Factory
0 to 999
BOILER ON HOURS
The total number of running hours of the boiler since
this item was last cleared. Clear the numbers of hours
while viewing this item.
Factory
VIEW MENU
After the last item, the control returns to the first item in the menu.
The View menu items display current operating
temperatures and system status information. Use the
Item button to view items in this menu.
Item
View Next Item

14 EM-10-40 Operation and Instruction Manual
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (1 of 3)
Item Field Range Description Access Setting
1 to 8
MODE
Select the operating mode for the control.
Factory
Installer
PId or P
STAGE MODE
Select the staging operation to be either
automatic or manual.
(PId = automatic)
(P = proportional)
Factory
Installer
OFF,
70 to 220°F
(21 to 104°C)
BOILER TARGET
Select the boiler target temperature while
a setpoint demand is present.
Factory
Installer
35 to 85°F
(2 to 29°C)
OUTDOOR START
Select the outdoor starting temperature
used in the reset ratio for the heating
system. Typically set to the desired building
temperature.
Factory
Installer
-60 to 32°F
(-51 to 0°C)
OUTDOOR DESIGN
Select the outdoor design temperature used
in the reset ratio for the heating system. Set
to the coldest annual outdoor temperature
in the local area.
Factory
Installer
35 to 150°F
(2 to 66°C)
BOILER START
Select the starting water temperature used
in the reset ratio calculation for the heating
system. Typically set to the desired building
temperature.
Factory
Installer
70 to 220°F
(21 to 104°C)
BOILER DESIGN
Select the boiler design water temperature
used in the reset ratio calculation for the
heating system. Set to the boiler water
temperature required to heat the building on
the coldest annual outdoor temperature.
Factory
Installer
120 to 225°F
(49 to 107°C)
BOILER OUTLET MAXIMUM
Select the maximum boiler outlet
temperature. Exceeding this temperature
shuts off the boiler.
Factory
ADJUST MENU
Continued on next page.
The Program menu items are the programmable settings
used to operate the system. Press and hold all three
buttons simultaneously to enter the Program menu
ItemItem
Change Value
Next ItemEnter Adjust Menu
Default
Setting 4

15
EM-10-40 Operation and Instruction Manual
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (2 of 3)
Item Field Range Description Access Setting
120 to 225°F
(49 to 107°C),
OFF
BOILER MAXIMUM
Select the maximum boiler target
temperature.
Factory
OFF,
80 to 180°F
(27 to 82°C)
BOILER MINIMUM
Select the minimum boiler target
temperature.
Factory
0:00 to 3:00 min
(1 second
increments)
FIRE DELAY
Select the amount of time required for
combustion pre-purging, ignition and the
flame to be established.
Note: This setting is only available when
STAGE MODE is set to Pld.
Factory
1 (Lo) or
2 (Med) or
3 (Hi)
BOILER MASS
Select the thermal mass of the boiler.
Note: This setting is only available when
STAGE MODE is set to PId.
Factory
Installer
Au, 0:30 to
9:55 min
STAGE DELAY
Select the minimum time delay between
stages.
Note: This setting is only available when
STAGE MODE is set to PId.
Factory
Installer
Au, 2 to 42°F
(1 to 23°C)
DIFFERENTIAL
Select the boiler differential.
Note: The automatic setting is only available
when STAGE MODE is set to Pld staging.
Factory
0 to 10°F
(0 to 6°C)
STAGE DIFFERENTIAL
Select the interstage temperature differential
between stages for proportional staging.
Note: This setting is only available when
STAGE MODE is set to P.
Factory
0:10 to 8:00 min
INTERSTAGE ON DELAY
Select the amount of time that must pass
once a stage has been turned on in order
to allow the next stage to turn on.
Note: This setting is only available when
STAGE MODE is set to P.
Factory
0:10 to 4:00 min
INTERSTAGE OFF DELAY
Select the amount of time that must pass
once a stage has been turned off in order
to allow the next stage to turn off.
Note: This setting is only available when
STAGE MODE is set to P.
Factory
ADJUST MENU
Continued on next page.
NOT VALID
FOR ELECTRIC
BOILER
APPLICATION

16 EM-10-40 Operation and Instruction Manual
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (3 of 3)
Item Field Range Description Access Setting
0:10 to 5:00 min
MINIMUM ON TIME
Select the minimum amount of time that
the stage contact must remain on before it
is allowed to turn off.
Note: This setting is only available when
STAGE MODE is set to P.
Factory
0:10 to 5:00 min
MINIMUM OFF TIME
Select the minimum amount of time that
the stage contact must remain off before it
is allowed to turn back on.
Note: This setting is only available when
STAGE MODE is set to P.
Factory
OFF, 0:20 to
9:55 min, On
PUMP DELAY
Select the boiler pump purge time after
shutting off the boiler.
Factory
35 to 100°F
(2 to 38°C),
OFF
WARM WEATHER SHUT DOWN
Select the heating system warm weather
shut down for outdoor reset operation. Heat
demands are ignored once the outdoor air
temperature exceeds this setting.
Factory
Installer
°F or °C
TEMPERATURE UNITS
Select to display temperature in degrees
Fahrenheit or in degrees Celsius.
Factory
Installer
After the last item, the control returns to the first item in the menu.
ADJUST MENU
Default
Setting 65˚F

17
Error Messages (1 of 2)
E01
The control was unable to read a piece of information from its EEPROM memory. The
control will stop operation until all settings in the Adjust menu have been checked by the
user or installer. To clear the error message, set Access Level DIP Switch A to Factory
(on position), then check all Adjust menu items.
BOILER OUTLET SENSOR SHORT CIRCUIT
The control is no longer able to read the boiler outlet sensor due to a short circuit. In this
case, if the boiler inlet sensor is present and operational, the control will operate using
the boiler inlet sensor. Otherwise, the control will not operate the boiler.
Test the boiler outlet sensor and related wiring. The error message will clear once the
error condition is corrected and a button is pressed.
BOILER OUTLET SENSOR OPEN CIRCUIT
The control is no longer able to read the boiler outlet sensor due to an open circuit. In this
case, if the boiler inlet sensor is present and operational, the control will operate using
the boiler inlet sensor. Otherwise, the control will not operate the boiler.
Test the boiler outlet sensor and related wiring. The error message will clear once the
error condition is corrected and a button is pressed.
BOILER INLET SENSOR SHORT CIRCUIT
The control is no longer able to read the boiler inlet sensor due to a short circuit. In this
case, the control will continue operation.
Test the boiler inlet sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
BOILER INLET SENSOR OPEN CIRCUIT
The control is no longer able to read the boiler inlet sensor due to an open circuit. In this
case, the control will continue operation.
Test the boiler inlet sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
BOILER SUPPLY SENSOR SHORT CIRCUIT
The control is no longer able to read the boiler supply sensor due to a short circuit. In
this case, if the boiler outlet sensor is operational, the control will operate based on the
boiler outlet sensor. If the boiler outlet sensor is not available and the boiler inlet sensor is
present and operational, the control will operate using the boiler inlet sensor. Otherwise,
the control will not operate the boiler.
Test the boiler supply sensor and related wiring. The error message will clear once the
error condition is corrected and a button is pressed.
BOILER SUPPLY SENSOR OPEN CIRCUIT
The control is no longer able to read the boiler supply sensor due to an open circuit. In
this case, if the boiler outlet sensor is operational, the control will operate based on the
boiler outlet sensor. If the boiler outlet sensor is not available and the boiler inlet sensor is
present and operational, the control will operate using the boiler inlet sensor. Otherwise,
the control will not operate the boiler.
Test the boiler supply sensor and related wiring. The error message will clear once the
error condition is corrected and a button is pressed.
OUTDOOR SENSOR SHORT CIRCUIT
The control is no longer able to read the outdoor sensor due to a short circuit. In this case
the control assumes an outdoor temperature of 32°F (0°C) and continues operation.
Test the outdoor sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
EM-10-40 Operation and Instruction Manual

18 EM-10-40 Operation and Instruction Manual
Error Messages (2 of 2)
OUTDOOR SENSOR OPEN CIRCUIT
The control is no longer able to read the outdoor sensor due to an open circuit. In this case
the control assumes an outdoor temperature of 32°F (0°C) and continues operation.
Test the outdoor sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
DHW TANK SENSOR SHORT CIRCUIT
The control is no longer able to read the DHW tank sensor due to a short circuit. In this
case, the control will not operate the boiler.
Test the DHW tank sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
DHW TANK SENSOR OPEN CIRCUIT
The control is no longer able to read the DHW tank sensor due to an open circuit. In this
case, the control will not operate the boiler.
Test the DHW tank sensor and related wiring. The error message will clear once the error
condition is corrected and a button is pressed.
RELOAD FACTORY DEFAULTS
To reload FACTORY DEFAULT SETTINGS, press and hold the outside
buttons (Item and Down) while powering the control up. This will reload
the FACTORY DEFAULTS.

19
EM-10-40 Operation and Instruction Manual

SLANT/FIN CORPORATION, Greenvale, N.Y. 11548 • Phone: [phone]
FAX: [phone] •Canada: Slant/Fin LT D/LTE E , Mississauga, Ontario
www.slantfin.com
©Slant/Fin Corp. 2014
Technical Data
EM-10 Electric Boiler Temperature Control
Packaged weight — 0.38 lb. (170 g)
— Enclosure D, black noryl plastic
Dimensions — 4-3/4” H x 2-7/8” W x 1-7/8” D (120 x 74 x 48 mm)
Approvals — ANSI Z21.23, CAN 1-6.6-M78-R2001, UL873, UL840
Ambient conditions — Indoor use only, -40 to 140°F (-40 to 60°C),
< 90% RH non-condensing
Power supply — 24 V (ac) ±10% 50/60 Hz 75 VA
Pump / Stage 1 Relays — 120 V (ac) 5 A 1/6 hp pilot duty 240 VA
Stage 2, 3, 4 Relays — 120 V (ac) 3 A 1/6 hp pilot duty 240 VA
Demands — 24 to 120 V (ac) 2 VA
Sensors — NTC thermistor, 10 kø @ 77°F (25°C ±0.2°C) ß=3892
Included: — 1 of Universal Sensor 071 with 96" long wires (S/F P/N 790400000)
Outdoor Sensor 070 (S/F P/N 339070000)
Factory Installed: — Universal Sensor 071
Publication No. EM-10-40 • Printed in U.S.A. 914 • Part No. 792820000