How it Works
LAARS
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SC 12
User Manual
28 pgs1.25 Mb0

LAARS SC 12 User Manual

LINE
NEUT
OUTPUT 8
OUTPUT 9
OUTPUT 7
OUTPUT 11
INCREMENT
AUTO
OFF
LEAD STAGE
ROTATION
SELECT SETTING
UP
DOWN
INPUTS
1 2 345 6 789
10
SAFETY GROUND MUST BE CONNECTED
11
12
Sensor ComShield + SensorCom
DryContact
Only
DryContact
Only
TEMP
SHUTDOWN
/SETBACK
PROVE
/DHW
SYSTEM
Output 7
OFF
AUTO
ON
Output 8
OFF
AUTO
ON
Output 9
OFF
AUTO
ON
Output 10
OFF
AUTO
ON
Output 11
OFF
AUTO
ON
Output 12
OFF
AUTO
ON
OFF
AUTO
ON
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
OUTPUT 6
Output 1
OFF
AUTO
ON
Output 2
OFF
AUTO
ON
Output 3
OFF
AUTO
ON
Output 4
OFF
AUTO
ON
Output 5
OFF
AUTO
ON
Output 6
OFF
AUTO
ON
System
LEAD
OUTPUT ON
4-20ma
OUTDOOR
SC
SC FUNCTION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DIP SWITCH CHART
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . 
M
OUNTING THE SC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
S
ET THE DIP SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
W
IRING THE POWER INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
WIRING THE INPUT TERMINALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
W
IRING THE STAGE OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WIRING THE SYSTEM OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
BEFORE POWER UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
P
OWER UP SEQUENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ADJUSTING THE CONTROL SETTING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SET POINT CONTROL WITH NORMAL SEQUENCING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DIP SWITCH 8 - OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SET POINT CONTROL WITH OSS SEQUENCING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
O
UTDOOR RESET WITH NORMAL SEQUENCING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OUTDOOR RESET WITH OSS SEQUENCING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SC-6 AND SC-12 OUTPUT WIRING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
WIRING THE STAGE OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SC-6P OUTPUT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
WIRING THE STAGE OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SAMPLE WIRING AND PLUMBING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
OUTPUT RELAY CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
OPERATION . .  18
SET POINT CONTROL SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
OUTDOOR RESET SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
NORMAL SEQUENCING SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
O
VERSIZE SYSTEM SEQUENCING SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SYSTEM OUTPUT SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
LEAD STAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
OUTPUT CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
EXTERNAL SET POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5
LINE
NEUT
OUTPUT 8
OUTPUT 9
OUTPUT 7
OUTPUT 10
OUTPUT 11
OUTPUT 12
INCREMENT
AUTO
OFF
LEAD STAGE
ROTATION
SELECT SETTING
UP
DOWN
INPUTS
1 2 345 6 789
10
SAFETY GROUND MUST BE CONNECTED
11
12
Sensor Com Shield + Sensor Com
DryContact
Only
DryContact
Only
TEMP
SHUTDOWN
/SETBACK
PROVE
/DHW
SYSTEM
Output 7
OFF
AUTO
ON
Output 8
OFF
AUTO
ON
Output 9
OFF
AUTO
ON
Output 10
OFF
AUTO
ON
Output 11
OFF
AUTO
ON
Output 12
OFF
AUTO
ON
OFF
AUTO
ON
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
OUTPUT 6
Output 1
OFF
AUTO
ON
Output 2
OFF
AUTO
ON
Output 3
OFF
AUTO
ON
Output 4
OFF
AUTO
ON
Output 5
OFF
AUTO
ON
Output 6
OFF
AUTO
ON
System
LEAD
OUTPUT ON
4-20 ma
OUTDOOR
SC
Digital display reads
sensor value constantly
Install a relay for each output stage which will be active
Use these three buttons to adjust the settings
In AUTO, the lead stage will automatically rotate among the active outputs. Press to
INCREMENT for manual rotation.
Each Stage Output has one set of N.O. contacts
The green LEAD stage
light indicates which
stage will be activated
first on a system call
The red OUTPUT lights
indicate when the relays
are energized and the
N.O. contacts are
continuous.
The System Output is SPDT
Each output can be switched ON, AUTO, or OFF. In AUTO, the output will be controlled based on system requirements.
120 VAC Power Input GND must be connected
Sensor, Shutdown/Setback,
Prove/DHW, and Outdoor
input terminals
1 2 3 4 5 6 7 8
ON
Switch 1
System Output
Switch 5 Rotation
Switches 6 and 7
Input Type
5
First On/Last Off
Lead stage rotates
every 24 hours
5
First On/First Off
First stage on is
the first stage
turned off
Temperature
6 7
External Set Point
Available for temperature
systems only, 4-20mA
signal changes Set Point
6 7
ON
ON
ON
ON
Switch 8
Set Point or Reset
8
Set Point
Set Point control
for temperature
8
Outdoor Reset
Hydronic heating
control with
outdoor reset
ON
ON
1
System Pump
SYSTEM relay is on
based on outside temp, Shutdown, and DHW priority
1
Combustion Air
Damper/Prove
SYSTEM relay is
on when any
OUTPUT is on
ON
ON
Switches 2, 3, and 4
Stage Type
2Stage Lo/Lo/Hi/Hi
On load increase
sequence on Lo
stages first, then Hi
stages
2
On/Off Stages
Each stage is
either on or off
2 Stage Lo/Hi
On load increase
sequence Lo to Hi
then next Lo to Hi
3 4
2 3 4
2
3 Stages
On load increase
sequence Lo, Mid,
Hi
3 4
2 3 4
4 Stages
On load increase
sequence Lo,
LoMid, HiMid, Hi
2 3 4
ON
ON
ON
ON
ON
ON
temperature is from 20 to 120°F.
the enclosure.
the metal front panel).
- System relay output type - Combustion Air Damper, or System Pump operation
- Stage type - On/Off, Lo/Hi, 3 Stage or 4 Stage
- Rotation Sequence - First On/Last Off or First On/First Off
- Input type - Temperature or External Set Point
- Operation - Set Point or Outdoor Reset
IMPORTANT
The dip switches must be set correctly. Carefully, check the details of the installation and
WIRING THE POWER INPUTS
voltage wiring.
LINE.
NEUT.
WIRING THE INPUT TERMINALS
and
NOT
be installed in between boiler connections to header. If the sensor does not
register the output of all the stages, it will not be able to Sequence properly.
2 COM
Mounting Holes
LINE
NEUT
Surge
Suppressor
Power Switch
Ground
Line
Neut
INPUTS
1 2 3
4
5 6
Sensor Com Shield + Sensor Com
TEMP PRES 4-20 ma
Shield
To Temperature Sensor
in Common Header
6
and dip switch 7 must be
monitor the 4-20mA input to change the set point. (See wiring sensor on pg. 3) Also, see pg. 23 for
EMS programming parameters.
and
SETBACK
setting to 0 the
SHUTDOWN
feature is enabled by
were on will remain on until the System Delay is over, then they will also turn off.
SHUTDOWN
feature can be used whenever it is desirable to turn off the SC from a remote
SETBACK
is enabled by adjusting control
SETBACK
setting to a value higher
than 0 and closing a dry contact wired to terminals 7 and 8, the SC will immediately reduce the
temperature of the circulating hot water by the
SETBACK
setting amount (see pg. 20 to
SETBACK)
SHUTDOWN/SETBACK
signal must be a dry contact only to terminals 7 and 8. No voltage can be
placed across the
SHUTDOWN/SETBACK
terminals.
and
) and Domestic Hot Water (
).
PROVE
feature is used to check system components’ operation before activating any stages. See
pg. 24 for typical applications.
PROVE
input terminals are open, the SC will enable only the System Output relay. All Stage
PROVE
input is open.
DHW
) input is enabled by closing a dry contact, the Calculated water
temperature or the Set Point will change to 200°F and the decimal point on the left-most digit on the
DHW
input will take priority over the outdoor reset function or the Outdoor Cutoff temperature.
Regardless of outdoor temperature, when the
DHW
input is closed, the SC will Sequence stages to
hold 200°F.
NO
external conditions must be met before Stage Output is activated and terminals
and
are not used for Domestic Hot
Water (see pg. 25),
DO NOT
remove the factory installed jumper across the
PROVE/DHW
terminals.
PROVE/DHW
signal must be a dry contact only to terminals 9 and 10. No voltage can be placed across the
PROVE/DHW
terminals.
IMPORTANT
input terminals must be
and
).
). If it is installed, it will act as an Outdoor
windows, exhaust fans, vents, or other possible heat sources.
and 12.
Note that both sensor shields will be connected
to terminal 3.
Dry Contact
Prove or Domestic
Hot Water Signal
INPUTS
5 6 7
8910
11
Sensor Com
DryContact
Only
DryContact
Only
SHUTDOWN
/SETBACK
PROVE
/DHW
OUTD
4-20 ma
INPUTS
5 6 7
89101112
Sensor Com
DryContact
Only
DryContact
Only
SHUTDOWN
/SETBACK
PROVE
/DHW
4-20 ma
OUTDOOR
To Outdoor Sensor
In Shade
Shield
2 3
4
Com Shield +
TEMP
4
5 6
+ Sensor Com
4-20 ma
SC Source Current
24VDC Excitation Voltage
(-) Input (+) Signal
INPUTS
5 6 7
8
9
Sensor Com
DryContact
Only
DryContact
SHUTDOWN
/SETBACK
PROVE
4
+
4-20 ma
Dry Contact
Shutdown and
Setback Signal
4
5 6
+ Sensor Com
4-20 ma
EMS Sourcing Current
(-) Input (+) Signal
WIRING THE STAGE OUTPUTS
WIRING THE SYSTEM OUTPUT
- If there is no call for stage output, the System relay is off
- On a call for stage output, the System relay is energized
- When the
PROVE
input is made, the lead stage is energized
- The System relay remains energized as long as any stage is active
- When the last stage turns off, the System relay remains energized for the period of
time set by the System Delay (see pg. 22)
- Then the System relay is turned off.
PROVE
inputs. The
PROVE
input can be used in a
and the Shutdown is not
- The System relay will be energized when any stage is active
- After the last stage is turned off, the System relay will remain energized for the period of time set by the System Delay (see pg.
22) and then turn off.
- When the outdoor temperature below the Outdoor Cutoff + 2°F (
+ 2°F), the
- Otherwise, the System relay will be off above
+ 2°F (after the System Delay
has expired).• When the control is set
- The System relay will be off for an adjustable period of time set by the DHW Priority Time
- After the Priority Time has elapsed, when the outdoor temperature is below the Outdoor Cutoff + 2°F (
+ 2°F) setting, the
- When the outdoor temperature is 2°F above the Outdoor Cutoff (
+
2°F), the System relay will be off at all times.
switch in the
AUTO
position.
switch in the
position.
LEAD STAGE
switch in the
AUTO
position for automatic rotation.
SYSTEM
C.
N.C.
N.O.
Combustion Air Damper
Line
Neut
SYSTEM
C.
N.C.
N.O.
System Pump
Line
Neut
WARNING
the parameters are correct, there is no need to make any adjustments.
reapply power.
the SC will operate in Fahrenheit. If the display shows
then the SC will operate in Celsius.
button to increase the value,
DOWN
button to decrease the value.
and
(see pg. 25).
the Input terminals
and
will function in the Prove mode. If the display shows
then the same
terminals will function in the DHW mode.
button to increase the value, or
the
DOWN
button to decrease the value.
will fl ash.
Normal
or PID type Sequencing mode provides the most stable operation. Stages are turned on or off
based on the rate of change of the system temperature and the impact a stage has on that rate.
) Sequencing
mode that brings on stages proportionally, based on how high above or far below the Set Point the current system temperature is.
For more details, see pg. 21.
(Normal) then the SC will Sequence in the PID type mode. If the display shows
then SC will
around the Set Point
button to increase the value, or the
DOWN
button to decrease the value.
will fl ash. This completes the startup Sequence and the SC will display the sensor temperature.
the SC will operate in Fahrenheit. If the display shows
then the SC will operate in Celsius.
button to increase the value,
DOWN
button to decrease the value.
Minimum Water Temperature
INCREMENT
AUTO
OFF
LEAD STAGE
ROTATION
For Automatic Lead
Stage Rotation
Output
OFF
AUTO
ON
For Non-Active
Stages
For Stages Which are
to be Part of the
Automatic Sequence
button to increase the
value, or the
DOWN
button to decrease the value.
will fl ash.
and
(see pg. 25).
the Input terminals
and
will function in the Prove mode. If the display shows
then the same
terminals will function in the DHW mode.
button to increase the value, or
the
DOWN
button to decrease the value.
will fl ash.
based on the rate of change of the system temperature and the impact a stage has on that rate.
Sequencing mode
that brings on stages proportionally, based on how high above or far below the Set Point the current system temperature is. For
more details, (see pg. 21).
then the SC will Sequence in the PID type mode. If the display shows
then SC will
button to increase the value, or the
DOWN
button to decrease the value.
will fl ash. This completes the startup Sequence and the SC will display the sensor temperature.
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