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LAARS Heating Systems

POWER UP SEQUENCES

• Whenever the SC is powered up, it displays the software version number and then the

operating parameters. Each display will remain on the screen approximately 5 seconds. If

the parameters are correct, there is no need to make any adjustments.

• Once the parameters have been set for a particular application, they will be retained in memory and will not need to be reset.

• Note that if you do change any parameter, or make any changes to the dip switch positions, all

settings will revert to their default values and must be reset.

• A parameter can only be changed in the start-up Sequence. To restart, it is necessary to remove and

reapply power.

• Set the parameters to ﬁ nd the appropriate Sequence for your application, Set Point Control -

Temperature and External Set Point (pgs. 10 and 11) or Outdoor Reset (pgs. 12 and 13)

Set Point Control - Temperature and External Set Point

Temperature Display Mode

Default: Fahrenheit

• The SC can be ﬁ eld adjusted to read temperature sensors and display the Set Point either in °F or °C.

• The sensor input range is from -35 to 250°F or from -30° to 120°C.

• If the display shows

°F

the SC will operate in Fahrenheit. If the display shows

°F

°C

then the SC will operate in Celsius.

°C

• To change the temperature display mode, hold down the center button while pushing either the

button to increase the value,

or the

DOWN

button to decrease the value.

DOWN

• When the correct display mode is shown, release the button and wait approximately 5 seconds. If any changes were made, the

display will ﬂ ash.

Set Input Terminals 9 and 10 to PROVE or DHW

Default: Prove

• If the system is designed to provide heat and DHW, the SC can be programmed to hold a 200°F Setpoint when a call for DHW is

connected to Input terminals

and

(see pg. 25).

• All other applications should use the default Prove setting (see pg. 24).

• If the display shows

the Input terminals

and

will function in the Prove mode. If the display shows

then the same

terminals will function in the DHW mode.

• To change the Input terminal functions, hold down the center button while pushing either the

button to increase the value, or

the

DOWN

button to decrease the value.

DOWN

• When the correct value is shown, release the button and wait approximately 5 seconds. If any changes were made, the display

will ﬂ ash.

Set the Sequencing Mode

Default: Normal

• For most applications, the

Normal

or PID type Sequencing mode provides the most stable operation. Stages are turned on or off

Normal

based on the rate of change of the system temperature and the impact a stage has on that rate.

• For applications where the stages are oversized for most load conditions, the SC has an Oversize System (

OSS

) 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.

• If the display shows

nor

(Normal) then the SC will Sequence in the PID type mode. If the display shows

OSS

then SC will

Sequence stages based on a Throttling Range

thr

around the Set Point

• To change the Sequence function, hold down the center button while pushing either the

button to increase the value, or the

DOWN

button to decrease the value.

DOWN

• When the correct value is shown, release the button and wait approximately 5 seconds. If any changes were made, the display

will ﬂ ash. This completes the startup Sequence and the SC will display the sensor temperature.

Outdoor Reset Control

Temperature Display Mode

Default: Fahrenheit

• The SC can be ﬁ eld adjusted to read temperature sensors and display the Set Point either in °F or °C.

• The sensor input range is from -35 to 250°F or from -30 to 120°C.

• If the display shows

°F

the SC will operate in Fahrenheit. If the display shows

°F

°C

then the SC will operate in Celsius.

°C

• To change the temperature display mode, hold down the center button while pushing either the

button to increase the value,

or the

DOWN

button to decrease the value.

DOWN

• When the correct display mode is shown, release the button and wait approximately 5 seconds. If any changes were made, the

display will ﬂ ash.

Minimum Water Temperature

Default: 140

• T

for the appropriate setting or call Laars for information.

INCREMENT

AUTO

OFF

LEAD STAGE

ROTATION

For Automatic Lead

Stage Rotation

Output

OFF

AUTO

For Non-Active

Stages

For Stages Which are

to be Part of the

Automatic Sequence

Содержание SC 12

Страница 1: ...4 20 ma OUTDOOR SC Non Modulating Model SC6 SC6P and SC 12 Output panel to Sequence up to 12 individual stages with lead lag and manual override capabilities Installation and Operation Instructions FOR YOUR SAFETY This product must be installed and serviced by a professional service technician qualiﬁed in hot water heater boiler controls installation and maintenance This manual is intended for any...

Страница 2: ...SWITCH 8 OFF 10 SET POINT CONTROL WITH OSS SEQUENCING 11 OUTDOOR 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 SETTIN...

Страница 3: ... 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 Th...

Страница 4: ...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 ...

Страница 5: ...ter the enclosure through a different opening from any Class 2 voltage wiring Connect the hot line to terminal marked LINE Connect the neutral line to the terminal marked NEUT The green ground screw must be connected to earth ground Wiring a surge suppressor is recommended before wiring to the SC Control WIRING THE INPUT TERMINALS System Temperature Sensor Terminals 1 2 and 3 The System Temperatur...

Страница 6: ...ntact the Calculated water DHW input is enabled by closing a dry contact the Calculated water DHW temperature or the Set Point will change to 200 F and the decimal point on the left most digit on the display will ﬂash The DHW input will take priority over the outdoor reset function or the Outdoor Cutoff temperature DHW input will take priority over the outdoor reset function or the Outdoor Cutoff ...

Страница 7: ... active The System relay will remain energized even if all Output Stages are off If an outdoor sensor is not connected or registers a fault condition 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 control is set for no DHW priori...

Страница 8: ...crease the value DOWN button to decrease the value DOWN When the correct value is shown release the button and wait approximately 5 seconds If any changes were made the display will ﬂash Set the Sequencing Mode Default Normal For most applications the Normal or PID type Sequencing mode provides the most stable operation Stages are turned on or off Normal or PID type Sequencing mode provides the mo...

Страница 9: ...OWN button to decrease the value DOWN When the correct value is shown release the button and wait approximately 5 seconds If any changes were made the display will ﬂash Set the Sequencing Mode Default Normal nor For most applications the Normal or PID type Sequencing mode provides the most stable operation Stages are brought on or off based on the rate of change of the system temperature and the i...

Страница 10: ...e System Delay is adjustable from 0 to 30 minutes Default is 0 5 or 6 Times Purge Time The Purge Time should be set to the length of the unit s purge cycle The Purge Time will apply when any ON OFF unit is activated On multiple stage units the Purge Time will only apply to the Lo stages The Purge Time is adjustable from 0 0 to 10 0 minutes Default is 0 6 or 7 Times Boiler runtime This is the minim...

Страница 11: ...nt With a known 4mA input the offset can be set to make the External Set Point 110 F The Program Offset is adjustable between 10 F to 10 F Default is 0 F 4 or more Times Throttling Range The throttling range sets the number of degrees or psi above and below the Set Point where stages will be turned on or off The Throttle Range is adjustable from 1 F to 20 F Default is 5 F See page 24 for details 5...

Страница 12: ...will remain energized after the last Output has been turned off or the outdoor temperature rises above the Starter The System Delay is adjustable from 0 to 30 minutes 8 Times Purge Time The Purge Time should be set to the length of the unit s purge cycle The Purge Time will apply when any ON OFF unit is activated On multiple stage units the Purge Time will only apply to the Lo stages The Purge Tim...

Страница 13: ...regardless of outdoor temperature or the reset curve selected The Offset is adjustable from 40 F to 40 F Default is 0 F 6 Times System Delay The System Delay controls how long the System relay will remain energized after the last Output has been turned off or the outdoor temperature rises above the Starter The System Delay is adjustable from 0 to 30 minutes 7 Times Throttling Range The throttling ...

Страница 14: ...ally Open N O relay contact The N O contacts are dry contacts only They do not source any voltage Each N O contact is capable of switching 6A resistive Total output of all stages including the SYSTEM must not exceed 15A ON OFF Units Each unit has one relay and one set of Stage OUTPUT contacts associated with it OUTPUT contacts associated with it OUTPUT Wire the N O relay contacts in series with th...

Страница 15: ...to the Hi control circuit 3 Stage Lo Mid Hi Units Each unit has one pump relay and three stage relays associated with it Check the chart for the Pump Lo Mid and Hi OUTPUT positions OUTPUT positions OUTPUT Connect the N O pump relay contacts in series with the unit s pump starter Connect the Lo N O relay contacts in series with the unit s limit circuit Connect the Mid N O relay contacts to the Mid ...

Страница 16: ...Inputs Pump 3 Pump 2 Pump 1 Pump 3 Pump 2 Pump 1 Connect to 120VAC see page 5 Plumbing Class 1 Wiring Class 2 Sensor Wiring The laars SC Sequencing control DOES NOT source power for boiler stages or pumps It operates as dry contact switch A separate power source for the burners and pumps must be supplied 1 Laars is aware that each installation is unique Thus Laars is not responsibe for any install...

Страница 17: ...re HiFire HiFire LoMid LoMid Output 7 Limit Limit Limit Limit Limit Limit Limit Limit Limit Limit Limit HiMid HiMid Output 8 Limit Limit Limit Limit Limit HiFire HiFire HiFire MidFire MidFire HiFire HiFire Output 9 Limit Limit Limit Limit Limit Limit HiFire HiFire Limit Output 10 Limit Limit Limit HiFire HiFire Limit LoMid Output 11 Limit Limit Limit MidFire HiMid Output 12 Limit HiFire HiFire HiF...

Страница 18: ...not register a fault from the Outdoor sensor OPn Open or SHt short For heating when the Outdoor temperature drops below the Outdoor Cutoff temperature the SC will begin to Sequence stages for heat It will continue to Sequence until the Outdoor temperature rises to 2 F above the Outdoor Cutoff temperature The Outdoor Cutoff temperature can be set from 40 to 100 F In addition an ON setting is provid...

Страница 19: ...or heat It will continue to Sequence until the Outdoor temperature rises to 2 F above the Outdoor Cutoff temperature The Outdoor Cutoff temperature can be set from 40 to 100 F In addition an ON setting is provided to override the Outdoor Cutoff for continuous Sequencing and an OFF setting can be used to temporarily prevent any Sequencing The Outdoor Cutoff has a built in 2 F differential If the Ou...

Страница 20: ...ature display ﬂashing the new value NORMAL SEQUENCING SETTINGS REACTION TIME Rt Default 2 minutes The Reaction Time controls how Output Stages are Sequenced on and off based on PID type logic Shorter Reaction Times allow Output Stages to be Sequenced more quickly and are appropriate for systems with many small stages where any single stage does not signiﬁcantly change the total output Longer React...

Страница 21: ...r Calculated water temperature to allow the Output Stage to run longer and therefore also be off longer before restarting The Last Stage Hold provides an adjustable temperature value which is added to the Set Point or Calculated water temperature When heating the SC will keep the last Output Stage running until the System temperature exceeds the Set Point or Calculated water temperature plus the L...

Страница 22: ...age The Output with the green light on is currently the Lead Stage Only one Stage Output can be the Lead Stage at any given time The Lead Stage is always the ﬁrst stage brought on when there is a call for output LEAD STAGE SWITCH The LEAD STAGE switch controls the rotation of the Stage Outputs LEAD STAGE switch controls the rotation of the Stage Outputs LEAD STAGE A unit can not be lead if any of ...

Страница 23: ... position OFF position OFF OUTPUT LIGHTS The row of red lights marked OUTPUT ON indicate which outputs are energized If the red light next to a Stage Output is on then its output relay should be energized and the output contacts should be continuous If the red light next to a Stage Output is off the output relay should not be energized and the output contacts should be open EXTERNAL SET POINT The ...

Страница 24: ...st be continuous for any Stage Output to be active If the PROVE PROVE inputs are opened when Stage PROVE inputs are opened when Stage PROVE Outputs are active then they will immediately de energize and the individual Pump Outputs on the SC 6P will de energize after the System Delay time The Prove function is the default value for Input terminals 9 and 10 However the same input terminals can be pro...

Страница 25: ...t will close the DHW input terminals DHW input terminals DHW If the System Output is conﬁgured for Combustion Air Damper operation the System relay output will be closed when any Stage Output is activated to hold the 200 F set point If the System Output is conﬁgured for System Pump operation without DHW priority see pg 22 then the System relay will be closed whenever the outdoor temperature is bel...

Страница 26: ...r Temperature Display Outdoor Temperature Display shows SHt The SC sees a short across the input terminals Remove the wires from the OUTDOOR 11 and 12 and 12 and inputs The display should change to read OPn If it doesn t the SC may be damaged Outdoor Temperature Display shows an Incorrect Reading Remove the wires from the OUTDOOR 11 and 12 inputs The outdoor temperature display should change to re...

Страница 27: ...nit being energized to determine why it is not operating Red stage light is lit but the unit is not on The SC is calling for this unit to be on Follow the procedure above Red stage light is not lit but the unit is on SC N O contacts If there is no continuity the SC output is working correctly Check the unit for any other operating controls which may be causing it to run Stage Outputs don t Sequenc...

Страница 28: ...ervice Service Advisors 20 Industrial Way Rochester NH 03867 603 335 6300 Fax 603 335 3355 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Litho in U S A Laars Heating Systems 0806 Document 4200 ...

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