LAARS M4-Ext Installation Manual

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Page 1

Laars Modulating Controls

Document 4211A

PWR

OUTPUT RATINGS:

120VAC, 6A RESISTIVE

1A PILOT DUTY, 15A TOTAL

FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz , 30VA MAX

USE COPPER WIRE,

CLASS 1 WIRE ONLY.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

99RA

SYS

CAUTION: RISK OF ELECTRIC SHOCK

More than one disconnect switch may be required

to de-energize the equipment before servicing.

SYSTEM

CUR / VLT

CUR / VLTBCUR / VLTCCUR / VLT

CUR / VLT

VLT

GND

VLT

GND

FULL MODULATION SEQUENCING

Full Modulation Sequencing Control

RUNPROGRAM

CUR / VLTCCUR / VLT

VLT

GND

VLT

GND

Mini-MOD

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

OUTDOOR

SYSTEM

OUTDOOR

TEMP

---

SYSTEM TEMP

TEMP

Modulating

---

EXTENSION

SHUTDOWN

PROVE

SHUTDOWN

PROVE

/DHW

MODULE

/SETBACK

RS-485

Model M4 and M4-Ext

Output panel to Modulate

up to 16 individual

stages with lead-lag and

manual override capabilities

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 anyone who will install, operate or maintain the control system. Before you begin installation and operation of this control, it is important that you thoroughly review this manual. Improper installation and operation could result in damage to equipment and possibly even personal injury. Laars Sequencing Controls are not intended for use as operation safety limit controls. Another control, that is intended and certiﬁed as a high limit control, must be in the water heater/boiler control circuit.

Page 2

Page 2 LAARS Heating Systems

Contents

M4 LAYOUT . . . . . . . . . . . . . . . . . 3

M4 OVERVIEW . . . . . . . . . . . . . . . 4

UNDERSTANDING OPERATION CONCEPT 5

Reset Ratio/Outdoor Reset . . . . . . . . . .5

INITIAL PILOT PROGRAM . . . . . . . . . 6

Making Sure You Have the Right Control . 6

Selecting the System Features. . . . . . . 6

INSTALLATION . . . . . . . . . . . . . . . 7

Mounting the Enclosure . . . . . . . . . . 7

Install the Sensors . . . . . . . . . . . . . 8

Heating System Sensor (HSS) Installation. . .8

Outdoor Sensor Installation . . . . . . . . . . 8

Wiring. . . . . . . . . . . . . . . . . . . . 9

Wiring the Power (Terminals 1, 2) . . . . . . . 9

Wiring the Sensors . . . . . . . . . . . . . . . 9

Wiring the Shutdown (Terminals 31, 32) . . . .9

Wiring the System Prove (Terminals 29, 30) 10 Wiring the Domestic Hot Water Call DHW

(Terminals 29, 30) . . . . . . . . . . . . . . 10

Wiring the System Output (Terminals 3, 4) . . 10

Wiring the Boilers . . . . . . . . . . . . . . 10

Wiring to Modulating Motors . . . . . . . . . 11

Connecting to the M4-Extension Panels . . . 11

MENU SEQUENCE . . . . . . . . . . . . . 12

Startup Settings . . . . . . . . . . . . . . 14

Program Change Settings . . . . . . . . . . 14

Startup Sequence . . . . . . . . . . . . . . 14

Sensor Type . . . . . . . . . . . . . . . . . 14

EMS Input Mode (Available in Set Point Only) 14

Selecting the Output Type . . . . . . . . . . 14

Selecting the Modulating Mode . . . . . . . 15

Prove/Domestic Hot Water (DHW) . . . . . . 15

Setback Mode . . . . . . . . . . . . . . . . 15

Boost Mode . . . . . . . . . . . . . . . . . 15

Sensor Fault . . . . . . . . . . . . . . . . . 15

Operating Settings . . . . . . . . . . . . . 16

Program Change Settings . . . . . . . . . . 16

Season . . . . . . . . . . . . . . . . . . . . 16

Set Point . . . . . . . . . . . . . . . . . . . 16

Reset Ratio. . . . . . . . . . . . . . . . . . 16

Outdoor Cutoff Temperature . . . . . . . . . 17

Offset . . . . . . . . . . . . . . . . . . . . . 17

Minimum Water Temp . . . . . . . . . . . . 17

Maximum Water Temp . . . . . . . . . . . . 18

System Settings . . . . . . . . . . . . . . 18

Gain . . . . . . . . . . . . . . . . . . . . . 18

Lead Boiler Rotation . . . . . . . . . . . . . 18

Purge Delay . . . . . . . . . . . . . . . . . 19

Lag Delay . . . . . . . . . . . . . . . . . . 19

Standby Time. . . . . . . . . . . . . . . . . 19

System Run-On . . . . . . . . . . . . . . . 19

Setback. . . . . . . . . . . . . . . . . . . . 20

Last Stage Hold . . . . . . . . . . . . . . . 20

Day/Night Schedules . . . . . . . . . . . . . 21

Set Time . . . . . . . . . . . . . . . . . . . 21

History . . . . . . . . . . . . . . . . . . . 21

Maintenance . . . . . . . . . . . . . . . . 22

System & Outdoor Sensor Trim . . . . . . . 22

Soft-Off Delay . . . . . . . . . . . . . . . . 22

Output Trim. . . . . . . . . . . . . . . . . . 22

Conﬁguration . . . . . . . . . . . . . . . . . 23

Display . . . . . . . . . . . . . . . . . . . 23

Display Boiler Modulation Status. . . . . . . 23

Display Messages . . . . . . . . . . . . . . 23

Boiler Stage Settings . . . . . . . . . . . . 24

Mode . . . . . . . . . . . . . . . . . . . . . 24

Ignition %. . . . . . . . . . . . . . . . . . . 25

Modulation Start % . . . . . . . . . . . . . . 25

Copy Settings - Boiler A Only . . . . . . . . 25

TROUBLESHOOTING. . . . . . . . . . . . 26

SPECIFICATIONS . . . . . . . . . . . . . . 28

Page 3

M4 LAYOUT

Page 3LAARS Modulating Controls M4 & M4-EXT

Program Switch to restrict access to function changes. This switch is covered with Wiring Enclosure.

LED indicates the associated relay status.

OUTPUT RATINGS:

120VAC, 6A RESISTIVE

1A PILOT DUTY, 15A TOTAL

FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz , 30VA MAX

USE COPPER WIRE,

CLASS 1 WIRE ONLY.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

PWR

EQUIPMENT

LISTED

99RA

SYS

CAUTION: RISK OF ELECTRIC SHOCK

More than one disconnect switch may be required

to de-energize the equipment before servicing.

678

SYSTEM

CUR / VLT

GND

CUR / VLTBCUR / VLTCCUR / VLT

CUR / VLT

VLT

GND

VLT

GND

The digital display shows the system status, set point, lead stage <in brackets>, and status of each stage. To view and adjust settings, press the appropriate buttons.

Buttons function is presented on

Bottom Row of display.

FULL MODULATION SEQUENCING

Full Modulation Sequencing Control

---

DO NOT APPLY ANY VOLTAGE

OUTDOOR

TEMP

VLT

TO INPUT TERMINALS

PROVE

SYSTEM

PROVE

/DHW

TEMP

/DHW

TEMP

SHUTDOWN

/SETBACK

EXTENSION

MODULE

RS-485

VLT

RUNPROGRAM

CUR / VLT

GND

VLT

CUR / VLT

GND

120VAC Power

System Output controls pumps, valves, or other system components.

Four N.O. Boiler startup relay outputs. Each is wired in series with each boiler's limit circuit.

Four modulation outputs can be 0-10V,

0-5V, 2-10V, 1-5V, or 4-20ma. Go to Startup Menu to determine the type of

output for each stage.

When connecting Outdoor and System

Sensors, no Polarity is observed.

Prove terminals must be connected

for M4 to operate boilers.

Connect Extension panels to

add additional stages using a 6 pin phone line only (cable provided with M4-Extension).

Page 4

Page 4 LAARS Heating Systems

M4 OVERVIEW

SEQUENCES UP TO 4 FULLY MODULATING STAGES.

The M4 is the perfect control whenever multiple fully modulating stages are required for hydronic heating applications. The M4 controls the on/off and the modulation of each stage to maintain precise system set point control.

PID TYPE LOGIC

The M4’s control algorithms allow it to look at the rate of change in the system. If the system temperature is changing quickly, the M4 will react quickly to adjust the modulating stages’ output. If the system temperature changes slowly, the M4 will make slow and gradual output adjustments. Therefore, the M4 adapts to speciﬁc system requirements and minimizes ﬂuctuations around the set point.

CONTROLS 0-10 V, 0-5 V, 2-10V, 1-5V, OR 4-20 MA MODULATING MOTORS

The M4 is designed to accurately control the output from 0 to 100% of modulation for each of these different types of motors. One M4 can even control a variety of the above different motors.

ONLY ONE SENSOR

When Set Point sensor type is selected, the M4 requires only one sensor located in the common output header of all stages. However, when Reset is selected, an additional Outdoor Sensor is required for Outdoor Reset Ratio input.

DIGITAL DISPLAY OF ALL SYSTEM SETTINGS

The M4’s alphanumeric digital display names each system parameter in simple English and shows its precise value. The easy to follow menu system allows users to quickly make changes to any system setting without having to learn any specialized codes or keyboard commands.

AUTOMATIC ROTATION AMONG STAGES

Rotating the ﬁrst stage to be activated on a call for output promotes even wear on each stage. The M4 has three modes of rotation: Manual, Last On, or Time. The Time rotates the lead stage every selected time period from every hour to every 60 days.

OUTDOOR RESET

The M4 has a hydronic outdoor temperature reset function. This allows the M4 to change the set point based on outdoor temperature. Furthermore, additional settings have been added to ﬁne tune this operation, like Offset, Minimum, and Maximum Water Temperature and night setback schedule.

STANDBY BOILERS

Each of the M4 stages can be conﬁgured as a Standby boiler with an adjustable Standby delay. A boiler can be used as a backup during extended large demand periods.

SYSTEM OUTPUT

In Set Point mode, this output can be used to activate a system pump, combustion air damper, or perform any other function that is required when any stage is active. In Outdoor Reset mode, the System Output will activate whenever the outdoor temperature is below the Outdoor Cutoff setting. A System Prove input checks the status of components activated by the System output before stages can be activated.

STAGING (NORMAL) OR PARALLEL MODULATION

The M4 can stage boilers as needed. That will allow it to increase the modulation on the lead boiler. When the lead boiler reaches its modulation start point adjustment and does not satisfy the load, the M4 will start the next boiler and so on... Moreover, the M4 allows for a parallel mode that can modulate several boilers together as a one large boiler. This mode is useful for boilers with lower water content, which are usually more efﬁcient at lower ﬁring points.

ADD UP TO 16 BOILER STAGE (OPTIONAL)

As a stand-alone, the M4 is designed to control four modulating boilers. However, it has the capability of expanding its control to two extension panels each with six boiler stages. Thus, the M4 can control a total of up to 16 boiler stages.

Page 5

UNDERSTANDING OPERATION CONCEPT

Outdoor Temperature (in °F)

70 605040 20

30 0 -10

10 -20

100

120

110

130

140

150

160

180

170

190

200

210

220

1:3 1:2 1:1.5

1:1.25

1:1

1.25:1

1.5:1

2:1

3:1 4:1

Water Temperature (in °F)

Reset Ratio Curves

    

    

1:4

The M4 has multiple operating modes that satisfy most hydronic systems. It can change the System Set Point based on outdoor temperature (Outdoor Reset) or it can modulate its stages to achieve an adjustable ﬁxed Set Point.

In Outdoor Reset, the M4 controls a hot water heating system to provide a building with comfortable and even heat levels. The M4 varies the temperature of the circulating heating water in response to changes in the outdoor temperature. The heating water temperature is controlled through the modulation of stages.

The M4 also controls the system circulating pump with an adjustable Outdoor Cutoff. When the outdoor temperature is above Outdoor Cutoff, the pump is off and no heating water is circulated through the system. When the outdoor temperature drops below the Outdoor Cutoff, the system pump relay is activated and the heating water circulates through the system. The temperature of the heating water is controlled by the Reset Ratio, Water Offset, and changes with Outdoor temperature.

Page 5LAARS Modulating Controls M4 & M4-EXT

RESET RATIO/OUTDOOR RESET

When a building is being heated, heat escapes through the walls, doors, and windows to the colder outside air. The colder the outside temperature, the more heat escapes. If you can input heat into the building at the same rate that it is lost out of the building, then the building temperatures will remain constant. The Reset Ratio is an adjustment that lets you achieve this equilibrium between heat input and heat loss.

The starting point for most systems is the 1.00 (OD):1.00 (SYS) (Outdoor Air Temperature : Heating Water Temperature) ratio. This means that for every degree the outdoor temperature drops, the temperature of the heating water will increase one degree. The starting point of the curves is adjustable, but comes factory selected at 70

°F Outdoor Temp. and 100°F Water Temp. For example with a 1.00 (OD):1.00 (SYS)

ratio, if the outdoor temperature is 50 the starting point of 70°F. Therefore, the heating water temperature will increase 20° to 120°F.

Each building has different heat loss characteristics. A very well insulated building will not lose much heat to the outside air, and may need a Reset Ratio of 2.00 (OD):1.00 (SYS) (Outdoor:Water). This means the outdoor temperature would have to drop 2 degrees to increase the water temperature 1 degree. On the other hand, a poorly insulated building with insufﬁcient radiation may need a Reset Ratio of 1.00 (OD):2.00 (SYS). This means that for each degree the outdoor temperature dropped the water temperature will increase 2 degrees. The M4 has a full range of Reset Ratios to match any buildings heat loss characteristics.

°F, this means the temperature has fallen 20° from

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130

120

110

Water Temperature

100

70 405060

Outdoor Temperature

110

100

Water Temperature

70 405060

Outdoor Temperature

150

140

130

Water Temperature

120

1:4

-20 Offset

1:1

4:1

1:1

4:1

1:1

4:1

A heating curve that relies not only on Outdoor temperature but also on type of radiation

types of radiation based on average building insulation and heat loss. The contractor can ﬁne tune these adjustments based on the speciﬁc building need.

Type of Radiation in Building Reset Ratio Offset

Radiators (Steel & Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F

Baseboard (Finned copper tube& Cast Iron) 1.00 (OD) : 1.00 (SYS) 0˚F

Radiant (High Mass/Concrete) 4.00 (OD) : 1.00 (SYS) -10˚F

Radiant (Low Mass/Joists) 2.00 (OD) : 1.00 (SYS) -10˚F

Fan Coils & Air Handlers 1.00 (OD) : 1.00 (SYS) 20˚F

will improve heat comfort. The following are suggested initial settings for different

100

70 405060

+20 Offset

Outdoor Temperature

WARNING

When controlling a non condensing boiler directly without the use of a mixing valve, minimum boiler water temperature must be set to boiler manufacturer speciﬁcations. In that case, system temperature must not go below such temperature.

Page 6

Page 6 LAARS Heating Systems

MAKE SURE YOU HAVE THE RIGHT CONTROL

If you need the M4 to do additional tasks that either are not listed or do not know how to conﬁgure them, contact LAARS.

INITIAL SETUP

Setting an Initial Program will ease the conﬁguration of the M4 and will give the opportunity to utilize many of the energy saving features and give more comfortable heat when needed.

The program should consist of the following:

• Selecting the features that your system can utilize,

• Installation: Install the Control, switches and sensors,

• Setting the System Startup,

• Setting the System Settings,

• Setting the Stages

• Adjusting Reset Ratio and Water Offset (In Reset Mode Only)

SELECTING THE SYSTEM FEATURES

The M4 has been designed with Hydronic building heating as the primary purpose. With this in mind, many of the M4 features can be utilized to ease, enhance and improve your system performance. Some of these features are listed in this section.

OUTDOOR RESET OR SET POINT

• The M4 can control the System Temperature either by adjusting the calculated temperature according to the Outdoor Temperature (Outdoor Reset) or by maintaining an adjustable Set Point. The earlier relies on an Outdoor Sensor (supplied with the control) and achieves better fuel savings in addition to better comfort.

NUMBER OF STAGES

• The M4 can be conﬁgured to control up to 4 modulating boilers. It can control up to 16 boiler stages using a maximum of two M4 Extension Panels

MODULATION MODE

•

The M4 can stage boilers using one of two methods. Normal Modulation Mode, allows it to increase the modulation of the lead boiler. When the lead boiler reaches its modulation start point adjustment and does not satisfy the load, the M4 will start the next boiler and so on. This mode targets boilers that can run more efﬁcient at higher modulation rates.

• The Parallel Modulation Mode can modulate several boilers together as a one large boiler. This mode is useful for boilers that are

more efﬁcient at lower ﬁring points.

MODULATING SIGNAL

•

The M4 is designed to accurately control the output from 0 to 100% of modulation for each of these different types of motors. One

M4 can even control a variety of the above different modulation motors.

AUTOMATIC ROTATION AMONG BOILERS

• Rotating the ﬁrst burner to be activated on a call for output promotes even wear on all burners. The M4 has three modes of rotation: Manual, Last-ON, or Time automatically rotating every selected time period from every hour to every 60 days.

STANDBY BOILER

•

Any boiler can be conﬁgured as a Standby boiler. It withholds a speciﬁc boiler from being included in the Lead Rotation. However, the Standby boiler will be ﬁred only as a backup when all other stages combined cannot satisfy the demand and after an adjustable delay period.

SETBACK OR DAY/NIGHT SCHEDULING

Two Setback modes are available for the M4:

• The Day/Night Scheduling provides an adjustable time-based schedule for the Setback.

• The Setback mode uses an external signal to switch the operation of the M4 in and out of setback mode.

Page 7

Page 7LAARS Modulating Controls M4 & M4-EXT

System Run-On

• This feature lets the M4 run the SYS relay for a longer period after the boilers have been turned off. When this relay is used to control a pump, it helps in dissipating the excess heat from the boilers combustion chamber.

INSTALLATION

Each of the M4 or M4-Extension consists of three primary enclosure components.

• The Enclosure Display Module: contains the display, buttons, LEDs and electric wiring terminals. It has two screws to hold it to the base. A program conﬁguration switch, used to adjust M4 settings, is placed above the terminals. This switch is enclosed with the enclosure wiring cover for security. Wiring terminals are of the plug-in type to ease installation and removal.

• The Enclosure Base: contains the holes to mount and hold the control against the wall or any ﬂat surface. All other enclosure components mount on the base. The bottom section of the Enclosure Base contains the wiring chamber with knockouts on the bottom to easy installation.

• The Enclosure Wiring Cover: seals the wires from the external environment. It has two screws to hold it the base and a hole to secure a lock on the wiring enclosure. A plastic web that separates the wiring chamber into high and low volt sections has been provided.

MOUNTING THE ENCLOSURE

• Select a location near the equipment to be controlled.

• The surface should be ﬂat, and be sufﬁciently wide and strong to hold the M4 or M4-Extension.

• Keep the control away from extreme heat, cold, or humidity. Ambient operating temperature is from 20 to 120°F.

• Remove the Enclosure Wiring Cover from the control enclosure by removing the two bottom screws.

• Remove the Enclosure Display Module by removing the middle screws.

• Screw the Enclosure Base to the surface through the upper and lower mounting holes on the back of the enclosure.

• Replace the Enclosure Display Module and replace the middle screws.

• Do not replace the enclosure wiring cover until all wiring is done.

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   

 

  

   

Page 8

Page 8 LAARS Heating Systems

INSTALL THE SENSORS

HEATING SYSTEM SENSOR (HSS) INSTALLATION

LOCATING HSS

• Put the Heating System sensor approximately 10' feet past the last boiler on the common supply header but before any major takeoffs.

• The sensor must be located where it sees the output of all the boiler stages. If a boiler is piped so that the sensor does not see its output, the M4 will not sequence the boilers correctly.

• Only use a Standard Brass Tube sensor (HT #904015-00 or equivalent).

• The sensor wires can be extended up to 500' using a shielded 2-conductor cable (Belden #8760 or equivalent). Do not ground the shield at the sensor but at the panel using one of the terminals marked with an “O”.

• Do not run sensor wires in conduit with line voltage wiring.

IMMERSION HEATING SYSTEM SENSOR (HSS) INSTALLATION

• Install a 3/8"ID 1/2"NPT immersion well (HT #350147-00 or equivalent).

• Insert the sensor probe of the supplied sensor into the well.

STRAP-ON HEATING SYSTEM SENSOR (HSS) INSTALLATION

• Strap the sensor to the pipe using metal clamps. Do not over tighten the clamp.

• Strap pipe insulation around the sensor and pipe.

Immersion Heating System Sensor

Immersion Well

3/8" ID 1/2" NPT

Shield

Heating System

Sensor

Strap-On Heating System Sensor

Common Supply Pipe

Pipe Insulation

Shield

Common Supply Pipe

Sensor Probe

CAUTION

If the HSS can not sense the correct heating system water temperature being supplied to the building, the M4 will not provide comfortable heat levels. Be sure the HSS is located on a main supply pipe which can not easily be isolated from the system.

OUTDOOR SENSOR INSTALLATION

• Only use the LAARS sensor included with the unit.

• Locate the sensor in the shade on the north side of the building. The sensor should never be in direct sunlight.

• Be sure the location is away from doors, windows, exhaust fans, vents, or other possible heat sources.

• The sensor should be mounted approximately 10' feet above ground level.

• Mount the sensor clip base to the outside of the building. Insert the sensor in the middle and snap close the clip on the sensor.

• The sensor wires can be extended up to 500' using shielded 2-conductor cable. Do not ground the shield at the sensor but at the panel using one of the terminals marked with an “O”.

• Do not run sensor wires in conduit with line voltage wiring.

WARNING

The M4 is an operating control only. All boilers must have all safety and limit controls required by code. It is the responsibility of the installer to verify that all the safety and limits are working properly before the M4 is installed.

CAUTION

Determining the proper location for the Outdoor Sensor is very important. The M4 will base the heat on the outdoor temperature information it receives from this location. If the sensor is in the sun, or covered with ice, its reading will be different from the actual Outdoor temperature (OD).

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 

 

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Page 9

Page 9LAARS Modulating Controls M4 & M4-EXT

WIRING

WIRING THE POWER (TERMINALS 1, 2)

• Bring the 120VAC 60Hz power wires through the bottom Knockout of the enclosure.

• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.

• Connect the hot line to terminal marked L.

• Connect the neutral line to the terminal marked N.

• LAARS recommends installing a surge suppressor on the power source to the M4.

WARNING

Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring. LAARS recommends installing a surge suppressor on the power source to the M4.

WARNING

Connect the shield at the control terminal end and cut the shield wire at the sensor

WIRING THE SENSORS

SYSTEM SENSOR WIRING (TERMINALS 27, 28)

• A M4 must be connected to a temperature sensor located in the common header.

• The M4 is designed to be connected to a HT #904015-00 temperature sensor for immersion in a 3/8ID well (HT #350147-00 or equivalent). Contact the factory for additional temperature sensor options.

• Temperature sensor wires can be extended up to 500’ by splicing shielded 2-conductor cable (Belden #8760 or equivalent).

• Temperature sensors have no polarity. Connect the two wires from the sensor to the M4 terminals marked SYSTEM TEMP 27, 28.

• Connect the sensor shield to the circled terminal 28 with one of the sensor wires.

OUTD

Powe

PWR

20VAC

SYS T

Line

ource

TEM

ensor

stem S Sy

Neutral

/DH

led

nsor Shi Se

OUTDOOR SENSOR WIRING (TERMINALS 25, 26)

• When Outdoor Reset is selected, the M4 will vary the system Set Point based on outdoor temperature.

• Whether in Set Point or Outdoor Reset modes, the outdoor sensor can be used as an Outdoor Cutoff. The M4 will disable all Boilers when the outdoor temperature is above the adjustable Outdoor Cutoff temperature. This feature will automatically be activated when an outdoor sensor is connected.

• For an outdoor sensor use a LAARS outdoor sensor (HT #904015).

• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent).

• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the M4 terminals marked OUTDOOR TEMP - 25, 26.

• Connect the shield to the circled terminal 26 with one of the sensor wires.

WIRING THE SHUTDOWN (TERMINALS 31, 32)

• This feature can be used whenever it is desirable to turn off the M4 stage outputs from a remote location or another controller (i.e. EMS input).

• When the Shutdown feature is enabled by closing a dry contact, all active boilers will immediately modulate down to low then off. The lead boiler will remain in low for a Soft-Off period; default setting is 45 seconds, and then turn off.

• The System Output relay will remain active until the System Delay is over and then it will turn off.

• The Shutdown signal must be a dry contact only. No voltage can be placed across the SHUTDOWN terminals.

• Bring the two wires from the dry contact to the terminals marked SHUTDOWN- 31,32.

STEM

led Shi

or s

en S

ETBACK

Shutdown

ign

/DH

OUTD

nsor

doorSe t

TEM

Page 10

Page 10 LAARS Heating Systems

WIRING THE PROVE (TERMINALS 29, 30)

• The Prove feature is provided to check system component operation and must be selected in the Startup Menu.

• A typical use of this feature is to check for ﬂow before ﬁring any boiler.

SYS

EMP

ORO

/SETBAC

/DHW

TEM

• If the PROVE input is open on a call, the M4 will enable only the System Output. All Boiler outputs will be

off when the PROVE input is open.

• A factory-installed jumper provides the System Prove signal. Do not remove the jumper unless it will be

replaced by a System Prove signal or use the terminals for DHW call.

• Bring the two wires from the dry contact to the terminals marked PROVE - 29, 30. No voltage can be placed

across the PROVE terminals

ove Si

gnal

WARNING

The PROVE input can not be used as a safety limit. All equipment must have its own certiﬁed limit and safety controls as required by local codes. If Prove is selected in the startup menu, no boiler stage will start unless Prove terminals are shorted. DO NOT remove the PROVE jumper supplied unless replacing it with a Prove signal.

WIRING THE DOMESTIC HOT WATER CALL DHW (TERMINALS 29, 30)

• DHW can be used to raise system Set Point to 200°F or Maximum Water temperature, whichever is lower.

DHW with or without Priority must be selected in the Startup Menu.

• DHW Call terminals are dry contact N.O. terminals.

• Wire an aquastat or other controls to provide closure on the DHW Call terminals.

• Remove the jumper on the DHW terminals for proper operation.

TEM

SYS

EMP

HW S

ETBACK

ignal

WIRING THE SYSTEM OUTPUT (TERMINALS 3, 4)

System Output Operation in Set Point Mode

• The SYS output relay will energize whenever the outdoor temperature drops below the Outdoor Cutoff or

whenever a boiler output is active. If no outdoor sensor is connected and the last boiler relay has de-energized, the SYS relay will remain energized for a period set by the System Run-On.

• No Boilers will be activated until the prove input is shorted. If a Prove is not required, the factory-installed

jumper should remain connected.

• A typical use of the SYS output is to activate a system pump starter. The pump can run whenever there is a call

for heat. When heat is no longer required, the pump will stay active for an adjustable Pump Run-On delay.

System Output Operation in Reset Mode

• The SYS output relay will energize whenever the outdoor temperature is below the Outdoor Cutoff.

• The SYS will remain constantly energized while the outdoor temperature is below the Outdoor Cutoff.

• When the outdoor temperature rises 2°F above the Outdoor Cutoff, the SYS output will remain energized for

the period set by the System Run-On.

• The SYS output has one Normally Open (N.O.) relay contact.

• The N.O. contacts are dry contacts only. They do not source any voltage.

• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.

• Each N.O. contact is capable of switching 6A resistive at 120VAC.

WIRING THE BOILERS

WIRING THE BOILER OUTPUTS (A TERMINALS 5, 6), (B TERMINALS 7, 8), ...

• Each Boiler output (A through D) has one Normally 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 at 120VAC.

• Total output of all Boilers, including the SYS, must not exceed 15A.

• Wire the N.O. relay contacts in series with the unit’s limit circuit.

• Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.

678

Boiler

rPu

Boiler

Enable tput

SYS

Pump Starte

Page 11

WIRING TO MODULATING MOTORS

WIRING TO 4-20MA MODULATING MOTORS (A TERMINALS 13, 14), (B TERMINALS 16, 17), ...

• The M4 can be equipped to operate up to four 4-20 mA modulating motors.

• The M4-Extension can be equipped to operate up to six 4-20 mA modulating motors.

• The M4 and the M4-Extension sources 24VDC excitation voltage for the 4-20mA signal.

• Wire the (-) from the modulating motor to the boiler terminal on the M4 marked (GND). That is for boiler A,

the modulating (-) terminal will be 13.

• Wire the (+) from the modulating motor to the boiler terminal on the M4 marked (mA). That is for boiler A,

the modulating (-) terminal will be 14.

R / VLT

WIRING THE VOLTAGE MODULATING MOTORS (A TERMINALS 13, 15), (B TERMINALS 16, 18),...

• The M4 Extension can be equipped to operate up to six 0-5V, 0-10V, 1-5V, or 2-10V modulating motors.

• Wire the (GND) from the modulating motor to the boiler terminal on the M4 marked (GND). That is for boiler D, the modulating (GND) terminal will be 22.

• Wire the (V+) from the modulating motor to the boiler terminal on the M4 marked (VLT+). That is for boiler D, the modulating (V+) terminal will be 23.

CONNECTING TO THE M4-EXTENSION PANELS

• The M4 is equipped with a 6-pin phone socket to connect to extension panels.

• The M4-Extension is equipped with two 6-pin phone sockets to connect to M4 and an additional M4-Extension panel.

• Only 6-wire phone cable must be used for proper operation.

• Connection cable is provided as part of the M4-Extension package.

• Phone cables must be of a 6-wire with 6-pin terminals. Phone cables can extend up to 100'.

Boi

Modu

Page 11LAARS Modulating Controls M4 & M4-EXT

CUR / VLT

GND

-20mA

Burner

Motor

ler 4-2

lation Ou

222021

oltage

Motor

oiler

lation

0mA

R / VLT

urner

VLT

GND

V+

olta

M4 Module

SYSTEM

CUR / VLTBCUR / VLTCCUR / VLT

CUR / VLT

GND

VLT

GND

VLT

GND

VLT

RUNPROGRAM

CUR / VLTCCUR / VLT

GND

PWR

OUTPUT RATINGS:

120VAC, 6A RESISTIVE

1A PILOT DUTY, 15A TOTAL

FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz , 30VA MAX

USE COPPER WIRE,

CLASS 1 WIRE ONLY.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

99RA

SYS

CAUTION: RISK OF ELECTRIC SHOCK

More than one disconnect switch may be required

to de-energize the equipment before servicing.

Connecting M4 to

Two M4-Extension

Panels using RS485

FULL MODULATION SEQUENCING

Full Modulation Sequencing Control

---

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

PROVE

SYSTEM

OUTDOOR

PROVE

SYSTEM

OUTDOOR

VLT

GND

VLT

GND

/DHW

TEMP

/DHW

TEMP

---

SHUTDOWN

/SETBACK

M4-Extension A

M4-Ext

FULL MODULATION SEQUENCING EXTENSION

CUS

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

99RA

EXTENSION

MODULE

RS-485

PWR

12E34F56G78H910

Comm

11 12

Power

Ext A

EFGH

CUR / VLT

GND

VLTmA

GND

1514

OUTPUT RATINGS:

120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz, 12VA MAX

Use Copper Conductors Only.

CAUTION:

Risk of Electric Shock.

More than one disconnect switch may be required to de-energize the equipment before servicing.

Ext B

CUR / VLT

GND

VLTmAGND

GND

242322

212019

181716

CUR / VLT

VLTmA

GND

2726

EXTENSION

MODULE

VLTmAGND

RS-485

302916

M4-Extension B

M4-Ext

CUS

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

99RA

PWR

12E34F56G78H910

FULL MODULATION SEQUENCING EXTENSION

Comm

11 12

Power

Ext A

EFGH

CUR / VLT

GND

VLTmA

GND

1514

OUTPUT RATINGS:

120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz, 12VA MAX

Use Copper Conductors Only.

CAUTION:

Risk of Electric Shock.

More than one disconnect switch may be required to de-energize the equipment before servicing.

Ext B

CUR / VLT

GND

VLTmAGND

GND

242322

212019

181716

O P

CUR / VLT

VLTmA

VLTmAGND

GND

302916

2726

EXTENSION

MODULE

RS-485

Page 12

Page 12 LAARS Heating Systems

MENU SEQUENCE

----------- SETTINGS ------------

Season

Set Point

BACK

Winter

70 F

SELECT



-------- SYSTEM STARTUP ------

(START)

to continue

BACK

------------- WARNING ------------

THESE SETTINGS CHANGE PRIMARY

SYSTEM FUNCTIONS.

BACK

-------- ARE YOU SURE? -------

Yes

START

CONTINUE

------------- SEASON --------------

Winter

Summer

BACK

------------ SET POINT ----------



[]

BACK

--------- RESET RATIO ----------

1.00 OD=4.00 Sys

1.00 OD=3.00 Sys

1.00 OD=2.00 Sys



1.00 OD=1.50 Sys

1.00 OD=1.25 Sys

1.00 OD=1.00 Sys

1.25 OD=1.00 Sys

1.50 OD=1.00 Sys

2.00 OD=1.00 Sys

3.00 OD=1.00 Sys

4.00 OD=1.00 Sys

BACK

-------------- OFFSET -------------

[]

BACK

SAVE

------- OUTDOOR CUTOFF -------

[]

BACK

--- MINIMUM WATER TEMP ----

[]

BACK

--- MAXIMUM WATER TEMP ----

[]

BACK

--- SYS= 91 F, 10:57Am ---

BACK



240

SAVE

BACK

---------- SENSOR TYPE ---------

Set Point F

Set Point C Reset F Reset C

BACK

Set Point

------ EMS INPUT MODE -------

Disable

Enable

BACK SAVE

----- PROVE/DHW SHARING ----

Prove

DHW Without Priority DHW With Priority

BACK SAVE

--------- SETBACK MODE --------

Day/Night Schedules

External Signal

SAVE



Reset Options

----- EMS 20ma SETPOINT-----

[]

BACK

------ EMS 4ma SETPOINT------

[]

BACK

------ MODULATION MODE ------

Normal

Parallel

BACK

---------- BOOST MODE ---------

30 Minutes

Disabled

220

120



SAVE

--- OD= 54 F, 11:36Am ---

BACK

------- OUTPUT A TYPE -------4-20ma

0-10v

0-5v 2-10v 1-5v

BACK

------- OUTPUT B TYPE -------4-20ma

0-10v

0-5v

2-10v 1-5v

BACK

--------- SENSOR FAULT --------

All Off

All On

EXIT

SAVE

BACK SAVE





BACK SAVE

Page 13

----------- SETTINGS ------------

Season Winter

Set Point 70 F <System Settings>

BACK SELECT

MAINTENANCE

SYSTEM SETTINGS1

---------- SETTINGS 1 ----------

Gain +0

Lead Rotation Time Purge Delay 0.0min Lag Delay 0min <More Settings>

BACK SELECT

Page 13LAARS Modulating Controls M4 & M4-EXT

---------------- GAIN --------------

[]

BACK SAVE

-------- LEAD ROTATION -------

Manual

Time

Last-On

BACK SAVE

---------- MAINTENANCE ---------

System Trim +0 F

Outdoor Trim +0 F

Soft-Off Delay 45sec <Output Trim> <Configuration>

BACK SELECT

------- SOFT-OFF DELAY --------

sec

[]

BACK SAVE

-- OUTDOOR SENSOR TRIM ----

[]

BACK SAVE

--- SYSTEM SENSOR TRIM ----

[]

BACK SAVE

------ CONFIGURATION 1 ------

v1.00c Reset F Normal Day/Night Schedules All Off

BACK NEXT

------ CONFIGURATION 2 -----A=4-20ma B=0-10v C=0-5v D=2-10v

SYSTEM SETTINGS2

---------- SETTINGS 2 ----------

Standby Time 10min

System Run-On 0min Setback 0 F

Last Stage Hold 0 F Set Time 12:03Pm <Day/Night Schedules>

BACK SELECT

--- DAY/NIGHT SCHEDULES ---

Set Time **:**

Schedule

Day Schedule **:** Night Schedule **:**

BACK SELECT

-------------- SETBACK -----------

[]

BACK SAVE

-------- SYSTEM RUN-ON --------

[]

BACK SAVE

-------- STANDBY DELAY --------

[]

BACK SAVE

min

EXTERNAL SETBACK

--- AUTO ROTATE PERIOD ---

hrs

[]

BACK SAVE

---- MANUAL LEAD STAGE ----

B C D E

BACK SAVE

--------- PURGE DELAY ---------

[]

BACK SAVE

----------- LAG DELAY -----------

[]

BACK SAVE

------ LAST STAGE HOLD ------

[]

BACK SAVE

----- SET PRESENT TIME -----

min

1.0

min

11:**Pm

BACK EXIT

-------- STAGE A TRIM -------Output Trim +0.0 <Prev Stage>

BACK SELECT

-------------- STAGE A -----------

[]

BACK SAVE

OUTPUT TRIM

+0.0

BACK SAVE

CAUTION

To be able to change the M4 settings the Program/Run Switch must be set to Program. The switch is located under the Enclosure Wiring Cover for security. The Enclosure Wiring Cover can be securely closed using a lock.

Page 14

Page 14 LAARS Heating Systems

STARTUP SETTINGS

A good practice after performing any Startup menu modiﬁcations is to

CAUTION

check all operating settings and adjustments to match the new settings.

PROGRAM CHANGE SETTINGS

STARTUP SEQUENCE

Button: MENU/<System Startup>

• When powered, the M4 performs a self-test on its components.

• After the self-test diagnostics have been successfully completed, the M4 will initialize the panel.

• On the ﬁrst power up, the System Startup screen will appear after the initialization is complete. If it doesn’t, the M4 has already been conﬁgured.

• The System Startup menu sets the main parameters like the type of sensor, the type of output, and the modulating mode.

SENSOR TYPE

Set Point °F, Set Point °C, Reset °F, Reset °C Default: Set Point ºF

Button: MENU/<System Startup>/..../Sensor type

• Reset mode is only available if an outdoor sensor is connected to terminals 25 and 26. DO NOT select Reset without an outdoor sensor.

• The same LAARS temperature sensor can display in either °F or °C.

• If °F is selected, all temperatures and settings will be displayed in degrees Fahrenheit and the M4 will operate as a Set Point Control in degrees Fahrenheit.

• If °C is selected, all temperatures and settings will be displayed in degrees Celsius and the M4 will operate as a Set Point Control in degrees Celsius.

• Set point mode does not require an outdoor sensor. If an outdoor sensor is connected in Set Point mode it will be used only as an outdoor cutoff point. That is, to turn the boilers and system pump off.

RUNPROGRAM

-------- SYSTEM STARTUP ------

(START)

to continue

BACK START

---------- SENSOR TYPE ---------

Set Point F

Set Point C Reset F Reset C

BACK SAVE

------ EMS INPUT MODE -------

Disable

Enable

EMS INPUT MODE (AVAILABLE IN SET POINT ONLY)

Disable, Enable Default: Disable

Button: MENU/<System Startup>/..../EMS Input Mode

• This allows the M4 to receive an external set point from an EMS/BMS system.

• You must select the 4mA (min) and 20 mA (max) Set Points in the following screen.

• The 4mA can be set to any temperature between 70ºF to 200ºF.

• The 20mA can be set to any temperature between 90ºF to 240ºF. However, the minimum must be 20ºF higher than the 4mA setting.

• Connect the 4-20mA EMS Control Interface to the M4 RS485 connection.

SELECTING THE OUTPUT TYPE

4-20mA, 0-5V, 0-10V, 1-5V, or 2-10V Outputs Default: 4-20mA

Button: MENU/<System Startup>/..../Output A type/Output B type

• Outputs can be conﬁgured for 4-20mA operation (current) or the voltage range can be selected (0-5V, 0-10V, 1-5V, 2-10V).

• Check the modulating motor to determine its control requirements.

• Select the appropriate Output Type for each of the boilers. The M4 can have a different Output type for each boiler.

BACK SAVE

------ EMS 4ma SETPOINT------

120 F

[]

BACK SAVE

------- OUTPUT A TYPE -------4-20ma

0-10v

0-5v 2-10v 1-5v

BACK SAVE

Page 15

Page 15LAARS Modulating Controls M4 & M4-EXT

SELECTING THE MODULATING MODE

Normal, Parallel Default: Normal

Button: MENU/<System Startup>/..../Modulating Mode

------ MODULATION MODE ------

Normal

Parallel

• Some boilers run more efﬁciently as their modulation increases. For these units, it is more energy efﬁcient to run one unit in high than several units at lower modulation. If your units are of this type, select Normal. This is the recommended setting for typical

BACK SAVE

steel and cast iron boilers.

• There are some units that run more efﬁciently at lower modulation. If it is more energy efﬁcient to run several units at lower modulation than one at high, select Parallel. This is typically used on copper boilers, low mass boilers, or burners with high turndown ratios.

PROVE/DOMESTIC HOT WATER (DHW)

Prove, DHW Without Priority, DHW With Priority Default: Prove

Button: MENU/<System Startup>/..../Prove-DHW Sharing

----- PROVE/DHW SHARING ----

Prove

DHW Without Priority DHW With Priority

• Input Terminals 29 and 30 can be used with either of the above features.

• When Prove is selected, the M4 will not start any boiler stage unless Prove terminals are

BACK SAVE

connected.

• Using those terminals to connect to an aquastat for a Domestic Hot Water call and selecting either of the DHW options will raise the calculated water temperature to the lower of 200°F or Max Water Temperature.

• Domestic hot water without priority allows the SYS relay, mostly controlling a primary system pump, to remain energized during a domestic hot water call (aquastat call on terminals 29 and 30). In Summer or when outdoor temperature is above Outdoor Cutoff, a DHW call will energize the SYS relay. After the DHW call termination, the SYS relay will continue to run for the System Run-On period before turning off.

• However, domestic hot water with priority de-energizes the SYS relay during a domestic hot water call (aquastat call on terminals 29 and 30) for a period of one hour. If after the hour period the DHW call still exist, the SYS relay will energize and the M4 will continue in the higher temperature setting until the domestic hot water call has terminated.

--------- SETBACK MODE --------

SETBACK MODE

Day/Night Schedules, External Signal Default: Day/Night Schedules

Day/Night Schedules

External Signal

Button: MENU/<System Startup>/..../Setback Mode

• The M4 has two levels of heat, a normal/day and a setback/night. The Normal is good for when buildings are occupied and people are active. The Setback/Night holds a lower

BACK SAVE

system temperature and is for when buildings are unoccupied or inactive.

• The Day/Night Schedules provides the user with a Day Time setting for Normal operation and a Night Time setting for Setback.

• The External Signal option switches the M4 to Setback mode when an external signal is received through the Setback terminals. This allows the M4 to be managed by an external device or control to provide setback.

---------- BOOST MODE ---------

BOOST MODE

30 Minutes, Disabled Default: 30 Minutes

30 Minutes

Disabled

Button: MENU/<System Startup>/..../Boost Mode

• If you do not want a Boost simply select Disabled from the Boost Menu.

• Boost is only available if Day/Night Schedules is selected as a Setback option.

BACK SAVE

• The morning Boost is designed to return the building to comfortable ambient temperatures after the cooler Night (Setback) period. The M4 will accomplish this by running elevated water temperatures (will add Setback setting to calculated water temperature) for 30 minutes before the start of the Day schedule setting. That is, if the normal day set point at a speciﬁc outdoor was 145˚F and the Setback setting was 20˚F, the boost will raise the system calculated temperature to 165˚F for 30 minutes before the start of the Day Schedule setting.

--------- SENSOR FAULT --------

SENSOR FAULT

All Off, All On Default: All On

All Off

All On

Button: MENU/<System Startup>/..../Sensor Fault

The Sensor Fault will determine the operating status of all output stages that are set to Auto when a sensor reads Short or Open.

BACK SAVE

Page 16

Page 16 LAARS Heating Systems

RESET MODE

• When All-On is selected, the M4 will turn all boilers On to a 100% when System reads Short or Open and Outdoor is below Outdoor Cutoff. When Outdoor reads Short or Open, the M4 will turn all boilers On to a 100%.

• When All-Off is selected, the M4 will turn all boilers Off when either System or Outdoor sensor reads Short or Open.

SET POINT MODE

• When All-On is selected, the M4 will turn all boilers On to a 100% when the System sensor reads Short or Open.

• When All-Off is selected, the M4 will turn all boilers Off when the System sensor reads Short or Open.

• The Outdoor Sensor Short or Open status will not affect the control operation in Set Point mode.

OPERATING SETTINGS

PROGRAM CHANGE SETTINGS

SEASON

Winter, Summer Default: Winter

Button: MENU/Season

• The M4 will turn all boiler relays off when it is in Summer setting. However, a DHW call will bring boilers back on if needed. The Message Display Line will display Summer to show status.

• When in Winter, the M4 will activate the Sys relay whenever the Outdoor temperature (OD) falls to or below the Outdoor Cutoff setting. In addition, it will begin heating whenever the System temperature (SYS) falls below the Set Point Temperature. The Message Display Line will not display any season information when in Winter.

• When the heating season is over, it is a good practice to switch the M4 to Summer setting. This will allow DHW calls to operate the boilers when needed.

SET POINT

Adjustable 70ºF - 250ºF Default: 70ºF

Button: MENU/Set Point

• The Set point is the temperature value the M4 will use to control the system.

• The M4 will increase, decrease or hold the modulation of the boilers to maintain the system temperature around the Set point.

• The system can be expected to ﬂuctuate around the set point. The amount of ﬂuctuation depends on the Modulation Mode, System Settings, and Stage Settings.

• If the EMS Mode was Enabled, the Set Point will be set by the EMS/BMS system and will be available to be read but not changed on the display.

RUNPROGRAM

------------- SEASON --------------

Winter

Summer

BACK SAVE

CAUTION

DO NOT turn power off to the M4 when heating season is over. If you do so, the battery will run down and will have to be replaced. Instead switch to Summer.

------------ SET POINT ----------

70 F

[]

BACK SAVE

RESET RATIO

Adjustable 1.00ºOD : 4.00ºSys to 4.00ºOD : 1.00ºSys Default: 1.00ºOD : 1.00ºSys

Button: MENU/Set Point

• The Reset Ratio determines how the System water temperature (SYS) will vary with Outside temperature (OD). With any of the ratios, the colder it becomes outside, the hotter the temperature of the system water. The ratios are adjustable from 1.00 (OD):4.00 (SYS) to 4.00 (OD):1.00 (SYS). (See Understanding Operation Concept on page 5)

• With a 1.00 (OD):4.00 (SYS) ratio, the System water temperature (SYS) will increase rapidly as the outside temperature falls, hitting the maximum of 240°F at 24°F outside temperature. With a 4.00 (OD):1.00 (SYS) ratio, the System water temperature (SYS) will increase slowly as the outside temperature falls. Even at -30°F, the system water will only be 125°F, and at 24°F outside, the system water will be 112°F. Such a low Reset Ratio might be used with radiant ﬂoor heating applications.

--------- RESET RATIO ----------

1.00 OD=4.00 Sys

1.00 OD=3.00 Sys

1.00 OD=2.00 Sys

1.00 OD=1.50 Sys

1.00 OD=1.25 Sys

1.00 OD=1.00 Sys

1.25 OD=1.00 Sys

1.50 OD=1.00 Sys

2.00 OD=1.00 Sys

3.00 OD=1.00 Sys

4.00 OD=1.00 Sys

BACK SAVE

Page 17

• With most baseboard heating applications, a 1.00 (OD):1.00 (SYS) setting is a good place to start. With a 1.00 (OD):1.00 (SYS) ratio, for every degree the outside temperature falls, the system water temperature is increased one degree.

• If required: Adjust the RESET RATIO in cold weather. If the ambient building temperatures are too cold in cold weather, move the ratio to a higher selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25 (SYS). If the building temperatures are too warm in cold weather, move the ratio to a lower selection. That is, if 1.00 (OD):1.00 (SYS) was initially selected, change the selection to 1.25 (OD):1.00 (SYS).

130

120

110

Water Temperature

100

70 405060

Outdoor Temperature

Page 17LAARS Modulating Controls M4 & M4-EXT

1:4 1:1

Warmer

Colder

4:1

OUTDOOR CUTOFF TEMPERATURE

------- OUTDOOR CUTOFF -------

Adjustable Off, 20ºF - 100ºF, On Default: 65ºF

Button: MENU/Set Point/Outdoor Cutoff in Set Point Button: MENU/Set Point/Offset/Outdoor Cutoff in Reset

[]

65 F

• If the outdoor sensor is installed, the Outdoor Cutoff screen will automatically appear after the temperature Set Point has been selected.

BACK SAVE

• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the M4 will control and modulate Boilers to hold the calculated temperature.

• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the M4 will turn all boilers off. The System relay will remain energized for the Run-On delay then de-energize. The Message Display Line will display Outdoor Cutoff.

• The Outdoor Cutoff can be set from 20°F to 100°F. In addition, the Setting can be set to ON or OFF. In the ON position, the System Relay will run regardless of the Outdoor temperature (OD) and the burner stages will be active to hold the calculated water temperature. (Note: The lowest water temperature the M4 will circulate is 70°F. If the Outdoor Cutoff is turned ON and the Season is set to Winter, the M4 will circulate at least 70°F water even in the hottest of weather.) In the OFF position, the system pump will always be off and all burner stages will be off.

OFFSET

-------------- OFFSET -------------

Adjustable 50ºF - (-50ºF) Default: 0ºF Button: MENU/Set Point/Offset in Reset only

• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This

[]

+0 F

means that, regardless of the Outdoor temperature (OD), or the Reset Ratio that has been selected, when the Offset setting is changed, that change is directly added to or

BACK SAVE

subtracted from the calculated temperature. For example, if the Set Point temperature was 130°F and the Offset was changed from 0° to 10° (an increase of 10°), then the Set Point temperature would increase to 140°F

• The Offset setting does not change the ratio selection. For instance, with 1.00 (OD):1.00 (SYS) Reset Ratio, the System water temperature (SYS) will always increase one degree for each degree change in the Outdoor temperature (OD). What the Offset does is add or subtract a constant temperature value. (See Understanding Operation Concept)

• If required: Adjust the Water Offset in mild weather. If the ambient building temperatures are too warm in the mild weather, decrease the Water Offset. If the ambient building temperatures are too cold in the mild weather, increase the Water Offset. The rule of thumb for baseboard radiation is to change the Offset 4°F for every 1°F you wish to change the building temperatures. In radiant heat applications, change the Offset 1°F or 2°F for every 1°F you wish to change the building temperature.

MINIMUM WATER TEMP

Adjustable 70ºF - 180ºF Default: 70ºF Button: MENU/Set Point/Offset/Outdoor Cutoff/Minimum Water Temp in Reset only

• The Minimum Water Temperature must be set to the boiler manufacturer’s speciﬁcation. The M4 will calculate the Set Point based on the Outdoor temperature (OD), the Reset Ratio, and the Offset value. The M4 will control all boilers modulation to hold either the Set Point temperature, or the Minimum Water Temperature, whichever is higher.

• The Minimum Water Temperature must be at least 20°F lower than the Maximum Temperature (See next setting).

--- MINIMUM WATER TEMP ----

70 F

[]

BACK SAVE

Page 18

Page 18 LAARS Heating Systems

MAXIMUM WATER TEMP

Adjustable 90ºF - 240ºF Default: 240ºF

Button: MENU/Set Point/Offset/..../Maximum Water Temperature in Reset only

• This is the highest temperature heating water the M4 will circulate through the heating system. It is available in Reset mode only.

• When using a radiation system, it should be set according to the tubing or ﬂoor manufacturer’s speciﬁcation.

• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.

SYSTEM SETTINGS

Button: MENU/<System Settings>

The Settings 1 and Settings 2 menus provide access to adjusting and ﬁne-tuning the system for enhanced comfort and more fuel savings. The M4 behaves differently based on the selected Control Modes (see Startup Settings).

• Gain

• Lead Rotation

• Purge Delay

• Lag Delay

• Standby Time

CAUTION

• System Run-On

• Setback

• Last Stage Hold

• Day/Night Schedules

--- MAXIMUM WATER TEMP ----

240 F

[]

BACK SAVE

---------- SETTINGS 1 ----------

Gain +0

Lead Rotation Time Purge Delay 0.0min

Lag Delay 0min <More Settings>

BACK SELECT

---------- SETTINGS 2 ----------

Standby Time 10min

System Run-On 0min Setback 0 F

Last Stage Hold 0 F Set Time 12:03Pm <Day/Night Schedules>

BACK SELECT

RUNPROGRAM

GAIN

Adjustable -10 to +10 Default: 0

Button: MENU/<System Settings>/Gain

• The Gain adjusts the aggressiveness of the M4 PID logic to control how much modulation is changed when the system temperature is different from the Set Point.

• A Gain of 0 is a good starting point for all systems.

• If during normal load conditions, the system temperature tends to ﬂuctuate signiﬁcantly, decrease the Gain by two numbers (for example, from 0 to -2). Wait for at least 15 minutes before evaluating how the change has affected the system.

• If, during normal load conditions the system temperature tends to remain consistently below the Set Point (or consistently above the Set Point), increase the Gain by two numbers (for example, from 0 to 2). Wait for at least 15 minutes before evaluating how the change has affected the system.

LEAD BOILER ROTATION

Adjustable Manual, Time (1 hr to 60 Days), Last-On Default: Time (24Hours)

Button: MENU/<System Settings>/Lead Rotation

• The Lead Boiler is the ﬁrst boiler brought on when output is required.

• The Lead Boiler can be rotated automatically, manually or based on Last-On. The automatic rotation is recommended.

• The current Lead Boiler is shown in brackets on the main display.

• Only Boilers which are set to Auto Mode can be Lead. Therefore, not all the Boilers may be available when manually selecting a new Lead Boiler.

---------------- GAIN --------------

hrs

[]

BACK SAVE

-------- LEAD ROTATION -------

Manual

Time

Last-On

BACK SAVE

--- AUTO ROTATE PERIOD ---

[]

BACK SAVE

---- MANUAL LEAD STAGE ----

B C D

BACK SAVE

Page 19

Page 19LAARS Modulating Controls M4 & M4-EXT

PURGE DELAY

Adjustable 0.0min to 10.0min Default: 1.0min

Button: MENU/<System Settings>/Purge Delay

• Many boilers go through a purge cycle before they are brought on line.

• When the M4 activates a boiler, it does not start to calculate its output until the Purge Delay is over. This allows the boiler to fully come on line and begin producing output.

• The Purge Delay helps to prevent short cycling of a newly activated burner. Once the burner is activated, it MUST run through the entire Purge Delay period.

• The minimum Purge Delay setting MUST be set to the time required by the boiler manufacturer. Time entry is in 0.1 of a minute (i.e. 1.5min will equal 90 seconds.)

• The Message Display Line will display Purge Delay and the amount of time remaining in the purge.

LAG DELAY

Adjustable 0min to 60min Default: 0min

Button: MENU/<System Settings>/Lag Delay

• The Lag Delay requires the previous stage to remain at 100% modulation for the full period of the Lag Delay before another Stage can be activated. For example, if the Lag Delay was set to 10 minutes, the Lead Stage would need to remain at 100% modulation for a full ten minutes (never backing down to even 99%) before a lag stage could be activated. The Message Display Line will display Lag Delay and the remaining time.

• Set the Lag Delay to 0 min when two or more Stages will generally be needed to hold the load.

• The Lag Delay is useful in installations where one unit should usually have enough output to hold the load unless it fails or load conditions become extreme.

• The Lag Delay overrides the value of the Modulation Point selected for each stage. Regardless of that setting, the previous stage must reach 100% and stay there before another Stage can be activated.

• The full Lag Delay must always elapse regardless of what happens to system temperature. Therefore, set the Lag Delay to 0 min if you want smooth set point control using multiple units.

--------- PURGE DELAY ---------

min

[]

BACK SAVE

1.0

CAUTION

Set Purge Delay as per boiler manufacturer recommendation.

----------- LAG DELAY -----------

min

[]

BACK SAVE

STANDBY TIME

Adjustable 1min to 60min Default: 10min

Button: MENU/<System Settings>/<More Settings>/Standby Time

• The Standby Delay Time only applies to Boilers in Standby Mode.

• A boiler can be set to be a Standby boiler using the Stage Menu.

• A Standby Boiler can only be activated after all the boilers in Auto Mode have run at 100% modulation for the full Standby Time.

• Standby boilers are used for backup or extreme load conditions only. A Standby Boiler can never be a Lead Stage

• The full Standby Delay Time must always elapse regardless of what happens to system temperature. Therefore, shorter Standby Times will result in smoother set point operation in extreme conditions. Longer Standby Times may prevent a Standby Boiler from ﬁring if the other boilers can eventually meet the load, or if the load decreases.

SYSTEM RUN-ON

Adjustable 0min to 360min Default: 0min

Button: MENU/<System Settings>/<More Settings>/System run-On

• The SYS relay will energize whenever the Outdoor temperature (OD) is below the Outdoor Cutoff. When the Outdoor temperature increases 2°F above the Outdoor Cutoff after the last burner relay has de-energized, the SYS relay will stay on for a period set by the System Run-On. This allows the Pump to dissipate the residual heat within the boilers back into the system.

• A common use for the System Run-On is to control a system pump in a heating system. The extra time helps transfer the heat from the boilers to the heating system.

• The System Run-On time should be set based on the size and type of the boilers and pumps. In general, a boiler with low water content and high horsepower will need a longer System Run-On than a boiler with the same horsepower and more water content. (Refer to boiler manufacturer recommendation)

-------- STANDBY DELAY --------

min

[]

BACK SAVE

-------- SYSTEM RUN-ON --------

[]

BACK SAVE

min

Page 20

Page 20 LAARS Heating Systems

SETBACK

Adjustable 0°F to 75°F Default: 0°F

Button: MENU/<System Settings>/<More Settings>/Setback

• The Setback feature can be used to provide the M4 with a lower temperature Set Point when less load is required.

• The lower Set Point will appear on the main display indicating this condition.

• For an example, if the calculated temperature is 180°F and the Setback is 20°F, then when in Setback, the M4 will hold a Set Point of 160°F.

• A typical use for Setback is to provide less system temperature to a building during the night or on the weekends when building is not occupied, but heat is still required.

• The amount of Setback selected is subtracted from the Set Point when a Setback External Signal is received or the Night Time schedule setting started.

• If External Signal is selected as a Setback Mode (See Startup menu), the Setback will not be activated unless a dry contact signal source is wired into the Shutdown/Setback terminals (31 and 32) and the M4 receives a SHORT signal.

• If Day/Night Schedules is selected as a Setback Mode (See Startup menu), the Setback will be activated only when Night Schedule time has started.

-------------- SETBACK -----------

[]

BACK SAVE

CAUTION

When using Soft-Off and Last Stage Hold, the last boiler stage will not turn off until both parameters have elapsed. In this case, Soft-Off will start after the Last Stage Hold.

LAST STAGE HOLD

Adjustable 0°F to 30°F Default: 0°F

Button: MENU/<System Settings>/<More Settings>/Last Stg Hold

• The Last Stage Hold prevents short cycling of the Lead Stage during low load periods.

• In low load conditions, the system might require only 5% of the output of one Stage. When the M4 brings on the Lead Stage, the Set Point is quickly exceeded, and the M4 turns the Lead Stage off.

• To prolong the run time during this type of condition, use the Last Stage Hold setting.

• The M4 will let the system temperature exceed the Set Point by the number of degrees selected, before the Lead Stage is turned off.

• For example, with a Set Point of 160°F and a Last Stage Hold setting of 10°F, the Lead Stage boiler will remain on, at low modulation, until the Set Point reaches 170°F.

• From an efﬁciency standpoint, it is better to overshoot slightly than to short cycle a boiler.

Avoiding Conﬂicting Boiler Limits

• The temperature limits set on the boilers MUST be set considerably higher than the M4’s Set Point for the reasons detailed below.

• The M4 sensor is located in a common header some distance from the boilers.

• As the temperature rises in the header and before reaching the sensor location, energy is dissipated. Therefore, the temperature in the header could be lower than that registered by boiler sensors.

• In addition to the normal drop experienced between the boiler’s temperature and that

read by the M4 sensor, the Last Stage Hold setting must be accounted for. The boiler limit must be set above the Set Point

PLUS the Last Stage Hold PLUS the normal drop experienced in the piping.

• Using the previous example of a 10°F Last Stage Hold with a 160°F Set Point, the boilers’ limits must be set enough over 170°F to prevent the boilers’ internal limits being reached. In this situation, the boiler high limit should be set at approximately 180°F to prevent the difference in boiler temperature vs. header temperature causing erratic operation.

------ LAST STAGE HOLD ------

[]

BACK SAVE

WARNING

The temperature limits set on the boilers must be higher than the M4 Set Point. Read the section at left for details that will prevent erratic system operation.

Page 21

Page 21LAARS Modulating Controls M4 & M4-EXT

DAY/NIGHT SCHEDULES

(Available when "Day/Night Schedules" is selected from the Setback Startup menu option only)

Button: MENU/<System Settings>/<More Settings>/Day/Night Schedules

• The M4 has two levels of heat. The Day level is used when a building is occupied and people are active.

• The Night (Setback) level is used when a building is not occupied, or when people are sleeping. This setting reduces the calculated temperature by the Setback setting. If the Day calculated water temperature was 150˚F and the Setback was 20˚F, the Night Schedule will run at (150˚F - 20˚F) = 130˚F.

• If the Boost feature is being used, it uses the Day Schedule as a Boost ending point. That is, if the Day Schedule is set to start at 6:00AM, the Boost will start 30 minutes prior to the Day setting at 5:30AM. The M4 will then raise the calculated water temperature by the Setback amount. Using the previous example, at 5:30AM the M4 will raise the calculated water to 170˚F (150˚F + 20˚F) until 6:00AM.

--- DAY/NIGHT SCHEDULES ---

Set Time **:**

Day Schedule **:** Night Schedule **:**

BACK SELECT

----- SET PRESENT TIME -----

SET TIME

Button: MENU/<System Settings>/<More Settings>/Set Time Button: MENU/<System Settings>/<More Settings>/<Day/Night Schedules>/Set Time

• Adjust the time by selecting Time from the menu and then scrolling through the hours followed by the minutes. If hours are to be set to PM, scroll through the AM hours to reach the PM hours.

BACK SAVE

11:**Pm

CAUTION

Remember that the battery is the backup for the Time. If no power is supplied to the M4 and there was no battery or battery had no power, time values will be lost and will need to be reset.

HISTORY

Button: MENU/<Histories>

The M4 provides users with a graphical history of the System and Outdoor temperatures for the previous 24 hours. The temperatures are sampled every 12 minutes. That is, readings of both System and Outdoor temperatures are recorded and stored every 12 minutes for the last 24 hours.

• To view the values of speciﬁc time period, use the two middle buttons to scroll to that time and read the upper left temperature.

• The ﬁrst screen will be the System Temperature History. By clicking on the Next button, you'll be able to view the Outdoor Temperature History.

--- SYS= 91 F, 10:57Am ---

BACK

--- OD= 54 F, 11:36Am ---

BACK

EXIT

Page 22

Page 22 LAARS Heating Systems

MAINTENANCE

Button: MENU/<Maintenance>

The Maintenance menu gives access to sensor and outputs trimming and Soft-Off. In addition, you'll have access to view the Startup conﬁguration settings.

CAUTION

SYSTEM & OUTDOOR SENSOR TRIM

Adjustable -5°F to +5°F Default: 0°F

Button: MENU/<Maintenance>/System Trim Button: MENU/<Maintenance>/Outdoor Trim

• The LAARS thermistor type sensors are very accurate, and normally require no calibration. Sometimes it may be desirable to make small adjustments to the displayed value for either the Outdoor temperature (OD) or the System temperature (SYS). The Trim setting can adjust the displayed value by ± 5°F.

• Do not use the Trim setting to make the Outdoor temperature sensor match that reported on the radio or TV. Outdoor temperature can vary widely over a broadcast range. Only trim the outdoor sensor based on an accurate thermometer reading taken where the sensor is located.

---------- MAINTENANCE ---------

System Trim +0 F

Outdoor Trim +0 F Soft-Off Delay 45sec <Output Trim>

BACK SELEC

RUNPROGRAM

--- SYSTEM SENSOR TRIM ----

[]

BACK SAVE

-- OUTDOOR SENSOR TRIM ----

[]

BACK SAVE

SOFT-OFF DELAY

Adjustable 0sec to 60sec Default: 45sec

Button: MENU/<Maintenance>/Soft-Off Delay

• When a stage is no longer needed, the Soft-Off keeps that stage burner in Low Fire prior to turning it off.

• The display will show a percent that is equal to the Ignition % for the stage in Soft-Off delay. That number will blink for the Soft-Off delay period.

• If during the Soft-Off stage delay period the M4 needed that stage to turn back on, the stage will be released from the Soft-Off delay and resume normal operation.

------- SOFT-OFF DELAY --------

sec

[]

BACK SAVE

CAUTION

When using Soft-Off and Last Stage Hold, the last boiler stage will not turn off until both parameters have elapsed. In this case, Soft-Off will start after the Last Stage Hold.

OUTPUT TRIM

Adjustable -5 to +5 Default: 0

Button: MENU/<Maintenance>/Output Trim

• Each of the stages controlled by the M4 has a separate Output Trim setting.

• Output Trim acts as an adjustment to a stage output percent to match the burner motor.

• After adjusting the Output Trim, test the operation to make sure the results match your expectation.

-------- STAGE A TRIM --------

Output Trim +0.0 <Prev Stage>

BACK SELEC

CAUTION

DO NOT use the Output Trim for a Stage unless it is absolutely necessary. Test burner operation and modulation output matching after adjusting the Output Trim.

Page 23

CONFIGURATION

Button: MENU/<Maintenance>/<Conﬁguration>

• This menu option provides a consolidated view of the Startup settings the M4 has been set to.

• Additional stage settings will be available by selecting the NEXT option.

Page 23LAARS Modulating Controls M4 & M4-EXT

------ CONFIGURATION 1 -----v1.00c Reset F Normal

Day/Night Schedules All Off

BACK NEXT

------ CONFIGURATION 2 ------

A=4-20ma B=0-10v C=0-5v D=2-10v

BACK EXIT

DISPLAY

 

 

The M4 display layout provides a variety of information that gives an immediate picture of the operation status. The display shows four boilers at a time. The two middle buttons scrolls the screen to view additional boilers. Moreover, all the information is brightly displayed. It can be viewed in brightly or dimly lit rooms.

• The buttons' functionality changes based on the screen and menu level your in. The buttons' functionality are displayed on a dark background on the screen bottom line.

B 5

  

  

- -

 

 



• Horizontal arrows are to scroll through the available stages.

• Vertical arrows are to scroll through the menu functions when in menus or to change values of settings when in its speciﬁc screen.

DISPLAY BOILER MODULATION STATUS

The M4 boiler modulation status gives immediate access to each boiler status. The following list show all possible boiler status:

• --- Boiler is off due to no call for heat.

• 97% Boiler is modulating at the indicated percentage.

• ON Boiler Stage Mode is set to ON and boiler is ﬁring at 100% (boiler is in bypass).

• OFF Boiler Stage Mode is set to OFF and boiler stage is unavailable or boiler does not exist.

• m95% Boiler Stage Mode is set to Manual and set to the speciﬁed percent.

• C/E Boiler on Extension panel is communicating back to the M4..

DISPLAY MESSAGES

The M4 normal display layout reserved the second line for message indications. The following is a list of the most common Message Display Line information:

• Summer The control is set to Summer. No heat is active.

• Shutdown Active The Shutdown Terminals are Shorted. No boilers will be active.

• Shutdown by EMS The EMS is below 2mA or above 22mA

• DHW Call (171˚F) There is a DHW (Domestic Hot Water) call. The M4 will Raise system Set Point to the indicated

temperature. DHW increases calculated temperature to 200˚F or Max Water Temperature, whichever is lower.

• Purge Delay: 23 The current boiler is in purge cycle and the remaining purge time in seconds is 23.

• Holding Until 150˚F The Lead boiler is in Last Stage Hold. This example shows that the lead stage will turn off when

system temperature reaches 150˚F.

• System Run-On: 46 The System relay is ON for the System Run-On Delay. This example shows that it will remain in

System Run-On for an additional 46 seconds before turning off.

• Waiting for Prove The System relay is ON and the prove terminals are open before the lead boiler relay can energize.

• Prove Failure After boilers have run for a while, Prove signal was opened. The boiler relays will de-energize.

However, the System relay will remain energized.

Page 24

Page 24 LAARS Heating Systems

BOILER STAGE SETTINGS

Button: STAGE/

The Maintenance menu gives access to sensor and outputs trimming and Soft-Off. In addition, you'll have access to view the Startup conﬁguration settings.

• In most installations, all active boiler adjustments are the same, but each can be conﬁgured differently if desired.

• If the Boilers are not set up properly, the M4 operation may appear to be erratic.

• When the STAGE button is depressed, the Boiler A Settings menu will be shown.

• Make all the appropriate settings for Boiler A (See below).

• After completing all the settings for Boiler A (See below), you have the option of copying these settings to all other Boilers. Everything but the Mode -- Auto/Standby/ Manual/Off/On -- will be copied.

• Then select the Next Stage option from the menu to bring up the Boiler B Settings menu and make all the settings. Continue until all boilers have been set.

• If a M4-Extension is connected to the M4, scrolling through stages using the Next and Prev Stage menu options will scroll through the M4-Extension stages as well.

----- STAGE A SETTINGS ----

Mode Off

Ignition % 1% Mode Start % 80% <Prev Stage>

Copy Settings

BACK SELECT

CAUTION

Remember to set the Mode for each stage. For Stages that do not have a boiler, contractor must change their Mode to OFF. Otherwise the M4 will include them in the modulation calculation and rotation. That might have dire effects on system response.

CAUTION

To be able to change the M4 settings, the Program/Run Switch must be set to

RUNPROGRAM

Program. The switch is located under the Enclosure Wiring Cover for security. The Enclosure Wiring Cover can be securely closed using a lock.

MODE

Auto, Standby, Manual, Off, On Default: Auto

Button: STAGE/Mode

• The M4 only controls the modulation of boilers set to Auto or (after a delay) those set to Standby. None of the other settings is recommended for output boilers connected to active units.

• Any boiler without an active unit connected must be set to Off.

• The following list describes the MODE options:

Auto - The M4 will control the boiler’s operation to maintain the desired Set Point. Only Boilers set to Auto can be Lead boilers.

------- STAGE A MODE --------

Auto

Standby Manual Off On

BACK SAVE

RUNPROGRAM

Standby Standby boilers can only be activated when all boilers in Auto have been at 100% modulation for a selectable period of

time. Standby is generally used when you want a speciﬁc boiler to be available in extreme load conditions. Note that a Standby boiler Cannot be a Lead boiler.

Manual The Manual Mode should only be used when testing a boiler. Manual overrides the Prove input. The exact percent of

modulation for a boiler can be set with the Manual mode. Once selected, the unit will immediately turn on and modulate to the selected percentage.

Off Any output Boiler A through D not connected to a physical unit should be set to Off. The Off Mode can also be used to

disable units that are being serviced.

On The On Mode should only be used when testing a boiler. The On Mode overrides the PROVE input. Once set to On the

boiler will immediately start ﬁring and modulate to 100%.

Page 25

Page 25LAARS Modulating Controls M4 & M4-EXT

IGNITION %

Adjustable 1% to 50% Default: 1%

Button: STAGE/Ignition %

• The Ignition Point is the percent of modulation that must be attained before the unit can be activated.

• For most modern power draft units, the Ignition Point should be set at 1%.

• Older units or atmospheric units may require the modulating fuel valve to be open from 20-50% before proper ignition can be attained. Check with the boiler manufacturer if you are in doubt about the minimum position of the fuel valve for ignition.

MODULATION START %

Adjustable 0% to 100% Default: 80%

Button: STAGE/Mod Start %

• The Modulation Start determines at what modulation percent the previous boiler should be for the current boiler to be activated.

• For example, if the Modulation Start for Boiler B is set to 75%, then when Boiler A reaches 75% modulation, Boiler B (if Boiler B is in Auto Mode and is not already on) will be brought on in low ﬁre.

• When modulation is decreasing, the lag unit will remain on in low modulation, until the previous boiler reaches 40% of its Modulation Start point, or 2% above the Ignition Point, whichever is higher.

• Using the same example, as the load decreases, Boiler B would modulate down to low. Boiler A would then modulate down to 30%. Only then would Boiler B turn off.

• If the Lag Delay is set to anything other than 0, a boiler must always go up to 100% modulation before the next boiler is activated. However, the Modulation Start should still be set correctly, because it will be valid when modulation is decreasing.

• The Modulation Start point will generally be set differently based on the Modulating Mode selected.

------------ STAGE A -----------IGNITION POINT

[]

BACK SAVE

------------ STAGE A ------------

MODULATION START

80%

[]

BACK SAVE

COPY SETTINGS - BOILER A ONLY

Button: STAGE/Copy Settings

• If all the active boilers will have the same Ignition Start Point and Modulation Point, they can be set for Boiler A and then copied to the other boilers.

• It is still required to select the Mode for all other boilers. The Mode will not be copied.

IMPORTANT

The Mode MUST be set for each boiler. The Copy Settings command will not set the Mode for Boilers B, C, and D. Only Ignition % and Modulation Start % are copied.

-------- COPY SETTINGS -------

From Stage A

to all other stages

BACK COPY

Page 26

Page 26 LAARS Heating Systems

TROUBLESHOOTING

TEMPERATURE INPUTS

Display shows Sensor OPEN

Check the sensor is connected and the wires are continuous to the M4. Finally follow the

procedure for Incorrect Temperature Display.

Display shows Sensor SHORT

The M4 sees a short across the input terminals. Remove the wires from either the SYSTEM

TEMP or OUT TEMP terminals (whichever is reading SHORT). The display should change to read OPEN. If it doesn’t, the M4 may be damaged.

Display shows an Incorrect Temperature Display

Remove the wires from either the SYSTEM TEMP or OUT TEMP terminals (whichever is

reading incorrectly). The display should change to read OPEN. If it doesn’t, the M4 may be damaged. Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the side chart. If it doesn’t, the sensor may be damaged.

CONTROL OPERATION

No Heat

• (Check Diagram on next page)

Too Much Heat

Check if the control has any of the following:

• Domestic Hot Water call - The M4 will raise the temperature of the system to either 200˚F or Maximum Water Temperature on a DHW call, connected to terminals 29 and 30. Check to see if there is a call for DHW and the length of time it lasts.

• Reset Ratio and Offset - If excessive heat occurs only in certain weather, adjust the Reset Ratio and Offset (See Understanding Operating Concept). If excessive heat occurs year round, reduce the Offset.

• Boiler Mode Settings - The M4 will only modulate boilers their mode is set to Auto or Standby. Check to if any boiler stage is set to Manual or On.

• Control Settings - The Last Stage Hold will allow only the Lead boiler to stay on for an additional number of degrees. If the setting is too high, and only the Lead boiler is on, the system can over heat. Reduce the Last Stage Hold setting.

Too Little Heat

Check if the control has any of the following:

• Reset Ratio and Offset - If reduced heat occurs only in certain weather, adjust the Reset Ratio and Offset (See Understanding Operating Concept). If reduced heat occurs year round, increase the Offset.

Temperature Sensor Chart

TEMPERATURE

(in Degrees °F)

-30 117720

-20 82823

-10 59076

0 42683

10 31215

20 23089

25 19939

30 17264

35 14985

40 13040

45 11374

50 9944

55 8714

60 7653

70 5941

80 4649

90 3667

100 2914

110 2332

120 1879

130 1524

140 1243

150 1021

160 842

170 699

180 583

190 489

200 412

210 349

220 297

230 253

240 217

250 187

Value

(in Ohms)

• Setback and Day/Night Schedule - If reduced heat occurs only during speciﬁc hours, check the Day/Night Schedule and the Setback values. Either reduce the Setback setting or change the Day and Night Schedules.

• Boiler Mode Settings - The M4 will only modulate boilers their mode is set to Auto or Standby. Check to if any boiler stage is set to Manual, Off, or Standby.

Boilers are Short-Cycling

• Lag Delay - Increase the Lag Delay only if all boilers tend to short-cycle.

• Last Stage Hold - Increase the Last Stage Hold only if the lead boiler tends to short-cycle.

System is Overshooting or Undershooting

• Gain - If the system is overshooting reduce the Gain.

• Gain - If the system is undershooting increase the Gain.

Page 27

TROUBLESHOOT - NO HEAT

Page 27LAARS Modulating Controls M4 & M4-EXT

START

The control is in DHW

Priority and is

providing all output to

domestic water.

Does the control have

power?

YES

Is the control in

SUMMER mode?

Is the SYSTEM

Relay AND any of the

Boiler Output Relay

lights ON?

Is the SYSTEM Relay

light ON?

YES

Turn control power

ON.

Select WINTER from

the Season menu.

Does the

Output relays that are

ON have continuity?

Contact Factory for

control troubleshoot.

YES

Check the wiring from control to the boilers and the pump. Check plumbing for heat distribution.

Check SHUTDOWN or

PROVE signal source.

YES

Is the control

display indicates a

SHUTDOWN or PROVE

status?

Is any of the

System or Outdoor

Sensors Short or Open?

YES

Replace the faulty

sensor.

Is the Outdoor

sensor reading above

the Outdoor Cutoff

setting?

YES

Either change the

Outdoor Cutoff setting

or wait for the

Outdoor temperature

to drop below that

setting.

Check control heat

settings for proper

heating Reset Ratio or

Set Point.

Page 28

Page 28 LAARS Heating Systems

Speciﬁcations

Voltage Input: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 VAC 60 Hz

Power Consumption: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 VA Max

Operating Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20°F to 120°F

Operating Humidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20% to 80%

Dimensions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11"W x 9" H x 3 ¾" D

Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 pounds

M4 Speciﬁcations

Lead Stage Rotation: . . . . . . . . . . . . . . . . . . . . . . . . . . Time ( 1 to 1440 Hours (60 days)), Manual, Last-On

Pump Output: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) N.O. S.P.S.T

Boiler Modes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto, Manual, Standby, On, Off

Standby Time: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 60 minutes

Modulating Output Types: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (4) 4-20mA, 0-5V, 0-10V, 1-5V, 2-10V

Output Relay Ratings: . . . . . . . . . (5) 1 Amp inductive, 6Amp resistive at 120 VAC 60 Hz, 15A total for all circuits

Add-On M4-Extension Panels: . . . . . . . . . . . . . . . . . . . . . . . . . up two M4-Extension Panels using RS485

Ignition Point %: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 50%

Modulation Start Point %: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100%

Modulation Modes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Normal or Parallel

Temperature Display: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fahrenheit or Celsius.

Display: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Graphical Alphanumeric (7 rows x 21 char. each)

LED: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) System Output relay, (4) Boiler Output relays

Sensor Ranges: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outdoor temperature sensor - minus 35°F to 250°F

Heating system sensor - minus 35°F to 250°F

Outdoor Cutoff Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20°F to 100°F, ON and OFF

Reset Ratio Range: . . . . . . . . . . . . . . . . . . . . . . (1.00 : 4.00) to (4.00 : 1.00) (Outdoor : System Water)

Offset Adjustment: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . minus -40°F to plus 40°F

Minimum Water Temperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°F to 170°F

Maximum Water Temperature (Reset Only): . . . . . . . . . . . . . . . . . . . . . . . . . 90°F to 240°F

Set Point Temperature Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°F to 250°F

EMS Temperature Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°F to 240°F

Domestic Hot Water: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . with Priority or without Priority

Pump Run-On: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 360 minutes

Purge Delay: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0 to 10.0 minutes

Lag Delay: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 60 minutes

Last Stage Hold: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 30°F

Schedules: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) Day and (1) Night (Setback) settings per day

Night Setback: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°F to 75°F

Power Backup: . . . . . . Lithium coin battery, 100 days minimum 5 year replacement (Maintains Clock in power outages).

External Inputs: . . . . . . . . . . . . . . . . . . . . . . . . . . . . Shutdown Input, and Prove Input. (Dry Contacts Only)

Season: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Winter and Summer.

M4-Extension Speciﬁcations

(Each M4-Extension can add up to (6) additional modulating boilers. A maximum of two M4-Extensions can be added to a

single M4.)

Extension Numbering: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Toggle Switch A or B

Boiler Outputs: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (6) N.O. S.P.S.T.

Modulating Output Types: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (6) 4-20mA, 0-5V, 0-10V, 1-5V, 2-10V

Output Relay Ratings: . . . . . . . . . . . . . . 1 Amp inductive, 6Amp resistive at 120 VAC 60 Hz, 15A total for all circuits

Connection to M4 and another extension: . . . . . . . . Two RS485 connections using 6 wire phone cable (Cable is provided)

800.900.9276 • Fax 800.559.1583 (Customer Service, 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

HTC#059062-00 Rev.A