LAARS M4-LHS Installation Manual

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Installation and Operation Manual

Modulating and Condensing /

Document 4232

M4-LHS

Non-condensing Boiler control

Hybrid Multi-Boiler Control

WARNING

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 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.

HTC# 059295-00 A

Contents

Hybrid Logic Overview

. . . . . . . . . . . . . . . . . . 3

Modulating Logic Overview. . . . . . . . . . . . . . . . 4

Outdoor Reset Concept . . . . . . . . . . . . . . . . . . 5

Control Layout . . . . . . . . . . . . . . . . . . . . . . . 6

Extension Layout . . . . . . . . . . . . . . . . . . . . . . 7

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Make Sure You Have the Right Control . . . . . . . . . 9

Installation . . . . . . . . . . . . . . . . . . . . . . . . . 10

Mounting the Enclosure. . . . . . . . . . . . . . . . . 10

Install the Sensors . . . . . . . . . . . . . . . . . . . . 11

System Sensor Installation . . . . . . . . . . . . . . . . 11

Outdoor Sensor Installation . . . . . . . . . . . . . . . . 11

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Wiring the Power . . . . . . . . . . . . . . . . . . . . . 12

Wiring the Sensors . . . . . . . . . . . . . . . . . . . . 12

Wiring the Shutdown, Tstat, or Setback . . . . . . . . . . 12

Wiring the Prove . . . . . . . . . . . . . . . . . . . . . 13

Wiring the Indirect Domestic Hot Water (DHW) Call . . . . 13

Wiring the System Output. . . . . . . . . . . . . . . . . 13

Wiring the Boilers. . . . . . . . . . . . . . . . . . . . . 14

Wiring Boiler Activation or On/Off Staging Boilers . . . . . 14

Wiring Multi-Stage Boilers . . . . . . . . . . . . . . . . 14

Wiring to Modulating Boilers . . . . . . . . . . . . . . . 14

Wiring the 4-20mA Modulating Boilers . . . . . . . . . . 14

Wiring Voltage Modulating Boilers. . . . . . . . . . . . . 14

Connecting to the Extensions and 4-20mA EMS Interface 15

Connecting to BACnet Interface Module . . . . . . . . . 16

Activate the Battery . . . . . . . . . . . . . . . . . . . 16

HYBRID Startup Menu . . . . . . . . . . . . . . . . . . 17

Modulating Startup Menu . . . . . . . . . . . . . . . . 18

Startup Settings. . . . . . . . . . . . . . . . . . . . . . 19

Program Change Switch Setting . . . . . . . . . . . . . 19

Startup Sequence . . . . . . . . . . . . . . . . . . . . 19

Boiler Type . . . . . . . . . . . . . . . . . . . . . . . . 19

Sensor Type . . . . . . . . . . . . . . . . . . . . . . . 19

EMS Input Mode . . . . . . . . . . . . . . . . . . . . . 19

EMS 4mA and 20mA Set Points. . . . . . . . . . . . . . 20

HYBRID Startup Settings . . . . . . . . . . . . . . . . 20

Switch Set Point . . . . . . . . . . . . . . . . . . . . . 20

Switch Differential . . . . . . . . . . . . . . . . . . . . 20

Switch Delay . . . . . . . . . . . . . . . . . . . . . . . 21

Heavy Load Sequence 2nd Group . . . . . . . . . . . . 21

Condensing and Non-Condensing Boiler Type . . . . . . 21

Condensing and Non-Condensing Boiler Number . . . . . 21

HYBRID Modulating Boiler Settings . . . . . . . . . . 22

Modulating Output Type . . . . . . . . . . . . . . . . . 22

Modulating Mode . . . . . . . . . . . . . . . . . . . . . 22

HYBRID Staging Boiler Settings . . . . . . . . . . . . 22

Staging Output Type . . . . . . . . . . . . . . . . . . . 22

Staging Mode . . . . . . . . . . . . . . . . . . . . . . 22

Modulating Boiler Settings . . . . . . . . . . . . . . . 23

Boiler Number . . . . . . . . . . . . . . . . . . . . . . 23

Modulating Output Type . . . . . . . . . . . . . . . . . 23

Modulating Mode . . . . . . . . . . . . . . . . . . . . . 23

Startup Settings (Continued) . . . . . . . . . . . . . . 24

Prove/Indirect Domestic Hot Water (DHW) Priority . . . . 24

Indirect Domestic Hot Water Set Point . . . . . . . . . . 24

Shutdown/Tstat/Setback Mode . . . . . . . . . . . . . . 24

Boost Mode . . . . . . . . . . . . . . . . . . . . . . . 25

Sensor Fault . . . . . . . . . . . . . . . . . . . . . . . 25

Setting the Control to Factory Defaults . . . . . . . . 25

BACnet MSTP Communication Menu. . . . . . . . . 26

BACnet Mode . . . . . . . . . . . . . . . . . . . . . . 26

BACnet Baud Rate . . . . . . . . . . . . . . . . . . . . 26

MS/TP Address. . . . . . . . . . . . . . . . . . . . . . 26

BACnet ID . . . . . . . . . . . . . . . . . . . . . . . . 26

Operating Settings . . . . . . . . . . . . . . . . . . . . 27

Program Change Switch Setting . . . . . . . . . . . . . 27

Season. . . . . . . . . . . . . . . . . . . . . . . . . . 27

Set Point . . . . . . . . . . . . . . . . . . . . . . . . . 27

Reset Ratio. . . . . . . . . . . . . . . . . . . . . . . . 27

Offset . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Outdoor Cutoff Temperature . . . . . . . . . . . . . . . 30

Minimum Water Temp . . . . . . . . . . . . . . . . . . 30

Maximum Water Temp . . . . . . . . . . . . . . . . . . 30

HYBRID Operating Menu . . . . . . . . . . . . . . . . 28

Modulating Operating Menu . . . . . . . . . . . . . . 29

System Settings . . . . . . . . . . . . . . . . . . . . . 31

Setback . . . . . . . . . . . . . . . . . . . . . . . . . 31

Purge Delay . . . . . . . . . . . . . . . . . . . . . . . 31

System Run-On . . . . . . . . . . . . . . . . . . . . . 31

Lead Boiler Rotation . . . . . . . . . . . . . . . . . . . 32

Standby Time. . . . . . . . . . . . . . . . . . . . . . . 32

Last Stage Hold . . . . . . . . . . . . . . . . . . . . . 32

Lead Stages . . . . . . . . . . . . . . . . . . . . . . . 32

Modulating Boiler Operating Settings . . . . . . . . . 33

Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Lag Delay . . . . . . . . . . . . . . . . . . . . . . . . 33

Soft-Off Delay . . . . . . . . . . . . . . . . . . . . . . 33

Staging Boiler Operating Settings . . . . . . . . . . . 34

Reaction Time . . . . . . . . . . . . . . . . . . . . . . 34

Minimum Runtime . . . . . . . . . . . . . . . . . . . . 34

Day - Night Schedule . . . . . . . . . . . . . . . . . . 36

Set Time . . . . . . . . . . . . . . . . . . . . . . . . . 36

Maintenance . . . . . . . . . . . . . . . . . . . . . . . 36

System & Outdoor Sensor Trim . . . . . . . . . . . . . . 36

Output Modulation Trim. . . . . . . . . . . . . . . . . . 37

Conguration . . . . . . . . . . . . . . . . . . . . . . . 37

Display . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Boiler Status . . . . . . . . . . . . . . . . . . . . . . . 38

Display Modulating Boiler Status . . . . . . . . . . . . . 38

Display Messages . . . . . . . . . . . . . . . . . . . . 38

Boiler Stage Menu . . . . . . . . . . . . . . . . . . . . 38

Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Ignition % . . . . . . . . . . . . . . . . . . . . . . . . 40

Modulation Start % . . . . . . . . . . . . . . . . . . . . 40

Copy Settings - Boiler A Only . . . . . . . . . . . . . . . 40

Troubleshooting . . . . . . . . . . . . . . . . . . . . . 41

Specications . . . . . . . . . . . . . . . . . . . . . . . 43

Hybrid - Outdoor Reset - BACnet Variable list . . . 44 Modulation - Outdoor Reset - BACnet Variable list 45

Modulation - Set Point - BACnet Variable list . . . . 46

BACnet PICS Statement. . . . . . . . . . . . . . . . . 47

Piping and Wiring Diagrams . . . . . . . . . . . . . . 48

Hybrid Piping Diagram . . . . . . . . . . . . . . . . . 48

Hybrid Wiring Diagram . . . . . . . . . . . . . . . . . 49

Modulating Piping Diagram. . . . . . . . . . . . . . . 50

Modulating Wiring Diagram. . . . . . . . . . . . . . . 51

HT# 059295-00 A

M4-LHS Installation and Operation Manual

HYBRID LOGIC OVERVIEW

In response to new advancement in condensing boiler design and size, many applications utilize multiple condensing boilers in addition to the non-condensing boilers. That triggered Laars's design of the M4-LHS. It is intended to manage the two groups of

When Hybrid is selected as the Boiler Type, the M4-LHS will select the lead group based on the Target temperature switching set point. See "Switch Set Point" on page 20. The Condensing group of boilers will be the Lead group when the System Temperature is below the System Target Switching Set Point. However, when the System Temperature rises above the Switching Set Point, the Non-Condensing boiler group will be the lead group and the Condensing Group will be the lag group.

Basically, the M4-LHS will allow the condensing group of boilers to operate as along as the System sensor is below the Switching Set Point. See"Switch Set Point" on page 20. During that period, if additional output boilers are needed, the M4-LHS may energize the Non-Condensing boilers to meet the load depending on the Heavy Load Sequence 2nd Group setting. See"Heavy Load Sequence 2nd Group" on page 21. When less output is required the M4-LHS will de-energize the lag group of boilers prior to de-energizing the lead group of boilers.

To eliminate any short-cycling due to rapid changes in the Target Temperature used in the switching, an adjustable Switching Delay has been incorporated. See"Switch Delay" on page 21.

Each of the condensing and non-condensing groups of boilers can be either modulating or staging. Modulating boilers can be of 4-20mA modulating signal or 0-10V modulating signal. See "Modulating Output Type" on page 23. Staging boilers can be On/Off, 2-Staeg, 3-Stage, or 4-Stage. See "Staging Output Type" on page 22.

For Hybrid settings, See "Boiler Type" on page 19. To set the Condensing and Non-Condensing boiler types See "HYBRID Modulating Boiler Settings" on page 22.

System Temp

140°F

120°F

100°F

SWITCH MODE = Target Temperature

SYSTEM

OD=

F SYS=

145

<<A>> B 100% 52%

NONCOND

CONDCOND

NONCOND

RUNPROGRAM

/ VLT

CUR / VLT

mAGND

GND

910

Target Switch Set Point

SYSTEM

RUNPROGRAM

SYS

CUR

R / VLT

AGND

mAGND

VLT

Above the Switch Set Point

DO NOT APPLY ANY VOLTAGE TO INPUT TERMINALS

SHUTDOW

SIO

XTE

PROVE

OUTDOOR

SYSTEM

TAT

/DHW

MODUL TE

TEMP

CUR / VLT

AGND

-485

Non-Condensing are the Lead Group Condensing are the Lag Group

= 120°F

OD=

F SYS=

145

<<A>> B 100% 52%

Below the Switch Set Point

DO NOT APPLY ANY VOLTAGE TO INPUT TERMINALS

OWN

HUTD

EXTENSION

PRO

OUTDOOR

/TSTAT

/DHW

MODULE

TEMP

EMP

CUR / VLT

/SETBACK

AGND

VLT

-485

3031

Condensing are the Lead Group Non-Condensing are the Lag Group

M4-LHS Installation and Operation Manual

HT# 059295-00 A

MODULATING LOGIC OVERVIEW

The Modulation PID logic is capable of controlling multiple modulating current or voltage boilers. When heat is required, the control

PID activates the lead boiler and starts its purge. See "Purge Delay" on page 31. This is followed by the initiation of its modulation at

the Ignition %. See "Ignition %" on page 40. When additional heat is needed, the control starts to increase the lead boiler modulation

until the Modulation Start % has been reached. See "Modulation Start %" on page 40. Any additional heat requirement starts the lag

boiler purge. While the lag boiler is in purge, the lead boiler resumes its modulation until it reaches full re (100% modulation).

Additional heat requirements triggers the control to increase the lag boiler modulation.

When the M4-LHS PID requires reduced output, it will reduce the modulation of the lag boiler until it reaches its Ignition %. That shall be followed by the reduction of modulation of the lead boiler until it reaches 40% percent of the Modulation Start %. This shall trigger the control to turn off the lag boiler. The control will keep reducing the lead boiler modulation until it reaches its Ignition %. If the Last Stage Hold was activated, the control will hold the lead boiler at the Ignition % until the System Temperature exceeds the Target Set Point by the Last Stage hold setting. See "Last Stage Hold" on page 32.

For Modulating boilers, See "Boiler Type" on page 19. Also, See "HYBRID Modulating Boiler Settings" on page 22.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

OUTDOOR RESET CONCEPT

Outdoor Temperature (in °F)

70 60

40 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

Reset Ratio is Presented as

Outdoor Temp. : Water Temp. Ratio

1:4

The M4-LHS has multiple operating modes that satisfy most hydronic systems. It

changes the System Set Point based on outdoor temperature (Outdoor Reset). The

M4-LHS 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 or sequencing of the stages.

The M4-LHS also controls the system circulating pump with an adjustable Outdoor

Cutoff. When the outdoor temperature is above the 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.

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 Temperature : Heating Water Temperature) ratio. This means that for every degree

the outdoor temperature drops, the temperature of the heating water increases by one degree. The starting point of the curves is adjustable, but comes factory selected at 70°F Outdoor Temperature and 100°F Water Temperature. For example with

a 1.00 (OD):1.00 (SYS) ratio, if the outdoor temperature is 50°F, this means the

temperature has fallen 20° from the starting point of 70°F. Therefore, the heating water temperature shall 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° to increase the water temperature 1 degree. On the other hand, a

poorly insulated building with insufcient 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 increases by 2°. The M4-LHS has a full range of Reset Ratios to match any buildings heat loss characteristics.

A heating curve that relies not only on Outdoor Temperature but also on the type of radiation improves heat comfort. The following are suggested initial settings for different types of radiation based on average building insulation and heat loss. The

contractor can ne tune these adjustments based on the specic 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

M4-LHS Installation and Operation Manual

With a 0° Offset, the Reset curves begin at 100° Water Temperature.

With a -20° Offset, the Reset curves begin at 80° Water Temperature.

With a +20° Offset, the Reset curves begin at 120° Water Temperature.

130

120

110

Water T emp erature

100

70 405060

Outdoor Temperature

110

100

Water Tem peratur e

70 405060

Outdoor Temperature

150

140

130

Water Tem per ature

120

100

70 405060

Outdoor Temperature

1:4 1:1

4:1

1:4

-20 Offset

1:4

1:1

4:1

1:1

+20 Offset

4:1

HT# 059295-00 A

CONTROL LAYOUT

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

99RA

CAUTION

: RISK OF ELECTRIC SHOCK

More than one disconnect switch may be required

PWR

to de-energize the equipment before servicing.

SYS

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.

M4-LHS

SYSTEM

CUR / VLT

GND

CUR / VLT

VLT

CUR / VLT

GND

VLT

GND

HYBRID CONTROL

OD=35

<<A>> B 100% 50%

STAGE MENU

VLT

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

OUTDOOR

TEMP

RUNPROGRAM

CUR / VLT

VLT

GND

SYS=145

SYSTEM

PROVE

TEMP

/DHW

SHUTDOWN

/TSTAT

/SETBACK

EXTENSION

MODULE

RS-485

120VAC Power

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

When connecting the control Outdoor Air

Sensor and System Sensor, no polarity is

observed. Prove terminals must be connected

for control to operate boilers.

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

Four modulation/staging outputs can be

4-20mA or Voltage. Go to Startup Menu

to determine the type of output for each stage.

Connect Extension panels to add

additional stages using a RJ11 cable(cable

provided with Extension) and RJ45-RJ11

Adaptor (Supplied with control) only or add

X-BAC BACnet Interface Module using RJ45

(cable provided with X-BAC Module)

PART NUMBER # CA009200

HT# 059295-00 A

M4-LHS Installation and Operation Manual

EXTENSION LAYOUT

Extension Selection Switch to determine Stage letters and LED colors. Ext-A Stages E - J and all LEDs are Green Ext-B Stages K - P and all LEDs are Red This switch is covered with the Wiring Enclosure.

LED indicates the associated relay status.

PWR

L N

1 2

C US

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

99RA

K M OL N P

3 4F5 6G7 8H9 10I11 12

FULL MODULATION SEQUENCING EXTENSION

Comm

11 12

M4Ext

Power

CAUTION:

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

VLTmA

1514

CUR / VLT

GND

VLTmAGND

181716

Ext B

CUR / VLT

GND

VLTmAGND

212019

Ext A

K ML N

E F G H

CUR / VLT

GND

OUTPUT RATINGS:

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

INPUT RATINGS:

115VAC 60Hz, 12VA MAX

Use Copper Conductors Only.

Risk of Electric Shock.

CUR / VLT

VLTmAGND

GND

242322

O P

I J

CUR / VLT

GND

VLTmA

2726

CUR / VLT

GND

EXTENSION

VLTmAGND

302916

MODULE

RS-485

120VAC Power

outputs. Each is wired in series with each boiler's limit circuit.

4-20mA or Voltage. Go to the control Startup

Menu to determine the type of output for each stage.

M4-LHS Installation and Operation Manual

Six N.O. Boiler startup relay

Six modulation/staging outputs can be

PART NUMBER # CA004400

Connect to any M4-LHS

and additional Extension panels to add

additional stages using a RJ11 cable only

(cable provided with M4Ext).

HT# 059295-00 A

FEATURES

Laars designed the M4-LHS with Hydronic building heating, using both condensing and non-condensing boilers, as the primary purpose. In addition, the M4-LHS is capable of controlling modulating and staging boilers. With this in mind, many of the M4-LHS features can be utilized to ease, enhance, and improve your system performance.

Condensing and Non-Condensing Boilers Can be Modulating or Multi-Stage.

The M4-LHS can operate both modulating and staging boilers. Just specify each of the Condensing and Non-Condensing boiler group type and the M4-LHS activates the groups based on an adjustable set of criteria.

PID Type Logic

The M4-LHS's control algorithms allow it to look at the rate of change in the system. If the system temperature is changing quickly, the M4-LHS reacts quickly to adjust the modulating stages’ output. If the system temperature changes slowly, the M4-LHS shall make slow and gradual output adjustments. Therefore, the M4-LHS adapts to specic system requirements and minimizes uctuations around the set point.

Controls 0-10 V or 4-20 mA modulating Burners

Whenever any of the Condensing or Non-Condensing group type is set to Modulating, the M4-LHS accurately controls the output from 0 to 100% of modulation for each of these different types of motors. Moreover, a single M4-LHS can control multiple modulating burners each with a different modulating signal.

Controls On/Off, 2-Stage, 3-Stage, or 4-Stage Burners

Whenever one of the Condensing or Non-Condensing group Type is set to Staging, the M4-LHS accurately sequences the stages using a PID logic.

Digital Display of all System Settings

The M4-LHS'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 lead stage of each group promotes even wear. The M4-LHS has three modes of rotation: Manual, Last On, or Time. The Time rotates the lead stage every selected period from every hour to every 60 days.

Outdoor Reset or Set Point

The M4-LHS has a hydronic outdoor temperature reset function. This allows the M4-LHS to change the set point based on outdoor

temperature. Furthermore, additional settings have been added to ne tune this operation, like Offset, Minimum, and Maximum Water

Temperature and night setback schedule.

System Output

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. It energizes 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.

Normal or Parallel Modulation

The M4-LHS can stage modulating boilers as needed. In Normal Modulation, it increases the lead boiler modulation until it reaches its Modulation Start percent adjustment. Then, the M4-LHS starts the next boiler and so on. Moreover, the M4-LHS offers a parallel mode that can modulate several boilers together as a single large boiler. This mode is useful when used with condensing boilers as they

run more efcient at lower modulation. Thus, it is better to run several boilers at lower modulation than to run a single boiler at full re.

Add up to 16 Boiler Stages (Optional)

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

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Setback or Day/Night Scheduling

Two Setback modes are available for the M4-LHS:

• The Day/Night Scheduling provides an adjustable time-based schedule for the Setback (only available when Shutdown or Tstat is selected as the Setback/Shutdown Startup option). See "Shutdown/Tstat/Setback Mode" on page 24.

• The Setback mode uses an external signal to switch the operation of the M4-LHS in and out of setback mode (only available when Setback is selected as the Setback/Shutdown Startup option).

Remote Set point (EMS 4-20mA)

By connecting the control to the optional 4-20mA EMS Interface (X-SIG), the control shall be capable of accepting a remote set point.

BACnet MS/TP Communication

An optional BACnet Interface Module (X-BAC) (CA009100) can be used to connect the control to a BACnet MSTP network for remote access.

MAKE SURE YOU HAVE THE RIGHT CONTROL

If you need the M4-LHS to do additional tasks that either are not listed or do not know how to congure them, contact your local Laars representative.

Setting an Initial Program will ease the conguration of the M4-LHS and will give the opportunity to utilize many of the energy saving features while giving 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. See"Installation" on page 10

• Setting the System Startup. See "Startup Settings" on page 19.

• Setting the System Operating Settings. See "Operating Settings" on page 27

• Setting the Stages. See "Modulating Boiler Operating Settings" on page 33. Also, see "Staging Boiler Operating Settings" on page 34

• Adjusting Reset Ratio and Water Offset (In Reset Mode Only). See "Reset Ratio" on page 27

M4-LHS Installation and Operation Manual

HT# 059295-00 A

INSTALLATION

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

• TheEnclosureDisplayModule: contains the control electronic board, display, buttons, LEDs, and electric wiring terminals.

It has two screws to hold it to the base. A program conguration switch, used to adjust the control 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 at 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 ease 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 at and sufciently wide and strong to hold the M4-LHS or the 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 enclosure 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 enclosure middle screws.

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

• When purchasing a padlock for the enclosure, the maximum shank diameter should not exceed ¼"

Enclosure Display Module

Enclosure Wiring Cover Enclosure Base

Hole for optional lock

Mounting Holes

Display Mounting Screws

Wiring Cover

Mounting Screws

HT# 059295-00 A

M4-LHS Installation and Operation Manual

INSTALL THE SENSORS

System

Strap-On

Sensor

Shield

Not connected

Plastic

Tie-Wraps

Around Pipe

Strap-On Sensor

Outdoor Sensor

System Sensor Installation

• Only use the System sensor (CA002500 or equivalent) provided with the unit.

• 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.

• Install a 3/8"ID 1/2"NPT immersion well.

• If installing the system sensor on the supply, insert the sensor in a well with heat paste approximately 5' feet past the boiler loop outlet 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-LHS will not sequence the boilers correctly.

• The sensor can also be installed on the return to the boilers after all major returns

and before any boiler. However, when setting the reset ratio and the offset, the user must consider the temperature drop across the building loop.

WARNING

Use only the System and Outdoor Air sensors included with the control. Do

not use boiler sensors as it will cause operational problems.

Outdoor Sensor Installation

• Only use the Laars Outdoor Air Sensor group included with the unit (CA006500).

• 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.

• Adhere the Outdoor Label provided to the back of the sensor base.

• Use the Enclosure Base bottom knockout for the conduit. Use the locknut to hold

the conduit and enclosure base together. Screw the cover to the base.

• If screws are used to afx the enclosure to the wall, make sure to seal around the

sensor and wall except from the bottom.

• The sensor wires can be extended up to 500' using shielded 2-conductor cable (#18/2). Do not ground the shield at the sensor but at the control using the

terminal marked with an “O”.

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

Immersion Heating System Sensor

Immersion Well

3/8" ID 1/2" NPT

Shield

Heating System

Sensor

Common Supply Pipe

Sensor Probe

ALERT

If the HSS can not sense the correct water

temperature, the M4-LHS will not provide

comfortable heat levels.

Seal around

sensor and wall

Outdoor Sensor snap-in location

Mounting

screws

location

Outdoor

drip-hole

Outdoor Label

on back of Sensor

Shield

not connected

ALERT

Determining the proper location of the Outdoor Sensor is very important. The M4-LHS 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).

M4-LHS Installation and Operation Manual

Conduit

HT# 059295-00 A

WIRING

SYSTEM

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

GND

VLT

SYS

CUR / VLT

GND

VLT

GND

VLT

GND

VLT

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

CUR / VLTBCUR / VLTCCUR / VLT

PROVE

/DHW

SHUTDOWN

/SETBACK

FOR ALL CIRCUITS

120VAC, 6A RESISTIVE

OUTPUT RATINGS:

1A PILOT DUTY, 15A TOTAL

115VAC 60Hz , 30VA MAX

INPUT RATINGS:

USE COPPER WIRE, CLASS 1 WIRE ONLY.

CAUTION

: RISK OF ELECTRIC SHOCK More than one disconnect switch may be required to de-energize the equipment before servicing.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

99RA

/TSTAT

M4-LHS

HYBRID CONTROL

RS-485

EXTENSION

MODULE

SHUTDOWN

/SETBACK

/TSTAT

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

EXTENSION

MODULE

PROVE

/DHW

SHUTDOWN

/SETBACK

/TSTAT

RS-485

EXTENSION

MODULE

• All wiring must enter the enclosure through the bottom knockouts.

• Class 1 voltage wiring must utilize a different knockout and conduit from any Class 2 voltage wiring.

Wiring the Power

(Terminals 1, 2)

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

• 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-LHS.

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-LHS.

Wiring the Sensors

WARNING

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

To avoid operational problems, use only the System and Outdoor Air sensors included with the control.

System Sensor Wiring

(Terminals 27, 28)

• A M4-LHS must be connected to a System Temperature sensor (CA002500 or equivalent) located in the common header. The sensor must be inserted in a 3/8 ID well using heat paste.

• Temperature sensor wires can be extended up to 500’ by splicing its wires with a shielded 2-conductor cable (Belden #8760 or equivalent (#18/2)).

• Temperature sensors have no polarity. Connect the two wires from the sensor to the M4-LHS terminals marked

SYSTEM TEMP 27, 28.

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

Outdoor Sensor Wiring

(Terminals 25, 26)

• The M4-LHS will vary the system Set Point based on outdoor temperature. In addition, the Outdoor Air Sensor group (CA006500) is used as an Outdoor Cutoff. The M4-LHS will disable all boilers when the outdoor temperature is above the adjustable Outdoor Cutoff temperature.

• For an outdoor sensor use the outdoor sensor provided.

• The sensor wires can be extended up to 500’ using shielded 2-conductor cable (Belden #8760 or equivalent (#18/2)).

• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the M4-LHS terminals marked

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

OUTDOOR TEMP - 25, 26.

Wiring the Shutdown, Tstat, or Setback

(Terminals 31, 32)

• The Shutdown will be available when selected as the Shutdown/Tstat/Setback mode from the Startup menu. See

• The Shutdown feature can be used whenever it is desirable to turn off the M4-LHS stage outputs from a remote

• The Tstat option, when selected from the Shutdown/Tstat/Setback startup menu, offer the capability of controlling

• The thermostat will send the M4-LHS a call for heat by shorting terminals 31 and 32.

"Shutdown/Tstat/Setback Mode" on page 24. This will provide the user with an adjustable Day/Night Schedule. See "Day - Night Schedule" on page 36.

location or another controller (i.e. EMS input).

the operation of the M4-LHS based on a thermostat input. This will provide the user with a adjustable Day/Night Schedule.

PWR

Line

Neutral

120VAC

Power Source

SYSTEM

TEMP

System Sensor

OUTDOOR

TEMP

Outdoor Sensor

SHUTDOWN

/TSTAT

/SETBACK

Shutdown,

T-Stat, or

Setback Signal

PROVE

/DHW

Sensor Shield

SYSTEM

TEMP

Sensor Shield

HT# 059295-00 A

M4-LHS Installation and Operation Manual

• When the Shutdown input is enabled by closing the dry contact, or when the Tstat input is disabled by opening the

RS-485

EXTENSION

MODULE

RS-485

EXTENSION

MODULE

SYSTEM

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

GND

VLT

CUR / VLT

GND

VLT

GND

VLT

GND

VLT

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

CUR / VLTBCUR / VLTCCUR / VLT

PROVE

/DHW

SHUTDOWN

/SETBACK

FOR ALL CIRCUITS

120VAC, 6A RESISTIVE

OUTPUT RATINGS:

1A PILOT DUTY, 15A TOTAL

115VAC 60Hz , 30VA MAX

INPUT RATINGS:

USE COPPER WIRE, CLASS 1 WIRE ONLY.

CAUTION

: RISK OF ELECTRIC SHOCK More than one disconnect switch may be required to de-energize the equipment before servicing.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

99RA

/TSTAT

M4-LHS

HYBRID CONTROL

dry-contact, all active modulating boilers will immediately modulate down to low for the Soft-Off period, then turn off. All staging boilers will turn off immediately.

• The System Output relay will remain active until the System Run-On Delay expires and then it will turn off.

• When Setback is selected in the Startup, a BMS/EMS or external clock can provide a Setback signal using these

input terminals. See "Shutdown/Tstat/Setback Mode" on page 24. No Day/Night Schedule will be available when Setback is selected from the Shutdown/Tstat/Setback mode in the Startup menu.

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

• The signal must be a dry contact only. No voltage can be placed across the SHUTDOWN/TSTAT/SETBACK

terminals.

Wiring the Prove

(Terminals 29, 30)

• The Prove feature checks system component operation and must be selected in the Startup Menu from the Prove/ DHW Sharing menu. See "Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24.

• A typical use of this feature is to check for pump ow or combustion air damper status before ring any boiler.

• If the PROVE input is open on a call for heat, the M4-LHS enables 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 is replaced with a System Prove signal or these terminals are to be used for DHW call input.

• Bring the two wires from the dry contact to the terminals marked PROVE - 29, 30.

• Prove Input terminals can accept a dry-contact signal only. No voltage can be placed across these terminals.

SHUTDOWN

PROVE

/DHW

Prove Signal

/TSTAT

/SETBACK

WARNING

The PROVE input cannot 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 Indirect Domestic Hot Water (DHW) Call

(Terminals 29, 30)

• DHW can be used to raise system Set Point to the DHW Set Point as well as manage the System Pump according to the DHW Priority setting. One of the DHW options must be selected from the Prove/DHW Sharing Startup menu. See "Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24.

• Remove the existing jumper and wire an aquastat or a control to provide dry-contact closure to the DHW Call - 29,

30 terminals.

• DHW Call terminals can accept dry contact signals only. No voltage can be placed across these terminals.

Wiring the System Output

(Terminals 3, 4)

• The SYS output relay will energize and remain constantly energized whenever 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 then de-energize. See "System Run-On" on page 31.

• In addition, the System output will energize during summer DHW calls when DHW No Priority is selected. See "Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24.

• The SYS output has one Normally Open (N.O.) relay contact rated for (1/8 HP).

• 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.

PROVE

/DHW

Indirect

DHW Signal

SYS

System Pump

or Pump Starter

SHUTDOWN

/TSTAT

/SETBACK

M4-LHS Installation and Operation Manual

HT# 059295-00 A

Wiring the Boilers

SYSTEM

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

GND

VLT

CUR / VLT

GND

VLT

GND

VLT

GND

VLT

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

CUR / VLTBCUR / VLTCCUR / VLT

PROVE

/DHW

SHUTDOWN

/SETBACK

FOR ALL CIRCUITS

120VAC, 6A RESISTIVE

OUTPUT RATINGS:

1A PILOT DUTY, 15A TOTAL

115VAC 60Hz , 30VA MAX

INPUT RATINGS:

USE COPPER WIRE, CLASS 1 WIRE ONLY.

CAUTION

: RISK OF ELECTRIC SHOCK More than one disconnect switch may be required to de-energize the equipment before servicing.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

99RA

/TSTAT

M4-LHS

HYBRID CONTROL

SYSTEM

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

GND

VLT

CUR / VLT

GND

VLT

GND

VLT

GND

VLT

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

CUR / VLTBCUR / VLTCCUR / VLT

PROVE

/DHW

SHUTDOWN

/SETBACK

CAUTION

: RISK OF ELECTRIC SHOCK More than one disconnect switch may be required to de-energize the equipment before servicing.

/TSTAT

M4-LHS

HYBRID CONTROL

SYSTEM

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

VLT

GND

VLT

GND

VLT

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

CUR / VLTBCUR / VLTCCUR / VLT

PROVE

/DHW

SHUTDOWN

/SETBACK

/TSTAT

M4-LHS

HYBRID CONTROL

RUNPROGRAM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

RS-485

TEMP

OUTDOOR

TEMP

SYSTEM

EXTENSION

MODULE

PROVE

/DHW

SHUTDOWN

/SETBACK

/TSTAT

HYBRID CONTROL

• When wiring Condensing and Non-Condensing boilers make sure that the Condensing boilers use the rst

stages and the Non-Condensing boilers use the following stages. That is, if the installation had two Condensing Modulating boilers and two Non-Condensing Staging On/Off boilers, Stage A and B must be used by the Condensing boilers while Stage C and D must be used by the Non-Condensing boilers.

Wiring Boiler Activation or On/Off Staging Boilers

(A Terminals 5, 6), (B Terminals 7, 8), ...

• Each boiler output has a Normally Open (N.O.) dry-contact relay. They do not source any power.

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

• Note that some modulating boilers may not require the use of these outputs.

SYS

Boiler

Boiler Enable

Output

678

Wiring Multi-Stage Boilers

(For Staging Boiler Types Only) See Page 19

• Each stage on a multi-stage boiler must use one of the N.O. relays.

• Note that on the display of the M4-LHS each multi-stage boiler will

OD=55oF SYS=142

<<AB>> CD HI LOW

consist of a multiple letters.

• Each stage output has one Normally Open (N.O.) relay contact that

does not source any power.

STAGE ◄ ► MENU

Multi-Stage Boiler

WARNING

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

Wiring to Modulating Boilers

The M4-LHS can modulate any combination of current or voltage boiler signals. See "Modulating Output Type" on page 23. Some modulating boilers may require the use of the stage output relays in addition to the modulating output.

WARNING

The Modulating Output Type must be set to match the boiler modulating

signal prior to wiring the boiler signal to avoid control or equipment damage.

Wiring the 4-20mA Modulating Boilers

(A Terminals 13, 14), (B Terminals 16, 17),...

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

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

• The M4-LHS and the Extension sources excitation voltage for the

4-20mA signal.

• Wire the (-) from the boiler modulating motor to the (GND) terminal

on the M4-LHS. That is for boiler A, the modulating (GND) terminal will be 13.

• Wire the (+) from the boiler modulating motor to the (mA+) terminal

on the M4-LHS. That is for boiler A, the modulating (mA+) terminal will be 14.

OD=55oF SYS=142

<A> B 80% 50%

STAGE ◄ ► MENU

Modulating Boiler (Modulating

Boiler Type)

Low

High

2-Stage Boiler

CUR / VLT

VLT

GND

4-20mA

Boiler 4-20mA

Modulation Output

Burner

Motor

GND

Wiring Voltage Modulating Boilers

(A Terminals 13, 15), (B Terminals 16, 18),...

• The M4-LHS can operate up to four 0-10V modulating motors.

• The Extension can operate up to six 0-10V modulating motors.

• Wire the (GND) from the boiler modulating motor to the (GND) terminal on the M4-LHS. For boiler D, the modulating (GND) terminal is be 22.

• Wire the (VLT+) from the boiler modulating motor to the (VLT+)terminal on the M4-LHS. For boiler D, the modulating (VLT+) terminal is be 23.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

CUR / VLT

VLT

GND

Voltage

Burner

Motor

Boiler Voltage

Modulation Output

V+

Connecting to the Extensions and 4-20mA EMS Interface

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

RUNPROGRAM

ALERT

To set the Extension to a specific letter, remove the wiring cover and switch the Ext A/Ext B to the

desired letter. DO NOT set both extensions to the same letter to avoid errors.

• The M4-LHS is equipped with a RJ45 socket and a RJ45 to RJ11 Adaptor to connect to extension panels and X-SIG 4-20mA EMS

Interfaces. The Extension is equipped with two RJ11 sockets. It comes packaged with a RJ11 cable to connect to M4-LHS and an

additional Extension. Use the RJ45 to RJ11 Adaptor on the M4-LHS.

• The order in which the control, the extensions, and the interface are wired is not observed.

• Set each Extension to a different letter (EXT-A or EXT-B). The M4-LHS assigns the stage letters based on the extension letter

selected.

• Extension-A operates stages (E - J) and all the LEDs are Green. However, Extension-B operates stages (K - P) and all the LEDs

are Red. .

• Congure the Modulating and Sequencing Output Types after connecting the Extension panels to be able to congure their outputs.

See "Boiler Type" on page 19

• Use the 6-wire RJ11 cable supplied with the extension for proper operation.

M4-LHS

SYSTEM

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

CAUTION: RISK OF ELECTRIC SHOCK

LISTED

More than one disconnect switch may be required

99RA

to de-energize the equipment before servicing.

SYS

PWR

SYS

PWR

SYSTEM

CUR / VLT

VLT

GND

VLT

GND

VLT

4-20 mA EMS

4-20mA INPUT

SignalGND

EMS/BMS Temperature Set PointInput

EMS/BMS Sources Excitation Voltage

CONDENSING AND NON-CONDENSING

Full Modulation Sequencing Control

SYS=145oF

OD=35

<<A>> B 100% 50%

STAGE MENU

DO NOT APPLY ANY VOLTAGE

RUNPROGRAM

CUR / VLT

VLT

GND

VLT

GND

VLT

RJ45 to RJ11

Adaptor

TO INPUT TERMINALS

SYSTEM

OUTDOOR

SYSTEM

OUTDOOR

TEMP

X SIG

RS485

EXTENSION

CONNECTORS

(-) (+)

PROVE

/DHW

RJ11

SHUTDOWN

SHUTDOWN /SETBACK

/SETBACK

M4-Extension A

M4-Ext

FULL MODULATION SEQUENCING EXTENSION

Power

Comm

EXTENSION

/TSTAT

MODULE

RS-485

PWR

L N

1 2

K M OL N P

3 4F5 6G7 8H9 10I11 12

13114

Ext A

K ML N

E F G H

CUR / VLT

VLTmA

GND

1716

CAUTION:

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

Ext B

CUR / VLT

GND

VLTmAGND

GND

201916

232219

OUTPUT RATINGS:

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

INPUT RATINGS:

115VAC 60Hz, 12VA MAX

Use Copper Conductors Only.

Risk of Electric Shock.

O P

I J

CUR / VLT

VLTmAGND

VLTmA

GND

262522

2928

CUR / VLT

GND

EXTENSION

MODULE

VLTmAGND

RS-485

323116

RJ11

Each Extension Panel or 4-20mA EMS

Interface comes with Connection Cable.

M4-Extension B

M4-Ext

PWR

L N

1 2

K M OL N P

3 4F5 6G7 8H9 10I11 12

FULL MODULATION SEQUENCING EXTENSION

Power

Comm

Ext A

K ML N

E F G H

CUR / VLT

VLTmA

GND

1716

13 14

CAUTION:

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

Ext B

CUR / VLT

GND

VLTmAGND

GND

201916

232219

OUTPUT RATINGS:

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

INPUT RATINGS:

115VAC 60Hz, 12VA MAX

Use Copper Conductors Only.

Risk of Electric Shock.

O P

I J

CUR / VLT

VLTmAGND

VLTmA

GND

262522

2928

CUR / VLT

GND

EXTENSION

MODULE

VLTmAGND

RS-485

323116

RJ11

M4-LHS Installation and Operation Manual

HT# 059295-00 A

Connecting to BACnet Interface Module

• The M4-LHS can communicate to BACnet MSTP networks when used the X-BAC BACnet Interface Module (CA009100). The module must be purchased separately.

• The BACnet Interface Module comes with an RJ45 cable.

• Both the M4-LHS and the BACnet Interface Module are equipped with a RJ45 socket (RS485) to connect to communicate to each

other.

• The Interface BACnet Module must be wired to the BACnet MSTP network using the RS485 terminals A, GND, and B.

• If both an extension panel and the BACnet Interface Module are to be used, connect the RJ11 socket on the BACnet Interface

Module to the extension.

• Set the BACnet parameters. See "BACnet MSTP Communication Menu" on page 26.

X-BAC

BACnet Interface Module

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

99RA

CAUTION

: RISK OF ELECTRIC SHOCK More than one disconnect switch may be required to de-energize the equipment before servicing.

SYS

M4-LHS

RUNPROGRAM

CUR / VLT

GND

CUR / VLT

VLT

GND

VLT

GND

HYBRID CONTROL

CUR / VLT

VLT

GND

VLT

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

OUTDOOR

SYSTEM

PROVE

TEMP

/DHW

SHUTDOWN

/TSTAT

/SETBACK

MSTP

A GND B

1 2 3

B (-)

A (+)

EXTENSION

MODULE

RS-485

Ground

To BACnet

MSTP

PRODUCT

COMM

RJ45 Cable

RS485

RJ45 RJ11

RJ45

RJ45 Communication Cable

Extension

M4Ext

PWR

L N

1 2

K M OL N P

3 4F5 6G7 8H9 10I11 12

FULL MODULATION SEQUENCING EXTENSION

Comm

13 14

Power

Ext A

K ML N

E F G H

CUR / VLT

VLTmA

GND

1716

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

201916

I J

CUR / VLT

VLTmAGND

GND

232219

262522

O P

CUR / VLT

VLTmA

GND

2928

VLTmAGND

323116

RJ11

ACTIVATE THE BATTERY

• The battery enables to control to maintain the clock time.

• Unscrew and remove the Enclosure Display Module to reveal the back of the control CPU Board.

• Remove the plastic strap that covers the battery. The battery holder contacts should be touching the battery. The control has a coin Lithium battery (CR2032) that is used to

maintain the control's time during power outages. This battery can maintain the clock for up to a total of 100 days.

EXTENSION

MODULE

RS-485

RJ11 Extension Cable

Battery

ALERT

Do not install the battery unless you plan to keep the control continuously powered. If the

control has no power, the battery will lose its charge in 100 days.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

HYBRID STARTUP MENU

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

Season Winter

System Target 140 <System Settings> <Maintenance> <System Startup>

BACK ▲ ▼ SELECT

-EMS 20ma SETPOINT-

220

[ ]

BACK ▲ ▼ SAVE

--- SWITCH DELAY ---

0.5Hour

[ ]

BACK ▲ ▼ SAVE

Page 21

HEAVY LOAD

-SEQUENCE #2 GROUP-

Yes

BACK ▲ ▼ SAVE

Page 22

CONDENSING

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

Page 21

NON-CONDENSING

---- BOILER TYPE ----

Modulating

Staging

BACK ▲ ▼ SAVE

NON-CONDENSING

-- BOILER NUMBER --

[ ]

BACK ▲ ▼ SAVE

Page 24

- SETBCK/SHUTDOWN -

Shutdown/Disable

Tstat/Enable Setback

BACK ▲ ▼ SAVE

Shutdown

Page 25

--- BOOST MODE ---

30 Minutes

Disable

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

or Tstat

Page 20Page 21

Page 21

Page 24

Page 25

Setback

-- ARE YOU SURE? --

Yes

BACK ▲ ▼ SAVE

-EMS 4ma SETPOINT -

[ ]

BACK ▲ ▼ SAVE

--- SWITCH DIFF ---

[ ]

BACK ▲ ▼ SAVE

CONDENSING

---- BOILER TYPE ----

Modulating

Staging

BACK ▲ ▼ SAVE

CONDENSING

-- OUTPUT B TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

NON-CONDENSING

-- OUTPUT C TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

- DHW SETPOINT -

180

[ ]

BACK ▲ ▼ SAVE

--- SENSOR FAULT ---

All Off

All On

BACK ▲ ▼ SAVE

Page 19

--- BOILER TYPE ---

Modulation

Hybrid

Yes

BACK ▲ ▼ SAVE

Page 19Page 20

--- SENSOR TYPE ---

Reset oF

Reset

4-20mA EMS

BACK ▲ ▼ SAVE

Reset

Page 20

- SWITCH SETPOINT -

150

[ ]

BACK ▲ ▼ SAVE

Page 21

CONDENSING

-- BOILER NUMBER --

[ ]

BACK ▲ ▼ SAVE

Page 23

-- OUTPUT A TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

Page 22

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

Page 24

PROVE/DHW SHARING

Prove

DHW Priority DHW No Priority No Priority (Summer)

BACK ▲ ▼ SAVE

All DHW Options

Page 26

--- BACNET MODE ---

Disable

Enable

BACK ▲ ▼ SAVE

Modulating

CONDENSING

NON-CONDENSING

HT# 059295-00 A

MODULATING STARTUP MENU

Page 19

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

Season Winter

System Target 140

F <System Settings> <Maintenance> <System Startup>

BACK ▲ ▼ SELECT

Page 20

-EMS 4ma SETPOINT -

[ ]

BACK ▲ ▼ SAVE

-EMS 20ma SETPOINT-

220

[ ]

BACK ▲ ▼ SAVE

ALERT

To be able to change the M4-LHS

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 secured using a lock.

-- ARE YOU SURE? --

Yes

BACK ▲ ▼ SAVE

- EMS INPUT MODE -

Disable

Enable

BACK ▲ ▼ SAVE

Disable

Page 23 Page 23

Set Point

-- BOILER NUMBER --

[ ]

BACK ▲ ▼ SAVE

Page 24

PROVE/DHW SHARING

Prove

DHW Priority DHW No Priority No Priority (Summer)

BACK ▲ ▼ SAVE

All DHW

Options

Page 24

- DHW SETPOINT -

180

[ ]

BACK ▲ ▼ SAVE

--- BOILER TYPE ---

Modulation

Hybrid

BACK ▲ ▼ SAVE

Page 19

-- SENSOR TYPE --

Reset oF

Reset

C Set Point oF Set Point oC

BACK ▲ ▼ SAVE

OUTPUT A TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

Page 22

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

Page 25

- SETBCK/SHUTDOWN -

Shutdown/Disable

Tstat/Enable Setback

BACK ▲ ▼ SAVE

Shutdown

Setback

Page 25

--- SENSOR FAULT ---

All Off

All On

BACK ▲ ▼ SAVE

Page 26

Page 25

--- BOOST MODE ---

30 Minutes

Disable

BACK ▲ ▼ SAVE

or Tstat

--- BACNET MODE ---

Disable

Enable

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

STARTUP SETTINGS

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

Program Change Switch Setting

To be able to change the M4-LHS settings the Program/Run Switch must be set to Program.

The switch is located under the Enclosure Wiring Cover for security.

Startup Sequence

Button: MENU/<System Startup>

• When powered, the M4-LHS performs a self diagnostics-test.

• On the rst power up, the System Startup screen will appear after the initialization is complete. If it doesn’t, the M4-LHS has already been congured.

• The System Startup menu sets the main parameters that relate to the heating application.

These settings must be set by the installer.

Boiler Type

Modulation,Hybrid Default:Modulation

Button: MENU/<System Startup>/..../Boiler Type

• The same Laars control can operate modulating boilers or a combination of both types.

• The Modulation option will operate a variety of modulating boiler signals.

• The Hybrid option will sequence two groups of boilers, condensing and non-condensing. Each group could be of a different boiler type (Modulation or Staging). See "Hybrid Logic

Overview" on page 3. Each Multi-Stage boiler will use a single output relay for each stage.

• If BACnet is to be used, each of the Boiler Type modes will have a different set of BACnet

variables. See "Hybrid - Outdoor Reset - BACnet Variable list" on page 44.

Sensor Type

Reset°F,Reset°C,SetPoint°F,SetPoint°C,4-20mAEMS Default:Reset°F

(Set Point Options are Not Available with Hybrid Boiler Type)

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

• If Reset °F is selected, all temperatures and settings will be displayed in degrees Fahrenheit

and the control will use Reset Ratios to adjust the system set point.

• If Reset °C is selected, all temperatures and settings will be displayed in degrees Celsius and

the control will use Reset Ratios to adjust the system set point.

• If Set Point °F is selected, all temperatures and settings will be displayed in degrees

Fahrenheit and the control will have an adjustable system set point.

• If Set Point °F is selected, all temperatures and settings will be displayed in degrees Celsius

and the control will have an adjustable system set point.

• The 4-20mA EMS option is only available to the Hybrid Boiler Type option. To use

4-20mA EMS with Modulating Boiler Type, select one of the Set Point options and the EMS Input Mode menu will follow to offer the 4-20mA EMS option.

• The use of the 4-20mA EMS option requires the purchase of the 4-20mA EMS Interface. It

gives the M4-LHS the capability of accepting a remote 4-20mA signal from a BMS or EMS system as the target set point.

• If BACnet is to be used, each of the Sensor Type modes will have a different set of BACnet

variables. See "Hybrid - Outdoor Reset - BACnet Variable list" on page 44.

EMS Input Mode

Disable,Enable Default:Disable

(Available after Set Point with Modulation Boiler Types)

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

• It allows the M4-LHS to utilize the 4-20mA EMS Interface to accept a remote 4-20mA signal from a BMS or EMS system as the target set point.

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

Season Winter

System Target 140 <System Settings> <Maintenance> <Histories> <System Startup>

BACK ▲ ▼ SELECT

--- BOILER TYPE ---

Modulation

Hybrid

BACK ▲ ▼ SAVE

Modulating Options

-- SENSOR TYPE --

Reset oF

Reset Set Point oF Set Point oC

BACK ▲ ▼ SAVE

--- SENSOR TYPE ---

Reset oF

Reset 4-20mA EMS

BACK ▲ ▼ SAVE

- EMS INPUT MODE -

Disable

Enable

BACK ▲ ▼ SAVE

Hybrid Options

RUNPROGRAM

M4-LHS Installation and Operation Manual

HT# 059295-00 A

EMS 4mA and 20mA Set Points

SWITCH MODE = Target Temperature

4mA: can be set from 50°F/ 10°C to 200°F/93°C Default: 70°F/ 21°C 20mA: can be set from 70°F/ 21°C to 220°F/104°C Default: 220°F/ 104°C

Button: MENU/<System Startup>/..../Sensor Type / EMS Input Mode/EMS 4mA Set Point

• With the use of the 4-20mA EMS Interface, the M4-LHS will be able to receive a 4-20mA signal as a set point from a BMS or an EMS system as the target set point.

• The 4mA and 20mA Set Point menus will follow the selection of the 4-20mA EMS sensor type option or EMS input Mode.

• There must be at least a 20°F differential between the 4mA and 20mA temperature settings.

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

• Any signal below 2.4mA or above 21.6mA will start an EMS shutdown. The display will

indicate that by displaying the message "Shutdown by EMS ".

HYBRID STARTUP SETTINGS

See "Hybrid Logic Overview" on page 3.

System Temp

140°F

NONCOND

CONDCOND

SYSTEM

OD=

F SYS=

145

<<A>> B 100% 52%

SYS

PWR

/ V

CUR / VL

UR / VL

mAGND

VLT

Above the Switch Set Point

DO NOT APPLY ANY VOLTAGE

RUNPROGRAM

TO INPUT TERMINALS

SHUTDOWN

OUTDOOR

SYSTEM

PROVE

/TSTAT

/DHW

TEMP

R / V

/SETBACK

mAGND

Non-Condensing are the Lead Group Condensing are the Lag Group

-EMS 4ma SETPOINT -

[ ]

BACK ▲ ▼ SAVE

-EMS 20ma SETPOINT-

220

[ ]

BACK ▲ ▼ SAVE

120°F

100°F

NONCOND

Target Switch Set Point

SYSTEM

OD=

F SYS=

145

<<A>> B 100% 52%

DO NOT APPLY ANY VOLTAGE

RUNPROGRAM

TO INPUT TERMINALS

OWN

EXTENSIO M

OUTDOOR

SYS

/TS

TEMP

R / VL

UR / V

CUR / VLT

CUR / V

mAG

mAGND

VLT

GND

VLT

GND

RS-4

789

= 120°F

Below the Switch Set Point

Condensing are the Lead Group Non-Condensing are the Lag Group

CONDCOND

Switch Set Point

From 0ºF/ -18ºC to 200ºF/ 94ºC Default: 150ºF/ 66ºC

Button: MENU/<System Startup>/..../Sensor Type/Switch Setpoint

• It is the set point at which the M4-LHS will switch between the Condensing Boiler Group and Non-Condensing Boiler Group.

• The Condensing Boiler group will be the lead group when the Target Temperature is below the Target Switch Set Point. However, the Non-Condensing Group will be the lead group when the Target Temperature is above the Target Switch Set Point.

Switch Differential

Adjustable from 5Fº / 3Cº to 20Fº / 11Cº Default: 10Fº / 6Cº

Button: MENU/<System Startup>/..../Switch Setpoint/Switch Diff

• The Switch Differential controls the group switching. It allows the Calculated Target to

group over.

• The default value is a good start to avoid oscillation between Condensing and NonCondensing Boiler groups, particularly if no Switch Delay was set. See next setting.

- SWITCH SETPOINT -

150

[ ]

BACK ▲ ▼ SAVE

--- SWITCH DIFF ---

F [ ]

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Switch Delay

Adjustablefrom0.0to12.0Hours Default:0.5hours

Button: MENU/<System Startup>/..../Switch Setpoint/Switch Diff/Switch Delay

• The Switch Delay is an additional layer of assurance used to reduce the intermittent change

of the lead group.

• To switch the lead group when the temperature is dropping, the sensor temperature must

remain below the Switch Set Point less the Switch Differential for the complete Switch Delay period before the switching of the lead group.

• I.e., if the Switch Set Point was set to 135ºF, and the Switch Differential was set to 5ºF, then the Target Temperature must drop below 130ºF for the complete Switch Delay for the lead

group to change from Condensing to Non-Condensing.

• To switch the lead group when the temperature is rising, the Target Temperature must rise

above the Switch Set Point for the complete Switch Delay before the switching of the lead group could take effect.

--- SWITCH DELAY ---

0.5Hour

[ ]

BACK ▲ ▼ SAVE

Heavy Load Sequence 2nd Group

Yes,No Default:No

Button: MENU/<System Startup>/..../Switch Delay/Heavy Load Seq#2 Group

• This option makes the second group of boilers act as a backup in heavy load conditions.

Thus, allowing them to start after all lead group boilers have run at their maximum capacity.

• If the system was designed to operate both groups of boilers in heavy load conditions, then

select Yes.

• Selecting No will only allow the lead group to operate. The secondary group will remain off

even if the system cannot reach the desired set point.

Condensing and Non-Condensing Boiler Type

Modulating,Staging Default:Modulating

Button: MENU/<System Startup>/..../Heavy Load Seq#2 Group/Condensing Boiler Type

• Select the appropriate boiler type from the list. Each of the types will be followed by a related additional conguration settings to adjust.

Condensing and Non-Condensing Boiler Number

Adjustablefrom1to15 Default:1

Button: MENU/<System Startup>/..../Condensing Boiler Type/ Condensing Boiler Number

• Select the number of condensing boilers. These boilers will occupy the rst letters of the

wiring stages on the M4-LHS starting with Stage-A.

• Then, select the number of non-condensing boilers later in the Startup menu. See "HYBRID

Startup Menu" on page 17.

• Note that, each Multi-Stage boiler requires the use of single output stage relay.

HEAVY LOAD

-SEQUENCE #2 GROUP-

Yes

BACK ▲ ▼ SAVE

CONDENSING

---- BOILER TYPE ----

Modulating

Staging

BACK ▲ ▼ SAVE

CONDENSING

-- BOILER NUMBER --

[ ]

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

HT# 059295-00 A

HYBRID MODULATING BOILER SETTINGS

Modulating Output Type

4-20mA,0-10V,1-10V(Custom)Outputs Default:1-10vCustom

Button: MENU/<System Startup>/..../Condensing Boiler Number/Output A Type

• If either of the Condensing or Non-Condensing Boiler groups was set to Modulating as the

Boiler Type, the M4-LHS will offer the capability of controlling a variety of modulating

signals. Each boiler can be congured to have a different modulating signal.

• The modulating output for each boiler can be congured to 4-20mA operation (Current) or

any of the voltage options. Check the boiler to determine its signal requirements.

• When using the Extension, connect it to the M4-LHS prior to conguring the Output Type.

Otherwise, the M4-LHS might not recognize the Extension stages.

Modulating Mode

Normal,Parallel Default:Normal

Button: MENU/<System Startup>/..../Output A Type/Condensing Modulating Mode

• Some modulating boilers perform better at higher modulation. For these units, it is

advantageous to run one unit at high modulation than several units at lower modulation. If the units used are of this type, select Normal. This is the recommended setting for boilers with low turndown ratios.

• Most condensing boilers run more efciently at lower modulation. If it is more energy efcient to run several units at lower modulation than one at high. In this case select

Parallel. This is typically used on condensing boilers or boilers with high turndown ratios.

• For best Parallel performance, set the Modulation Start % to be equivalent to the lowest ring rate of the boiler multiplied by 2. That is, if the lowest ring of the boiler was 20%,

set your Modulation Start% to 40%. See "Modulation Start %" on page 40.

• Set the Lag Delay to 0 for better parallel performance. See "Lag Delay" on page 33.

CONDENSING

-- OUTPUT A TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

WARNING

Make sure that boiler modulation

wiring matches the signal selected.

Warranty will not cover failed

components caused by improper

wiring. See "Wiring the Boilers" on

page 14.

CONDENSING

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

NON-CONDENSING

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

HYBRID STAGING BOILER SETTINGS

Staging Output Type

On/Off,2-Stage,3-Stage,4-StageOutputs Default:On/Off

Button: MENU/<System Startup>/..../Non-Condensing Output Type

• The M4-LHS can sequence multi-stage boiler starting with a single On/Off and up to a

4-stages. Just select the number of stages per boiler from this menu option.

• For each boiler stage a single output relay will be used. That is a 2-stage boiler will use two

of the control stages.

• The number selected applies to all sequencing boilers within that group whether it is

Condensing or Non-Condensing.

• The maximum number of stages the control can operate is 4. But with the addition of up to

two extensions, it can handle up to a total of 16 stages.

Staging Mode

Lo/Hi/Lo/Hi,Lo/Lo/Hi/Hi Default:Lo/Hi/Lo/Hi

Button: MENU/<System Startup>/..../Non-Condensing Output Type/Non-Cond Staging Mode

• During low load conditions, some boilers run more efcient when the lower stages are

energized alone than with the higher stages. For these types of boilers select Lo/Lo/Hi/Hi. Then, the M4-LHS will sequence the lower stages of all boilers set to Auto before sequencing the higher stages.

• For the rest of the boiler types, the Lo/Hi/Lo/Hi should allow the staging of the lower stage

of the lead boiler followed by the higher stage of the same boiler. Then when more stages

are needed, it will re the lower stage of the lag boiler followed by the higher stages

NON-CONDENSING

-- OUTPUT TYPE --

On/Off

2-Stage 3-Stage 4-Stage

BACK ▲ ▼ SAVE

NON-CONDENSING

- STAGING MODE -

LO/HI/LO/HI

LO/LO/HI/HI

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

MODULATING BOILER SETTINGS

Boiler Number

Adjustablefrom1to15 Default:1

Button: MENU/<System Startup>/Boiler Type/.../Boiler Number

• Select the number of modulating boilers.

Modulating Output Type

4-20mA,0-10V,1-10V(Custom)Outputs Default:1-10vCustom

Button: MENU/<System Startup>/..../Boiler Number/Output A Type

• The M4-LHS will offer the capability of controlling a variety of modulating signals. Each boiler can be congured to have a different modulating signal. Check the boiler to

determine its signal requirements.

• When using the Extension, connect it to the M4-LHS prior to conguring the Output Type. Otherwise, the M4-LHS might not recognize the Extension stages.

Modulating Mode

Normal,Parallel Default:Normal

Button: MENU/<System Startup>/..../Output A Type/Modulating Mode

• Some modulating boilers perform better at higher modulation. For these units, it is

advantageous to run one unit at high modulation than several units at lower modulation. If the units used are of this type, select Normal. This is the recommended setting for typical steel and cast iron boilers or boilers with low turndown ratios.

• There are many condensing boilers that run more efciently at lower modulation. If it is more energy efcient to run several units at lower modulation than one at high, select

Parallel. This is typically used on condensing boilers or boilers with high turndown ratios.

• For best Parallel performance, set the Modulation Start % to be equivalent to the lowest ring rate of the boiler multiplied by 2. That is, if the lowest ring of the boiler was 20%,

set your Modulation Start% to 40%. See "Modulation Start %" on page 40.

• Set the Lag Delay to 0 for better parallel performance. See "Lag Delay" on page 33.

WARNING

Make sure that boiler modulation

wiring matches the signal selected.

Warranty will not cover failed

components caused by improper

wiring. See "Wiring the Boilers" on

page 14.

-- BOILER NUMBER --

[ ]

BACK ▲ ▼ SAVE

OUTPUT A TYPE --

4-20mA

0-10volt 0-5volt 2-10volt 1-5volt

BACK ▲ ▼ SAVE

- MODULATING MODE -

Normal

Parallel

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

HT# 059295-00 A

STARTUP SETTINGS (CONTINUED)

Prove/Indirect Domestic Hot Water (DHW) Priority

Prove,DHWPriority,DHWNoPriority,NoPriority(Summer) Default:Prove

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

• This setting determines the functionality of input terminals 29 and 30.

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

shorted/closed. However, it will allow the System relay to operate normally.

• There are three DHW Priority options. In all the options, a DHW call will raise the calculated water temperature to the DHW Set Point (See next setting).

• The Domestic Hot Water Priority option de-energizes the System relay during domestic hot water calls for a period of one hour. If after the priority period the DHW call did not expire,

the System relay will energize providing heat to the building and the temperature target will

remain at the DHW Set Point. After the DHW call ends, the set point will drop to satisfy the

reset ratio or set point.

• Domestic Hot Water No Priority option allows the System relay to remain energized during a domestic hot water call (aquastat call on terminals 29 and 30). However, in Summer,

Shutdown, No Tstat call for heat, or when the outdoor temperature is above Outdoor Cutoff,

a DHW call will energize the System relay. After the DHW call terminates, the System relay

will continue to run for the System Run-On period before turning off.

• Domestic Hot Water No Priority (Summer) behaves the same as the DHW No Priority.

The only difference is that in Summer, Shutdown, No Tstat call for heat, or when outdoor

temperature is above Outdoor Cutoff, a DHW call WILL NOT energize the System relay except for the Run-On delay after the DHW call ends.

Indirect Domestic Hot Water Set Point

(Available with any of the DHW Priority options)

Adjustablefrom140°F/60°Cto200°F/93°C Default:180°F/82°C

Button: MENU/<System Startup>/..../Prove-Setpoint

• On a DHW call, the M4-LHS will raise the target temperature to the DHW Set Point until the DHW call expires.

PROVE/DHW SHARING

Prove

DHW Priority DHW No Priority No Priority (Summer)

BACK ▲ ▼ SAVE

- DHW SETPOINT -

[ ]

BACK ▲ ▼ SAVE

180

Shutdown/Tstat/Setback Mode

ShutdownInput,TstateInput,SetbackInput Default:ShutdownInput

Button: MENU/<System Startup>/..../Setback\Shutdown

• This menu determines the functionality of terminals 31 and 32.

• The M4-LHS has two levels of heat, a Normal/Day and a Setback/Night. The Normal/Day

is good for when buildings are occupied and people are active. The Setback/Night holds a lower system temperature for night periods or when buildings are unoccupied.

• When Shutdown or Tstat is selected, the Day/Night Schedules will be available in the operating menu. See next settings. Terminals 31 and 32 will function as a Shutdown (Turn off boilers when shorted) or as a Tstat (Turn off boilers when opened). However, a call for indirect DHW will bring the boilers on.

• When Setback is selected, the External Signal option will switch the M4-LHS to Setback

mode when terminals 31 and 32 are shorted. This allows an external device or control to provide the setback signal. No scheduling or boost menu options will be available with Setback.

- SETBCK/SHUTDOWN -

Shutdown/Disable

Tstat/Enable Setback

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Boost Mode

(Not Available in Setback Mode)

30Minutes,Disabled Default:Disable

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

• The morning Boost is designed to return the building to comfortable ambient temperatures after the cooler Night (Setback) period. The control 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 specic 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.

• If no Boost is needed, then simply select Disabled from the Boost Menu.

• Boost is only available if Shutdown or Tstat is selected as an option. See previous setting.

--- BOOST MODE ---

30 Minutes

Disable BACK ▲ ▼ SAVE

Sensor Fault

AllOff,AllOn Default:AllOn

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

• The Sensor Fault will determine the operating status of all output stages that has their Mode

set to Auto when a sensor reads Short or Open.

• When All-Off is selected, the control will turn all boilers Off when the System sensor reads

Short or Open. However, when the Outdoor sensor reads Short or Open, the control will try

to maintain the Minimum Water Temperature.

• When All-On is selected and the Boiler Type was set to other than Hybrid, the control will

turn all boilers On to a 100% when the System sensor reads Short or Open and the outdoor temperature is below Outdoor Cutoff. However, when the Outdoor sensor reads Short or

Open, the control will try to maintain the Maximum Water Temperature.

• When All-On is selected and the Boiler Type was set to Hybrid, the control will turn all Non-Condensing boilers On to full re when the System sensor reads Short or Open and the

outdoor temperature is below Outdoor Cutoff. During that time all Condensing boilers will

turn Off. When the Outdoor sensor reads Short or Open, the control will try to maintain the Maximum Water Temperature.

and adjustments to match the new

SETTING THE CONTROL TO FACTORY DEFAULTS

To Reset the M4-LHS control to its original factory defaults, power down the control. Hold down the two right most buttons while powering the control back up until the TOTAL CLEAR STARTED screen appears. The Display will direct you to the Startup menu to program the control after the defaults are loaded.

--- SENSOR FAULT ---

All Off

All On BACK ▲ ▼ SAVE

ALERT

A good practice after performing

any Startup menu modification

is to check all operating settings

settings.

TOTAL CLEAR STARTED

Release buttons

and

Please Wait

NOTE: When resetting the control to original factory defaults all control settings will be

overwritten and will no longer exist.

ALERT

Do not turn off power to control until all Startup settings have been made. Otherwise, the next

power-up will be set to many Startup factory settings that may not fit your application.

M4-LHS Installation and Operation Manual

HT# 059295-00 A

BACNET MSTP COMMUNICATION MENU

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

Season Winter

System Target 140 <System Settings> <Maintenance> <System Startup>

BACK ▲ ▼ SELECT

---- BACNET ID ----

477000

[ ]

BACK ▲ ▼ SAVE

When using the M4-LHS in a BACnet MS/TP network, the use of BACnet Interface Module is required. In addition, each of the Boiler Type and Sensor Type Startup menu option will offer a different list of BACnet variables. See "Boiler Type" on page 19. See "Sensor Type" on page

19. Also, see "Hybrid - Outdoor Reset - BACnet Variable list" on page 44

-- ARE YOU SURE? --

Yes

BACK ▲ ▼ SAVE

----MS/TP ADDRESS----

[ ]

BACK ▲ ▼ SAVE

BACnet Mode

Enable,Disable Default:Disable

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

• This menu option enables or disables the BACnet MSTP capability. When enabled,

additional BACnet settings shall be available for further customizing.

• Note that if this option was enabled while no BACnet communication is present, the BAcnet error message will supersede other messages. See "Display Messages" on page 38.

--- BACNET MODE ---

Disable

Enable

BACK ▲ ▼ SAVE

- BACNET BAUDRATE -

9600

19200

38400

BACK ▲ ▼ SAVE

--- BACNET MODE ---

Disable

Enable

BACK ▲ ▼ SAVE

BACnet Baud Rate

9600,19200,38400 Default:19200

Button: MENU/<System Startup>/.... Sensor Fault/BACnet Mode/BACnet Baudrate

• For the control to communicate over a BAcnet MS/TP network, it must use the same Baud

rate as the rest of the network. The control offers three Baud Rates.

• If communication was not successful, the baud rate could be the cause. Check with the

network administrator for the network baud rate. Then match it on the control.

MS/TP Address

1to127 Default:64

Button: MENU/<System Startup>/.... /BACnet Mode/BACnet Baudrate/ MSTP Address

• Each device on the MS/TP network must have a unique address.

• This is the MS/TP address on a RS485 network. Its MS/TP range is 1 though 127.

• The MS/TP address must be provided by the Network Administrator.

BACnet ID

1to4,000,000 Default:477,000

Button: MENU/<System Startup>/.... / MSTP Address / BACnet ID

• The BACnet ID is a unique 32 bit number that identies the control within the BACnet

network. No two ID shall be the same even if dealing across networks.

• It must be provided by the BACnet Network Administrator.

- BACNET BAUDRATE -

9600

19200

38400

BACK ▲ ▼ SAVE

----MS/TP ADDRESS----

[ ]

BACK ▲ ▼ SAVE

---- BACNET ID ----

477000

[ ]

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

OPERATING SETTINGS

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

Outdoor Temperature

Water Temperature

70 405060

130

120

110

100

Outdoor Temperature

Water Tem perature

70 405060

110

100

Outdoor Temperature

Water Tem perature

70 405060

150

140

130

120

1:4

With a 0° Offset, the Reset curves begin at 100° Water Temperature.

With a -20° Offset, the Reset curves begin at 80° Water Temperature.

With a +20° Offset, the Reset curves begin at 120° Water Temperature.

1:4

1:4 1:1

1:1

4:1

100

+20 Offset

-20 Offset

Program Change Switch Setting

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

The switch is located under the Enclosure Wiring Cover for security.

Season

Winter,Summer Default:Winter

Button: MENU/Season

• The M4-LHS will turn all boiler relays off when it is in Summer setting. However, an indirect DHW call will bring boilers back on when needed. The Message Display Line will

display Summer to show the status.

• In Winter, the M4-LHS will activate the System relay whenever the Outdoor Temperature (OD) falls below the Outdoor Cutoff setting. The Message Display Line will not show any season information when in Winter.

• When the heating season is over, it is a good practice to switch the M4-LHS to Summer setting. This will allow the control to sequence the boilers on an indirect DHW call.

Set Point

Adjustable70ºF-250ºF Default:70ºF

(Not Available for Hybrid Boiler Types)

Button: MENU/Set Point

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

• The M4-LHS 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 uctuate around the set point. The amount of uctuation

depends on the modulation settings and stage Settings.

• If the EMS Input Mode was Enabled, the Set Point will be set by the EMS system and will

be available to be read but not changed on the display. See "EMS Input Mode" on page 19.

Reset Ratio

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

Button: MENU/System Target

• The Reset Ratio determines how the System water temperature (SYS) will vary with Outdoor Temperature (OD). With any of the ratios, the colder it becomes outside, the hotter the temperature of the system water. See "Outdoor Reset 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 oor heating applications.

• 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 low 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).

M4-LHS Installation and Operation Manual

RUNPROGRAM

----- SEASON -----

Winter

Summer

BACK ▲ ▼ SAVE

ALERT

DO NOT turn power off to the

M4-LHS 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 -----

[ ]

BACK ▲ ▼ SAVE

-- SYSTEM TARGET --

1.00oOD = 4.00oSys

1.00oOD = 3.00oSys

1.00oOD = 2.00oSys

1.00oOD = 1.50oSys

1.00oOD = 1.25oSys

1.25

OD = 1.00oSys

1.00

1.50oOD = 1.00oSys

2.00oOD = 1.00oSys

3.00oOD = 1.00oSys

4.00oOD = 1.00oSys

BACK ▲ ▼ SAVE

130

120

110

Water Temperature

100

70 405060

Reset Ratio

1:4 1:1

Warmer

Colder

Outdoor Temperature

4:1

HT# 059295-00 A

HYBRID OPERATING MENU

OD= 55oF SYS=143

<<A>> B 67% 22%

STAGE ◄ ► MENU

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

[ ]

BACK ▲ ▼ SAVE

--- PURGE DELAY ---

1.0 min

[ ]

BACK ▲ ▼ SAVE

-- SYSTEM RUN-ON --

10 min

[ ]

BACK ▲ ▼ SAVE

-- LEAD ROTATION --

Manual

Time

Last-On

BACK ▲ ▼ SAVE

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

Season Winter

System Target 140 <System Settings>

----- SEASON -----

Winter

Summer

BACK ▲ ▼ SAVE

BACK ▲ ▼ SELECT

-- SYSTEM TARGET --

1.00oOD = 4.00oSys

1.00oOD = 3.00oSys

1.00oOD = 2.00oSys

1.00oOD = 1.50oSys

----- SETTINGS 1 ----

Setback 10oF

Purge Delay 1.0min System Run-On 10min Lead Rotation Time <More Settings>

BACK ▲ ▼ SELECT

1.00oOD = 1.25oSys

1.25

OD = 1.00oSys

1.00

1.50oOD = 1.00oSys

2.00oOD = 1.00oSys

3.00oOD = 1.00oSys

4.00oOD = 1.00oSys

BACK ▲ ▼ SAVE

ALERT

To be able to change the M4-LHS

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 secured using a lock.

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

[ ]

BACK ▲ ▼ SAVE

- OUTDOOR CUTOFF -

[ ]

BACK ▲ ▼ SAVE

MINIMUM WATER TEMP

[ ]

BACK ▲ ▼ SAVE

-- STANDBY TIME --

10 min

[ ]

BACK ▲ ▼ SAVE

LAST STAGE HOLD

[ ]

BACK ▲ ▼ SAVE

--- LEAD STAGES ---

Cond Lead A

Non-Cond Lead C

BACK ▲ ▼ SAVE

HT# 059295-00 A

----- SETTINGS 2 ----

Standby Time 10min

Last Stg Hold 5

F <Lead Stages> <Staging Settings> <Mdlating Settings> <Day/Night Schdule>

BACK ▲ ▼ SELECT

DAY/NIGHT SCHEDULE

Set Time **:**

Day Schedule 6:00a Night Schedule 8:00p

BACK ▲ ▼ SAVE

MAXIMUM WATER TEMP

200

[ ]

BACK ▲ ▼ SAVE

- STAGE SETTINGS -

Reaction Time 2min

Minimum Runtime 2min

BACK ▲ ▼ SAVE

MODULATION SETTINGS

Gain +0

Lag Delay 0min Soft-Off Delay 45sec

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

MODULATING OPERATING MENU

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

OD= 55oF SYS=143

<A> B 67% 22%

STAGE ◄ ► MENU

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

[ ]

BACK ▲ ▼ SAVE

Season Winter

System Target 140 <System Settings> <Maintenance> <System Startup>

BACK ▲ ▼ SELECT

----- SETTINGS 1 ----

Setback 10oF

Purge Delay 1.0min System Run-On 10min Lead Rotation Time <More Settings>

BACK ▲ ▼ SELECT

----- SEASON -----

Winter

Summer

BACK ▲ ▼ SAVE

Set Point

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

F [ ]

BACK ▲ ▼ SAVE

- OUTDOOR CUTOFF -

[ ]

BACK ▲ ▼ SAVE

--- PURGE DELAY ---

1.0 min

[ ]

BACK ▲ ▼ SAVE

-- SYSTEM RUN-ON --

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

10 min

[ ]

BACK ▲ ▼ SAVE

-- LEAD ROTATION --

Manual

Time

Last-On

BACK ▲ ▼ SAVE

Last Stg Hold 5 <Lead Stages> <Mdlating Settings> <Day/Night Schdule>

-- STANDBY TIME --

BACK ▲ ▼ SELECT

10 min

[ ]

BACK ▲ ▼ SAVE

Day Schedule 6:00a Night Schedule 8:00p

LAST STAGE HOLD

F [ ]

BACK ▲ ▼ SAVE

--- LEAD STAGES ---

Cond Lead A

Non-Cond Lead C

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

BACK ▲ ▼ SAVE

Lag Delay 0min Soft-Off Delay 45sec

BACK ▲ ▼ SAVE

ALERT

To be able to change the M4-LHS

can be secured using a lock.

----- SETTINGS 2 ----

Standby Time 10min

DAY/NIGHT SCHEDULE

Set Time **:**

MODULATION SETTINGS

Gain +0

Reset

- SYSTEM TARGET --

1.00oOD = 4.00oSys

1.00oOD = 3.00oSys

1.00oOD = 2.00oSys

1.00oOD = 1.50oSys

1.00oOD = 1.25oSys

1.25

OD = 1.00oSys

1.00

1.50oOD = 1.00oSys

2.00oOD = 1.00oSys

3.00oOD = 1.00oSys

4.00oOD = 1.00oSys

BACK ▲ ▼ SAVE

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

F [ ]

BACK ▲ ▼ SAVE

- OUTDOOR CUTOFF -

F [ ]

BACK ▲ ▼ SAVE

MINIMUM WATER TEMP

F [ ]

BACK ▲ ▼ SAVE

MAXIMUM WATER TEMP

200

[ ]

BACK ▲ ▼ SAVE

HT# 059295-00 A

Offset

Adjustablefrom50Fº/28Cºto-50Fº/-28Cº Default:0Fº/0Cº

Button: MENU/System Target/Offset

• The Offset adjust the starting points of the Reset Ratio curve. This 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 subtracted from the calculated temperature. For example, if the Set Point was 130°F and the Offset was changed from 0F°

to 10F° (an increase of 10F°), then the Set Point temperature would increase to 140°F.

• The Offset setting does not change the ratio selection. What the Offset does is add or subtract a constant temperature value. See "Outdoor Reset Concept" on page 5.

• If required: AdjusttheWaterOffsetinmildweather. If the ambient building

temperatures are too warm in mild weather, decrease the offset. If the ambient building

temperatures are too cold in 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 temperature. In radiant heat applications, change the offset 1F° or 2F° for every 1F° you wish to change the building temperature.

Outdoor Cutoff Temperature

Adjustable:Off,from20ºF/70ºC-100ºF/38ºC,On Default:65ºF/18ºC

Button: MENU/System Target/Offset/Outdoor Cutoff

• The control will turn heating off if the outside temperature rises above the Outdoor Cutoff. This setting shall not affect any indirect DHW requirement.

• The Outdoor Cutoff screen will automatically appear after setting the Offset.

• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the

M4-LHS will operate the boilers to hold the calculated temperature.

• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the

M4-LHS will turn all boilers off. The System relay will remain energized for the Run-On delay then de-energize.

• The Outdoor Cutoff can be set from 20°F to 100°F. In addition, it 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-LHS will circulate is 70°F. If the Outdoor Cutoff is turned

ON and the Season is set to Winter, the M4-LHS 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 ------

[ ]

BACK ▲ ▼ SAVE

Offset=10°F

Reset Ratio=1.5 : 1.0

180

170

160

150

140

130

120

Water Temperature (in °F)

110

100

Reset Ratio + 10F Offset

Min Target

70 60 50 40 2030 0 -1010 -20

Outdoor Temperature (in °F)

Max Target

Reset Ratio

Min Target=120°F

Max Target=170°F

Target Offset

- OUTDOOR CUTOFF -

[ ]

BACK ▲ ▼ SAVE

Minimum Water Temp

Adjustablefrom50ºF/10ºCto180ºF/82ºC HybridDefault:70ºF/21ºC   ModulationDefault:120ºF/49ºC

Button: MENU/System Target/Offset/Outdoor Cutoff/Minimum Water Temp

• The Minimum Water Temperature must be set to the boiler manufacturer’s specication.

The M4-LHS will calculate the Set Point based on the Outdoor Temperature (OD), the Reset Ratio, and the Offset value. The M4-LHS will control all boilers 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).

Maximum Water Temp

Adjustable70ºF/21ºC-220ºF/104ºC Default:200ºF/93ºC

Button: MENU/System Target/Offset/..../Maximum Water Temperature

• This is the highest temperature heating water the M4-LHS will circulate through the heating system.

• When using a radiation system, it should be set according to the tubing or oor manufacturer’s specication.

• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature (See previous setting).

HT# 059295-00 A

M4-LHS Installation and Operation Manual

MINIMUM WATER TEMP

[ ]

BACK ▲ ▼ SAVE

MAXIMUM WATER TEMP

200

[ ]

BACK ▲ ▼ SAVE

SYSTEM SETTINGS

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

Button: MENU/<System Settings>

Settings 1 and Settings 2 menus provide access to adjusting and ne-tuning the system for

enhanced comfort and better fuel savings. The M4-LHS behaves differently based on the selected modes. See "Startup Settings" on page 19.

ALERT

To be able to change the M4-LHS 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 secured using a lock.

Setback

Adjustablefrom0F°/0C°to75F°/42C° Default:10F°/6C°

Button: MENU/<System Settings>/Setback

• The Setback feature can be used to provide the M4-LHS 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 example, if the calculated temperature is 180°F and the Setback is 20°F, then when in

Setback or Night Schedule, the M4-LHS will hold a Set Point of 160°F = 180°F- 20°F. See "Day - Night Schedule" on page 36.

• A typical use for the Setback is to provide less system temperature to a building during

the Night Schedule or on the weekends when people are asleep or when the building is not occupied, but heat is still needed.

• The amount of Setback selected is subtracted from the Set Point when a Setback Input

Signal is received or the Night Time schedule setting started.

• If Setback is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/Setback Mode" on page 24.), the Setback will not be activated unless a Short dry-contact signal is received on terminals (31 and 32).

• If Shutdown or Tstat is selected as the Shutdown/Tstat/Setback Mode (See "Shutdown/Tstat/ Setback Mode" on page 24.), the Setback will be activated only during the Night Schedule.

----- SETTINGS 1 ----

Setback 0oF

Purge Delay 1.0min System Run-On 0min Lead Rotation Time <More Settings>

BACK ▲ ▼ SELECT

----- SETTINGS 2 ----

Standby Time 10min

Last Stg Hold 0 <Lead Stages> <Staging Settings> <Mdlating Settings> <Day/Night Schdule>

BACK ▲ ▼ SELECT

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

[ ]

BACK ▲ ▼ SAVE

RUNPROGRAM

ALERT

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.

Purge Delay

Adjustablefrom0.0minto10.0min Default:1.0min

Button: MENU/<System Settings>/Purge Delay

• Many boilers go through a purge cycle before they are brought on line. When the M4-LHS

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

• The Purge Delay helps prevent short cycling of any 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. 1.5 minute will equal 90 seconds.)

• The Message Display Line will display Purge Delay and the remaining time.

System Run-On

Adjustablefrom0minto360min Default:10min

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

• A common use for the System Run-On is to control a system pump in a heating system.

The extra time helps transfer the boiler residual heat to the heating system.

• The System relay will energize whenever the outdoor temperature is below the Outdoor Cutoff and the Shutdown is Open or the Tstat is closed. When the Outdoor Temperature

rises 2°F above the Outdoor Cutoff or the control is switched to Summer and after the last burner relay has de-energized, the System relay will remain energized for the System RunOn period.

M4-LHS Installation and Operation Manual

--- PURGE DELAY ---

1.0 min

[ ]

BACK ▲ ▼ SAVE

ALERT

Set Purge Delay as per boiler

manufacturer recommendation.

-- SYSTEM RUN-ON --

10 min

[ ]

BACK ▲ ▼ SAVE

HT# 059295-00 A

• The System Run-On time should be set based on the size and type of the boilers and

pumps used. In general, when setting the System Run-On consult the boiler and pump manufacturers for the best setting.

• When the System relay is in the Run-On period, the Message Display Line will indicate that

status and the remaining time.

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 rst boiler brought on when an output is needed.

• The Lead Boiler can be rotated automatically every specied time period, manually, or

based on Last-On. Time rotation is recommended.

• The Lead Group Lead Boiler is shown in bracket layers on the main display. The Lag Group lead Boiler is shown in a single bracket. See "Boiler Status" on page 38.

• 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.

Standby Time

Adjustablefrom1minto60min Default:10min

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

• Standby boilers are used for backup or extreme load conditions only. A Standby boiler can

never be a Lead Boiler.

• The Standby Time only applies to boilers set to Standby.

• A boiler can be set to be a Standby boiler using the Stage Menu. See "Mode" on page 39.

• A Standby boiler can only be activated after all the boilers in Auto Mode have run at 100%

modulation for the full Standby Time.

• The full Standby Time must always elapse regardless of what happens to the system

temperature. Therefore, shorter Standby Times will result in smoother set point operation in extreme conditions. On the other hand, longer Standby Times may prevent a Standby boiler

from ring if the other boilers can eventually meet the load, or if the load decreases.

-- LEAD ROTATION --

Manual

Time

Last-On

BACK ▲ ▼ SAVE

-- LEAD ROTATION --

24hrs

[ ]

BACK ▲ ▼ SAVE

-- STANDBY TIME --

10 min

[ ]

BACK ▲ ▼ SAVE

Last Stage Hold

Adjustablefrom0F°/0C°to30F°/17C° Default:5F°/3C°

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

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

• In these conditions, the system might require less output than the lowest lead Stage. When

the M4-LHS brings on the Lead Stage, the Set Point is quickly exceeded, and the M4-LHS turns the Lead Stage off.

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

the system temperature exceed the Set Point by the number of degrees selected.

• For example, with a Set Point of 160°F and a Last Stage Hold setting of 10°F, the Lead Stage boiler will de-energize after the Set Point exceeds 170°F (160°F + 10°F).

• In many cases, it is better to overshoot slightly than to short cycle a boiler.

• When Soft-Off is set to other than 0 seconds, the Lead Boiler will need to remain at or

exceed the Last Stage Hold for the Soft-Off period before turning off.

Lead Stages

CondensingLead,Non-CondensingLead Default:1stboilerintheGroup

Button: MENU/<System Settings>/<More Settings>/Lead Stages

• In addition to having a lead group, each group of boilers, Condensing Group and

Non-Condensing Group, will have its own lead boiler that can be selected from this menu.

• After assigning the lead boiler for each group, the lead will rotate based on the Lead

Rotation option selected. See "Lead Boiler Rotation" on page 32.

• The Lead Group Lead Boiler can be identied by the two brackets <<A>>.

• The Lag Group Lead Boiler can be identied by the one bracket <C>.

LAST STAGE HOLD

[ ]

BACK ▲ ▼ SAVE

--- LEAD STAGES ---

Cond Lead A

Non-Cond Lead C

BACK ▲ ▼ SAVE

HT# 059295-00 A

M4-LHS Installation and Operation Manual

MODULATING BOILER OPERATING SETTINGS

Gain

Adjustablefrom-10to+10 Default:0

Button: MENU/<System Settings>/<More Settings>/<Modulating Settings>/Gain

• The Gain adjusts the aggressiveness of the modulating PID logic. It controls 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 oscillate signicantly, 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.

Lag Delay

Adjustablefrom0minto60min Default:0min

Button: MENU/<System Settings>/<More Settings>/<Modulating Settings>/Lag Delay

• The Lag Delay requires the lead stage to remain at 100% modulation for the full period of

the Lag Delay before the lag stage can be activated. For example, if the Lag Delay was set to 10 minutes, the Lead Stage must remain at 100% modulation for the full ten minutes before the lag stage could be activated. The Message Display Line will display Lag Delay and the remaining time.

• 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 Modulation Start % selected for each stage. Regardless of

that setting, the previous stage must reach and stay at 100% before the lag stage can be activated.

• The full Lag Delay must elapse regardless of what happens to the system temperature.

Therefore, set the Lag Delay to 0 minutes to achieve smooth operation.

• Note that if Parallel was selected as the Modulation Mode (See "Modulating Logic Overview" on page 4), this value must be set to 0 minutes to avoid having the lead boiler going to 100% modulation prior to ring the lag boiler.

MODULATION SETTINGS

Gain +0

Lag Delay 0min Soft-Off Delay 45sec

BACK ▲ ▼ SAVE

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

[ ]

BACK ▲ ▼ SAVE

---- LAG DELAY ----

0 min

[ ]

BACK ▲ ▼ SAVE

Soft-Off Delay

Adjustablefrom0secto60sec Default:10sec

Button: MENU/<System Settings>/<More Settings>/<Modulating Settings>/Soft-Off Delay

• When a boiler is no longer needed, the Soft-Off keeps that boiler 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 delay period the M4-LHS needed that stage to turn back on, the stage

will be released from the Soft-Off delay and resume normal operation.

• On a Shutdown initiation or Tstat termination any stage that was On will go into Soft-Off

delay before fully turning off.

ALERT

When using Soft-Off and Last Stage Hold, the last boiler will not turn off until both

parameters have elapsed. In this case, Soft-Off will start after the Last Stage Hold.

M4-LHS Installation and Operation Manual

-- SOFT-OFF DELAY --

10 sec

[ ]

BACK ▲ ▼ SAVE

HT# 059295-00 A

STAGING BOILER OPERATING SETTINGS

Reaction Time

Adjustablefrom1to10minutes Default:2minutes

Button: MENU/<System Settings>/<More Settings>/<Stage Settings>/Reaction Time

• It is the amount of time it takes a single stage to affect the system.

• After the control turns on a stage trying to meet the set point, it will not turn on another

stage until the Reaction Time has elapsed.

• To determine the optimum time, start with a hot system. Then, turn on a single stage and

calculate how long it takes until the system temperature begins to respond to that stage. That period should be set as the Reaction Time.

Minimum Runtime

Adjustablefrom1to60minutes Default:2minutes

Button: MENU/<System Settings>/<More Settings>/<Stage Settings>/Min Runtime

• This is the minimum amount of time any stage will run.

• For the lowest stage of a unit, the Minimum Runtime starts after the purge cycle.

• The Runtime does not apply to the last stage online. The Last Stage Hold applies in that

case.

• Initially, set the Minimum Runtime to half the Reaction Time.

• If the system tends to overshoot, reduce the Minimum Runtime. However, if boilers tend to

short cycle, increase the Minimum Runtime.

Avoiding Conicting Boiler Limits

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

• The M4-LHS 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-LHS 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 higher than 180°F to prevent erratic

operation.

- STAGE SETTINGS -

Reaction Time 2min

Minimum Runtime 2min

BACK ▲ ▼ SAVE

-- REACTION TIME --

2 min

[ ]

BACK ▲ ▼ SAVE

- MINIMUM RUNTIME -

2 min

[ ]

BACK ▲ ▼ SAVE

WARNING

The temperature limits set on the

boilers must be higher than the M4-LHS Max Water Temp. Read the left section for details that will prevent erratic system operation.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Avoiding Conicting Boiler Limits

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

• The M4-LHS 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-LHS 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 higher than 180°F to prevent erratic

operation.

WARNING

The temperature limits set on the

boilers must be higher than the M4-LHS Max Water Temp. Read the left section for details that will prevent erratic system operation.

M4-LHS Installation and Operation Manual

HT# 059295-00 A

DAY - NIGHT SCHEDULE

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

(Available when "Shutdown or Tstat" is selected from the Shutdown/Tstat/ Setback Startup menu option only)

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

• The M4-LHS has two levels of heat. The Day (Normal) 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. See

"Setback" on page 31. 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 the Boost ending point. See "Boost Mode" on page 25. 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-LHS will then raise the calculated water temperature by the Setback amount. Using the previous example, at 5:30AM the M4-LHS will raise the calculated water to 170˚F = (150˚F + 20˚F) until 6:00AM.

DAY/NIGHT SCHEDULE

Set Time **:**

Day Schedule 6:00a Night Schedule 8:00p

BACK ▲ ▼ SAVE

-- DAY SCHEDULE --

6:00 Am

BACK ▲ ▼ SAVE

Set Time

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

• Adjust the time by selecting Set Time from the menu and then scrolling through the hours

then select Save. If the hours are to be set to PM, scroll through the AM hours to reach the PM hours. Then, scroll through the minutes then select Save.

ALERT

Remember that the battery is the backup for the Time. If no power is supplied to the M4-LHS and

there was no battery or the battery had no power, time values will be lost and will need to be reset.

MAINTENANCE

Button: MENU/<Maintenance>

The Maintenance menu gives access to sensor and modulating output trimming. In addition,

you'll have access to view the Startup conguration settings.

ALERT

To be able to change the M4-LHS 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 secured using a lock.

System & Outdoor Sensor Trim

Adjustablefrom-5F°/-3C°to+5F°/+3C° 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 is used

to adjust the displayed value.

• 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.

----- SET TIME -----

7:35 Pm

BACK ▲ ▼ SAVE

----- MAINTENANCE ----

System Trim +0oF

Outdoor Trim 0 <Output Trim> <Configuration>

BACK ▲ ▼ SAVE

SYSTEM SENSOR TRIM

[ ]

BACK ▲ ▼ SAVE

OUTDOOR SENSOR TRIM

[ ]

BACK ▲ ▼ SAVE

RUNPROGRAM

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Output Modulation Trim

(Available for modulating boilers only)

Adjustablefrom-1.0to+1.0 Default:0.0

Button: MENU/<Maintenance>/Output Trim

• Each of the modulating stages controlled 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.

ALERT

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.

-- STAGE A TRIM ---

Output Trim +0.0

BACK ▲ ▼ SAVE

Conguration

Button: MENU/<Maintenance>/<Conguration>

• This menu option provides a consolidated view of the M4-LHS's Startup and Stage settings.

Outdoor and System Temperature

OD= 55oF SYS=143

Prepurge Delay 15 <<A>> B 67% 20%

STAGE ◄ ► MENU

Messages

Boilers and Their Status

}

Button Functions

Buttons

v1.00, ResetoF Outdoor, Non-HeavyLoad Switch:35F,5F,0.5Hr c:mod, 2,Normal nc:mod, 2,Normal Shutdown/Disable

BACK NEXT

PROVE Bst:30, All On 4-20, 4-20, BAC=Enable, 19200,2

BACK EXIT

DISPLAY

The M4-LHS display layout provides a variety of information that gives an immediate picture of the operation status. The display

shows two boilers at a time. When extensions are present, the two middle buttons (◄ ►) scroll the screen to view additional boilers.

Moreover, all the information displayed can be viewed in brightly or dimly lit rooms.

• The buttons' functionality changes based on the screen and menu level. The buttons' functionality is displayed on a dark

background on the screen bottom line.

• (◄ ►) Horizontal arrows are to scroll through the available stages.

• (▲ ▼) Vertical arrows are to scroll through the menu functions when in menus or to change settings when in a setting screen.

• The Top line displays the Outdoor and System sensor values.

• The second line displays all messages pertaining to the operation or status. See "Display Messages" on the next page.

• The third line will list the boiler stages. Additional stages can be scrolled to using the two middle buttons. The lead boiler letter

will be bracketed. See "Lead Boiler Rotation" on page 32. The lead boiler in the lead group will have two sets of brackets.

• The fourth line lists each boiler modulation or sequencing status. See "Boiler Status" on the next page.

M4-LHS Installation and Operation Manual

HT# 059295-00 A

BOILER STATUS

The M4-LHS boiler status gives immediate access to each boiler stages or modulation.

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

• <<A>> A is the lead boiler in the lead Hybrid group. See "Lead Stages" on page 32.

• <C> C is the lead boiler in the lag Hybrid group or the lead boiler in Modulating Boiler Type. See "Lead Stages" on page 32.

• C/E Extension panel is NOT communicating back to the M4-LHS. See "Connecting to the Extensions and 4-20mA EMS Interface" on page 15.

• mON All boiler stages are set to ON.

• mOFF All boiler stages are set to OFF.

Display Modulating Boiler Status

• 97% Boiler is modulating at the indicated percentage.

• m95% Boiler Stage Mode is set to Manual Modulation to the specied percent. See "Mode" on page 39.

• h50% Boiler is in post purge for 30 seconds.

DISPLAY MESSAGES

The M4-LHS display layout reserved the second line for message indications. The following is a list of the most common Message

Display Line information:

• Boost To 170˚F The Boost has started 30 minutes before the Day Schedule setting and the Boost temperature is 170˚F.

See "Boost Mode" on page 25.

• DHW Call (180˚F) There is an indirect DHW call. The M4-LHS will raise the system Set Point to the indicated temperature.

DHW increases calculated temperature to the DHW Set Point. See "Indirect Domestic Hot Water Set

Point" on page 24.

• 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. See "Last Stage Hold" on page 32.

• Interface Module Error There is no communication to the BACnet Module Interface while the BACnet Mode is set to Enable.

See "BACnet Mode" on page 26.

• Lag Delay: 123 The lead boiler is at 100% and the remaining purge time to start the lag boiler in seconds is 123. See "Lag

Delay" on page 33.

• Outdoor Cutoff The outdoor temperature is above the Outdoor Cutoff setting. No boilers will be active for heating. See

"Outdoor Cutoff Temperature" on page 30.

• Prove Failure After boilers have run for some time, Prove signal has ended. All boilers set to Auto or Standby will

de-energize. However, the System relay will remain energized. See "Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24 and "Wiring the Prove" on page 13.

• Purge Delay: 23 A boiler is in purge cycle and the remaining purge time in seconds is 23. See "Purge Delay" on page 31.

• Setback to: 130˚F The Night Schedule or Setback input is active. Current Setback temperature is 130˚F. See "Setback"

on page 31. See "Day - Night Schedule" on page 36.

• Shutdown Active The Shutdown Terminals are Shorted. No boilers will be active. See "Shutdown/Tstat/Setback Mode" on

page 24. Also See "Wiring the Shutdown, Tstat, or Setback" on page 12.

• Summer The control is set to Summer. No heat is active. See "Season" on page 27.

• Switch in: 00:30 The switch from one group to the other will take place after 30 minutes. See "Switch Delay" on page 21.

• 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. See "System Run-On" on page 31.

• Tstat Call The Tstat Terminals are Shorted. Boilers will be active. See "Shutdown/Tstat/Setback Mode" on page 24.

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

"Prove/Indirect Domestic Hot Water (DHW) Priority" on page 24.

BOILER STAGE MENU

HT# 059295-00 A

M4-LHS Installation and Operation Manual

Staging Modulation

SYSTEM

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

HYBRID CONTROL

STAGE A SETTINGS

Mode Auto

BACK ▲ ▼ SELECT

STAGE A MODE

Auto

Standby Manual Off On

BACK ▲ ▼ SAVE

OD= 55oF SYS=143

<<A>> B 67% 20%

STAGE ◄ ► MENU

STAGE A SETTINGS

Mode Auto

Ignition % 1% Mod Start % 80% <Prev Stage> <Next Stage> Copy Settings

BACK ▲ ▼ SELECT

STAGE A

- IGNITION POINT -

[ ]

BACK ▲ ▼ SAVE

STAGE A

MODULATION START

75%

[ ]

BACK ▲ ▼ SAVE

Button: STAGE/

The Stage menu provides adjustment for each of the individually boiler operations.

• In most installations, all active boiler adjustments are the same, but each can be congured

differently if desired.

• If the boilers are not set up properly, the M4-LHS 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 modulating boilers. Everything but the Mode -- Auto/Standby/ Manual/Off/On -- will be copied.

• Then select the <Next Stage> option from the menu to reach the Boiler B settings

menu. Continue until all boilers have been set.

• If an Extension is connected to the M4-LHS and the stages have been set through the

Startup menu, then scrolling through stages using the <Next Stage> and <Prev Stage> menu options will scroll through the Extension stages as well.

ALERT

To change the M4-LHS 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 secured using a lock.

Mode

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

Button: STAGE/Mode

• The M4-LHS 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 outputs connected to active boilers.

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

• The following list describes the MODE options:

Modulating Boiler Stage Menu

STAGE A SETTINGS

Mode Auto

Ignition % 1% Mod Start % 80% <Prev Stage> <Next Stage> Copy Settings

BACK ▲ ▼ SELECT

Sequencing Boiler Stage Menu

STAGE A SETTINGS

Mode Auto

BACK ▲ ▼ SELECT

RUNPROGRAM

STAGE A MODE

Auto

Standby Manual Off On

BACK ▲ ▼ SAVE

M4-LHS Installation and Operation Manual

HT# 059295-00 A

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

boilers.

Standby Standby boilers can only be activated when all boilers in Auto have been at 100% modulation or at High re for the full

Standby Time. Standby is generally used when you want a specic boiler to be available in extreme load conditions. Note

that a Standby boiler Cannot be a Lead boiler.

Manual Available For modulating boilers only. The Manual Mode should only be used when testing a boiler. Manual overrides the

Prove input. For modulating boilers, 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. See "Boiler Status" on page 38.

Off Any stage output not connected to a physical stage should be set to Off. The Off Mode can also be used to disable units

that are being serviced.

On This mode should only be used when testing a boiler. This mode overrides the PROVE input, Season setting, Shutdown or

Tstat status, and Sensor Fault status. Once set to On the boiler will immediately start ring at its highest rate.

Ignition %

(Modulating Boilers Only)

0-10VDCAdjustablefrom1%to50% Default:1% 1-10VDCCustomAdjustablefrom5%to70% Default:25%

Button: STAGE/Ignition %

• The Ignition % of a boiler is the lowest percent of modulation that boiler can achieve. That

is for the 4-20mA and 0-10VDC if the Ignition % was set to 20%, the 0-10VDC terminals will output 2VDC. The 4-20mA terminals will output 7.2mA.

• The 1-10V custom boiler types will use the Ignition % when the boiler is activated. In this

case, the Ignition % will be the level at which the control will output 1VDC.

• During the Soft-Off Delay, the boiler will remain at the Ignition % before turning Off.

- IGNITION POINT -

[ ]

BACK ▲ ▼ SAVE

Modulation Start %

(Modulating Boilers Only)

Adjustablefrom0%to100% Default:75%

Button: STAGE/Mod Start %

• The Modulation Start determines at what modulation percent the previous boiler (lead boiler) should be for the lag boiler to be activated.

• For example, if the Modulation Start for Boiler B is set to 50%, then when Boiler A reaches 75% modulation (50% Mod Start % + 25% Ignition % = 75%), Boiler B will be brought on.

• When modulation is decreasing, the lag unit will remain on at the Ignition % modulation until the previous boiler reaches 40% of

lag boiler's Modulation Start, or 2% above the Ignition Point, whichever is higher.

• Using the same example, as the load decreases, Boiler B will modulate down to its Ignition %. Boiler A will then modulate down to 30% (75% x 40%). Only then will Boiler B turn off.

• If the Lag Delay is set to anything other than 0, the lead boiler must reach 100% modulation before the lag boiler is activated.

However, the Modulation Start % should still be set correctly, because it will be valid when modulation is decreasing. "Lag Delay" on page 33

• Laars suggests that when Parallel is selected as the Modulation Mode to set the Modulation percent equal to or slightly higher than double the Ignition %. This way, the lag boiler will only start if the load is large enough for two boilers to run at the lowest modulation. See "Modulating Logic Overview" on page 4.

[ ]

BACK ▲ ▼ SAVE

STAGE A

25%

STAGE A

MODULATION START

75%

Copy Settings - Boiler A Only

(Modulating Boilers Only)

Button: STAGE/Copy Settings

• If all the active modulating boilers are to be set to the same Ignition % and Modulation %,

they can be set for Boiler A and then copied to the other modulating boilers.

• It is still required to select the Mode for all other boilers as the Mode is NOT copied.

ALERT

The Mode MUST be set for each boiler. The Copy Settings command will not set the

Mode for the remaining boilers. Only Ignition % and Modulation Start % are copied.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

-- COPY SETTINGS -From Stage A to

all other stages

BACK COPY

TROUBLESHOOTING

SENSOR INPUTS

Display shows Sensor OPEN or SHORT

When the display shows sensor OPEN, short the control sensor input terminals. The display

should change to read SHORT. This indicates that the sensor wires are not continuous. If the display does not SHORT, the M4-LHS may be damaged.

When the display shows sensor SHORT, remove the wires from the sensor terminals. The

display should change to read OPEN. In this case, replace the sensor. Otherwise, if the display does not show OPEN, the M4-LHS may be damaged.

Display shows an Incorrect Temperature

Remove the wires from the sensor terminals. The display should change to read OPEN. If it

does not, the M4-LHS may be damaged. Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the Temperature Sensor Chart. If it does not, the sensor may be damaged.

CONTROL OPERATION

No Heat

• Season- Make sure that the Season is set to Winter. See "Season" on page 27 and "Display Messages" on page 38.

• Prove- Even though, the system relay may be energized, the M4-LHS will not energize and

stage relays unless the Prove is shorted. See "Display Messages" on page 38 and "Wiring the

Prove" on page 13.

• Shutdown- The M4-LHS will deactivate stage outputs when the Shutdown terminals are

shorted. See "Display Messages" on page 38 and "Wiring the Shutdown, Tstat, or Setback" on

page 12.

• Tstat- The M4-LHS will deactivate stage outputs when the Tstat terminals are open. See

"Display Messages" on page 38 and "Wiring the Shutdown, Tstat, or Setback" on page 12.

• SensorFault- When the Sensor Fault is set to All Off in the startup menu, the System sensor fault (in all Sensor Type modes) or the Outdoor sensor fault (in Reset mode) will de-energize all stage relays. See "Display Messages" on page 38 and "Sensor Fault" on page 25.

• SystemorOutdoorSensor- If the System or Outdoor sensor reading was higher that the actual temperature, the M4-LHS might not bring any stage on. Check "Display shows an Incorrect Temperature" section.

• OutdoorCutoff- If the Outdoor cutoff was set too low, the building might be allowed to

cool more than is desired. A comfortable setting is between 60°F to 65°F. "Outdoor Cutoff

Temperature" on page 30

Too Much Heat

• IndirectDomesticHotWatercall- The M4-LHS will raise the temperature of the system to the

DHW Set Point 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 conditions, adjust the

Reset Ratio and Offset. See "Outdoor Reset Concept" on page 5. If excessive heat occurs year

round, reduce the Offset.

• BoilerModeSettings- The M4-LHS will only controls boilers their mode is set to Auto or Standby. Check if any boiler stage is set to Manual or On. See "Mode" on page 39.

• 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. See"Last Stage Hold" on page 32.

Temperature Sensor Chart

TEMPERATURE

°F °C

OPEN 150000

-30 -34 117720

-20 -29 82823

-10 -23 59076

0 -18 42683

10 -12 31215

20 -7 23089

25 -4 19939

30 -1 17264

35 2 14985

40 4 13040

45 7 11374

50 10 9944

55 13 8714

60 16 7653

70 21 5941

80 27 4649

90 32 3667

100 38 2914

110 43 2332

120 49 1879

130 54 1524

140 60 1243

150 66 1021

160 71 842

170 77 699

180 82 583

190 88 489

200 93 412

210 99 349

220 104 297

230 110 253

240 116 217

250 121 187

SHORT 100

Value

(in Ohms)

M4-LHS Installation and Operation Manual

HT# 059295-00 A

Too Little Heat

• ResetRatioandOffset- If reduced heat occurs only in certain weather conditions, adjust the

Reset Ratio and Offset (See "Outdoor Reset Concept" on page 5). If reduced heat occurs year

round, increase the Offset.

• SetbackandDay/NightSchedule- If reduced heat occurs only during specic hours, check the

Day/Night Schedule and the Setback values. Then, reduce the Setback setting. See "Setback" on page 31.

• BoilerModeSettings- The M4-LHS will only control boilers their mode is set to Auto or Standby. Check if any boiler stage is set to Manual, Off, or Standby. See "Mode" on page 39.

Boilers are Short-Cycling

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

• MinimumRuntime- Increase the Minimum Runtime only if staging 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

ModulatingBoilers

• Gain- If when using modulating boilers the system is overshooting reduce the Gain. See "Gain"

on page 33.

• Gain- If when using modulating boilers the system is undershooting increase the Gain.

StagingBoilers

• ReactionTime- If when using staging boilers the system is overshooting increase the Reaction

Time. As the stages will be turning on faster than they are affecting the system. If the system was undershooting for long periods, reduce the Reaction Time. See "Reaction Time" on page 34.

• MinimumRuntime- If when using staging boilers the system is overshooting reduce the Minimum Run Time. If the system was undershooting, increase the reaction time as it is turning off stages quicker than needed. See "Minimum Runtime" on page 34.

HT# 059295-00 A

M4-LHS Installation and Operation Manual

SPECIFICATIONS

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

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

OperatingTemperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20°F/-6°C to 130°F/54°C

OperatingHumidity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20% to 80% non-condensing

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

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

M4-LHS SPECIFICATIONS

SwitchBetweenBoilerGroupsMode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using Target Temperature

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

PumpOutput: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 N.O. S.P.S.T

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

StagingBoilerModes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto, Standby, On, Off

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

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

SequencingOutputTypes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . On/Off, 2-Stage, 3-Stage, or 4-Stage

OutputRelayRatings: . . . . . . . . . . 1 Amp inductive (⅛ HP), 6 Amp resistive at 120 VAC 60 Hz, 15 A total for all circuits

Add-OnExtensionPanels: . . . . . . . . . . . . . . . . . . . . . . . . up two Extension Panels using RS485 (RJ45 or RJ11)

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

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

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

SequencingModes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lo/Hi/Lo/Hi or Lo/lo/Hi/Hi

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

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

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

ControlSensorRanges:. . . . . . . . . . . . . . . . . . . . . Outdoor Temperature sensor - minus 35°F/-37°C to 250°F/121°C

Heating system sensor - minus 35°F/-37°C to 250°F/121°C

OutdoorCutoffRange: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20°F/-6°C to 100°F, ON and OFF

ResetRatioRange: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1:4) to (4:1) (Outdoor : System Water)

OffsetAdjustment: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .minus -40°F°/-22°C° to plus 40°F°/22°C°

MinimumWaterTemperature: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50°F/10°C to 170°F/77°C

MaximumWaterTemperature:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90°F/32°C to 240°F/116°C

Indirect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) setting per day

NightSetback: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°F°/0°C° to 75°F°/42°C°

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

ExternalInputs: . . . . . . . . . . . . Shutdown, Tstat, and Setback Input, and Prove and DHW Call Input. (Dry Contacts Only)

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

EXTENSION SPECIFICATIONS

(EachExtensioncanaddupto(6)additionalboilerstages.AmaximumoftwoExtensionscanbeused.)

ExtensionNumbering: . . . . . . . . . . . .Toggle Switch A (Stages E - J, LEDs are Green) or B (Stages K - P, LEDs are Red)

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

ModulatingOutputTypes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (6) 4-20mA and 0-10V

OutputRelayRatings: . . . . . . . . . . 1 Amp inductive (⅛ HP), 6 Amp resistive at 120 VAC 60 Hz, 15 A total for all circuits

ConnectiontoM4-LHSandanotherextension: . . Two RS485 connections using 6 wire RJ11 cable (Cable is provided)

M4-LHS Installation and Operation Manual

HT# 059295-00 A

1=SHUTDOWN,2=NO TSTAT CALL,3=PROVE FAILURE,4=

PURGE DLEAY,5=WAITING FOR PROVE,6=SENSOR FAULT,7=

LAG DELAY, 8=LAST STAGE HOLD,9=DHW CALL,10 = SYSTEM

RUNON,11=SUMMER,12=OUTDOOR CUTOFF,13=BOOST

MODE,14=SETBACK MODE,15 = NORMAL OPERATION

1 =1.00 OD = 4.00 Sys,2 =1.00 OD = 3.00 Sys,3 =1.00 OD = 2.00 Sys, 4

=1.00 OD = 1.50 Sys,5 =1.00 OD = 1.25 Sys,6 =1.00 OD = 1.00 Sys,,7

=1.25 OD = 1.00 Sys,8 =1.50 OD = 1.00 Sys,9 =2.00 OD = 1.00 Sys,10

=3.00 OD = 1.00 Sys,11 = 4.00 OD = 1.00 Sys

False True True = Energized, False = De-Engergized

RY0 - RY Max

Stages

BINARY-VALUE Read Only

2800 - Max

Stages

Hybrid Object ID Object Type Object Value Object Name Units Minimum Maximum Denition

HYBRID - OUTDOOR RESET - BACNET VARIABLE LIST

Model Device Object Read Only MODEL

Serial Number Device Object Read Only SNUMBER

Version Device Object Read Only VERSION

Operation Mode 100 MULTISTATE-VALUE Read Only OPMODE 1 3 1= Hybrid, 2 = Modulation Setpoint, 3 = Modulation Reset

Outdoor Temperature 200 ANALOG-VALUE Read Only ODTEMP Degree F 32000=OPEN,3201=SHORT

System Temperature 300 ANALOG-VALUE Read Only SYSSEN Degree F 32000=OPEN,3201=SHORT

Control Status 400 MULTISTATE-VALUE Read Only CSTAT 1 15

Season 500 MULTISTATE-VALUE Read/Write SEA 1 2 1= Winter, 2= Summer

Reset Ratio 600 MULTISTATE-VALUE Read/Write RR 1 11

Offset 700 ANALOG-VALUE Read/Write OFF Degree F -50 50 Integer Values Only (-1,0,1,2…)

Outdoor Cutoff 800 ANALOG-VALUE Read/Write CO Degree F 19 101 Integer Values Only (19,20,21…)

Min Water Temp 900 ANALOG-VALUE Read/Write MINW Degree F 50 180 Integer Values Only (50,51,52…)

Max Water Temp 1000 ANALOG-VALUE Read/Write MAXW Degree F 70 220 Integer Values Only (70,71,72…)

Setback 1100 ANALOG-VALUE Read/Write SB Degree F 0 75 Integer Values Only (0,1,2…)

Purge Delay 1200 ANALOG-VALUE Read/Write PDLY Minutes .1 10 .1 thru .9 after Integer Values Only (1,2…)

System Runon 1300 ANALOG-VALUE Read/Write RUNON Minutes 0 360 Integer Values Only (0,1,2…)

Rotation Time 1400 ANALOG-VALUE Read/Write RTTIME Hours 1 1440 Hours since last rotation Integer Values Only (1,2,3…)

Standby Time 1500 ANALOG-VALUE Read/Write STBYDLY Minutes 1 60 Integer Values Only (1,2,3…)

Last Stage Hold 1600 ANALOG-VALUE Read/Write LSTHOLD Degree F 0 30 Integer Values Only (0,1,2…)

Con Lead Stage 1700 MULTISTATE-VALUE Read/Write CLEAD 1 16 Represent the current lead boiler for the condensing group

Non-Con Lead Stage 1800 MULTISTATE-VALUE Read/Write NCLEAD 1 16 Represent the current lead boiler for the non-condensing group

Reaction Time 1900 ANALOG-VALUE Read/Write RETIME Minutes 1 10 Integer Values Only (1,2,3…)

Min Run Time 2000 ANALOG-VALUE Read/Write MINRUN Minutes 1 60 Integer Values Only (1,2,3…)

Gain 2100 MULTISTATE-VALUE Read/Write GAIN 1 10

Lag Delay 2200 ANALOG-VALUE Read/Write LAGDLY Minutes 0 60 Integer Values Only (0,1,2…)

Soft off 2300 ANALOG-VALUE Read/Write SOFF Seconds 0 60 Integer Values Only (0,1,2…)

Set Time 2400 ANALOG-VALUE Read/Write PTIME Minutes 1 1440 Time since midnight Integer Values Only (1,2,3…)

Day Schedule 2500 ANALOG-VALUE Read/Write DSCHED Minutes 1 1440 Time since midnight Integer Values Only (1,2,3…)

Night Schedule 2600 ANALOG-VALUE Read/Write NSCHED Minutes 1 1440 Time since midnight Integer Values Only (1,2,3…)

System Relay 2700 BINARY-VALUE Read Only SYSRLY False True True = Energized, False = De-Engergized

Output Relays

HT# 059295-00 A

M4-LHS Installation and Operation Manual

1=SHUTDOWN,2=NO TSTAT CALL,3=PROVE FAILURE,4=

PURGE DLEAY,5=WAITING FOR PROVE,6=SENSOR FAULT,7=

LAG DELAY, 8=LAST STAGE HOLD,9=DHW CALL,10 = SYSTEM

RUNON,11=SUMMER,12=OUTDOOR CUTOFF,13=BOOST

MODE,14=SETBACK MODE,15 = NORMAL OPERATION

1 =1.00 OD = 4.00 Sys,2 =1.00 OD = 3.00 Sys,3 =1.00 OD = 2.00 Sys, 4

=1.00 OD = 1.50 Sys,5 =1.00 OD = 1.25 Sys,6 =1.00 OD = 1.00 Sys,,7

=1.25 OD = 1.00 Sys,8 =1.50 OD = 1.00 Sys,9 =2.00 OD = 1.00 Sys,10

=3.00 OD = 1.00 Sys,11 = 4.00 OD = 1.00 Sys

False True True = Energized, False = De-Engergized

RY0 - RY Max

Stages

Hybrid Object ID Object Type Object Value Object Name Units Minimum Maximum Denition

MODULATION - OUTDOOR RESET - BACNET VARIABLE LIST