Bryan Boilers Concert Instruction And Operation Manual

Concert Boiler Control Instruction & Operation Manual

Page 1 of 68

Concert

TM

Boiler

Control

Instruction and Operation

Manual

Form 105975-01; Revision 7

April 15, 2016

Contents
Introduction

Quick Reference 2
Overview 3

Product Features

Boiler Sequence 5
Protection Features 7
Single Boiler Control 9
Multiple Boiler Control Sequencer 10

Front Panel

General Navigation 13
Status Screens 14

Installation

Quick Setup 16
Terminal Layout 17
Boiler-To-Boiler Network 19
Energy Management Interface 20

Setup & Tuning

Manual Operation 28
Parameter Adjustment 29
Response Tuning 42

Trouble Shooting

General Issues 46
Sensor Status 48
Limit String Status 49
Soft Lockouts (Holds) 50
Hard Lockouts 52

Using Archives 55

Specifications

General 60
Parameter Summary 62

Application
The Concert

TM

Boiler Control (Control) has been
designed for commercial hot water boiler
applications.

Intent
This instruction manual includes detailed
functional, installation and setup information.
The intended users are application engineers,
I&O manual and brochure writers, development
and specifying engineers and installing
contractors.

Figure 1: Control Front Panel

(Showing Home Screen)

Figure 2: Control

783 N Chili Ave

Peru, IN 46970

Telephone [phone]
Fax [phone]

www.bryanboilers.com

Concert Boiler Control Instruction & Operation Manual

Page 2 of 68

Introduction

Quick Reference

Application

Single

Boiler

Multiple

Boilers

Energy Management System (EMS)

Boiler Control

Manual

Operation

Single Boiler

Setpoint Input

Multiple Boilers

Setpoint Input

Modulation

Rate Input

Setpoint

Temperature

Sensor

Supply

Header

Supply

Header

Ignored

Ignored

Setpoint

Operator

Operator

Input J8 (6-7)

or Modbus*

Input J8 (6-7)

or Modbus*

Ignored

Ignored

“On” and

“Off” Point

Operator

Operator

Operator

Operator

Ignored

Ignored

Outdoor Air

Reset

Option

Option

Ignored

Ignored

Ignored

Ignored

Domestic

Hot Water

Priority

(DHWP)

Option

Option

Ignored

Ignored

Ignored

Ignored

Warm

Weather

Shutdown

(WWSD)

Option

Option

Option

Option

Option

Ignored

Call For

Heat

Call For Heat

Based on
Setpoints

Based on
Setpoints

Based on
Setpoints

Based on
Setpoints

Input (RO) or

Modbus

Based on
Setpoints

Modulation

Rate

Firing Rate

Demand

Internal

From

Sequence

Master

Internal

From

Sequence

Master

Input 4-

20mAdc or

Modbus*

Ignored

Remote

Connection

External

Enable/
Disable

Enable/

Disable

Enable/
Disable

Enable/
Disable

Enable/
Disable

On/Off

Ignored

Remote

Control
Input J8 (6-7)
or Modbus*

No

No

Remote

Setpoint

Remote

Setpoint

Remote

Modulation

Ignored

Additional

Information

Page 9

Page 10

Page 20

Page 20

Page 20

Page 28

Table 1: Quick Reference
* Both Peer-To-Peer Network and Modbus Remote Control may be used at the same time.

Concert Boiler Control Instruction & Operation Manual

Page 3 of 68

Introduction

Overview

Boiler Control
The Concert Boiler Control (Control) contains
features and capabilities which help improve
heating system operation, and efficiency. By
including unique capabilities, the Control can do
more, with less field wiring, and fewer aftermarket
controls and components – improving the
operation of both new and replacement boiler
installations.

Advanced Touch Screen Display
Boiler status and setup selections are available
from an easy to use, full color, Touch Screen
Display. In the event of a fault condition the user is
guided by blinking touch buttons to help screens
that explain the problem, cause, and corrective
action. Operation evaluation and problem-solving
is enhanced by historical capability including
graphic trends, lockout history records, as well as
boiler and circulator cycle counts and run time
hours.

Archives
Evaluation, optimization, and troubleshooting are
enhanced by the collection of an operational
record. Operation history is provided by major
variable historical trending, time and day stamped
alarms, lockout history, cycles, run hours, and
boiler loading profiles. These tools may be used
on site our downloaded to a thumb drive for review
off site.

Advanced Modulating Control
The Control modulates the boiler input by varying
the fan speed. As the fan speed increases, so
does the amount of fuel gas drawn into the blower.
As a result, a fairly constant air-fuel ratio is
maintained across all inputs. The Control
determines the input needed by looking at both
current and recent differences between the
measured temperature and the setpoint
temperature. As the measured temperature
approaches the setpoint temperature, the fan will
slow down and the input will drop. The Control also
utilizes boiler return water and flue gas
temperatures to adjust fan speed.

Built-in Safety Control
The Control includes safety controls designed to
ensure safe and reliable operation. In addition to

flame safety controls the Control includes supply
water temperature, differential water temperature,
and stack temperature safety limits, as well as
stepped modulation responses. Boiler modulation is
adjusted when required to help avoid loss of boiler
operation due to exceeding limits. Additionally, the
Control monitors the safety limits and displays
cause of boiler alarm trip and start delay.

Outdoor Air Reset
When selected the active setpoint is automatically
adjusted based on outside air temperature, time of
day, and length of demand (boost) settings.
Outdoor air “reset” setpoint saves fuel by adjusting
the water temperature of a heating boiler lower as
the outside air temperature increases.

Auxiliary Equipment Control
The Control may be used to sequence the domestic
hot water, boiler and system circulators, or fresh air
damper. Circulators are automatically run for a 20
second exercise period after not being used for
longer than 7 days. Circulator exercise helps
prevent pump motor shaft seizing.

Energy Management System (EMS) Interface
The control accepts a 4-20mAdc input from the EMS
system for either direct modulation rate or setpoint.
A factory configured RS485 Modbus interface is
available for Energy Management System (EMS)
monitoring or control. Additionally the boiler Multiple
Boiler Sequencer Peer-To- Peer Network may be
used at the same time the EMS is monitoring and
providing setpoint over the Modbus network.

Multiple Boiler Peer-To-Peer Network
The Control includes state-of-the-art modulating
lead- lag sequencer for up to eight (8) boilers,
capable of auto rotation, outdoor reset, and peer-to­peer communication. The peer-to-peer network is
truly “plug and play”. Communication is activated by
simply connecting a RJ45 Ethernet cable between
boilers. The Control provides precise boiler
coordination by sequencing boilers based on both
header water temperature and boiler modulation
rate. For example, the lead boiler can be configured
to start a lag boiler after operating at 50%
modulation rate for longer than an adjustable time.
The boilers are modulated in “unison” (parallel)
modulation rate to ensure even heat distribution.

Introduction

Overview

Boiler Control Instruction & Operation Manual

Page 4 of 68

Return Water

Stack

System Pump

Domestic Hot

Water Pump

Header

Temperature Sensor

Domestic Hot Water
Temperature Sensor

or Switch

System

Supply Water

Domestic

Hot Water

Supply

Water Flow

Switch

Stack

Temperature

Sensor

Boiler Pump

Outside Air

Temperature

Sensor

Return

Temperature

Sensor

Building Automation

System

Hardwired Connections

Boiler On/Off

Switch

Low Water Cutoff Switch

High Limit Auto Reset Supply

Supply Temperature Sensor

Vestibule and Burner
Thermal Fuses

Min. & Max Air Press Switches

Variable

M

Combustion Air

Damper

Fresh Air

Supply

- Lockout Indicator

- Enable/Disable Input

- Boiler Running Contact (Optional)

- Remote Firing Rate 4-20mAdc

- Remote Setpoint 4-20mAdc

Flame Rod

Ignition
Transformer

FAN

Speed Fan

Boiler

Jacket

Modbus RS-485 Monitoring & Control:

- Enable/Disable

- Remote Firing Rate

- Remote Setpoint

Blocked Condensate Drain

Gas

Valve

Low & High

Gas Pressure

Switches

Fuel

Supply

Figure 3: Boiler Control

Product Features
Boiler Sequence

Boiler Control Instruction & Operation Manual

Page 5 of 68

Figure 4: Home Screen Details

Priority

Display

Boiler Responding to:

1st

Sequencer Control

The boiler is connected to the peer- to-peer network. The boiler accepts
demand from the Sequencer Master.

2nd

Domestic Hot Water

DHW call for heat is on and selected as the priority demand. DHW is
always higher priority than Central Heat. It also has higher priority than the
Sequencer Control when DHW priority is “enabled” and “Boiler Piped” IWH
is selected.

3rd

Central Heat

Central Heat call for heat is on and there is no DHW demand or DHW
priority time has expired.

4th

Frost Protection

Frost Protection is active and there is no other call for heat. Frost protection
will be a higher priority than Sequencer Control if the Sequence Master has
no active call for heat.

5th

Warm Weather

Shutdown (WWSD)

WWSD is active and the boiler will not respond to central heat demands.
DHW demand is not blocked by WWSD.

Boiler “Priority”

The Control accepts a call for heat (demand) from multiple places and responds according to the “Priority.”
When more than 1 demand is present the higher priority demand is used to determine active boiler
settings. For example, when Domestic Hot Water (DHW) has priority the setpoint, “Diff Above”, “Diff
Below” and pump settings are taken from DHW selections. Active “Priority” is displayed on the “Home”
screen above. Priority Order is shown in Table 2.

Table 2: Order of Priority

Product Features
Boiler Sequence

Boiler Control Instruction & Operation Manual

Page 6 of 68

Standby

Drive Purge

Prepurge

Drive Lightoff

Direct Ignition

Boiler Running

Fan Post Purge

Pump Overrun

Time

Boiler Sequence Status is shown on both the Home screen and the Status Screen. Once limits have been

Status:

Description

Standby

Boiler is not firing. Appropriate circulators are “On” if “Priority” is not standby. There is a
Central Heat call for heat and the Supply temperature is greater than setpoint minus the
“Diff Below”.

Prepurge

When supply temperature drops below setpoint minus the “Diff Below,” burner demand
continues with following Status shown:

Safe Startup: Flame circuit is tested.
Drive purge: The blower is driven to the fan purge speed.
Prepurge: After the blower reaches the fan purge speed setting the 30 second

combustion chamber purge is conducted.

Direct

Ignition

After purge time is complete the following Status is shown:

Drive light-off: The blower is driven to light-off rate.
Pre-Ignition Test: After the blower reaches light-off rate a safety relay test is conducted.
Pre-ignition: Spark is energized and it is confirmed that no flame is present.
Direct Ignition: Spark and Main fuel valve are energized.

Running

After the flame is proven the sequence continues with run stabilization and, when
selected, low fire hold time and slow start ramp. Once the field adjustable low fire hold
time and ramp rate is completed normal boiler operation begins, modulation rate
depending on temperature and setpoint selections.

Post-

purge

When the call for heat ends the main fuel valve is closed and the blower is driven to the
fan post-purge speed. After the blower reaches the fan post-purge speed setting the 5
minute second combustion chamber purge is conducted.

established the boiler start/stop sequence progresses as show in the graph below;

Boiler

“Status”

Shown on Display:

CH Maximum Modulation

Minimum Modulation

Symbol Legend

Adjustable parameters are

shown in shaded box:

Adjustable Parameter

Purge Rate

Lightoff Rate

CH Low Fire Hold Rate

30s 4s 1 minute

Run

Stabilization

Time

Low Fire

Hold
Time

CH Low Fire

Hold Time

(Note; refer to Parameter Adjustment for additional information.)

Figure 5: Central Heat Start sequence (Typical for Domestic Hot Water)

Table 3: Boiler Sequence

Slow
Start

Ramp

Released

to

Modulate

Postpurge

Rate

Slow Start Ramp Rate

Slow Start Enable

Slow Start Degrees

5 minute

Pump

Overrun

Time

Boiler Control Instruction & Operation Manual

Page 7 of 68

Product Features

Boiler Protection Features

Device

Start

Temperatures

Stop

Temperatures

Boiler &

System

Pump

Outside Air < 32°F

Supply Water < 45°F

Outside Air > 36°F

Supply Water > 50°F

Boiler

Supply Water < 38°F

Supply Water > 50°F

Supply Water Temperature High Limit
The Control is equipped with internal operating
control and high limit features. The Control
monitors a dual element temperature sensor that
is mounted in the supply water manifold and
provides UL353 and UL1998 internal safety
algorithms. If supply water temperature increases
above the active setpoint plus diff above, default
180°F (82°C) (maximum setting 190°F (88°C)) the
boiler is cycled off. If the temperature exceeds
210°F (99°C), a manual reset hard lockout results.
Additionally, the supply temperature is monitored
by a L4008A High Limit Aquastat set to recycle the
boiler at 195°F with a 5°F differential.

Stepped Modulation

temperature for longer than a limit time delay, the
Control shuts down the boiler and delays restart.
If the inverted temperature is detected more than
five times the boiler manual reset Hard Lockout is
set. This condition is the result of incorrectly
attaching the supply and return piping.

Stack High Limit
The Control monitors a dual element temperature
sensor that is mounted in the boiler vent connector
and provides UL353 and UL1998 internal safety
algorithms. If the flue temperature exceeds 210°F
(99°C), the control begins to reduce the maximum
blower modulation. If the flue temperature exceeds
220°F (104°C), a forced boiler recycle results. If
the flue temperature exceeds 230°F (110°C), the
boiler manual reset Hard Lockout is set.

While the boiler is a slave responding to the
internal Multiple Boiler Control Peer-Peer Network,
an Energy Management System (EMS) demand,
or has Header sensor selected as Central Heat
Modulation Sensor the Control still monitors
supply water temperature to prevent boiler over
firing. The boilers maximum modulation is
reduced from 100 to 0% if the supply water
temperature increases from 190°F (88°C) to 200°F
(93°C). If supply water temperature exceeds
200°F (93°C) a forced recycle results.

Sequence Master Stop All Boilers
All boilers are stopped without delay if the Call for
Heat input is removed or if the header temperature
is higher than 195°F (90.6°C) (field adjustable).

High Differential Temperature Limit
The Control monitors the temperature difference
between the return and supply sensors. If this
difference exceeds 80°F (45°C) the control begins
to reduce the maximum blower modulation. If
temperature difference exceeds 90°F (50°C) a
forced boiler recycle results. If the temperature
difference exceeds 100°F (56°C) the control will
shut the unit down. The unit will restart
automatically once the temperature difference has
decreased and the minimum off time has expired.
If the differential temperature exceeds the 100°F
limit ten times the boiler manual reset Hard
Lockout is set. Additionally, if the supply
temperature rises faster than the 4°F (2°C) per
second limit, a soft lockout is activated.

Return Higher Than Supply Temperature
The Control monitors the supply and return
temperature sensors. If the return water
temperature exceeds the supply water

Ignition Failure
The Control uses an external igniter. The Control
monitors ignition using a burner mounted flame
sensor. In the event of an ignition failure, the
control will recycle. If ignition fails after a single
retry, a manual reset Hard Lockout is set.

Central Heating System Frost Protection
When enabled, Frost Protection starts the boiler
and system pump and fires the boiler when low
outside air and low supply water temperatures are
sensed. Outdoor Air setpoint is field adjustable.
The Control provides the following control action
when frost protection is enabled:

Table 4: Frost Protection

FROST PROTECTION NOTE

The Control helps provide freeze protection for
the boiler water. Boiler flue gas condensate
drain is not protected from freezing. Since the
Control may only cycle the system and boiler
circulators individual zones are not protected.
It is recommended that the boiler be installed in
a location that is not exposed to freezing
temperatures.

Product Features

Boiler Control Instruction & Operation

Manual

Page 8

of68

Relay Outputs

Inputs

Standby

CH Disabled

Standby

DHW Disabled

Standby

DHW Enabled

Standby

CH Enabled

Frost Protection

On

Lockout

LCI Open

Warm Weather

Shutdown

Standby

Limit Hold

Drive Purge

Prepurge

Drive Lightoff

Direct Ignition

Boiler Running

Pump Overrun

Time

Fan Post Purge

Boiler Sequence

Boiler

“Status”

Temp >Setpoint CH Enabled & Termp < Setpoint (lead boiler demand active)

Shown on Display:

ILK OFF

LCI OFF

Warm Weather
Shutdown

Frost Protection
On

CH Enabled

DHW Enabled

Blower Output

Alarm Relay

System Pump

DHW Pump

Lea d B

oiler

Isolation Valve

Boiler Pump

Notes

System Pump: Runs when boiler room has heat demand enabled. Is shut off when boiler is in Warm Weather Shutdown (WWSD).
DHW Pump: Runs when there is a domestic demand.
Isolation Valve: Opens boiler is a lead boiler and when the boiler has burner demand. Closes when the boiler is locked out or in WWWSD.
Boiler Pump: Runs when boiler has burner demand. Stops when the boiler is locked out or in WWSD.

Onl y

Product Features

Boiler Control Instruction & Operation

Manual

Page 9

of68

Boiler Protection Features

Limit

String

Type

Description

Action

STAT

Heat Demand

After a Heat demand is received, “ON” the control is enabled to fire to
maintain water temperature at setpoint.
 Heat demand may be received from “STAT” terminal for Central Heat

demand, “S6” terminal for Domestic Hot Water demand, the Sequence
Master, or EMS Modbus Inputs.

 A Heat Demand input ON initiates pumps and Fresh Air Damper outputs.

LCI

Load Control

Input

The boiler will not start if the LCI is OFF, when it is turned OFF during run the
boiler shuts down.

 Hold message is shown when LCI limit is OFF and Heat Demand ON.
 LCI Hold will never cause a manual reset lockout.
 Boiler may be disabled remotely by wiring an enable contact to the LCI

“External Limit” terminal s.

 When the Low Air Pressure Switch (APS) is proven OFF the LCI input

turns ON and initiates blower start. When Low APS fails to turn ON, the
control enters a manual reset Lockout state.

ILK

Interlock

The boiler will not start if the ILK is OFF. When it is turned OFF during run the
boiler enters a manual reset Lockout state.
 The ILK must be ON within 1 minute after the LCI is ON. This time allows

the blower to start and the air flow proving switch to turn ON. Failure to
close will cause a manual reset lockout

 ILK OFF Lockout cause the Lockout Alarm contact to turn ON.

Limit Devices
The control monitors individual limit devices as shown in Figure 6 below. If any of these limits open the
boiler will shut down and an open limit indication is provided. Additionally, the control monitors an air
proving switch.

Note

During the boiler start sequence the

STAT S6: Domestic Hot Water Demand OFF

Figure 6: Limit Monitoring Screen Showing Central Heat Demand

Table 5: Limit String

control requires the Air Proving Switch,
“API” to be “OFF” before the blower
starts and in the “ON” position after the
blower starts. If the API is not in the
required position the start sequence is
halted or the boiler is shut down and
the “Low Air Pressure” OFF limit
indication is provided.

Product Features

Boiler Control Instruction & Operation

Manual

Single Boiler Control

Control Options
 Modulating Sensors

1. Supply

2. Header

3. Domestic Hot Water

 Modulation Setpoint

- Outdoor Air Reset

- Warm Weather Shutdown

- Frost Protection

- EMS interface

 Device Control

- Boiler, System & Domestic pumps

- Fresh Air Damper

Water

System

Circulator

DHW

Circulator

Return

Figure 7: Single Boiler Hydronic Options

Header

Temperature

DHW

Temperature

Sensor

Switch

Options

or

Modulation Setpoint
The Control starts and stops the boiler and
modulates the boiler input from minimum
(MBH) to maximum (MBH) in order to heat
water to the active setpoint. The setpoint is
determined by the priority (Domestic Hot
Water, Central Heat, Frost Protection and
Warm Weather Shutdown) and as described
in the following paragraphs

Central Heat
User may select the Supply sensor or Header
Sensor as the Modulation Sensor. Upon a
Central Heat call for heat the setpoint is either
the user entered Central Heat Setpoint, or
automatically adjusted by Outdoor Air Reset,
Energy Management System (EMS), supplied
4-20mAdc, or Modbus setpoint input.

Outdoor Air Reset
When selected the modulation rate setpoint is
automatically adjusted based on outside air
temperature, time of day input and demand
duration (boost) settings. Outdoor air “reset”
setpoint saves fuel by adjusting the active
setpoint of a heating boiler lower as the
outside air temperature increases.

entered DHW setpoint or the time of day input DHW
setpoint. The optimal value of this setpoint is established
based on the requirements of the indirect water heater.

Domestic Hot Water Priority (DHWP)
Some boilers are used primarily for building space
heating, but also provide heat for the domestic hot water
users. When the outdoor temperature is warm, the
outdoor reset setpoint may drop lower than a desirable
domestic hot water temperature. Also, often it is required
to quickly recover the indirect water heater. When
DHWP is enabled, heating circulators are stopped, the
domestic circulator is started and the domestic hot water
setpoint is established in response to a domestic hot
water demand. Priority protection is provided to allow the
heating loop to be serviced again in the event of an
excessively long domestic hot water call for heat.

Device Control
The Control may be used to sequence the domestic hot
water, boiler and system circulators or fresh air damper.

Selecting This Control Mode
To select single boiler control set the following:

Press Adjust Menu > Sequence Master;

Select Sequence Master = Disabled.

Domestic Hot Water (DHW) Setpoint
User May select the Supply sensor or DHW
Sensor as Modulation Sensor. Upon a DHW
call for heat the setpoint is either the user

Press Main Menu > EMS Interface > Remote Demand;

Select Modulating Source = Local.

Page 10

of 68

Boiler Control Instruction & Operation

Manual

Product Features
Multiple Boiler Control Sequencer

Control Options

 Modulating Sensors

1. Header

 Modulation Setpoint

- Outdoor Air Reset

- Warm Weather Shutdown

- Frost Protection

- EMS interface

 Device Control

- Boiler, System & Domestic
pumps

- Fresh Air Damper

Return

Water

Connects to

Up to Eight

Boilers

Figure 8: Multiple Boiler Hydronic Options

System

Circulator

DHW

Circulator

Header

Temperature

DHW

Temperature

Switch

ONLY

Sequencer Master

A single Control is parameter selected to be the
Sequencer Master. The Sequence Master does
not rotate. The call for heat, outdoor and header
sensors, and common pumps are wired to the
Sequencer Master “enabled” Control.

Lead/Slave Sequencing
The Sequence Master is independent of the
“Lead” boiler. One boiler is a “Lead” boiler and the
remaining networked boilers are “Slaves”. When
demand is increasing, the Lead boiler is the first to
start and the Slave boilers are started in
sequential order (1, 2, 3,…) until the demand is
satisfied. When demand is decreasing, the boilers
are stopped in reverse order with the Lead boiler
stopped last (…, 3, 2, 1). To equalize the run time
the sequencer automatically rotates the Lead
boiler after 24 hours of run time.

Customized Sequences
Normally, boilers are started and stopped in
numerical order. However, custom sequences
may be established to optimize the heat delivery.
For example, in order to minimize boiler cycling, a
large boiler may be selected to run first during
winter months and then selected to run last for the
remainder of the year.

DHW Two boiler Start
When the Indirect Water Heater (IWH) parameter
is set to “Primary Piped” and the DHW Two Boiler
Start parameter is set to “Enabled” two boilers are
started without delay in response to a DHW call for
heat. This feature allows rapid recovery of large
IWH’s and multiple IWH’s.

Shared or Isolated DHW Demand
When the Indirect Water Heater (IWH) parameter
is set to “Primary Piped” the Sequence Master
sequences all required boilers to satisfy the DHW
setpoint (default 180°F (82.2°C). When “Boiler
Piped” is selected only the individual slave boiler,
with the wired DHW demand and pump, fires to
satisfy the DHW setpoint.

Multiple Demands
The Sequence Master responds to Central Heat,
DHW and frost protection demands similar to the
stand alone boiler. For example, when selected
and DHW priority is active, the sequence master
uses DHW setpoint, “Diff Above”, “Diff Below” and
pump settings. However, the Sequence Master
always uses the Header sensor and does not use
the DHW Sensor.

Optimized Boiler Modulation
Boiler firing rate is managed to increase smoothly
as boilers are started. For example, when a
second boiler is started the initial firing rate is
100%/2 or 50%, when the third boiler is started the
firing rate starts at 200%/3 or 66%. After the initial
start, the Sequence Master develops a unison
firing rate demand based on its setpoint and
header temperature.

Selecting This Control Mode
Under Adjust Menu, select Sequence Masterr and
then select Sequence Master Enable.

Page 11

of 68

Boiler Control Instruction & Operation

Manual

Product Features
Multiple Boiler Control Sequencer (continued)

PLANT LOAD

(# BOILERS REQURED)

BOILER

FIRING RATE

SYSTEM

TEMPERATURE

During low loads, the Sequence Master limits firing rates to a “Base Load Rate” to ensure modulating
condensing boiler peak operating efficiency. Lower firing rates boost efficiency by helping increase the
amount of flue gas water vapor condensation. The Control maintains a “Base Load Rate” until the last
lag boiler is started. At this point, the “Base Load Common Rate” is released to allow boilers to
modulate as required to meet heat load.

185

Setpoint 180

Base Load

Rate Default

40% Range

(25 – 100%)

175

100

40

2

Fast

Load

Change

2

3

Slow
Load

Change

4 4

5

1

0

3
2
1
0

5

Start

Lead Boiler

Start

st

1

Lag

Figure 9: Boiler Start and Stop Peer-To-Peer Network Sequence Diagram

(3 boiler system shown, typical for up to 8 boilers)

Advanced Boiler Sequencing
After there is a Call for Heat input,
both header water temperature and
boiler firing rate percent are used to
start and stop the networked
boilers. The control starts and stops
boilers when the water temperature
is outside the user selected
“Difference Above” and “Difference
Below” settings. Also, in order to
minimize temperature deviations,
the control adjusts the number of
boilers running based on the firing
rate. This combination allows the
boilers to anticipate slow load
changes before they disrupt water
temperature, yet still respond
quickly to sudden load changes.
These special sequencer features
help reduce energy wasting system
temperature swings and the
resulting unnecessary boiler
cycling.

Start

nd

2

Lag

2

Stop

nd

Lag

Stop

st

1

Lag

Stop

Lead Boiler

1

- Lead Boiler Start

Water temperature is below the setpoint by more than
the “On Point” differential.

2

- Temperature Based Lag Boiler Start

Water temperature is below the setpoint by more than
the “Difference Below” parameter for longer than the
adjustable time delay (“Boiler Start Delay” parameter).

3

- Modulation % Based Lag Boiler Start

The boiler modulation rate has been at the maximum
firing rate for longer than twenty minutes.

4

- Lag Boiler Stop

The boiler modulation rate has been at minimum fire for
longer than twenty minutes. Additionally, lag boilers are
stopped when water temperature is above the setpoint
by more than the “Difference Above” parameter for
longer than the “Boiler Stop Delay” parameter.

5

- Lead Boiler Stop
The last boiler remains on line until the water
temperature is above the setpoint more than the
“Difference Above” for longer than the time delay.

Page 12

of 68

Boiler Control Instruction & Operation

Manual

Product Features
Multiple Boiler Control Sequencer (continued)

Improved Availability - The following features help improve the heat availability:
Backup Header Sensor

In the event of a header sensor failure the lead boiler’s supply sensor is used by the Sequence Master
to control firing rate. This feature allows continued coordinated sequencer control even after a header
sensor failure.

Slave Boiler Rate Adjustment
Each slave boiler continues to monitor supply, return and flue gas temperatures and modifies the
Sequence Master’s firing rate demand to help avoid individual boiler faults, minimize boiler cycling and
provide heat to the building efficiently.

Slave Boiler Status Monitoring
The Sequence Master monitors slave boiler lockout status and automatically skips over disabled boilers

when starting a new slave boiler.
“Stand Alone” Operation Upon Master Failure

Individual boilers are configured to continue to operate in the event the Sequence Master Control is
powered down, disabled or Boiler-to-boiler communication is lost. The following are design
considerations for backup “Stand Alone” operation;

 Enable/Disable

Upon loss of the Sequence Master each boiler will automatically begin local control. This
means it will operate only if it has a call for heat. For this reason slave boilers should have their
“External Enable/Disable” J8 terminal 1 to 3 jumpered. In the event of loss of Sequence Master
the slave boiler will have demand to run.

 Modulation

Once running the Slave boiler will use the selected central heat modulation sensor and setpoint
to produce heat for the building. Optionally, slave boilers may have a separate header sensor
wired and select the “Central Heat Modulation Sensor” parameter as Header Sensor”. This will
allow continued header water temperature control.

 Pumping

Consideration must be given to how the system pump is powered. If the Sequence Master
enabled boiler is powered down, how will the system pump be operated? It may be required to
wire the system pump to multiple boilers.

Once the Sequence Master is restored to operation the individual boilers automatically resume their
position as sequencer slaves.

Page 13

of 68

Boiler Control Instruction & Operation

Manual

Front Panel

General Navigation

Figure 10: Main Menu

Main Menu

The Main Menu provides access to all display
functions. It is accessible from the Home
Screen. The following major user interface
areas are accessed from the Main Menu:

STATUS
Provide a “walk” through boiler operation. These
screens provide an overview of boiler and
networked boiler operation. The status screens
include “Load Profile” for Central Heat and
Domestic Demands. These profiles allow the
user to review the Run Hour (%) versus Load
(%). The “Load Profile” along with run hours and
cycles provides a complete picture of boiler
status.

OPERATION
The operation screens allow the user to take
manual or automatic control of the unit. These
screens are intended to allow a technician to set
firing rate to support combustion testing and
provide trending and parameter adjusting to
support fine tuning the boilers response to load
changes. Operation screens may be used to
speed up or slow down the boilers response to
fast or slow system load changes.

ARCHIVES
The Archives collect the history of how the boiler

has operated and provides tools to review and
improve system operation;

 A historical trend – Up to four (4) months of

data is collected and may be viewed on
screen or saved to a Thumb Drive.

 Lockout History – provides data on up to 15

manual reset Lockouts. Data collected
includes cause of boiler trip, run hour and
status when lockout occurred.

 Cycle & Run Time History – collects the

usual summary of cycles and hours of boiler
and pump operation. All cycles and run
hours other than the controller quantities may
be reset to aid in identifying improvements
made.

 Alarm History – limit string faults, holds,

lockouts and other alarms are recorded with
time and date stamp.

 Thumb Drive Operation – these screens

provide ability to save or load parameters as
well as alarm and trend data.

SENSORS
Status and details are provided on all sensors
connected to the Control.

EMS INTERFACE
EMS setup options and status is provided.

HELP
Active alarms and corrective actions are
provided.

QUICK SETUP
Commonly required parameters are presented
for quick review and adjustment.

ADJUST
Each adjustable parameter is presented for
adjustment. Proper login is required.

Page 14

of 68

Boiler Control Instruction & Operation

Manual

Front Panel
Status Screens

Boiler Status screens are the primary boiler monitoring screens. The user may simply “walk” through
boiler operation by repeatedly selecting the right or left “arrow” symbol . These screens are accessed by
selecting the “status” button from the “Home” or “Menu” screens.

Figure 11: Status Screen Navigation

Sequencer Status

This screen only appears when the Sequencer
Master is enabled. It shows data involved with the
network including active setpoint and sensor, the
network priority, and the setpoint source.
This status screen also displays all boilers in the
boiler to boiler network. For each boiler, the status
screen will tell it’s assigned boiler number, current
state, firing rate, and whether it is the current Lead
boiler.

Boiler Status
This screen gives an overview of the current status
of the boiler. The active setpoint and sensor which
the boiler is currently modulating based on are
displayed using a bar graph & numeric values.
Also displayed are all current sensors installed in
the boiler. These sensors will display red if there is
an issue with any of them.
Additional information shown on this page includes
current firing rate, boiler priority, current status, and
setpoint source.

Demand Status
This page gives the demand status of the Central
Heat, Domestic Hot Water, and Sequencer (Lead
Lag). Along with this status, the boiler run hours,
on/off status, and cycles are also shown.

Pump information is also included on this page
including on/off status and cycles. Frost Protection
status and Exercise will also appear when used.

Additionally, the Load Profiles are on this page,
which give historic data on the modulation of the
boiler. This graph shows the percent of the total run
hours the boiler spends modulating at each rate
(%).

Boiler Monitoring
This is an overview of all sensors installed on the
boiler represented as bar graphs. Numeric values
are also provided for accurate readings.

Page 15

of 68

Boiler Control Instruction & Operation

Manual

Front Panel
Status Screens

The status screen shows data relevant to current boiler operation. All installed sensors are shown on this
page as well as current modulation %, setpoint, active sensor, and much more. A detailed screen map is
shown below.

Figure 12: Status Screen Detail

Manual

Page 16

of 68

Boiler Control Instruction & Operation

Manual

Installation

Quick Setup

Factory

Setting

Range /
Choices

Parameter and Description

180

50 to 190 (ºF)

Central Heat Setpoint

10

3 to 29 (ºF)

Central Difference Above

5

3 to 29 (ºF)

Central Difference Below

180

50 to 190 (ºF)

Domestic Hot Water Setpoint

10

3 to 29 (ºF)

Domestic Difference Above

5

3 to 29 (ºF)

Domestic Difference Below

32

-50 to 50 (ºF)

CH Frost Protection Setpoint

70

20 to 100 (ºF)

Warm Weather Shutdown Setpoint

195

50 to 195 (ºF)

Stop All Boilers

Factory

Setting

Range /
Choices

Parameter and Description

30 (ºF)

-50 to 32 (ºF)

Minimum Outdoor Temperature

70 (ºF)

35 to 100 (ºF)

Maximum Outdoor Temperature

110 (ºF)

70 to 180 (ºF)

Low Water Temperature

130 (ºF)

50 to 185 (ºF)

Minimum Boiler Water Temperature

Factory

Setting

Range /
Choices

Parameter and Description

3

1 to 5

Central Heat Response Speed

0

0 to 30 Minutes

Central Heat Low Fire Hold Time

3

1 to 5

Domestic Heat Response Speed

0

0 to 30 Minutes

Domestic Heat Low Fire Hold Time

Factory

Setting

Range

/

Choices

Parameter and Description

Boiler Pump

Any Demand

Never

Any

Demand

CH, OFF DHW

Demand

Boiler Pump

System Pump

Any Demand

System Pump:

Never

System Pump: Any Demand System

Pump:

Central Heat, No Priority System

Pump:

Central Heat, Optional Priority Fresh

Air

Damper

Spare Output J4, 6-7

DHW

Pump Primary

Loop

Piped IWH

DHW Pump:

Never

DHW Pump: Primary Loop Piped

IWH

DHW Pump: Boiler Piped

IWH

Fresh Air

Damper

Spare Output J4, 6-7

The Quick Setup Menu is accessed from the Main Menu Screen. The Quick Setup menu allows the
user to review and adjust the most commonly adjusted parameters, such as Setpoints and pump output
settings, from one location. Refer to Parameter Adjustment section for additional information.

Setpoints

Comfort

Response

Hydronic System

Page 17

of 68

Boiler Control Instruction & Operation

Manual

Installation

Terminal

Layout

Figure 13: Control Terminal Layout and wiring notes

Page 18

of 68

Boiler Control Instruction & Operation Manual

Installation

Terminal

Layout

Figure 14: Display Terminal Layout and wiring

notes

Page 19 of 68

Boiler Control Instruction & Operation Manual

Installation

Boiler-To-Boiler Network

Step

Description

Comments

1

Install and wire

the

Header

Sensor

Wire a header sensor to Control J8 terminals 11 &12 of the Sequence Master
Enabled Boiler.

NOTE

This step cannot be skipped. The Sequence Master cannot be enabled unless a
Header Sensor is installed.

2

Install Ethernet Cables

between boilers

Use standard Ethernet type cables to make connection between boilers. When
more than two boilers are connected an RJ45 splitter may be used to connect the
boilers. Refer to Figure 15.

4

Set Unique

Boiler

Addresses

Assign all boilers a unique Boiler Address using any number from 1 through 8.
(Found in Main Menu > Adjust > Sequence Slave)

NOTE

When two boiler’s addresses are the same undesirable simultaneous operation
occurs.

5

Enable 1

Boiler

Master

Enable only one Control’s Sequencer Master. (Found in Main Menu > Adjust >

Sequence Master)

WARNING

When more than one Sequencer Master is enable erratic behavior will result.

9

Confirm

Communication

Power down all boilers and power up Sequence Master Enabled boiler first. From
the Sequence Master Enabled Control’s Home Screen “press” the Status button.
The Sequencer display shows the boiler address of the communicating boilers.

If a boiler is not shown, check Ethernet cable connections and confirm all boilers
have unique addresses.

The Boiler-To-Boiler Network allows the Control’s Internal Sequence Master to communicate boiler
information, including modulation rate and on/off commands, using a standard Ethernet cable.

FREE FLEX

RJ45 Connection

Inside Boiler

(typical)

Boiler 1

Sequence

Enabled Boiler

Master

Figure 15: Communication Network Connections

Table 6: Sequence Master Setup Procedure

FREE FLEX

FREE FLEX

Boiler 2 Boiler 3

Splitter

(when more than 2 boilers)

(Sold

Seperately)

PN: 109032-01

Ethernet

(Sold Seperately)

Connects to
Up to 8 boilers and
Energy
System

Cable

Management

Page 20 of 68

Boiler Control Instruction & Operation Manual

Installation

External Sensors

Header Sensor (P/N 101935-01 or 103104-01)
A header sensor must be installed and wired to the

Master Sequencer “enabled” Control. The header
sensor is installed on the common system piping
and provides blended temperature information to
the Sequence Master. Refer to boiler manual’s
piping diagram for installation location and Figure
15a or 15b for installation detail.

Figure 15a, Direct Immersion Type Header Sensor

Installation Detail

Figure 15b, Thermowell type Header Sensor

Installation Detail

Page 21 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Factory

Setting

Range /

Choices

Parameter and

Description

Local

Local,

4-20mA,

Modbus

Modulation Source
The boiler can modulate (vary boiler heat input) based on local or remote (4-20mA or
Modbus) signals. Modulation begins after the start sequence finishes and the boiler is
released to modulate. Modulation Source has the following selections:
Local Local setpoint and control is used to create firing rate.

4-20mA Input wired to J8 terminals 6 and 7 is used as modulation rate.
Modbus Modbus signal is used as modulation rate.

Local

Local,

4-20mA,

Modbus

Central Heat & Lead Lag Setpoint Source

The setpoint may be based on local (customer entered value or outdoor reset) or
remote (4-20mA or Modbus) signals. Setpoint Source has the following selections:
Local User entered CH Setpoint or Reset Curve provides the setpoint.

4-20mA Input wired to J8 terminals 6 and 7 is used as setpoint.
Modbus Modbus signal is used as setpoint.

Local

Local,

Modbus

CH Demand Switch
The Central Heat demand (Central Heat Enable/Disable) can be directly wired to the
Control or provide by the Modbus interface.
Local Central Heat demand is present when a contact closure is received

between J8 terminals 1 and 3 .

Modbus Modbus signal provides demand.

Local

Local,

Modbus

LL Demand Switch
The Lead Lag Master’s demand (Central Heat Enable/Disable) can be directly wired to
the Control or provide by the Modbus interface.
Local Lead Lag demand is present when a contact closure is received

between J8 terminals 1 and 3 .

Modbus Modbus signal provides demand.

130 F

50 – 185 F

Central Heat 4-20mAdc Setup, 4 mA Water Temperature
Sets the Central Heat Temperature Setpoint corresponding to 4 mA.

180 F

50 – 185 F

Central Heat 4-20mAdc Setup 20 mA Water Temperature
Sets the Central Heat Temperature Setpoint corresponding to 20mA.

1

Disable PWM to

4-20mA PWM

to

0-10V

LL Rate to 4-20mA

LL Rate to 0-10V

Analog Rate Tracking – allows external system to monitor firing rate.
Disable No signal is sent to terminals
PWM to 4-20mA Firing rate provided using 4-20mA signal
PWM to 0-10V Firing rate provided using 0-10V signal
LL Rate to 4-20mA Sequence Master demand is provided using 4-20mA signal
LL Rate to 0-10V Sequence Master demand is provided using 0-10V signal

The control system has a full featured ability to interface with an Energy Management System (EMS). The
control system allows remote control and monitoring via RS485 Modbus or through direct wiring.

Figure 16:
Remote
Demand
Setup
Screens

(From Display “Press” Menu > EMS Interface > Remote Demand to access)

Page 22 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Remote Demand Setup Screens Continued:

Factory

Setting

Range /
Choices

Parameter and Description

0.1

0 - 10

Analog Input Hysteresis
This parameter adjusts the amount of hysteresis applied remote control input when
modulation source is set to 4-20mA. A zero value disables this feature.

10

0 - 10

Analog output hysteresis
This parameter adjusts the amount of hysteresis applied to the PID output when a
non-PWM modulation is selected. The value determines how much the PID is
required to change in a new direction before the output will change. A zero value
disables this feature.

Step

Description

Comments

1

Install Ethernet

Cables between

boilers

Use standard Ethernet type cables to make connection between boilers.
When more than two boilers are connected an RJ45 splitter may be used
to connect the boilers. Refer to Figure 15.

NOTE

The same Ethernet cable that connects the Boiler-To-Boiler Sequence
Master also connects the EMS Modbus signals. Refer to Figure 14 for
detail.

2

Enable EMS

Communication

Communication must be enabled. Go to Modbus menu (Press Menu >
EMS Interface > Modbus Setup) and “Press” EMS Enable/Disable to
Enable.

3

Set Unique Modbus

Addresses “Comm

HMI Station”

The EMS Modbus address may be independent to the Boiler number or
boiler address. Go to Modbus menu (Press Menu > EMS Interface >
Modbus Setup) and select EMS Modbus Parameters. Follow on screen

instructions.

NOTE

Each boiler must have a unique Comm HMI Station address.

4

Adjust

Communication

Parameters

Communication Parameters are adjustable. Go to Modbus menu (Press
Menu > EMS Interface > Modbus Setup) and select EMS Modbus
Parameters. Follow on screen instructions.

NOTE

Baud Rate and Parity must match the EMS settings for communication to

be established.

9

Confirm

Communication

The display provides a list of all EMS signals. Go to Modbus menu (Press
Menu > EMS Interface) and select Points List. Use the list to verify signals
sent and received from the EMS.

Connecting a EMS Modbus Interface
Table 7: Energy Management System Interface Procedure

Page 23 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

The following Parameters are adjustable within the System menu of the display. Access System menu by

COM Port:

Com 1

Com 2

Com 3

Com Port Configure For

Not Used

Control

EMS

Port Type

Not Used

Modbus Master

Modbus Slave

Special Notes

n/a

Caution

Do not change any of

these settings. Loss of

communication to control

could result.

Note

This is the port to adjust

settings to suit the EMS

System

Comm HMI Station
This is Modbus Slave Address.

n/a

0

(not used)

1

COM Mode

n/a

RS 485

RS 485

Baud Rate

n/a

38400

38400

Stop Rate

n/a

1 bit

1 bit

Data Bits

n/a

8 bit

8 bit

Parity

n/a

None

None

Comm Delay

n/a

10 ms

10 ms

Comm Timeout

n/a

1000 ms

1000 ms

Comm Retry Times

n/a

2

2

PLC Default Station
This is address Modbus Master is reading.

n/a

1

1

(not used)

Baud Rate Fine Tuning

n/a

0

0

going to the Main Menu > EMS Interface > Modbus Setup. Select EMS Modbus Parameters for directions
on how to edit EMS Parameters. READ ALL DIRECTIONS before entering the System Menu.

Display Communication Port Setup;

Page 24 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Table 8: Modbus Signal List

Modbus

Register

Protocol

Name

Description

Read (R)/
Write (W)

Enable / Disable

577

Central Heat
Enable/Disable

Central Heat Enable/Disable
0 = Disable
1 = Enable
When this register is not written every “Modbus
Command Time Out” parameter seconds (default 30
seconds), CH Modbus Stat is reverted to 0, no
demand.

W

563

LLCH Modbus Stat

LL CH Modbus STAT
0 = no demand
1 = demand
When this register is not written every “Modbus
Command Time Out” parameter seconds (default 30
seconds), CH Modbus Stat is reverted to 0, no
demand.

W

203

Burner on/off

Burner On/Off burner.
1 = on
0 = off

R

6

Demand source

0 = Unknown
1 = No source demand
2 = Central heat
3 = Domestic hot water
4 = Lead Lag slave
5 = Lead Lag master
6 = Central heat frost protection
7 = Domestic hot water frost protection
8 = No demand due to burner switch turned off
9 = Domestic hot water storage
11 = Warm weather shutdown

R

66

CH heat demand

0=Off,
1=On

R

83

DHW heat demand

0=Off,
1=On

R

123

Low Temperature
Loop heat demand

0=Off,
1=On

R

Setpoints

10,579

CH Modbus
Setpoint

Use this register to change the boiler setpoint.
When this register is not written every “Modbus
Command Time Out” parameter seconds (default 30
seconds), setpoint reverts to local setpoint

valid range 60 F to 190 F

W

10,562

CH Sequencer
Modbus Setpoint

Use this register to change the multiple boiler
Sequencer setpoint.
When this register is not written every “Modbus
Command Time Out” parameter seconds (default 30
seconds), setpoint reverts to local setpoint

valid range 60 F to 190 F

W

The following is the list of available Modbus signals;
Register addresses start at 0 (zero) based on the Modbus-IDA protocol specification. For more traditional
addressing scheme (starting at 40001) a value of 40001 should be added to the decimal address for each
register.

Page 25 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Table 8: Modbus Signal List (continued)

Modbus

Register

Protocol
Name

Description

Read (R)/
Write (W)

10,211

CH setpoint

Status of local setpoint

R

10,453

DHW setpoint

Status of local setpoint

R

10,546

Lead Lag setpoint

Status of local setpoint

R

10,212

CH TOD setpoint

Status of local setpoint

R

10,065

CH setpoint source

0=Unknown,
1=Normal setpoint,
2=TOD setpoint,
3=Outdoor reset,
4=Remote control (4-20mA ),
7=Outdoor reset time of day

R

10,016

Active CH setpoint

-40 F (-40°C) to 266 F (130°C)
Setpoint determined by CH setpoint source (register

65).

R

10,081

DHW setpoint
source

0=Unknown,
1=Normal setpoint,
2=TOD setpoint,
5=DHW tap setpoint,
6=DHW preheat setpoint

R

10,017

Active DHW
setpoint

-40 F (-40°C) to 266 F (130°C) Setpoint determined by
DHW setpoint source (register 81).

R

10,162

Lead Lag master
setpoint source

0=Unknown,
1=CH setpoint,
2=CH TOD setpoint,
3=Outdoor reset,
4=Remote control (4-20mA ),
5=DHW setpoint,
6=DHW TOD setpoint,
7=Outdoor reset time of day,
8=Mix setpoint

R

10,018

Active LL setpoint

-40 F (-40°C) to 266 F (130°C)
Setpoint determined by LL setpoint source (register

162).

R

10,643

Low Temperature
setpoint

Setpoint entered on the local user interface.
valid range 79 F (26.1 C) to 191 F (88.3 C)

R

10,121

Low Temperature
setpoint source

0=Unknown,
1=Normal setpoint,
2=TOD setpoint,
3=Outdoor reset,
4=Remote control,
7=Outdoor reset time of day,
9=Outdoor boost

R

10,024

Active Low
Temperature
setpoint

-40 F (-40°C) to 266 F (130°C) Setpoint determined by
Low Temp setpoint source (register 121).

R

Temperature Sensors

10,007

Supply sensor

-40 F (-40°C) to 266 F (130°C)

R

10,011

Return sensor

-40 F (-40°C) to 266 F (130°C)

R

10,013

Header sensor

-40 F (-40°C) to 266 F (130°C)

R

10,014

Stack sensor

-40 F (-40°C) to 266 F (130°C)

R

10,170

Outdoor sensor

-40 F (-40°C) to 266 F (130°C)

R

15

4 - 20 mA remote
control input

mA value for S2 (J8-6) parameter selectable as
(remote set point) & (remote modulation)

R

Page 26 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Table 8: Modbus Signal List (continued)

Modbus

Register

Protocol
Name

Description

Read (R)/
Write (W)

10,817

Outdoor
Temperature

Building Automation may send the controller the
outdoor air temperature. Use this register to

change

the

outdoor temperature. When this register is not
written every “Modbus Command Time Out” parameter
seconds (default 30 seconds), temperature is set to
bad data quality and outdoor air reset is set back to
local setpoint.

valid range -40 F to 302 F

W

Burner

581

CH Modbus Rate

Use this register to drive individual boiler firing rates.
This register is used when firing rate control is
performed by an external building automation system.
Firing rate reverts to local control when register is not
written every “Modbus Command Time Out” parameter
seconds (default 30 seconds),

Range is 0 to 200 % provides 0-100% firing rate.

W

8

Fan Speed
Measured

Speed of the combustion air blower in rpm

R

9

Fan Speed
Commanded

Speed of the combustion air blower in rpm

R

10

Flame signal

0.01V or 0.01μA precision (0.00-50.00V)

R

33

Burner control state

0 Initiate
1 Standby Delay
2 Standby
3 Safe Startup
4 Prepurge - Drive to Purge Rate
5 Prepurge – Measured Purge Time
6 Prepurge – Drive to Lightoff Rate
7 Preignition Test
8 Preignition Time
9 Pilot Flame Establishing Period
10 Main Flame Establishing Period
11 Direct Burner Ignition
12 Run
13 Postpurge
14 Lockout

R

Page 27 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Table 8: Modbus Signal List (continued)

Modbus

Register

Protocol
Name

Description

Read (R)/
Write (W)

Trouble Shooting

10,034

Lockout code

Reasons for burner lockout
0 No lockout,
4 Supply high limit
5 DHW high limit
6 Stack High limit
12 Flame detected out of sequence
18 Lightoff rate proving failed
19 Purge rate proving failed
20 Invalid Safety Parameters
21 Invalid Modulation Parameter
22 Safety data verification needed
23 24VAC voltage low/high
24 Fuel Valve Error
25 Hardware Fault
26 Internal Fault
27 Ignition Failure

R

10,040

Hold code

Reason for burner hold
0 None
1 Anti short cycle
2 Boiler Safety Limit Open
3 Boiler Safety Limit Open, (ILK Off)
7 Return sensor fault
8 Supply sensor fault
9 DHW sensor fault
10 Stack sensor fault
11 Ignition failure
13 Flame rod shorted to ground
14 Delta T inlet/outlet high
15 Return temp higher than supply
16 Supply temp has risen too quickly
17 Fan speed not proved
23 24VAC voltage low/high
25 Hardware Fault
27 Ignition Failure

R

Statistics

763

Modbus command
timeout

This parameter sets the amount of time the control will
wait for input from the Building Automation System
(BAS). If the BAS does not write to the following
register within the “Modbus Command timeout”
seconds the following inputs are considered invalid:

CH Modbus Stat,
CH Modbus Setpoint,
CH Sequencer Modbus Setpoint
CH Modbus Rate

range 30 – 120, Default 30 seconds
Other R/W registers should only be written when a

value is needed to be changed. Only the above listed
registers are stored in non-volatile registers.

R/W

Page 28 of 68

Boiler Control Instruction & Operation Manual

Installation

Energy Management Interface

Table 8: Modbus Signal List (continued)

Status

Description

110

On from local Mix demand

111

On from Lead Lag Mix demand

112

On from local Central Heat service

113

On from Lead Lag Central Heat service

114

On from local DHW service

115

On from Lead Lag DHW service

116

On from local Mix service

117

On from Lead Lag Mix service

118

On from Lead Lag auxiliary pump X

119

On from Lead Lag auxiliary pump Y

120

On from Lead Lag auxiliary pump Z

121

On, but inhibited by pump start delay

122

On from pump override

123

Off, not needed

124

On from burner demand

125

On from exercise

126

On from local Lead Lag service

127

On from local Lead Lag pump demand

Modbus

Register

Protocol
Name

Description

Read (R)/
Write (W)

Pump Status

96

CH pump status

See Table 9

R

100

DHW pump status

See Table 9

R

108

Boiler pump status

See Table 9

R

128-

129

Burner cycle count

0-999,999 (U32)

R/W

130-

131

Burner run time

Hours (U32)

R/W

132-

133

System pump cycle
count

0-999,999 (U32)

R/W

134-

135

DHW pump cycle
count

0-999,999 (U32)

R/W

400,138-

400,139

Boiler pump cycle
count

0-999,999 (U32)

R/W

Status

Description

92

Forced On from manual pump control

93

Forced On due to Outlet high limit is active

94

Forced On from burner demand

95

Forced On due to Lead Lag slave has
demand

96

Forced Off from local DHW priority service

97

Forced Off from Lead Lag DHW priority
service

98

Forced Off from Central Heat anti­condensation

99

Forced Off from DHW anti-condensation

100

Forced Off due to DHW high limit is active

101

Forced Off from EnviraCOM DHW priority
service

102

On due to local CH frost protection is active

103

On due to Lead Lag CH frost protection is
active

104

On due to local DHW frost protection is
active

105

On due to Lead Lag DHW frost protection
is active

106

On from local Central Heat demand

107

On from Lead Lag Central Heat demand

108

On from local DHW demand

109

On from Lead Lag DHW demand

Table 9: Pump Status Codes

Page 29 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning

Manual Operation

The Firing rate may be adjusted manually using the Operation screen. The user may select Low or High
speeds, or adjust firing rate anywhere between low and high;

Figure 17: Operating Screens

Bar Graph & Trend

Active Sensor, Active Setpoint & Modulation

Auto/Manual
After selecting Manual Mode the User may adjust

modulation manually. Menu also allows for switching of
units from % (default) to RPM.

Rate
Select Manual modulation to enable user adjustment of

firing rate. The factory default is Automatic mode.

High/Low
After selecting Manual Mode the High or Low buttons

drives firing rate to High and Low fire position for
combustion testing.

Service Trend
Service Trend screen shows; boiler temps, firing rate &

demand statuses.

Tune
Tune screen allows for adjustment of parameters related

to the rate of boiler response. This includes PID
settings, Ramp rates and more. For more details on
the Tune Screen see Tune Screen in Adjustable
Parameters Section.

Manual Pump Exercise
Allows the pumps to be set to either ON or Automatic.

When ON is selected pump will run. When Automatic is
selected, pump will follow settings assigned in Pump
Adjust Menu.

Manual control mode locks firing rate to a fixed speed. The control stays in manual even through a power
cycle. Select Automatic when commissioning is complete.

NOTE:

Page 30 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Login to Adjust Parameters
Control operation may be tailored to suit the
application by adjusting parameters. To adjust
parameters select the ADJUST icon located
throughout the display.

Press ADJUST icon to review and

adjust all

Parameters are password protected to discourage
unauthorized or accidental changes to settings.
User login is required to adjust these settings.
Parameters are locked and login requirement is
shown when the padlock icon is not green

 Press the Lock icon to access password screen.
 Use keypad to enter Password.
 Press Enter Key when complete.

Adjusting Parameters
Editing parameters is accomplished as follows:

parameters.

Figure 18: Security System

Figure 19: Adjusting Parameters

Page 31 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

System

Factory

Setting

Range /

Choices

Parameter and

Description

Fahrenheit

Fahrenheit

Celsius

Temperature Units
The Temperature Units parameter determines whether temperature is represented in

units of Fahrenheit or Celsius degrees.

Not Installed

Not

Installed,

Wired,
Modbus,
Wireless

Outdoor Sensor Source
Not Installed Outdoor Sensor is not connected to the boiler, the sensor is not

monitored for faults.

Wired Outdoor Sensor thermistor is installed directly on the boiler terminal

strip.

Modbus Outdoor temperature is retrieved through the Modbus connection from

another boiler or Energy Management System.

Wireless Wireless outdoor sensor is installed. Honeywell Wireless Outdoor Air

Reset Adaptor part number 105766-01 is a wireless outdoor air sensor.
The package includes a Wireless Receiver Module and Wireless
Outdoor Sensor. The sensor communicates wirelessly to the receiver
module. The receiver module is wired to the Control EnviraCOM
terminals. Refer to wiring section for more information.

0 degrees

-50 to 50
degrees

Outdoor Sensor Calibration
Outdoor sensor calibration allows a single point adjustment of the outdoor sensor

reading. This adjustment is a correction offset added to or subtracted from the outdoor
temperature sensor reading. It is recommended to make any calibration when outdoor
air temperature is at or near the most common operating point. For example, when
necessary, calibrate the sensor when outdoor air is halfway between Minimum and a
Maximum Outdoor Temperature parameter value is recommended.

1 Min

0 to 20 Min

Anti-Short Cycle Time
Anti-short cycle is a tool that helps prevent excessive cycling resulting from a fast
cycling enable-disable input (STAT terminal). It provides a minimum delay time before
the next burner cycle. DHW demand is serviced immediately, without any delay.

Enabled

Enable/Disable

CH Frost Protection
Disable Frost Protection is not used.
Enable Boiler and system circulators start and boiler fires when low outside air,

supply and return temperatures are sensed as follows:

32 (ºF)

-50 to 50 (ºF)

CH Frost Protection Setpoint
Outdoor Temperature at which pumps are started for frost protection.

From the ADJUST menu select the following buttons to view and adjust parameters.

Device

Start

Temperatures

Stop Temperatures

Boiler Pump

System Pump

Outside Air < 32°F

Supply Water < 45°F

Outside Air > 36°F

Supply Water > 50°F

Boiler

Supply Water < 38°F

Supply Water > 50°F

Press to adjust the following parameters.

Page 32 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

System Menu Continued

Factory

Setting

Range /
Choices

Parameter

and Description

76

9 Character

Maximum

Supervisor

Password

Allows for custom password to be set. Must be 9 characters or less. Only allows
adjustment of supervisor password (supervisor default: 76). Cannot change Factory
password.

 Must enter current installer password.
 Must enter new password and press enter.
 Must re-enter new password and press enter.

NOTE:

Can be reset to supervisor default 76 if accessed with the Factory level password (86).

Disabled

Enable/Disable

Warm Weather Shutdown Enable

Disable Warm Weather Shutd own (WWSD) is not used.

Enable A central heat boiler start is prevented if the outside temperature is

greater than the WWSD setpoint. WWSD is initiated as soon as outside
air temperature is above WWSD Setpoint. The control does not require
call for heat to be satisfied before entering WWSD.
The boiler will still start in response to a Domestic Hot Water call for heat.

70°F

20 to100 (ºF)

Warm Weather Shutdown Setpoint
The Warm Weather Shutdown (WWSD) Setpoint used to shutdown the boiler when
enabled by the “WWSD Enable” parameter.

xx/xx/xxxx NA

System Date
Date used by display Alarm

History

screen. A battery is

provided

to maintain the system date

and time while the display is

powered

down.

xx:xx:xx NA

System Time
Time used by display Alarm

History

screen. A battery is provided to

maintain

the system date

and time while the display is

powered

down.

Enabled

Enable/Disable

Auto Jump to Home Page

Enable After 15 minutes of no use, the display will

automatically

return to the Home

Page.

Disable

Display

will not change screens to Home Page after 15 minutes.

Page 33 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

WARNING

Factory

Setting

Range /

Choices

Parameter and

Description

Model dependent

See

Table 10

Boiler Model

Boiler Size Setup
To verify the boiler size selection, a qualified technician should do the following:

1. Check boiler’s label for actual boiler size.

2. Set “Boiler Model” to match actual boiler size.

3. Select “Confirm”.
The Boiler Model parameter changes multiple boiler type related parameter settings.
This parameter is intended to allow a user to set the parameters in a spare part Control
to a particular boiler model.

Save Modulation Settings
This function stores the current modulation settings for future spare part setup
operation.

See

Table 10

Minimum

to

Maximum

Modulation

Central Heat Max Modulation Speed
This parameter defines the highest modulation rate the Control will go to during a
central heat call for heat. If the rated input of the installed radiation is less than the
maximum output of the boiler, change the Central Heat Maximum Modulation (fan
speed) setting to limit the boiler output accordingly.

100%

Minimum

to

Maximum

Modulation”

Domestic Hot Water (DHW) Max Modulation Speed
This parameter defines the highest modulation rate the Control will go to during a
Domestic Hot Water call for heat. If the rated input of the indirect water heater is less
than the maximum output of the boiler, change the DHW Maximum Modulation (fan
speed) setting to limit the boiler output accordingly.

See

Table 10

Minimum

+ 100

to

Maximum

-

100

Minimum Modulation Speed
This parameter is the lowest modulation rate the Control will go to during any call for
heat.

See

Table 10

minimum to

1300rpm

Lightoff Rate
This is the blower speed during ignition and flame stabilization periods.

Control Repair Part

Boiler

Model

Boiler

Model

Max Power KBTU

1000

1500

2000

2500

3000

CH Maximum Modulation Rate (RPM)

5650

4500

4000

4100

4300

Minimum Modulation Rate (RPM)

1200

1100

1000

1000

1000

Light-off Rate (RPM)

1300

1200

1100

1200

1200

PWM Frequency

3 2 2 2 2

Asphyxiation Hazard. Boiler type is factory set and must match the boiler model. Only change the boiler type
setting if you are installing a new or replacement Control. The boiler type setting determines minimum and
maximum blower speeds. Incorrect boiler type can cause ha zardous burner conditions and improper operation that
may result in PROPERTY LOSS, PHYSICAL INJURY OR DEATH.

Modulation Menu

Table 10: Example Parameters Changed by Boiler Model Selection:

FF-1000 FF-1500 FF-2000 FF-2500 FF-3000

NOTE: Maximum Modulation Rates are designed for 100% nameplate rate at 0°F (-18°C) combustion air.
Contact factory before attempting to increase the Maximum Modulation Rate

Page 34 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Pumps

Factory

Setting

Range /

Choices

Parameter and

Description

System

Pump:

Any

Demand

System Pump:

- Never,

- Any Demand,

- Central Heat No
Priority,

- Central Heat,
Optional Priority

- DHW Pump

Contact A: System Pump
Activates the system pump output according to selected function.

Never: Pump is disabled and not shown on status screen.
Any Demand: Pump Runs during any call for heat.
Central Heat, No Priority: Pump Runs during central heat and frost

protection call for heat. Pump does not start for a
DHW call for heat and continues to run during
Domestic Hot Water Priority.

Central heat, Optional
Priority: Pump Runs during central heat and frost protection

call for heat. Pump does not start for a DHW call
for heat and will be forced off if there is a DHW call
for heat and Domestic Hot Water Priority is active.

DHW Pump: Pump Runs during domestic hot water call for heat. Domestic

Hot Water Priority enable/disable does not affect pump
operation.

Any

Demand

Never

Any

Demand

Contact C: Boiler Pump
Activates the Boiler Pump, Combustion Air Damper and/or Standby Loss Damper

output according to selected function:
Never: Output is disabled and not shown on status screen

Any Demand: Output activated for any burner demand.

DHW

Pump:

Primary

Loop

Piped

(IWH)

Isolation Valve:

- Never,

- Isolation Valve

- DHW Pump

Contact B: Isolation Valve
Activates the Isolation Valve or Domestic pump output according to selected

function.
Never: Pump is disabled and not shown on status screen.
Isolation Valve: Output activated for any burner demand or when boiler is lead

boiler.

DHW Pump: Pump Runs during domestic hot water call for heat. Domestic

Hot Water Priority enable/disable does not affect pump
operation.

Press to adjust the following parameters.

Page 35 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Pumps

Factory

Setting

Range /

Choices

Parameter and Description

0 Min

0 to 60 Min

Overrun Time: System Pump
Time that pump runs after demand is satisfied. Used to dissipate heat within the
system.

0 Min

0 to 60 Min

Overrun Time: Isolation Valve
Time that pump runs after demand is satisfied. Used to dissipate heat within the
system.

1 Min

10 seconds to 60 Min

Overrun Time: Boiler Pump (Combustion Air Damper and Standby Loss
Damper)

Time that pump runs after demand is satisfied. Used to dissipate heat within the
system.

7 Days

0 to 40 Days

Pump

Exercise

Interval

The number of days the pump is inactive before the pump will be activated for
the Pump Exercise Time.

20 Sec

0 to 10 Min

Pump

Exercise

Time

The amount of time the pump runs for exercise. This feature helps prevent pump
seizing due to inactivity periods.

Press to adjust the following parameters.

Page 36 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Press

Factory

Setting

Parameter and Description

Enter name
Enter address line 1
Enter address line 2
Enter phone number
Enter email

Contractor
Select the line of information to edit. Use key pad to
input data and press ENT to enter data into Contractor
Info.

Enter name
Enter address line 1
Enter address line 2
Enter phone number
Enter email

Service Company

Select the line of information to edit. Use key pad to
input data and press ENT to enter data into Service
Company Info.

Enter name
Enter address line 1
Enter address line 2
Enter phone number
Enter email

Sales Representative

Select the line of information to edit. Use key pad to
input data and press ENT to enter data into Sales
Representative Info.

Service Contacts

to adjust the following parameters.

This information may be entered from a USB thumb drive or from the screen. Refer to Using Archives
section for thumb drive instructions.

Page 37 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Central Heat

Factory

Setting

Range /

Choices

Parameter and

Description

180

50 to 190 (ºF)

Central Heat Setpoint
Target temperature for the central heat priority. Value also used by the outdoor air reset
function.

170 (ºF)

50 to 190 (ºF)

Central Heat Time of Day (TOD) Setback Setpoint
The TOD setpoint is used when a time of day timer relay is wired to the Time Of Day
Controller Input. When setback is “on” the time of day setback setpoint shifts the reset
curve to save energy while building is in a reduced room temperature mode. The reset
curve is shifted by the difference between the High Boiler Water Temperature and the
TOD Setback Setpoint. Any time of day timer may be used to provide the input to the
control TOD input. When connected, it allows boiler water setback cost savings.

10 (ºF)

3 to 29 (ºF)

Central Heat Difference Above
The boiler stops when the water temperature rises ‘Difference Above’ degrees above

the setpoint.

5 (ºF)

3 to 29 (ºF)

Central Heat Heat Diff Below
The boiler starts when the water temperature drops ‘Difference Below’ degrees below
the setpoint.

3 1 to 5

Central Heat Response Speed
This parameter adjusts the Central Heat temperature controller Proportion Integral

Derivative (PID) values. Higher values cause a larger firing rate change for each
degree of temperature change. If set too high firing rate “overshoots” required value,
increases to high fire causing the temperature to exceed the “Difference

Above”

setpoint

and cycle the boiler unnecessarily. Lower values cause a smaller firing rate
change for each degree of temperature change. If set too low, the firing rate response
will be sluggish and temperature will wander away from setpoint. Refer to Table 11 for
PID values used by these selections.

Table 11: Response Speed Adjustment Guidelines

Press to adjust the following parameters.

Page 38 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Domestic Hot

Water

Factory

Setting

Range /

Choices

Parameter and

Description

0 Min

0 to 90 Min

Domestic Hot Water Priority Time
When Priority Time is greater than zero and Domestic Hot Water (DHW) heat demand
is “on” the DHW demand will take “Priority” over space heating demand. When the
System and Boiler pumps are configured as “Central Heat (off DHW priority)” or
“Central Heat, Optional Priority” then they will be forced “off” during Priority Time.
Priority Time provides “Priority Protection” time for the event of a failed or excessive
long DHW demand. “Priority Time” is the time that the priority of the boiler will shift
away from Central Heat to satisfy a Domestic Hot Water call for heat.

180

50 to 190 (ºF)

Domestic Hot Water Setpoint
The Domestic Hot Water (DHW) Setpoint parameter is used to create a boiler water
temperature setpoint that is used when DHW heat demand is “on”. When the DHW
heat demand is not “on” (the contact is open or not wired) this setpoint is ignored

170 (ºF)

50 to 190 (ºF)

Domestic Hot Water Time of Day (TOD) Setback Setpoint
The TOD setpoint is used when a time of day timer relay is wired to the Time Of Day
Controller Input. When setback is “on” the time of day setback setpoint shifts the DHW
setpoint to lower the DHW temperature and to save energy while building is in a
reduced room temperature mode.

10 (ºF)

3 to 29 (ºF)

Domestic Hot Water Difference Above
The boiler stops when the water temperature rises ‘Difference Above’ degrees above
the setpoint.

5 (ºF)

3 to 29 (ºF)

Domestic Hot Water Diff Below
The boiler starts when the water temperature drops ‘Difference Below’ degrees below
the setpoint.

Factory

Setting

Range /

Choices

Parameter and Description

Outlet

Sensor

Outlet Sensor

Header
Sensor

Central Heat Modulation Sensor
Heat Demand may respond to the boiler’s Supply Temperature or Header
Temperature sensors. When Header Sensor is selected the boiler is fired in response
to the sensor wired to Header Sensor terminal J8 terminals 11 and 12.

NOTE: Outdoor air sensor cannot be selected to use the same terminal.

0 Min

0 to 30 Min

Central Heat Low Fire Hold Time

“Low Fire Hold Time” is the number of seconds the control will wait at low fire
modulation rate before being released to modulate. After ignition and flame
stabilization periods the firing rate is held at low fire for “Low Fire Hold Time”. This
delay allows heat to travel out to the system and provide system feedback prior to the
control modulating firing rate.

1200 RPM

1200 to

1300

RPM

Central Heat Low Fire Hold Rate

“Low Fire Hold Rate” is the modulation rate the boiler will fire at for the duration of the
“Low Fire Hold Time” before being released to modulate. After ignition and flame

stabilization periods the firing rate is held at “Low Fire Hold Rate” for “Low Fire Hold
Time”. This delay allows heat to travel out to the system and provide system feedback
prior to the control modulating firing rate.

Press to adjust the following parameters.

Page 39 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Factory

Setting

Range /
Choices

Parameter and Description

3 1 to 5

Domestic Hot Water Response Speed
This parameter adjusts the Domestic Hot Water temperature controller Proportion
Integral Derivative (PID) values. Higher values cause a larger firing rate change for
each degree of temperature change. If set too high firing rate “overshoots”
required value, increases to high fire causing the temperature to exceed the
“Difference Above” setpoint and cycle the boiler unnecessarily. Lower

values

cause

a smaller firing rate change for each degree of temperature change. If set
too low, the firing rate response will be sluggish and temperature will wander away
from setpoint. Refer to Table 11 for PID values used by these selections.

0 Min

0 to 30 Min

Domestic Hot Water Low Fire Hold Time
“Low Fire Hold Time” is the number of minutes the control will wait at low fire
modulation rate before being released to modulate. After ignition and flame
stabilization periods the firing rate is held at low fire for “Low Fire Hold Time”. This
delay allows heat to travel out to the system and provide system feedback prior to
the control modulating firing rate.

1200 RPM

1200 to

1300

RPM

Domestic Hot Water Low Fire Hold Rate
“Low Fire Hold Rate” is the modulation rate the boiler will fire at for the duration of
the “Low Fire Hold Time” before being released to modulate. After ignition and
flame stabilization periods the firing rate is held at “Low Fire Hold Rate” for “Low
Fire Hold Time”. This delay allows heat to travel out to the system and provide
system feedback prior to the control modulating firing rate.

Demand:

DHW Switch

Modulation:

Outlet
Sensor

Demand:

DHW Switch

Modulation:

Outlet Sensor

Demand:

DHW Sensor

Modulation:

DHW Sensor

Domestic Hot Water Demand/Modulation
Domestic Hot Water Demand may respond to the boiler’s DHW Switch or DHW
Sensor.

When “DHW Switch/Outlet Sensor” is selected the boiler responds to a domestic
hot water demand when a DHW Switch is sensed at J9 terminal 1 & 2 and is fired
in response to the Outlet Sensor.

When “DHW Sensor/DHW Sensor” is selected the boiler responds to a domestic
hot water demand when the DHW Sensor, temperature measured at J9 terminal 1
& 2 is below the “DHW Setpoint” less “Difference Below” and is fired in response to
the DHW Sensor.

Press

Outdoor Reset

to adjust the following parameters.

Figure 20:

Reset Curve

Page 40 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Factory

Setting

Range /

Choices

Parameter and

Description

Disabled

Enable

Disable

Outdoor Reset Enable
If an outdoor sensor is installed and Outdoor Reset is Enabled, the boiler will
automatically adjust the heating set point temperature based on the outdoor reset
curve in (see Figure 20). The maximum set point is defined by the Central Heat
Setpoint (default 180 F) when the outdoor temperature is Min Outdoor Temp (default
32 F) or below. The minimum set point temperature shown is 130°F when the outdoor
temperature is 50°F or above. As the outdoor temperature falls the supply water target
temperature increases.
Disable Do Not Calculate setpoint based on outdoor temperature
Enable Calculate the temperature setpoint based on outdoor temperature

using a reset curve defined by Low Outdoor Temp, High Outdoor
Temp, Low Boiler Water Temp, Min Boiler Temp and Central Heat
Setpoint and Boost Time parameters.

30 (ºF)

-50 to 32 (ºF)

Minimum Outdoor Temperature
The Low Outdoor Temperature parameter is also called “Outdoor Design
Temperature”. This parameter is the outdoor temperature used in the heat loss
calculation. It is typically set to the coldest outdoor temperature.

70 (ºF)

35 to 100 (ºF)

Maximum Outdoor Temperature
The High Outdoor Temperature parameter is the outdoor temperature at which the
Low Boiler Water Temperature is supplied. This parameter is typically set to the
desired building temperature.

110 (ºF)

70 to 180

(ºF)

Low Water Temperature
The Low Boiler Water Temperature parameter is the operating setpoint when the High
Outdoor Temperature is measured. If the occupied space feels cool during warm
outdoor conditions, the Low Boiler Water Temperature parameter should be increased.

130 (ºF)

50 to 185

(ºF)

Minimum Boiler Water Temperature
The Minimum Boiler Temperature parameter sets a low limit for the Reset setpoint.
Set this parameter to the lowest supply water temperature that will provide enough
heat for the type radiation used to function properly. Always consider the type of
radiation when adjusting this parameter.

0 Min

0 to 30 Min

Boost Time
When the Central Heat Setpoint is decreased by Outdoor Reset settings, the Boost
Time parameter is used to increase the operating setpoint when the space heat
demand is not satisfied after the Boost Time setting is exceeded. When heat demand
has been “on” continuously for longer than the Boost Time parameter the operating
setpoint is increased by 10°F (5.6°C). The highest operating setpoint from Boost Time
is current Central Heat Setpoint minus the Central Heat “Diff Above” setting. A setting
of 0 seconds disables this feature.

187 (ºF)

50 to 190

(ºF)

Central Heat Outdoor Air Maximum Off Point
Maximum value the setpoint can reach due to boost function. Should be set to match
Central Heat Setpoint.

187 (ºF)

50 to 190

(ºF)

Lead Lag Outdoor Air Maximum Off Point
Maximum value the setpoint can reach due to boost function. Should be set to match
Central Heat Setpoint.

Page 41 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Master

Sequencer

Factory

Setting

Range /

Choices

Parameter and

Description

Disabled

Enable

Disable

Master Enable/Disable
The Sequencer Master Enable/Disable is used to “turn on” the Multiple Boiler Lead­Lag Control.

WARNING:

Enable ONLY one Sequence Master in the boiler to boiler

network.

Boiler
Piped

Boiler Piped

Primary Piped

Indirect Water Heater (IWH)
Boiler Piped Sequencer to respond to an Isolated DHW demand that is piped

to a single boiler. The individual boiler goes on “Leave” from the
Sequencer Master and goes to DHW Service.

Primary Piped The Sequence Master responds to the DHW Call For Heat. This

allows one or more boilers to provide heat to the IWH.

Disabled

Enable

Disable

DHW Two Boiler Start
The Sequencer to immediately start two boilers for a DHW call for heat. Used when
DHW is the largest demand. Only relevant when “Primary Piped IWH” is selected.

3 Min

0.5 to 20 Min

Boiler Start Delay
Slave boiler time delay after header temperature has dropped below the setpoint
minus “Difference below”. Longer time delay will prevent nuisance starts due to short
temperature swings.

1 Min

0.5 to 5 Min

Boiler Stop Delay
Slave boiler time delay after header temperature has risen above the setpoint plus
“Difference Above” setpoint. Longer time delay will prevent nuisance stops due to
short temperature swings.

195 (ºF)

50 to 195 (ºF)

Stop All Boilers Setpoint
When this temperature is reached all Networked boilers are stopped at once without
any stop boiler time delays. This setpoint allows the Sequencer to respond to rapid
load increases.

40%

25 to 100 %

Base Load Common Rate
To maximize condensing boiler efficiency, the firing rate is limited to an adjustable
value. Boilers are kept at or below this firing rate as long as the boilers can handle the
load. After last available boiler has started, the modulation rate limit is released up to
100%.

24 Hours

8 to 48 Hours

Lead Rotation Time
Time boilers will act as the lead before switching the lead to another boiler in the boiler
to boiler network.

3 1 to 5

Response Speed
This parameter adjusts the Central Heat temperature controller Proportion Integral
Derivative (PID) values. Higher values cause a larger firing rate change for each
degree of temperature change. If set too high firing rate “overshoots” required value,
increases to high fire causing the temperature to exceed the “Difference Above”
setpoint and cycle the boiler unnecessarily. Lower values cause a smaller firing rate
change for each degree of temperature change. If set too low, the firing rate response
will be sluggish and temperature will wander away from setpoint. Refer to Table 11
for PID values used by these selections.

Press to adjust the following parameters.

Page 42 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning
Parameter Adjustment

Slave

Sequencer

Factory

Setting

Range /

Choices

Parameter and Description

None

1 to 8

Boiler Address
Each boiler must be given a unique address. When “Normal” slave selection order is used, the
boiler address is used by the Sequence Master as the boiler start order.

Normal

First

Normal

Last

Slave Selection Order

“Use Boiler First”; Places the Slave in the lead permanently.
”Use Boiler Last”; Places the slave last in the firing order.

Limits

Factory

Setting

Range /
Choices

Parameter and

Description

20 (ºF)

(Stepped

Modulation

Recycle

Offset

+

6)

to

30

Stepped Modulation Start Offset
Stepped Modulation is provided to help the boiler continue to supply heat when

temperatures are beginning to approach Limits. This feature helps avoid manual reset
and soft lockouts by reducing the firing rate when the temperature is “Stepped
Modulation Start Offset” degrees below the Limit setting. For example, when the
setting is 20 F the maximum modulation rate will begin to be reduced when stack
temperature is 20 F below the Stack Limit and will be at minimum modulation when
stack temperature is 10 F below the limit.

Supply Temperature (High Limit 210 F)(see Note below),
Differential Temperature (Differential Temperature Limit 100 F),
Stack Temperature (Stack Limit 230 F),

Note: This feature is not active for Supply temperature when it is the modulation
sensor. For example, this feature is active when Header Sensor is selected as
modulation sensor, when a boiler is a slave, when a boiler is responding to a remote
modulation demand (4-20mAdc or Modbus).

10 (ºF)

10

to

(Stepped

Modulation

Start Offset –

6)

Stepped Modulation Recycle Offset

This feature helps avoid manual reset and soft lockouts by recycling the boiler when
the temperature is “Stepped Modulation Recycle Offset” degrees below the Limit
setting. For example, when the setting is 10 F the boiler will recycle.

Applicable to the following measurements.
Supply Temperature (High Limit 210 F)(see Note below),
Differential Temperature (Differential Temperature Limit 100 F),
Stack Temperature (Stack Limit 230 F),

Note: This feature is not active for Supply temperature when it is the modulation
sensor. For example, this feature is active when Header Sensor is selected as
modulation sensor, when a boiler is a slave, when a boiler is responding to a remote
modulation demand (4-20mAdc or Modbus).

210 (ºF)

60 to 210 (ºF)

Preferred Supply High Limit
Adjustable high limit for the supply temperature. Only adjustable to a number below the
maximum High Limit in the control.

230 (ºF)

150 to 230 (ºF)

Preferred Stack High Limit
Adjustable high limit for the stack temperature. Only adjustable to a number below the
maximum Stack Limit in the control.

Press to adjust the following

parameters.

Press to adjust the following

parameters.

Page 43 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning

Press

Factory

Setting

Range /

Choices

Parameter and

Description

3 1 to 5

Response Speed
This parameter adjusts the Central Heat temperature controller Proportion Integral

Derivative (PID) values. Higher values cause a larger firing rate change for each
degree of temperature change. If set too high firing rate “overshoots” required value,
increases to high fire causing the temperature to exceed the “Difference Above”
setpoint and cycle the boiler unnecessarily. Lower values cause a smaller firing rate
change for each degree of temperature change. If set too low, the firing rate response
will be sluggish and temperature will wander away from setpoint. Refer to Table 11
for PID values used by these selections.

44

0 to 400

Proportional Rate

Proportional Gain value for Central Heat control modes. A larger gain value results
in tighter, more active, PID control. Gain is the primary PID modulation rate tuning
adjustment and provides the immediate modulation rate response. Pick a

gain

based

on the desired initial response. The burner modulation rate can oscillate if the
Proportional Gain is too large.

45

0 to 400

Integral Rate

Integral gain value For Central Heat control Modes. A larger value makes the Integral
ramp in less time (i.e., faster). Integral is a secondary PID modulation rate tuning
adjustment that ramps the output over time (typically minutes). Based on the selected
Local PID P, select the corresponding (from above table) Integral value. Repeats per
minute between 0.5 and 2.0 are typical. The burner modulation rate can oscillate if
the Integral time is too large.

0 min

0 to 30 min

Central Heat Low Fire Hold Time
“Low Fire Hold Time” is the number of seconds the control will wait at low fire
modulation rate before being released to modulate. After ignition and flame
stabilization periods the firing rate is held at low fire for “Low Fire Hold Time”.
This delay allows heat to travel out to the system and provide system feedback
prior to the control modulating firing rate.

1200 RPM

1200 to

1300

RPM

Central Heat Low Fire Hold Rate
“Low Fire Hold Rate” is the modulation rate the boiler will fire at for the duration
of the “Low Fire Hold Time” before being released to modulate. After ignition
and flame stabilization periods the firing rate is held at “Low Fire Hold Rate” for
“Low Fire Hold Time”. This delay allows heat to travel out to the system and
provide system feedback prior to the control modulating firing rate.

Tune

to access the following menus.

Press

Central Heat

Tuning

within the Tune menu to adjust the following parameters

Page 44 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning

Press

Factory

Setting

Range /

Choices

Parameter and

Description

3

1 to 5

Response Speed
This parameter adjusts the Domestic Hot Water temperature controller Proportion

Integral Derivative (PID) values. Higher values cause a larger firing rate change for
each degree of temperature change. If set too high firing rate “overshoots” required
value, increases to high fire causing the temperature to exceed the “Diff Above”
setpoint and cycle the boiler unnecessarily. Lower values cause a smaller firing rate
change for each degree of temperature change. If set too low, the firing rate response
will be sluggish and temperature will wander away from setpoint.

44

0 to 400

Proportional Rate

Proportional Gain value for Domestic Hot Water control modes. A larger gain value
results in tighter, more active, PID control. Gain is the primary PID modulation rate
tuning adjustment and provides the immediate modulation rate response. Pick a
gain based on the desired initial response. The burner modulation rate can oscillate
if the Proportional Gain is too large.

45

0 to 400

Integral Rate

Integral gain value For Domestic Hot Water control Modes. A larger value makes the
Integral ramp in less time (i.e., faster). Integral is a secondary PID modulation rate
tuning adjustment that ramps the output over time (typically minutes). Based on the
selected Local PID P, select the corresponding (from above table) Integral value.
Repeats per minute between 0.5 and 2.0 are typical. The burner modulation rate can
oscillate if the Integral time is too large.

0 min

0 to 30 min

Domestic Hot Water Low Fire Hold Time
“Low Fire Hold Time” is the number of minutes the control will wait at low fire
modulation rate before being released to modulate. After ignition and flame
stabilization periods the firing rate is held at low fire for “Low Fire Hold Time”.
This delay allows heat to travel out to the system and provide system feedback
prior to the control modulating firing rate.

1200 RPM

1200 to

1300

RPM

Domestic Hot Water Low Fire Hold Rate
“Low Fire Hold Rate” is the modulation rate the boiler will fire at for the duration
of the “Low Fire Hold Time” before being released to modulate. After ignition
and flame stabilization periods the firing rate is held at “Low Fire Hold Rate” for
“Low Fire Hold Time”. This delay allows heat to travel out to the system and
provide system feedback prior to the control modulating firing rate.

Domestic Hot Water

Tuning

within the Tune menu to adjust the following parameters

Page 45 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning

Press

Lead-Lag Tuning

within the Tune menu to adjust the following parameters

Factory

Setting

Range /

Choices

Parameter and

Description

3

1 to 5

Response Speed

This parameter adjusts the Sequence Master temperature controller

Proportion Integral
Derivative (PID) values. Higher values cause a larger firing rate change for each
degree of temperature change. If set too high firing rate “overshoots” required value,
increases to high fire causing the temperature to exceed the “Diff Above” setpoint and
cycle the boiler unnecessarily. Lower values cause a smaller firing rate change for
each degree of temperature change. If set too low, the firing rate response will be
sluggish and temperature will wander away from setpoint.

22

0 to 400

Proportional Rate

Proportional Gain value for Sequencer control modes. A larger gain value results in
tighter, more active, PID control. Gain is the primary PID modulation rate tuning
adjustment and provides the immediate modulation rate response. Pick a

gain

based

on the desired initial response. The burner modulation rate can oscillate if the

Proportional Gain is too large.

7

0 to 400

Integral Rate

Integral gain value For Sequencer control Modes. A larger value makes the Integral
ramp in less time (i.e., faster). Integral is a secondary PID modulation rate tuning
adjustment that ramps the output over time (typically minutes). Based on the selected
Local PID P, select the corresponding (from above table) Integral value. Repeats per
minute between 0.5 and 2.0 are typical. The burner modulation rate can oscillate if
the Integral time is too large.

Page 46 of 68

Boiler Control Instruction & Operation Manual

Setup & Tuning

Press

Fan Tuning

within the Tune menu to adjust the following parameters

Factory

Setting

Range /

Choices

Parameter and

Description

500

rpm/sec.

0 to 12000

Fan Speed-Up Ramp
Whenever the burner is firing it will be commanded to increase its RPM no faster
than the rate provided by this parameter. This is a maximum speed limit.

500

rpm/sec.

0 to 12000

Fan Speed-Down Ramp
Whenever the burner is firing it will be commanded to decrease its RPM no faster
than the rate provided by this parameter.

15

1 to 100

Fan Gain Up
This is the gain for speeding up the fan.

8

1 to 100

Fan Gain Down
This is the gain for slowing down the fan.

Disabled

Enable

Disable

CH Slow Start Enable/Disable
This parameter enables or disables the slow start limit function for Central Heat and
Sequence Master demand sources. It uses the CH Low Fire Hold Rate

parameter

as

the starting point for the slow start.

Disabled

Enable

Disable

DHW Slow Start Enable/Disable
This parameter enables or disables the slow start limit function for DHW demand
source. It uses the DHW Low Fire Hold Rate parameter as the starting point for the
slow start.

20

degrees

0 to 180

Slow Start Degrees
If slow start limiting is enabled and the supply temperature is less than the
temperature provided by subtracting this number of degrees from the setpoint, then
slow start rate limiting is effective. Whenever the supply temperature is above this
value, slow start limiting has no effect.

200

%/min.

0 to 1000

Slow Start Ramp
When slow start limiting is in effect, the modulation rate will increase no more than
the amount per minute given by this parameter. Although provided as a per-minute
value, the Control will calculate and apply this as a stepped function using step
duration of 10 seconds.

Page 47 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting

General Issues

Indication

Condition

Possible

Cause

Boiler not responding to call

for

heat, “Status” and “Priority”

show

“

Standby”.

Demand

Not

Detected

Boiler is not seeing Enable/Disable of Domestic Demand
Input. Check wiring loose connection, miswiring. If Domestic
Demand is expected check that DHW Demand/ Modulation
is selected properly.

Boiler not responding to a call

for

heat, “Status” shows

“Standby”

and “Priority” shows Central

Heat

or Domestic Hot

Water.

Pumps

Running

and

Boiler is

not

Running

Boiler is not firing, temperature is greater than setpoint. Select
display Help icon and review Limit String Status.

Boiler Running but

System

or Boiler Circulator is not

running

Pumps

Not

Running

 Check wiring for loose connection, miswiring.
 When there is a Domestic Hot Water Heat Request the

System or Boiler pumps will be forced “off” when there “Run
Pump for” parameter is set to “Central heat, off DHW
demand” or “Central Heat, Optional Priority”. This has been
set to allow all of the heat to be provided for fast indirect
water heater recovery. After “priority protection” time or the
end of the Domestic Hot Water Heat Request the system
and boiler pumps will be free to run.

Display Completely

Dark

Fan off, LWCO lights off, no

green

power light on

Control

No

120Vac

Power

at

Boiler

 Check breaker and wiring between breaker and boiler.
 Blown high voltage fuse or breaker tripped.

Display Completely Dark,

Fan running

No

24Vac

Power

to

Control

No 24 Vdc to

Display

 Loose 120Vac connection wiring between boiler J-Box and

transformer or 24 Vdc power supply.

 Loose 24 Vac wiring connection between transformer and

Control.

 Blown low voltage fuse or transformer blown.
 Bad transformer or bad 24 Vdc power supply.

Blinking Green power light on

Control

Control

Fault

The green light is connected to internal power supply. The power
supply is repeatedly starting and stopping (not normal) making
the light flash. The microprocessors are not running. Try
disconnecting all terminals except 24VAC to power the Control.
The green light should be steady. If it is not, then the control is
defective. If steady, start plugging in all the connectors while
watching the green light. When faulty wiring reconnected, green
light will begin to flash.

WARNING

Electrical Shock Hazard. Turn off power to boiler before working on wiring. This boiler must only

serviced by skilled and experienced service

Troubleshooting when “Help” icon NOT flashing;

technician.

be

Page 48 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
General Issues (continued)

Faults are investigated by selecting the “Help” button from the “Home” screen. When a fault is active

Indication

Condition

Possible

Cause

Blank Screen with

“Reading” shown

Display

lost

communication

with

control

Failure to establish Communication upon display boot-up once you
establish communication, reboot display to read controller and setup
display properly.

Communication

Error

2

Communication

Fault

The display write attempt has failed. Possible causes are that the
password level is too low for the parameter being changed, the
controller is un-configured, or has a memory failure. Lockout 20
Safety Data Verification will be displayed if control is not configured

or has had a memory loss. In this case replace control.

Communication

Error

3

Communication

Fault

Display has lost communication with controller.

- Loose or defective display harness

- Defective Display

- Defective Control

- Incorrect Communication Parameters (See page 22)

the “Help” button flashes red. Continue selecting the flashing buttons to be directed to the Fault
cause.

Figure 21: General Alarms

Page 49 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
General Issues (continued)

Flashing

Red

Outline

Condition

Possible

Cause

Rate

Limit

Status

The following messages appear when the firing rate is limited or reduced to
help avoid unnecessary cycling or lockout. Refer to Soft and Hard Lockout
sections for potential corrective action.

- High Stack Temperature Rate Limit (Temp > 210 F)

- High Supply Temperature Rate Limit (Temp > 190 F)

- High Differential Temperature Rate Limit (Delta T > 80 F)

- Minimum Modulate (normal start/stop sequence )

- Forced Modulation (normal start/stop sequence)

- Burner Control Rate (normal start/stop sequence)

- Manual Firing Rate ( User selection)

- Low Fire Hold (user selection)

Boiler

Size

Fault

WARNING!

Boiler size setting may not match actual boiler size.
The Boiler size setting determines min, max and light-off blower speeds.

Incorrect boiler size can cause hazardous burner conditions and improper
operation that may result in PROPERTY LOSS, PHYSICAL INJURY, OR
DEATH.

Sequencer

Fault

This alarm is active if the slave boiler has lost communication with the
Sequence Master. Check the following:

- RJ 45 peer-to-peer network disconnected

- Sequencer Master was Enabled and then Disabled

- Master’s Boiler has been powered down.

- To clear fault restore communication or cycle power

EMS Status

EMS

Status

This alarm is active if there is a fault with the Energy Management System
(EMS) interface. Signals received from the EMS are listed with selection
status and present value.

Service Contact

Service
Contact

The user is given the contact information of the responsible installing
contractor, service company, representative and manufacturer. Refer to
page 35 for data entry instructions

Reset Control

Reset

Control

When the lockout condition has been cleared, manual reset hard Lockouts
maybe reset here or on the top of the control.

Page 50 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting

Sensors Status

Indication

Possible

Cause

Not Installed

The sensor has not been selected. As shown in Figure 22 above, the Header sensor has
not been selected. Refer to the Parameter Adjustment section for additional information.

Open

Check sensor wiring. Sensor open will show if the sensor has not yet been wired to the
boiler or if a wire is loose.

Shorted

Check sensor wiring. Sensor terminals are connected to each other of the sensor has
failed.

Outside low range

Outside high range

Sensor input is out of range. Sensor is defective or is being subjected to electrical noise.

Not reliable

Sensor is unreliable. Sensor is defective or is being subjected to electrical noise.

The sensor status screen is selected from the MAIN or HELP menus. A failed sensor is shown with a red
background. By selecting on the individual sensors a larger display “gauge’ with applicable limits is provided. When
a sensor fails “opened” or “shorted” the value is changed to reverse video (background red and value black) and
shows “024” or “768” respectively to indicate that there is a fault with the sensor.

Supply -768 F Shorted

Figure 22: Sensor Screen shown with Shorted Supply Sensor

Each Sensor is provided with the following diagnostic information:

Page 51 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting

Limit String

The Limit String Status screen shows the safety limit status. A contact icon, either “ON” or “OFF”, graphically
represents each safety limit. The “ON” contact icon with normal text; the “OFF” contact icon is shown in red. “ON”
means that the contact is closed and there is no issue. An “OFF” limit means the contact is open and the limit is not
“made”.

Limit String Status screen (Figure 23) shows boiler limits in order, 120 Vac positive to neutral. When a limit is

“OFF”, all other contacts below (or “downstream”) that limit will also show as “OFF”. When troubleshooting, the first
Limit in the string of “OFF” Limits is the contact to inspect.

“ON” limits indicating the limits are
closed.

“OFF” limits indicating the limits are
open. In this case the contact at A6
(ILK) Thermal Fuse Limit is open. The
status of limits downstream is

Figure 23: Limit String Status

unknown.

NOTE: Some Limits cycle normally based on the function of the boiler. For example, the Low Air Pressure limit will
cycle to “OFF” after the boiler post purge is complete. The “Help” icon only indicates a fault (flashes) when the limit
string is not behaving normally.

Page 52 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting

Soft Lockouts (Holds)

Lockout

Number

Condition Possible

Cause

1

Anti-Short

Cycle

Minimum time between starts has
not been reached. Normal delay
used to avoid excessive cycles.

- Faulty contact provided by the EMS system.

2

Boiler

Recycling

Limits

Open

(LCI OFF)

The LCI input is not energized.

- Limit Control Input (LCI) is not ‘ON’. Refer to limit string
screen for list of limits.

- A wire is loose.

3

Boiler

Safety

Limit

Open

Boiler Safety Limit Interlock (ILK)
is OFF.

- Lockout input (ILK) is not ‘ON’. Refer to limit string screen
for list of limits.

- Loose wiring to limit device.

- Jumper not installed.

7

Return

sensor

fault

Shorted or open return temperature
sensor.

- Shorted or miswired return sensor wiring.

- Defective return sensor.

8

Supply

sensor

fault

Shorted or open supply
temperature sensor.

- Shorted or miswired supply sensor wiring.

- Defective supply sensor.

9

DHW

sensor

fault

Shorted or open Domestic Hot
Water (DHW) temperature sensor.

- Shorted or miswired DHW sensor wiring.

- Defective DHW sensor.

10

Stack

sensor

fault

Shorted or open flue gas (stack)
temperature sensor.

- Shorted or miswired flue temperature sensor wiring.

- Defective flue temperature sensor.

Display Faults

When a soft lockout occurs, the boiler will shut down and the “Help” button will “blink”. Select the “blinking”
“Help” button to determine the cause of the soft lockout. The boiler will automatically restart once the condition
that caused the lockout is corrected.

Figure 24: Soft Lockout Example

The Soft Lockout screen will display the Hold number, name of the Hold, the condition that caused the Hold,
possible causes, and a basic description of corrective actions that may be taken to fix the problem.

Below is an in-depth guide to all possible lockouts.

Page 53 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
Soft Lockouts (Holds) Continued

Lockout
Number

Condition

Possible Cause

13

Flame

rod

shorted

to

ground

Flame rod shorted to ground

- Shorted or miswired flame rod wiring.

- Defective flame rod.

14

Delta T

inlet/outlet

high

Temperature rise between supply
and return is too high.

- Inadequate boiler water flow. Verify that circulator is
operating and that circulator and piping are sized per
Installation Instructions Manual, Water Piping and Trim
Section.

15

Return

temp

higher

than

supply

The Control is reading a return
sensor temperature higher than
the supply sensor temperature.
Condition must be present for at
least 75 seconds for this error
code to appear.

- Flow through boiler reversed. Verify correct piping and

circulator

orientation.

- No boiler water flow. Verify that system is purged of air
and that appropriate valves are open.

- Sensor wiring reversed.

- Supply or return sensor defective.

16

Supply

temp

has risen

too

quickly

Supply water temperature has
risen too quickly.

- See possible causes for “Hard Lockout 4”.

- Inadequate boiler water flow.

- Verify that circulator is operating and that circulator and

piping are sized per Installation Instructions Manual,
Water Piping and Trim Section.

17

Blower

speed

not

proved

Normal waiting for blower speed
to match purge and light-off
setpoint.

-

27

Interrupted

Airflow

Switch On

Interrupted Airflow Switch Failed in
closed position

- The air proving switch has failed on, check switch is
operating properly

27 or

28

Interrupted

Airflow

Switch

Off

Interrupted Airflow Switch Failed to
Close

- The air proving switch has failed to close;

- Check switch, check switch connection and wiring.

- Blocked vent, blocked inlet, blocked or disconnected inlet

air switch tube, blocked heat exchanger or burner.

- Something is blocking air/flue gas flow through boiler

Page 54 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
Hard Lockouts

Display Faults

Lockout Number

Condition

Possible

Cause

3

Burner Interlock

Open

(ILK

OFF)

The safety limit input is not

energized.

- Limit(s) are open or a wire is loose.

- Ground in one of the wires.

4

Supply high

limit

Supply sensor

detected

temperatures exceeding

High

Limit.

- Heating load at time of error was far below the
minimum firing rate of the boiler.

- Defective system circulator or no flow in primary
loop.

- Defective boiler circulator, no flow or insufficient
flow in boiler loop.

- Control system miswired so that the boiler
operation is permitted when no zones are
calling.

5

DHW high

limit

DHW sensor

detected

temperatures in excess

of

Setpoint.

- DHW load at time of error was far below the
minimum firing rate of the boiler.

- Control system miswired so that boiler operation
is permitted when no DHW are calling.

6

Stack High

limit

Flue gas (Stack)

sensor

detected temperatures

in

excess of 204°F

(95.6°C).

- Heat exchanger needs to be cleaned.

- Boiler over-fired.

- Air-fuel mixture out of adjustment - consult

factory.

12

Flame detected out

of

sequence

A flame signal was

present

when there should be

no

flame.

- Defective gas valve - make sure inlet pressure is
below maximum on rating plate before replacing
valve.

When a fault is active the “Help” button flashes red. The “Help” button will lead you to the Help menu, which will
flash to indicate the issue with the boiler. If “Hard Lockout” is flashing select that button to investigate further.

Figure 25: Hard Lockout Example

The Hard Lockout screen will display the Lockout number, name of the lockout, the condition that caused the
lockout, possible causes, and a basic description of corrective actions that may be taken to fix the problem.

Below is an in-depth guide to all possible lockouts.

Page 55 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
Hard Lockouts (continued)

Lockout Number

Condition

Possible Cause

14

Delta T Inlet/Outlet

High

The difference between

the

inlet/return and

the

outlet/supply temperature

is

too

large.

- Inadequate boiler water flow

15

Return Temp Higher

Than

Supply

The temperature of

the

return/inlet is higher than

the

temperature of

the

supply/outlet

- Water flow reversed

- No flow, sensor reversed, sensor bad

16

Supply Temp Risen

Too

Quickly

The supply/outlet temperature

has risen too quickly.

- Water flow reversed

- No flow, sensor reversed, sensor bad

18

Light off rate proving

failed

Blower is not running at

Light-

off rate when it should

or

blower speed signal not

being

detected

- Heating load far below min

- Bad pump or low primary flow

- Boiler on with no zones on

19

Purge rate proving

failed

Blower is not running at

Purge

rate when it should or

blower

speed signal not

being

detected

- Loose connection in 120 VAC blower wiring.

- Loose or miswired blower speed harness.

- Defective blower

20

Configuration

Fault

Unacceptable Control

Safety

related parameter

detected.

(See display for

details)

- Safety Parameter verification required. Contact

factory.

21

Invalid

Modulation

Parameter

Unacceptable

Control

Modulation related

parameter

detected.

- Reset the control.

22

Safety data

verification

needed

Safety related

parameter

change has been detected

and

verification has not

been

completed.

- Safety related Control parameter has been

changed and verification has not been performed.

23

24VAC voltage

low/high

Control 24Vac control power is

high or low.

- Loose connection in 24Vac VAC power wiring.

- Loose or miswired 24Vac harness.

- Miswired wiring harness causing power supply

short to ground.

- Defective transformer.

- Transformer frequency, voltage and VA do not

meet specifications.

24

Fuel Valve

Error

Power detected at fuel

valve

output

when fuel valve should be

off.

- Loose or defective gas valve harness. Check

electrical connections.

- Defective gas valve (check for 24 Vac at harness

during trial for ignition before replacing valve).

25

Hardware

Fault

Internal control failure.

(See display for details)

- Reset the control. If problem reoccurs, replace

the Control.

26

Internal

Fault

Internal control failure.

- Reset the control. If problem reoccurs, replace

the Control.

Page 56 of 68

Boiler Control Instruction & Operation Manual

Trouble- Shooting
Hard Lockouts (continued)

Lockout Number

Condition

Possible Cause

27

Ignition

failure

Flame failure

- No gas pressure.

- Gas pressure under minimum value shown on

rating plate.

- Gas line not completely purged of air.

- Defective Electrode.

- Loose burner ground connection.

- Defective Ignition Cable.

- Defective gas valve (check for 24 Vac at harness

during trial for ignition before replacing valve).

- Air-fuel mixture out of adjustment - consult

factory.

27

Pre-Ignition Interlock

(PII)

OFF

Pre-Ignition Interlock Open

- Open or loose limit

27

Interrupted Airflow

Switch

(IAS)

OFF

Interrupted Airflow

Switch

Open

- Airflow too low

- Defective switch

27

Interrupted Airflow

Switch

(IAS) ON

Interrupted Airflow

Switch

Closed

- Unexpected airflow

- Defective switch

- Miswired

27

High Fire Switch

Fault

High Fire Switch Closed

- Miswired

- Defective switch

31

Fan

Failed

Fan speed failed

- Miswired

- VFD failed to check speed

32

ILK ON

This lockout occurs when

the

interlock string is closed

before

the blower starts. The

airflow

switch is the only device in

the

interlock string that will

open

when in

standby.

- Air pressure in the boiler room has become

negative.

- Excessive downdraft in the stack.

- Blower is spinning before being commanded by

the hydronic control. Make sure blower is not
running in standby.

- Airflow switch is stuck closed.

42

AC Phase

Fault

AC inputs phase reversed

- Check the control and display connection.

- Check the control power supply and make sure

that both frequency and voltage meet the specs

- Ensure 24 Vac is functioning properly

46

Pilot Test

Flame

Pilot Test Flame Timeout

- Pilot test flame timed out. Reset the control to

restart.

47

Flame

Lost

Flame lost in MFEP

- Pilot Valve (main Valve for DSI)

- Fuel Supply - No gas pressure, Gas pressure

under minimum value shown on rating plate, Gas
line not purged

- Defective flame sensor

- Loose ground

- Air/fuel mix out of adjustment

Flame Lost early in RUN

Flam Lost in RUN

284

Memory Reset To

Default

OEM Memory Lost,

Honeywell

Default Memory

Restored

- Controller Failure

- Consult Factory

- Replace Control

Page 57 of 68

Boiler Control Instruction & Operation Manual

Trouble Shooting
Using Archives

The archives are a fundamental resource for the users interested in commissioning, optimizing and trouble
shooting an issue with the boiler. Using the archives a user may review up to 4 months of sensor values,
up to 3000 alarms, lockout history or cycle and run history. Data may be simply viewed on screen or
exported to a thumb drive for detailed analysis.

Supply/Return Temperature History / Flame
Intensity History / Fan Rate History

Supply, Return, flame and fan data provides an
opportunity to investigate issues, learn about
system operation or fine tune the boiler. Values
are stored on the display for up to 4 months.
Data may be easily backed up to a thumb drive.
Historical data values are viewed by scrolling left
and right, the further left, the older the data. By
touching the trend at any location, the exact data
points will display as well as the Date and Time
at which they were recorded.

Lockout History
Lockout History is stored in a first-in, first-out
basis. Each lockout file is stored with boiler run
hour of when the lockout occurred, status at the
time of the lockout, and the Annunciator in the
limit string that caused the lockout (Only if
applicable to that lockout). Up to 15 lockouts
may be stored in the Lockout History, 1 being the
newest. Touching the lockout shows more
information about the lockout that occurred.

Cycle & Run Time History
Cycle and Run time data is provided for control,
boiler and pumps. Additionally, a load profile is
collected. Graphs are provided that show
amount of time the boiler operated at each load
point. Data may be reset.

Page 58 of 68

Boiler Control Instruction & Operation Manual

Trouble Shooting
Using Archives

Alarm History

The alarm history is a powerful tool that will record up to 3000 alarms. These alarms include Lockouts, Holds,

Sensor Faults, EMS Communication Error or Loss, Boiler-to-Boiler Network Communication Loss, 4-20mA
Errors, and Limit String Cycling.

The alarms are recorded in a list with the most recent appearing at the bottom. The alarm list can be scrolled through
to investigate past alarms and most current alarms. The alarms are given a date and time stamp which allows for
better troubleshooting capability. The alarm list may be downloaded to a USB in the form of a spreadsheet by using
the Save to Historical Data function in the Archives Menu.

Page 59 of 68

Boiler Control Instruction & Operation Manual

Trouble Shooting
Using Archives

USB Thumb Drive Requirements
The Thumb Drive must be formatted as a FAT32 for use with the display. In order to check the format of a
USB Thumb Drive, follow these instructions:

 Plug the USB Drive into a computer
 Ensure that the USB Drive does not have anything currently saved on it.
 Go to My Computer (Select Start > Computer)
 Right click on the “Removable Disk” and select Properties
 Under the “General” tab confirm “File system: FAT32”
 If it does not say FAT32, close window, return to My Computer
 Right Click on the “Removable Disk” and select Format
 Select File system = FAT32
 Select Start and then select OK to format the USB Thumb Drive.
 The USB Thumb Drive is now FAT32 format

Save Historical Data

“Save Historical Data” will save historical parameter data and the current alarm list as spreadsheets to the
USB Drive that is plugged into the Boiler Display. The files will have a date code in the file name,
year/month/date, of when they were saved from the boiler. That CSV files will be saved to the USB thumb
drive under the following path:

My Computer > Removable Disk (USB Drive) > HMI > HMI000 > @HMI0001 > CSV

NOTE: @HMI0001 is newer than @HMI0000. If another set of historical data is saved from the display,

the new file will be saved as @HMI0002. The highest number is the newest data.
NOTE: Trend1-20140612.csv & Alarm20140612 are the names of the files that saved from the boiler in

the example above. The 20140612 is the date code of whenever the data was retrieved from the boiler. In
the example shown it was the year 2014, the 6

th

month of the year, 12

th

day of that month.

Page 60 of 68

Boiler Control Instruction & Operation Manual

Trouble Shooting
Using Archives

An example of the Trend1-20141022.csv file follows:

Boiler State

#

Initiate 0

Standby delay

1 Standby 2

Safe Startup

3

Drive Purge

4

Prepurge

5 Drive Lightoff

6

Preignition Test

7 Preignition

8 PFEP 9

MFEP 10

Direct Ignition

11 Running 12

Postpurge

13 Lockout 14

Table 12, Boiler State

Page 61 of 68

Boiler Control Instruction & Operation Manual

Trouble Shooting
Using Archives

An example of the Alarm-20141022.csv file follows:

Save Parameters to USB

“Save Parameters” saves the current parameter settings of the boiler, including the contact information of the
contractor, Service Company, and sales representative, to a USB Drive. This allows for easy transfer of boiler
parameters from one boiler to another. Refer to parameter summary for list of parameters.

Instructions for Save Parameters:

1. Plug USB thumb drive into USB Port on Boiler

2. Select Main Menu > Archives > Save Parameters to USB

3. Confirm or Cancel Save Parameters.

Once procedure is complete the display saves two files in a directory as follows:

My Computer > Removable Disk (USB Drive) > HMI > HMI000 >

- Parameter File: Recipe.csv

- Contact Information Recipe32.csv:

Load Parameters from USB

“Load Parameters” loads the current saved parameter settings off a USB Drive. This allows for easy transfer of boiler
parameters and contact information from one boiler to another. Refer to parameter summary for list of parameters.
Parameter files must be stored and named as follows:

My Computer > Removable Disk (USB Drive) > HMI > HMI000 >

- Parameter File: Recipe.csv

- Contact Information Recipe32.csv:

Instructions for Load Parameters:

1. Plug USB thumb drive into USB Port on Boiler

2. Select Main Menu > Archives > Load Parameters to USB

3. Confirm or Cancel Load of Parameters.

4. Confirm or Cancel Load of Contact Information.

Page 62 of 68

Boiler Control Instruction & Operation Manual

Specifications
General

Temp °C (°F)

10K NTC (kOhm)

Beta of 3950

30 (-22)

176.08

20 (-4)

96.81

10 (14)

55.25

0

(32) 32.64

10 (50)

19.9

20 (68)

12.49

25 (77) 10

30 (86)

8.06

40 (104)

5.32

50 (122)

3.6

60 (140)

2.49

70 (158)

1.75

80 (176)

1.26

90 (194)

0.92

100 (212)

0.68

110 (230)

0.51

120 (248)

0.39

Control

Display

Dimensions: 9 21/64” x 6 21/64”
Electrical Ratings:

 Operating voltage:

24Vac (20 to 30 Vac, 60 Hz ±5%)

 Pump Relay Outputs:

120 Vac: 44.4 ALR, 7.4 Amps run

 Alarm Relay Output:

120 Vac: 6.3 ALR, 0.63 Amps run

Operating Temperature:

-4°F to 150°F (-20°C to 66°C)

Storage Temperature:

-40°F to 150°F (-40°C to

Humidity: Up to 95% Relative Humidity,
noncondensing at 104°F for 14 days. Condensing
moisture may cause safety shutdown.

Vibration: to 0.5g Continuous (V2 level)
Sensors: All temperature sensors 10k NTC
NTC Sensors (temperature versus resistance).

66°C).

Dimensions:

 Bezel: 8.46” x 6.33” x 1.96”
 Panel Cutout: 7.75” x 5.62”

Electrical Ratings:

 Operating voltage: DC +24V（-10% ~+15%）

(please use isolated power supply)

 Power Consumption: 5W

 Backup Battery

3V Lithium Battery CR2032, about 3 years
operating life with power removed. Battery
used to maintain time and date clock, not
display memory.

Operating Temperature:

32ºF ~ 140ºF (0ºC ~ 60ºC)

Storage/Shipping Temperature:

-4°F ~ 140ºF (-20ºC ~ 60ºC)

Humidity:

 10% ~ 90% RH [0 ~ 40°C], 10% ~ 55% RH

[41 ~ 50°C]

Vibration:

 IEC 61131-2 Compliant
 5Hz ≦ f ＜ 9Hz = Continuous: 1.75mm /

Occasional: 3.5mm

 9Hz ≦ f ≦ 150Hz = Continuous: 0.5g /

Occasional: 1.0g

 X, Y, Z directions for 10 times

Enclosure: NEMA 4/IP65.

Page 63 of 68

Boiler Control Instruction & Operation Manual

Specifications

Part Number

Name

Description

105681-01

Control

Commercial Concert Boiler Control, CSD-1 Compliant, Auto
Temperature Control, 120 Vac Ignition Control, 8 Limit Monitoring
Points, with Pre-purge and Post Purge, Safety Rated Temperature
Limit, PWM and 4-20mAdc Firing rate outputs, circulator relay outputs.

105682-01

Display

7 inch LCD Touch Screen Display, 24Vdc Power Supply, USB
Connection, two RS485 Modbus ports

105686-01

Supply Sensor or

Flue Gas Sensor

10k ohm, dual element, three wire, limit rated, thermistor type,
temperature sensor, 6 inch lead wires, female Molex 0039014037
quick connector, 3/8 inch diameter.

105685-01

Return Sensor

10k ohm, single element, two wire thermistor type, temperature
sensor, 6 inch lead wires, female Molex 0039013029 quick connector,
3/8 inch diameter.

101935-01

Direct

Immersion

Type

DHW

Sensor

Header

Sensor

10K ohm, single element, two wire thermistor type, Direct Immersion
temperature sensor. Insertion is ½” NPT.

105685-01

Thermowell

Type

DHW

Sensor

Header Sensor

10K ohm, single element, two wire thermistor type, temperature
sensor, suitable for insertion into thermowells. Thermowell not
included.

105684-01

Thermowell

½”NPT Brass Immersion Well.

106035-01

Wireless

Outdoor

Sensor

Kit

Wireless outdoor air reset adapter, includes wireless receiver module
and wireless outdoor sensor. The receiver provides a wireless
connection to the outdoor mounted sensor. Receiver is wired to the
control’s EnviraCOM terminals.

801SOL0012

Wired

Outdoor

Sensor

10k ohm, single element, two wire thermistor type, temperature
sensor, outdoor air temperature sensor with weather proof box and
protective sleeve.

BACnet

Universal

Gateway

Kit (includes

gateway

&

manual)

Energy Management Systems (EMS) Universal Gateway translates
Modbus 485 to BACnet MS/TP, BACnet/IP, Metasys N2 Open, or
Modbus TCP. Compatible with Concert Boiler Control, Apex Boiler
Control (ABC), Thermal Solutions Boiler Control (TSBC), Sage2.1
Control.

LonWorks

Universal

Gateway Kit

(includes

gateway &

manual)

Energy Management Systems (EMS) Universal Gateway translates
Modbus 485 to LonWorks. Compatible with Concert Boiler Control,
Apex Boiler Control (ABC), Thermal Solutions Boiler Control (TSBC),
Sage2.1 Control.

CR2032

Display Battery

3V Lithium Battery. Used to maintain time and date clock.

General

Replacement Parts
Listed in Table 1 are the replacement parts available for the Free Flex Boiler. These include
temperature sensors, the control, display, and more. Part numbers are included to simplify the
ordering process.

106432-02

106433-02

Page 64 of 68

Boiler Control Instruction & Operation Manual

Specifications
Parameter Summary

USB

Parameter Range

Security

Page

System Menu

X

Temperature Units

F / C

Basic

30 X Outdoor Sensor Source

Not Installed / Modbus / Wired / Wireless

Basic

30 X Outdoor Sensor Calibration

- 50 to 50 °

Basic

30 X Antishort Cycle Time

0 - 20 minutes

Basic

30 X CH Frost Protection

Enable / Disable

Basic

30 X CH Frost Protection Setpoint

- 50 to 50 °F

Basic

30 X Installer Password

none

Factory

31 X Warm Weather Shutdown Enable

Enable / Disable

Basic

31 X Warm Weather Shutdown Setpoint

20 to 100 °F

Basic

31

System Date

Basic

31

System Time

Basic

31 X Auto Jump To Home Page

Enable / Disable

Basic

31

Modulation Menu

Boiler Type

NA

Factory

32

CH Max Modulation Rate

(Min Mod Rate + 100) to Absolute Max Mod

Factory

32

DHW Max Modulation Rate

(Min Mod Rate + 100) to Absolute Max Mod

Factory

32

Minimum Modulation Rate

Absolute Min Mod to (CH Max Mod Rate - 100)

Factory

32

Lightoff Rate

Min Modulation to Default Lightoff Rate

Factory

32

Operation Menu

Auto/Manual

Auto / Manual

Supervisor

28

Rate

Min Mod Rate to CH Max Mod Rate

Supervisor

28

Pump Menu

X

System Pump

Never / Any Demand / Central heat, No Priority /

Central Heat Optional Priority / Fresh Air Damper

Supervisor

33

X

Boiler Pump

Never / Any Demand / Central Heat, Off DHW

Supervisor

33

X

DHW Pump

Never / Primary loop Piped IWH / Boiler Piped IWH /

Fresh Air Damper

Supervisor

34 X CH pump overrun time

0 to 60 minutes

Supervisor

34 X DHW pump overrun time

0 to 60 minutes

Supervisor

34 X Boiler pump overrun time

0 to 60 minutes

Supervisor

34

X

Pump exercise interval

0 to 40 days

Supervisor

34 X Pump exercise time

0 to 600 seconds

Supervisor

34

Central Heat Menu

X

CH Setpoint

50 to 190 °F

Basic

36

X

CH TOD Setback Setpoint

50 to 190 °F

Basic

36 X CH Difference Above

3 to 29 °F

Basic

36 X CH Difference Below

3 to 29 °F

Basic

36 X CH Response Speed

1 to 5

Supervisor

36 X CH Modulation Sensor

Outlet Sensor / Header Sensor

Supervisor

37 X Central Heat Low Fire Hold Time

0 to 30 minutes

Supervisor

37 X Central Heat Low Fire Hold Rate

Absolute Min Mod to Lightoff Rate Default

Supervisor

37

Domestic Hot Water Menu

X

DHW Priority Time

0 to 90 minutes

Basic

37

X

DHW Setpoint

50 to 190 °F

Basic

37 X DHW TOD Setback Setpoint

50 to 190 °F

Basic

37

X

DHW Difference Below

3 to 29 °F

Basic

37

X

DHW Difference Above

3 to 29 °F

Basic

37

X

DHW Response Speed

1 to 5

Supervisor

38 X Domestic Low Fire Hold Time

0 to 30 minutes

Supervisor

38 X Domestic Low Fire Hold Rate

Absolute Min

Supervisor

38

X

DHW Demand/Modulation

DHW Switch & Outlet Sensor /

DHW Sensor & DHW Sensor

Basic

38

Outdoor Reset Menu

X

Outdoor Reset Enable/Disable

Enable / Disable

Basic

39

X

Minimum Outdoor Temperature

- 50 to 32 °F

Basic

39 X Maximum Outdoor Temperature

35 to 100 °F

Basic

39

X

Low Water Temperature

70 to 180 °F

Basic

39 X Minimum Boiler Water Temperature

50 to 185 °F

Basic

39

Page 65 of 68

Boiler Control Instruction & Operation Manual

Specifications
Parameter Summary

USB

Parameter Range

Security

Page

X

Boost Time

0 to 30 minutes

Basic

39

X

Central Heat ODR Max Off Point

50 to 190 °F

Basic

39

X

Lead Lag CH ODR Max Off Point

50 to 190 °F

Basic

39

Sequence Master Menu

Master Enable/Disable

Disable / Enabled

Supervisor

40

Base Load Common Rate

25 to 100 %

Supervisor

40

Indirect Water Heater

Boiler Piped / Primary Piped

Supervisor

40

Boiler Start Delay

0.5 to 20 minutes

Supervisor

40

DHW Two Boiler Start

Enable / Disable

Supervisor

40

Stop All Boilers

50 to 195 °F

Basic

40

Boiler Stop Delay

0.5 to 5 minutes

Supervisor

40

Lead Rotation Time

8 to 48 hours

Basic

40

LL Response Speed

0 to 5

Supervisor

40

Slave Sequencer Menu

Slave Selection Order

First / Normal / Last

Supervisor

41

Boiler Address

1 to 8

Supervisor

41

Limits Menu

X

Stepped Modulation Start Offset

(Stepped Modulation Recycle Offset + 6) - 30

Factory

41

X

Stepped Modulation Recycle Offset

10 - (Stepped Modulation Start Offset - 6)

Factory

41

X

Preferred Stack Limit Setpoint

150 °F to Stack Default Limit

Factory

41

X

Preferred Outlet Limit Setpoint

60 °F to Outlet Default Limit

Factory

41

EMS Remote Demand Menu

Modulation Source

Local / 4 - 20mAdc / Modbus

Supervisor

20

CH Demand Switch

Local / Modbus

Supervisor

20

LL Demand Switch

Local / Modbus

Supervisor

20

4mA Water Temp

50 to 185 °F

Supervisor

20

Lead Lag Setpoint Source

Local / 4 - 20mAdc / Modbus

Supervisor

20

Central Heat Setpoint Source

Local / 4 - 20mAdc / Modbus

Supervisor

20

20mA Water Temp

50 to 185 °F

Supervisor

20

Analog Input Hysteresis

0 to 10

Supervisor

20

Analog output hysteresis

0 to 40

Supervisor

20

Analog Rate Tracking

Disable / PWM to 4 - 20mA / PWM to 0 - 10V / LL

Rate to 4 - 20mA / LL Rate to 0 - 10V

Supervisor

20

Fan Tune Menu

X

Fan speed - up ramp

0 to 12000

Supervisor

44

X

Fan slow - down ramp

0 to 12000

Supervisor

44

X

Fan gain up

1 to 100

Factory

44

X

Fan gain down

1 to 100

Factory

44

X

CH slow start enable/disable

Enable - Disable

Supervisor

44

X

DHW slow start enable/disable

Enable - Disable

Supervisor

44

X

Slow start ramp

0 to 1000 rpm

Supervisor

44

X

Slow start degrees

0 °F to 180

Supervisor

44

NOTES

“Load Parameters” loads the current saved parameter settings off a USB Drive. This allows for easy transfer of
boiler parameters and contact information from one boiler to another.

Page 66 of 68

Boiler Control Instruction & Operation Manual

Notes

Page 67 of 68

Boiler Control Instruction & Operation Manual

783 N Chili Ave

Peru, IN 46970

Telephone [phone]
Fax [phone]

www.bryanboilers.com

Page 68 of 68