Energy Star K2 Operating Instructions Manual
OPERATING INSTRUCTIONS
FOR
K2™
CONDENSING HIGH EFFICIENCY
DIRECT VENT
GAS - FIRED HOT WATER BOILER
9700609
As an ENERGY STAR
STAR® guidelines for energy efciency established by the United States Environmental Protection Agency (EPA).
®
Partner, U.S. Boiler Company has determined that the K2™ Series meets the ENERGY
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage,
injury, or loss of life. For assistance or additional information, consult a qualied installer, service agency or the
gas supplier. This boiler requires a special venting system. Read these instructions carefully before installing.
105337-02 - 9/14
Price - $5.00
1
IMPORTANT INFORMATION - READ CAREFULLY
NOTE: The equipment shall be installed in accordance with those installation regulations enforced in the area where the
installation is to be made. These regulations shall be carefully followed in all cases. Authorities having jurisdiction
shall be consulted before installations are made.
All wiring on boilers installed in the USA shall be made in accordance with the National Electrical Code and/or local
regulations.
All wiring on boilers installed in Canada shall be made in accordance with the Canadian Electrical Code and/or local
regulations.
The City of New York requires a Licensed Master Plumber supervise the installation of this product.
The Massachusetts Board of Plumbers and Gas Fitters has approved the K2™ Series boiler. See the Massachusetts Board of
Plumbers and Gas Fitters website, http://license.reg.state.ma.us/pubLic/pl_products/pb_pre_form.asp for the latest Approval
Code or ask your local Sales Representative.
The Commonwealth of Massachusetts requires this product to be installed by a Licensed Plumber or Gas Fitter.
The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels,
or to important information concerning product life.
DANGER
Indicates an imminently hazardous situation
which, if not avoided, will result in death, serious
injury or substantial property damage.
Indicates a potentially hazardous situation which,
if not avoided, may result in moderate or minor
injury or property damage.
CAUTION
NOTICE
WARNING
Indicates a potentially hazardous situation which,
if not avoided, could result in death, serious injury
or substantial property damage.
Indicates special instructions on installation,
operation, or maintenance which are important
but not related to personal injury hazards.
DANGER
Explosion Hazard. DO NOT store or use gasoline or other ammable vapors or liquids in the vicinity of this
or any other appliance.
If you smell gas vapors, NO NOT try to operate any appliance - DO NOT touch any electrical switch or use
any phone in the building. Immediately, call the gas supplier from a remotely located phone. Follow the gas
supplier’s instructions or if the supplier is unavailable, contact the re department.
2
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WARNING
Asphyxiation Hazard. This boiler requires regular maintenance and service to operate safely. Follow
the instructions contained in this manual.
Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Read and understand the entire manual before attempting installation,
start-up operation, or service. Installation and service must be performed only by an experienced,
skilled, and knowledgeable installer or service agency.
This boiler must be properly vented.
This boiler needs fresh air for safe operation and must be installed so there are provisions for
adequate combustion and ventilation air.
Asphyxiation Hazard. The interior of the venting system must be inspected and cleaned before the
start of the heating season and should be inspected periodically throughout the heating season for
any obstructions. A clean and unobstructed venting system is necessary to allow noxious fumes
that could cause injury or loss of life to vent safely and will contribute toward maintaining the boiler’s
efciency.
Installation is not complete unless a safety relief valve is installed into the tapping located on left
side of appliance or the supply piping. - See the Water Piping and Trim Section of the K2 Installation
manual for details.
This boiler is supplied with safety devices which may cause the boiler to shut down and not re-start
without service. If damage due to frozen pipes is a possibility, the heating system should not be left
unattended in cold weather; or appropriate safeguards and alarms should be installed on the heating
system to prevent damage if the boiler is inoperative.
Burn Hazard. This boiler contains very hot water under high pressure. Do not unscrew any pipe
ttings nor attempt to disconnect any components of this boiler without positively assuring the water
is cool and has no pressure. Always wear protective clothing and equipment when installing, starting
up or servicing this boiler to prevent scald injuries. Do not rely on the pressure and temperature
gauges to determine the temperature and pressure of the boiler. This boiler contains components
which become very hot when the boiler is operating. Do not touch any components unless they are
cool.
Respiratory Hazard. Boiler materials of construction, products of combustion and the fuel contain
alumina, silica, heavy metals, carbon monoxide, nitrogen oxides, aldehydes and/or other toxic or
harmful substances which can cause death or serious injury and which are known to the state of
California to cause cancer, birth defects and other reproductive harm. Always use proper safety
clothing, respirators and equipment when servicing or working nearby the appliance.
Failure to follow all instructions in the proper order can cause personal injury or death. Read all
instructions, including all those contained in component manufacturers manuals which are provided
with the boiler before installing, starting up, operating, maintaining or servicing.
All cover plates, enclosures and guards must be in place at all times.
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Table of Contents
I. Operation 5
II. Troubleshooting 26
4
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I. Operation (A. Overview)
180 F
Boiler 1
Energy Save On
Max Efficiency On
Standby
i
Status
Help
Adjust
Detail
A. Overview
1. Sage 2.1 Controller
The Sage 2.1 Controller (Control) contains features and
capabilities which help improve heating system operation,
and efciency. By including unique capabilities, the Control
can do more, with less eld wiring, and fewer aftermarket
controls and components – improving the operation of both
new and replacement boiler installations.
2. Advanced Touch Screen Display
Home Screen
Boiler status and setup selections are available from an
easy to use, dual color, LCD Touch Screen Display. Over
one hundred helpful information screens are provide to
explain status information and setup functions. 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.
3. 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 ue gas temperatures to adjust fan
speed.
4. Built-in Safety Control
The Control includes safety controls designed to ensure safe
and reliable operation. In addition to ame safety controls
the Control includes supply water temperature, differential
water temperature, and stack temperature safety limits and
stepped modulation responses. Boiler modulation is adjusted
when required to help avoid loss of boiler operation due
to exceeding limits. Additionally, the Control accepts the
eld installation of optional auxiliary safety limits.
5. Outdoor Air Reset
When selected the modulation rate 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.
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6. Warm Weather Shutdown (WWSD)
Some boilers are used primarily for heating buildings,
and the boilers can be automatically shutdown when
the outdoor air temperature is warm. When outside air
temperature is above the WWSD setpoint, this function
will shut down the boiler, boiler and system pump.
7. 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.
8. 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 congured RS485 Modbus interface is available
for Energy Management System (EMS)monitoring
when not used for Multiple Boiler Sequencer Peer-ToPeer Network. Consult factory for points list or if this
interface must be used in addition to the boiler Peer-toPeer Network.
9. Circulator Control
The Control may be used to sequence the domestic hot
water, boiler and system circulators. Service rated relay
outputs are wired to a line voltage terminal block for easy
eld connection. Simple parameter selections allow all
three pumps to respond properly to various hydronic
piping arrangements including either a boiler or primary
piped indirect water heater. Circulators are automatically
run for a 20 second exercise period after not being used
for longer than 7 days. Circulator exercise helps prevent
pump rotor seizing.
10. Multiple Boiler Sequencer 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-to-peer communication.
The peer-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 congured 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.
5
I. Operation B. Supply Water Temperature Regulation (contineud)
B. Supply Water Temperature Regulation
1. Priority Demand
The Control accepts a call for heat (demand) from
multiple places and responds according to it’s “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 “Boiler Status” screen.
Table 1: Order of Priority
Priority
2nd Domestic Hot
Status Screen
Display
1st Sequencer
Control
Water
3rd Central Heat Central Heat call for heat is on and
4th Frost
Protection
5th Warm
Weather
Shutdown
(WWSD)
6th Standby There is no demand detected.
Boiler Responding to:
The boiler is connected to the peerto-peer network. The boiler accepts
demand from the Sequencer Master.
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.
there is no DHW demand or DHW
priority time has expired.
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.
WWSD is active and the boiler will
not respond to central heat demands.
DHW demand is not blocked by
WWSD.
2. Setpoint Purpose
The Control starts and stops the boiler and modulates
the boiler input from minimum (MBH) to maximum
(MBH) in order to heat water up to the active setpoint.
The setpoint is determined by the priority (Central Heat
or Domestic Hot Water) and as described in the following
paragraphs.
3. Central Heat Setpoint
Upon a Central Heat call for heat the setpoint is either
the user entered Central Heat Setpoint or is automatically
adjusted by a thermostat’s “Sleep” or “Away” modes and/
or Outdoor Air Reset or a Energy Management System
(EMS) supplied 4-20mAdc setpoint.
4. Outdoor Air Reset
If an outdoor temperature sensor is connected to the boiler
and Outdoor Reset is enabled, the Central Heat setpoint
will automatically adjust downwards as the outdoor
temperature increases. When the water temperature is
properly matched to heating needs there is minimal chance
of room air temperature overshoot. Excessive heat is
not sent to the room heating elements by “overheated”
(supply water temperature maintained too high a setting)
water. Reset control saves energy by reducing room
over heating, reducing boiler temperature & increasing
combustion efciency and reducing standby losses as a
boiler and system piping cool down to ambient following
room over heating.
5. Boost Time
When the Central Heat Setpoint is decreased by Outdoor
Air Reset settings the Boost function can be enabled to
increase the setpoint in the event that central heat demand
is not satised for longer than the Boost Time minutes. The
Boost feature increases the operating temperature setpoint
by 10°F (5.6°C) every 20 minutes (eld adjustable) the
central heat demand is not satised. This process will
continue until heat demand is satised (indoor air is at
desired temperature). Once the heat demand is satised,
the operating setpoint reverts to the value determined by
the Outdoor Air Reset settings. If Boost Time is zero,
then the boost function is not used.
6. Domestic Hot Water (DHW) Setpoint
Upon a DHW call for heat the setpoint is either the user
entered DHW setpoint or the Thermostat’s “Sleep” or
“Away” DHW setpoint. The optimal value of this setpoint
is established based on the requirements of the indirect
water heater.
7. Domestic Hot Water Priority (DHWP)
When domestic hot water priority is selected and there
is a DHW call for heat, the system pump will be turned
off (when “System Pump Run Pump for” parameter is
set for “Central Heat Optional Priority”) and the DHW
pump will be turned on. Additionally, if outdoor reset
is active, the active setpoint is adjusted to the DHW
Setpoint. Priority protection is provided to ensure central
heat supply in the case of excessively long DHW call for
heat.
8. “Setback” Setpoints
User adjustable Thermostat “Sleep” or “Away” Setback
Setpoints are provided for both Central Heat and
DHW demands. The Setback setpoint is used when the
EnviraCOM thermostat is in “leave” or “sleep” modes.
When setback is “on” the thermostat setback setpoint shifts
the reset curve to save energy while the home is in reduced
room temperature mode. The Honeywell VisionPro IAQ
(part number TH9421C1004) is a “setback” EnviraCOM
enabled thermostat.
6
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I. Operation C. Boiler Protection Features (continued)
C. Boiler Protection Features
1. 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 187°F (86°C) (maximum setting
200°F (93°C) the boiler is cycled off. If the temperature
exceeds 210°F (98.9°C), a manual reset hard lockout
results.
If the boiler is responding to the internal Multiple Boiler
Control Sequencer or an External EMS demand and
the supply water temperature increases above 190°F
(87.7°C) the control begins to reduce the blower
maximum speed setting and if the temperature increases
to 200°F (93°C) a forced recycle results. Additionally,
if the supply temperature rises faster than the degrees
Fahrenheit per second limit a soft lockout is activated.
2. High Differential Temperature Limit
The Control monitors the temperature difference
between the return and supply sensors. If this difference
exceeds 43°F (23.9°C) the control begins to reduce the
maximum blower speed. If temperature difference
exceeds 53°F (29.4°C) a forced boiler recycle results.
If the temperature difference exceeds 63°F (35°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.
3. Return Temperature Higher Than Supply
Temperature (Inversion Limit)
The Control monitors the supply and return temperature
sensors. If the return water temperature exceeds the
supply water 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 ve times the boiler manual reset Hard Lockout is
set. This condition is the result of incorrectly attaching
the supply and return piping.
4. External Limit
An external limit control can be installed on the low
voltage terminal strip. Be sure to remove the jumper
when adding an external limit control to the system. If
the external limit opens, the boiler will shut down and
an open limit indication and error code is provided. If
the limit installed is a manual reset type, it will need
to be reset before the boiler will operate.
5. Boiler Mounted Limit Devices
The control monitors individual limit devices: ow
switch, thermal fuse and sump pressure switch. 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. During the boiler start
sequence the control requires the air proving switch to
be in the “open” position before the blower starts and
in the “closed” position after the blower starts. If the
air proving switch is not in the required position the
start sequence is halted or the boiler is shut down and
the open limit indication is provided.
6. Stack High Limit
The Control monitors the ue gas temperature sensor
located in the vent connector. If the ue temperature
exceeds 194°F (90°C), the control begins to reduce
the maximum blower speed. If the ue temperature
exceeds 204°F (96°C), a forced boiler recycle results.
If the ue temperature exceeds 214°F (101°C), the
control activates a manual reset Hard Lockout.
7. Ignition Failure
The Control monitors ignition using a burner mounted
ame sensor. In the event of an ignition failure, the
control retries 5 times and then goes into soft lockout
for one hour.
8. Central Heating System Frost Protection
When enabled, Frost Protection starts the boiler and
system pump and res the boiler when low outside air
and low supply water temperatures are sensed. The
Control provides the following control action when
frost protection is enabled:
Table 2: Frost Protection
Device
Started
Boiler & System
Pump
Boiler Supply Water < 38°F (3.3°C) Supply Water > 50°F (10°C)
Outside Air < -22°F (-30C)
Supply Water < 45°F (7.2°C)
FROST PROTECTION NOTE
The Control helps provide freeze protection for the boiler
water. Boiler ue gas condensate drain is not protected from
freezing. Since the Control only controls 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.
Start
Temperatures
Stop
Temperatures
Outside Air > -18°F (-28°C)
Supply Water > 50°F (10°C)
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7
I. Operation D. Multiple Boiler Control Sequencer (continued)
D. Multiple Boiler Control Sequencer
1. “Plug & Play” Multiple Boiler Control Sequencer
When multiple boilers are installed, the Control’s
Sequencer may be used to coordinate and optimize
the operation of up to eight (8) boilers. Boilers are
connected into a “network” by simply “plugging in”
standard ethernet cables into each boiler’s “Boiler-ToBoiler Communication” RJ45 connection.
2. Sequencer Master
A single Control is parameter selected to be the Sequencer
Master. The call for heat, outdoor and header sensors,
and common pumps are wired to the Sequencer Master
“enabled” Control.
3. Lead/Slave Sequencing & Equalized Run Time
One boiler is a “Lead” boiler and the remaining networked
boilers are “Slaves”. When demand is increasing, the
Lead boiler is the rst to start and the Slave boilers are
started in sequential order (1,2,3,…) until the demand
is satised. 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.
4. Improved Availability
The following features help improve the heat availability:
a. 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 ring rate. This feature
allows continued coordinated sequencer control even
after a header sensor failure.
b. “Stand Alone” Operation Upon Sequence Master
Failure: If the Sequence Master Control is powered
down or disabled or if communication is lost
between boilers, individual boilers may be setup
to automatically resume control as a “stand alone”
boiler.
c. Slave Boiler Rate Adjustment: Each slave boiler
continues to monitor supply, return and ue gas
temperatures and modies the Sequence Master’s
ring rate demand to help avoid individual boiler
faults, minimize boiler cycling and provide heat to
the building efciently.
d. Slave Boiler Status Monitoring: The Sequence Master
monitors slave boiler lockout status and automatically
skip over disabled boilers when starting a new slave
boiler.
5. 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 rst during winter months and then selected to
run last for the remainder of the year.
8
6. 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.
7. 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, res to satisfy the DHW setpoint.
8. 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.
9. Optimized Boiler Modulation
Boiler ring rate is managed to increase smoothly as
boilers are started. For example, when a second boiler is
started the initial ring rate is 100%/2 or 50%, when the
third boiler is started the ring rate starts at 200%/3 or
66%. After the initial start, the Sequence Master develops
a unison ring rate demand based on it’s setpoint and
sensed header temperature.
10. Innovative Condensing Boiler Control
During low loads, the Sequence Master limits ring rates
to a ‘Base Load Common Rate” to ensure modulating
condensing boiler peak operating efciency. Lower ring
rates boost efciency by helping increase the amount of
ue gas water vapor condensation. The Control maintains
a “Base Load Common Rate” until the last lag boiler is
started. At this point, the “Base Load Common Rate” is
released to allow boilers to modulated as required to meet
heat load.
11. Advanced Boiler Sequencing
After there is a Call For Heat input, both header water
temperature and boiler ring 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 “Diff Above” and “Diff Below” settings. Also,
in order to minimize temperature deviations, the control
adjusts the number of boilers running based on the ring
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.
12. 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) (eld adjustable).
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X. Operation E. Boiler Sequence Of Operation (continued)
E. Multiple Boiler Control Sequencer
1. Normal Operation
Table 3: Boiler Sequence of Operation
Status Screen Display Description
<
Priority:
Standby
Status:
Standby
Priority:
Central Heat
Status:
(burner Off, circulator(s) Off)
Boiler is not ring and there is no call for heat, priority equals standby. The boiler
is ready to respond to a call for heat.
(burner Off, circulator(s) On)
Boiler is not ring. There is a Central Heat call for heat and the Supply temperature
is greater than setpoint minus the “Diff Below”.
Standby
When supply temperature drops burner demand continues with following Status
Priority:
Central Heat
Status:
Prepurge
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 10
second combustion chamber purge is conducted.
Priority:
Central Heat
Status:
Direct
ignition
i
Boiler 1
Supply
Setpoint
Rate
Priority:
Status:
132 F
140 F
100%
Central Heat
Running
Central Heat
>
Priority:
Status:
Running
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 conrmed that no ame is present
Direct Ignition: Spark and Main fuel valve are energized.
(burner On, circulator(s) On)
After ame is proven the sequence continues with run stabilization and low
re hold time. Once the eld adjustable low re hold time is completed normal
boiler operation begins, modulation rate depending on temperature and setpoint
selections.
i
<
Boiler 1
Supply
Setpoint
Rate
Priority:
Status:
132 F
180 F
100%
Domestic Hot Water
Running
105337-02 - 9/14
>
Priority:
Domestic
Hot Water
Status:
Running
Priority:
Standby
Status:
Post-purge
Priority:
Standby
Status:
Standby
Delay
Priority:
Standby
Status:
Lockout
If the Central Heat call for heat is active and a Domestic Hot Water (DHW) call for
heat received the DHW demand becomes the “priority” and the modulation rate,
setpoint, “Diff Above” and “Diff Below” are based on DHW settings.
(burner Off, circulator(s) Off)
If there is no call for heat 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 29 second combustion chamber purge is conducted.
Standby delay status is entered when a delay is needed before allowing the burner
control to be available. For example, when Anti-Short Cycle time is selected
Standby delay is entered after the Central Heat call for heat ends. Select “Help”
button from the “Home Screen” to determine the cause of the Standby Delay.
A lockout status is entered to prevent the boiler from running due to a detected
problem. Select “Help” button from the “Home Screen” to determine the cause of
the Lockout. The last 10 Lockouts are recorded in the Lockout History.
9
I. Operation E. Boiler Sequence Of Operation (continued)
2. Using The Display
The Control includes a touch screen LCD display. The user monitors and adjusts boiler operation by selecting screen
navigation “buttons” and symbols. Navigation features are shown below.
The “Home Screen” and menu selections are shown below. When no selection is made, while viewing any screen, the
display reverts to the “Home Screen” after 4 minutes. The “Home Screen” displays boiler temperature, boiler status and
Efciency Information. “Energy Save On” indication appears when the outdoor reset or setback features have lowered the
Central Heat Setpoint based on outside air temperature measurement or time of day. “Max Efciency On” appears when
the boiler return temperature has been reduced low enough to allow energy saving ue gas condensation.
Home Screen
The Home Screen Menu Buttons connect the displays four main display groups; Status, Detail,
Help and Adjustment Screens.
10
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