Lochinvar Crest w/RealTime O2 Trim 100 Series User manual

Service Manual
Models: 1000 - 6000
Series: 100
This manual must only be
used by a qualified heating
installer / service technician.
Read all instructions,
including this manual and
the Crest Installation and
Operation Manual, before
installing. Perform steps in
the order given. Failure to
comply could result in severe
personal injury, death, or
substantial property damage.
⚠WARNING
Save this manual for future reference.
100343237_2000600598_Rev A
Combustion Technology
w/RealTime O2 TrimTM

2
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
⚠DANGER
⚠WARNING
⚠CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
Contents
CONTENTS....................................................................... 2
Hazard Definitions.............................................................. 2
PLEASE READ BEFORE PROCEEDING..................... 3
Handling Ceramic Fiber Materials...................................... 3
When servicing boiler ................................................... 4
Boiler operation............................................................ 4
Boiler water................................................................... 4
Freeze protection fluids ................................................ 4
WHAT IS IN THIS MANUAL............................................ 5
1. SERVICE
Boiler Piping ....................................................................... 6
SMART TOUCH w/CON•X•US Interface ........................... 7
General Operation ......................................................... 8
Control Inputs ............................................................... 9
Control Outputs........................................................... 10
Table 1A - Sequence of Operation .................................. 11
Initial Setup Screen ........................................................... 12
Viewable and Changeable Control Parameters............... 13
Set Point Screen.................................................... 13-15
Outdoor Reset Screen........................................... 16-17
Ramp Delay Screen .............................................. 18-19
BMS Screen............................................................20-22
Advanced Setup Screen.........................................23-24
Night Setback Screen..............................................25-26
Pump Screen ...........................................................27-28
Cascade Screens ....................................................29-31
Service Screen.............................................................. 32
Graph Screens.............................................................. 33
History Screens............................................................. 34
2. MAINTENANCE
Maintenance and Annual Startup................................ 35-40
3. TROUBLESHOOTING
Before Troubleshooting.................................................... 41
Check Control Module Fuses .......................................... 41
Table 3A - Troubleshooting Chart - No Display............... 42
Table 3B - 3E Checking Temperature Sensors ............... 43
Table 3F - Troubleshooting Chart - Noisy System .......... 44
Table 3G - Troubleshooting Chart - Fault Messages . 45-54
Combustion Analysis Procedure ...................................... 55
Table 3H - Flue Products ................................................. 55
Table 3I - Troubleshooting Chart - Combustion Levels . 56
Gas Valve Adjustment Procedure.................................... 57
Revision Notes .................................................. Back Cover

Service Manual
Please read before proceeding
Installer – Read all instructions, including
this manual and the Crest Installation
and Operation Manual, before installing.
Perform steps in the order given.
User – This manual is for use only by
a qualified heating installer/service
technician. Refer to the Crest User’s
Information Manual for your reference.
Have this boiler serviced/inspected by
a qualified service technician at least
annually.
Failure to comply with the above could
result in severe personal injury, death or
substantial property damage.
When calling or writing about the boiler
– Please have the boiler model and serial
number from the boiler rating plate.
Consider piping and installation when
determining boiler location (see the Crest
Installation and Operation Manual).
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by the
consignee.
3
Handling ceramic fiber materials
REMOVAL OF COMBUSTION CHAMBER LINING
The combustion chamber insulation in this appliance contains ceramic fiber material. Ceramic fibers can
be converted to cristobalite in very high temperature applications. The International Agency for Research
on Cancer (IARC) has concluded, “Crystalline silica in the form of quartz or cristobalite from occupational
sources is carcinogenic to humans (Group 1).” Normal operating temperatures in this appliance are below
the level to convert ceramic fibers to cristobalite. Abnormal operating conditions would have to be created
to convert the ceramic fibers in this appliance to cristobalite.
The ceramic fiber material used in this appliance is an irritant; when handling or replacing the ceramic
materials it is advisable that the installer follow these safety guidelines.
Avoid breathing dust and contact with skin and eyes.
• Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA
requirements for cristobalite at the time this document was written. Other types of respirators may
be needed depending on the job site conditions. Current NIOSH recommendations can be found on
the NIOSH website at http://www.cdc.gov/niosh/homepage.html. NIOSH approved respirators,
manufacturers, and phone numbers are also listed on this website.
• Wear long-sleeved, loose fitting clothing, gloves, and eye protection.
Apply enough water to the combustion chamber lining to prevent airborne dust.
Remove the combustion chamber lining from the appliance and place it in a plastic bag for disposal.
Wash potentially contaminated clothes separately from other clothing. Rinse clothes washer
thoroughly.
NIOSH stated First Aid.
Eye: Irrigate immediately.
Breathing: Fresh air.
⚠WARNING NOTICE
⚠WARNING

4
Service Manual
Please read before proceeding
When servicing boiler –
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to
the boiler.
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• Do not use this boiler if any part has been under water.
The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
Boiler water –
•Thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency
heat exchanger can be damaged by build-up or
corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Gaskets and seals in
the system may be damaged. This can result in
substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Serious damage to the boiler, personnel,
and/or property may result.
• Continual fresh make-up water will reduce boiler life.
Mineral buildup in the heat exchanger reduces heat
transfer, overheats the stainless steel heat exchanger, and
causes failure. Addition of oxygen carried in by makeup
water can cause internal corrosion. Leaks in boiler
piping must be repaired at once to prevent the
introduction of makeup water.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited
propylene glycol solutions which are specifically
formulated for hydronic systems. Ethylene glycol is
toxic and can attack gaskets and seals used in hydronic
systems.

Service Manual
5
What is in this manual?
Service
Near boiler piping
• Typical system components
The Crest boiler display
• Display panel readout, buttons and their functions
Control module inputs
• Control module inputs and options
Control module outputs
• Control module outputs and options
General
• How the boiler operates
• How the control module operates
• Access modes -- user and installer
•Sequence of operation -- DHW/space heating
Control panel menu access
• Accessing programming mode and locating menus
(See separate guide covering the PC interface.)
Control panel parameter access
• Accessing and changing parameters from the display panel
Quick start information -- parameter
table
• An index of available adjustments and readouts, where to
access them and where to find detailed information.
Crest boiler operation
• Initial Setup
• Set Points
• Outdoor Reset
• Ramp Delay
• BMS
• Advanced Setup
• SH Night Setback
• DHW Night Setback
• Cascade
• Pumps
Maintenance
• Service and maintenance schedules
• Address reported problems
• Inspect boiler area and boiler interior
• Clean condensate trap
• Check all piping for leaks
• Check air openings
• Flue vent system and air piping
• Check water system
• Check expansion tank
• Check boiler relief valve
• Inspect ignition electrode
• Check ignition ground wiring
• Check all boiler wiring
• Check control settings
• Perform start-up and checks
• Check burner flame
• Check flame signal
• Check flue gas temperature
• General maintenance
• Review with owner
• Cleaning boiler heat exchanger
• Oiled bearing circulators
• Check/replace filter
Troubleshooting
• Troubleshooting table - No display
• Checking temperature sensors
• Sensor tables
• Troubleshooting table - Fault messages displayed on
boiler interface
• Combustion analysis procedure
• Gas valve adjustment procedure

1 Service
6
Service Manual
Boiler piping
This piping reference is included to specify the Boiler Piping specific to the Crest boiler. This piping scheme is important for
proper operation of the SMART TOUCH control. See the Crest Installation and Operation Manual for more detailed piping
diagrams.
Single Boiler - Recommended - Primary / Secondary Piping with a Hot Water Generator
Single Boiler - Alternate - Full Flow System Piping
DIR #2000559501 01
INDIRECT
DHW
TANK BOILER
TP
MAKE UP
WATER
P
TO
SYSTEM
FROM
SYSTEM
MAY SUBTITUTE
LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR
MAX OF 12” APART
COLD
WATER IN
DWH HOT
WATER OUT
LEGEND
AIR SEPARATOR
CIRCULATION
PUMP FLOW CHECK VALVE
PRESSURE GAUGE
P
TEMPERATURE &
PRESSURE GAUGE
TP
SYSTEM SUPPLY
SENSOR
BACKFLOW
PREVENTER MAGNETIC SEPARATOR WATER METER
STRAINER / FILTER
PRESSURE
REDUCING VALVE
PRESSURE RELIEF
VALVE
BALL VALVE EXPANSION TANK
PIPING
DRAIN PORT
DIFFERENTIAL
PRESSURE
BYPASS VALVE
2 WAY MOTORIZED
VALVE (OPTIONAL)
MIXING VALVE
ANTI SCALD
FLOW SWITCH
OPTIONAL
WIRING
DIR #2000598465 00
MAKE UP
WATER
P
TO
SYSTEM
FROM
SYSTEM
LEGEND
AIR SEPARATOR
CIRCULATION
PUMP FLOW CHECK VALVE
PRESSURE GAUGE
P
TEMPERATURE &
PRESSURE GAUGE
TP
SYSTEM SUPPLY
SENSOR
BACKFLOW
PREVENTER MAGNETIC SEPARATOR WATER METER
STRAINER / FILTER
PRESSURE
REDUCING VALVE
PRESSURE RELIEF
VALVE
BALL VALVE EXPANSION TANK
PIPING
DRAIN PORT
DIFFERENTIAL
PRESSURE
BYPASS VALVE
2 WAY MOTORIZED
VALVE (OPTIONAL)
MIXING VALVE
ANTI SCALD
FLOW SWITCH
OPTIONAL
WIRING
BOILER
TP

Service Manual
7
1 Service (continued)
Figure 1-1 Home Screen
The Home Screen displays the available basic system information divided into the following sections: Status, Demand,
Modulation, Sensors, and Navigation.
HOME
VIEW
SETUP
INFORMATION
SETTINGS
• The Status Section is located on the top left of the screen
and displays how the unit is currently running (i.e. Off,
Stand-by, Blocking, and Lockout) including: current
driving demand, the next Hot Water Setback scheduled,
the reason for any blocking or lockout, and a power button.
• The Setpoint Demand Section is located on the bottom
left of the screen and displays information about the targets
and limits of the current demand being serviced.
• The Modulation Section is located on the top right of the
screen and displays the target modulation of the unit. This
section also includes target and actual fan speeds.
• The Boiler Sensor Section is located on the bottom right of
the screen and displays both factory installed and
field installed sensor including: Outdoor Air, Hot Water
Temperature, System Supply, System Return, Inlet Water,
Delta T, Outlet Water, Flue Temperature, and Flame
Current.
• The Navigation Section is located down the left side of the
screen. There are five (5) sections located below the
Lochinvar icon: Home, View, Setup, Information
(About), and Settings. The Home Section is the screen
shown above. The View Section provides more detailed
information including subsections for: History, Cascade,
Graphing, and a complete list of current Sensor Values.
The Setup Section has several screens to aid in setting
up the appliance. The Setup Section includes screens for
adjusting: Set Points, Pump Settings, Cascade, BMS, Ramp
Delay, and Night Setback. The Information Section
provides information about the hardware and software
including the current software version of the interface, the
version of the boiler control, and the CON·X·US device
serial number. The Setting Section enables several interface
setup features including: Time Setup, Temperature Unit
Select, Loch’n Link, System Update, and WiFi Setup.

Service Manual
8
1 Service
General Operation
How the boiler operates
The Crest uses an advanced stainless steel heat exchanger and
an electronic control module that allows fully condensing
operation. The blower pulls in air and pushes flue products
out of the boiler through the heat exchanger and flue piping.
The control modules regulate the firing rate of the boiler by
adjusting blower speeds and valve positions to maintain the
proper fuel air ratios.
How the control modules operate
The Crest boiler is equipped with a SMART TOUCH
CON•X•US Interface. The control module receives inputs
from boiler sensors and external devices. The control module
activates and controls the blowers and gas valves to regulate
heat input and switches the boiler, Hot Water Generator
(DHW), and system pumps on and off as needed. The user
programs the control module to meet system needs by adjusting
control parameters through the SMART TOUCH CON•X•US
Interface. These parameters set operating temperatures and
boiler operating modes.
Sequence of operation
Table 1A (page 11) shows control module normal
sequences of operation for space heating and DHW
operation. The combined operation sequence is for
a typical application, programmed to provide DHW
priority.
Access modes
User
The USER can set the SH set point, DHW set point, turn
the unit OFF and ON and set up WiFi.
Installer
Most parameters are available only to the INSTALLER,
accessible only by entering the installer password (5309)
when selecting the Setup Section.
Note: The password will timeout after an hour from
entry.

1 Service
9
Service Manual
1 Service (continued)
GAS PRESSURE SWITCHES
FLAME SENSOR 1 & 2
AUXILIARY LOW WATER CUTOFF
BLOCKED DRAIN SWITCH
PC INTERFACE
AIR PRESSURE SWITCH
AIR PROVING
PRESSURE SWITCH
MANUAL RESET
HIGH LIMIT
VENT DAMPER
PROVING SWITCH
HELLCAT
COMBUSTION
FEEDBACK BOARD
AIR AND GAS DAMPER MOTORS
O2 SENSOR
COMFORT
CONTROL BOARD
O2 SENSOR BOARD
BAS BOARD
HWG THERMOSTAT /
SENSOR
ENABLING DEVICE
SYSTEM SENSOR -
SUPPLY
OUTDOOR SENSOR
SEQUENCER / BUILDING
MANAGEMENT SYSTEM
LOUVER PROVING SWITCH
SYSTEM SENSOR -
RETURN
AUX SWITCH 1 & 2
0-10 INPUT FROM
SYSTEM PUMP
CASCADE
FLOW SWITCH
INLET AIR SENSOR
SMART CONTROL MODULE
DISPLAY PANEL
Control inputs

1 Service
Service Manual
10
1 Service
SMART CONTROL MODULE
VENT DAMPER
IGNITOR
GAS VALVES
COMBUSTION
FEEDBACK BOARD
AIR AND GAS DAMPER MOTORS
COMFORT
CONTROL BOARD
BAS BOARD
0-10V OUTPUT TO
BOILER PUMP
ALARM CONTACTS
SEQUENCER / BUILDING
MANAGEMENT SYSTEM
RUN TIME CONTACTS
LOUVER RELAY
BOILER RATE OUTPUT
PUMP RELAY BOARD
BOILER PUMP
CONTACTOR
SYSTEM PUMP
CONTACTOR
HWG PUMP
CONTACTOR
DISPLAY PANEL
PC INTERFACE
BLOWER
Control outputs

11
Service Manual
Table 1A Sequence of Operation
1 Service (continued)
Sequence of operation
1. Upon a call for heat, the louver relay output will be closed initiating a block that will clear when the louver proving
switch closes. Upon resolution of all blockings, the comfort control will send the demand to the boiler control.
2.
The boiler control initiates a pre-purge and confirms that all safeties are in their correct state. During the first part of
the pre-purge, the air damper is wide open. The air damper APS is checked to be open. The proof of closure input
is checked to be closed during this time.
3.
Once the air damper APS and proof of closure are confirmed, the safeties are checked in the correct state and the
free air calibration is completed, the boiler control progresses to the second part of pre-purge. During this phase, the
dampers and fan are controlled for the ignition state. During this phase, the air damper APS must become closed.
4.
The boiler control then proceeds to trial for ignition. First, the control begins sparking, then opens the gas valve.
After sparking is complete, the control checks for the presence of a flame. If the flame is not detected, the control will
recycle or lockout on an Ignition Flame Failure. If the flame is present, the control proceeds to the flame stabilization
period. During the flame stabilization period, the flame signal must not drop below the detection threshold and
further must raise to a sufficiently high level for a stable flame. If the flame does not reach the higher threshold during
flame stabilization, the unit will recycle or lockout on Flame Loss While Running. During the flame stabilization
period and any running state thereafter, the controls will check that the proof of closure input is open.
5.
Upon successful completion of the flame stabilization period, the control will proceed to the running state, and
attempt to operate at the required modulation. At all times during operation, the damper positions and fan speed
must remain within tolerance. Further, if an O2 sensor is present and functioning properly, the unit must operate
within an expected range of O2. For operation below 10% modulation, the control will check that the air damper
APS is in the closed state.
6.
If the current call for heat is for space heating and a DHW call for heat becomes active, the control will turn on the
DHW pump relay output, then turn off the boiler pump. The control will then adjust modulation to maintain the
outlet temperature to the desired DHW outlet setpoint temperature.
7. The boiler will modulate as needed to reach the desired set point.
8. Once both the space heating and DHW calls for heat are satisfied, the control will turn off the gas valve and begin the
post-purge cycle. Any pumps that are running will begin their respective pump delay cycles.
9. At the end of the post-purge cycle, the louver relay contacts will de-energize.
10.
After the fan speed falls below 3000 rpm, the air damper will be closed. The controls will check that the blower stops
running and dampers are in their expected positions. The control will check that the air damper APS reaches the
open state.
11. After one (1) minute in standby, the O2 sensor will go into a standby state. At the end of the pump delay cycle(s),
the pump(s) will be turned off.

Service Manual
12
Initial Setup Screen
Figure 1-2 Settings Screen
Initial Setup
Clock and Date
The control uses an internal clock for the night setback
feature and for logging of events. For these features to
work correctly, the clock must be set when the boiler is first
installed or anytime the boiler has been powered off for more
than four (4) hours. This parameter must be accessed to set
the clock. If the unit is connected to the internet, the time will
adjust based on the time zone selected.
Temperature units (°C / °F)
The control can be configured to display temperature in
either °C or °F.
1 Service

13
Service Manual
1 Service (continued)
Viewable and changeable control parameters
CAUTION Before changing parameters, note the settings so that the unit can be returned to its original operating
parameters.
Figure 1-3 Set points DHW_Screen A
Figure 1-4 Set points DHW_Screen B
Set Point Screens

14
Service Manual
Figure 1-5 Set points SH_Screen A
1 Service
Menu Parameter Name
(as shown on the LCD screen)
Min Max Default
Value Value Value
Space Heat 1 Set point: Set point 32 185 120
Space Heat 1 Set point: Min 32 185 32
Space Heat 1 Set point: Max 32 185 185
Space Heat 1 Set point: Offset 0 36 10
Space Heat 1 Set point: Diff 0 72 20
System Pump Anti-Seize Time 0 21 20
High Limit: ARHL 32 200 199
High Limit: MRHL 32 205 205
DHW Boiler Set point: Set point 32 185 180
DHW Boiler Set point: Offset 0 36 10
DHW Boiler Set point: Differential 0 10 20
DHW Tank Set pont: Set point 32 185 120
DHW Tank Set point: Min 40 185 100
DHW Tank Set point: Max 40 185 130
DHW Tank Set point: Diff 0 10 5
SET POINTS
Table 1B Set Points (This table lists control module parameters; use the sub-tab under the Setup tab to access
them.

Service Manual
15
1 Service (continued)
Set Points
Space Heat 1 Set Point: Set point
The SH set point sets the water temperature set point used
during space heating calls.
Space Heat 1 Set Point: Min
The SH minimum set point determines the minimum
value to which a user can adjust the Space Heat 1 set
point without using the installer password. Note that with
Outdoor Reset, BMS, and other control modes, the actual
Space Heat set point can go below this value.
Space Heat 1 Set Point: Max
The SH maximum set point determines the maximum
value to which a user can adjust the Space Heat 1 Set Point
without using the installer password. Note that there are
scenarios when a boiler outlet temperature or even active
set point can exceed this value.
Space Heat 1 Set Point: Offset
The SH offset sets how many degrees above set point the
temperature can go before the boiler will shut off.
Space Heat 1 Set Point: Differential
The SH differential sets how many degrees below the
offset the temperature has to drop before the boiler turns
back on.
High Limit: ARHL
The SMART TOUCH control contains an integral Auto
Reset High Limit (ARHL) on the outlet of the heat
exchanger. Once the outlet temperature exceeds the
ARHL set point, the boiler will shut down and lock out.
Once the outlet temperature has dropped below this
set point, the RESET button on the LCD display can be
pressed to reset this lockout. If RESET is not pressed,
the control will attempt to automatically reset the lockout
after 15 minutes.
High Limit: MRHL
The SMART TOUCH control contains an integral Manual
Reset High Limit (MRHL) on the outlet of the heat exchanger.
Once the outlet temperature exceeds the MRHL set point, the
boiler will shut down and lock out. Once the outlet temperature
has dropped below this set point, the RESET button on the
LCD display must be pressed to clear this lockout.
DHW Boiler Set Point: Set point
When a DHW call for heat becomes active, the control will
use the DHW boiler set point to determine the firing rate of
the boiler based on the boiler outlet water temperature or the
system supply sensor depending on the DHW configuration
(Normal or Zone).
DHW Boiler Set Point: Offset
This parameter reflects the degrees above DHW boiler set point
the outlet temperature can go before the boiler will shut off.
DHW Boiler Set Point: Differential
This parameter reflects the degrees below DHW boiler offset
the outlet temperature has to go before the boiler turns on.
DHW Tank Set Point: Set Point
By installing a tank sensor, the SMART TOUCH control can
perform the tank thermostat function. The SMART TOUCH
control automatically detects the presence of this sensor, and
generates a call for heat when the tank temperature drops
below the tank set point minus the differential, and finishes the
call for heat when the tank temperature reaches tank set point.
DHW Tank Set Point: Min
This setting controls the minimum user set point for the tank
temperature.
DHW Tank Set Point: Max
This setting controls the maximum user set point for the tank
temperature.
DHW Tank Set Point: Differential
When a tank sensor is installed, the tank temperature must
drop this amount below the tank set point before the boiler
will turn on.
NOTICE The SH maximum set point does not
serve as a functional operating limit
to the appliance. This setting only
limits what adjustment a user can
make without the installer password.
If a certain application requires a
hard limit on water temperature, the
ARHL or MRHL features should be
used.
NOTICE DHW Tank Set Point: Min setting
does not constitute a minimum possible
temperature of the tank, but rather a
minimum allowable value of the DHW
Tank Set Point that can be applied
without the installer password.
The DHW Tank Set Point: Max setting
does not constitute a maximum possible
temperature of the DHW tank. Proper
scald protection is required regardless of
the value of this setting.
⚠CAUTION

Service Manual
16
1 Service
Outdoor Reset Screen
Figure 1-6A Outdoor Reset A
Figure 1-6B Outdoor Reset B

Service Manual
17
1 Service (continued)
Outdoor Reset
Outdoor Reset Curve
The Outdoor Temp Min and Set Point Max define the
upper point of the Outdoor Reset Curve. The lower point
is defined by the Outdoor Temp Max and Set Point Min.
The curve will level out at Set Point Min for temperature
warmer than Outdoor Temp Max. The Space Heat 1 Set
Point (User Set Point) will serve as the maximum set point
generated by the Outdoor Reset, regardless if this value
is higher or lower than Set Point Max. The curve will
continue increasing set point above Set Point Max as the
outdoor temperature falls lower than the Outdoor Temp
Min if the User Set Point is higher than the Set Point Max.
The curve will be shortened such that the outdoor reset
set point will not reach Set Point Max in case the User Set
Point is below Set Point Max. In this case, the maximum
set point will be achieved at some outdoor temperature
higher than Outdoor Temp Min.
Outdoor Temperature: Shutdown
When the outdoor temperature rises above this point, the
control will block all SH demands (DHW demands will still
be active).
Outdoor Temperature: Differential
The outdoor temperature differential parameter is the number
of degrees the outside air temperature must fall below the
outdoor shutdown parameter setting before the boiler will
respond to a SH demand.
Shift OA Reset Curve
The shift reset curve parameter shifts the actual set point above
or below the calculated set point by the number of degrees in
this parameter.
Boost Time
The boost time parameter sets the amount of time that must
elapse with a SH demand before the water temperature
calculated set point will be increased.
Boost Temperature
If a SH demand lasts longer than the programmed boost
time delay setting and there have been no DHW demands,
the control will increase the water temperature set point by
the amount in this parameter. If the SH demand continues
through another time period, the set point will be increased
again. This will continue until either the SH demand ends,
a maximum of 20 increases has occurred, or the maximum
set point has been reached. Once the SH demand has been
satisfied the set point will revert back to its calculated setting.
Menu Parameter Name
(as shown on the LCD screen)
Min Max Default
Value Value Value
Set point: Cold Day 32 185 180
Set point: Warm Day 32 185 110
Outdoor Temperature: Cold Day -22 120 25
Outdoor Temperature: Warm Day -22 120 70
Outdoor Temp: Shutdown 32 122 80
Outdoor Temp: Diff 0 48 10
Shift OA Reset Curve -27 27 0
Boost Time 0 250 0
Boost Temperature 0 30 0
Table 1C Outdoor Reset (This table lists control module parameters; use the sub-tab under the Setup tab to access
them.)
OUTDOOR RESET

Service Manual
18
1 Service
Ramp Delay Screen
Figure 1-7A Ramp Delay
Figure 1-7B Ramp Delay

Service Manual
19
1 Service (continued)
Ramp Delay
Ramp Delay (Enable / Disable)
This parameter allows the installer to enable or disable the
SH ramp delay.
SH Ramp Delay
The SMART TOUCH CON•X•US Interface can be
programmed to limit the target firing rate for a fixed period
of time at the start of a space heating demand. There are six
(6) possible limits, each with their own time delay. The first
limit applies as soon as the burner starts. Once its time delay
expires, the second limit is applied and its timer begins. The
control steps through these limits until the 6th (sixth) limit
expires, at which point SH Ramp Delay will no longer limit
modulation.
Boiler Rate (%)
Thisparametersettingwilldefinetheminimumandmaximum
modulation of the boiler during normal operation. Boiler
rate settings can be useful to limit high fire rate to increase
the run times to reduce short cycling or to limit turndown
for sites having minimum requirements for processing
temperatures. Note: When commissioning or servicing the
boiler, the minimum and maximum rate settings need to be
set to their lowest and highest settings, respectively. This
ensure the boiler has the full range of operation needed for
commissioning and servicing the boiler.
Menu Parameter Name
(as shown on the LCD screen)
Min Max Default
Value Value Value
Ramp Delay Mode N/A N/A N/A
Step 1: Ramp Delay Time 0 40 2
Step 1: Ramp Delay Limit (%) LF 100 15
Step 2: Ramp Delay Time 0 40 1
Step 2: Ramp Delay Limit (%) LF 100 30
Step 3: Ramp Delay Time 0 40 1
Step 3: Ramp Delay Limit (%) LF 100 45
Step 4: Ramp Delay Time 0 40 1
Step 4: Ramp Delay Limit (%) LF 100 60
Step 5: Ramp Delay Time 0 40 1
Step 5: Ramp Delay Limit (%) LF 100 75
Step 6: Ramp Delay Time 0 40 1
Step 6: Ramp Delay Limit (%) LF 100 100
Table 1D Ramp Delay (This table lists control module parameters; use the sub-tab under the Setup tab to access
them.)
RAMP DELAY
SH Boiler Rate (%)
This parameter setting will define the minimum and maximum
modulation for space heat demand.
DHW Fan Rate (%)
This parameter setting will set the minimum and maximum
fan rates during hot water demands.
Note: Ramp Delay, Boiler Rate, SH Boiler Rate, or DHW
Fan Rate, all serve to limit the minimum and maximum rate
percentage settings, but they do not have assigned priorities.
The overall modulation rate is determined by mode (SH /
DHW / Ramp Delay / BMS / etc.,), system setpoint(s), and
boiler rate min/max limits in conjunction with the current
operating conditions which could require a higher modulation
rate to boost a weak flame signal or a lower modulation to
reduce temperatures to avoid tripping the Manual Reset High
Limit (MRHL).

Service Manual
20
1 Service
BMS Screens
Figure 1-8 BMS_Screen A
Figure 1-9 BMS_Screen B