LAARS LLS-1 Installation Manual
Operation Instructions Document 4188A
OUT OF
PRODUCTION
Operation
Instructions
for
Laars
Logic
System
LLS-1
LCD Boiler
Controller
To be used in conjunction with appropriate product Installation and Operation manual shipped
with product.
WARNING
Improper adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or additional information, consult a qualified
installer, service agency, gas supplier, or call factory Applications Engineer.
H0243200A
Page 2
LAARS HEATING SYSTEMS
TABLE OF CONTENTS
SECTION 1
General Information
1.1 Introduction .................................................... 3
1.2 Standard Operating Features ........................ 3
1.3 Inputs ............................................................. 3
1.4 Outputs .......................................................... 3
1.5 Indications / Displays ..................................... 3
SECTION 2
Operation
2.1 Sequence of Operation .................................. 4
SECTION 3
Field Installed Connections
...................................................................... 4
SECTION 4
Factory Installed Connections
...................................................................... 7
SECTION 5
Programmable Parameters
...................................................................... 7
OUT OF
SECTION 6
Programming
...................................................................... 9
SECTION 7
Troubleshooting
7.1 Display Fault Guide .................................... 14
7.2 Flow Fault Guide ......................................... 15
7.3 Blocked Vent Fault Guide ........................... 16
7.4 Flame Rollout Fault Guide .......................... 17
7.5 Low Gas Pressure Fault Guide ................... 18
7.6 High Gas Pressure Fault Guide .................. 19
7.7 Low Water Cut Off Fault Guide................... 20
7.8 Vent Damper Fault Guide ........................... 21
SECTION 8
Replacement Parts
8.1 Ordering Information................................... 22
8.2 Parts List .................................................... 22
PRODUCTION
Laars Logic System
Page 3
SECTION 1.
General Information
1.1 Introduction
The Laars Logic System (LLS) is a solid state,
commercial control capable of interfacing with your
boiler or water heater to intelligently provide heat
energy, diagnose problems and display boiler status
via a liquid crystal display (LCD).
The LLS-1 allows you to customize your boilers
operation to best suit the needs of your application,
while providing you with useful information to
increase efficiency and simplify servicing.
The control reads information from multiple
inputs and controls multiple outputs with a total of
seventeen display readings. All sensors are monitored
in parallel for increased safety.
The control features a simple user interface that
allows programming of many functions and
parameters. All boiler / domestic water settings are
accessible through this interface as well as alarm
settings and gas valve staging. Pump options (such as
freeze protection and pump exercise) can also be
turned on or off. If the draft fan or power venter
option is used, they too can be controlled through
simple display windows.
1.2 Standard Operating Features
All safety devices and sensors are checked to be
working properly prior to starting boiler
Proven hot surface or spark ignition, pilot &
Optional outdoor air temperature reset for boiler
Alarm contacts for fault conditions
Domestic Hot Water (DHW) set-point with
Control primary boiler pump
Control DHW circulator (when Laars sensor is
Display supply water temperature
Display return water temperature and set point
Display outdoor air temperature (OAT sensor
Display DHW storage tank temperature & set-
Adjustable pump time delay
Adjustable manual reset outlet water temperature
Control boiler staging
2 amp fused relays for low voltage devices
30 amp fused relays for high voltage devices
Removable relay terminals for easy wiring
Easy to access, easy to read control box
PRODUCTION
main gas valves, flame proving, vent dampers,
power venting equipment, and combustion air
intake equipment
operating temperature
adjustable differential (when Laars sensor is used)
used)
optional)
point
locations
OUT OF
Back-lighting for all LCDs to make
programming easier in dark locations
Modes for set-up, normal operation,
programming & trouble-shooting
Components such as power venters, combustion
air intake systems, outdoor air sensors are field
configurable
Continuous display of basic operating conditions
with easy to read symbols
Adjustable fan setting for pre and post purge timing
LCD will display and diagnose boiler
performance down to the component level
Redundant processors constantly monitor all
safety devices and control operation
1.3 Inputs
1. Tank Temperature Sensor (optional Laars sensor
for DHW)
2. Inlet Water Temperature Sensor
3. Outlet Water Temperature Sensor
4. Flame Sensor
5. Low Water Cut Off (Water Level)
6. Blocked Vent Switch
7. Water Flow Sensor (Flow Switch)
8. High Gas Pressure Sensor (may be optional)
9. Low Gas Pressure Sensor (may be optional)
10. Venturi Differential Pressure Switch
(MightyMax)
11. Burner Temperature Switch (Mighty Max)
12. Fusible Links (when boiler/heater is equipped)
13. Vent Damper Open (when boiler/heater is
equipped)
14. Draft Inducer Pressure Switch (when used)
15. Auxilliary Devices
1.4 Outputs
1. Boiler Pump
2. Igniter or Pilot Igniter Control
3. Pilot Gas Valve Control
4. Gas Valve Control
5. DHW Circulator (when used with Laars sensor)
6. Vent Damper (when used)
7. Alarm
8. Draft Inducer (when used)
1.5 Indications / Displays
Inlet Water Temperature
Outlet Water Temperature
Temperature Set Points for inlet water and DHW
Ignition Process Indicators
Low Water Cut Off Status (Water Level)
Vent Damper Status
Water Flow Status
Supply Gas Pressure Status (when ordered with
gas train)
Lockout Indication and Alarm
Main Gas Valve On/Off
Page 4
LAARS HEATING SYSTEMS
Main Gas Flame Status (if main burner flame
sensor is present)
Pump / Circulator Status for Boiler and DHW
Pumps
Fan Status
Boiler Staging Status
Service Required Indicators
SECTION 2.
Operation
2.1 Sequence of Operation
1. The main power switch is ON.
2. Space heating or domestic hot water call for
heat signal is initiated.
3. The status of the water temperature at the boiler
inlet is verified.
4. The status of the water temperature at the boiler
outlet is verified.
5. Auxiliary terminals are checked to make sure the
circuit is closed.
6. Boiler pump is energized (if controlled by the
LLS).
7. Vent damper is opened (if installed)
8. Vent damper proving switch is verified.
9. Venting fans are energized (if installed).
10. Controller verifies that power venter proving
switch has been made.
11. Controller verifies that the high gas pressure
switch has not tripped if unit is equipped with
switch.
12. Proper minimum gas pressure is verified if the
unit has low gas pressure switch.
13. If used on the unit, rollout switch, blocked vent
switch and fusible links are checked.
14. Differential pressure switches to verify proper
air flow through units are checked (if the unit
has such devices).
15. Flow switch is checked.
16. Adequate water level is verified through Laars
Low water cutoff (if equipped).
17. Controller performs a pre-flame sense check.
18. Ignition system is energized.
19. Controller performs a post flame sense check.
20. The main gas valve assembly is activated as
prescribed.
21. The main burner is ignited.
22. Call for heat is satisfied.
23. Main gas valve assembly is deactivated.
24. The pump is allowed to operate for a preset time,
after which is stops (if pump delay is activated).
25. Venting fan is allowed to post purge, after which
is stops (if programmed).
26. Vent damper stays open if post purge is
activated, after which time it closes.
PRODUCTION
OUT OF
SECTION 3.
Field Installed Connections
Connections that are made to the LLS controller
are described in this section. Sensors, field-supplied
switches, power venters, aquastats, etc. can be
connected directly to the LLS control. This section
describes the method of connection, as well as any
important information regarding connections (see
Figure 1). Many connections will require
programming/setup of the controller.
The LLS-1 has several operating parameters that
can be changed to ensure that the boiler operation best
meets the needs for your application.
Laars controls boiler water temperature at
inlet.
See Sections 5 and 6 for specifics about
programming options.
Field Interlock - T1
The field interlock connection is commonly
referred to as a T-T connection. This is for tank
aquastats and heating thermostats / end switches. The
boiler will not fire unless this connection is made.
WARNING
The Field Interlock connection is NOT for safety
switches that are used to prevent the boiler from
firing. For field-supplied safety switches, connect
directly through the boiler wiring or through the
auxillary switch connection on the LLS (J32). When
components are wired through the Field Interlock,
voltage to the main gas valves can be energized by
the DHW (domestic hot water) sensor, if used.
Contact the factory if you have any questions about
how to connect safety switches to the boiler or the
LLS.
Important Note About Tank Aquastats:
Standard tank aquastats must be connected to the
Field Interlock (T1), not the DHW Tank Temp (T3).
The aquastat will call for heat when the tank
temperature drops, as in a standard water heater setup.
DHW Tank Temp connection is for the Laars DHW
Sensor only. Do not enable or program parameters for
domestic water on the LLS when using a standard
tank aquastat, or the controller will look for the
Laars DHW Sensor.
Outside Air Temp - T2
Laars OAT (outside air temperature) Sensor is
connected here when outdoor reset is used in a heating
system. To ensure proper operation, only the Laars
OAT sensor should be used with the LLS.
Laars Logic System
Page 5
OUT OF
PRODUCTION
Figure 1. Laars Logic System Connections.
DHW Tank Temp - T3
This connection is for a Laars DHW
(domestic hot water) Sensor only. (Standard tank
aquastats must be connected to T1, the Field Interlock
connection on the controller.) The Laars DHW sensor
is a thermistor, not a switch, and this connection reads
resistance. Use of this sensor allows the user to
program domestic water features that are not available
when using a standard tank aquastat.
WARNING
If DHW sensor is used, additional components that
are tied to the field interlock will NOT prevent the
unit from firing when the DHW sensor calls for heat.
For field-supplied safety switches that must keep the
boiler from firing, connect directly through the boiler
wiring or through the auxiliary switch connection on
the LLS (J32).
Page 6
LAARS HEATING SYSTEMS
Water Level Sensor - J9
This connection is for a Laars Low Water
Cutoff only. (Other low water cutoff devices must be
connected to Aux SW - J32.) This connection is
made at the factory on units that are ordered with the
Low Water Cutoff option or other options that
include a Low Water Cutoff and is made in the field
when being added after the unit is on site.
Draft Pressure Switch - T4
When a draft fan is installed, a draft pressure
switch must be connected to ensure that the fan is
operating before the boiler is allowed to fire. Some
boilers and water heaters have built-in fans, and this
connection will be made to the units internal draft
switch. Remove factory-installed jumper when
connecting draft pressure switch.
Vent Damper Control - T5
Vent dampers for units that require them
(Mighty Therm HH & PH, 175-250) are equipped
with a harness that requires wiring to the LLS
through the Vent Damper Control connection. See
Figure 2. Remove factory installed jumper when
connecting vent damper.
High & Low Gas Pressure Switches - T6
OUT OF
PRODUCTION
Figure 2. LLS Vent Damper Connection.
On pump-mounted units, this connection is
made at the factory. To interlock a pump to the LLS
for non-pump-mounted units, with the addition of
Laars high voltage (110V) relay & wire harness, use
this connection. One end of the wire harness connects
to J20 and the other end connects to the relay. A
separate 110V source is then connected through the
relay to the pump. This connection will handle
pumps as large as 1hP, 110V, single phase. The LLS
can be programmed to post-purge the pump and
monitor current draw through the relay.
DHW Pump Control - J19
This feature works with the Laars DHW
sensor only. To interlock a domestic water pump
(the pump between the heater and the storage tank) to
the LLS, with the addition of Laars high voltage
(110V) relay, wire harness, and DHW sensor, use
this connection. One end of the wire harness connects
to J19 and the other end connects to the relay. The
Laars DHW sensor must be connected to T3. A
separate 110V source is then connected through the
relay to the pump. This connection will handle
pumps as large as 1hP, 110V, single phase. The LLS
can be programmed to post-purge the pump and
monitor current draw through the relay.
Aux Sw - J32
This connection is made at the factory if
additional switches are ordered with the unit. If not,
field-supplied safety switches can be connected here.
Safety switches that must prevent the boiler from
firing must be connected here, or in series with the
boiler wiring, and NOT through the Field-Interlock
connection.
When a heater is built with high and low gas
pressure switches, this connection is made at the
factory. When adding gas pressure switches in the
field, wire them per Figure 3. Remove factoryinstalled jumper when connecting gas pressure
switches.
Main Pump Control - J20
Figure 3. High and Low Gas Pressure Switch
Connection.
Alarm Relay - J29
This is a normally open 24VAC relay
connection, and is not a dry contact. With this alarm
relay, the user will have a 24VAC source for building
automation system alarms, bells, buzzers, or any
other alarm device, 8VA maximum.
Draft Inducer Relay - J28
When a boiler or water heater has a built-in
draft fan, this connection will be made at the factory.
For field-supplied draft fans or power venters with
the addition of Laars relay, the user can make a
connection here which, upon a call for heat, will call
the fan to operate. The LLS can be programmed to
pre-purge and/or post-purge the fan. Important note:
When this connection is used, a draft pressure switch
must be installed at connection T4 to prove the fan is
operating before the unit fires.
Vent Damper Relay - J27
Laars Logic System
Page 7
Mighty Therm Boilers, models HH and PH, 175
and 250, require that vent dampers be installed. The
vent damper relay (supplied with the controller) is
plugged into this connection, but no other
connections are made to the relay. The function of
the relay is to close connections internal to the
control board.
ID Tag Port - J2
ID tag must NEVER be removed. Do not
tamper with this connection at any time.
To LCD Panel - J4
An additional LCD (controller display) can be
connected here and remote mounted up to 500 feet
away from the LLS. This is for display only. Changes
cannot be made, and the control cannot be reset from
the remote display.
SECTION 4.
Factory Installed Connections
The following connections are made at the
factory, if required, and descriptions are provided
here for informational purposes only. Some
connection points are not functional on the LLS-1,
and will not be used. Contact the factory before
modifying any of these connections. The LLS-1 has
several operating parameters that can be changed to
ensure that the boiler operation best meets the needs
for your application. See Section 5 and 6 for specifics
about programming options.
Inlet Temp Sensor - J7
temperature sensor on the boiler/heater inlet.
Outlet Temp Sensor - J8
temperature sensor on the boiler/heater outlet.
PRODUCTION
This connection is made at the factory for the
This is the factory connection for the
OUT OF
Valve Gas 2 - J18
This connection is made at the factory to
control safety gas valve or stage.
Valve Gas 1 - J17
This connection is made at the factory to
control safety gas valve or stage.
Blocked Vent Sw - J13
This is the factory connection for a unit that is
equipped with a blocked vent switch.
Venturi Sw - J16
This is the factory connection for a unit that is
equipped with a venturi pressure switch.
Roll Out Sw - J14
This connection is made at the factory on units
that are equipped with roll-out switches.
Fuse Link - J15
This is the factory connection for a unit that is
built with a fusible link.
Gas Valve 3 Relay - J26
Not used on LLS-1
Gas Valve 4 Relay - J25
Not used on LLS-1
Gas Valve 5 Relay - J24
Not used on LLS-1
Gas Valve 6 Relay - J23
Not used on LLS-1
ID Tag Port - J2
ID tag must NEVER be removed. Do not
tamper with this connection at any time.
To LCD + Keyboard - J3
This connection is made at the factory, for the
LLS display and keypad. Additional remote LCD
panel must be connected to J4.
Water Level Sensor - J9
This connection is made at the factory on units
that are ordered with the Low Water Cutoff option,
or other options that include a Low Water Cutoff.
Water Flow Sensor - J10
This connection is made at the factory, for the
water flow sensor (flow switch).
Tran Sec - J6
This is the factory connection for the units
transformer.
Gas V-5 H-Volt - J22
Not used on LLS-1
Gas V-6 H-Volt - J21
Not used on LLS-1
SECTION 5.
Programmable Parameters
See Section 6 For Programming
Instructions
The LLS-1 has several operating parameters
that can be changed to ensure that the boiler
operation best meets the needs for your application.
The following is a list of the programmable
parameters, minimum and maximum values, and
defaults. NOTE: Laars controls boiler water
temperature at inlet.
Page 8
LAARS HEATING SYSTEMS
Boiler Settings
Inlet Water Temperature
· 110°F min
· 220°F max
· 140°F default models HH/PH
· 110°F default models VW/PW
Operating Differential
· 2°F min
· 30°F max
· 15°F default models HH/PH
· 5°F default models VW/PW
Outlet Water Temperature
· 110°F min
· 240°F max
· 200°F default models HH/PH
· 180°F default models VW/PW
Low Return Water Temperature (for alarm)
· 40°F min
· 240°F max
· 80° default
Boiler Pump Settings
Boiler Pump Installed
· yes or no
· yes default for PH/PW
· no default for HH/VW
Run Constant, Auto
· auto default
· constant optional
Pump Extended Run Cycle (pump delay time)
· 0 minute min
· 10 minute max
· 5 minute default
Pump Exercise
· no default
· yes optional
Pump Exercise Frequency
· 1 day min
· 9 days max
· 7 days default
Freeze Protection
· on default
· off optional
Freeze Protection to operate at
· 33°F min
· 50°F max
· 35°F default
Domestic Hot Water (DHW) Settings
IMPORTANT NOTE: The DHW connection
on the LLS is only for the Laars DHW sensor.
Standard tank aquastats must be connected to the
LLS field interlock. These Domestic Hot Water
settings are only used if the Laars DHW sensor is
controlling tank temperature.
PRODUCTION
OUT OF
DHW Operation
· off default
· on optional
DHW Setpoint Temperature
· 110°F min
· 190°F max
· 110°F default
Operating Differential
· 2°F min
· 30°F max
· 5°F default
Outdoor Reset Settings
(Not applicable to models VW & PW)
NOTE: Outdoor Reset is accomplished with
Laars Outdoor Reset sensor. Other sensors may not
be compatible with the LLS control logic.
Outdoor Air Temperature Sensor Installed
· no default
· yes optional
Outdoor Reset
· off default
· on optional
Outdoor Reset Ratio (Boiler inlet temp set point
governs high end of curve)
·min
·5 max
· default
Maximum permissible water temperature (will
override reset curve)
· 150°F min
· 220°F max
· 190°F default
Minimum permissible water temperature (will
override reset curve)
· 110°F min
· 150°F max
· 130°F default
Warm Weather Shutdown
· on default
· off optional
Warm Weather Shutdown Temp
· 40°F min
· 120°F max
· 60°F default
Alarm Settings
External Alarm
· on default
· off optional
Internal Alarm
· on default
· off optional
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