Slant/Fin CHS-85 User manual

MODELS CHS-85 t roug CHS-399
– APPENDIX A –
CONTROLLER AND DISPLAY INSTRUCTIONS
IMPORTANT
READ ALL OF THE FOLLOWING WARNINGS AND STATEMENT
SYMBOLS AND DEFINITIONS BEFORE READING THE
INSTALLATION INSTRUCTIONS
This manual must be left
with owner and should be
hung on or adjacent to the
boiler for reference.
®
C US
HIGH EFFICIENCY FIRETUBE
CONDENSING GAS BOILER
©Slant/Fin Corp. 2013 • 813 • PUBLICATION CHS-CD-40
!
DANGER
Dange Sign: Indicates a haza dous situation which,
if not avoided, will esult in se ious inju y o death.
Wa ning Sign: Indicates a haza dous situation which,
if not avoided, could esult in se ious inju y o death.
Caution Sign plus Safety Ale t Symbol: Indicates a haza dous situa-
tion which, if not avoided, could esult in mino o mode ate inju y.
Caution Sign without Safety Ale t Symbol: Indicates a haza dous
situation which, if not avoided, could esult in p ope ty damage.
Notice Sign: Indicates a haza dous situation which, if
not avoided, could esult in p ope ty damage.
This Boile must be installed by a licensed and t ained Heating Techni-
cian o the Wa anty is Void. Failu e to p ope ly install thisunit may e-
sult in p ope ty damage, se ious inju y to occupants, o possibly death.
!
WARNING
!
CAUTION
CAUTION
NOTICE
!
WARNING

Table of Contents
1.0 INTRODUCTION ...........................................................................................................................1
1.1 Clearing a Lockout....................................................................................................................1
1.2 Keypad.......................................................................................................................................1
1.3 Home Screen .............................................................................................................................2
2.0 I-INFORMATION SCREEN (MAIN MENU)................................................................................4
2.1 Quick Start.................................................................................................................................5
2.2 Login .........................................................................................................................................6
2.3 Test............................................................................................................................................6
2.3.1 Forced Rate...................................................................................................................7
2.3.2 Manual Burner and Pump Operation............................................................................8
2.4 Advanced Setup.........................................................................................................................9
2.4.1 CH Config ..................................................................................................................10
2.4.1.1 CH Config –CH Config.............................................................................10
2.4.1.2 CH Config - Outdoor Reset Config ............................................................12
2.4.1.3 CH Config - Warm Weather Shutdown......................................................13
2.4.2 DHW Config ..............................................................................................................14
2.4.3 Lead Lag Config.........................................................................................................15
2.4.3.1 Lead Lag Master Config.............................................................................16
2.4.3.2 Use of 4-20mA Input..................................................................................17
2.4.3.3 Lead Lag Slave Config ...............................................................................18
2.4.3.4 Lead Lag Outdoor Reset.............................................................................19
2.4.4 System Config............................................................................................................20
2.4.4.1 System ID & Access...................................................................................20
2.4.4.2 Pump Config...............................................................................................22
2.4.4.3 Statistics Config..........................................................................................23
2.4.4.4 High & Stack Limits...................................................................................24
2.4.4.5 System Config.............................................................................................25
2.4.5 Modulation Config.....................................................................................................26
2.4.6 Delta T & T-rise Limits..............................................................................................27
2.4.7 Frost Protection Config ..............................................................................................28
2.4.8 Burner Control Ignition and Timings & Rates...........................................................29
2.5 Diagnostics..............................................................................................................................30
2.5.1 History........................................................................................................................31
2.6 Display Setup ..........................................................................................................................32

CHS Series Controller and Display │Slant Fin Corp.
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1.0 INTRODUCTION
The Controller and Display, together, form the control system of the Slant/Fin CHS boiler. All control
configuration parameters are stored in non-volatile memory in the CHS controller. Access to controller status
and configuration is achieved with the display. Interaction with the display is performed by physically touching
the buttons on the display keypad. Communication between the CHS controller and display is via EIA-485
interface using the Modbus RTU protocol.
When the appliance is powered there is a brief interval while the display retrieves data from the boiler control.
The display then shows the Home Screen (Summary screen) similar to the one depicted in Figure 1-2. The Home
Screen provides a summary of the overall operational status of the boiler. A series of menus, entered by pressing
the “i-Information” button, provide access to all boiler configuration parameters, information and diagnostics.
1.1 Clearing a Lockout
Figure 1-1 Clearing a Lockout
Clearing a Lockout –Any of the following methods
can be used to clear a Lockout:
1. Display - Clear the lockout from the display Home
Screen; press “OK” button on the keypad (see
Figure 1-2).
2. Controller - Clear the lockout by pressing the
RESET button situated on the boiler controller near
the indicator lights (see Figure 1-1).
3. Switch - Cycle power to the boiler using the power
on/off switch situated on the display console.
1.2 Keypad
See Figure 1-2 and Table 1-1 for a complete description of the functions of each keypad button.
Directional Arrow Buttons –are used to quickly navigate through the menu structures and within each
individual screen.
OK Button –Confirms/enters an item selection.
Back Button –returns the user to the previous screen.
i-Information Button –accesses the Main Menu where all control settings, diagnostics, etc are accessed
via a series of sub-menus.
Home Button –immediately returns the display to the Home Screen.
Reset Button

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1.3 Home Screen
The Home Screen is displayed following initial power-up and can be displayed at anytime by simply pressing the
“Home” button. The Home Screen provides a summary of the current boiler status, most recent Alert or Lockout,
and readings from chosen boiler sensors. Figure 1-2 below, identifies each Home Screen and keypad item; Table
1-1 describes them.
Figure 1-2 Home Screen & Key Pad Identification
From the Home Screen the display offers easy access to diagnostic screens through the use of the horizontal
directional buttons (◄ ►) on the display keypad. Pressing either of the horizontal buttons advances you through
the Analog Sensor I/O (inputs/outputs), Digital I/O, and then back to the Home Screen.
Figure 1-3 Diagnostic Screens
Analog Sensors I/O
Digital I/O
Outlet temp
Inlet temp
Delta T
DHW temp
Stack temp
Outdoor temp
Fan speed
Flame signal
Firing rate
4-20mA input
System sensor
70 oF
70 oF
1 oF
OPEN
71 oF
OPEN
LOW
0.00 A
0 RPM
OPEN
Outlet
Boiler pump (B)
CH pump (C)
DHW pump (A)
Blower/HSI
Eternal ignition
Pilot valve
Main valve
Alarm
Interlock (ILK)
Pre-ignit interlock (PTI)
Load control input (LCI)
STAT (Demand)
Time Of Day
Safety relay
off
off
off
off
off
off
off
off
on
off
off
off
off
off
7
1
2
3
6
4
5
9
8
10
11
12
13

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Table 1-1 Home Screen & Key Pad Description (Reference Figure 1-2)
Item
Name
Description
1
Back button
Returns the display to the previous screen in the menu structure.
2
i-Information button
Displays the Main Menu screen, where all control settings, diagnostics, etc are accessed
via a series of sub-menus.
3
Home button
Returns the display to the Home Screen (screen illustrated in Figure 1-2).
4
Directional buttons
(horizontal)
Left and right buttons (◄ ►) allow navigation within some display screens. Also
provide access, via the Home Screen, to controller input and output diagnostic screens.
5
OK button
Used to select highlighted display items, necessary for confirming settings.
6
Direction buttons
(vertical)
Up and down buttons (▲ ▼) allow navigation within display screens.
7
Boiler summary
Provides the status of five (5) boiler readings (i.e. sensor inputs or boiler operating
conditions). From a list of 15 readings, the user can select which 5 will be displayed
/summarized on the Home Screen, see Section 2.6 Display Setup
8
Boiler name
Provides the name of the boiler, i.e. 110MBH; user can choose to change the name, see
Section 2.4.4.1 System ID & Access.
9
State
Indicates the current state of burner operation:
Initiate
Standby delay
Standby
Safe startup
Prepurge - Measured purge time
Prepurge - Drive to lightoff rate
Pre ignition test
Direct Burner ignition
Run
Postpurge
Lockout
10
Demand
Indicates the current heat demand source:
OFF (no heat demand)
CH (Central Heat demand –CH1)
LL [ Lead Lag heat demand –CH2 (LL)
DHW (Domestic Hot Water demand)
CH frost protection
DHW frost protection
LL frost protection
11
Access Status
Indicates the present level of access:
User (indicates that no password has been entered –adjustment of certain settings
will be blocked.
Installer (indicates that the installer password, “sola” has been entered, allowing
adjustment of all field adjustable parameters).
12
Lockout/alert/hold
Indicates the most recent Alert, or a current Hold or Lockout.
13
Clear
When selected, clears the most recent Alert from the Home Screen; also resets and clears
a current Lockout.

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2.0 i-Information Screen (Main Menu)
Figure 2-1 i-Information Screen
i-Information –Main Menu screen, accessed
by pressing the “i” button, lists the major sub-
menus. Use the arrow buttons to navigate the
menu options; when the desired option is
highlighted it will appear at the top of the
screen (i.e. Quick Start in the example right);
select by pressing the “OK” button.
Table 2-1 i-Information Screen Menu Options
Menu Item
Description
Reference
Quick Start
Provides a summary of the most common settings for installer adjustment.
Section 2.1
Login
Provides access to a keypad for entry of the installer password –many
parameters are installer level password protected.
Section 2.2
Test
Allows the installer to test specific firing rates and pump operation manually.
Section 2.3
Advanced Setup
Provides access to all parameter settings (including those in Quick Start), for
more advanced settings.
Section 2.4
Diagnostics
Lists the status of all controller inputs and outputs (i.e. sensors and switches);
also provides access to a history of Alerts and Lockouts.
Section 2.5
Display Setup
Allows the installer to set what information (i.e. sensor status) is displayed on the
Home Screen.
Section 2.6
Quick
Start
Test
Diagnostics
Login
Advanced
Setup
Display
Setup
Quick Start

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2.1 Quick Start Figure 2-2 Quick Start Screen
Quick Start –screen, accessed by selecting
“Quick Start” from the “i-Information” screen,
provides a summary of the most common settings
that will need to be adjusted (or considered) when
initially setting up the boiler. Use the up and down
(▲▼) buttons to navigate the menu options; when
the desired option is highlighted select by pressing
the “OK” button.
Each of the parameters under Quick Start are also
listed under separate setting groups under
“Advanced Setup”; where more advanced settings
can be accessed..
Table 2-2 Quick Start Configuration Parameters
Parameter
Description
Factory Setting
CH setpoint
Setpoint value for CH modulation. If “Outdoor reset”is set to “Disable”, this is
the target temperature at the “Modulation sensor”. If “Outdoor reset”is set to
“Enable”, this is the maximum target temperature at the “Modulation sensor”
(Setpoint for CHI heat input).
180ºF
DHW setpoint
Boiler setpoint for DHW modulation. Range 60°F to 190°F
180ºF
Outdoor reset
Enables or disables CH outdoor reset function for CH1 heat inputs.
Enable
Low water temp
Minimum boiler setpoint; occurs when the outdoor temperature is equal to or
greater than the “Max outdoor temp”. Range 60°F to 140°F
95ºF
Max outdoor temp
Outdoor temperature that corresponds to the “Low water temp” setting.
Example: If the “Low water temp” setting is 95°F, and the “Max outdoor
temp” setting is 70°F, the boiler setpoint will be 95°F when the outdoor
temperature is 70°F or higher. Range 50°F to 95°F
70ºF
Min outdoor temp
Design Temperature - Outdoor temperature that corresponds to the “CH
setpoint” setting. Example: If the “CH setpoint” is 180°F, and the “Min
outdoor temp” setting is 0°F, the boiler setpoint will be 180°F when the
outdoor temperature is 0°F or lower. Range -40°F to 40°F
0ºF
Adjustable high
limit
Outlet water temperature high limit. Controller will not permit burner
operation above this setting. Recommend leaving configured as 200ºF. Range
100°F to 200°F
200ºF
Adjustable stack
limit
Stack exhaust gas high limit. Controller will lockout if exhaust gas
temperature exceeds this setting. Range 145°F to 220°F
220ºF
CH setpoint
DHW setpoint
Outdoor reset
Low water temp
Max outdoor temp
Min outdoor temp
Adjustable high limit
Adjustable stack limit
180 oF
180 oF
Enable
95 oF
70 oF
0 oF
200 oF
220 oF
Quick Start

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2.2 Login Figure 2-3 Login Screen
Login -Parameters that are password protected
require an installer to enter the password before they
can be changed. A message indicating this may
appear when a password protected parameter is
selected. To enter the password, touch the “i-
Information” button and select Login to access the
keyboard screen.
Use the horizontal and vertical directional buttons
(▼▲◄►) on the keypad to navigate the keyboard
screen. Once the desired letter or number is
selected/highlighted, press the round “OK”button on
the keypad to confirm selection.
Once the password is filled in, select/highlight “OK”
on the keyboard, and press the round OK button on
the keypad to confirm selection.
Password - Many of the configuration parameters are password protected. The required
case-sensitive password is "sola" and must be entered in lower-case letters.
2.3 Test
Figure 2-4 Test Screen Menu
Test –menu screen, accessed by selecting “Test”
from the “i-Information” screen, lists the three test
screen options. Use the up and down (▲▼) buttons
to navigate the menu options; when the desired option
is highlighted select by pressing the “OK” button.
1
2
3
4
5
6
7
8
9
0
-
=
q
w
e
r
t
y
u
i
o
p
[
]
a
s
d
f
g
h
j
k
l
;
'
z
x
c
v
b
n
m
,
.
/
Shift
BS
OK
Password
sola
Forced Rate
Manual Burner Operation
Manual Pump Operation
Test

CHS Series Controller and Display │Slant Fin Corp.
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2.3.1 Forced Rate
Figure 2-5 Forced Rate Test Screen
Forced Rate –test screen, permits the installer to
force the burner to operate at “high fire” or “low fire”
for the purpose of combustion setup and diagnoses.
Set the “Manual firing rate” to high or low fire by
using the up and down (▲▼) buttons to highlight
either “Set high fire” or “Set low fire”; then select it
by pressing the “OK” button.
When the test is complete, select “Stop test” to return
firing rate control to automatic.
The burner MUST be firing
to initiate “Start test”.
Table 2-3 Forced Rate Parameters
Parameter
Description
Set high fire *
When selected, sets “Manual firing rate” setting equal to the maximum modulation rate of the boiler.
Set low fire *
When selected, sets “Manual firing rate” setting equal to the minimum modulation rate of the boiler.
Start test *
When selected, initiates the forced rate test, burner will operate at the “Manual firing rate” setting
indicated on the screen. To stop test select “Stop test”; which will be displayed in place of “Start test”
once the test is initiated.
* = Password protected
State
Firing rate
Fan speed
Outlet temp
Manual firing rate
Test State: Idle
Test Timer: 0 sec
Set high fire
Set low fire
Start test
Standby
0 RPM
Low
71 oF
1625 RPM
Forced Rate
Burner must be in run state

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2.3.2 Manual Burner and Pump Operation
Figure 2-6 Manual Burner and Pump Operation Test Screens
Manual Burner Operation –test screen, allows the installer to manually control the firing rate of the burner.
Using the up and down (▲▼) buttons to highlight the menu options, and the “OK” button to select them, set
“Firing rate control” to “Manual”, then adjust “Manual firing rate” to the desired value.
Manual Pump Operation –test screen, allows the installer to manually turn the individual pumps on. Using the
up and down (▲▼) buttons to highlight the menu options, and the “OK” button to select them, set the desired
“Pump Control” to “On”.
The burner MUST be firing to initiate Manual Burner Operation.
Setting “Burner switch” to “Off” will inhibit burner operation, regardless of the operating
conditions.
When the test is complete, return the settings to “Auto” to allow the control to
automatically turn the circulators off and on and modulate the burner firing rate as needed.
Table 2-4 Manual Burner Operation Parameters
Parameter
Description
Default
Burner
Switch *
Allows the installer to manually switch the burner off and on.
On
Manual
firing rate *
Establishes the burner firing rate (blower RPM) when “Firing rate control” is set to
“Manual in Run” or “Manual in Run & Standby”. Feature may be useful as a diagnostic
tool; i.e. to test burner operating characteristic at a specific firing rate.
N/A
Firing rate
control *
Establishes the firing rate control of the boiler:
Auto (firing rate –blower RPM is controlled by the boiler control)
Manual in Run (blower RPM is set to the “Manual firing rate” setting; only when
burner is running).
Manual in Run & Standby (blower RPM is set to the “Manual firing rate” setting).
Auto
* = Password protected
Burner switch
Manual firing rate
Firing rate control
Off
1625 RPM
Auto
Manual Burner Operation
CH Pump Control
DHW Pump Control
Boiler Pump Control
Auto
Auto
Auto
Manual Pump Operation

CHS Series Controller and Display │Slant Fin Corp.
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2.4 Advanced Setup
Figure 2-7 Advanced Setup (Menu) Screen
Advanced Setup –menu screen, accessed by
selecting “Advanced Setup” from the “i-Information”
screen, lists all of the configuration parameter groups.
Use the up and down (▲▼) buttons to navigate the
menu options; when the desired option is highlighted
select by pressing the “OK” button.
Login –adjustment of many of the advanced settings
will prompt the user to login.
Table 2-5 Advanced Setup Menu Options
Name
Description
Reference:
CH Config
Edit Central Heat settings; CH1 heat input.
Section 2.4.1
DHW Config
Edit Domestic Hot Water settings.
Section 2.4.2
Lead Lag Config
Edit Lead-Lag Master and Slave settings; CH2 (LL) heat input.
Section 2.4.3
System Config
Edit temperature units, anti-short-cycle time, alarm silence time.
Section 2.4.4
Modulation Config
Edit burner modulation settings.
Section 2.4.5
Delta T Limits
Edit delay time for delta-t limit.
Section 2.4.6
T-rise Limits
Edit delay time for T-rise limit.
Section 2.4.6
Frost Protection Config
Enable/disable CH, DHW and LL frost protection
Section 2.4.7
Burner Timings & Rates
Read only, for information only.
Section 2.4.8
Burner Control Ignition
Read only, for information only.
Section 2.4.9
CH Config
DHW Config
Lead Lag Config
System Config
Modulation Config
Delta T Limits
T-rise Limits
Frost Protection Config
Burner Control Timings & Rates
Burner Control Ignition
Advanced Setup

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2.4.1 CH Config
Figure 2-8 Central Heat Configuration Main Menu Screen
CH Config –main menu screen, accessed by
selecting “CH Config” from the “Advanced Setup”
screen, lists the sub-menus specific to the Central Heat
Configuration. Use the up and down (▲▼) buttons to
navigate the menu options; when the desired option is
highlighted select by pressing the “OK” button.
The settings under “CH Config” are specific to boiler
operation given a local central heat demand, i.e. CH1
heat input.
2.4.1.1 CH Config –CH Config
Figure 2-9 Central Heat Configuration Sub-menu Screen
CH Config –sub-menu screen, allows the installer to
set parameters specific to the boiler response and
operation for local (i.e. non Lead Lag) Central Heat
demands. Use the up and down (▲▼) buttons to
navigate the menu options; when the desired option is
highlighted select by pressing the “OK” button.
Demand switch - Central heat demand can be
initiated by a contact closure to CH1, “LCI”, or by
boiler temperature, “Sensor only”.
Setpoint source –The boiler setpoint can be “Local”,
i.e. the “CH setpoint” set from the display, or “4-
20mA” set from an external source.
Modulation sensor –With the “Setpoint source” set
to “Local”, the control can be set to use either the
“Outlet”, “Inlet” or “S10” (pipe) sensor for regulation
of burner modulation.
Mod rate source –The burner modulation can either
be controlled by the boiler control, “Local”, or by an
external source, “4-20mA”.
Demand switch
Setpoint source
CH setpoint
Off hystersis
On hysteresis
Modulation sensor
Mod rate source
CH Config
LCI
Local
180 oF
10 oF
20 oF
Outlet
Local
CH Config
Outdoor Reset Config
Warm weather shutdown
CH Config

CHS Series Controller and Display │Slant Fin Corp.
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Use of 4-20mA Input
Setpoint source –If “Local” is selected as the “Setpoint source”, the “CH setpoint”value entered on the screen,
depicted in Figure 2-10, is used for control. If 4-20mA is selected as the “Setpoint source”, the boiler determines
its setpoint from the 4-20mA signal. The setpoint is calculated from a factory-set scale between 60°F
corresponding to 4mA, and 190°F corresponding to 20mA. If the 4-20mA input signal is invalid, out of range, or
absent, the “CH setpoint”is used until the signal is valid again. Regardless of the “Setpoint source”, “Local” or
“4-20mA”, the controller’s internal PID algorithm modulates the burner.
Mod rate source –The Slant/Fin CHS controller supports two methods of burner modulation for CH, selected
by the “Mod rate source” parameter, depicted on Figure 2-10; the factory set method is by internal PID
algorithm. The installer has the option to use a 4-20mA signal from an external control to directly modulate the
burner. Rates vary (see Section 2.4.5 Modulation Config) from minimum at 4mA to CH maximum at 20mA.
The 4-20mA signal does not create burner demand; a call for heat must be present; i.e. CHI input made when
“Demand Switch” = LCI..
Table 2-6 Central Heat Configuration Parameters
Parameter
Description
Factory Settings
Demand
switch *
Source of CH demand:
Sensor only (modulation sensor –no contact closure required)
LCI (contact closure of “CH1” to “R”, i.e. via a thermostat)
LCI
Setpoint
source *
Select the Central Heat setpoint source:
Local (control references “CH setpoint”setting)
4-20mA with sensor on/off [remote source]
Local
CH setpoint
Setpoint value for CH modulation. If “Outdoor reset”is set to “Disable”, this is the
target temperature at the “Modulation sensor”. If “Outdoor reset”is set to “Enable”,
this is the maximum target temperature at the “Modulation sensor” (see Section
2.4.1.2 Outdoor Reset Config). Range 60°F to 190°F
180°F
Off hysteresis
Value added to CH setpoint to determine water temperature at which the burner will
shut off e.g. if CH setpoint is 180°F, and CH off hysteresis is 10°F, the burner will be
shut off at 190°F. Range 2°F to 20°F
10°F
On hysteresis
Value subtracted from “CH setpoint”to determine water temperature at which the
burner will fire e.g. if “CH setpoint”is 180°F, and “CH on hysteresis”is 20°F, the
burner will fire at 160°F. Range 2 °F to 40°F
20°F
Modulation
sensor *
Select which sensor Central Heat will modulate to:
Outlet
Inlet
S10 [System (pipe) temperature sensor]
Outlet sensor
Mod rate
source *
Select which source controls the modulation rate:
Local [PID control]
4-20mA with sensor on/off [remote source]
Local
* = Password protected

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2.4.1.2 CH Config - Outdoor Reset Config
Figure 2-10 Outdoor Reset Configuration Screen
(CH Config) Outdoor Reset Config –sub-menu
screen, allows the installer to set parameters specific
to the effect the outdoor temperature has on the
operation of the boiler during local (i.e. non Lead
Lag) Central Heat demands. Use the up and down
(▲▼) buttons to navigate the menu options; when
the desired option is highlighted select by pressing the
“OK” button.
Outdoor Reset is in effect only if the following two
conditions are met: “Outdoor reset”is set to "Enable",
and an outdoor temperature sensor is connected to the
boiler. The “Outdoor Reset Config”parameters,
together with the “CH Config”parameters, define the
relationship of boiler temperature setpoint to outdoor
temperature. Refer to Figure 2-12 for an example of
the relationship between outdoor temperature and
boiler temperature, with a given set of settings.
Table 2-7 Outdoor Reset Configuration Parameters
Parameter
Description
Factory Settings
Outdoor reset
enable
Enables or disables Outdoor reset
Enabled
Max outdoor
temp
Outdoor temperature that corresponds to the “Low water temp” setting. Example:
If the “Low water temp” setting is 95°F, and the “Max outdoor temp” setting is
70°F, the boiler setpoint will be 95°F when the outdoor temperature is 70°F or
higher. Range 50°F to 95°F
70ºF
Min outdoor
temp
Design Temperature - Outdoor temperature that corresponds to the “CH
setpoint” setting. Example: If the “CH setpoint” is 180°F, and the “Min outdoor
temp” setting is 0°F, the boiler setpoint will be 180°F when the outdoor
temperature is 0°F or lower. Range -40°F to 40°F
0ºF
Low water temp
Minimum boiler setpoint; occurs when the outdoor temperature is equal to or
greater than the “Max outdoor temp”. Range 60°F to 140°F
95ºF
Outdoor boost
max off point
Read only –functional in future revisions.
130ºF
Figure 2-11 Outdoor Reset Graph
Outdoor reset
Max outdoor temp
Min outdoor temp
Low water temp
Outdoor boost max off point
Enable
70 oF
0 oF
95 oF
130 oF
Outdoor Reset Config
Point defined by:
Min outdoor temp= 0ºF
Point defined by:
Max outdoor temp= 70ºF

CHS Series Controller and Display │Slant Fin Corp.
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2.4.1.3 CH Config - Warm Weather Shutdown
Figure 2-12 WWSD Configuration Screen
(CH Config) Warm Weather Shutdown
(WWSD) –sub-menu screen, allows the installer to
enable the WWSD function for local (i.e. non Lead
Lag) Central Heat demands, and define at what
outdoor temperature it is initiated. Use the up and
down (▲▼) buttons to navigate the menu options;
when the desired option is highlighted select by
pressing the “OK” button.
When “Warm weather shutdown” is set to one of the
“Shutdown” options, and the outdoor temperature is
above the “Warm weather shdn setpoint”, CH
operation is inhibited.
CH operation is restored when the outdoor
temperature drops below the WWSD setpoint by a
fixed value of 4ºF.
Table 2-8 Warm Weather Shutdown Configuration Parameters
Parameter
Description
Factory Settings
Warm weather
shutdown
Enable or Disable Warm Weather Shutdown and select shutdown options
Shutdown after demand ends
Shutdown immediately
Disable
Disable
Warm weather
shdn setpoint
Temperature at which local Central Heat operation is inhibited. Not applicable
when “Warm weather shutdown” is set to “Disable”. Range 50°F to120°F
60°F
Warm weather shutdown
Warm weather shdn setpoint
Disable
60 oF
Warm Weather Shutdown

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2.4.2 DHW Config
Figure 2-13 Domestic Hot Water Configuration Screen
DHW Config –menu screen, accessed by selecting
“DHW Config” from the “Advanced Setup” screen, lists
the configuration parameters specific to boiler operation
for a DHW demand. Use the up and down (▲▼)
buttons to navigate the menu options; when the desired
option is highlighted select by pressing the “OK” button.
Demand switch - DHW demand can be initiated by a
contact closure, “DHW switch”, or by a tank
temperature sensor, “DHW Sensor with On/Off Temp”.
Mod sensor –The control can be set to use the “Outlet”
or “Inlet” sensor for regulation of burner modulation.
When “Demand switch” is set to
“DHW Sensor with On/Off
Temp”, demand is determined by
the Demand ON and OFF temp settings.
Table 2-9 DHW-Domestic Hot Water Configuration Parameters
Parameter
Description
Factory Settings
Demand
switch *†
Select which sensor is the DHW demand source:
DHW switch
DHW Sensor with On/Off Temp
(If “DHW Sensor with On/Off Temp is selected, a tank sensor must be used to
generate a demand.)
DHW switch
Mod
sensor *
Select the DHW modulation sensor:
Outlet
Inlet
Outlet
DHW
setpoint
Setpoint for DHW modulation. If “Mod sensor” is set to “DHW” or “Inlet”, reduce
setting accordingly. Range 60°F to 190°F
180°F
Off
hysteresis *
Value added to “DHW setpoint”to determine water temperature at which the burner
will shut off e.g. if “DHW setpoint”is 180°F, and “Off hysteresis”is 10°F, the
burner will be shut off at 190°F. Range 5°F to 70°F
10°F
On
hysteresis *
Value subtracted from “DHW setpoint”to determine water temperature at which the
burner will fire e.g. if “DHW setpoint”is 180°F, and “On hysteresis”is 10°F, burner
ignition occurs at 170°F. Range 2°F to 40°F
10°F
Priority
time *
Time period during which a DHW demand has priority. If override time has elapsed,
the boiler and CH pump (Pump C) will service a CH demand regardless of DHW
demand. Value=0 inhibits DHW priority. Range 0 to 18 hours.
2 hour
Demand
ON temp*
DHW demand is switched ON when DHW tank temperature is < this setting.
Applied when “Demand switch”is set to “DHW Sensor with on/off temperatures”.
Range 60°F to 165°F.
135 oF
Demand
OFF temp *
DHW demand is switched OFF when DHW tank temperature is ≥this setting.
Applied when “Demand switch”is set to “DHW Sensor with on/off temperatures”.
Range 65°F to 170°F.
140 oF
* = Password protected
†= If “Demand switch” is set to “DHW Sensor with On/Off Temp”, demand is determined by the Demand ON and OFF temp settings.
DHW tank sensor MUST be used in conjunction with a DHW temperature safety shutoff
switch. Failure to provide such a switch may result in property damage, serious injury to
occupants, or possibly death.
Demand switch
Mod sensor
DHW setpoint
Off hystersis
On hysteresis
Demand ON temp
Demand OFF temp
DHW switch
Outlet
180 oF
10 oF
10 oF
135 oF
140 oF
DHW Config

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2.4.3 Lead Lag Config
The CHS boiler can be used as a stand-alone unit or as part of a cascaded arrangement with as many as 8 CHS
boilers. The Lead Lag Configuration parameters determine the boiler’s (or group of boilers) behavior during a
Lead Lag heat demand [i.e. CH2 (LL) heat input]. Only a demand on CH2 (LL) will initiate Lead-Lag, or
“staging”, of cascaded boilers. For stand-alone boilers, the CH2 (LL) demand simply behaves as a second heat
input (CH1 being the first). Note: a demand for central heat from CH1, takes priority over a demand for central
heat from CH2 (LL).
To enable, or allow the use of Lead-Lag function and the CH2 (LL) input, the “Lead Lag Master Config”
parameter “Master enable”, must be set to “Enable”; see Section 2.4.3.1 Lead Lag Master Config. In Lead Lag
cascade boiler arrangements, only one boiler has “Master enable” set to “Enable”, the others are set to “Disable”
(factory default).
Check List for Lead Lag Installation:
1. All Boilers in Cascade
a. Wire boilers together –Daisy-chain Data Communication wiring between boilers. See Installation and
Operating Instructions (Not applicable for stand-alone boiler applications).
b. Lead Lag Slave Configuration Settings (Optional) –Adjust the “Lead Lag Slave Config” setting “Slave
mode”, as desired. See Section 2.4.3.2.
c. MB2 Modbus address –set a unique “MB2 Modbus address”for each boiler. See Section 2.4.4.1 System
ID & Access.
2. Master Boiler in Cascade
a. Set “Master enable” to “Enable” – Select one boiler in the cascade to be Master; set its “Master enable”
setting to “Enable”. Other boilers are left as “Disable” (factory default). For stand-alone boilers the lone
boiler must have “Master enable” configured as “Enable”. See Section 2.4.3.1 Lead Lag Master Config.
b. Lead Lag Master Configuration Settings –Adjusted the “Lead Lag Master Config” and “Outdoor Reset”
settings to the desired values on the boiler with “Master enable” configured as “Enable”. No need to
adjust these settings on other boilers.
c. Heat Demand Input [CH2 (LL)] –Wire the head demand input to CH2 (LL) of the boiler with “Master
enable” configured as “Enable”.
d. System Sensor (Optional) –Wire the system (pipe) sensor to the boiler with “Master enable” configured
as “Enable”.
3. Any Boiler in Cascade
a. Outdoor Sensor (Optional) –Wire the outdoor sensor to any boiler within the cascade. Note: only one
outdoor sensor is required for a multiple boiler application.
b. System Pump Control (Optional) –With “CH pump use for LL master” set to “On”. The respective boiler
will operate the CH pump (Pump C) anytime there is a Lead Lag heat demand. See Section 2.4.4.2 Pump
Config.

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Figure 2-14 Lead Lag Configuration Main Menu Screen
Lead Lag Config –main menu screen, accessed by
selecting “Lead Lag Config” from the “Advanced
Setup” screen, lists the sub-menus specific to the Lead
Lag Configuration. Use the up and down (▲▼)
buttons to navigate the menu options; when the
desired option is highlighted select by pressing the
“OK” button.
2.4.3.1 Lead Lag Master Config
Figure 2-15 LL Master Configuration Screen
Lead Lag Master Config –sub-menu screen,
allows the installer to set parameters specific to the
boiler response and operation for Lead Lag CH2 (LL)
demands. Use the up and down (▲▼) buttons to
navigate the menu options; when the desired option is
highlighted select by pressing the “OK” button.
Master enable –must be set to “enable” in order for
the boiler to respond to a CH2 (LL) demand (only one
boiler in the cascade can have “Master enable” set to
“Enable”.
Setpoint source –The boiler LL setpoint can be
“Local”, i.e. the “Setpoint” set from the display, or “4-
20mA” set from an external source.
System Sensor –When using the optional system
(pipe) sensor; the controller automatically uses it as
the modulation sensor –reduce the “Setpoint”
accordingly.
Master enable
Setpoint source
Setpoint
Off hysteresis
On hysteresis
P gain
Igain
Base load common rate
Disable
Local
150 oF
15 oF
15 oF
30
15
70%
Lead Lag Master Config
Lead Lag Master Config
Lead Lag Slave Config
Lead Lag Outdoor Reset
Lead Lag Config

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Table 2-10 Lead Lag Master Configuration Parameters
Parameter
Description
Factory Settings
Master
enable *
Enable or Disable Lead Lag Master. One (and only one) unit must be set to
“Enable” for Lead Lag operation to function.
Disable
Setpoint
source *
Select the Lead Lag setpoint source:
Local (control references “Setpoint” setting)
4-20mA (control references 4-20mA signal from an external control). “Outdoor
reset enable” must be set to “Disable”when using a 4-20mA signal; see Section
2.4.3.3 Lead Lag Outdoor Reset.
Local
Setpoint
Setpoint value for Lead Lag modulation. Range 60°F to 190°F.
150°F
Off
Hysteresis *
Value added to the “Setpoint” to determine water temperature at which the burner
will shut off. Example: If “Setpoint” is 150°F, and “Off hysteresis” is 15°F, the
burner will be shut off at 165°F. Range 5 °F to 70°F.
15°F
On
Hysteresis *
Value subtracted from “Setpoint” to determine water temperature at which the
burner will fire. Example: If “Setpoint” is 150°F, and “On hysteresis” is 10°F,
burner ignition occurs at 140°F. Range 2°F to 40°F.
10°F
P Gain *
Gain applied to the proportional term of the LL PID control algorithm. Range 5 to
50 (no units). Decrease to slow rate of control response.
30
I Gain *
Gain applied to the integral term of the LL PID control algorithm. Range 5 to 50 (no
units). Decrease to slow rate of control response.
15
Base load
common *
Maximum modulation rate of all firing units when other units are still available and
idle. Range 25 - 100%.
70%
* Password protected
Use of 4-20mA Input
Setpoint source –If “Local” is selected as the “Setpoint source”, the “Setpoint”value entered on the screen,
depicted in Figure 2-16, is used for control. If 4-20mA is selected as the “Setpoint source”, the boiler
determines its setpoint from the 4-20mA signal. The setpoint is calculated from a factory-set scale between 60°F
corresponding to 4mA, and 190°F corresponding to 20mA. If the 4-20mA input signal is invalid, out of range, or
absent, the “Setpoint”is used until the signal is valid again. Regardless of the “Setpoint source”, “Local” or “4-
20mA”, the controller’s internal PID algorithm modulates the burner. The 4-20mA signal does not create
burner demand; a call for heat must be present at the CH2 (LL) input.

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2.4.3.2 Lead Lag Slave Config
Figure 2-16 LL Slave Configuration Screen
Lead Lag Slave Config –sub-menu screen, allows
the installer to set the “Slave mode” which establishes
the order in which the boiler is chosen during the
staging sequence of a Lead Lag demand.
Use First –This mode has priority over all others. A
unit with its “Slave mode”set to "Use First", will
always fire first before any other slave in the cascade
and it will be the last one dropped.
Equal run time –This mode stages the units based
on run time equalization where the unit with the least
burner hours fires first and the most burner hours
fires last. Only "Use First" has higher priority.
Use Last –This mode has the lowest priority. A unit
with its “Slave mode”set to "Use Last", will always
fire last after every other slave in the cascade is
running. It will be the last slave to fire and the first
one dropped.
Table 2-11 Lead Lag Slave Configuration Parameters
Parameter
Description
Factory Settings
Slave mode *
Select slave mode from drop down list:
Use First
Equal run time
Use Last
Equal run time
* Password protected
Slave mode
Equal run time
Lead Lag Slave Config