The Setpoint Control 161 is a single stage heat setpoint
control that can operate on an On / Off differential or can
operate on Pulse Width Modulation. The control includes
special modes for hot tub, domestic hot water tank and
radiant floor applications.
Use the Lock / Unlock DIP switch to lock or unlock the Access Level of the 161.
• To unlock the Access Level, set the DIP switch to the unlocked (left) position.
• To lock the Access Level, set the DIP switch to the locked (right) position. Once
locked, a padlock is displayed in the lower right corner of the display and the Access
Level cannot be changed.
Note: The tN4 System Control’s Lock / Unlock DIP switch overrides the Lock / Unlock
DIP switch on the 161. Set the tN4 System Control’s Lock / Unlock DIP switch to the
Unlock position before Access Levels can be changed on the setpoint control.
tN4 System Control (DIP Switch #2)
A tN4 System Control is a control, not a thermostat, that the Setpoint Control 161
connects to through the tN4 bus. All tN4 compatible Outdoor Reset Modules are
tN4 System Controls.
For product instructions see brochure
• If the setpoint control is connected
to a tN4 System Control, set the tN4
System Control DIP switch to tN4
System Control (left position).
• If the setpoint control is not connected
to a tN4 System Control, set the tN4
System Control DIP switch to None
(right position).
The Access Level restricts the number of Menus, Items and Adjustments that can
be accessed by the user. The Access Level setting is found in the Miscellaneous
(MISC) menu. Select the appropriate access level for the people who work with the
setpoint control on a regular basis.
The 161 has five Access Levels:
• Advanced
• Installer
• User (USEr): for property owners
• Limited (LTD): limited temperature adjustment
• Secure (SEC): for commercial and public installations
In the Limited access level, the temperature can only be adjusted by +/-3°F (1.5°C)
from the temperature setting entered prior to entering the Limited access level.
In the Secure access level, all settings, including the temperature, cannot be
changed.
For more information, see the Miscellaneous (MISC) Menu section.
In the following menu tables, the access level the item is visible in is shown in the
access column.
To adjust the Access Level:
1. Set the Unlock / Lock DIP switch to the unlock position. If a tN4 System Control
is connected to the 161, the Unlock / Lock DIP switch on the tN4 System Control
must be set to the unlock position.
2. Use the Menu button to select the MISC menu.
3. Use the Item button to select the Access item.
4. Use the Up and Down button to select the required Access Level.
Displays whether the device
is in heating or off mode.
RELAY 1
Displays when relay contact
1 is closed.
WARNING
An error is present.
tN4 COMMUNICATION
A tN4 network is detected.
LOCK
The Access Levels are
locked or a menu option is
visible but not adjustable.
OCCUPIED
Displays when operating at
the occupied temperature.
UNOCCUPIED
Displays when operating
at the unoccupied setback
temperature.
TIME OCCUPIED
Displays when operating
temporarily at the occupied
temperature due to a remote
enable or manual enable.
User Interface
Use the User Interface available on the Liquid Crystal Display (LCD) to setup and
monitor the operation of the setpoint control. Use the four push buttons below the
LCD (Menu, Item, Up, Down) to select settings. As the settings are entered, record
the settings in the Job Record J 161.
Menu
The menus display in the Menu Field at
the left of the LCD.
Up to 5 menus are available:
• VIEW
• ADJUST
• SCENE
• SCHD (Schedule)
• MISC (Miscellaneous)
To select a menu, press and release the
Menu button.
Item
In each menu, a group of items can be
selected. The abbreviated name of the
selected item displays in the Item field of
the LCD display.
• To view the next available item, press
and release the Item button.
• To view the previous item, hold down
the Item button and press and release
the Up button.
Adjusting a Setting
To adjust a setting:
1. Use the Menu button to select the appropriate menu.
2. Use the Item button to select a menu item.
3. Use the Up or Down button to adjust the setting.
To set the default item in the VIEW Menu, display item for more than five seconds.
After navigating menus, the display reverts back to the default item after 60 seconds
of button inactivity.
Continue to
next Item
Continue to
next Item
Continue to next Menu
Application Overview
The Setpoint Control 161 is designed to support four different applications. The items
shown in the VIEW and ADJUST Menu change depending on the Application Mode.
Set the application mode as follows:
1) Setpoint
2) Hot Tub
3) DHW Tank
4) Floor
The VIEW and ADJUST menus list which of the four application items are visible
based upon the mode column.
The TIME, SCENE, SCHD (Schedule) and MISC (Miscellaneous) menus are the
same for the four application modes.
When heating, the setpoint control turns
on Relay 1 when the temperature falls to
1/2 of the differential below the setpoint
and turns off Relay 1 once the temperature
reaches 1/2 of the differential above the
setpoint.
Differential
Relay 1 On / Off Differential
Operation
The On / Off Differential operates by
centering a differential range around
the target setpoint temperature. On / Off
differentials are best suited to heating loads
that quickly change temperature.
Applications: Pulse Width Modulation
Heating On / Off Differential
Relay 1
On
Relay 1
On
Target + ½ Differential
Tar get
Target – ½ Differential
Mode 4 Floor
Relay 1 Pulse Width Modulation
(PWM) Operation
PWM operates by centering the throttling
range around the target setpoint temperature.
PWM is best suited for large heating loads
that do not change rapidly in temperature
such as radiant floors.
Heating Operation
When the temperature is at the setpoint,
Relay 1 is on for 50% of a cycle and off
for 50% of a cycle. When the temperature
is 1/2 of the throttling range below the
setpoint, Relay 1 is on for 100% of a
cycle. When the temperature is 1/2 of the
throttling range above the setpoint, Relay
1 is off for 100% of a cycle. For ranges
within the throttling range, Relay 1’s on
time increases linearly as temperature
falls. The throttling range is fixed at 3°F
(1.5°C).
The cycle length is either the same as
the tN4 system control, or when a tN4
system control is not present, the cycle
length is fixed at 15 minutes.