Temperature Modes, Single Setpoint & Setpoint Offset Modes- Facilisight Web App

| Overview

Temperature Modes introduces configurable temperature interaction modes across the CCU, portals, occupant applications, and supported devices. These modes define how heating and cooling desired temperatures are presented to users and how they respond to user adjustments.

The single set point mode is applicable only for the edge devices and occupant app.

The objective is to:

• Improve user comfort control experience

• Reduce user confusion in managing dual setpoints

• Maintain system stability and configure deadbands

• Provide flexible UI representations depending on device or application context

It introduces building-level temperature control modes and zone/device-level temperature interaction modes.

| Single Setpoint Mode

Single Setpoint simplifies temperature control by allowing the user to interact with one temperature value.

Internally, the system derives HDT and CDT.

| Single Setpoint Calculation

Example configuration:

| Derivation

Heating Desired Temp:

HDT = Heat Max - Heat DB
HDT = 72 - 2 = 70

Cooling Desired Temp:

CDT = Cool Min + Cool DB
CDT = 72 + 2 = 74

Single Setpoint:

SP = (HDT + CDT) / 2
SP = (70 + 74) / 2 = 72

Displayed setpoint:

72°F

| Allowed Range

Minimum:

Heat Min + Heat DB
= 67 + 2/2
= 68

Maximum:

Cool Max - Cool DB
= 77 - 2/2
= 76

Range:

68 – 76°F

| Updating Setpoints from Single SP

If user selects:

SP = 74

Derived values:

HDT = SP - Heat DB = 74 - 2 = 72
CDT = SP + Cool DB = 74 + 2 = 76

| Single Setpoint Mode in Occupant App

The interface displays:

• Current Room Temperature (shown in white)
• Desired Temperature (Setpoint) (shown in orange)
• Configured minimum and maximum temperature limits
• Draggable temperature control handle

When the occupant adjusts the orange control handle, the desired temperature updates in real time.

| Mode Change Behaviour

Switching from Variable Deadband → Single Setpoint

If existing schedules violate the single setpoint rules, schedules are reset to default values.

Default Values

Schedule timings remain unchanged.

| Setpoint Offset Mode

The Setpoint Offset control enables occupants to temporarily adjust the room's comfort level within a predefined range established by the building administrator. Rather than exposing actual heating or cooling setpoints, the application presents a relative comfort scale, allowing users to indicate whether they prefer the space to be slightly cooler or warmer.

This approach provides occupants with limited environmental control while ensuring the HVAC system continues operating within energy-efficient boundaries.

Setpoint Offset allows occupants to adjust comfort preference without directly modifying absolute setpoints.

The UI presents:

Cooler  ← 0 → Warmer

| Offset Calculation

Example base setpoints:

HDT = 70
CDT = 74

Base single setpoint:

SP = 72

Offset = 0

Offset +1

Effective SP:

73°F

Derived:

HDT = 71
CDT = 75

Deadband remains constant.

| Offset Range Determination

The offset range depends on the configured limits.

Example:

Minimum SP:

67 + 2/2 = 68

Maximum SP:

77 - 2/2 = 76

Range:

68 – 76= 8

Offset scale:

8/2= 4 (-2 to +2)

| Offset Mode in Occupant App

How It Works

The comfort dial represents the available adjustment range using five offset values:

Each value represents a relative offset from the building's configured temperature setpoint rather than an actual room temperature.

| Visual Representation in Occupant App

The circular comfort dial provides an intuitive visualization of the current comfort preference.

Neutral (0)

• Indicator positioned at the top-center of the dial.
• Represents the default building comfort setting.
• No temperature offset is applied.

Displayed Value

0
Comfort

Slightly Warmer (+1)

• Indicator moves into the red section.
• Requests a small increase in room temperature.

Displayed Value

+1
Comfort

Warmer (+2)

• Indicator reaches the far end of the red arc.
• Represents the maximum warmer preference permitted.

Displayed Value

+2
Comfort

Slightly Cooler (-1)

• Indicator moves into the blue section.
• Requests a slight decrease in room temperature.

Displayed Value

-1
Comfort

Cooler (-2)

• Indicator reaches the far end of the blue arc.
• Represents the maximum cooler preference permitted.

Displayed Value

-2
Comfort

| Offset Mapping

| Rounding Rules

When converting Celsius values:

| Offset Rounding Logic

If calculated, the single setpoint has decimals:

Rules:

• Positive offsets → round up

• Negative offsets → round down

| HVAC Mode Behaviour

If system capability is:

Cooling Only

Single setpoint range becomes:

Cool Min → Cool Max

Heating Only

Range becomes:

Heat Min → Heat Max

| Temperature Mode Simulator

The Temperature Mode Simulator provides an interactive environment for validating temperature control configurations before they are applied to a zone schedule. Instead of making configuration changes directly on a schedule and observing the behavior later, users can simulate how different temperature modes respond using the current user limits, desired temperatures, deadbands, offsets, and conditioning modes.

The simulator enables facility managers and commissioning engineers to compare multiple temperature control strategies side-by-side and understand how each mode affects zone operation. Once the desired configuration has been validated, the simulated settings can be applied directly to the selected schedule.

For more information on the temperature mode siulator refer to Temperature Mode Simulator