Temperature Mode - Single Setpoint Mode

| Overview

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
= 69

Maximum:

Cool Max - Cool DB
= 77 - 2
= 75

Range:

69 – 75°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

| Setpoint Offset Mode

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 = 69

Maximum SP:

77 - 2 = 75

Range:

69 – 75

Offset scale:

-3 to +3

| Offset Mapping

| Rounding Rules

When converting Celsius values:

| Offset Rounding Logic

If calculated 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