DAIKIN DTST-CWBSA-NI-A Unitary Aux Heater Installation Guide
- June 6, 2024
- Daikin
Table of Contents
Unitary Aux Heater
Installation and Setup
Aux wiring
- The thermostat Aux outputs are dry contacts that close the connection to turn on the Aux equipment.
- A 24V AC control signal must be routed through one of the aux contacts of the thermostat.
*The terminals are selected in the Daikin One+ installer wizard.
Note: It is recommended to use a minimum of 18-gauge wire.
The maximum operating length of the wire is 125 ft.
Aux Heat Setup on Daikin One+
Add Equipment – Auxiliary Heat
- Selecting add equipment will allow you to configure an auxiliary heat source.
*Aux heat source is the only option for an AC-only outdoor unit.
Secondary Heat Settings
- The control section will allow you to adjust settings such as lockouts and secondary heat activation temperature.
*Emergency Heat mode will appear as a system mode when connected to heat pump units and can be used to directly turn on the aux heat source if enabled.
T on/T off Control
- T on and T off provides an alternative control method to have the main AC/heat pump control the aux heat source using its PI control algorithm.
- T on/T off is the only control option for AC- only outdoor units
- If the indoor unit is a gas furnace or is an air handler with a heater strip, these heat sources will be controlled around the heat setpoint by the demand-based algorithm.
- The aux heat source will be controlled independently.
Heat Pump as Primary Heat Source
- When a heat pump is the primary heat source:
- Heat pump lockout temperatures are adjustable from -20°F to 65°F in 5°F increments. (default 15°F)
- Auxiliary heat lockout temperatures are adjustable from -10°F to 75°F in 5°F increments. (default 50°F)
Auxiliary heat demand:
- T on the differential is adjustable from -7°F to -3°F in 1°F increments (default -3°F)
- T off differential is adjustable from -4°F to 1°F in 1°F increments (default 1°F)
Auxiliary Heat as Primary Heat Source
- When auxiliary heat is the primary heat source:
- Heat pump lockout temperatures are adjustable from -20°F to 65°F in 5°F increments. (default 15°F)
- Setpoint differential can be set at -9°F, -7°F, -4°F, and -2°F (default -2°F)
Heat pump demand:
- T on differential can be set at -1°F or -2°F (default -1°F)
- T off differential 1°F fixed
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