Tempstar PTAC Low-Temp Thermostat Kit for THB09R25DCA — 24V Control with Knob | Ships Today

Overview

This OEM PTAC thermostat kit provides complete temperature control for the Tempstar THB09R25DCA packaged terminal unit. It includes the 24V PTAC thermostat (OEM 1058517), the low-temperature cutout thermostat (OEM 1059022) that protects the unit in cold conditions, and the matching control knob (OEM 1058437). Together they set the comfort temperature and guard against low-temperature operation. Symptoms of failure include the unit ignoring the setpoint, running nonstop, short-cycling, or tripping out in cold weather. Installing the factory-correct thermostat set restores accurate, protected control.

Specifications

Compatibility

Direct-fit replacement for the Tempstar THB09R25DCA PTAC. The thermostat, low-temp cutout, and knob are shared across Heil, ICP, and Comfortmaker PTAC equipment in the THB09 series. Verify your existing part numbers before ordering for an exact match.

Installation Guide

1. Safety First — Disconnect power at the unit and breaker, verify zero voltage with a multimeter.
2. Access — Remove the front grille and control panel cover to reach the thermostat assembly.
3. Document — Photograph all wiring and the low-temp sensor routing before disconnecting.
4. Remove — Pull the knob, release both stats from their brackets, and disconnect the 24V leads.
5. Install — Mount the new thermostat and low-temp cutout, reconnect per your photo, and seat the knob.
6. Test — Restore power and verify the unit responds to setpoint changes and holds in heat and cool.

Signs You Need a Replacement

• Unit never reaches the set temperature or runs continuously.
• Knob no longer changes the setpoint.
• Nuisance tripping or shutdown in cold conditions.
• Short-cycling or no response to the dial.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.