Tempstar 40VA Transformer for TCH636GKA100 — 208/230V to 24V | Ships Today
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Overview
This OEM 40VA control transformer (part number 1170676) supplies the low-voltage power your Tempstar TCH636GKA100 system needs to run its thermostat, contactor coil, control board, and safety circuits. It steps the incoming 208/230V line voltage down to the 24V secondary that nearly every HVAC control component depends on. When a transformer fails, the entire control side of the unit goes dead — the system simply will not respond. A buzzing transformer, a blown low-voltage fuse, or a unit that has power at the disconnect but no thermostat response are classic signs this part has failed and needs replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1170676 |
| Type | Control / Step-Down Transformer |
| Brand | Tempstar (ICP / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fitment | OEM Replacement |
Compatibility
Engineered as a direct OEM replacement for the Tempstar TCH636GKA100. Because it is a genuine ICP/Heil-family component, it also fits a wide range of Tempstar, Heil, Comfortmaker, and ICP heat pump and air handler systems that use the 1170676 transformer. Always confirm the part number on your existing transformer before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and service disconnect, then verify zero voltage with a multimeter on both line and load sides.
- Access — Remove the unit's electrical service panel to expose the control box.
- Document — Photograph every primary and secondary wire connection before disconnecting anything.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer from its mounting bracket.
- Install — Mount the new 1170676 transformer, then reconnect the primary and secondary wiring exactly as photographed.
- Test — Restore power and confirm 24V across the secondary terminals and proper thermostat/contactor response.
Signs You Need a Replacement
- No 24V at the thermostat or control board despite line voltage being present
- Repeatedly blown low-voltage fuses on the control board
- Audible buzzing or burning smell from the transformer
- System completely unresponsive to thermostat calls
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days