What are the specs for this Transformer?

The correct replacement for Tempstar model TCA748GKA200 — 208/230V to 24V | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number TCA748GKA200 — 208/230V to 24V | Ships Today.

Is this transformer compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar 40VA Transformer for TCA748GKA200 — 208/230V to 24V | Ships Today

Name: Tempstar 40VA Transformer for TCA748GKA200 — 208/230V to 24V | Ships Today
Brand: Tempstar
SKU: 1170676-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1170676-GEN Brand: Tempstar

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Overview

This genuine OEM control transformer (part number 1170676) supplies low-voltage power for the Tempstar TCA748GKA200. It steps the 208/230V line-voltage primary down to a 24V secondary at 40VA, energizing the contactor coil, control board, safety switches, and thermostat circuit. When the transformer fails, the entire 24V control circuit goes dead — the contactor will not pull in, the unit will not respond to a cooling call, and the system appears completely unresponsive even though line power is present. A shorted secondary or an overloaded transformer can also blow the control fuse repeatedly.

Specifications

Spec	Value
Part Number	1170676
Type	Control Transformer
Brand	Tempstar
Rating	40 VA
Primary Voltage	208/230V
Secondary Voltage	24V
Application	24V control circuit

Compatibility

Direct-fit replacement for the Tempstar TCA748GKA200 and shared across many ICP-family units (Heil, Comfortmaker, Arcoaire) using the same 40VA 208/230-to-24V control transformer. Verify the part number, VA rating, and primary tap configuration on your existing transformer before installing.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
Access — Remove the control panel cover to reach the transformer mounting and terminals.
Document — Photograph the primary and secondary wiring, noting which primary tap (208 vs 230) is used.
Remove — Disconnect the leads, unbolt the old transformer from its bracket, and lift it out.
Install — Mount the new transformer, land the primary on the matching voltage tap and the secondary on the 24V terminals exactly per your photo.
Test — Restore power and confirm 24V across the secondary, that the contactor pulls in on a cooling call, and that the control fuse holds.

Signs You Need a Replacement

No 24V output at the secondary terminals.
Contactor will not energize and the unit is unresponsive to the thermostat.
Repeatedly blown low-voltage control fuse.
Transformer is hot, buzzing loudly, or shows scorching/melted housing.

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

Tempstar 40VA Transformer for TC...

$32.00

Frequently Asked Questions

Does this Transformer fit my Tempstar TCA748GKA200 — 208/230V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TCA748GKA200 — 208/230V to 24V | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my Tempstar TCA748GKA200 — 208/230V to 24V | Ships Today?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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