What are the specs for this Transformer?

The correct replacement for Tempstar model TCH660GKA100 — 40VA 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 TCH660GKA100 — 40VA 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 Transformer for TCH660GKA100 — 40VA 208/230V to 24V | Ships Today

Name: Tempstar Transformer for TCH660GKA100 — 40VA 208/230V to 24V | Ships Today
Brand: Tempstar
SKU: 1170676-GEN
Price: 28.95 USD
Availability: InStock

SKU: 1170676-GEN Brand: Tempstar

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Overview

This OEM transformer (part #1170676) is the low-voltage power supply for your Tempstar TCH660GKA100 condensing unit. It steps the incoming 208/230V line voltage down to the 24V control voltage that operates the contactor coil, control board, and thermostat circuit. Rated at 40VA, it delivers enough current to energize the unit's control components reliably. When a transformer fails, the most common symptoms are a completely dead control circuit — no contactor pull-in, an unresponsive thermostat, or a blown low-voltage fuse on the control board. A buzzing, overheated, or scorched transformer is a clear sign of failure, often caused by a shorted thermostat wire or a stuck contactor that overdraws the 24V circuit.

Specifications

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

Compatibility

Designed as a direct-fit replacement for the Tempstar TCH660GKA100 condensing unit. This transformer is also widely used across ICP-family equipment, including matching Heil, Comfortmaker, and Tempstar outdoor units that share the same 208/230V to 24V 40VA control platform. Always confirm your existing transformer's VA rating and voltage taps before installing.

Installation Guide

Safety First — Disconnect power at the breaker and pull the outdoor disconnect. Verify zero voltage at the transformer terminals with a multimeter before touching any wiring.
Access — Remove the control-panel service cover on the condensing unit to expose the transformer.
Document — Photograph all primary and secondary wire connections before disconnecting anything.
Remove — Label and disconnect the primary (line voltage) and secondary (24V) leads, then unbolt the transformer from its mounting bracket.
Install — Mount the new transformer, then reconnect the primary leads to the correct voltage tap and the secondary 24V leads exactly as photographed.
Test — Restore power and confirm 24V across the secondary terminals and proper contactor pull-in on a call for cooling.

Signs You Need a Replacement

No 24V control voltage — contactor will not pull in and the unit is dead
Repeatedly blown low-voltage fuses on the control board
Buzzing, overheating, or a visibly scorched/melted transformer body
Thermostat and controls intermittently lose power

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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 Transformer for TCH660G...

$28.95

Frequently Asked Questions

Does this Transformer fit my Tempstar TCH660GKA100 — 40VA 208/230V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TCH660GKA100 — 40VA 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 TCH660GKA100 — 40VA 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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