What are the specs for this Transformer?

The correct replacement for Tempstar model THB09R34RTA — 277V to 24V w/ 24V Relays | 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 THB09R34RTA — 277V to 24V w/ 24V Relays | 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 THB09R34RTA — 277V to 24V w/ 24V Relays | Ships Today

Name: Tempstar 40VA Transformer for THB09R34RTA — 277V to 24V w/ 24V Relays | Ships Today
Brand: Tempstar
SKU: 1053004-GEN
Price: 38.00 USD
Availability: InStock

SKU: 1053004-GEN Brand: Tempstar

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Overview

This OEM 40VA control transformer steps 277V line voltage down to 24V to power the low-voltage control circuit on the Tempstar THB09R34RTA PTAC. The control package also includes the 24V relays (OEM 1053004 SPST and 1060940 DPST) that switch the unit's components on the transformer's 24V output. When a transformer fails open or shorts, the unit loses all 24V control power — the thermostat goes dead, relays will not pull in, and the system will not start. Replacing it with the correct 277V/40VA OEM transformer restores low-voltage control.

Specifications

Spec	Value
Part Number	1091226 (Transformer), 1053004 / 1060940 (Relays)
Type	Step-Down Control Transformer
Brand	Tempstar (ICP / Heil)
Rating	40VA
Primary Voltage	277V
Secondary Voltage	24V

Compatibility

Built for the Tempstar THB09R34RTA PTAC chassis and shared ICP / Heil 277V PTAC platforms using the same control package. Verify your primary voltage (277V) and VA rating before ordering.

Installation Guide

Safety First — Disconnect power at the PTAC plug/breaker and verify zero voltage with a multimeter.
Access — Remove the front grille and control panel cover.
Document — Photograph all primary and secondary wiring before disconnecting.
Remove — Unfasten the failed transformer and disconnect its leads.
Install — Mount the new transformer, matching 277V primary and 24V secondary leads per your photo.
Test — Restore power and confirm 24V at the secondary and proper relay operation.

Signs You Need a Replacement

No 24V control power; thermostat is completely dead
Relays will not energize
Burned, melted, or buzzing transformer
Repeated control-fuse failures

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 TH...

$38.00

Frequently Asked Questions

Does this Transformer fit my Tempstar THB09R34RTA — 277V to 24V w/ 24V Relays | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar THB09R34RTA — 277V to 24V w/ 24V Relays | 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 THB09R34RTA — 277V to 24V w/ 24V Relays | 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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