Timer Delays TD69 & TD73 are adjustable timer delays (time delay relays) that help protect HVAC systems from short cycling. They’re a simple add-on when you need a start or stop delay to keep equipment running smoother.

They’re quick to wire with 1/4" quick-connect terminals, and you can dial in the delay you need without guesswork.

Best for: HVAC techs, installers, maintenance teams, and switched-on DIYers doing repairs or upgrades where short cycling is causing stress on the system.

Compatible with: HVAC control circuits where a timed delay is required. If you’re running a different voltage or control setup, confirm wiring and specs before ordering/installation.

Features

• Helps reduce short cycling to protect compressors and controls
• 1/4" male quick connect terminals for faster wiring
• TD69: Adjustable delay on make (start delay)
• TD73: Adjustable delay on break (stop delay)
• Simple dial-style adjustment for quick setup
• Jumper option for use with 110/250V systems (cut jumper wire as required)

Technical Specifications

• Product type: Timer delays / time delay relays
• Terminals: 1/4" male quick connect
• TD69 function: Delay on make (start delay)
• TD69 range: 6 seconds to 8 minutes
• TD73 function: Delay on break (stop delay)
• TD73 range: 6 seconds to 5 minutes
• Voltage note: Cut jumper wire to use with 110/250V systems (follow the included instructions)

What’s in the Box

• 1 x TD69 timer delay relay (delay on make), or
• 1 x TD73 timer delay relay (delay on break)

Why “Short Cycle Protection”?

• Gives the system a breather between cycles
• Helps avoid rapid on/off starts that wear components faster
• Can improve stability after power blips or quick thermostat calls
• Easy way to add control without changing major parts
• Adjustable timing so you can suit the job, not guess it

Using Your Timer Delays: Step-by-Step

1. Isolate power to the unit at the switchboard and confirm it’s off.
2. Identify whether you need a delay on make (TD69) or delay on break (TD73).
3. Mount the relay where it’s protected and wiring is neat (avoid heat and moisture).
4. Connect wiring to the 1/4" quick connect terminals as per the wiring diagram.
5. If required for your system, cut the jumper wire for 110/250V use (follow included instructions).
6. Set the delay time on the dial (start at the lower end, then fine-tune).
7. Restore power, test operation, and confirm the delay behaves as expected.

Limitations & Safety Notes

• Electrical work should be carried out by a licensed person where required.
• Confirm the correct model (TD69 vs TD73) for your control goal before installing.
• Confirm voltage and wiring requirements before making any changes.
• Do not work on live electrical components—always isolate and test.
• Install in a protected location away from water, corrosion, and extreme heat.
• If you’re unsure, check the unit wiring diagram or speak with a qualified technician.

Shipping & Returns

We ship Australia-wide. For dispatch timeframes, delivery info, and return steps, please see our Shipping & Returns page.

Timer Delays FAQs

What’s the difference between TD69 and TD73?

TD69 is a delay on make (it delays the start). TD73 is a delay on break (it delays the stop). Choose based on whether you want to slow down switching on or switching off.

What delay range do they cover?

TD69 adjusts from 6 seconds to 8 minutes. TD73 adjusts from 6 seconds to 5 minutes.

Are these used to prevent short cycling?

Yes. These timer delays are commonly used to reduce rapid on/off cycling, which can be hard on compressors and control gear.

Can I use this on 110/250V systems?

The TD series includes a jumper option—cut the jumper wire for 110/250V use as per the included instructions. Always confirm suitability for your exact unit before install.

How do I choose the right delay time?

Start with a shorter delay, test, then increase only if needed. You want protection from quick cycling without making the system feel sluggish.

What should I check before ordering?

Confirm whether you need a start delay (TD69) or stop delay (TD73), confirm your control voltage and wiring, and check you have a safe mounting spot inside the unit.

Why Buy From HVAC Shop

• Aussie-based support from people who know HVAC parts
• Fast shipping Australia-wide
• Trade-friendly HVAC controls and electrical spares
• Secure checkout
• Help with sizing and compatibility checks

Want the complete setup? Shop our HVAC controls and parts range for more relays, controls, and electrical essentials.