Trumeter’s line of timer switches for HVAC applications help protect compressors, manage inrush current, and keep operation stable. The TS Series delivers reliable timing control with selectable ranges, common control voltages, and clear status indicators in a panel-ready design.
This video breaks down the main timer types in the TS Series, how they differ, and where each one fits best in HVAC applications.
By Timer Type:
- 00:15 — On-Delay (DOM) — TS01, TS02, TS03
- 00:40 — Off-Delay (DOB) — TS04
- 01:00 — Star–Delta — TS05, TS06
- 01:30 — Asymmetrical — TS08
- 02:02 — Multi-Function — TS07, TS09 (analog); TS7954, TS7957, TS7958 (digital)
- 02:35 — Key Features
- 02:46 — Contact an expert
Timing Modes and Functions
Each model in the TS Series targets a specific task, so you can select the function and timing range that match your application.
On-Delay
- What it does: Starts equipment a few seconds apart so everything doesn’t fire at once.
- Models: TS01, TS03
Off-Delay (DOB)
- What it does: Adds a short pause after shutdown to protect compressors or keep a fan/exhaust running briefly.
- Model: TS04
Star–Delta
- What it does: Gives larger motors a gentler start to reduce stress and noise.
- Models: TS05, TS06
Asymmetrical
- What it does: Runs on a repeating schedule with different “on” and “off” lengths, which is ideal for ventilation, dehumidifiers, or pacing heat-pump defrost.
- Models: TS08
Multi-Function
- What it does: Combines several behaviors in one unit (staggered starts, compressor rest, simple cycling) so you can standardize parts.
- Analog models: TS07, TS09 | Digital models: TS7954, TS7957, TS7958
Key Features of the TS Series
Compact footprint
The TS Series fits a small panel envelope and offers panel or DIN-rail mounting, with clearly labeled terminals and an SPDT (COM/NC/NO) output for straightforward coil-leg wiring.
Flexible timing ranges
Each model provides selectable ranges—seconds for start staggering or purge, and minutes for compressor off time—with adjustments via rotary dial or DIP switches and fine trim (depending on the model) to achieve repeatable setpoints.
Low power draw
The design places a light load on 24, 120, and 240 VAC control transformers, helping to minimize heat rise inside the enclosure.
Durable, HVAC-grade build
The relay and contact design handles inductive loads such as contactor coils, and the construction resists panel vibration and the electrical noise common in mechanical rooms.
Wide operating temperature
Timing remains stable across a broad ambient range suitable for indoor mechanical spaces and conditioned outdoor enclosures; exact limits vary by model.
How To Choose The Right Timer Switch
Each timer switch model is designed to solve a specific HVAC challenge, so selection hinges on function, timing range, and control voltage. For side-by-side details, visit the Knowledgebase article: Which Timer Switch Model Is Right for My HVAC?
Talk To An Expert
Connect with a Trumeter tech expert to choose the right timer switch for you.
