EXW Singapore — collect or forward from our Singapore office.

3G Electric
PRO1 IAQ T721 Manual Changeover Digital Thermostat - Digital Thermostats
PRO1 IAQDigital Thermostats

PRO1 IAQ T721 Manual Changeover Digital Thermostat

The PRO1 IAQ T721 is a square, push-button digital thermostat for heat-or-cool applications. It operates on 18V AC with a manual changeover and system settings for Cool, Emergency Heat, Heat, and Off. Key features…

SKU 3G-OTH-70402

Also listed as: T 721 · T-721

Brand
PRO1 IAQ
Item
T721 Manual Changeover Digital Thermostat
Part Number
T721
Category
Digital Thermostats
Available to Order
Also known as:T721PRO1 IAQ
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

PRO1 IAQ
Manufacturer Part Number
T721
Type
Manual, B/C/G/O/R/W2/W/E/Terminal Designations
Shape
Square
Voltage
18V AC
Digit Size
Easy Read
Application
Heat or Cool
Control Type
Push Button
Fan Settings
Auto-On
Key Features
Easy Access Battery Compartment
Changeover Type
Manual
System Settings
Cool-Emergency Heat-Heat-Off
Mounting Direction
Horizontal
Terminal Designations
R
Temperature Differential
0.2°F to 2°F
Temperature Control Range
44° to 90°F

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

PRO1 IAQ Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The PRO1 IAQ T721 is a square, push-button digital thermostat for heat-or-cool applications. It operates on 18V AC with a manual changeover and system settings for Cool, Emergency Heat, Heat, and Off. Key features include an easy-access battery compartment, a 0.2°F to 2°F temperature differential, and a 44° to 90°F control range.

Frequently Asked Questions

What is the PRO1 IAQ T721 thermostat used for?

The PRO1 IAQ T721 is a manual-changeover digital thermostat for heat-or-cool applications in residential or light commercial HVAC systems. It controls temperature from 44° to 90°F with a 0.2°F to 2°F differential, supporting Cool, Emergency Heat, Heat, and Off settings.

What are the specifications of the PRO1 IAQ T721 thermostat?

The PRO1 IAQ T721 operates on 18V AC, has a square push-button design, manual changeover, and terminal designations including R. It features an easy-access battery compartment, Auto-On fan setting, and a temperature control range of 44° to 90°F with a 0.2°F to 2°F differential.

Where to buy the PRO1 IAQ T721 thermostat worldwide?

3G Electric supplies the PRO1 IAQ T721 thermostat to customers worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this thermostat to your facility, regardless of location.

How to install the PRO1 IAQ T721 thermostat?

Install the PRO1 IAQ T721 by mounting it horizontally on a wall, connecting the 18V AC power and R terminal wire, and setting the manual changeover to Heat or Cool. Always follow the manufacturer's wiring diagram and turn off power at the breaker before installation.

Used in

Common applications for PRO1 IAQ
Residential HVAC — PRO1 IAQ T701i Wi-Fi thermostat for 7-day programmable heat and cool control
Light commercial zoning — PRO1 IAQ T755WHO wireless thermostat with 2H/2C conventional or 3H/2C heat pump staging
Humidification control — PRO1 IAQ T855iSH thermostat with humidification and Hi-Med-Low fan settings
Remote temperature sensing — PRO1 IAQ R251S indoor or R250S outdoor sensor for T755S, T855S, and T955S models
Tamper prevention — PRO1 IAQ thermostat guard with lock and key for restricted-access areas
Wall repair after thermostat replacement — PRO1 IAQ wall cover plate, 5-1/2 in x 7-1/2 in, horizontal or vertical mount
Not sure this is the right part? Photo-identify it→

PRO1 IAQ Products

3G Electric supplies PRO1 IAQ digital thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from PRO1 IAQ

View all PRO1 IAQ parts →

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first