We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual - Digital Thermostats
PRO1 IAQDigital Thermostats

PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual

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

Brand
PRO1 IAQ
Item
Low Voltage Thermostat: Heat or Cool, Manual
Category
Digital Thermostats
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

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
View Full Spec Sheet

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.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

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
Commercial HVAC maintenance — PRO1 IAQ T855SH thermostat for multi-stage heat pump control in office buildings
Facility energy management — PRO1 IAQ T805 programmable thermostat for 7-day scheduling in retail spaces
Light commercial retrofit — PRO1 IAQ T501M analog thermostat for simple heat/cool control in small shops
Indoor air quality monitoring — PRO1 IAQ R751WO wireless sensor for temperature and motion detection in conference rooms
Heat pump system replacement — PRO1 IAQ T625-2 thermostat for 2H/1C heat pump staging in residential units
Thermostat guard replacement — PRO1 IAQ T150K replacement keys for securing T150 plastic guards in public areas

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 →

Similar products

Matched by specification & description
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/E/Terminal Designations (MPN T705). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/E/Terminal Designations (MPN T705). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations (MPN T805). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations (MPN T805). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/E/G/O/R/W2/Terminal Designations, Square (MPN T725). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional, 2H/1C Heat Pump; Programming Capability: 7 Day; Shape: Square; Terminal Designations: B; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/E/G/O/R/W2/Terminal Designations, Square (MPN T725). Key specifications — Application: Heat and Cool; Stages: 1H/1C Conventional, 2H/1C Heat Pump; Programming Capability: 7 Day; Shape: Square; Terminal Designations: B; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Auto, B/C/GH/GL/O/R/W/Terminal Designations, Auto (MPN T731W). Key specifications — Application: Heat and Cool; Key Features: Private Label Badge System; Temperature Differential: 0.2�°F to 2°F; Voltage: 18V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Auto, B/C/GH/GL/O/R/W/Terminal Designations, Auto (MPN T731W). Key specifications — Application: Heat and Cool; Key Features: Private Label Badge System; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic.
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Auto, B/C/G/O/RC/RH/W2/W/E/Terminal Designations/Y2 (MPN T755). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional, 3H/2C Heat Pump; Programming Capability: 7 Day; Shape: Square; Terminal Designations: RC; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic; Brand: PRO1 IAQ.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Auto, B/C/G/O/RC/RH/W2/W/E/Terminal Designations/Y2 (MPN T755). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional, 3H/2C Heat Pump; Programming Capability: 7 Day; Shape: Square; Terminal Designations: RC; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic; Brand: PRO1 IAQ.
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/W2/Terminal Designations/Y2 (MPN T715). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y2; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat and Cool, Manual, B/C/G/O/RC/RH/W/W2/Terminal Designations/Y2 (MPN T715). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional; Programming Capability: 7 Day; Shape: Square; Terminal Designations: Y2; Temperature Control Range: 44° to 90°F; Changeover Type: Manual; Brand: PRO1 IAQ.

More from PRO1 IAQ

View all PRO1 IAQ parts →
PRO1 IAQ Low Voltage Non-Programmable Thermostat: Heat and Cool, Manual, Low-High, Heat-Cool-Off (MPN T731). Key specifications — Application: Heat and Cool; Key Features: Easy Wire Color Coded Terminal Blocks; Temperature Differential: +/-4°F; Voltage: 18 to 30V AC; Terminal Designations: O; System Settings: Heat-Cool-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ
PRO1 IAQ Low Voltage Non-Programmable Thermostat: Heat and Cool, Manual, Low-High, Heat-Cool-Off (MPN T731). Key specifications — Application: Heat and Cool; Key Features: Easy Wire Color Coded Terminal Blocks; Temperature Differential: +/-4°F; Voltage: 18 to 30V AC; Terminal Designations: O; System Settings: Heat-Cool-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations, Square (MPN T701). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/C/G/O/RC/RH/W/Terminal Designations, Square (MPN T701). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ Low Voltage Non-Programmable Thermostat: Heat and Cool, Auto, Hi-Med-Low-Auto-Off, Square (MPN T751). Key specifications — Application: Heat and Cool; Key Features: Battery or 24V Power; Temperature Differential: +/-4°F; Voltage: 18 to 30V AC; Terminal Designations: B; System Settings: Auto-Heat-Cool-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic.
PRO1 IAQ
PRO1 IAQ Low Voltage Non-Programmable Thermostat: Heat and Cool, Auto, Hi-Med-Low-Auto-Off, Square (MPN T751). Key specifications — Application: Heat and Cool; Key Features: Battery or 24V Power; Temperature Differential: +/-4°F; Voltage: 18 to 30V AC; Terminal Designations: B; System Settings: Auto-Heat-Cool-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Automatic.
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, C/G/RC/RH/Y/W, Auto-On, Cool-Heat-Off, Square (MPN T771). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: Y/W; System Settings: Cool-Heat-Off; Temperature Control Range: 25° to 99°F; Changeover Type: Manual.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, C/G/RC/RH/Y/W, Auto-On, Cool-Heat-Off, Square (MPN T771). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: Y/W; System Settings: Cool-Heat-Off; Temperature Control Range: 25° to 99°F; Changeover Type: Manual.
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN T601-2). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN T601-2). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/C/E/G/O/R/W2/Terminal Designations, Auto-On (MPN T621-2). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.
PRO1 IAQ
PRO1 IAQ Low Voltage Thermostat: Heat or Cool, Manual, B/C/E/G/O/R/W2/Terminal Designations, Auto-On (MPN T621-2). Key specifications — Application: Heat or Cool; Key Features: Easy Access Battery Compartment; Temperature Differential: 0.2°F to 2°F; Voltage: 18V AC; Terminal Designations: B; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 44° to 90°F; Changeover Type: Manual.