WT-4002-MCR Johnson Controls Thermostat

Overview

The Johnson Controls WT-4002-MCR is a high-performance Wireless Pneumatic-to-Direct Digital Control (DDC) Room Thermostat designed to modernize legacy pneumatic HVAC systems. It provides a non-invasive, cost-effective retrofit solution that delivers the benefits of a modern DDC system—such as remote monitoring, occupancy scheduling, and precise temperature management—without the need for extensive replumbing or rewiring. By replacing traditional mechanical components with a solid-state temperature sensor and an advanced piezoelectric air valve, the WT-4002-MCR ensures dependable, maintenance-free operation and enhanced energy economy.

Features

• Wireless RF Communications: Enables real-time status updates and central automation through a wireless mesh network.
• Piezoelectric Air Valve: Replaces mechanical relays to improve branch line pressure control and eliminate the need for manual calibration.
• Solid-State Sensing: Utilizes a high-precision electronic sensor instead of bi-metallic strips for accurate room temperature monitoring.
• Dual Control Action: Supports both direct-acting (DA) and reverse-acting (RA) two-pipe configurations.
• Intuitive LCD: Provides a digital display of room temperature, setpoint, branch pressure, and battery status.
• Energy Saving Tools: Supports remote setpoint management and programmable occupancy scheduling to reduce energy consumption by up to 30%.
• Stand-alone Capability: Can be configured in the field for independent operation without a central gateway if necessary.

Specifications

• Brand: Johnson Controls
• Model: WT-4002-MCR
• Series: WT-4000
• Display: Liquid Crystal Display (LCD) with Celsius temperature scale
• Power Source: Four 3.6 VDC size AA lithium batteries (typical 4-year life)
• Control Action: 2-Pipe, DA/RA dual control
• Wireless Frequency: 2.4 GHz ISM band (Direct-sequence, spread-spectrum)
• Setpoint Range: 55 to 85 degrees Fahrenheit (13 to 29 degrees Celsius)
• Sensitivity: Adjustable from 1 to 5 psi/F
• Air Connections: Dual barbed fittings for 5/32 in. or 1/4 in. O.D. polytubing
• Housing Material: White ABS plastic

Applications

• Commercial Buildings: Ideal for retrofitting office spaces to meet modern energy policy compliance.
• Educational Institutions: Used in schools and dormitories to automate temperature control based on occupancy.
• Healthcare Facilities: Provides precise environmental control in hospitals while minimizing maintenance disruptions.
• Municipal and Industrial Sites: Facilitates trending of floor space usage and centralized HVAC management in large-scale environments.
• Energy Upgrades: Specifically designed for facilities looking to transition from pneumatic to DDC technology with minimal occupant disturbance.