WT-4000 Series Pneumatic-to-Direct Digital Control (DDC)
Room Thermostats Installation Instructions
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for the most up-to-date version of this document.
1
Application
The WT-4000 Series Pneumatic-to-Direct Digital
Control (DDC) Room Thermostats provide reliable
zone comfort and enhanced energy economy via
remote monitoring and temperature setpoint
management. This arrangement provides greater
energy policy compliance, and facilitates trending of
floor space usage in commercial, industrial, and
municipal HVAC environments.
The WT-4000 Series Room Thermostats are ideally
suited for energy-saving, pneumatic-to-DDC building
upgrades. Designed for non-invasive replacement
of existing manual pneumatic thermostats, the
WT-4000 Series Room Thermostats provide a number
of DDC features, including remote wireless setpoint
control and occupancy scheduling, and continuous
room temperature, branch line pressure, and battery
status monitoring. All of these features were previously
unavailable in existing pneumatic HVAC control
systems.
The innovative design of the WT-4000 Series Room
Thermostats completely reshapes the pneumatic
HVAC control industry. The room thermostat itself does
not utilize any mechanical parts. A solid state
temperature sensor replaces the bi-metallic strip
elements for precise room temperature monitoring. In
addition, an advanced piezoelectric air valve replaces
the mechanical relay for improved branch line pressure
control. All of these technologies provide longer, more
dependable, and maintenance-free operation.
Models are available for wireless mesh
communications, or they can be configured in the field
for stand-alone applications. In a wireless mesh
network application, the WT-4000 Series Room
Thermostat communicates with the controller by
means of a Johnson Controls® WT-ROUTER Router
and Johnson Controls WT-BAC-IP Gateway.
Some WT-4000 Series Room Thermostats include a
binary dry contact input for an occupancy sensor (field
furnished), to detect motion and determine if a space is
occupied. This feature maximizes up to 30% energy
savings in high-energy usage environments such as
schools, dormitories, offices, and hospitals by adjusting
the temperature of the space based on the occupancy
status.
All WT-4000 Series Room Thermostats include an
LCD, with either a Fahrenheit or Celsius temperature
display. Depending on the model chosen, the room
thermostat can transmit sensed temperature, setpoint
temperature, occupancy status, and low battery
conditions to an associated router and gateway. The
WT-4000 Series Room Thermostat is designed for
indoor, intra-building applications only.
The WT-4000 Series uses a proprietary
direct-sequence, spread-spectrum RF technology,
and operates on the 2.4 GHz Industrial, Scientific, and
Medical (ISM) band. The room thermostat meets the
IEEE 802.15.4 standard for low power, low duty cycle
RF transmitting systems.
IMPORTANT:
The WT-4000 Series
Pneumatic-to-DDC Room Thermostat is intended to
provide an input to equipment under normal
operating conditions. Where failure or malfunction of
the room thermostat could lead to personal injury or
property damage to the controlled equipment or
other property, additional precautions must be
designed into the control system. Incorporate and
maintain other devices, such as supervisory or
alarm systems or safety or limit controls, intended to
warn of or protect against failure or malfunction of
the room thermostat.
IMPORTANT:
Le WT-4000 Series
Pneumatic-to-DDC Room Thermostat est destiné à
transmettre des données entrantes à un équipement
dans des conditions normales de fonctionnement.
Lorsqu'une défaillance ou un dysfonctionnement du
room thermostat risque de provoquer des blessures
ou d'endommager l'équipement contrôlé ou un autre
équipement, la conception du système de contrôle
doit intégrer des dispositifs de protection
supplémentaires. Veiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que des
systèmes de supervision ou d'alarme, ou des
dispositifs de sécurité ou de limitation, ayant une
fonction d'avertissement ou de protection en cas de
défaillance ou de dysfonctionnement du room
thermostat.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC)
Room Thermostats
Installation Instructions
WT-4002-MCR, WT-4002-MCM,
WT-4002-MFR, WT-4002-MFM
Part No. 24-10732-5, Rev. D
Issued August 2017
24- 10732- 5, Rev . D
