Johnson Controls WT-4000 WT-4002-MCR, WT-4002-MCM, WT-4002-MFR, WT-4002-MFM thermostats Installation Instructions
Below you will find brief information for thermostats WT-4000 WT-4002-MCR, thermostats WT-4000 WT-4002-MCM, thermostats WT-4000 WT-4002-MFR, thermostats WT-4000 WT-4002-MFM. This series consists of reliable room thermostats that provide direct digital control (DDC) of pneumatic heating, ventilation and air conditioning (HVAC) systems. Wireless mesh network application supported and temperature setpoint management is provided.
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24- 10732- 5, Rev . C
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. C
Issued March 2016
Refer to the QuickLIT website for the most up-to-date version of this document.
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
1
IMPORTANT: The WT-4000 Series
Pneumatic-to-DDC Room Thermostat is not designed or intended for use in mission-critical or life/safety applications.
North American Emissions Compliance
United States
Compliance Statement (Part 15.19)
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1.
This device may not cause harmful interference, and
2.
This device must accept any interference received, including interference that may cause undesired operation.
Warning (Part 15.21)
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Canada
Industry Canada Statement
The term IC before the certification/registration number only signifies that the Industry Canada technical specifications were met.
Le terme « IC » précédant le numéro d'accréditation/ inscription signifie simplement que le produit est conforme aux spécifications techniques d'Industry
Canada.
Installation
The first step of the installation process is to plan the layout of the devices on the building floor plan. This process includes identifying the desired locations for all
WT-4000 Series Pneumatic-to-DDC Room
Thermostats, as well as the Johnson Controls
WT-BAC-IP Gateway.
Next, measure the radial distances between each
WT-4000 Series Room Thermostat and the
WT-BAC-IP Gateway, to determine if the distances are within 200 ft (61 m). If the distance exceeds 200 ft
(61 m), Johnson Controls WT-ROUTER Routers must be installed to relay signals between each room thermostat and the associated gateway.
The ideal installation provides each room thermostat with at least two routes of transmission to the gateway, to ensure signal transmission success. The nominal transmission range of each router in a standard building is 200 ft (61 m). To ensure proper signal transmission in a wireless mesh network, there should be at least two routers, or one router and one gateway, located within a 200 ft (61 m) radius of every room thermostat.
In order for the devices to connect to the same mesh network, they all must have the same group ID. Both the group ID and the device ID can be changed in the
field; see Net Config Screen on page 10 for more
details.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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Dimensions
4-23/32
(120)
3-3/4
(95)
13/16
(21)
Figure 1: WT-4000 Series Pneumatic-to-DDC Room Thermostat,
Dimensions, in. (mm)
Mounting
The WT-4000 Series Room Thermostats require the
WT-BAC-IP Gateway and WT-ROUTER Router to operate as a complete wireless solution. Refer to the
WT-BAC-IP Gateway Installation Instructions
(Part No. 24-10732-21) for details on installing the gateway, and the WT-ROUTER Router Installation
Instructions (Part No. 24-10732-13) for details on installing the router.
Tools and Hardware Required
• Couplings or reducers to connect room thermostats to existing air lines
• Needle nose pliers
• Small level
• Fasteners and anchors to secure room thermostats
(site specific)
• Plastic tie wraps to secure routers (site specific)
• Electric drill (optional)
• Building floor plans identifying where the system is to be installed, serving multiple purposes:
To plan the wireless network before installation, by identifying room thermostat locations
To document the location of where each wireless device is installed
Mounting Procedure
Mount the WT-4000 Series Room Thermostat according to the steps that follow. Only those individuals that are experienced with HVAC maintenance and commercial room thermostats should perform this installation.
1.
Remove the old room thermostat from the mounting surface and disconnect the air lines connected to it. Be sure to label the branch line and the main line.
2.
Bend the four locking tabs on the wallplate outward to separate the wallplate from the new
WT-4000 Series Room Thermostat.
3.
Mount the wallplate to the mounting surface: a.
Thread the existing air lines from the wall through the large opening in the wallplate.
b.
Position the wallplate against the mounting surface to be sure it seats flush with the surface.
c.
Use a small level or visually check that the wallplate is level.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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d.
Mounting holes on the wallplate are designed to fit a standard electrical box. If additional mounting holes are required, mark the locations on the mounting surface.
e.
Remove the wallplate from the mounting surface and drill any additional mounting holes as needed at each of the marked locations.
f.
Use the appropriate mounting hardware (field furnished) for the specific mounting surface and secure the wallplate to the surface.
4.
Connect the air lines to the room thermostat. See
Clean Air Requirements on page 5 to ensure that
the air supply is clean, dry, and oil-free.
IMPORTANT: Avoid applying excessive pressure while making the air line connections to the barbed fittings on the room thermostat. Failure to do so may damage the room thermostat and void the warranty.
5.
Install the four 3.6 V lithium batteries included with the room thermostat into the battery compartment.
Be sure to match the positive (+) battery ends with the positive (+) battery terminals in the battery compartment.
Note: The room thermostat can operate with just two batteries installed; however, it operates for a significantly shorter period of time. To maximize battery life, we recommend that all four batteries be installed.
6.
Once powered up, the room thermostat initializes in: a.
30 seconds if the room thermostat can connect to a network.
b.
3 minutes if a network is not present.
IMPORTANT: Do not press any buttons during the initialization process. Configuration changes made during initialization are not saved.
Figure 2 illustrates the LCD during room
thermostat initialization.
Figure 2: LCD during Initialization
7.
Check the wireless connectivity at the intended room thermostat installation location. It may take approximately 30 seconds for the room thermostat to initialize.
a.
Look at the wireless connection status
indicator on the room thermostat LCD
shows on the upper-right corner of the LCD, the wireless connection is established and the room thermostat is operating properly. If the LCD is blank in the upper-right corner, there is no wireless connection.
b.
Look at the number of routes to the
WT-BAC-IP Gateway on the room thermostat
LCD (Figure 4). If the number of routes is
blank, the room thermostat is not connected to the gateway. If the number 1 shows, there is one connection. If the number 2 shows, there are two or more connections and the room thermostat is operating properly.
8.
Attach the room thermostat to the previously installed wallplate by aligning the slot in the room thermostat housing with the top of the wallplate and sliding the bottom of the room thermostat housing over the bottom of the wallplate.
9.
Document the device ID and the location of each room thermostat on the floor plan.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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Safety Measures for Electrostatic Sensitive
Devices (ESDs)
The WT-4000 Series Room Thermostat includes an
ESD-sensitive circuit board. Use caution when handling the room thermostat when the backplate
(wallplate) is removed. Do not physically touch any part of the circuit board while connecting air lines, without wearing ESD protective gear. Even minimal electrostatic discharge can severely damage the room thermostat.
Clean Air Requirements
Before installing WT-4000 Series Room Thermostats, check that the air in the pneumatic lines is properly cleaned. Clean, dry, and oil-free air in the main supply line is required for normal room thermostat operation.
The pneumatic system must include a properly operating air dryer and coalescing air filter that removes water, oil, and other impurities from the main supply air before it reaches the room thermostat. If the existing pneumatic system is contaminated with water or oil, Johnson Controls recommends installation of a pre-filter before each room thermostat to protect the device from contaminants and failure.
Note: Room thermostat failures due to main supply air contamination with impurities including water, oil, dust, or other solid particles are not replaceable under the product warranty.
Johnson Controls recommends using the following in-line air filter with WT-4000 Series Room
Thermostats:
• Johnson Controls A-4000-1037 In-Line Air Filter
Before installing room thermostats, check for the following:
• An air dryer that is operating properly
• A coalescing air filter that is replaced and maintained properly
• In-line air filters before each room thermostat where necessary
Order of Installation for Wireless Room
Thermostat Models
The WT-4000 Series Room Thermostats look for a wireless network as soon as they are powered up. We recommend that the WT-BAC-IP Gateway and
WT-ROUTER Router are installed first to establish a network connection before the room thermostats are installed and powered.
If the room thermostats are installed before establishing a wireless network, be aware of the following:
• Once powered up, the room thermostat initializes and looks for a network for 3 minutes. During
initialization, the LCD shows code 512 (Figure 2).
IMPORTANT: Do not press any buttons during the initialization process. Configuration changes made during initialization are not saved.
• The room thermostat operates in the Occupied
Mode with the following default settings:
• Setpoint temperature: 70°F (21°C)
• Comfort Zone: ±3F° (±1.8C°)
• The default settings can only be changed from the controller tool, once the WT-BAC-IP Gateway is installed.
• Once the WT-BAC-IP Gateway and the
WT-ROUTER Routers are installed, check the LCD on each room thermostat to confirm that they are
connected to the network (Figure 4).
• The default sampling interval is 5 minutes, so it may take some time for all of the room thermostats to establish a network connection.
In summary, install the components of the mesh network in the following order:
1.
Install the WT-BAC-IP Gateway.
2.
Install the WT-ROUTER Routers.
3.
Configure the WT-4000 Series Room Thermostats;
see Setup and Adjustments on page 6.
4.
Install the WT-4000 Series Room Thermostats; see
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
5
Setup and Adjustments
Since the room thermostats are battery-powered devices with internal memory, they can be configured prior to, or right after, installation. Johnson Controls recommends that all of the room thermostats be configured before installation, to prevent any possible issues with operation.
for LCD Details
Shoulder Mode Button –
Triggers Manual Shoulder
(Unoccupied) Mode
Up Button –
Increases the Room
Temperature Setpoint
Override Mode Button –
Triggers Manual Override
(Occupied) Mode
Down Button –
Decreases the Room
Temperature Setpoint
Light Button – Lights the
Display for 10 Seconds
Figure 3: WT-4000 Series Pneumatic-to-DDC Room Thermostat
Button Descriptions
Operating Mode Wireless Connection Status
Room Temperature or
Requested Setpoint
(When Up or Down
Buttons are Pressed)
Actual Branch
Line Pressure (psig)
Received Signal
Strength Indicator
Number of Routes to the
WT-BAC-IP Gateway
Battery Voltage Level
Heat or Cool Output
Fan Output
Requested Branch
Line Pressure (psig)
Error Code Display
Figure 4: Expanded View of LCD Showing Details
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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LCD Details
Operating Mode
a.
Occupied – Scheduled Occupied Mode: The temperature can be adjusted within the
Comfort Zone.
b.
Unoccupied – Scheduled Unoccupied
Mode: The HVAC controls are off and the temperature cannot be adjusted. To turn the
HVAC controls on, press the Override button
to put the room thermostat in the
Override mode, and then adjust the temperature setting using the Up/Down buttons.
c.
Override – Manual Override Mode: The temperature can be adjusted within the
Comfort Zone.
d.
Shoulder – Manual Unoccupied Mode: The temperature cannot be adjusted. To put the room thermostat back to its scheduled mode, press the Shoulder button again;
Occupied reappears on the main screen.
Wireless Connection Status
Indicates if the room thermostat is connected to the
WT-BAC-IP Gateway.
a.
: A connection is established.
b.
Blank: There is no connection.
Number of Routes to the WT-BAC-IP Gateway
Indicates how many communication paths exist between the room thermostat and the WT-BAC-IP
Gateway.
a.
Blank: The room thermostat is not connected to the WT-BAC-IP Gateway.
b.
1: One connection exists.
c.
2: Two or more connections exist and the room thermostat is operating properly.
Battery Voltage Level
a.
: The battery is fully charged.
b.
: The battery charge is low and the batteries should be replaced.
Heat or Cool Output
a.
: Cooling is on.
b.
: Heating is on.
Requested Branch Line Pressure – psig (kPa)
Indicates the required branch line pressure based on the control calculation.
Actual Branch Line Pressure – psig (kPa)
Indicates the measured values of the branch line pressure. The actual branch line pressure should be within 0.6 psig (4 kPa) of the requested branch line pressure.
Display Codes
Table 1: Display Codes
Description
2
4
Display
Code
0 psig (0 kPa) available in main line
Insufficient branch line pressure
8
12
16
22
24
512
1024
Any
Other
Number
Pressure down leak in the system (pressure decreases when it should remain constant)
Insufficient branch line pressure and pressure down leak in the system
Pressure up leak in the system (pressure increases when it should remain constant)
Insufficient branch line pressure and pressure up leak in the system
Both pressure down leak and pressure up leak in the system
Configuring wireless network
Time and Date need to be configured
(Stand-Alone Mode)
Product error; contact the local
Johnson Controls representative
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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Received Signal Strength Indicator
Indicates the relative strength of the wireless signal between the room thermostat and the device it is communicating with.
a.
-39 and higher: A strong and solid wireless connection exists; no further analysis is required.
b.
-44 to -40: The wireless signal is getting through; however, the room thermostat should be monitored. If the signal strength deteriorates further, there is a risk of data loss.
Consider adding a WT-ROUTER Router between the devices to strengthen the signal.
c.
-45 and lower, or --- : The room thermostat has a very weak wireless connection or it is failing to connect to other devices on the network, resulting in the loss of a significant number of data packets. The room thermostat may be located too far from the other devices or there may be wireless interference in the area. To strengthen the wireless signal, add a
WT-ROUTER Router between the problematic devices on the network to create an additional connection point.
Room Temperature or Requested Setpoint
Indicates the current room temperature. Pressing the
Up/Down buttons once shows the locally-defined setpoint temperature.
Adjusting the Room Setpoint Temperature
The WT-4000 Series Room Thermostat operates in conjunction with the preset building configuration parameters; therefore, the room setpoint temperature can only be changed within predefined Comfort Zone limits.
1.
Confirm that the room thermostat is in the scheduled Occupied Mode; the top of the LCD must read Occupied.
2.
The temperature reading on the LCD displays the current room temperature. To increase or decrease the room setpoint temperature, press the Up/Down buttons to select the desired setpoint.
a.
When the Up/Down buttons are pressed once, the LCD shows the user-defined room setpoint value and the LCD reads Setpoint.
Note: When the room temperature and the setpoint value are the same, the HVAC equipment is off.
b.
If neither the Up or Down button is pressed again, the LCD returns to the main screen within 5 seconds.
c.
When the setpoint is displayed, keep pressing the Up/Down buttons to reach the desired room setpoint temperature.
d.
If the Up/Down buttons are pressed and the setpoint stops increasing or decreasing, predefined Comfort Zone limits have been reached. If the setpoint does not change, the local controls are disabled.
Note: Contact the building administrator if the room temperature minimum or maximum allowable settings are not comfortable.
e.
The room thermostat decides to heat or cool based on the current room temperature and the specified setpoint.
3.
When the desired setpoint is specified, the LCD returns to the main screen within 5 seconds.
4.
If the LCD reads Unoccupied, the room thermostat is scheduled to be in the Unoccupied
Mode. If the area requires heating or cooling while the room thermostat is in the Unoccupied Mode, press the Override button to change the
room thermostat to the Override Mode. See Using
the Override Mode Button that follows.
Using the Override Mode Button
If the LCD reads Unoccupied, the room thermostat is scheduled to be in the Unoccupied Mode and the local room thermostat controls are disabled. If the area requires heating or cooling:
1.
Press the Override button to change the room thermostat to the Override Mode.
2.
The room thermostat stays in the Override Mode, as defined by the configuration parameters (default
2 hours). The room setpoint temperature can be adjusted within predefined Comfort Zone limits for the duration of the Override Mode period.
3.
See Step 2 in the Adjusting the Room Setpoint
Temperature section to change the room setpoint
temperature.
4.
Once the Override Mode period expires, the room thermostat returns to its originally scheduled mode.
If the heating or cooling period needs to be extended, press the Override button again
and follow Step 2 in the Adjusting the Room
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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Using the Shoulder Mode Button
The Shoulder Mode button allows the WT-4000 Series
Room Thermostat to be placed into a shallow setback mode. When the room thermostat is activated, it does not use HVAC equipment as long as the temperature is within the Shoulder Mode configured setpoint limits
(default ±5F° [±3C°]).
For example, with a setpoint of 70°F (21°C) and the
Shoulder Mode activated, the room thermostat does not turn the HVAC equipment on as long as the room temperature is between 65 and 75°F (18 and 24°C).
Use the Shoulder Mode to save energy when a room or zone is vacated earlier than when the Unoccupied
Mode is scheduled to begin.
1.
Press the Shoulder button
Shoulder Mode.
to activate the
2.
The Shoulder Mode period has a limited duration; the room thermostat goes back to its regularly scheduled mode at the next scheduled Unoccupied
Mode change.
3.
Press the Shoulder button the Occupied Mode.
again to return to
Configuration
The following steps describe pre-installation, device-level configuration.
Room Thermostat Configuration Mode
1.
Bend the four locking tabs on the wallplate outward to separate the wallplate from the room thermostat.
2.
Install the four 3.6 V lithium batteries included with the room thermostat into the battery compartment.
Be sure to match the positive (+) battery ends with the positive (+) battery terminals in the battery compartment.
3.
Once powered up, the room thermostat initializes in: a.
30 seconds if the room thermostat can connect to a network.
b.
3 minutes if a network is not present.
IMPORTANT: Do not press any buttons during the initialization process. Configuration changes made during initialization are not saved.
Figure 2 illustrates the LCD during room
thermostat initialization.
4.
Press and hold the Shoulder button and the
Override button simultaneously for
6 seconds to set the room thermostat in the
Configuration Mode. Initially, the LCD changes to
the firmware version screen (Figure 5), and then
after 10 seconds the configuration menu appears
5.
Use the Up/Down buttons to navigate through the room thermostat menu. All further configuration settings must be made while in the Configuration
Mode.
Note: If the configuration screen is left idle for
10 seconds, it returns to the normal operation screen.
DF: Display Firmware Number
RF: Radio Module Firmware Number
CH: Radio Channel Number
GI: Device Network Group ID
DI: Unique Thermostat Device ID
Firmware
DF 0. 3. 37
RF 1. 16. 14
CH 11
GI 111.111
DI 71.40
Figure 5: WT-4000 Series Room Thermostat Firmware Version Screen
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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Net Config Screen
1.
While in the Configuration Mode, press the
Up/Down buttons to select the Net Config option
Mesh
Net Config
Fan Mode
Standalone
Maintenance
Figure 6: Selecting Net Config
Maintenance – Pneumatic Settings
1.
While in the Configuration Mode, press the
Up/Down buttons to select the Maintenance option
Mesh
Net Config
Fan Mode
Standalone
Maintenance
Figure 8: Selecting Maintenance
2.
Press to confirm the selection.
3.
Press the Up/Down buttons to select CH to change the radio channel number, GI to change the device network group ID, and DI to change the unique
thermostat device ID (Figure 7).
Network
Information
CH 11
GI 111.111
DI 71.40
Figure 7: Selecting CH, GI, or DI
2.
Press to confirm the selection.
3.
Press the Up/Down buttons to select the
Dir Acting, SP Psi, Gain, Prop Bnd, or Unoc Psi
Dir Acting
SP Psi
Gain
Prop Bnd
Unoc Psi
9.0
0.0
Figure 9: Selecting the Pneumatic Settings
4.
Press to confirm the selection. The LCD returns to the normal operation screen, and the settings are effective immediately.
4.
Press to edit the selected option, which is highlighted on the menu.
5.
Change the direction as desired (Figure 10).
Dir Acting
SP Psi
Prop Bnd
Unoc Psi
0.0
Figure 10: Changing the Direction
a.
Press the Up button acting (Dir Acting).
+
to enable direct b.
Press the Down button acting (Rev Acting).
-
to enable reverse
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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6.
Press to confirm the selection.
7.
Change the setpoint pressure as desired
Dir Acting
SP Psi
Gain
Prop Bnd
Unoc Psi
9.0
0.0
Figure 11: Changing the Setpoint Pressure
11. Change the proportional band – proportional
range/throttling range as desired (Figure 13).
Dir Acting
SP Psi
Gain
Prop Bnd
Unoc Psi
9.0
0.0
Figure 13: Changing the Proportional Band –
Proportional Range/Throttling Range
a.
Press the Up button
+
to increase the branch line pressure at setpoint. The valid range is 1 to 22 psig (7 to 152 kPa), adjustable in increments of 0.5 psig (3 kPa). The default setting is 9 psig (62 kPa).
b.
Press the Down button
-
to decrease the branch line pressure at setpoint.
8.
Press to confirm the selection.
9.
Change the gain/sensitivity as desired
Dir Acting
SP Psi
Prop Bnd
Unoc Psi 0.0
Figure 12: Changing the Gain/Sensitivity
a.
Press the Up button
+
to increase the proportional band – proportional range/ throttling range. The valid range is 0 to 10F°
(0 to 6C°), adjustable in increments of 1F°
(0.6C°). The default setting is 6F° (3.6C°).
b.
Press the Down button
-
to decrease the proportional band – proportional range/ throttling range.
12. Press to confirm the selection.
13. Change the unoccupied mode pressure as
Dir Acting
SP Psi
Prop Bnd
Unoc Psi 0.0
Figure 14: Changing the Unoccupied Mode
Pressure
a.
Press the Up button
+
to increase the gain/sensitivity. The valid range is 1 to 5 psi/F°
(13 to 65 kPa/C°), adjustable in increments of
0.5 psig (3 kPa). The default setting is 2 psi/F°
(26 kPa/C°).
b.
Press the Down button gain/sensitivity.
-
to decrease the
10. Press to confirm the selection.
a.
Press the Up button
+
to increase the branch line pressure during Unoccupied Mode periods. The valid range is 0 to 22 psig (0 to
152 kPa), adjustable in increments of 0.5 psig
(3 kPa). The default setting is 0 psig (0 kPa).
b.
Press the Down button
-
to decrease the branch line pressure during Unoccupied Mode periods.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
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14. Press to confirm the selection.
15. Press to go back to the previous screen button when done.
Note: If the configuration screen is left idle for
10 seconds, it returns to the normal operation screen.
Commissioning
Table 2 includes a list of configurable settings that
define how WT-4000 Series Room Thermostat pneumatic pressure commands correlate with the temperature values. Refer to the HVAC equipment documentation or service personnel for the actual values that should be configured on the room thermostat.
Table 2: WT-4000 Series Room Thermostat Configurable Settings
Settings Details Range Increments System
Defaults
Net Config
Direction
Setpoint, psig (kPa)
Gain/
Sensitivity
Proportional
Band –
Proportional
Range/
Throttling
Range
Unoccupied
Mode, psig (kPa)
Operational
CH – to change the radio channel number 11 through 26
GI – to change the device network group ID Two fields separated by a period; both fields are 1 through 255
DI – to change the unique thermostat device ID Two fields separated by a period; first field is 1 through 159, and second field is
1 through 246
Pneumatic
Direct acting – branch line pressure increase turns on cooling; decrease turns on heating
N/A
Reverse acting – branch line pressure increase turns on heating; decrease turns on cooling
Branch line pressure when the room temperature and setpoint are equal (heating and cooling outputs are off)
Branch line pressure change needed to change the room temperature by 1F° (0.6C°)
Temperature range that represents movement of the controlled device from fully closed to fully open; typically 6F° (3.6C°) or 4 psi (28 kPa)
Branch line pressure during the Unoccupied
Mode (heating and cooling outputs are off)
1 to 22 psig
(7 to 152 kPa)
1 to 5 psi/F°
(13 to 65 kPa/C°)
0 to 10F°
(0 to 6C°)
0 to 22 psig
(0 to 152 kPa)
1
1
1
N/A
0.5 psig
(3 kPa)
0.5 psig
(3 kPa)
1F°
(0.6C°)
0.5 psig
(3 kPa)
11
111.111
71.40
Direct acting
9 psig
(62 kPa)
2 psi/F°
(26 kPa/C°)
6F°
(3.6C°)
0 psig
(0 kPa)
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
12
Operation
The WT-4000 Series Pneumatic-to-DDC Room
Thermostats are regulated by a number of operational modes that can be triggered by inputs such as changes in inside and outside environments, data received from other sensing devices, and scheduled times. Each mode is designed to optimize energy use under certain conditions, and has a set of rules that manages operation of HVAC equipment and restricts local room thermostat requests.
The two types of operational modes are scheduled and manual. Scheduled modes are triggered by occupancy schedules, and provide energy savings by aligning the operation of HVAC equipment to the actual building occupancy. Manual modes are initiated by the user at the room thermostat level, and adjust the operation of
HVAC equipment manually outside of the schedule, but within set energy policy parameters.
The WT-4000 Series Room Thermostats are designed to support any 0 to 22 psig (0 to 152 kPa) pneumatic
HVAC control system. Variation in branch line pressure is proportional to the deviation of room temperature from the setpoint. The proportional factor is determined by the gain/sensitivity, which is defined as the change in branch line pressure in psi (kPa) in response to a 1F°
(0.6C°) change in room temperature.
Figure 15 illustrates the linear relationship between
branch line pressure and room temperature, at a given setpoint for a Direct Acting (DA) room thermostat configuration. For a Reverse Acting (RA) room thermostat configuration, the graph is inverted horizontally.
Gain/
Sensitivity
Setpoint
Pressure
Half of the
Proportional Band
Set-
Point
Half of the
Proportional Band
Temperature, °F (°C)
1F°
(0.6C°)
Dead Zone
±1F° (±0.6C°)
Figure 15: Branch Line Pressure vs. Room Temperature
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
13
In a DA room thermostat configuration, the branch line pressure increases in response to an increase in room temperature. When the room temperature is within the
±1F° (±0.6C°) dead zone around the setpoint, the branch line pressure is regulated at the setpoint pressure, and the pneumatic actuator is at the minimum heat (cool or neutral) position.
When the room temperature rises above the setpoint plus the dead zone, the branch line pressure increases proportionally to the increase in temperature. The proportional factor is defined by the gain/sensitivity value.
When the room temperature decreases below the setpoint minus the dead zone, the branch line pressure decreases proportionally to the decrease in temperature. The proportional band defines the temperature range, where the branch line pressure changes proportionally to the change in temperature.
Note: The setpoint pressure, dead zone, gain/sensitivity, and proportional band are adjusted using the menu buttons on the WT-4000 Series Room
Thermostat.
Wireless Operation
The WT-4000 Series Pneumatic-to-DDC Room
Thermostats are designed to monitor and control pneumatic HVAC systems. The room thermostats are equipped with a 2.4 GHz IEEE 802.15.4 radio that communicates via a wireless mesh network. The wireless mesh network forms itself, and data communications enable remote monitoring, adjustment, and trending to provide longer and more dependable and maintenance-free operation.
Note: For each room thermostat in the wireless mesh network, only one object can be written at a time, and the next object cannot be written for at least 5 minutes.
In a wireless mesh network, the room thermostat operates as a battery-powered end node. Being an end node, the room thermostat does not operate as a router to relay data for other devices in the mesh network.
Instead, the room thermostat communicates with the wireless mesh network as an individual device that transmits and receives its own data only, to and from the WT-BAC-IP Gateway or through other
WT-ROUTER Routers.
During wireless operation, an antenna icon appears in the upper-right corner of the LCD when the room thermostat communicates with the wireless mesh
network (Figure 16). The number below the antenna
icon represents the number of devices that the room thermostat can communicate with. It is desirable that the room thermostat have two devices it can communicate with. With two devices, if one communication link fails, then the other communication link can be used without delaying any transmissions.
Figure 16: LCD during Wireless Communication
When the room thermostat is installed in buildings with common sheetrock walls, the nominal radio communication range of the room thermostat is approximately 200 ft (61 m). If the room thermostat is located more than 200 ft (61 m) from the WT-BAC-IP
Gateway, then WT-ROUTER Routers must be installed to relay data generated by the room thermostat back to the WT-BAC-IP Gateway.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
14
Stand-Alone Operation
Stand-Alone Room Thermostat Occupancy
Programming
The WT-4000 Series Room Thermostats can operate as stand-alone pneumatic-to-DDC room thermostats with an independent time clock, and can be programmed with a Weekday/Weekend occupancy schedule.
During stand-alone operation, a person icon appears in
the upper-right corner of the LCD (Figure 17). When
the room thermostat is powered up for the first time, the number 1024 appears on the bottom of the LCD indicating that the time and date need to be set before the device can operate according to the occupancy schedule.
Figure 17: LCD during Stand-Alone Operation
A complete 7-day schedule consists of two independent components:
• Weekday Schedule – Monday through Friday
• Weekend Schedule – Saturday through Sunday
Each component is split into two parts to be scheduled as Occupied or Unoccupied Mode:
• Weekday 1
• Weekday 2
• Weekend 1
• Weekend 2
Each part can be configured to Occupied or
Unoccupied Mode independently, to accommodate for daytime or nighttime shift schedules.
For each Occupied Mode, the following features can be configured:
• Occupied Mode start time
• Temperature setpoint range – adjustable ±14F°
(±8.4C°) by the room occupants
For each Unoccupied Mode, the following features can be configured:
• Unoccupied Mode start time
• Upper temperature limit
• Lower temperature limit – the room thermostat is off while the room temperature is within these limits
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
15
The start time of each schedule part is automatically the end time of the previous schedule part. For example, when the occupied schedule is 6 A.M. to
6 P.M., the Occupied Mode starts at 6 A.M. and the
Unoccupied Mode starts at 6 P.M. Figure 18 and
Figure 19 illustrate the Occupied and Unoccupied
Mode schedule setup.
Occupied or Unoccupied
(Defines the occupancy mode of the part.)
Setpoint Temperature
(Defines the Occupied Mode setpoint temperature of the part.)
Weekday 1
70
Occupied
07:00
Weekday 1, Weekday 2,
Weekend 1, or Weekend 2
(Defines which part is being edited.)
Time in 24-Hour Format
(Defines the start time of the part.)
Figure 18: WT-4000 Series Pneumatic-to-DDC Room Thermostat
Schedule Setup Screen for Occupied Mode
Occupied or Unoccupied
(Defines the occupancy mode of the part.)
Upper Temperature Limit
(Defines the Unoccupied Mode upper temperature limit of the part.)
Weekday 2
Unoccupied
18:00
85 55
Weekday 1, Weekday 2,
Weekend 1, or Weekend 2
(Defines which part is being edited.)
Time in 24-Hour Format
(Defines the start time of the part.)
Lower Temperature Limit
(Defines the Unoccupied Mode lower temperature limit of the part.)
Figure 19: WT-4000 Series Pneumatic-to-DDC Room Thermostat
Schedule Setup Screen for Unoccupied Mode
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
16
Configuring the Room Thermostat for Stand-Alone
Operation
The WT-4000 Series Room Thermostats can be configured in the field for stand-alone applications.
1.
Press and hold the Shoulder button and the
Override button
6 seconds.
simultaneously for at least
2.
Press the Down button
-
to enter the menu, then press the press the Up button
+
to select
Stand-Alone Room Thermostat Configuration
To set the time and program the stand-alone room thermostat occupancy schedule and temperature setpoints:
1.
Press and hold the Shoulder button and the
Override button simultaneously for
10 seconds to set the room thermostat in the
Configuration Mode. Initially, the LCD changes to the firmware version screen, and then after
10 seconds the configuration menu appears.
Confirm that the first line in the configuration menu shows Standalone; if it indicates Mesh, switch to
a.
Press the Up button
+
.
Mesh
Net Config
Fan Mode
Standalone
Maintenance
Figure 20: Selecting Mesh
b.
c.
Press to select.
Press the Up button
-
+
to change the value.
or the Down button d.
Press to confirm the selection.
3.
Press to confirm the selection.
4.
Press the Down button on the menu.
-
to select Standalone
5.
Press to confirm the selection.
6.
Press to return to the main screen. After the room thermostat resets, a person icon appears in the upper-right corner of the LCD indicating stand-alone operation.
Standalone
Net Config
Fan Mode
Standalone
Maintenance
Figure 21: Stand-Alone Menu
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
17
2.
Use the Up/Down buttons to select Standalone on
Standalone
Net Config
Fan Mode
Standalone
Maintenance
Figure 22: Selecting the Stand-Alone Mode
3.
Press to confirm the selection.
4.
Select Date & Time on the menu (Figure 23) and
press to enter the setup screen.
Weekday
Weekend
Figure 23: Selecting Date and Time
7.
Press to confirm the selection.
8.
Repeat Step 5 through Step 7 until all of the menu
options are configured correctly. Press the Up button
+
or the Down button
-
to scroll through the date and time menu options.
9.
While in the configuration menu, use the Up/Down buttons to navigate to Weekday to program the weekday schedule.
10. Press to open the weekday schedule.
11. Set the Weekday 1 schedule (Figure 25), which is
usually the start of the Occupied Mode.
Weekday 1
Occupied
07:00
70
Figure 25: Setting the Weekday 1 Schedule
5.
In the Date & Time menu (Figure 24), press
to highlight the menu options that require editing.
Year 2014
Minute 01
Figure 24: Setting the Date and Time
a.
Leave the top line as Weekday 1.
b.
Press the Up button
+
or the Down button
-
to scroll through the occupancy mode, start time, and lower temperature limit menu items.
c.
Press to open a specific menu item.
d.
Press the Up button
+
or the Down button
-
to change the value, then press save the setting.
to
6.
Press the Up button
+
or the Down button
-
to change the value.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
18
12. Set the Weekday 2 schedule (Figure 26).
Figure 26: Setting the Weekday 2 Schedule
a.
Press the Up button
+
or the Down button
-
to navigate to Weekday 1.
b.
Press c.
Press the Up button
+
or the Down button
-
to change the selection to Weekday 2.
d.
Press
Weekday 2
Unoccupied
18:00
85 55
to highlight the selection.
to save the setting.
f.
Press to open a specific menu item.
g.
Press the Up button
+
or the Down button
-
to change the value, then press save the setting.
to
13. While in the configuration menu, use the Up/Down
buttons to navigate to Weekend (Figure 27).
Standalone
Weekday
Weekend
Figure 27: Selecting Weekend
14. Program the weekend schedule in a similar manner as the weekday schedule.
15. Once all programming is complete, press exit the Configuration Mode.
to e.
Press the Up button
+
or the Down button
-
to scroll through the occupancy mode, start time, upper temperature limit, and lower temperature limit menu items.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
19
Occupancy Programming Example – Standard
Office Hours
• Setpoint: 70°F
• Occupied from 9 A.M. to 5 P.M., Monday through
Friday
• Saturday and Sunday: Unoccupied, Upper Limit is
85°F, Lower Limit is 55°F
Program the WT-4000 Series Room Thermostat
schedule setup screens as illustrated in Figure 28.
Weekday 1
Weekday 2
Weekend 1 Weekend 2
Occupied
Unoccupied Unoccupied
09:00 17:00
09:00*
70
85 55
85
55
85
* The start and end times are irrelevant, since both weekend parts are set to the same unoccupied mode.
17:00*
55
Figure 28: Occupancy Programming Schedule;
Standard Office Hours
Occupancy Programming Example – Night Shift
Hours
• Setpoint: 70°F
• Occupied from 3 P.M. to 6 A.M., Monday through
Sunday
Program the WT-4000 Series Room Thermostat
schedule setup screen as illustrated in Figure 29.
85
06:00
55
70
Occupied
Weekend 1
Unoccupied
06:00
85
55
Figure 29: Occupancy Programming Schedule;
Night Shift Hours
Weekend 2
Occupied
15:00
70
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
20
Occupancy Programming Example – Extended
Office Hours with Weekend Schedule
• Setpoint: 70°F
• Occupied from 8 A.M. to 6 P.M., Monday through
Friday
• Occupied from 10 A.M. to 1 P.M., Saturday and
Sunday
Program the WT-4000 Series Room Thermostat
schedule setup screen as illustrated in Figure 30.
Weekday 1
Occupied
08:00
70
Weekday 2
Unoccupied
85
18:00
55
Weekend 1
Occupied
10:00
70
Figure 30: Occupancy Programming Schedule;
Extended Office Hours with Weekend Schedule
2
Unoccupied
85
13:00
55
Room Thermostat Operational Modes
Scheduled Modes
Scheduled WT-4000 Series Pneumatic-to-DDC Room
Thermostat operational modes are regulated by the
HVAC schedules, as defined by the user. The HVAC schedules can be set in advance through the building automation system for wireless communicating models, and locally at each room thermostat for stand-alone models. The room thermostat executes the HVAC schedules automatically.
Occupied Mode
Use the Occupied Mode when the room is scheduled to be occupied. During the Occupied Mode, the room temperature is defined by two values set by the room thermostat configuration parameters:
• Setpoint – the targeted room temperature for the season
• Comfort Zone – the optimal temperature range around the setpoint
The room thermostat maintains the room temperature within the Comfort Zone. If the room temperature falls outside of the range of the Comfort Zone, the room thermostat reacts accordingly and automatically requests heating or cooling.
The room thermostat allows users to adjust the room temperature using the local room thermostat, as long as the desired room temperature is within the range of the Comfort Zone. If the user requests heating or cooling outside of the range of the Comfort Zone, the request at the local room thermostat is overwritten by the room thermostat configuration parameters.
Example: The setpoint temperature is 70°F (21°C) and the range of the Comfort Zone is ±3F° (±1.8C°) around the setpoint temperature. The user is manually able to affect the room temperature only between 67 and 73°F
(19 and 23°C), regardless of the temperature requested on the LCD of the local room thermostat.
Stand-alone room thermostats do not feature a configurable Comfort Zone. Instead, stand-alone models have a factory set range of ±14F° (±8.4C°) around the installer-configured setpoint temperature in the Occupied Mode.
Unoccupied Mode
Use the Unoccupied Mode to save energy during those times when a room is unoccupied. The room thermostat does not call for heating or cooling when the room temperature is within the upper and lower
Unoccupied Mode temperature limits. If the room temperature falls outside of the upper and lower
Unoccupied Mode temperature limits, the room thermostat calls for heating or cooling to bring the room temperature back within the Unoccupied Mode upper and lower temperature limits.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
21
Manual Modes
The following manual modes cannot be scheduled or triggered remotely. Instead, these manual modes can only be initiated locally via user interface with the room thermostat. All parameter-defining rules of each mode
are configurable; see Table 3.
Override Mode
Press the Override button on the room thermostat to initiate the Override Mode. The Override
Mode has a limited duration time, set by the room thermostat configuration parameters. After the
Override Mode expires, the room thermostat returns to its regularly scheduled mode.
The Override Mode overrides the scheduled Occupied
Mode or Unoccupied Mode by allowing the user to control the HVAC system through the local thermostat, and it permits a wider Comfort Zone range. If the room temperature is outside the Override Comfort Zone range, the room thermostat disables the local thermostat controls.
The Override Mode Comfort Zone range and the
Override Mode duration time are set by the room
thermostat configuration parameters; see Table 3.
Shoulder Mode
Press the Shoulder button on the WT-4000
Series Room Thermostat to initiate the energy saving transition from the Occupied Mode to the Unoccupied
Mode. While in the Shoulder Mode, the room thermostat does not call for heating or cooling when the room temperature is between the upper and lower
Shoulder Mode Comfort Zone temperature limits.
Use the Shoulder Mode to manually set back the room temperature setpoint if occupants leave the facility earlier than the scheduled time. Doing so essentially overrides the current schedule, until the next scheduled mode change occurs. For example, when the zone is running a 5-day, 8 A.M. to 6 P.M. occupancy schedule but one day the occupants are leaving at 2 P.M., the zone can be manually set into Shoulder Mode at 2 P.M.
The room thermostat remains in Shoulder Mode until
6 P.M., at which time it follows its regular schedule again.
The upper and lower Shoulder Mode Comfort Zone temperature limits are set by the room thermostat
configuration parameters; see Table 3.
Note: The Shoulder Mode can also be used as a
Demand Response Mode, which can be triggered remotely from the monitoring and control application.
Fail-Safe Features
The WT-4000 Series Pneumatic-to-DDC Room
Thermostats have a number of programmed fail-safe features that ensure continuous HVAC operation. In the event of a communication failure with the
WT-BAC-IP Gateway, the wireless network, or the
HVAC equipment, a fail-safe mechanism ensures that the devices continue to operate in logical fashion. Once the failure condition no longer exists, the devices recover from fail-safe mode and resume normal operation.
Loss of Radio Communication with Site Controller
If the room thermostat experiences radio communication failure with the WT-BAC-IP Gateway, the room thermostat automatically goes into the
Occupied Mode. When the room thermostat regains communication with the WT-BAC-IP Gateway, the room thermostat automatically receives updated mode status, setpoint values, and other configuration commands based on the latest user schedule.
Protection Zone
To protect building infrastructure, equipment, and occupants, the room thermostat has extreme temperature limits (configurable by the user) that allow temperatures to float independently from any mode settings. If these temperature limits are reached, the room thermostat automatically reacts and adjusts heating or cooling despite what scheduled mode is running. The protection zone default value for the upper temperature limit is 95°F (35°C) and the lower temperature limit is 40°F (4°C).
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
22
WT-4000 Series Pneumatic-to-DDC Room
Thermostat Configuration Parameters
The variables included in Table 3 define the
WT-4000 Series Pneumatic-to-DDC Room Thermostat configuration parameters and regulate room thermostat operation.
Table 3: WT-4000 Series Room Thermostat Configuration Parameters (Part 1 of 2)
Parameter Description Configuration
Method
Occupied Mode
Setpoint value
Comfort Zone upper delta; default = 3F° (1.8C°)
Comfort Zone lower delta; default = 3F° (1.8C°)
Unoccupied Mode
Constrained float upper limit; default = 85°F (29°C)
Constrained float lower limit; default = 55°F (13°C)
Zone setpoint temperature
Upper temperature bound on deviation from configuration parameters setpoint during Occupied Mode
Lower temperature bound on deviation from parameter setpoint during Occupied Mode
Configuration tool
Configuration tool
Configuration tool
Defines upper temperature limit in Unoccupied Mode;
HVAC equipment remains off while the zone temperature is between the upper and lower limits
Defines lower temperature limit in Unoccupied Mode;
HVAC equipment remains off while zone temperature is between the upper and lower limits
Configuration tool
Configuration tool
Override Mode
Override duration; default = 120 minutes
Room thermostat override duration (240 minute maximum duration); after time limit expires, room thermostat goes into regularly scheduled mode
Comfort Zone upper delta during Override Mode
Configuration tool
Configuration tool Override Mode
Comfort Zone upper delta; default = 14F° (8.4C°)
Override Mode
Comfort Zone lower delta; default = 14F° (8.4C°)
Other Parameters
Network configuration
(Net Config)
Comfort Zone lower delta during override Mode Configuration tool
Operational modes
Dead zone delta; default = 1F° (0.6C°)
Room thermostat protection zone – upper limit; default = 95°F (35°C)
Room thermostat protection zone – lower limit; default = 40°F (4°C)
Default Occupied Mode start time in the event of wireless communication failure; default = 06:00 A.M.
CH: To change the radio channel number; default = 11
GI: To change the device network group ID; default = 111.111
DI: To change the unique thermostat device ID; default = 71.40
1: Occupied
2: Unoccupied
Temperature range around setpoint, to prevent HVAC from chattering
Maximum temperature allowed in zone; fail-safe feature applicable to all zones
Configuration tool, room thermostat
Factory configured
Configuration tool
Factory configured
Minimum temperature allowed in zone; fail-safe feature applicable to all zones
Time of day (0 to 24 hours) in the event the room thermostat goes offline for an extended duration
Factory configured
Factory configured
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
23
Table 3: WT-4000 Series Room Thermostat Configuration Parameters (Part 2 of 2)
Parameter Description
Temperature used in the event the room thermostat goes offline for an extended duration
Configuration
Method
Factory configured Default Occupied Mode setpoint value in the event of wireless communication failure; default = 70°F (21°C)
Default Unoccupied Mode setpoint start time in the event of wireless communication failure
Temperature sensor calibration factor; °F (°C)
Shoulder Mode Comfort Zone upper delta
Shoulder Mode Comfort Zone lower delta
Direction
Time of day (0 to 24 hours) in the event the room thermostat goes offline for an extended duration; disabled in default configuration; therefore, device does not go into Unoccupied
Mode when offline
Calibrates the room thermostat temperature sensor for offset compensation
Defines upper temperature limit in Shoulder Mode
Defines lower temperature limit in Shoulder Mode
Factory configured
Factory configured
Configuration tool
Configuration tool
Configuration tool, room thermostat
Setpoint psig
Gain/sensitivity
Proportional band – proportional range/throttling range
Unoccupied Mode psig
Direct acting – branch line pressure increase turns on cooling; decrease turns on heating
Reverse acting – branch line pressure increase turns on heating; decrease turns on cooling
Branch line pressure when room temperature and setpoint are equal (no heating or cooling outputs)
Branch line pressure change needed to change the room temperature by 1F° (0.6C°)
Temperature range that represents the controlled device’s movement from fully closed to fully open; typically 4F° (2.4C°) or 6F° (3.6C°)
Branch line pressure during Unoccupied Mode when zone temperature is within unoccupied constrained upper and lower limits
Configuration tool, room thermostat
Configuration tool, room thermostat
Configuration tool, room thermostat
Configuration tool, room thermostat
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
24
Table 4: WT-4000 Series Room Thermostat Point Mapping (Part 1 of 3)
Object Name
1 Description BACnet®
Type
Read/Write or
Read-Only
More Information
WT_4000_xxx_av_5
WT_4000_xxx_av_7
WT_4000_xxx_av_8
WT_4000_xxx_av_9
WT_4000_xxx_av_10
WT_4000_xxx_av_11
WT_4000_xxx_av_12
WT_4000_xxx_av_13
WT_4000_xxx_av_14
WT_4000_xxx_av_15
WT_4000_xxx_av_16
WT_4000_xxx_av_18
WT_4000_xxx_av_31_Byte_H
WT_4000_xxx_av_31_Byte_L
Mode = 1-Occ:
2-Unocc: 7-Shoulder
Comfort upper delta
Comfort lower delta
Heat/Cool delta
Constrained upper delta
Constrained lower delta
Maximum protection temperature
Minimum protection temperature
Override timer maximum
Override upper delta
Override lower delta
Heat/Cool dead zone delta
Setback upper delta
Setback lower delta
AV
AV
AV
AV
AV
AV
AV
AV
AV
AV
AV
AV
AV
AV
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Mode being requested by schedule
1 = Occupied
2 = Constrained float (Unoccupied)
3 to 6: Reserved
7 = Shoulder Mode (shallow setback, also used
in demand response events)
The value represents delta value in °F (°C) multiplied by 10 (BACnet object shows actual value); default 3°F (1.8°C); maximum comfort zone is 14°F (8.4°C)
The value represents delta value in °F (°C) multiplied by 10 (BACnet object shows actual value); default 3°F (1.8°C); maximum comfort zone is 14°F (8.4°C)
Temperature delta in °F (°C) multiplied by 10 before transitioning from heating to cooling or cooling to heating (BACnet object shows actual value); default 0°F (0°C)
Default Unoccupied Mode; defines the upper temperature limit in constrained Unoccupied
Mode; value represents limit in °F (°C) multiplied by 10 (BACnet object shows actual value); default 85°F (29°C)
Default Unoccupied Mode; defines the lower temperature limit in constrained Unoccupied
Mode; value represents limit in °F (°C) multiplied by 10 (BACnet object shows actual value); default 55°F (13°C)
Maximum temperature allowed in zone multiplied by 10 (BACnet object shows actual value); default 90°F (32°C)
Minimum temperature allowed in zone multiplied by 10 (BACnet object shows actual value); default 50°F (10°C)
Maximum 240 minutes; in increments of
1 minute
Comfort Zone upper delta during Override Mode, in °F multiplied by 10 (BACnet object shows actual value); default 5°F (3°C)
Comfort Zone lower delta during Override Mode, in °F (°C) multiplied by 10 (BACnet object shows actual value); default 5°F (3°C)
Temperature control dead zone in °F (°C) multiplied by 10 (BACnet object shows actual value); default 1°F (0.6°C)
Shoulder Mode is used for shallow setback (as opposed to constrained float for deep setback); it is also the mode used in a demand response event; high byte indicates upper delta, in °F (°C) multiplied by 10, relative to setpoint (BACnet object shows actual value); device does not call for cooling if room temperature is below setpoint plus upper delta in Shoulder Mode
Low byte indicates lower delta, in °F (°C) multiplied by 10, relative to setpoint (BACnet object shows actual value); device does not call for heating if room temperature is above setpoint minus lower delta
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
25
Table 4: WT-4000 Series Room Thermostat Point Mapping (Part 2 of 3)
Object Name
1 Description BACnet®
Type
Read/Write or
Read-Only
More Information
WT_4000_xxx_av_33
WT_4000_xxx_ai_54
Display mode AV
AI
Read/write
Read-only
0 = Normal LCD and button functionality
1 = No temperature display; buttons are disabled
2 = Normal LCD functionality; buttons are
disabled
Note:
Display mode set to any other value results in normal LCD and button functionality; this feature is not supported for stand-alone models.
High 16 bits of 32 bit UTC time (UNIX epoch time)
WT_4000_xxx_ai_55
WT_4000_xxx_ai_57
High 16 bits of standard 32 bits
UTC time
Low 16 bits of standard 32 bits
UTC time
Zone temperature
AI
AI
Read-only
Read-only
Low 16 bits of 32 bit UTC time
WT_4000_xxx_ai_58_Byte_H
WT_4000_xxx_ai_58_Byte_L
WT_4000_xxx_bi_59_Bit_0
WT_4000_xxx_bi_59_Bit_1
WT_4000_xxx_bi_59_Bit_6
Branch line pressure requested
Branch line pressure measured
Heating status
Cooling status
AI
AI
BI
BI
BI
Read-only
Read-only
Read-only
Read-only
Read-only
Temperature value in degree F multiplied by 10
(BACnet object shows actual value)
High byte indicates pressure requested by the unit based on temperature measurement, in psig
(kPa) multiplied by 10 (BACnet object shows actual value)
Low byte represents actual branch line pressure measured by the pressure sensor, in psig (kPa) multiplied by 10 (BACnet object shows actual value)
Active = heating on (branch line pressure in
heating zone)
Active = cooling on (branch line pressure in
cooling zone)
Active = Override Mode button pressed
WT_4000_xxx_bi_59_Bit_7
WT_4000_xxx_bi_59_Bit_10
Override button pressed
Setback button pressed
Occupancy sensor
Shoulder Mode
BI
BI
Read-only
Read-only
Active = Shoulder Mode button pressed
WT_4000_xxx_ai_60
WT_4000_xxx_av_61
WT_4000_xxx_ai_62
WT_4000_xxx_av_69
WT_4000_xxx_av_70_Byte_H
Mode = 1-Occ:
2-Unocc: 7-Shoulder
Zone temperature setpoint - system
Zone temperature setpoint - user
Setpoint pressure
Action direction
AI
AV
AI
AV
AV
Read-only
Read/write
Read-only
Read/write
Read/write
Active = in Shoulder Setback Mode (no motion
detected for 30 minutes)
Inactive = in Occupied Mode
Note:
Supply air must be provided to the room thermostat for this feature to be functional.
This register represents the mode that the unit is currently in.
1 = Occupied
2 = Constrained float (Unoccupied)
3 to 6: Reserved
7 = Shoulder Mode
This register represents setpoint specified by energy management application, in °F (°C) multiplied by 10 (BACnet object shows actual value); default 70°F (21°C)
This register represents setpoint specified by pressing Up/Down buttons on the unit, in °F (°C) multiplied by 10 (BACnet object shows actual value); default 70°F (21°C)
The pressure when temperature is at setpoint value, in psig (kPa) multiplied by 10 (BACnet object shows actual value); valid range 1 to
22 psig (7 to 152 kPa); default 9 psig (62 kPa)
High byte shows action direction:
0 = direct acting (default)
1 = reverse acting
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
26
Table 4: WT-4000 Series Room Thermostat Point Mapping (Part 3 of 3)
Object Name
1 Description BACnet®
Type
Read/Write or
Read-Only
More Information
WT_4000_xxx_av_70_Byte_L
WT_4000_xxx_av_71
WT_4000_xxx_av_72
WT_4000_xxx_ai_73
WT_4000_xxx_ai_201
WT_4000_xxx_ai_204_Byte_H
WT_4000_xxx_ai_204_Byte_L
WT_4000_xxx_ai_510
Pressure gain/sensitivity
Temperature proportional band
Unoccupied Mode pressure
Insufficient pressure value
Hop count
Radio received signal strength
Battery voltage
AV
AV
AV
AI
AI
AI
AI
Device type identifier AI
Read/write
Read/write
Read/write
Read-only
Read-only
Read-only
Read-only
Read-only
Low byte shows gain/sensitivity, which indicates change in branch line pressure in psig (kPa) multiplied by 10 (BACnet object shows actual value) in response to per 1F° (0.6C°) change in temperature; valid range 1 to 5 psi/F° (13 to
65 kPa/C°), default 2 psi/F° (26 kPa/C°)
Temperature range in °F (°C) multiplied by 10
(BACnet object shows actual value) where pressure changes in proportion to temperature change; valid range 0 to 10F° (0 to 6C°); default
6F° (3.6C°)
Pressure when the room thermostat is in the
Unoccupied Mode and within the temperature constrained float limits, in psig (kPa) multiplied by 10 (BACnet object shows actual value)
In the case where Error Reporting Register indicates insufficient pressure error, this register holds the maximum branch pressure of the system at that time, in psig (kPa) multiplied by 10 (BACnet object shows actual value).
This register shows the number of hops that the device’s data is routed through to reach the
WT-BAC-IP Gateway. If this value is shown as
65535, the device is either offline or the
batteries are dead.
High byte indicates radio received signal strength (RSSI)
Low byte: battery voltage level in VDC multiplied by 10 (BACnet object shows actual value)
This register holds an integer value that identifies the device type in the wireless mesh network; not for customer applications.
1.
For each WT-4000 Series Room Thermostat in the wireless mesh network, only one object can be written at a time, and the next object cannot be written for at least 5 minutes.
Repair Information
If the WT-4000 Series Pneumatic-to-DDC Room
Thermostat fails to operate within its specifications, replace the unit. For a replacement room thermostat, contact the nearest Johnson Controls representative.
Technical Specifications
WT-4000 Series Pneumatic-to-DDC Room Thermostats (Part 1 of 2)
Thermostat Type
Two-pipe
Control Action
Temperature Element Type
Air Connections
Gain/Sensitivity
Flow Capacity
Air Consumption
Supply Pressure
DA/RA dual control action
Advanced piezoelectric air valve
Dual barbed fittings for 5/32 or 1/4 in. (4 or 6 mm) O.D. polytubing
Adjustable from 1 to 5 psi/F° (13 to 65 kPa/C°); factory set at approximately 2 psi/F° (26 kPa/C°)
699 scim (191 mL/s) at 14 psig (96 kPa)
None
Range: 12 to 18 psig (83 to 124 kPa) nominal; 30 psig (207 kPa) maximum
Note: The air supply must be clean, dry, and oil-free.
Accuracy: 1.5% of full scale
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
27
WT-4000 Series Pneumatic-to-DDC Room Thermostats (Part 2 of 2)
Setpoint Range
Temperature Measurement
Power Requirements
Room Thermostat Display
Wireless Band
Operating Frequency Range
Channels
Transmissions
Ambient Conditions
Materials
Compliance
Shipping Weight
Adjustable up to ±14F° (±8.4C°); factory set at ±3F° (±1.8C°)
Range: 32 to 99°F (0 to 37°C)
Accuracy: ±1.0F° (±0.6C°)
Internal: Four 3.6 VDC, 2700mAh, Size AA lithium batteries; typical battery life up to
4 years
External: Minimum 3.1 to maximum 12 VDC via screw terminal
LCD indicates room temperature, branch line pressure, temperature setpoint, occupied/setback mode, battery voltage and wireless connection status; supports temperature setpoint adjustment, network configuration (Net Config) selection
(CH, GI, or DI), and maintenance mode selection
Direct-sequence, spread-spectrum, 2.4 GHz ISM band
2,405 to 2,475 MHz
Quantity: 15
Spacing: 5 MHz
Power: 18 dBm maximum
Rate: 250 Kbits per second
Operating: 41 to 99°F (5 to 37°C), 5 to 95% RH, noncondensing
Storage:
-
40 to 185°F (
-
40 to 85°C), 5 to 95% RH, noncondensing
White ABS plastic housing
United States:
Transmission Complies with FCC Part 15.247 Regulations for Low Power Unlicensed
Transmitters
Transmitter FCC Identification: HSW-Z2430HPA
RoHS compliant (EU Directive)
Canada:
Industry Canada IC: 4492A-Z2430HPA
0.75 lb (0.34 kg) excluding batteries and packaging
The performance specifications are nominal and conform to acceptable industry standard. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
European Single Point of Contact:
JOHNSON CONTROLS
WESTENDHOF 3
45143 ESSEN
GERMANY
NA/SA Single Point of Contact:
JOHNSON CONTROLS
507 E MICHIGAN ST
MILWAUKEE WI 53202
USA
APAC Single Point of Contact:
JOHNSON CONTROLS
C/O CONTROLS PRODUCT
MANAGEMENT
NO. 22 BLOCK D NEW DISTRICT
WUXI JIANGSU PROVINCE 214142
CHINA
Building Efficiency
507 E. Michigan Street, Milwaukee, WI 53202
Metasys® and Johnson Controls® are registered trademarks of Johnson Controls, Inc.
All other marks herein are the marks of their respective owners. © 2016 Johnson Controls, Inc.
WT-4000 Series Pneumatic-to-Direct Digital Control (DDC) Room Thermostats Installation Instructions
Published in U.S.A.
28 www.johnsoncontrols.com
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Key features
- Direct Digital Control (DDC)
- Wireless mesh networking
- Remote setpoint management
- Occupancy scheduling
- Energy savings
- Solid-state temperature sensor
- Piezoelectric air valve
- Stand-alone operation
- 7-day scheduling
