WTL Series Digital Pneumatic Thermostats User Manual

WTL Series Wireless Thermostats Quick Start Guide

BAS mode

The WTL Thermostat can be further integrated into a BAS such as Metasys or Facility Explorer through the WTL Control Server. If you connect to a BAS, you must ensure scheduling on the Control Server is turned off. Off is the default setting. When you connect the BAS to the Control Server, you can control all setpoints and scheduling with the BAS.

When setting up the WTL Thermostat scheduling through BACnet on the BAS, consider the following points:

• BAS can send an occupied setpoint or an unoccupied setpoint to each WTL.
• BAS can command the thermostat to unoccupied or occupied mode. Each WTL saves the last commanded setpoint for each mode.
• The WTL BACnet interface does not support schedule objects or groups.
• The WTL BACnet interface does not support setpoint limits, but these can be configured on the Control Server web application.

Calibrating the thermostat

Before you begin

Remove the cover of the thermostat and ensure that the thermostat is acclimatized to the ambient temperature. This may take 5 minutes to 10 minutes after you attach the thermostat to the wall.Note:

• The pneumatic main and branch lines must be connected to perform the calibration steps.
• The bimetallic spring is very sensitive to body heat. Keep your hands and your breath away from the thermostat to minimize calibration error.
• The black TR adjuster is factory set at 6°F, as marked on the lever. The factory setting provides a throttling range (TR) of 2 to 0.5 psi/°F.
• Important: To ensure correct operation and accuracy of the thermostat, do no move the TR adjuster.

About this task

To access calibration mode, complete the following steps:

Procedure

1. Press and hold Down and Confirm for 2 seconds. The screen shows dt.
2. Press Confirm until the screen shows PRESSURE. The screen shows the branch pressure in psi along with the pressure indicator. If the motor is in motion when you try to access the branch pressure the screen shows --.
3. Press and hold all buttons simultaneously to access calibration mode. The symbol °C flashes rapidly while in this mode.
4. Locate the calibration screw. See Figure 2.

   Figure 1. Calibration screw

5. Use a 1/16 in. hex Allen wrench to carefully turn the calibration screw on the control lever.

   CAUTION

   Use extreme caution not to let the lever move sideways while you adjust the set screw. Damage to the bi-metallic spring can occur if the end of the lever moves left or right by more than 1/16 in.

   Note: Ensure that at least one thread of the calibration screw above the top surface of the friction clip is visible, or at least one thread below the bottom surface of the control lever

6. Turn the calibration screw until the branch pressure on the display is equal to the neutral pressure, which is usually 8 psi.Note: Each battery segment symbol on the LCD screen represents 0.25 psi resolution, as shown in the following figure. Pay special attention to this extra resolution while you turn the set screw. It is critical that this value precisely matches the neutral pressure for seamless operation of the thermostat.

   Figure 2. Pressure display resolution

7. When you achieve the required neutral pressure, press Confirm to save the value and exit the calibration mode. A confirmation screen appears which flashes the stored neutral pressure for 3 seconds. Repeat the calibration procedure if this value does not match the required neutral pressure.

   Note: If you do not press Confirm within 3 minutes, the thermostat automatically exits the calibration mode, does not save the neutral pressure, and returns to the home screen. A confirmation screen.

Setting the temperature scale

About this task

You can display the temperature in Fahrenheit or Celsius. The default scale is Fahrenheit. To change the temperature scale, complete the following steps:

Procedure

1. To access the programming mode, press and hold all three buttons simultaneously until Pd appears on the screen.
2. Enter the following passcode: Confirm, Confirm, Up, Down, Confirm.
3. Press Confirm to navigate to the Celsius/Fahrenheit screen.

   °F displays, this indicates that you now program the temperature scale.

4. Press Up or Down to change the temperature scale.
5. Press Confirm to confirm the change.
6. Press Confirm repeatedly to exit the programming mode.

   When you exit the programming mode, the thermostat rebinds to the LoRa network.

Operation

Use the LCD screen and three buttons to adjust the setpoint temperature, turn on or off the occupancy override, and to measure the branch tube pressure.

Figure 1. WTL Thermostat screen

Table 1. WTL Thermostat screen

Callout	Description
A	Setpoint
B	Temperature
C	Fahrenheit or Celsius indicator
D	Pressure indicator, shows in select operating modes only
E	Battery level

Adjusting the setpoint temperature

Procedure

1. Press Up or Down once to view the current temperature setpoint.
2. Press Up or Down to change the temperature setpoint to the required setpoint.
3. Press Confirm to confirm the change.

Measuring the branch tube pressure

Procedure

1. Press and hold Down and Confirm for 2 seconds. The screen shows dt.
2. Press Confirm until the screen shows PRESSURE. The screen shows the branch pressure in psi along with the pressure indicator.

   If the motor is in motion when you try to access the branch pressure the screen shows --. Press Confirm to exit and try again.

3. Press Confirm repeatedly to exit.

Checking the neutral pressure

Procedure

1. Press and hold Down and Confirm for 2 seconds. The screen shows dt.
2. Press Confirm until the screen shows PRESSURE. The screen shows the branch pressure in PSI along with the pressure indicator.

   If the motor is in motion when you try to access the branch pressure, the screen shows --. Press Confirm to exit and try again.

3. Press Down. The screen flashes the stored neutral pressure for 3 seconds, then returns to the home screen. The battery segments on the screen represent 0.25 psi increment. See Figure 2.

Locking and unlocking the thermostat controls

About this task

You can lock the thermostat to prevent occupants overriding the setpoints. To lock or unlock the thermostat, complete the following step:

Procedure

Press Up and Down simultaneously.

Results

The screen shows LC if the thermostat is locked or UL if the thermostat is unlocked.

Activating LoRa Over-The-Air

About this task

The WTL Thermostat uses OTAA to create a connection link to the network.Note:

• You must configure the gateway with the LoRa device equipment unique identifier, this is the MAC ID, for each thermostat before you bind that thermostat.
• Use the following steps also to initiate a forced discovery when required. A forced discovery before you bind the thermostat to the LoRa network causes an error. A forced discovery transmits a test data packet and verifies that an acknowledge is received from the network to indicate the link is good.

Procedure

1. Press Confirm and Down simultaneously.
2. Press Up to bind. The screen shows three horizontal dashes while it performs a bind.

Results

If the bind is successful, the screen shows PA. If the bind is not successful the screen shows E2. See Table 2 for information about the E2 error code.

BACnet objects

Table 1. BACnet objects for WTL thermostat

BACnet object name	Data type	Read/Write	Function	Operational details
Current_Temp	AI-1	Read-only	Current space temperature	Displays the current space temperature at the thermostat in degrees Fahrenheit.
Branch_Pressure	AI-2	Read-only	Branch line pressure	Displays the current branch line pressure at the thermostat in PSI.
Battery_Level	AI-3	Read-only	Battery level percentage	Displays the current battery level as a percentage.
Setpoint	AO-1	Read/write	Occupied state setpoint	Displays and enables control of the Occupied state setpoint value in degrees Fahrenheit.
Unoccupied_Setpoint	AO-2	Read/write	Unoccupied state setpoint	Displays and enables control of the Unoccupied state setpoint in degrees Fahrenheit.
Setpoint_CoolAbove	AO-3	Read/write	Deadband Cooling Setpoint	Displays and enables control of the cooling setpoint value in degrees Fahrenheit. Available on Deadband models only.
Setpoint_HeatBelow	AO-4	Read/write	Deadband heating setpoint	Displays and enables control of the heating setpoint value in degrees Fahrenheit. Available on Deadband models only.
Unoccupied_Setpoint_CoolAbove	AO-5	Read/write	Unoccupied deadband heating setpoint	Displays and enables control of the unoccupied heating setpoint value in degrees Fahrenheit. Available on Deadband models only.
Unoccupied_Setpoint_HeatBelow	AO-6	Read/write	Unoccupied deadband Cooling setpoint	Displays and enables control of the unoccupied cooling setpoint value in degrees Fahrenheit. Available on Deadband models only.
Occ_State	BO-1	Read/write	Occupancy state status	Displays and enables control of binary status indicator for the operation state of the thermostat, occupied or unoccupied.

Note: The WTL Thermostats do not provide an offline alarm notification in the event of loss of communication or power. When you integrate the WTL Thermostats into a BAS Supervisory Controller, it is best practice to create a separate offline alarm that triggers on the reliability status of the thermostat's BACnet points. In the event of loss of communications or power, the thermostat's BACnet objects show a status of unreliable after being offline for 25 minutes.

Troubleshooting

Note: These diagnostic indications disappear automatically after a few seconds.

Table 1. Diagnostic functions

Code	Cause
dy	Discovery Status. The thermostat performs a discovery operation. Do not disturb.
dt	Select the required diagnostic function: press Up to perform a Forced Discovery or press Confirm for diagnostics.
Fd	The thermostat performs a Forced Discovery. If connection is successful, PA appears on the screen. If connection is unsuccessful, an error code appears on the screen.
PA	The selected operation is successful. Used in conjunction with OTAA bind or Forced Discovery.
UL	The keypad is unlocked.
LC	The keypad is locked.
bd	The thermostat has successfully bound to the gateway.

Table 2. Error codes

Code	Cause	Solution
E0	Discovery Error. Not able to connect to the gateway. Possible causes: the gateway is not turned on, the thermostat configuration is removed from the gateway, or the gateway is not within wireless range.	Verify that the gateway is turned on and the status LED is blinking. Move the thermostat closer to the gateway.
E1	The thermostat is not bound to the gateway.	Perform the OTAA bind procedure and check Forced Discovery again. See Activating LoRa Over-The-Air for the steps.
E2	The thermostat is not successfully bound to the gateway or the gateway is out of wireless range.	Verify that the thermostat is correctly added to the gateway and try to bind again. Move the thermostat closer to the gateway.

Table 3. Additional troubleshooting

Symptom	Possible solution
The thermostat does not appear to build branch pressure.	As a possible solution, complete the following steps: Remove the thermostat from the wall bracket. Verify that both the main and branch tubes are connected correctly. If they are not connected correctly, reattach the tubes and check the pressure again. See Figure 1 for locations of main and branch air ports. Remove the main tube and verify that air is coming out. If possible, measure the main pressure, this requires the connection of an additional pressure gauge, not included, to the main tube. Reconnect the main tube and remove the branch tube connection. Cover the branch port on the thermostat completely with a finger. Adjust the setpoint to at least 5°F above the ambient temperature for a direct-acting thermostat, or 5°F below the ambient temperature for a reverse-acting thermostat. Check the branch pressure, see Measuring the branch tube pressure. If the branch pressure is the same as the main pressure, the thermostat is working correctly. Potentially a leak exists in the branch tube downstream of the thermostat. If the branch pressure is not the same as the main pressure, the thermostat may be faulty. Swap the thermostat with another unit.
The thermostat does not seem to control correctly or makes a loud hissing sound.	Verify that both the main and branch tubes are connected correctly. See Figure 1 for locations of main and branch air ports. If the tubes are not connected correctly, reattach the tubes and check the system again. If the branch and main tubes are swapped, the thermostat is installed incorrectly and may be damaged. If the tubes are connected correctly, try to swap the thermostat with another unit.
The thermostat exhibits incorrect or suspect behavior after battery replacement, for example: non-responsive buttons, erroneous setpoint limits, inaccurate ambient temperature, or excessive motor movement.	Disconnect the battery from the thermostat. Press and hold Confirm until the screen turns black. Let the thermostat sit for 30 minutes to 45 minutes to fully discharge all components. This defaults many of the operating parameters of the thermostat to factory defaults. Reconnect the battery and follow the steps in Installing and replacing the battery.<button aria-label="Berbagi URL" data-context-menu="SHARE_URL" title="" type="button"></button>

 Technical specifications

Table 1. WTL Thermostat technical specifications

Specification		Description
Action		Direct acting, reverse acting
Number of pipes		2-pipe
Setpoint temperature range		55ºF to 85ºF (13°C to 29°C)
Air connections		3/32 in. (2.5 mm) ID tube fittings
Maximum operating pipe pressure		25 psi (170 kPa)
Airflow usage		31.1 scim at 16 psig, 43.2 scim at 25psig
Sensitivity		Factory adjusted to 2.0 PSI/F – 2.5 PSI/F
Operating frequency band		915 MHz LoRa network band
LoRa encryption		128 bit, dual layer
Transmission ranges	Recommended indoor on one floor	250 ft (76.2 m)
	Recommended indoor over multiple floors	150 ft (45.7 m)
	Line of sight, maximum	400 ft (122 m)
Transmission interval		5 minutes
Antenna gain		1.7 dBi
Output power		18.5 dBm
Battery life		Minimum of 2 years, with four setpoint changes per day
Operating conditions		32ºF to 122ºF (0ºC to 50ºC), 95% RH maximum, noncondensing
Storage conditions		-40ºF to 122ºF (-40ºC to 50ºC) 95% RH maximum, noncondensing
Dimensions H x W x D		5.6 in. (141 mm) x 4.1 in. (104 mm) x 2.1 in. (53 mm)

Metal objects or other obstructions can reduce or completely block the wireless signal transmissions.

Repair information

If the WTL thermostat fails to operate within its specifications, replace the unit. For a replacement thermostat, contact the nearest Johnson Controls® representative.

Product warranty

This product is covered by a limited warranty, details of which can be found at www.johnsoncontrols.com/buildingswarranty.

Single point of contact

APAC	EU	UK	NA/SA
JOHNSON CONTROLS C/O CONTROLS PRODUCT MANAGEMENT NO. 32 CHANGJIANG RD NEW DISTRICT WUXI JIANGSU PROVINCE 214028 CHINA	JOHNSON CONTROLS VOLTAWEG 20 6101 XK ECHT THE NETHERLANDS	JOHNSON CONTROLS TYCO PARK GRIMSHAW LANE MANCHESTER M40 2WL UNITED KINGDOM	JOHNSON CONTROLS 5757 N GREEN BAY AVE. GLENDALE, WI 53209 USA

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