Cypress Envirosystems WPT Series User manual

WPT Quick Start Guide
Document No. 910-00028-01, Rev 03
Wireless Pneumatic Thermostat- WPT Series
Page 1 of 21
1 Overview
The Cypress Envirosystems Wireless Pneumatic Thermostat (WPT) retrofits an
existing pneumatic thermostat to provide Direct Digital Control (DDC) like zone control
functionality at a fraction of the time and cost without disturbing occupants.
The WPT enables remote monitoring of zone temperature, branch pressure, remote
control of setpoints, and programmable setback or setup of the pneumatic HVAC
systems. It also enables integration with utility Demand Response programs.
The WPT can be integrated with an existing Building Management System via
BACnet/IP. As a result, the WPT helps a building owner and tenants save energy by
implementing indoor temperature policies, improve comfort, and reduce the
maintenance cost of the legacy pneumatic HVAC systems.
1.1 Components
The WPT Series kit includes the following components:
•WPT
•Universal Wall Bracket
•Mounting screws, #6 x 1” self-tapping (x2)
•Wall Anchors
•Tadiran TL-5920 lithium battery
1.2 Prerequisites for Installation
The WPT relies on a wireless network for communication. Before installing the WPT,
the wireless network must be set up. The following tasks must be completed before
proceeding to WPT installation:
•Installation of WPT Green Box Server and Blue Box Gateway
•Assignment of a unique node ID for each WPT (to be programmed during
installation)
•LoRa gateway must be configured with for each WPT. (Please refer to the LoRa
WPT Gateway and Server Installation Manual, Document number 910-00031-
01).
1.3 Tools Required for Installation
•# 1 Philips-head screwdriver
•1/16” hex Allen wrench
•3/16” Drill (for setting Wall Anchor, if required)
2 WPT Installation
The overall WPT installation procedure includes:
•Mounting the WPT on the wall
•Configuring the WPT
•Calibrating the WPT

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2.1 Mounting the WPT
2.1.1 Remove the Existing Thermostat
Remove the external cover of the existing thermostat, if any.
Locate and remove the mounting screws and carefully remove the unit from the wall
along with the attached pneumatic tubes.
Detach the old thermostat unit from the air tubes carefully. The air tubes may not
have a lot of slack –be careful that the tubes do not retract into the wall. In a 2-pipe
system, note the positions of branch and main tubes.
2.1.2 Installing the WPT
The WPT is installed in the existing thermostat location using the Universal Wall
Bracket provided with the WPT kit. Care must be taken when opening and calibrating
the WPT.
ESD Handling Precautions
Warning!
•The WPT contains ESD sensitive circuit cards and components.
•Great care must be exercised while handling the WPT with the cover open.
•Do not touch any of the circuit boards with fingers or any part of the body.
•Touching the circuit boards may cause the unit to fail due to electrostatic
discharge.
•Hold and handle the unit as shown in Figure 1, using the external bottom plastic
cover as the support.

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Figure 1. Handling the WPT
Thermostat Lever Handling Precautions
•Great care must be exercised while calibrating the WPT.
•Handle the thermostat lever as little as possible.
•Use extreme caution not to allow the lever to rotate sideways while adjusting the
setscrew.
•Damage to the bi-metallic spring can result if the end of the lever is allowed to
move left or right by more than 1/16”.
Do Not Touch
Electrical
Contacts

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Figure 2. WPT Lever
To install the WPT:
Remove the plastic cover of the WPT using a 1/16” Allen wrench on the bottom
screw.
If the Universal Wall-mounting Bracket is attached to WPT, remove it by unscrewing
the two captive screws on the bottom of the WPT, as shown in Figure 3.
Figure 3. Removing the Universal Wall Bracket
Do Not Touch
Calibration
Screw
Unscrew these two screws to
Dismount wall bracket from rear side

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Adjust the Universal Wall Bracket against the old thermostat position, such that any
two slots on the wall bracket match the existing two screw holes on the wall, and
the large center opening is aligned with the air tube(s). The Universal Wall Bracket
is shown in Figure 4.
Figure 4. Universal Wall Bracket
Pull the air tubes through the central opening of the Universal Wall Bracket.
Affix the Universal Wall Bracket to the wall with two screws, as shown in Figure 5.
Note: The provided Wall Anchors can be used if existing receptacles are not in the
correct location, or if they are damaged.
Figure 5. Mounting the Universal Wall Bracket
Connect the branch and main tubes to the air tubes marked B and M on the rear of
the WPT, as shown in Figure 6.

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Figure 6. Connecting Main and Branch Tubes to M and B Ports
Attach the WPT to the Universal Wall Bracket using the captive screws.
Connect the battery and close the top cover. The battery connector is keyed to
prevent miswiring. Connect as shown in Figure 7.
Figure 7. WPT Battery
2.1.3 Installing/Replacing Battery
The WPT has a battery icon on the LCD display which indicates the current state of the
batteries. Batteries must be replaced anytime the battery icon displays fewer than 4
bars as shown in the images below.
When the batteries are too low to function normally, the WPT will enter a fail-safe mode
until batteries are replaced. The fail-safe mode shuts down all functions of the WPT
except for temperature control which continues to operate at a setpoint of 72 ºF. The
WPT will display the following screen during this mode.
Battery
Connector

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When replacing the battery, press and hold the center button while plugging in the
new battery connector. This will reset the battery gauge. When the display appears,
release the button.
The following tasks must be performed after replacing batteries:
•Press any button to power on the WPT.
•Perform an OTAA bind. Refer to Figure 8 for the menu structure.
•Confirm calibration and if needed, perform a manual calibration, see section 2.3.
•(Optional) Resend temperature setpoints, setpoint limits and auto calibration
values from the WPT Green Box Controller. Refer to the appropriate WPT Green
Box manual for instructions.
Note: If any of the steps above fail, refer to the Additional Troubleshooting section at
the end of this manual for further details.
2.1.4 Battery Handling Precautions
Replace battery only with the approved Tadiran TL-5920 lithium metal battery. This
battery meets UL-1642, as evidenced by UL component listing. Use of any other
battery may present a risk of fire or explosion. See Figure 7 for correct polarity of
connector.
•Underwriters Laboratories Recognition Mark:
•Caution: The battery used in this device may present a fire or chemical burn
hazard if mis-treated. Keep away from children and/or other untrained personnel.
Do not recharge, disassemble, heat above 100 ºC (212 ºF), or dispose of in fire.
•Dispose of used battery promptly in accordance with local regulations (place in
plastic bag and recycle if possible).
•Do not insert batteries with the and polarities reversed.
•Do not short-circuit.
•Be sure to wrap each battery when disposing or storing to avoid short circuit.
•If leaked liquid gets in the eyes, wash them with clean water and consult a
physician immediately.
•Do not apply strong pressure to the battery nor handle roughly.
•Do not use or leave the battery in direct sunlight or in high-temperature areas.

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2.2 Configuring the WPT
The WPT can be configured using the LCD display and the 3 front buttons. The menu
structure is displayed below. Please refer to this diagram while calibrating and
configuring the WPT.

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Figure 8. WPT Menu Structure

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2.2.1 Programming Mode Password
A password is required to enter the Programming Mode. After pressing all three buttons
simultaneously, the following screen will appear:
The password is a series of button presses: “OVR”,”OVR”,” ▲”, “▼”, “OVR”
2.2.2 Configuring the Frequency Sub-band and Node ID
The WPT must be configured with a valid frequency sub-band and node ID. The
frequency sub-band is a single digit number, from 1-9. Sub-bands 1-8 select the LoRa
sub-band channel set as show in Figure 9 below. Setting the frequency sub-band to 9
allows the WPT to broadcast on all channels.
LoRa uplink sub-bands
Frequency range (MHz)
Channels
Sub-Band 1
902.3 - 903.7
0-7
Sub-Band 2
903.9 - 905.3
8-15
Sub-Band 3
905.5 - 906.9
16-23
Sub-Band 4
907.1 - 908.5
24-31
Sub-Band 5
908.7 - 910.1
32-39
Sub-Band 6
910.3 - 911.7
40-47
Sub-Band 7
911.9 - 913.3
48-55
Sub-Band 8
915.5 - 914.9
56-63
Figure 9. WPT Node ID Digits
The node ID is a four-digit number. The four digit node ID is displayed in groups of two
(D2, D1 together and D4, D3 together).
D4
D3
D2
D1
Figure 10. WPT Node ID Digits
Before programming the WPT, connect the battery and then, press any button. The
system will turn on and initialize. During initialization and whenever the WPT starts a
contact [email protected] for password