Cypress WPT Battery Replacement Instructions

1.

Overview

This technical note describes the Wireless Pneumatic Thermostat (WPT) battery
replacement procedures presented in a bulleted list of simple steps. This technical
note covers thermostats with current as well as older firmware versions.
troubleshooting section provides the necessary steps to reset the WPT if any non-ideal
behavior is noticed.
1.1.

Tools Required for Installation

•
1/16" hex Allen wrench
•
2mm hex Allen wrench (older versions)
2.

Battery Replacement

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 Figure 1 below.
Figure 1: Low Battery Icon Examples with Fewer than 4 Bars Displayed
When the batteries are too low to function normally, the WPT will enter a fail-safe mode
(Figure 2) 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.
Note: With older generation WPT thermostats, the device may go directly to a blank
display and/or stop responding to button presses.
2.1. Battery Installation
After replacing batteries, following tasks must be performed:
•
Press any button to power on the WPT.
•
Perform a Force Discovery. Refer to Figure 4 or Figure 8 for the menu structure.
•
Perform a manual calibration, Refer to section 2.3.1or 2.3.2.
•
(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 Section 3 (Troubleshooting) for further
details.
Figure 2: LCD Display during the Fail-Safe Mode
Tech note: WPT Battery Replacement
Doc No. 910-00022-01 Rev 01
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