Cypress Envirosystems WPT-800-DB Series Manuel d'installation - Page 11

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2.3

Setting the Deadband Control Pressure

The WPT-DB thermostat extends the functions of the conventional WPT thermostat by

allowing a temperature range to be programmed where no heating or cooling takes

place. This range is known as the Deadband. All pneumatic systems will have a neutral

control pressure (control point), typically ~8psi, where the zone is neither heated nor

cooled. If the branch pressure is held at this control pressure, the zone will use a

minimal amount of energy. The Deadband Control Pressure is set during calibration.

See sec 2.4 for calibration details.

20psi

Control Pressure

0psi

Heat Below

2.4

Calibrating the WPT-DB

1. Remove the front cover of the WPT-DB and make sure that the WPT-DB is

acclimatized to the ambient temperature.

NOTE: This can take 5 to 10 minutes after attachment to the wall. The bi-metallic spring

is very sensitive to body heat. Keep hands and breathe away from WPT-DB to

minimize calibration error.

NOTE: The black throttling range adjuster has been factory set to the location marked

on the lever as shown in Figure 14. The factory setting provides a Throttling

Range (TR) of 4° F. This TR adjuster MUST NOT BE MO VED in order to ensure

proper operation and accuracy of the WPT-DB.

2. To enter Calibration Mode, perform the following:

•

Press the ▼ button and OVR button together for two seconds. The display will

show 'dt'.

Heat Below

Setpoint

Figure 12: WPT-DB transfer function

WPT-DB Installation Manual

Document No. 910-00014-01, Rev. 04

Deadband

Span

Temperature

Deadband

Cool Above

Setpoint

Cool Above

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