Cypress WPT - WPT Thermostat Model Selection

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Cypress Confidential
Thermostat Identification
Use the following guidelines for proper selection of the WPT model
1) Is the Thermostat to be retrofitted a Wall/Room Thermostat?
- Note: WPT does not replace the Remote Bulb thermostats
2) Is it a one-pipe (low air capacity) or two-pipe (high air capacity) thermostat?
3) Is the control action direct or reverse acting?
- Verify existing thermostat operation by adjusting the setpoint dial and noting the operation. This is
particularly important if there is no model number readily available on the thermostat.
- Direct acting: An increase in temperature above setpoint results in an increase in the branch line air
pressure.
Example:
Room temperature 72.0
Setting the setpoint to 55.0 (branch pressure increases)
Setting the setpoint to 85.0 (branch pressure decreases) Normally open heating valve
- Reverse acting: An increase in temperature above setpoint results in a decrease in the branch line air
pressure.
Example:
Room temperature 72.0
Setting the setpoint to 55.0 (branch pressure decreases)
Setting the setpoint to 85.0 (branch pressure increases) Normally closed heating valve