Remote Shutdown / Tstat Enable; Epu-D Outputs; Valve Actuator; Boiler Burner - heat-timer EPU-D Installation And Operation Manual

Remote Shutdown / TSTAT Enable
The remote shutdown / TSTAT enable feature sets the signal (open or short) on the EPU‐D Shutdown terminals
(17 and 18) that allows the control to operate.
• For Shutdown, an "open" signal allows the control to operate and provide heat. When shorted, the control
is disabled.
• For TSTAT Enable, a "short" signal allows the control to operate and provide heat. When open, the control
is disabled.
When the control is disabled, the Burner and Motorized Valve output relays are de‐energized, turning off the
boiler or closing the motorized valve.
This feature can be used when it is desirable to deactivate the EPU‐D from a remote location or with another
controller, such as a Building Management System (BMS).
The Shutdown signal must be dry‐contact only. DO NOT place voltage
across the Shutdown terminals.
EPU‐D Outputs
Valve Actuator
The EPU‐D is designed to connect to a motorized valve actuator. Using the inputs from the outdoor temperature
sensor and the system temperature sensor, the EPU‐D controls the heating system by opening and closing the
motorized valve actuator.
Boiler Burner
The EPU‐D is designed to connect to the boiler burner. Using the inputs from the outdoor temperature sensor
and the system temperature sensor, the EPU‐D controls the heating system by turning the boiler burner on or
off.
Heat‐Timer Corp.
CAUTION
Detailed Operation 9
059840‐00 Rev. A