Install Instructions

INSTALLATION INSTRUCTIONS

® U.S. Registered Trademark

7800 SERIES

ST7800A,C Plug-In Purge Timer

APPLICATION

The ST7800A,C Plug-in Purge Timers provide the prepurge

timing for the 7800 SERIES Relay Modules. See Table 1.

INSTALLATION

WARNING

Fire or Explosion Hazard.

Can cause severe injury, death or property

damage.

Perform verification of safety requirements EACH

TIME the control is installed to prevent possible

hazardous burner operation.

WARNING

Electrical Shock Hazard.

Can cause serious injury or death.

Disconnect power supply before installing Purge Time

to prevent electrical shock or equipment damage.

More than one power supply disconnect can be

involved.

1. Remove the Keyboard Display Module (KDM), Dust

Cover, Data ControlBus Module™ or Remote Reset

Module.

2. Remove the current ST7800A,C (if installed) from the

7800 SERIES Relay Module by pulling upward on the

plastic support cover. See Fig. 1.

3. Make sure the new ST7800A,C selected has the

desired timing period. The timing is listed on the device

label.

4. Properly orient the plug-in purge timer with the opening

in the relay module, and insert the purge timer into the

opening of the relay module compartment. See Fig. 1.

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7800 SERIES ST7800A,C Plug-In Purge Timer INSTALLATION INSTRUCTIONS INSTALLATION WARNING Fire or Explosion Hazard. Can cause severe injury, death or property damage. Perform verification of safety requirements EACH TIME the control is installed to prevent possible hazardous burner operation. APPLICATION WARNING The ST7800A,C Plug-in Purge Timers provide the prepurge timing for the 7800 SERIES Relay Modules. See Table 1. Electrical Shock Hazard. Can cause serious injury or death.
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ST7800A,C 7800 SERIES PLUG-IN PURGE TIMERS Table 1. ST7800 Purge Timer Prepurge Timing. ST7800A Number ST7800C Numbera Prepurge Timing Fig. 1. Purge card installation. 5. Reinstall the KDM, Dust Cover, Data ControlBus Module™ or Remote Reset Module and restore power to the device. Run the burner system through at least one complete cycle to make sure that the system is operating as desired.