Rehau STAR 20 Installation Manuallines page 25

Pump and boiler jumper connections
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Attach cables from actuators in the same
way. You can switch up to 4 actuators with each
controller. Ensure all cables are connected properly.
Jumper
J1-Boiler and pump protection
ON -OFF
Jumper
J2-Pump overrun time ON -OFF
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When you've completed the settings, replace
the cover on the base using 4 screws.
Function
ON -Enables boiler and pump protection
(delays turning on pump and boiler relays for
3 minutes when a controller calls for heat)
OFF - Disables boiler and pump protection
(immediately turns pump and boiler relays on
when a controller calls for heat
Function
ON - After all controller have switched off the
pump runs for an additional 3 minutes for
boiler protection
OFF - Disables pump over run. When all
controller are switched off the pump will
also switch off immediately as well
Default Setting
Jumper is ON (3
minute) position
Default Setting
Jumper is ON (3
minute) position
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