Installation Guide

27390031
2902 Electric Latch Retraction Controller
Installation Instructions
I-EA00002
INSTALLATION INSTRUCTIONS (cont)
Symptom:
When 120 volts is applied to TB1, the exit devices will momentarily retract;
but if they remain retracted for longer than 20 seconds, then it signals a
problem.
Possible Causes:
1. Field wiring between the power supply and control switch are
shorted together against the conduit or switch mounting box.
2. A maintain switch is being used and is in the closed position.
3. A defective control switch.
Symptom (for polarized 1550C ELR devices only):
A noticeable buzzing sound at equal intervals is coming from inside the exit
device while in its fully retracted state.
Possible Causes:
1. The latch is binding against its corresponding strike and
preventing it from fully retracting, due to misalignment between
the latch and strike opening.
2. A defective pulse module
NOTES
1. This unit is listed as an exit device control unit to UL924
requirements.
2. The power output of the controller is of a fail secure design. The
exit device remains latched during a complete power failure, but
always allows free mechanical egress. Listed panic hardware
may be required to allow emergency exit. Consult local authority
having jurisdiction.
REV 2
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