47 pg.
ComCo Systems Inc. | 800.533.3794 | www.comcosystems.com
500169 Rev. 18.0
521
Series
Maintenance Procedures
Blower Unit
The 521 Blower Unit is equipped with 10-amp circuit breakers to protect the motors from overload.
If the system does not work in one or both directions, check to see if either circuit breaker on blower has
tripped. Also, if SEND or RECALL lights but blower fails to run, confirm that door is fully closed.
If circuit breakers trip regularly, arrange for an authorized service agent to diagnose the problem.
Deceleration Trigger Bend
Proper deceleration trigger function is essential to good system performance.
If carrier lands hard at Customer Unit, inspect the deceleration trigger. If it is cracked, worn, or missing, it
must be replaced immediately
.
The deceleration switch assembly has 4 switches in it – only one switch is required for proper operation.
If the assembly is inoperable, it
must be replaced immediately
.
Carriers
Carriers should be inspected regularly for signs of wear. Carriers landing hard at either customer or
teller unit may be a sign of worn air discs or rubbing bands on carrier.
Replace air discs and/or rubbing bands as required.
Maintenance
