Installation manual

110 McQuay IM 487-4
Maintenance
Circuit Breaker
Circuit breakers are installed upstream of all VFDs to provide
short circuit protection.
To reset a tripped circuit breaker: Clear the trip by rotating the
lever down to the OFF position. See


in Figure 122. Then
rotate lever up to the ON position. See


in Figure 122.
Figure 122. Circuit breaker
Disconnect
The optional disconnect is a molded case switch with many of
the same features of the circuit breaker. The disconnect comes
standard with a through-the-door handle and mechanism to
disconnect power to the unit prior to opening the door. The
handle can be padlocked in the OFF position while performing
maintenance to the unit.
Figure 123. Through-the-door handle disconnect
WARNING
If an overload or a fault current interruption occurs, check
circuits to determine the cause of the interruption.
If a fault condition exits, examine the controller. If damaged,
replace it to reduce the risk of fire or electrical shock.
ON position
OFF position
1
2
CAUTION
Molded case switches do not provide over-current protection.
This device may automatically open the circuit at levels above
the ampere rating of the switch.