Johnson Controls ZL Series Installation Manual page 74

Troubleshooting
WARNING
Troubleshooting of components may require opening
the electrical control box with the power connected
to the unit. Use extreme care when working
with live circuits! Check the unit nameplate for
the correct line voltage and set the voltmeter to
the correct range before making any connections
with line terminals.When not necessary, shut off all
electric power to the unit prior to any of the following
maintenance procedures so as to prevent personal
injury.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation, which could cause injury to
person and/or damage unit components. Verify proper
operation after servicing.
WARNING
The furnace may shut down on a high temperature
condition during the procedure. If this occurs, the UCB
energize the supply air blower motor until the high
temperature limit has reset. Caution should be used
at all times as the supply air blower may energize
regardless of the room thermostat fan switch position.
74 Installation Manual ZL Series 7.5- 12.5 Ton 60 Hertz R-410A
Johnson Controls Ducted Systems