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START UP
START UP
Unit Control
To initiate operations, set the ON/OFF switch to the ON position.
Six seconds later, the control system will signal the unit to start.
NOTE: Ensure that all installation points have been thoroughly
inspected and confirmed to be correct before powering the
unit. Activate the unit by switching the CONTROL UNIT to the
ON position, which will supply the control panel with 24 volts.
Three Phase Scroll Compressor Start Up Information
Scroll compressors, similar to many compressor types, compress
air in only one specific rotational direction. Single-phase
compressors inherently start and run in the correct direction,
eliminating concerns about rotation.
Conversely, three-phase compressors can rotate in either direction
based on the power phase connection. With an equal chance of
connecting power to cause reverse rotation, it’s crucial to verify
the correct rotation direction. This verification can be observed by
noting a drop in suction pressure and an increase in discharge
pressure upon compressor activation. Reverse rotation is
identifiable by an unusually high sound level and significantly lower
current draw than the expected values.
It’s imperative to confirm the proper rotation direction when the
equipment is first commissioned. Correcting an incorrect rotation
at this stage will not adversely affect the compressor’s longevity.
However, allowing the compressor to operate in reverse for more
than an hour might negatively impact the bearings due to the oil
pump mechanism being compromised.
NOTE: Allowing the compressor to operate in reverse rotation
for an extended period will trigger the internal protector to
trip, halting operation to prevent damage.
Internally, all three-phase compressors are wired in the same
manner. Therefore, once the correct phasing for a particular
system or installation is identified, connecting properly phased
power leads to the designated terminals will ensure the correct
rotational direction is maintained.
To alter the compressor’s rotation direction, simply reverse any
two line connections to the unit. This adjustment allows for easy
correction of the rotation direction if initially set incorrectly.
Phase Monitor
All units featuring three-phase scroll compressors come with a
three-phase line monitor designed to avert compressor damage
resulting from phase reversal. This phase monitor is equipped with
two LEDs for clear status indication.
When the Y signal (call for cooling) reaches the phase monitor and
the phases are correctly aligned, the green LED will illuminate,
signaling proper operation. Conversely, if the phases are reversed,
the red fault LED will activate, and the compressor’s operation will
be automatically inhibited to prevent damage.
Should a fault condition be detected, indicating phase reversal,
rectify this by switching two of the supply leads to the unit. It’s
crucial not to alter any of the unit’s factory-set wiring, as doing so
could lead to damage.
Condenser Fan Control
The condenser fan control is designed to activate the fan as
needed when the compressor operates within the circuit. The fan
and solenoid valve are deactivated when the circuit is off or in a
pre-open condition. Digital outputs for the condenser fan respond
instantly to condenser stage changes, activating or deactivating as
required. Meanwhile, the condenser solenoid valve outputs activate
immediately for an increase in stage but include a 20-second delay
when deactivating during a decrease in stage. Should the circuit
be powered down, the outputs for the capacitor solenoid valve
deactivate immediately, without any delay.
NOTE: Some models are equipped with low ambient control
(LAC). For these models, the condenser fan motor’s startup
is delayed until the refrigerant operating pressure within the
system reaches an adequate level. Upon starting, the fan
motor’s operation may cycle based on ambient conditions,
which is considered normal behavior.
After activating the controller, allow a 5-minute period for the unit to
prepare for operation. During this time, it will initiate an operating
sequence that includes verifying all pre-programmed safety points.
If all necessary conditions are met and deemed correct, the unit
will then be ready to commence operations. If unit fails to meet the
safety requirements, it will not commence operation.