6
H. Connect electric power, according to the wiring
diagram and nameplate power requirements, to the
electrical terminals. The refrigerated dryer is
designed to run continuously; therefore, it must be
wired separately from the air compressor cycling
switch. The dryer must not cycle with the air
compressor. All units are prewired internally.
Follow the recommendation on the electrical drawing
for the fuse size and the incoming power details.
Connect the power to the air dryer only through a
properly sized fused disconnect switch.
WARNING
Wiring to the dryer must meet the national (NEC) and
local code requirements. Check the voltage
specified on the nameplate to the electrical power
connecting to the dryer. Electrical connections must
be made by a qualified electrician.
CAUTION
SCROLL COMPRESSOR
Air dryers with a scroll compressor are
unidirectional and to function properly they must be
phased correctly. To turn the compressor clockwise,
use a phase sequence indicator to determine phases
A, B, & C. For proper compressor rotation, connect
the power supply phases A to L1, B to L2, & C to L3.
Reverse rotation may damage the compressor. If the
compressor is wired backwards the compressor will
be noisy, vibrate excessively and the oil sump will
become warm. The suction pressure will begin to
rise, and the discharge pressure will fall.
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