Pneumatech AD Series, Owner'S Manual

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.