SPX Hankison GCU Series, Instruction Manual

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1.2 Mounting 

Mount the dryer on a level solid surface.  Holes are provided 

in the dryer base to permanently mount the dryer to the 

floor.

1.3 Piping Connections 

A.  Air Inlet - Connect compressed air line from air source 

to air inlet.  (Reference markings on dryer for air inlet/

outlet connection locations.)

  Refer to Serial Number Tag for maximum 

working pressure.  Do not exceed dryer’s Maximum Working 

Pressure.
NOTE:  Install dryer in air system at highest pressure possible 

(e.g. before pressure reducing valves).
NOTE:  Install dryer at coolest compressed air temperature 

possible.  Maximum inlet compressed air temperature: 120°F 

(49°C).  If inlet air exceeds this temperature, precool the air 

with an aftercooler.  
B.  Air Outlet – Connect air outlet to downstream air lines.
C.  Bypass piping – If servicing the dryer without interrupting 

the air supply is desired, piping should include inlet and 

outlet valves and an air bypass valve.

D.  Water cooled models – cooling water inlet and outlet

1.  Connect cooling water supply to cooling water inlet.

2.  Connect cooling water return line to cooling water 

outlet connection.

NOTE:  Strainer and water regulating valve are supplied on 

water cooled models.

1.4 Electrical Connections

IMPORTANT:  Use copper supply wires only.
A.

Dryer is designed to operate on the 

voltage, phase, and frequency listed on 

the serial number tag.

B.  If dryer is supplied with a cord and plug, 

install in a receptacle of proper voltage.

C.  Electrical entry on larger dryers is through a hole in 

the cabinet.  It is located on the right side panel when 

facing the front of the unit.  Connect power source to 

terminal strip in electrical enclosure as shown on the 

wiring diagram included with the dryer.

NOTE:  Refrigeration condensing unit is designed to run 

continuously and should NOT be wired to cycle on/off with 

the air compressor.

1.5 Moisture Separator 

A. 

Models 0.5 & 0.75:

Separator (and Oil Removal Filter where 

applicable) has an internal drain which 

automatically discharges condensate.  

Models 1.0 - 3.5:

Separator (and Oil Removal Filter where applicable) has 

an electronic demand drain (EDD) which automatically 

discharges condensate.  

NOTE:  It may be desirable to pipe the condensate from the 

Automatic Drain outlet to a suitable drain.

B. 

Models 0.5 & 0.75:

Separator has a knurled fitting with flexible drain tubing 

attached.  Be sure knurled fitting is tightened by turning 

counter-clockwise before operating dryer.

TO CLOSE

TURN COUNTERCLOCKWISE

C. 

Models 1.0 - 3.5:

For manual draining, convenient dryer depressurization, 

and EDD service, a three-way valve assembly has been 

installed at the bottom of the moisture separator (and 

cold coalescing filter where applicable).  Review the 

following for proper drain function:
•  Automatic  Draining  -  Valve  handle  should  be 

positioned parallel to the valve body (as shown), 

with the arrow on the handle pointing toward the 

EDD.  In this position, condensate will flow from the 

bowl to the EDD.

•  Drain Isolation (Shutdown) - Valve handle shall be 

turned perpendicular to the valve body (rotate 90°).  

In this position, condensate flow is shutoff.

•  Manual Draining - Drain valve handle shall be rotated 

slightly past the drain isolation position to allow 

throttling through the valve for manual discharge 

and depressurization.

•  NOTE:  The quick disconnect fitting allows removal 

of the entire drain assembly.  

However, the unit 

must be depressurized prior to disassembly or 

serious injury may occur.

NOTE

:

  Discharge is at system pressure. Drain line should be 

anchored.
NOTE

:

  Condensate may contain oil. Comply with applicable 

laws concerning proper disposal.

1.6  EDD Operation

A.  Verify that isolation valves are open. If the drain fails to 

discharge after the valve is energized, the electronic 

control circuit will repeatedly energize the valve in an 

attempt to clear the discharge port.  If, after 60 seconds, 

the drain still fails to discharge, the control circuit then 

switches to the alarm mode.  In this mode the valve is 

de-energized and the red alarm light is activated on the 

drain. The valve is then automatically energized every 

80 seconds for 60 seconds.  Check the drain operation.  

Push drain (push-to-test) button on the drain or the 

Electronic Controller (if equipped) to energize drain.  A 

flow of condensate and/or air should be present at the 

drain outlet.  The alarm mode automatically clears after 

the drain returns to normal operation.