Mounting; Piping Connections; Electrical Connections; Moisture Separator - Gardner Denver RHP Series Instruction Manual

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 or see call out
drawing on page 10 for air inlet/outlet connection loca-
tions.)
NOTE: Use back-up wrench when making piping connec-
tions.
There shall be no external forces or vibrations
transmitted to the dryer inlet/outlet connections from the piping.
External piping must be properly supported. The installation of
a flexible connection or vibration dampener, within the air/gas
stream, prior to the dryer is recommended to further reduce the
possibility of damage from vibration or pulsations. Failure to do
so may void the warranty.
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.
NOTE: Use back-up wrench when making piping connec-
tions.
There shall be no external forces or vibrations
transmitted to the dryer inlet/outlet connections from the piping.
External piping must be properly supported. The installation of
a flexible connection or vibration dampener, within the air/gas
stream, prior to the dryer is recommended to further reduce the
possibility of damage from vibration or pulsations. Failure to do
so may void the warranty.
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 volt-
age, 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 dia-
gram included with the dryer.
NOTE: Refrigeration condensing unit is designed to run con-
tinuously and should NOT be wired to cycle on/off with the air
compressor.

1.5 Moisture Separator

A. Separator has an external drain which auto-
matically discharges collected condensate.
NOTE: It may be desirable to pipe the con-
densate from the Automatic Drain outlet to a
suitable drain.
B. For manual draining, convenient dryer depressurization,
and drain valve maintenance, a three-way valve assembly
is installed between the drain port on the moisture separa-
tor and the drain valve. On all models, the three-way
valve is mounted to the bottom of the separator vessel
using a pipe union. 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 drain valve. In this
position, condensate will flow from the bowl to the drain
valve.
• Drain Isolation (Shutdown) - Valve handle shall be
turned perpendicular to the valve body (rotate 90°). In
this position, condensate flow is shutoff.
Pipe Union
Manual Discharge Line
• 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 pipe union 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.
Solenoid Valve
3-Way Valve
Automatic Discharge Line
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