3
b. Observe the drain when discharging to see if
all the liquid present has been removed. This
is evident if some air escapes after the liquid
has been discharged and before the valve
closes. If liquid is still present when valve
closes, increase “on time”. If excessive
air flows after liquid has been discharged,
decrease “on time”.
NOTE: The amount of liquid present can
change as operating conditions change
(compressed air and ambient temperatures,
flow rates, ambient relative humidity).
Observe drain periodically to make certain
that drain is remaining open long enough
to discharge collected liquids.
2. Valve closed time:
a. Using knob marked “off time (min)”, turn
knob until triangle on knob aligns with
desired time.
b. If all liquid cannot be removed during time
valve is open, increase valve “on time”. If
this is not possible, decrease “off time” so
that less liquid collects between operations.
C. Manual Override
Manual override allows manual operation of the valve.
To open valve, depress manual override switch.
D. Status lights
1. “Power” light - light illuminates when timer is
energized. If light is not illuminated, check that
power supply is on and electrical connections are
sound.
2. “On” light - light illuminates when output to
solenoid coil is energized. Valve should be open
when this light illuminates; if valve doesn’t open,
service is required.
NOTE: Coil is designed for continuous duty
service. However, when solenoid is energized for
a long period, the coil enclosure becomes hot
and can be touched with the hand for only an
instant. This is a safe operating temperature.
COMPRESSOR SEPARATOR OIL
RECEIVER
REMOVAL
FILTER
AFTERCOOLER AUTOMATIC DRYER
DRAIN
Typical Compressed Air System
2.0 OPERATION
NOTE: Unit is adjusted to operate in altitudes up to 4500
feet (1370 meters). If unit is installed in an altitude above
this and has not been preset at the factory for this
altitude, contact manufacturer’s Service Department.
2.1 Minimum/maximum operating conditions
A. Maximum inlet air pressure: refer to unit serial
number tag.
B. Minimum inlet air pressure: 5 psig (0.3 bar).
C. Maximum inlet air temperature: 120°F (49°C).
D. Maximum ambient temperature: 110°F (43°C).
E. Minimum ambient temperature: 35°F (1.7°C).
2.2 Start-up
Models RHP13 and RHP20 - Energize compressor by plugging
in power supply cord. Power-on light will illuminate.
Models RHP25 and larger - Energize the compresser by
positioning the on/off switch in the on position ("I"
button depressed). Power-on light will illuminate.
2.3 Condensate drain
A. Condensate is discharged by an electrically operated
solenoid valve. The valve is opened and closed by a
solid state electronic timer that can be adjusted
within the following time limits:
Valve open, “ON” time: 1 to 15 seconds.
Valve closed, “OFF” time (time between valve
operations): 1 to 45 minutes.
B. Timer adjustment -
1. Valve open time:
a. Using knob marked “on time (sec)”, turn
knob until triangle on knob aligns with
desired time.
ELECTRIC DRAIN VALVE
