SPX Hankinson HHE Series Instruction Manual page 16

4.5 Minimum Operating Pressures:
4.5.1 For 150 psig (10.3 barg) MOP models -
• 60 psig (4.1 barg) is the minimum operating pressure for dryers
operated on ISO classes 1, 2, 3, and 4.
4.5.2 For 250 psig (17.2 barg) MOP models -
• 120 psig (8.3 barg) is the minimum operating pressure for dryers
operated on ISO classes 1, 2, 3, and 4.
Refer to Dryer Serial Number Tag.
WARNING - Do not operate the dryer at pressures below the
minimum operating pressure shown on the serial number tag.
NOTE: Consult factory for applications requiring lower minimum
operating pressures.
4.6 Maximum Compressed Air Temperature at Dryer
Inlet:
• 140°F (60°C) for all models.
4.7 Ambient Temperatures:
4.7.1 Minimum Ambient Temperature
• Standard units: 35°F (2°C)
• Units with optional low ambient package: -20°F ( -29°C)
4.7.2 Maximum Ambient Temperature
• 120°F (49°C)
NOTE: If dryer is installed in ambients below 35°F (2°C), low ambient
protection requiring heat tracing and insulation of the prefilter bowls,
auto drains and/or sumps, and lower piping with inlet switching and
purge/repressurization valves is necessary to prevent condensate
from freezing. If installing heat tracing, observe electrical class code
requirements for type of duty specified. Purge mufflers and their relief
mechanisms must be kept clear from snow and ice buildup that could
prevent proper discharge of compressed air.
4.8 Mounting
Install dryer on a level pad. Holes are provided in the dryer base
members for floor anchors.
NOTE: Floor anchors must be used if area is subject to vibration.
4.9 Piping
Inlet and Outlet connections
Observe locations of inlet and outlet connections as shown in Figures
4-2, 4-3 or 4-4 and connect inlet and outlet piping as indicated.
NOTE: All piping must be supported so as not to bear on the dryers
or filters.
4.10 Isolation Valves
If isolation or bypass valves are installed, care must be used to
ensure that equipment is pressurized slowly. This is particularly true if
isolation valves are placed before and after pre and afterfilters where
rapid pressurization could cause excessive pressure drop across
filter elements.
NOTE: When quarter-turn valves (e.g. ball or butterfly valves) are
used for isolation of pressure components, care should be taken to
open or close valves slowly.
4.11 Electrical Connections
Refer to the appropriate controller sections for detailed information
on connections, ratings, and operation of the Level 1 or Level 2
Controller.
NOTE: Refer to the dryer serial number tag for allowable voltages,
frequency and power rating.
4.12 Provisions for Purge Exhaust
• Purge exhaust must be routed through the factory supplied
mufflers or piped to a remote location.
• Purge mufflers - If shipped separately, install purge exhaust
mufflers in the locations shown in Figures 4-2, 4-3 or 4-4.
• If purge exhaust is piped to a muffler located in a remote location,
choose a combination of diameters, lengths, and turns that limits
the additional pressure drop to 1 psid or less.
WARNING - Do not operate dryer without installed mufflers.
Exhausting compressed air directly to atmosphere will result in
noise levels above OSHA permissible levels and rapidly expanding
gas could potentially cause harm to persons or property.
4.13 Initial Desiccant Charge
The dryer is shipped complete with desiccant and is ready to operate
after piping and electrical connections are made and controller settings
are established.
4.14 Icon Identification
P
P
— 14 —
Left Tower
Pressure Gauge
P
Right Tower
Pressure Gauge
Air Outlet
Air Inlet
Purge
Pressure Gauge
Electrical
Inlet