Installation 2 - 3
2.7 Electrical Connection
NOTE 1: Use proper, load-rated components as ap-
proved by NEC, NEMA, CSA, UL, etc., as re-
quired. Local and municipal codes may also
apply. All installations and connections must
be in accordance with recognized electrical
codes in effect.
NOTE 2: It is mandatory that each dryer be individually
GROUNDED. Do not use your plant’s frame
as a ground. Use an adequate ground with the
conductor sized to NEC.
NOTE 3: A disconnect switch is not provided as stan-
dard equipment and therefore, must be sup-
plied by the customer. The dryer’s electrical
load is indicated on the Dryer Specification La-
bel located on the inside cover of the dryer con-
trol enclosure.
NOTE 4: The manufacturer is not liable for code viola-
tions, component damage, downtime or conse-
quential damages related to customer supplied
and installed electrical components and con-
nections.
NOTE 5: Exercise CAUTION for Static Sensitive Devices
before making electrical connections.
NOTE 6: DRYER CONTROLS FOR HAZARDOUS LO-
CATIONS. Optima dryer controls for hazard-
ous locations comply with the National Electri-
cal Code (NEC) for application in Class I, Divi-
sion 2, Group B through D hazardous loca-
tions. Per NEC 501-3 (b),

all incendive devices

(power supply, common alarm relay, fuse)

that

may release enough energy to ignite B through

D gases and vapors

are located in a NEMA 7
enclosure.

Also,

all non-incendive devices

(so-
lenoid valves, DIP switch and pressure switch
contacts)

that do not normally release enough

energy to ignite B through D gases and vapors,

are located in a NEMA 4 enclosure.
1. For dryers equipped with an electronic timer, the dryer
is pre-wired and ready to use and is fitted with a
power cord. Refer to the dryer-mounted Specification
Plate or the Dryer Specification Sheet located in the
front of this manual for your specific dryer model's
electrical input requirements. Connect the dryer to
the power supply specified on the data plate.
2. For dryers equipped with the Hydrobloc DEC control-
ler, refer to the Dryer Specification Label, (located on
the inside cover of the dryer control enclosure) for
your specific dryer model’s electrical input require-
ments. ENSURE THAT THE INTENDED POWER
SOURCE CONFORMS TO THESE REQUIRE-
MENTS.
Figure 2.1
RECOMMENDED PIPING LAYOUT
PREFILTER
BLOCK
VALVE
AIR
INLET
DRAIN
VALVE
BLOCK
VALVE
SERVICE
VALVE
AIR
OUTLET
AFTERFILTER
DRYER
BYPASS
VALVE
2.5 Purge Exhaust Restrictor
The dryer’s Purge Exhaust Restrictor quiets the gas flow
and prevents desiccant bed fluidization by controlling
(slowing) the rate of depressurization.
On dryer models LS60 through LS1000 the Purge Exhaust
Restrictor is designed into the Purge Exhaust Valve.
On dryer models LS1250 through LS2580 the Purge Ex-
haust Restrictor must remain attached to the purge ex-
haust switching valve body to operate properly.
2.6 Purge Exhaust Muffler
The dryer’s Purge Exhaust Muffler quiets the gas flow to
atmosphere during depressurization and regeneration
(purge) cycles.
On models LS2070 and LS2580, the purge exhaust muffler
must be piped BY THE CUSTOMER to a remote location.
A removable section of pipe should be provided at the
Purge Exhaust Restrictor for ease of maintenance and the
muffler should be mounted in a self-draining position.
Note: The pipe run from the dryer to the muffler should not
exceed 100 equivalent feet of pipe using a pipe size equal
to or larger than the Purge Exhaust Restrictor connection.
Consult with your local Deltech Sales Representative for
requirements when the equivalent feet of pipe exceeds 100
feet.