SECTION 3 DHL HEATLESS REGENERATIVE DRYER
15
3.4 OPERATING CONDITIONS
• Maximum working pressure 150 PSIG (10
Bar) for higher pressure contact factory.
• Minimum working pressure 60 PSIG (4 bar)
• Maximum inlet temperature 120°F (49°C)
• Minimum ambient temperature: 34°F
(1.6°C) for lower ambient temperature con-
tact factory.
E
XAMPLE:
A ( DHL-250) has a nominal capacity of 250 SCFM.
What is the maximum allowable flow through the
dryer at following operating conditions?:
Air Inlet Pressure: 110 Psig (7.6 Bar) From table for
pressure correction F1=1.04
Air Inlet temperature: 105°F (40°C) From table for
temperature correction F2=0.93
3.5 CONNECTION TO THE
COMPRESSED AIR SYSTEM
Operations to be performed by qualified
personnel. Connections to be performed
by qualified personal. Never do service
with dryer under pressure.
The user is responsible to ensure that the dryer will
never be operated with pressure exceeding the
nominal values. Eventual over-pressure could be
dangerous both for the operator and the machine.
The temperature and the amount of air entering the
dryer must comply with the limits reported on the
data plate. In the event of particularly high inlet
temperatures, the installation of additional cooling
equipment such as water cooled after cooler or
refrigerated after cooler may be necessary. The air
supply piping should be free from dust, rust, ships
and other debris and must be sized to consistent with
the flow- rate of the dryer.
In designing the dryer, particular measures have
been taken in order to limit the vibration which could
occur during the operation. Therefore we
recommend to use connecting pipes able to insulate
the dryer from possible vibrations originating from the
line (flexible hoses, vibration damping fittings, etc.).
3.6 CONNECTION TO THE
ELECTRICAL SUPPLY
The connection to the electrical supply, to
be carried out by qualified personnel, and
the safety systems must comply with
local rules and laws.
Before connecting the unit to the electric power,
verify that the voltage and the frequency available on
the electrical supply correspond to the data reported
on the data plate of the dryer. In terms of voltage, a
±5% tolerance is allowed. The dryer comes with a
mains connecting cable already installed (6 ft ).
The electrical power supply must have a breaker
equipped with ground fault protection.
The sizing of the electrical supply wiring should be
properly sized for the electrical specification for the
dryer model being installed. The ambient
temperature, voltage, length of wiring and all
applicable local electrical codes should all be
considered whe sizing the electrical wiring.
It is mandatory to ensure the connection to
the ground terminal.
3.7 INLET FILTER CONDENSATE
DRAIN
The condensate is discharged at the same
pressure of the air entering the dryer.
Never point the condensate drain jet
towards anybody.
The dryer is already supplied with ¼” flexible hose to
be connected to the Collecting device (Oil/water
separator).
Connect and properly fasten the condensate drain to
a collecting plant or container.
The drain cannot be connected to pressurised
systems.
Table 3-3: Sizing a Dryer—How to find the air flow capacity
Air Flow Capacity = Nominal Capacity of Dryer X Factor F1 X Factor F2
Table 3-4: Example Solution
241.8 (Air Flow Capacity) = 250 SCFM X 1.04 (F1) X 0.93 (F2)
Air Flow Capacity= 241.8 SCFM. This is the maximum air flow rate that the dryer can accept under those operating conditions.
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