Section 5 Start Up
Please read and understand the entire manual before operating the dryer.
Check and read over wiring diagrams that pertain to your unit and make sure the correct power supply
is connected, but do not energize circuit at this time. Provide proper short circuit protection. Follow all
applicable codes.
If you do NOT want the dryer to cycle automatically when energized, close the control air isolation valve.
If the system has already been pressurized, bleed off the control air pressure by opening the knob on
the bottom of the control air filter and reclosing.
Before starting the dryer your compressor should be running, your air system pressurized and the dryer
bypassed and not yet pressurized.
SLOWLY open the inlet isolation valve admitting com- pressed air to the dryer. It is important to
pressurize the dryer slowly to prevent fluidization of the desiccant bed. The dryer outlet isolation valve
should be closed at this time.
SLOWLY open dryer outlet isolation valve. At this point all valves are in “normal” positions; air is
flowing through both towers and downstream.
Close the dryer bypass valve. Bypass valves must be bubble tight to prevent moisture from migrating
around the dryer and contaminating the dry air outlet.
It is required that the dryer be started without the mufflers installed. This will expedite removal of excess
desiccant dust and prevent premature clogging of the exhaust mufflers.
CAUTION: USE EAR AND EYE PROTECTION WHEN OPERATING DRYER WITHOUT MUFFLERS.
EXCESSIVE NOISE WILL BE CREATED. DUST AND PARTICLES FROM THE SURROUNDING
AREA MAY BECOME AIRBORNE. OPERATION WITHOUT MUFFLERS EXCEEDS OSHA LIMITS.
Check the Variable Cycle Control setting. It should normally be set at the standard 10 minute, 100%
load.
Energize the electrical circuit. If the control air valve is open the dryer will begin to cycle.
If the control air valve is closed, open it to begin the dryer cycle. At this point one tower will exhaust its air
to atmosphere. See “CAUTION” statement above.
Check and adjust the setting of the purge pressure indicator or purge flow meter in accordance with the
specifications for your dryer. Normally, purge flow is approximately 15% of design flow for the dryer. Note
that even if you are operating under a light load the purge can not be reduced if you are operating in the
PowerLoc, Pro Purge or Cycle Loc modes, or a fixed timed cycle other than the standard 10 minute,
100% load cycle.
Section 6 Operational Notes
Never service the dryer or filters without first relieving pressure.
Check all air connections for leaks and tighten as required. Downstream air leaks will affect dew point.
Bypass air leaks will affect dew point. Only soft seat bypass valves may be used.
Dryer will not perform without proper pre-filtration, condensate drainage, and purge flow. Dryers may
require up to 48 hours of operation to reach normal operating dew points. Therefore, indicators and/or
alarms should not be recognized until that time. Applications requiring dew points lower than -40°F, or
with nonstandard operating conditions, may require additional time to reach equilibrium.
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