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Models 35 to 50 scfm: The Power On/Off switch illumi-
nates when in the "On" position indicating power is sup-
plied to the dryer.
High Evaporator Indicator
The high evaporator indicator is a blue/green/red rotat-
ing indicator located between the expansion valve and
the chiller. Blue indicates the temperature inside the
evaporator (chiller) is too low, green indicates normal
operation and red indicates the temperature is too high. It
is normal for this indicator to be in the red zone when
the dryer is first turned on and remain there until the re-
frigeration system has reached its normal operating tem-
perature. If the indicator is in the red zone during normal
dryer operation, turn the dryer off to avoid compressor
damage. Refer to the Field Service Guide, page 1-5, for
additional information,or call your local distributor.
START-UP
Follow the procedure below to start your dryer. Failure
to follow the prescribed start-up procedure will invali-
date the warranty. If problems arise during start-up, call
your distributor.
Drain connections must be made before the dryer can be
operated. The dryers are fully automatic and require no
auxiliary controls.
1. Connect inlet and outlet lines to the dryer with the
proper fittings.
2. Plug the power cord into a 115/1/60 or 100/1/50
grounded receptacle. For models 7 to 25 scfm, the
power indicator on the plug end should illuminate.
3. For models 35 to50 scfm, turn the power on/off
switch to on. The switch should illuminate.
4. After the dryer has been running for 30 minutes:
Check the High Evaporator Indicator. If the indi-
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cator is in the red zone, unplug the dryer. Refer to
the Field Service Guide, page 1-5, for additional
information, or call your local distributor.
Confirm that condensate is discharging from the
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drain. This can only be done when there is air
flow through the dryer.
The dryer is designed to run continuously. Let the dryer
run even when the demand for compressed air is inter-
rupted; the dryer will not freeze up.
SHUTDOWN
When the dryer must be shutdown for maintenance or
other reasons, use the following procedure.
1. For models 35 to 50 scfm, turn the power on/off
switch to off. The switch light should extinguish.
1-4
2. Unplug the power cord. For models 7 to 25 scfm, the
plug end of the power cord should extinguish.
DANGER
Disconnect supply power to the dryer before
servicing the dryer.
Dismantling or working on any component of
the compressed air system under pressure may
cause equipment failure and serious personal
injury. Before dismantling any part of the dryer
or compressed air system, completely vent the
internal pressure to the atmosphere.
If mechanical repairs are to be made or service is per-
formed, vent the internal pressure of the dryer to atmos-
pheric pressure.
Restart the dryer according to the start-up instructions.
MAINTENANCE
SDR Series refrigerated dryers require little maintenance
for satisfactory operation. Good dryer performance can
be expected if the following routine maintenance steps
are taken.
DANGER
Disconnect supply power to the dryer before
performing any maintenance on the dryer.
Before dismantling any part of the dryer or
compressed air system, completely vent the
internal pressure to the atmosphere.
General
For continued good performance of your refrigerated
dryer, all refrigeration system maintenance should be
performed by a competent refrigeration mechanic.
Before corrective maintenance is done during
the warranty period, call your local distributor
and proceed according to instructions. Refer to
the warranty for limits of your coverage.
Daily Maintenance
Check the separator for condensate discharge. If no dis-
charge is evident, depressurize, dismantle and clean or
replace the separator float.
Monthly Maintenance
Inspect the condenser coils. Remove accumulated dust
and dirt with a soft brush or with air from an OSHA-
approved compressed air nozzle that limits the discharge
pressure to 30 psig.
Note
SDR Series (Bulletin 546)
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