Sullair SD Series User manual

USER MANUAL
SD2000 – SD3400
DDS OPTION
LDP OPTION
3V OPTION
SD Heatless Desiccant
Compressed Air Dryers
SERIES SD

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 2
TABLE OF CONTENTS
FOREWORD................................................................................................................................. 4
SECTION 1 INTRODUCTION.................................................................................................... 5
1.1 GENERAL INFORMATION.............................................................................................. 5
1.2 SAFETY INSTRUCTIONS................................................................................................. 5
1.2.1 Identification of signs and symbols in this technical manual.............................................. 6
1.2.2 Safety tips for maintenance, inspection and assembly work............................................. 6
1.3 PERSONNEL QUALIFICATION ...................................................................................... 7
1.4 PRODUCT INFORMATION.............................................................................................. 8
1.4.1 Pressure vessel regulations............................................................................................. 8
1.4.2 Airtightness test............................................................................................................. 8
1.4.3 Overloading.................................................................................................................. 8
1.4.4 Technical data sheet...................................................................................................... 9
1.4.5 Transport.................................................................................................................... 11
1.4.6 Storage....................................................................................................................... 11
1.4.7 Use of a pre and after filter.......................................................................................... 11
SECTION 2 INSTALLATION................................................................................................... 12
2.1 SET-UP AND INSTALLATION....................................................................................... 12
SECTION 3 START UP AND OPERATION.......................................................................... 13
3.1 START UP/ SHUT DOWN ............................................................................................... 13
3.2 DESCRIPTION OF THE OPERATION ........................................................................... 13
3.2.1 Description of the operation......................................................................................... 14
3.2.2 Dryer operating sequence (No control or alarm option)................................................ 15
3.2.3 Operating sequence (DDS Option).............................................................................. 17
3.2.4 Alarms........................................................................................................................ 19
3.2.5 Electrical control......................................................................................................... 20
3.3 SPECIAL EQUIPMENT................................................................................................... 20
3.3.1 DDS Controls............................................................................................................. 20
3.3.2 DDS Controls – Start up and operation....................................................................... 21
SECTION 4 MAINTENANCE.................................................................................................. 22
4.1 REPLACEMENT OF THE DESICCANT......................................................................... 24
4.2 DISPOSAL OF THE DESICCANT.................................................................................. 24
4.3 CHANGING OF THE REGENERATION ORIFICE........................................................ 24
4.4 FILTERS............................................................................................................................ 25
4.4.1 General comments and use.......................................................................................... 25
4.4.2 Function...................................................................................................................... 25
4.4.3 Assembly and installation............................................................................................. 25
4.4.4 Maintenance ............................................................................................................... 25
4.4.5 Changing of filter elements........................................................................................... 26

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 3
4.4.6 Accessories ................................................................................................................ 26
SECTION 5 DRYER FLOW CAPACITY AND PURGE ADJUSTMENT............................ 27
5.1 DRYER FLOW CAPACITY............................................................................................. 27
5.2 CORRECTION FACTOR FOR INLET TEMPERATURE................................................ 27
5.3 PURGE ADJUSTMENT.................................................................................................... 28
5.4 PRESSURE SWITCH ADJUSTMENT............................................................................. 29
SECTION 6 SPARE PARTS LIST.......................................................................................... 30
6.1 SPARE PARTS LIST FOR SD2000 – SD3400................................................................. 30
6.2 SERVICE BULLETIN ....................................................................................................... 35
SECTION 7 TROUBLE SHOOTING & FAULTS................................................................... 52
7.1 THE DEW POINT IS TOO HIGH..................................................................................... 52
7.2 THE ADSORPTION DRYER DOES NOT SWITCH OVER............................................ 52
7.3 BACK PRESSURE IS TOO HIGH DURING REGENERATION PHASE....................... 53
7.4 SHORT-TERM SHUT-DOWN......................................................................................... 53
7.5 SHUT-DOWN IN CASE OF A FAULT OR FOR MAINTENANCE.............................. 54
7.6 RE-STARTING................................................................................................................. 54

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 4
FOREWORD
This technical manual of Sullair is an aid in getting to know the adsorption dryer better
and in utilising its possibilities for application in accordance with its intended use.
Furthermore, this manual contains important information for safe, proper and economic
operation.
All instructions must be followed as written in order to avoid danger and damages which
could cause downtime and premature wear and tear on the adsorption dryer.
In addition to the technical manual and the accident prevention regulations which are valid
and compulsory in the country and in the particular workplace where the adsorption dryer
is being used, the recognized special rules for safe and proper working procedures are
also to be heeded. The technical manual must always be within reach wherever the
adsorption dryer is being used.
Each person involved with the set-up, start-up, operation, maintenance and repair of the
adsorption dryer in the User Company must have first read and understood the technical
manual and especially the safety tips.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 5
SECTION 1 INTRODUCTION
1.1 GENERAL INFORMATION
The adsorption dryer of the SD2000 – SD3400 series is built according to the latest
technological developments and recognized safety rules. Its use however can endanger
life and limb of the user or of third parties, and can lead to considerable damage to the
adsorption dryer and other material assets if:
•it is operated by personnel not trained or instructed in its use,
•it is improperly used,
•it is improperly maintained or serviced.
This can result in the loss of all damage claims.
This adsorption dryer is designed for neutral media free of aggressive water, oil and
solid elements. Sullair accepts no liability for corrosion damage and malfunctions
caused by aggressive media.
Applications other than those mentioned in this manual must be agreed to by Sullairand
confirmed in writing.
In the interest of further development, Sullair reserves the right to make changes at any
time, which, in keeping with the essential characteristics of the adsorption dryer
described here, may be necessary for increasing efficiency or for reasons relating to
safety or to normal business practice.
1.2 SAFETY INSTRUCTIONS
This technical manual contains basic tips, which must be followed during set-up,
operation and servicing. It is thus of utmost importance that it be read by the assembly
technician before installation and start-up as well as by the specialist / operator in
charge, and it must always be within reach at the place where the adsorption dryer is
being used.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 6
SECTION 1
1.2.1 Identification of signs and symbols in this technical manual
The safety tips contained in this technical manual, whose disregard could endanger
people and machines, are indicated by a general danger sign and the additional
markings Danger!or Attention!
410
Danger! / Attention!
Safety sign in accordance with DIN 4844 - W9
Warning against electrical voltage!
Safety sign in accordance with DIN 4844 - W8
Safety tips printed directly on the adsorption dryer must be heeded at all times and must
be kept completely legible.
*Advices
This sign refers to a procedure or sequence of particular interest or importance.
All tips must be followed to ensure proper use of this adsorption dryer.
•This dot refers to working or operational steps. The steps are to be carried out in the
order of their appearance from top to bottom.
•The sign of a hyphen marks enumerations.
1.2.2 Safety tips for maintenance, inspection and assembly work
The operator is to make sure that all maintenance, inspection and assembly work is
carried out by special personnel who are authorized and qualified, and who are
adequately informed through careful study of the technical manual. For this reason,
special attention should be paid to the following attention and danger sign:

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 7
SECTION 1
Attention!
−
Never make structural changes to the adsorption
dryer!
−Only use original spare and accessory parts!
−
Never weld on a pressure vessel or change it in any
way!
Carry out maintenance work only when the adsorption
dryer is switched off, is depressurized and disconnected
from the electric power supply.
*Advices
Refer to the desiccant material safety data sheet (MSDS) when installing or
disposing of desiccant.
Danger!
Wear protective goggles when working with the
desiccant!
*Advices for protection
−If desiccant comes into contact with the eyes, rinse eyes immediately with a lot of clear
water.
−If the desiccant is spilled, clean up without causing swirls of dust.
−In case of fire, there is no restriction on the use of fire extinguishing material; the
reaction with water and foam is defined as strong.
−A mask must be worn.
1.3 PERSONNEL QUALIFICATION
The personnel involved in operation, maintenance, inspection and assembly must have
the corresponding qualifications to do this work. Areas of responsibility and supervision
of the personnel must be precisely established by the operator. Should the personnel not
possess the necessary knowledge, then they must be trained and instructed. If need be,
this training may be carried out by the manufacturer / supplier at the request of the
operator of the adsorption dryer. Further, the operator is to make sure that the personnel
completely understand the contents of the technical manual.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 8
SECTION 1
1.4 PRODUCT INFORMATION
The adsorption dryer is used for the purpose of drying compressed air and other gases
according to its respective design. As a "standard model" the adsorption dryer is
equipped with two desiccant vessels and a pre- and after-filter, and depending on certain
conditions at the outlet, provides pure, dry and oil-free compressed air or gases.
1.4.1 Pressure vessel regulations
The pressure vessels are designed according to the standard technical requirements.
They fulfill the test of the certifying procedure and carry the“U”, “UM” ASME Symbol.
Range of application
Type SD2000 – SD3400
Operating overpressure Max. 150 PSIG
Temperature Max.
Min.
500 °F
-20 °F
1.4.2 Airtightness test
All adsorption dryers are subjected to an airtightness test prior to shipment using
compressed air.
1.4.3 Overloading
Attention!
Protect the adsorption dryer from overloads!
The adsorption dryer can become overloaded, if:
−The flow capacity of the medium to be dried
increases,
−The temperature of the air at entry, and
correspondingly its humidity increases,
−The min. operating pressure is under cut,
−The pre-filtration and separation of impurities are
not sufficient.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 9
SECTION 1
1.4.4 Technical data sheet
Type SD2000 SD2350 SD2750 SD3400
Medium Air, free of aggressive elements
Connection FLG – 150# 4” 4” 6” 6”
Flow capacity (1) (STD)
SCFM 2000 2350 2750 3400
Flow capacity (1) (LDP)
SCFM 1400 1645 1925 2380
Desiccant
Standard Input temp.: from 100°F and dew point (2) -40°F (-40°C)
Filled with: activated alumina
LDP Dryers Input temp.: from 100°F and dew point (2) -100°F (-73°C)
Filled with: activated alumina
Quantity of desiccant
Per vessel [Lbs.] 1100 1350 1500 2000
Filter size PH/PR 2100 PH/PR 2750 PH/PR 2750 PH/PR 4100
Control PLC Controller
Operating voltage
Standard 120 V / 60 Hz (AC)
Special voltage Consult factory
Drying time
Standard 5 min
LDP Dryers 2 min
(1) Flow capacity in SCFM at 100 PSIG according to DIN ISO 7183
(2) Pressure dew point
NOTE: Settings for DDS:
Standard dryers DDS Control -43°F(-41°C) High humidity –33°F (-36°C)
LDP Dryers DDS Control -100°F(-74°C) High humidity –92°F(-69°C)

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 10

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 11
SECTION 1
1.4.5 Transport
After the adsorption dryer has been delivered, it must be checked for damage that may
have occurred during transport. If necessary, the Transport company must be informed
to register the damage.
*Advices
For transport within the company, only the skid of the adsorption dryers
SD2000 – SD3400 may be used.
1.4.6 Storage
If the adsorption dryer is to be stored for a longer period of time, its place of storage must
be dry and free of dust. There has to be a min. ambient temp. of +33°F (1°C).
1.4.7 Use of a pre and after filter
In order to prevent droplets of condensate, oil and dirt from getting into the desiccant, a
pre-filter needs tobe installed in front of the adsorption dryer, since an oil film on the
desiccant reduces the drying capacity and thedewpoint. In order to prevent breakdowns
in downstream consumers caused by material that has been abraded from the desiccant
bed, an after-filter needs to be installed behind the adsorption dryer. Since no
condensate accumulates in the after-filter, this filter is always equipped with a manual
valve.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 12
SECTION 2 INSTALLATION
2.1 SET-UP AND INSTALLATION
Once at the installation location, the adsorption dryers of the series SD2000 – SD3400,
which are supplied with a base frame, must be positioned so that the side from which it
is to be operated is easily accessible. The piping is to be connected to the adsorption
dryer at a light slope. A shut-off valve is to be installed on the inlet and outlet sides of the
adsorption dryer. Also, a by-pass pipe with an additional shut-off valve should be
mounted onto the adsorption dryer, in order to be able to guarantee an uninterrupted
supply of compressed air in case the adsorption dryer breaks down. Should vibrations
occur on the installation location, the adsorption dryer is to be placed onto vibration
dampers.
Since the adsorption dryer has already been completely wired at our factory, the
customer only has to connect the power supply cable to the terminal strip according to
the supplied wiring diagrams.
*Advice
Should you still have questions regarding installation, you can request
installation blueprints separately from Sullair.
NOTE :On dryers size SD2750 and SD3400, the purge exhaust mufflers are not
supplied.
Connect the purge exhaust “flanged” ports to an exhaust header. The
exhaust header piping size must not be smaller than the flange connection
size (in this case 3” piping).
The noise obtained at the exit of the purge exhaust header can exceed
100 DBA and the velocity of the discharge will be high. The discharge
exhaust piping should be piped to an area where the noise will be
tolerated.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 13
SECTION 3 START UP AND OPERATION
3.1 START UP/ SHUT DOWN
Attention!
All pipes and wire connections are to be tightened!
Furthermore, before start-up:
−The pipes must be checked for the presence of scale,
abraded material from the threading, or other similar
impurities.
−
All shut off valves on the pre-filter, adsorption dryer, after-
filter and on the bypass line should be closed.
−The ambient temperature must not be less than 33°F.
Breakdowns resulting from faulty installation do not fall under Sullair warranty obligation.
*Advices
The following sequence is to be heeded for the initial start-up:
•Slowly open the inlet valve and observe the pressure build-up on the
chamber pressure gauges of the adsorption dryer. A too abrupt pressure
build-up is to be avoided
•Turn the switch to the "POWER ON" position..
•The adsorption dryer must be powered approx. 3-4 h with the shut off valve
behind the after-filter closed; this regenerates the desiccant.
•After the regeneration phase, open the shut off valve behind the after-filter
slowly while observing the chamber pressure gauge; if the shut off valve is
opened too abruptly, it could put a stress on the system.
•The adsorption dryer is now ready for operation and functions continuously
and fully automatically.
3.2 DESCRIPTION OF THE OPERATION
The Sullair adsorption dryer of the series SD2000 – SD3400 functions according to the
pressure change principle, using dry air regeneration. Two adsorption vessels filled with
desiccant are installed parallel to each other for this purpose. While the medium is being
dried in one vessel, regeneration takes place in the other vessel. The changeover from
one vessel to the other is performed in a fixed rhythm by means of a time-dependent
control system. The adsorption dryer operates continuously and fully automatically.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 14
SECTION 3
3.2.1 Description of the operation
SD HEATLESS TYPE DRYER (SD2000-SD3400)
•The Sullair SD dryer has a NEMA cycle time of 10 minutes (STD) or 4 minutes (LDP)
depending upon the air quality desired. In a 10 minute cycle, 5 minutes is dedicated
to drying for each chamber (5 minutes half cycle). In a 4 minutes cycle, the half cycle
is then 2 minutes.
•Through the inlet switching valve wet air enters either desiccant chamber at the inlet
(bottom) and is dried as it flows upward through the desiccant bed. Dry air exits the
dryer through the outlet check valve.
•At the outlet of each chamber, a portion of the dry air (purge air) is diverted to the
regenerating chamber. The dry air, at near atmospheric pressure, will remove
previously adsorbed moisture as it flows downward through the desiccant bed exiting
through the purge exhaust muffler.
NOTE :On models SD2750 to SD3400 exhaust mufflers are not supplied.
See details of installation in the page 11 of this manual.
•The purge air is controlled by a purge adjusting valve and purge orifices located in the
purge line. Purge pressure can be monitored on the purge pressure gauge. Refer to
section on purge adjustment for instructions on setting the purge rate.
•Near the end of each half cycle, the chamber being regenerated will be re-
pressurized. For this to occur, the exhaust valve of the chamber being regenerated
closes while purge air continues to flow. Re-pressurizing the regenerated chamber
to operating pressure before placing it into service minimizes fluidization of the
desiccant and helps prevent desiccant abrasion which causes desiccant dust to
prematurely block pilot and after-filter elements.
•Dryers operating at pressures greater than 120-125 PSIG or in an accelerated NEMA
cycle could be fitted with a re-pressurizing valve. This valve assists the regenerated
chamber to reach dryer operating pressure before chamber switchover.
•Chamber switchover takes place when both towers are fully pressurized to minimize
desiccant movement.
When switchover is complete, the regenerated tower will be placed into service and the
exhausted tower will begin adepressurization/regeneration cycle.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 15
SECTION 3
3.2.2 Dryer operating sequence (No control or alarm option)
The Sullair SD2000 –SD3400heatless air dryers use a SIEMENS PLC as its standard
controller. In the event of a power failure, the exhaust valves will close and the dryer will
pressurize both chambers. Since this control panel uses retentive programming the dryer
will return to the same step in the cycle the dryer was in before power was lost.
Energizing control panel : Power is turned ON – electrical circuit energized.
STEP 1 SELECT LEFT CHAMBER DRYING.
- De-energize solenoid EV-1R.
- Energize solenoid EV-1L.
- Inlet valve positioned for left chamber drying.
- 3 seconds time delay, proceedto STEP 2
STEP 2 RIGHT CHAMBER DEPRESSURIZATION.
- Keep energized Solenoid EV-1L
- Energize Solenoid EV-2R opening right chamber depress valve.
- At 30 PSIG falling pressure, energize EV-4R opening right chamber
exhaust valve.
- Regeneration timer counts regeneration time. When complete, proceed
to STEP 3
STEP 3 CHAMBER REPRESSURIZATION.
- Keep energized EV-1L.
- De–energize EV-2R closes right chamber depress valve.
- De–energize EV-4R closes right chamber exhaust valve.
- The repressurization timer begins a countdown.
- The right chamber will repressurize to system operating pressure.
- When system has repressurized and repress time has passed, go to
STEP 4
STEP 4 SELECT RIGHT CHAMBER DRYING.
- De-energize solenoid EV-1L
- Energize solenoid EV-1R.
- Inlet valve positioned for right chamber drying.
- 3 seconds time delay, proceed to STEP 5

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 16
SECTION 3
3.2.2 Dryer operating sequence (No control or alarm option)– (Continued)
STEP 5 LEFT CHAMBER DEPRESSURIZATION.
- Keep energized EV-1R
- Energize Solenoid EV-2L opening left chamber depress valve.
- At 30 PSIG falling pressure, energize EV-4L opening left chamber
exhaust valve.
- Regeneration timer counts regeneration time. When complete, proceed
to STEP 6
STEP 6 CHAMBER REPRESSURIZATION.
- Keep energized Solenoid EV-1R.
- De–energize Solenoid EV-2L closes left chamber depress valve.
- De–energize Solenoid EV-4L closes left chamber exhaust valve.
- The repressurization timer begins a countdown.
- The left chamber will repressurize to system operating pressure.
-When system has repressurized and repress time has passed, go to
STEP 1
The dryer has completed 1 full cycle and will repeat steps 1 through 6 until power is
removed from the control panel.

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 17
SECTION 3
3.2.3 Operating sequence (DDS Option)
The Sullair SD2000-DDS – SD3400-DDS and all “LDP” heatless air dryer uses a
Siemens PLC as its standard controller. In the event of a power failure, the exhaust
valves will close and dryer will pressurize both chambers. Since this control panel uses
retentive programming, the dryer will return to the same step in the cycle dryer was in
before power was lost. (See NOTE 2)
Energizing control panel: Power is turned ON – electrical circuit energized.
STEP 1 SELECT LEFT CHAMBER DRYING.
- De-energize solenoid EV-1R.
- Energize solenoid EV-1L.
- Inlet valve positioned for left chamber drying.
- 3 seconds time delay, proceedto STEP 2
STEP 2 RIGHT CHAMBER DEPRESSURIZATION.
- Keep energized Solenoid EV-1L
If not in DDS mode:
- Energize Solenoid EV-2R opening right chamber depress valve.
- At 30 PSIG falling pressure, energize EV-4R opening right chamber
exhaust valve.
If in DDS mode anddewpoint is better than hygrometer setpoint:
- Solenoid EV-2R and EV-4R will not energize, right chamber will not
depressurize.
- Regeneration timer counts regeneration time. When complete, proceed
to STEP 3
STEP 3 CHAMBER REPRESSURIZATION.
- Keep energized EV-1L.
- De–energize EV-2R closes right chamber depress valve.
- De–energize EV-4R closes right chamber exhaust valve.
- The repressurization timer begins a countdown (See note 1).
- The right chamber will repressurize to system operating pressure.
- When system has repressurized and repress time has passed, go to
STEP 4

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 18
SECTION 3
3.2.3 Operating sequence (DDS Option– (Continued)
STEP 4 SELECT RIGHT CHAMBER DRYING.
- De-energize solenoid EV-1L
- Energize solenoid EV-1R.
- Inlet valve positioned for right chamber drying.
- 3 seconds time delay, proceed to STEP 5
STEP 5 LEFT CHAMBER DEPRESSURIZATION.
-Keep energized EV-1R
If not in DDS mode:
- Energize Solenoid EV-2L opening left chamber depress valve.
- At 30 PSIG falling pressure, energize EV-4L opening left chamber
exhaust valve.
If in DDS mode anddewpoint is better than hygrometer setpoint:
- Solenoid EV-2L and EV-4L will not energize, left chamber will not
depressurize.
- Regeneration timer counts regeneration time. When complete, proceed
to STEP 6
STEP 6 CHAMBER REPRESSURIZATION.
- Keep energized Solenoid EV-1R.
- De–energize Solenoid EV-2L closes left chamber depress valve.
- De–energize Solenoid EV-4L closes left chamber exhaust valve.
- The repressurization timer begins a countdown (See note1).
- The left chamber will repressurize to system operating pressure.
- When system has repressurized and repress time has passed, go to
STEP 1
The dryer has completed 1 full cycle and will repeat steps 1 through 6 until power is
removed from the control panel.
NOTE 1:EV-3 and repress valves could be used if dryer operating at pressure
above 125 PSI (G) and / or dryer operating on a timing cycle other than 10
minute cycle. Refer to the specification sheet in this manual or to the flow
schematic supplied with the dryer.
NOTE 2:If power failure occurs to the dryer or unit is turned off, both exhaust valves
will close. The inlet valve will remain in its position.
NOTE 3: The actual timer setting may differ from the previously noted sequence.
Example: A dryer requiring 30 seconds to re-pressurize the regenerating

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 19
chamber will have a regeneration time of 4 minutes and 30 seconds. The
half cycle time will remain at 5 minutes and full cycle at 10 minutes.
SECTION 3
3.2.3 Operating sequence (DDS Option– (Continued)
NOTE 4: The regeneration andrepressurizationtimes should be adjusted by Sullair
trained personnel only. Changing the factory settings will result in loss of
dew point and/or failure torepressurize before changeover.
3.2.4 Alarms
** If any alarms options are supplied with dryer then a PLC will control the timing of the
dryer.
COMMON ALARM RELAY
Common alarm relay comes with any optional alarm. If any one of the alarms are
activated, the common alarm relay will also be activated.
SWITCHING FAILURE ALARM (OPTIONAL, INCLUDED WITH DDS OPTION)
Two pressure switches, sensing desiccant chamber pressure, are provided. An alarm
will be activated if both chambers remain at full pressure when regeneration is required.
Furthermore, if pressure in both chambers remain below set pressure, after
depressurization an alarm will be activated.
NOTE:Dryers equipped with DDS and operating in the DDS mode do not
depressurize during the purge cycle (and do not purge) when an
acceptable dew point is maintained. During this condition the switching
failure alarm is cancelled.
The alarm has a 1-minute delay.
HIGH HUMIDITY ALARM (OPTIONAL, INCLUDED WITH DDS OPTION)
The hygrometer provided has been programmed to initiate an alarm if the dryer outlet
dew point falls below the setting. An alarm light is provided.
NOTE:The alarm has a 20-minute delay when the dryer is first powered up, then
the alarm is instant if the condition exists.
IF THE HYGROMETER BOARD TO PROBE CONNECTION FAILS,

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-2000 / SD-3400
REV 1 – October 29th,.2001
Page 20
Then a fault will observed by the hygrometer. The high humidity alarm light will flash on
and off. The dryer will go into a fixed cycle mode. The digital display will indicate “OPN”.
SECTION 3
3.2.5 Electrical control
Danger!
Work on electrical installations may only be done by a
specialist or by other persons instructed in this type of
work as long as they are under the instruction and
supervision of a specialist; the general rules for working
with electricity must be followed!
You find the corresponding operating and control voltage on the data sheet.
The Sullair adsorption dryer of the SD series is normally operated with a PLC controller.
The set times are adjusted at the factory during the test run. Do not change these
adjustments!
3.3 SPECIAL EQUIPMENT
3.3.1 DDS Controls
The DDS control option is an Dewpoint Dependant Switching that monitors the dryer
dewpoint performance and manages the requirement for regeneration of the dryer. The
DDS controls major components are a digital dewpoint display hygrometer and a
humidity sensor.
The Sullair type SD Air dryer is designed to provide a specific pressure dewpoint
performance (generally –40 F (-40 C)) at the most severe operating conditions specified.
(Maximum flow at lowest pressure and highest inlet temperature). The regeneration
purge flow rate required for the dryer is calculated and adjusted to achieve this dewpoint
and is based on these conditions.
For example, for dryers operating at 100 PSIG (690kPa) and 100 F (38 C) the purge
flow rate is approximately 15% of the specified maximum inlet flow. Dryers operating
under less severe inlet conditions will introduce a reduced humidity load. The DDS
controls have been factory programmed to monitor the dryer outlet dewpointperformance
and prevent initiation of a regeneration cycle under these conditions.
The DDS controls system has the following standard features, refer to the enclosed
technical bulletin for a complete overview of the digital hygrometer display.
 Programmable alarm relays (DDS and High Humidity Alarm).