Servicing And Maintenance; Nameplate; Ordering Consumable Parts And Operating Materials; Weekly Maintenance - Deltech SPX Flow DSHD Series Instruction Manual

7.0

Servicing and Maintenance

WARNING – The heatless desiccant dryer is a pressure
containing device. Depressurize the dryer before servic-
ing or repairing. (See section 7.5.)
ATTENTION!
Before starting any service work ensure all power is isolated
from the dryer. A power plug (if fitted) should be unplugged.
7.1

Nameplate

The nameplate contains all information to identify your dryer.
Please provide the information from the nameplate with every
enquiry and when ordering replacement parts.
7.2 Ordering Consumable Parts and Operating
Materials
Use only genuine replacement parts from the manufacturer.
The manufacturer bears no responsibility for hazards caused
by the use of unauthorized parts .
WARNING – There is risk of personal injury or damage to
the machine resulting from the use of unsuitable spares
or operating materials. Unsuitable or poor quality con-
sumable parts and operating materials may damage the
machine or impair its proper function. Personal injury
may result from damage.
For continued good performance of your dryer, all regular
dryer maintenance should be performed by an authorized
service technician.
7.3

Weekly Maintenance

NOTE: The components specified in parentheses (e.g. B006)
refer to the P&I-schematic diagram.
A. Check the residual pressure in the tubes (B006 and B007)
during the regeneration with the gauges (PI018 and PI019).
B. If the residual pressure level rises above 0.3 bar/ 4.4psi, the
purge mufflers must be replaced.
1) Switch off the dryer (see chapter 5. "Switching off the
dryer").
2) Replace the purge mufflers.
3) Switch on the dryer.
C. Check the differential pressure gauge from the pre- and
after filter (F001, F012) (see instruction manual filter).
Replacement filter elements (see section 7.4 "Annual
maintenance").
D. Check the automatically condensate drain at the pre-filter.
7.4

Annual Maintenance

NOTE: The components specified in parentheses (e.g. B006)
refer to the P&I-schematic diagram.
A. Replace the filter cartridges from the pre- and after filter
(F001 and F012).
1) Depressurize the dryer (see chapter 7.5 "Depressurizing
the desiccant dryer").
2) Switch off the dryer (see chapter 5. "Switching off the
dryer").
3) Replacing the filter cartridges see filter instruction
manual.
B. Replace condensate drain.
C. Replace the purge mufflers (see section 7.3 "Weekly main-
tenance").
7.5

Depressurize the Desiccant Dryer

NOTE: The components specified in parentheses (e.g. B006)
refer to the P&I-schematic diagram.
A. Close the shut-off devices in the compressed-air inlet- and
outlet line.
B. Let the desiccant dryer run through a complete tower
change cycle or until all air has been exhausted from the
dryer.
C. Check the residual pressure in the tubes (PI018 and PI019).
7.6

Replacement of Desiccant

A. Frequency Of Desiccant Replacement
Desiccant should be replaced whenever the required dew
point cannot be maintained while the dryer is being operated
within its design conditions and there are no mechanical
malfunctions.
NOTE: Desiccant life is determined by the quality of the
inlet air. Proper filtering of the inlet air will extend the life
of the desiccant. Typically desiccant life is 2 years.
B. Procedure for Desiccant Charge Replacement
1. Depressurize the dryer (see chapter 7.5 "Depressurizing
the desiccant dryer").
2. Switch off the dryer (see chapter 5. "Switching off the
dryer").
3. Remove the front panel of the dryer.
4. Loosen the nuts / washers of the upper manifold and
remove it.
5. Remove the gasket and metal mesh. Remove the
threaded rods.
6. Remove the aluminum profiles and remove the cartridge
with the aid of the attached knurled screw.
7. Replace the lower metal mesh and gaskets and reas-
semble the new threaded rods and profiles back.
8. Insert the cartridges and replace the upper metal mesh
and gaskets.
9. Mount the distributor block and the front plate of the
dryer.
10. Torque:
DSHD-7 - DSHD-21: 15Nm (nuts/ threaded rods)
DSHD-27 - DSHD-40: 20Nm (nuts/ threaded rods)
11. After replacing the desiccant, restart the dryer as de-
scribed in chapter 6.
IMPORTANT: Keep the desiccant cartridges with the new desic-
cant closed until they are used, to avoid moisture contamination.

7.6.1 Replacement of Purge Solenoid Valves

NOTE: The components specified in parentheses (e.g. B006)
refer to the P&I-schematic diagram.
A. Change solenoid purge valves (V014/V015) after 5 years of
full operation.
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