SPX FLOW Deltech ZP Series User Manual

28
7.0 Maintenance
WARNING - This equipment is a pressure-containing
device. Depressurize before servicing.
NOTE: The Dryer Controller is equipped with Service
Reminder functions for lters, desiccant and valves.
7.1 Desiccant Replacement
NOTE: The use of the correct replacement desiccant
is necessary for proper dryer operation. Never use
hygroscopic salts of the type commonly used in
“deliquescent ” type dryers.
1. 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 ltering of the inlet air will extend
the life of the desiccant. Typically desiccant life is 2
years.
2. Procedure for Desiccant Charge Replacement
a. Depressurize and de-energize the dryer.
b. Remove the ll and drain plugs or anges (where
applicable) from the desiccant tower and drain the
spent desiccant. Place a container at the base of
the vessel to collect the desiccant. If necessary
tap the sides of the vessels with a rubber mallet
to loosen desiccant.
NOTE: Use extreme care when inserting rods or
other tools through the desiccant ll or drain ports
to loosen packed desiccant. Internal ow diffusers
at the ends of the desiccant beds can be damaged
or punctured by sharp instruments. These diffusers
are necessary to distribute the airow and keep the
desiccant beads within the tower. Desiccant beads in
exhaust mufers, afterlters, or the piping connected
to the desiccant towers may indicate a perforation of
a diffuser.
c. Replace the drain plug using Teon tape or another
pipe thread sealant suitable for compressed air
service. Reinstall drain port ange cover (where
applicable) in each desiccant tower.
d. Refer to Table 1 (on page 5) for desiccant quan-
tity per tower.
When using Table 1 you will nd the desiccant
quantities listed in layers. Each layer will vary in
depth due to the type, quantity and purpose of the
desiccant. Layer 1 must be installed rst at the
bottom of the vessel followed by layer number 2
etc., until the complete charge of desiccant has
been installed.
e. Utilizing an appropriate sized funnel, ll each
desiccant tower as follows:
1) Install the required quantity of tabular support
(model 4300 only) or activated alumina in
layer 1 of each tower.
2) Level layer 1 and each subsequent layer of
desiccant as added to each tower.
3) Finish lling each tower with desiccant until
all desiccant has been installed. LIGHT tap-
ping on the tower sides with a soft-face mallet
should yield additional free space to allow
installation of all desiccant required. DO NOT
TAMP OR RAM DESICCANT.
f. Clean the ll port closure. Replace the ll plug
using Teon tape or another pipe thread sealant
suitable for compressed air service. Reinstall ll
port ange cover (where applicable) in desiccant
tower.
3. Insuring Desiccant Dryness
Replacement desiccant is shipped in airtight
containers. Keep the covers on these containers
tightly closed until use to avoid moisture
contamination. If desiccant is exposed to air it can
be heated in an oven at 400°F (204°C) for four hours
before use. Alternatively, if the dryer is not relled
with dry desiccant, it may be necessary to operate
the unit with an inlet ow rate of less than 50% of
maximum rated inlet capacity until the desiccant has
regenerated fully.
7.2 Purge Mufers
Purge mufers should be checked regularly, changed
annually. Mufer disseminator elements become clogged
with desiccant dust over time, creating back pressure
and restricted purge ow.
7.3 Valves
1. Process and pilot valves should be checked fre-
quently for leaks and proper operation.
2. Purge pressure adjustment valve should be checked
frequently for proper adjustment.
7.4 Pilot Air Filter Element Replacement
1. Frequency of replacement
The pilot air lter contains a lter element that should
be changed yearly. Replacement may be required
sooner if pressure drop across cartridge prevents
valves from actuating properly.
WARNING – The pilot air lter housing is a pressure-
containing device, depressurize before servicing.
Slowly open manual drain valve on bottom of lter
bowl by turning clockwise to verify that the housing
is depressurized before removing bowl.

SPX FLOW Deltech ZP Series Specifications

General

Brand	SPX FLOW
Model	Deltech ZP Series
Category	Dehumidifier
Language	English