Prefilter/Afterfilter Maintenance - Deltech SPX Flow DSHD Series Instruction Manual

7.7

Prefilter/Afterfilter Maintenance

A. Element Replacement
1. For maximum filtration efficiency, replace element an-
nually or when pressure drop reaches 4.3 psi (0.3 bar)
(indicator in red area), whichever occurs first.
B. Procedure for Element Replacement
WARNING: THIS FILTER IS A PRESSURE CONTAINING DEVICE.
DEPRESSURIZE BEFORE SERVICING.
1. Isolate filter (close inlet and outlet valves if installed) or
shut off air supply.
2. Depressurize filter by slowly opening manual drain valve.
3. Remove bowl by unscrewing the bowl from the filter
head using hand, strap wrench or C spanner, and pulling
bowl straight down.
4. Clean filter bowl.
5. Replacing complete element.
a) Pull off old element and discard.
b) Make certain that the old and new element have the
same part number and the end caps are the same
color.
c) Wipe the wall inside the filter head to remove any
dirt.
d) Lubricate the new element o-ring on the element
top cap.
e) Align the slot in the element top cap with the projec-
tion inside the filter head.
Projection
Element Slot
O-Ring
12
f) Insert the element into the head making sure the
element slot and the projection inside the filter head
remain aligned.
NOTE: Handle all elements by bottom end cap only.
6. Replace housing o-ring (located at the top of the filter
bowl) if needed. Make certain o-ring is generously
lubricated (Use lubricant provided).
7. Reassemble bowl to head.
NOTE: Threaded bowl to head connection, generously
lubricate threads with a high grade/temperature lubri-
cant 150°F (66°C). (Use lubricant provided)
C. Auto Drain Mechanism Replacement
Prefilter only: It is recommended that drain mechanism be
replaced annually.