JOHNSON CONTROLS
75
SECTION 3 - MAINTENANCE
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
3
ECONO-DISK
®
Maintenance Instructions
By design the ECONO-DISK
®
is inherently mainte-
nance free.
The mechanism has an integral mechanical stop to pre-
vent over travel of the disk at both extremes. The disk
is supported by a solid type 416 ground stainless steel
shaft and two permanently lubricated bronze bearings.
The operating linkage is permanently lubricated and
requires no more than occasional routine inspection.
P-CONE
®
Maintenance of P-Cone
®
Basic P-Cone
®
maintenance involves keeping the eight
tiny pressure pickup holes, in the flange and throat of
the inlet cone, free from blockage or debris buildup
and periodically checking the tubing and fittings at-
tached outside the P-Cone
®
for wear or damage.
In addition, periodically back-flushing each line gently
with compressed air may help to blowout debris in the
line and pressure pickup holes. It is helpful to keep the
inside surface of the cone clean; especially in a one
inch radius immediately around the pressure pick-up
holes.
In the unlikely event that the pneumatic tubing on the
P-Cone
®
is damaged, simply remove the damaged sec-
tion and replace with comparable type of tubing.
Pressure differential on tubing is less
than 1 psig.
In the unlikely event that one of the brass fittings,
which is sweated to the P-Cone
®
, breaks loose from the
P-Cone
®
, then simply remove that fitting and replace it
with a straight coupling fitting of similar and common
sort. In this event, do not attempt to re-solder the fitting
to the P-Cone
®
.
There are four pickup holes on each piezometer ring.
Elimination of one of them will not adversely affect the
performance of most P-Cone
®
.
CONNECT TO HIGH PRESSURE SIDE
CONNECT TO LOW PRESSURE SIDE
LD010164
FIGURE 78 -
PLENUM FAN TAP LOCATION AND
CONNECTION ILLUSTRATION
