YarwaY
Operating and Safety inStructiOnS
Pneumatic actuator
warNING
For safety reasons, it is important to take the
following precautions before you start work
on the PDA*:
1. Read all labels fitted to the PDA* and
this sheet before installation, operation
or maintenance.
2. Use PDA* for the intended purpose
(according contract/specification).
3. Remove the PDA* carefully from its packaging,
lifting by means of straps (heavy weight)
around the body or use the hoisting lug.
4. The hoisting lug is for the actuator only,
not for the total assembly!!!
5. For installation of the PDA* use bolting
material (2 half-couplings and lock nut; parts
of the Desuperheater) and free of 'forces,
moments and torques'.
6. Additional mounting/modifications on PDA's*
are not allowed without approval from Yarway.
7. The line must be depressurized, drained,
vented and cooled down before installation.
8. Handling of all PDA's *, with or without
accessories must be carried out by personnel
trained in all aspects of manual, mechanical
handling/lifting techniques and standard
safety procedures, in case of doubt, consult
your supervisor and/or safety officer.
9. Yarway do not accept liability for site work
performed under supervision of others.
10. Each PDA* air supply line should be protected
with its own air filter regulator.
11. Please, follow the procedure as detailed
in the IOM**.
12.
warning:
high spring loaded assembly
(use extended bolts for dismantling).
13. The surface temperature as defined
in 2014/34/EC Annex II 2.2.1.2 of the
Desuperheater is a function of the system
it is built into. When installed, the surface
temperature cannot be controlled by the
manufacturer.
Before installation these instructions must be fully read and understood
!! Read all warning labels fitted to the PDA*
before operation or maintenance !!
Never open, dismantle or modify the assembly
whilst under pressure/temperature or other
hazardous conditions.
Note
pda* = pneumatic diaphragm actuator
iOM** = installation, Operation and Maintenance
Manual
© 2017 emerson. all rights reserved.
emerson.com/FinalControl
VCoSI-03350-eN 18/03
INStallatIoN
1. place the pda* with its yoke flange onto
the bonnet of the desuperheater and fixed
it with the lock nut.
2. assemble the 2 half-couplings (upper and
lower) through the screws.
3. installation may be in vertical or horizontal
piping (use support in case of heavy weight).
4. for installation of the positioner and
the air filter regulator, following the
manufacturer's recommendations.
5. connect the lever of the positioner to the
stem coupling (mechanical linkage) and
adjust, if necessary, set points for air filter
regulator, and valve positioner, following
the manufacturer's recommendations.
6. connection of electrical supplies and/or
air piping should be in accordance with
the manufacturer's instruction manual.
7. When satisfactory coordination between
signals and temperature are attained,
adjustment of the set-point can be made
and the system transferred to automatic
operation.
8. ensure easy access of the operating
mechanism (actuator, positioner,
handwheel, etc.) if applicable.
CateGorY
pda's* are manufactured in accordance with
2014/68/ec - category i - gas group 2.
pressure/temperature limits are indicated:
# on the pda* nameplate
