Submittal Sheet

Honeywell
MP516A UNIT VENTILATOR
DAMPER OPERATOR
GENERAL
DESCRIPTION
The MP516A is a sturdy, compact, rolling diaphragm
pneumatic damper operator.
APPLICATION
Primarily, the MP5 16A controls dampers in sequence
with heating and/or cooling valves, or electric heat for
single pressure unit ventilator control systems with an
electrical fan interlock. This operator is adaptable to
many individual unit ventilator systems, and is field
adjustable to perform according to standard cycles of
operation.
SPECIFICATIONS
OPERATING RANGE:
Model with Hesitation Feature:
Minimum OA range: Factory set for 25 percent
(Series 2) or 33 percent (Series 1) minimum
stroke at 3
lb/in
2
(21 kPa). Field adjustable 0
to 100 percent.
Hesitation range: 3 to 8
lb/in
2
(21 to 55 kPa).
Maximum OA range: 8 to 12 lb/in
2
(55 to 83 kPa).
Model without Hesitation Feature: Full stroke 4
to 8
lb/in
2
(28 to 55 kPa) or 5 to 12 lb/in
2
(34
to 83 kPa).
DAMPER LOAD RATING: 2.7 ft
2
(.25 m
2
).
MAXIMUM SAFE AIR PRESSURE: 25 lb/in
2
(172 kPa).
AMBIENT TEMPERATURE: -20 F (-29 C) minimum,
160 F (71 C) maximum.
STROKE:
2-l/8 in. (54 mm) maximum, 2-l/2 in. (64
mm) maximum.
OPERATION
MP516A WITH HESITATION
Changes in air pressure on the diaphragm and cup
(Fig. 1) position the lever arm through its full travel. An
increase in air pressure to 3
lb/in
2
(21 kPa) moves the
lever arm against tension of the main spring to a preset
percentage of total travel. This factory-set percentage is
25 percent on Series 2 models, 33 percent on Series 1
models (Fig. 2). At 8
lb/in
2
(55 kPa) pressure, the lever
arm resumes travel until it reaches 100 percent. At this
point, the supply air pressure force is in balance with the
hesitation spring force.Motion of the lever arm is
returned to zero percent by spring load as air pressure
decreases.
Rev. 9-81
Form No 75-1741
Commercial Bldg Group
MLF TAB: II. C. 7,