1 Year Warranty
Description
Overview
Essential details：MP904A5047 HONEYWELL Pneumatic Damper Operators
Product Description
General
The MP904A & B PneumaticDamper Operators position damperblades controlling the volume of airflowing through a particular portion ofa heating,cooling, or ventilating system.These damper operators are airpressure actuated by a proportional ortwo-position pneumatic control device
Features
Rolling diaphragm operatedUniversal mounting bracket permitsinternal installation on HoneywellModuflow* dampers or externalinstallation on all makes of dampersprovided with an extension shaft tothe outside of the duct.
MP904A5047
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MP904A5047 HONEYWELL Pneumatic Damper Operators
MODELS
MP904A: Standard operator with pasi
tioner.
MP904B: Standard operator without
positioner.
MAXIMUM SAFE AIR PRESSURE
25 1b/in2 (172 kPa).
START POINT PRESSURE
MP904A: Relay adjustable from 3 to 10
1b/in2 (20 to 70 kPa)
MP904B: Factory set at 2, 3 or 7 lb/in2
(15,20 or 50 kPa).
DAMPER LOAD RATING (See Tables 1
and 2)
Damper load ratings for Honeywell’sModuflow dampers are figured by total.ing the “B” dimensions of all dampersections.(The”A” dimension is paralleland the “B”dimension is perpendicularto the blade length)EXAMPLE:
A duct with an “A” dimension of 108inches (2743 mm) and a”B” dimensionof 36 inches (914 mm) uses three 36.
inch (914 mm) D640 damper sectionsfor the”A dimension,each having a”B”dimension of 36 inches (914 mm)Total the “B” dimension of all threesections: 3 x 36 = 108 in.(3 x 914 =2743 mm). Table 2 shows one MP904Boperator is adequate for modulatingservice， or twoposition service，with aspring range of either 3 to 13 or 7 to 13lb/in2 (21 to 90 or 48 to 90 kPa).Twomotors are required for a 2 to 7 [b/in(14 to 48 kPa) spring range.
MP904A: Standard operator with pasi
tioner.
MP904B: Standard operator without
positioner.
MAXIMUM SAFE AIR PRESSURE
25 1b/in2 (172 kPa).
START POINT PRESSURE
MP904A: Relay adjustable from 3 to 10
1b/in2 (20 to 70 kPa)
MP904B: Factory set at 2, 3 or 7 lb/in2
(15,20 or 50 kPa).
DAMPER LOAD RATING (See Tables 1
and 2)
Damper load ratings for Honeywell’sModuflow dampers are figured by total.ing the “B” dimensions of all dampersections.(The”A” dimension is paralleland the “B”dimension is perpendicularto the blade length)EXAMPLE:
A duct with an “A” dimension of 108inches (2743 mm) and a”B” dimensionof 36 inches (914 mm) uses three 36.
inch (914 mm) D640 damper sectionsfor the”A dimension,each having a”B”dimension of 36 inches (914 mm)Total the “B” dimension of all threesections: 3 x 36 = 108 in.(3 x 914 =2743 mm). Table 2 shows one MP904Boperator is adequate for modulatingservice， or twoposition service，with aspring range of either 3 to 13 or 7 to 13lb/in2 (21 to 90 or 48 to 90 kPa).Twomotors are required for a 2 to 7 [b/in(14 to 48 kPa) spring range.
