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KAH Operation & Maintenance Guide
Page: 12 of 88
SECTION 2 - START-UP & OPERATION (CONTINUED)
AMS-60 Damper
General
The AMS-60 is an airflow monitoring device which
combines the functions of control damper and airflow
measurement station into one assembly. It is ideally suited
for factory installation in Solution air handling units. The
AMS-60 is tested to AMCA Standard 611-95 and qualifies
to bear the AMCA Ratings Seal for Airflow Measurement
Performance.
Damper Operation
The AMS-60 airflow monitoring damper design incorporates
a low leakage control damper with stationary, vertical air
monitoring blades and air straightening section into one
assembly. The control damper utilized for modulating airflow
is the ultra-low leak Ruskin CD-60 with its standard blade
and jamb seals used for low leakage. Strategically placed
stationary and vertical airflow sensing blades measure the
air stream velocity pressure. Air tubing/piping connections
are provided to connect the sensing blades to an optional
factory-mounted transducer. The transducer converts the
velocity pressure from the sensing blades to an electrical
output signal for the Building Automation System (BAS).
The output signal corresponds directly to flow through the
damper. The BAS compares this signal to the design CFM
setpoint as determined by the particular mode of operation
of the HVAC system. In normal operation, this setpoint
corresponds to the minimum outside air ventilation required
by the system design to meet ASHRAE Standard 62.
Based on the difference between the actual CFM reading
and the desired setpoint, the BAS would send a signal to
the optional, factory-mounted control damper Actuator to
position the damper blades as necessary to ensure that
the actual outside airflow meets the desired level.
FIGURE 8 - DUCTWORK INLET REQUIREMENTS
D
W
H
Mixing Box
FIGURE 9 - DUCTWORK RADIUS
Mixing Box
R
W
No Calibration Required
The AMS-60 airflow monitoring damper is factory
calibrated. Calibration is not required at the jobsite.
Ductwork Inlet Requirements
When connecting the ductwork to a mixing box with an
AMS-60 damper, a minimum of one (1) equivalent duct
diameter of straight duct is required before entering the
AMS-60 damper.
1 Equivalent Duct Diameter = d
If one equivalent duct diameter cannot be achieved during
installation, the rectangular elbow may be substituted with
a radius elbow. The outside radius must have a R/W ratio
of 0.75 or more.
Damper Linkage Arrangements
The AMS-60 mixing box will ship with independent return
air and outside air damper actuators if selected in the MB
or FM segments.
