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SOLID STATE ECONOMIZER SYSTEM
3 63-2484—2
MS7505 Spring Return Direct Coupled Actuator
The MS7505 Series Spring Return Direct Coupled Actuators
(DCA) are control actuators that provide proportioning control
for valves and dampers. They accept a voltage signal from an
economizer to position a damper or valve at any chosen point
between fully open and fully closed.
• Control for air damper applications with up to 12.5 sq ft
assuming 3.5 in.-lb per sq ft of damper area, velocity
independent.
• Brushless DC submotor with electronic stall protection.
• Patented self-centering shaft adapter.
• Access cover to facilitate connectivity.
• Metal housing with mechanical end limits.
• Field-installable auxiliary switches.
• Spring return direction field-selectable.
• Hub includes position indicator.
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
these units may not exactly match the specifications
listed. Also, these products are tested and calibrated
under closely controlled conditions and some minor
differences in performance can be expected if these
conditions are changed.
Models:
Specifications for each model are listed separately.
C7046 Discharge Air Sensors
Intended for use as a discharge sensor in rooftop applications.
Sensing Element:
Carbon type, thermistor-resistor element.
Performance Characteristics:
Reaction Time Constant with Air Approach Velocity of 8.33 ft/
sec (2.54 m/sec): 60 seconds.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77°F (24°C). Nominal Sen-
sitivity: 70 ohms per degree F (124 ohms per degree C) at
midrange.
Mounting Arrangement:
Integral mounting flange that requires two no. 8 screws (not
provided).
Maximum Ambient Temperature:
250°F (121°C).
Operating Temperature Range:
40°F to 150°F (4°C to 66°C).
Wiring Connections:
6 in. (152 mm) leadwires.
Dimensions:
See Fig. 1.
C7150B Mixed Air Sensor
Used to sense mixed air in rooftop packaged air conditioning
equipment.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77°F (24°C). Nominal Sen-
sitivity: 70 ohms per degree F (124 ohms per degree C) at
midrange.
Maximum Ambient Temperature:
250°F (121°C).
Operating Temperature Range:
-40°F to +110°F (-40°C to +44°C).
Dimensions:
See Fig. 2.
C7400A Solid State Enthalpy Sensor/C7650A Solid
State Temperature Sensor
Senses enthalpy or temperature of outdoor and return air.
Temperature Sensing Element:
Thermistor.
Output Signal:
4 to 20 mA current signal; increases from 4 mA to 20 mA as
enthalpy decreases.
Ambient Operating Temperature Range:
-40°F to +125°F (-40°C to +52°C).
Approval:
Underwriters Laboratories Inc. Flammability Rating: UL94-5V.
Dimensions:
See Fig. 3.
Fig. 1. Approximate dimensions of C7046C Air Temperature Sensor in in. (mm).
9/16
(14)
7/8
(22)
3/4 (19)
1-1/2 (38)
1/2 (13)
DIAMETER
1/4 (6)
DIAMETER
(2)
3/8 (10)
DIAMETER
IMMERSION LENGTH: 8 (203)
M9087