Honeywell C7400 Manual page 2

SOLID STATE ECONOMIZER SYSTEM
M7415 and M8405 Damper Actuators are 25 lb-in. spring
return damper actuators that provide modulating or three-
position control of economizer systems on HVAC equipment.
• M7415 Damper Actuator provides modulating control
of economizer dampers from a thermistor mixed-air or
discharge sensor to maintain 56°F (13°C) air
temperature.
• M8405A Damper Actuator provides three-position
control: closed, adjustable mid-position, and open.
• W7459 logic modules may plug directly onto the
M7415.
• High impact, glass-fiber reinforced, plastic case is
rugged, lightweight and corrosion resistant.
M7215 Damper Motors provide 25 lb-in. torque with spring
return and 2–10 Vdc modulating control of economizer sys-
tems on HVAC equipment.
• M7215 Damper Motors provide modulating control of
economizer dampers from a 2–10 Vdc controller.
• W7212 logic module may plug directly onto the M7215.
T6031H Thermostat acts as changeover thermostat.
• Switches enclosed to resist effects of dust and
moisture.
• Warmer–Cooler temperature scale.
• Sensing bulb installed in return air flow.
W7459A,C Solid State Economizer Logic Module used with
C7400A Solid State Enthalpy Sensors and M7415 or M8405
Damper Actuators to proportion outdoor and return air damp-
ers for economizer control in commercial HVAC equipment.
• Combine functions of solid state enthalpy changeover
control, minimum damper position potentiometer
(W7459A) and compressor staging relays.
• Optional differential enthalpy control provides greater
economizer savings than single enthalpy control by
selecting the most economical air for cooling.
• W7459A mounts on M7415 Damper Actuator and
accepts inputs from C7150B Mixed Air Sensors,
C7400A Solid State Enthalpy Sensors, C7046C
Discharge Air Sensor, and optional remote minimum
damper position potentiometer.
• W7459C mounts on M8405A Damper Actuator and
accepts inputs from single pole single throw (spst)
mixed or discharge air control and C7400A Solid State
Enthalpy Sensors.
• Packages are designed to operate from the cooling
space thermostat to provide a totally integrated control
system.
• Enthalpy setpoint (A,B,C,D) located on W7459 Solid
State Economizer Logic Module is used to select
combination of air temperature and humidity that is
suitable for free cooling.
63-2484—03
• W7459A include built-in adjustable minimum damper
position potentiometer that controls the amount of
outdoor air admitted to meet minimum ventilation
requirements; includes terminals for connecting
optional remote minimum position potentiometer.
• LED on W7459 indicates free cooling is available when
there is a call for cooling from the thermostat.
W7212A economizer logic module used with C7400A
enthalpy sensors (W7212C uses a C7400C enthalpy sensor),
M7215, MS7503, or MS7505 damper actuators and C7232
CO sensors to proportion outdoor and return air dampers
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from economizer and demand control ventilation in commer-
cial HVAC equipment.
• Operates from thermostat and DCV sensor to provide a
totally integrated control system.
• Combines minimum and DCV maximum damper
position potentiometers with compressor staging.
• Solid state enthalpy or dry bulb changeover control.
• Terminals included for switching between Occupied
and Unoccupied operation.
• Maximum economizer savings is achieved with two (2)
C7400 enthalpy sensors, one (1) W7212 economizer
logic module, and one (1) C7232 CO
differential enthalpy changeover and Demand Control
Ventilation (DCV).
• LED indicates when free cooling is available.
• LED indicates when module is in DCV mode.
• LED indicates when exhaust fan contact is closed.
• W7213 is used with heat pump B terminal.
• W7214 is used with heat pump O terminal.
• Models available for default to minimum position or to
closed on freeze protection. Check with your
Honeywell representatives for the specific OS
numbers.
MS7503 or MS7505 Spring Return Direct
Coupled Actuator
The MS7503 and MS7505 Series Spring Return Direct Cou-
pled Actuators (DCA) are control actuators that provide pro-
portioning 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.
• 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.
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sensor using
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