KMC Controls CEP-4703/4703V Analog Electronic DAT Controller-Actuator

Description and Application

The compact, analog electronic CEP-4703/CEP-4703V is a combination controller-actuator designed to control the DAT (Discharge Air Temperature, also known as LAT or Leaving Air Temperature) primarily in fan coil and unit ventilator applications. It can be configured for heating or cooling.

DAT temperature setpoint is determined by a resistor (purchased separately - see chart) connected to the terminal block. DAT temperature is measured by a remote STE-1401 (or other 10K Type III thermistor sensor). A sensitivity adjustment (potentiometer) determines the speed of response to measured temperature changes away from setpoint.

When the CEP-4703/4703V is connected to power:

1. The actuator drives to the fully closed position (for two minutes). If the Override signal is present (contact closed across two terminals), indicating system On, the actuator waits one more minute and then starts controlling. If the Override signal is absent (contact open), indicating system Off, the actuator waits in the closed position.
2. Whenever the system goes Off, the actuator stores its current position and then drives to the fully closed position.
3. Whenever the system goes On, the actuator returns to its previous (stored) position, waits one minute, and resumes controlling.

Image Description: A hand is shown holding a green KMC Controls CEP-4703 actuator. The actuator features a black cover, a gray adjustment dial, and a green lever. It is connected to a valve.

The CEP-4703V has a bracket with a patent-pending, quick-mounting mechanism for attaching to valve bodies. See the (Quick-Mounting) CEP-4703V Valve Cross-Reference on page 5 for more information.

Image Description: A KMC Controls CEP-4703V actuator is depicted mounted on a VEB-43 Series valve body, utilizing an HPO-5074 Quick-Mount Adapter Kit. The actuator is primarily green and black, while the valve body is brass.

The CEP-4703 mounts directly to 1/4- to 5/8-inch (6 to 16 mm) round shafts or 1/4- to 7/16-inch (6 to 11 mm) square shafts, eliminating the need for expensive and complicated linkages. An HLO-4001 crank arm kit is available for situations where direct mounting is impractical. An HMO-4002 non-rotation bracket, to prevent lateral movement, is included. An HMO-4001 non-rotation "T" bracket is also available for spanning open distances. A gear disengagement button allows for easy manual positioning of the actuator.

Features

• Compact size is suitable for even tight spaces.
• DAT temperature is measured by a remote STE-1401, and setpoint is determined by a resistor (see chart on page 3) connected to terminals.
• Sensitivity adjustment determines the speed of response to a measured change from setpoint.
• Override signal (contact) determines system On/Off.
• Adjustable mechanical end stop and gear disengagement button allow for easy positioning.
• CEP-4703 mounts directly to shafts, eliminating the need for expensive and complicated linkages; a quick-mounting valve body option is available on the CEP-4703V.

Specifications

All dimensions are in inches (mm).

CEP-4703 Dimensions and Terminals

Image Description: Technical drawings show the side and front views of the CEP-4703 actuator. Dimensions are provided in inches and millimeters. A separate diagram illustrates the terminal block on the CEP-4703, indicating connections for Override input (remembers position and closes valve on no call for heat or cool), Cold water LAT sensor or hot water setpoint resistor, Sensitivity adjustment, and Cold water setpoint resistor or hot water LAT sensor. It also shows a removable conduit fitting with a 1/2" NPS threaded hole and a gear disengagement lever.

CEP-4703V Dimensions

Image Description: Technical drawings show the side and front views of the CEP-4703V actuator, with dimensions provided in inches and millimeters. The gear disengagement lever is highlighted.

Wiring Configurations

Configured for Cooling: A wiring diagram shows a 24 VAC power source connected to a contact, an STE-1401 sensor, and a setpoint resistor. These are wired to the actuator terminals labeled COM, OVERRIDE, CW LAT SNSR, HW SET PT, CW SET PT, and HW LAT SNSR. A note indicates "Contact Closed = System On; Open = System Off" and "CW to Close; CCW to Open".

Configured for Heating: A similar wiring diagram is shown for heating configuration, with the STE-1401 sensor and setpoint resistor connections adjusted accordingly. The terminal labels remain the same.

DAT Setpoint Resistor Chart

*1/4 Watt, 1% (purchased separately from local supplier)

Control Sequence

Image Description: A line graph illustrates the control sequence, showing "% On Time" on the Y-axis (ranging from 0 to 100) and "Position" on the X-axis (labeled CLOSE, 1F SP 1F, OPEN). The graph depicts how the "% On-Time Slope" is adjustable via the Sensitivity Adjustment.

• % On-Time Slope Adjustable Via Sensitivity Adjustment:
• Maximum = 30% per °F (faster response but less stable)
• Minimum = 3% per °F (slower response but more stable)
• % On-Time Period = 1 Minute

General Specifications

• Supply Voltage: 24 VAC (±15/+20%), 50/60 Hz, Class 2 only
• Supply Power: 4 VA max.
• Frequency: 50/60 Hz.
• Override Input: Contact across phase side of supply voltage and override terminal.
• Output Torque: 40 in-lb. (4.5 N•m)
• Angular Rotation: 0 to 95°, fully adjustable with mechanical stop.
• Stroke Time: 90 seconds for 90° @ 60 Hz, 108 seconds for 90° @ 50 Hz.
• Rotation Direction: Clockwise to close, counter-clockwise to open.
• Noise Level: < 35 dBA max. at 1 meter.
• Connections: Wire clamp type, 14 to 22 AWG, copper.
• Mounting: Direct to 1/4 to 5/8 inches (6 to 16 mm) round or 1/4 to 7/16 inches (6 to 11 mm) square shaft by adjustable "V" bolt and non-rotational bracket HMO-4002 (supplied) or HMO-4001; minimum recommended shaft length is 1-5/8 inches.
• Material: Flame-retardant plastic, black housing with green cover.
• Weight: 1.0 lb. (0.45 kg.).
• Approvals: SASO pending.
• Environmental Limits:
  • Operating: 32 to 131° F (0 to 55° C)
  • Shipping: -40 to 176° F (-40 to 80° C)
  • Humidity: 5 to 95% RH (non-condensing)
  • Valve Body: See valve body specifications.

Accessories

The following accessories are available:

• DAT setpoint resistor: (see chart on previous page)
• HCO-1151: Weather shield kit
• HLO-4001: Crank arm kit
• HMO-4001: Non-rotation "T" bracket
• HMO-4002: Replacement non-rotation bracket
• STE-1401: Duct temperature sensor (Type III, 10K)

Image Description: An HMO-4002 non-rotation bracket is shown. This bracket is provided with the CEP-4703.

Image Description: An STE-1401 duct sensor is depicted, used for sensing DAT temperature.

Image Description: A diagram illustrates the dimensions and mounting of the HMO-4001 non-rotation "T" bracket, showing it can be used instead to span an open distance. The bracket is 9" (229 mm) long and 3/4" (19 mm) wide.

Image Description: An HCO-1151 enclosure is shown. It consists of a metal mounting plate, plastic cover, non-rotation bracket, plug caps, and screws, designed to protect actuators from inclement weather.

Image Description: A detailed diagram shows the HLO-4001 crank arm kit components and assembly. The kit includes a Crank Arm, two 1/4-28 X 3/4" Cap Screws, two 1/4-28 Hex Nuts, and two VTD-0804 Ball Joints. It is used when direct mounting of a CEP-4703 is impractical. The diagram shows how the crank arm attaches to the actuator and the valve, with mounting holes for #8 screws on the actuator and a 5/16" Dia. Rod (not included) connecting to the valve.

(Quick-Mounting) CEP-4703V Valve Cross-Reference

CEP-4703V controller-actuators feature brackets with a patent-pending, quick-mounting mechanism that attaches directly onto VFB-43...BC and VFB-46...BC series valve bodies. For additional information, refer to the HPO-5074 installation guide and the VEB-43 and VEB-46 series data sheets.

With the HPO-5074 kit, CEP-4703V controller-actuators can be mounted on the following KMC and other valve bodies:

*VFB-4___BC valve bodies come with the HPO-5074 already installed.