Excel R75151A/B, RP7515A/B, R7516B MicroCel Controllers. CSI 3-Part Specifications.

GENERAL

The R7515A/B, RP7515A/B, R7516B MicroCel� Controllers ("MicroCels") are Distributed Digital Controllers (DDC) that can operate on a stand-alone basis or can be networked into the DeltaNet architecture on an RS-485 bus using Honeywell Communications Network Automation Protocol ("C-NAP").  Models are available with a variety of input and output configurations for control of applications with various I/O point requirements.

The MicroCel is field programmable allowing it to be used for various zone control applications, and other types of HVAC equipment. Also, the MicroCel is furnished with prepackaged programs to control both single- and dual-duct Variable Air Volume ("VAV") terminal units. For VAV units, MicroCel models are available with an integral, electric damper actuator and a Honeywell MICRO SWITCH microbridge flow sensor for measurement of very low differential pressure. For dual-duct VAV units, the MicroCel can accommodate a separate, remote, microbridge sensor and control a second damper actuator.

The MicroCel is used in conjunction with an Excel T75 l 5AD M-Cel� Space Temperature Sensor ("Space Sensor") for VAV and other unitary HVAC applications. Where pneumatic output is required, the MicroCel is available with integral electric-pneumatic transducers.

FEATURES

• Low differential flow sensor
• Noise-free control of VAV boxes
• Program and parameter data stored in nonvolatile memory
• Variety of input and output combinations
• Convenient operator terminal connections
• Quick Space Sensor wiring terminations
• Static and brown-out protection
• Easy and quick installation or modification

SPECIFICATIONS
Models:

¹ Provision for connecting remote microbridge sensor for second airflow input.
² Used as remote microbridge sensor. No base unit board assembly. Resistance Temperature Device ("RTD") and digital inputs on remote input board not applicable.
³ Model with high heat dissipation case.

Base Unit Board Assembly:
Eight-bit processor, memory, power supply. Interfaces to:

� Space Sensor (with or without setpoint adjustment, occupied switch/LED)
� Four triac outputs to drive one or two damper actuators
� Input/output boards
� C-NAP bus
� 24V ac power source

¹ Digital output provided by spdt relays or Triac on Board Type F.
² Pneumatic output provided by integral electric-pneumatic transducers.

Ratings:
Inputs:

Resistive: 2910 to 4370 ohms,
�40 to 265F (-40 to 130 C) with platinum sensors
Voltage: 0 to lOV dc with 2V overrange
Digital: External switch, relay, or transistor into 15V dc, 15 mA circuit
Microbridge Sensor: 0 to 2.6 in. wc differential pressure

Outputs:

Analog: 0 to 10V dc, 20 mA maximum
Digital: 30V ac; 7.5A maximum inrush, I.OA maximum running

Pneumatic:
Operating Range: 3 to 15 psi (20 to 105 kPa)
Maximum Safe Air Pressure: 25 psi (172 kPa)
Air Handling Capacity: 0.039 scfm (18 ml/s) at 5kPa
Air Consumption: 0.0017 scfm (0.8 ml/s) maximum
Triac:
30V ac; 7.5A maximum for one
60 Hz cycle, l .OA maximum running, fully isolated

Damper Actuator:

Torque: 35 lb-in.
Travel: 90 degrees
Timing: 90 seconds for full travel
Crankshaft Connection: For 3/8 to l/2 in. (9.5 to 12.7 mm) square or round damper shaft, minimum 2-1/2 in. damper extension required

Memory Size:
EPROM: 64K
EEPROM: 8K standard
RAM: 8K

Enclosure:

Input Power:
20 to 30V ac, 50/60 Hz, 250 mA maximum; 3.9 VA for Type 1 input board model

Communications:
Two-wire RS-485 C-NAP bus

Terminations:
Electric:

Space Sensor Inputs: Ten-line modular wiring connector
Triac Outputs: Screw terminals
Additional 1/0: Screw terminals
RS-485 and 24V ac Power: Four-line jack (or alternate screw terminals)
Microbridge Sensor: Barb type for I/4-in. (6-mm) O.D. plastic tubing
Pneumatic Output:
Main: Barb type for l/4-in. (6-mm) O.D. plastic tubing
Branch: Barb type for 5/32-in. (4-ram) O.D. plastic tubing

Dimensions and Weight:
Metal case with conduit knockouts and ground screw

Mounting:
Without Damper Actuator: On any surface using four (thread-forming) anchoring screws
With Damper Actuator: On VAV terminal box damper axle extension and using four (thread-forming) anchoring screws

Environmental Limits:
Temperature:

Shipping: 40 to 150F (�40 to 65.6C)
Operating: 40 to 122F (4.4 to 50C)

Relative Humidity: 5 to 95% noncondensing

Agency Listings:
Complies with FCC Rules
Underwriters Laboratories (UL) Listed per UL Standard 864, and 916, and plenum rated for air handling compartments.

Accessories:
Input Boards for Field Add-On:

• W7621A Input Board Type 1
• W7621B Input Board Type 2
• W7621C Input Board Type 3

Output Boards for Field Add-On:

• W7622A Output Board Type B
• 14506700-001 Output Board Type D
• 14506700-002 Output Board Type E
• W7622D Output Board Type F
• ML6161B Damper Actuator
• M6410A/B Valve Actuator and V5811 Two-Way, or V5812 ThreeWay Valve
  
  

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