Daikin / McQuay 860-654873B Microprocessor Control Board (MCB1)
The Daikin/McQuay 860-654873B is a microprocessor control board (MCB1) designed for HVAC systems. It provides precise control and monitoring of system operations, ensuring efficient and reliable performance. This control board is essential for maintaining optimal environmental conditions.
- Model
- Daikin / McQuay 860-654873B
- Calibration
- Available on request
- Price
- $850
- Status
- In stock
- RFQ ref
- 860-654873B
This unit
The Daikin/McQuay 860-654873B is a microprocessor control board (MCB1) engineered for remote monitoring and centralized command of up to eight MicroTech-equipped rooftop and self-contained air conditioning units. This PC board computer manages duct static pressure control, temperature distribution, and multi-unit coordination across networked HVAC systems while maintaining independent schedule assignment and alarm oversight.
Technical Specifications
Part Number: 860-654873B (variants: 860-654873B-11, 860-654873B-06)
Manufacturer: Daikin / McQuay
Product Type: Microprocessor Control Board (MCB1) / PC Board Computer / Chiller Control Board
Power Input: 18 Vac center-tapped from transformer T2
Internal Power Distribution: 12 Vdc to LED Status Board; 5 Vdc to Keypad/Display backlight
Fusing: Two 2 amp fuses in MCB power supply circuit
User Interface: 12-key keypad with 2-line × 16-character alphanumeric display
Communication Ports: Dual ports (A and B) with six terminals each; RS-232C and RS-485 data transmission standards supported; AMP connectors
Network Capacity: Up to 8 MicroTech-equipped units; 2–8 unit groups for common duct static pressure and temperature control
Scheduling: Four independently assignable schedules per unit or unit combination
Network Configuration: Stand-alone operation or integration with MicroTech Network Master Panel (NMP); IBM-compatible PC with MicroTech Monitor software compatible for full-screen monitoring; optional modem support for remote telephone-line access
Key Features
Coordinates communications between RMC controller and unit controllers
Emulates remote unit keypad/display via special keystroke combination
Two hex switches for RMC network address assignment
Microprocessor status LEDs (red, green, amber) indicate operational state
Provides common control temperature distribution across multiple units
Manages temperature monitoring via space or return air sensors
Typical Applications Multi-unit HVAC installations requiring centralized monitoring, networked unit control, and coordinated temperature and pressure management across rooftop and self-contained air conditioning systems.
Compatibility & Integration Works with MicroTech-equipped Daikin and McQuay applied rooftop and self-contained air conditioning units. Integrates with MicroTech Network Master Panel infrastructure and PC-based monitoring via standard RS-232C/RS-485 interfaces.
Specifications
| Parameter | Value |
|---|---|
| Voltage / Current Range | 18 Vac input |
Daikin / McQuay 860-654873B — Repair & Calibration Service
Aumictech offers NIST-traceable calibration and repair for the Daikin / McQuay 860-654873B. Calibration covers I/O channel accuracy per specification, analog output and input calibration to rated accuracy, and functional communication interface test (serial, Ethernet, fieldbus). All calibrations ship with a NIST-traceable certificate. Turnaround is typically 1–3 business days after receipt.
Common Daikin / McQuay 860-654873B faults: blown I/O fuses, failed analog modules, power supply capacitor failure. Common faults include blown I/O protection fuses, failed analog I/O modules, power supply capacitor failure, and serial or Ethernet communication port damage.
Daikin / McQuay 860-654873B price
This Daikin / McQuay 860-654873B is listed at $850. Calibration is available separately from $450. Contact us for volume pricing or if you need multiple units.
Daikin / McQuay 860-654873B calibration cost
NIST-traceable calibration for the Daikin / McQuay 860-654873B is $450 (standard — pass/fail certificate and calibration sticker) or $650 (full measured data at every test point, reference standards documented, traceability chain included). Calibration for this instrument covers I/O channel accuracy per specification, analog output and input calibration to rated accuracy, and functional communication interface test (serial, Ethernet, fieldbus). Turnaround is 1 to 3 business days after receipt. See full calibration details →
