Carrier’s Water-to-Water (W2W) Open controller is an integrated component of a Carrier water-to-water source heat pump. The W2W Open controller continuously monitors and regulates heat pump operation with reliability and precision. This advanced controller features a sophisticated, factory-engineered control program that provides optimum performance and energy efficiency. For added flexibility, the W2W Open controller is capable of stand-alone operation. It can also be integrated with any Building Automation System using the BACnet®, Modbus®, LonWorks®*, or N2 protocol.
*Requires LON Option Card (p/n LON-OC)
Product Integrated Controller
| BACnet Support | Advanced Application Controller (B-AAC), as defined in BACnet 135-2001 Annex L |
| Communication Ports |
Network Comm port: EIA-485 port for BACnet MS/TP, Modbus RTU, or N2 communications (protocol and baud rate are DIP switch selectable); Comm Option port: For connecting a LON Option Card (p/n LON-OC); Local Access port: For system start-up and troubleshooting (115.2 kbps); Rnet port: For connecting a T1 temperature sensor. |
| Inputs |
5 analog inputs: Leaving Load Water Temperature, Entering Load Water Temperature (optional), Leaving Source Water Temperature, Outdoor Air Temperature (optional) and Relative Humidity (optional). All AI’s have 10 bit A/D resolution. 5 binary inputs: Compressor 1 Status, Compressor 2 Status, Compressor 3 Status, Remote Occupancy Contact, and Safety Shutdown. |
| Outputs | 8 binary outputs:Stage 1 through Stage 4 Capacity Control, Reversing Valve, Source Water Pump/ Isolation Valve, Load Water Pump, and Alarm Lamp. Relay contacts rated at 3A max @ 24VAC, configured normally open |
| Real Time Clock | Battery-backed real time clock keeps track of time in event of power failure |
| Battery | 10-year Lithium CR2032 battery provides a minimum of 10,000 hours of trend data & time retention during power outages |
| Protection | Incoming power and network connections are protected by non-replaceable internal solid-state polyswitches that reset themselves when the condition that causes a fault returns to normal. The power, network, input, and output connections are also protected against voltage transient and surge events. |
| Status Indicators | LED status indicators for network communications, run status, error, power, and all digital outputs |
| Controller Addressing | Rotary dip switches set BACnet MS/TP, Modbus, or N2 address of controller |
| Listed by | UL-873, FCC Part 15-Subpart B-Class A, CE EN50082-1997 |
| Environmental Operating Range |
Operating: -40 to 158ºF (-40 to 70ºC) 10 to 95% RH, non-condensing Storage: -40 to 158ºF (-40 to 70ºC) 10 to 95% RH, non-condensing |
| Power Requirements | 24VAC +/- 10%, 50-60Hz, 14 VA power consumption, 26VDC (25V min, 30V max), single class 2 source only, 100 VA or less |
