Chiltrix CX34 CX35 CX50

Use cases

• Monitor outlet and inlet water temperatures on a live dashboard to verify heat pump performance remotely.
• Create an alert when compressor frequency or input AC current exceeds a predefined threshold for early fault detection.
• Log water flow and temperature data over time to generate seasonal COP estimates for energy reporting.
• Switch the Chiltrix heat pump on or off remotely during commissioning or scheduled maintenance windows.
• Adjust AC cooling and heating target temperatures from the cloud dashboard without an on-site visit.
• Compare ambient air temperature against water temperatures to diagnose defrost cycles or capacity issues.

Installation

1. 1Connect the Modbus RTU wiring (A, B and GND) from the Chiltrix CX34, CX35 or CX50 terminal block to the RS-485 port on your ModbusCloud gateway (MCG or MLP series).
2. 2Verify that the Chiltrix unit is configured for Modbus RTU communication at 9600 baud, 8 data bits, 1 stop bit, no parity, and note the slave address set on the unit.
3. 3Set the matching baud rate and slave address in the ModbusCloud gateway configuration so it matches the Chiltrix settings exactly.
4. 4Import the Chiltrix CX34 CX35 CX50 template from the ModbusCloud template library and assign it to the gateway port connected to the heat pump.
5. 5Power cycle the gateway and confirm that live readings such as outlet water temperature and compressor frequency appear on the ModbusCloud dashboard.

Things to watch for

01

Why do the temperature values look unusually high on the dashboard?

All Chiltrix temperature registers report values in degrees Fahrenheit. If your dashboard expects Celsius, apply a conversion or check the template scaling settings. A reading of 113 F corresponds to 45 C.

02

Can I read status and write setpoints on the same register?

Yes. Registers 140 through 146 are dual-purpose. They return current status when read and accept new setpoints when written. The template handles both operations on these addresses.

03

What baud rate and serial settings should I use?

Configure 9600 baud, 8 data bits, 1 stop bit and no parity on both the Chiltrix unit and the ModbusCloud gateway. Mismatched settings will cause communication timeouts.

04

Does this template work with other Chiltrix models beyond the CX34, CX35 and CX50?

The template is validated for the CX34, CX35 and CX50. Other models with the same Modbus register map may work, but you should verify compatibility against the Chiltrix Modbus documentation before deploying.

Registers (13)

13 read / 4 write

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