Almost every Temperzone air conditioning unit contains a unit controller board that lets you get an amazing amount of information via your BMS, if you connect it the right way! You get a huge array of information that is useful in commissioning and you can also monitor performance and easily identify faults. Importantly it’s also the most cost efficient way to connect Temperzone units to a BMS.
The solution is super simple. Any Temperzone air conditioning unit using a UC6, UC7 or UC8 controller board can be connected directly to the BMS interface using shielded pair BMS communication cable. No need for expensive relay boards and even more expensive wiring.
Using BMS relay boards, like the configuration shown below, severely limits the BMS control of the air conditioning unit down to a small number of essentially on / off functions.
The shielded pair daisy chain configuration shown below is simpler, cheaper and faster to install and give vastly improved BMS control.
In the last issue of Temperzone News we ran an article about a glasshouse climate control project in Queensland. It is an unusual and extreme air conditioning project but is essentially enabled by the unit controllers on the OPA ECO units, daisy chained to the BMS, using BMS communication cable.
The glasshouse project simply would not have been possible using conventional BMS relay boards and relay wiring.
As virtually all Temperzone air cooled and water cooled products have UC6,UC7 or UC8 controllers they can be connected to a BMS using this approach. As temperzone split ducted units have an indoor unit controller that is networked to the outdoor unit, the daisy chain can be connected to either unit.
The following are available via the BMS Connection:
- Turn the compressor On / Off
- Read & select the Evap fan speed
- Read & select Cooling / Heating / Fan Only
- Read & Select the Capacity (DiGital / Inverter / Multi Compressor Units Only)
- Read & Select the operating mode (High Efficiency / Dry or Super Dry Mode)
- Monitor Temperatures, Pressures, State of Other Inputs
- Observe unit Safety timers
- Observe the state of Outputs such as CMC Relay, R/V relay etc
- Observe information on reported faults
*This differs between models
The benefits are many, exceptional control (particularly with ECO range products), increased efficiency across the duty cycle, faster commissioning, enhanced fault finding and comprehensive monitoring. Don’t forget it is much faster and cheaper to install.
If you want more information on how to get the best out of BMS connectivity talk to your Temperzone contact.