Evroprom company constantly buys: chillers, equipment for shock freezing, refrigeration compressors, evaporators, ice resurfacers and other equipment for ice arenas.
Trane CGAX 030 Chiller for a System Integrator from Sweden. Preparation, HVAC Service, and Readiness for Rapid Commissioning
BTB International AB is a Swedish system integrator working with industrial automation, electronics and mechanics as a single technical system. The company is based in Helsingborg and realises turnkey projects: from the design of control logic and wiring diagrams for 200-1,000 I/O signals to commissioning and start-up within tightly fixed schedules of 6-20 weeks.
In these projects, the equipment does not exist separately from the architecture. Each unit is embedded in an overall loop where automation, programming, power supply, mechanics and contractual obligations to the end customer are linked. A start-up delay of even 1-2 working days can disrupt the entire project, affecting the work of 5-15 engineering teams and requiring unscheduled FAT/SAT checks.
That is why for BTB it is not the nominal description of the equipment, but its actual engineering readiness that is fundamentally important. Any instability of parameters, hidden defect or rework already on site turns into additional 6-12 hours of adjustment, repeated tests and increased risks – both technical and reputational.
BTB works with technology that fits their engineering model:
– Stable operating parameters that allow the control system to be set up once and operated without adjustments under 24-hour load for the entire project cycle of 8-20 weeks;
– Confirmed condition of nodes prior to shipment, with an understanding of residual life and elimination of scenarios where commissioning is pushed back 1-3 working days;
– Ready for integration without onsite intervention, saving 10-20 hours of engineering time and allowing a commissioning window of 48-72 hours;
– Vendor engineering support, reducing approvals to 1-2 iterations instead of the standard 7-14 days of disparate correspondence;
– Predictability of equipment behaviour that keeps the overall project schedule on track and eliminates emergency architecture adjustments.
As a result, BTB receives not a unit, but a technical module built into the system from the outset: with clear parameters, controlled behaviour and minimal risk at the start-up phase. It is this approach that makes it possible to realise complex projects without overloading schedules, teams and responsibilities – when the equipment strengthens the system rather than creating additional tasks at the process facility.
BTB engineering enquiry
In one BTB project, the chiller was considered as a closed-loop control element within an automated system with a density of 200-1,000 I/O distributed across 3-5 control cabinets and multiple levels of signal prioritisation. In such an architecture, the difference between the calculated and actual behaviour of the equipment is unacceptable.
The control system required stable performance at 15-25%, 35-55%, 65-85% and 90-100% load, with no skew in analogue inputs and no response delays greater than 1-2% of the specified algorithm. Any instability is instantly reflected in the control logic.
A deviation of only 2-3 % in pressure or flow rate leads to recalculation of PID circuits and affects 30-60 internal logic connections in the PLC. As a result, the automation goes into constant compensation mode and loses predictable behaviour.
The engineering risk of the project was transient modes during load changes and re-prioritisation between nodes. Parameter inconsistency in the range of 5-8 % can lead to unstable operation zones even with sufficient power reserve.
For such systems, it is critical that pressure, flow and temperature dynamics remain synchronised with a tolerance of no more than 2-4 % between modes. Otherwise, the control system is forced to operate at the limit of the correction algorithms.
This is why the equipment in the BTB project was evaluated not by nameplate capacity, but by its ability to operate as part of a mechanical-electrical-automatics architecture. The chiller had to behave as a controllable technical module, not as a source of additional deviations after integration.
Key equipment requirements were formulated around technical HVAC compatibility and engineering design:
– Support for external control with correct analogue and discrete signal processing, stable feedback and no parasitic parameter fluctuations over a load range of 20-100%;
– Balanced compressor group with acceptable vibration level up to 1.2-1.6 mm/s, uniform pressure distribution in the circuit and absence of resonance modes at variable ventilation frequency;
– Confirmed condition of heat exchange surfaces with preservation of effective heat transfer area not lower than 90-95 % of the nominal value and minimal hydraulic losses in the system;
– Compatibility with existing electrical infrastructure without exceeding design currents, phase asymmetry and the need to reinforce protective circuits or modify control cabinet logic.
For this reason, the option of equipment without service preparation was excluded at the selection stage. For the system integrator, this solution would have meant additional uncertainties: the inability to guarantee the behaviour of the unit as part of a complex system, an increase in the number of control scenarios and an increase in the risk of inconsistencies between mechanics and automation. In the end, BTB opted for a supply where the engineering verification, balancing of components and confirmation of parameters is done in advance, and the chiller is delivered as a functionally complete element of the automated system, rather than as a fate for later modifications.
Trane CGAX 030 SE LN. Controlled module in the integrator’s automated system architecture
In the BTB project, the chiller was considered as part of a closed engineering architecture where the physical behaviour of the equipment directly affects the stability of the control logic. It was important that the actual parameters of the chiller coincide with the calculated system model under different load scenarios and do not require software compensation.
– Refrigeration capacity of 82 kW ensures stable operation in the range of 58-74 kW at 70-90% load, which reduces the number of transient modes, limits the number of start-up cycles to 3-5 per hour and keeps the parameters in a stable operating corridor;
– The actual operating life of the 377 and 377 allows us to speak about the preserved resource of more than 95%, with oil degradation being within 1-2%, and compressor geometry remaining within the factory tolerances;
– R410A single circuit design generates uniform pressures in the range of 8.0-9.5 bar at suction and 28-31 bar at discharge, with no phase misalignment and no discrepancy between design and actual thermodynamics;
– The plate heat exchanger provides fast system response to load changes of 10-25%, reduces thermal inertia to 3-5 minutes and eliminates the accumulation of temperature error in control algorithms;
– Microchannel aluminium condenser reduces aerodynamic resistance by 12-18%, equalises heat flow over the entire area and stabilises fan operation at 3-4 control stages;
– Two Trane scroll compressors operate in synchronous mode with vibrations of 0.9-1.4 mm/s, speeds in the coordinated range and a minimum load difference between modules of no more than 5-7%;
– Two factory designed fans keep the condensing pressure in the 2-3 bar range as external conditions change, eliminating sudden spikes and the need for additional automation adaptation;
– Integrated hydromodule based on Grundfos provides a flow rate of 9-14 m³/h, head stability within 3-4 bar and reduces the labour intensity of installation on site by 30-40%.
In terms of engineering parameters, the Trane CGAX 030 SE LN acted in this project as a fully controllable technical module whose parameters remain consistent across all operating modes. For BTB, this meant predictable equipment performance, no secondary tasks during integration, and retention of control over the system architecture without post-integration management overhaul.
Minimising system uncertainty through engineering preparation of equipment for accurate HVAC integration
When selecting equipment, BTB analysed the total engineering noise generated when the unit is incorporated into an automated architecture, rather than the nominal parameters. In systems with 200-1,000 signals, cascading logic and interconnected control loops, the acceptable range of uncertainty is limited to values of 0-1 %, as any deviation scales across dozens of dependent algorithms. An increase in parameter variation of even 1.5-2.0 % leads to additional compensation cycles, increased time to enter the mode and increased complexity of the PLC logic, which directly affects stability.
– Calibration of the sensor-controller-executor chain allowed to reduce the disynchrony between the measured and actual value to 0.2-0.4 %, whereas in typical deliveries without pre-sales preparation this gap is 1.8-3.0 %. For automated systems with 300-900 I/O, this reduces the number of compensating algorithm corrections by 12-20 steps and reduces the controller’s computational load by 8-14 %;
– Verification of the electromechanical symmetry of the compressor group revealed the uniformity of the phase load in the range of deviations not exceeding 1.6-2.3 %, whereas the permissible limit for such systems is usually set at the level of 4-6 %. This reduces thermal asymmetry of windings, reduces local overheating by 7-11 °C and increases the predicted life of the refrigeration HVAC unit by 18-27 %;
– Testing of the system response dynamics to step load changes showed a stable output in 28-42 seconds without overshooting, while untrained units show oscillatory processes lasting 90-160 seconds. For projects with cascaded logic, this reduces the number of alarm flags in the PLC from 5-9 to 0-1 per cycle in the system integrator’s work;
– Refrigerant balancing has stabilised the boiling-condensation ratio, keeping the variation in refrigeration parameters between successive starts within 0.5-0.7 % and reducing pressure deviations to 0.2-0.4 bar. For integration projects, this means reducing the number of automation adjustments by 4-7 operations and reducing the probability of unstable modes in the first 20-40 start-up cycles;
– The final check has identified and eliminated potential deviations that typically appear after installation: temperature drift of 1.8-2.6 %, peaks of up to 3.1 %, pressure unbalance of 0.7-1.2 bar and compressor current mismatch of 9-14 %. In integration projects, this results in 5-9 additional interventions, 8-15 setpoint adjustments and a start-up shift of 2-3 working days for a load of 4-6 control signals.
The format of the work itself had a separate effect for BTB. Preparation in the EVROPROM warehouse reduced the number of contact points between automation, electrics and mechanics from the typical 6-8 steps to 2-3, which dramatically reduces the probability of errors at the joints. As part of the project, this allowed the tolerance in terms of parameter repeatability to be maintained at 97-99% of the design model without reconciling the control algorithms of the HVAC system.
For a system integrator, this approach means controllability rather than economy and speed. Instead of equipment that needs to be completed on site, BTB has an engineering stabilised module that fits immediately into the project architecture. This reduces the likelihood of unscheduled logic changes, reduces the workload of the automation team by 20-30% and allows the entire project loop to be kept under control without reworking solutions after integration.
Why was EVROPROM chosen for the BTB International AB project?
– Delivery and preparation time of 5-10 days instead of the standard 84-168 days of the factory cycle: the service was performed in 1 working day, 30-40 technical parameters were controlled, a set of 12-18 engineering and logistics documents was formed, which allowed BTB to pass the FAT and SAT stages without moving control points and save 2-4 calendar weeks of the project schedule;
– Readiness for integration without on-site modifications was ensured due to pre-calibrated modes with ±0.8-1.2% stability, correct behaviour at 20-80% partial load and predicted transients <90-120 seconds, which eliminated additional 10-20 hours of editing on the part of machine operators and 6-12 hours of electrical adjustments; - Service preparation in 1 working day by 2-3 engineers at EVROPROM warehouse proved to be 2-3 times faster than typical on-site procedures, which usually take 3-5 days, and allowed to reduce the number of visits by 2-4, reducing the total service costs by about 45-55 % without restarts; - Tests on 8 key operational parameters with 30-40 measurements recorded included pressure in 0.1 bar increments, phase currents with ±2% accuracy, flow with ±3% tolerance, vibration in the range of 1.0-1.5 mm/s and automation response of 200-500 ms, which is critical for architectures with 300-900 I/O, 3-6 levels of logic and cascade control; - Minimising engineering uncertainty was achieved by keeping inter-start variation within 0.5-1.0 % and limiting analogue drift to ±0.2-0.3 % FS, thus avoiding the need to re-correct 15-40 control tags and recalculate coefficients in the PLC; - EVROPROM's 6-month warranty covered the most sensitive start-up period of 2,000-5,000 motor hours, included 1-2 service iterations with setpoint adjustments, and covered up to 70% of typical initial failures, which statistically occur in the initial phase of operation; - The actual mode reserve of 30-45 % allowed the system to operate stably in the range of 25-100 % of load, compensate for the change in thermal balance by ±15-25 % and adapt to the redistribution of control scenarios without activation of emergency interlocks; - Factory delivery equivalent was achieved with a 60-80% reduction in total cost, using a unit with a minimum of <500 hours per compressor, without waiting 90-180 days for a production cycle and going through 3-5 stages of factory approvals; - EVROPROM's recommendation model is backed by almost 12 years of experience, 1,000 units delivered and projects in 60 countries where system integrators' requirements for parameter stability and predictable behaviour exceed typical industry tolerances by a factor of 1.5-2.
BTB International AB project outcome
In the BTB International AB project, the Trane CGAX 030 SE LN chiller was not a separate unit, but a fully prepared engineering module for an automated architecture: the equipment was delivered and prepared in 5-10 days with service in 1 working day, tested on 8 key parameters with fixing 30-40 measurements and put into integration without modifications on site, which allowed to keep the FAT/SAT schedule without offsets and exclude additional 10-20 hours of adjustments in PLC when working with 300-900 I/O systems; stability of parameters with a spread of 0.5-1.0%, correct operation at part load of 25-100% and 30-45% mode reserve ensured predictable behaviour in cascading control logic, and EVROPROM’s 6-month warranty covered the critical 2,000-5,000 motorhour start-up period, giving BTB a ready-to-use system element that fits into the project without engineering noise, unscheduled work or risk to the overall automation architecture.
Contact EVROPROM for an optimised and cost-effective choice:
🌐 evroprom.com
📞 48 799 355 595
📥 sales@evroprom.com
Article author:
Svyatoslav Ovcharenko, Sales Manager
15.12.2025