Chiller and Compressor Overhaul

Semi-hermetic reciprocating and screw compressors can be overhauled depending on the condition of the housing and main components. Hermetic scroll and reciprocating compressors are replaced because of their housing construction. The final decision is made after reviewing model details and completing a technical inspection.

Yes. Overhaul is carried out independently of the installed brand. Scope is determined according to the availability of overhaul parts for the compressor model.

Damage to compressor bearings, shafts, rotors, pistons, windings and lubrication components cannot be fully seen from outside. Initial inspection establishes a preliminary scope. The final parts and work list is determined after opening the compressor and measuring its internal components, then submitted for approval.

This depends on damage extent, compressor type, parts costs, new compressor lead time and expected service life. Replacement is more suitable if overhaul costs exceed 60–70% of a new compressor's price or if the main housing and motor are severely damaged.

Yes. The warranty period is set between 3 months and 1 year according to equipment age, overall condition and overhaul scope. The period and coverage are stated in writing in the overhaul quotation. Warranty covers renewed components and completed labour; correcting system-related conditions such as liquid return, circuit contamination or electrical faults is a warranty requirement.

It generally takes 1–3 weeks depending on scope. A reciprocating compressor requiring only valve plate, seal and oil circuit renewal takes approximately 1 week, while screw compressors needing bearing, rotor or winding renewal and models with long parts lead times can take 3 weeks. The confirmed duration is provided with the final scope after dismantling. If production must continue during overhaul, a rental chiller option is planned. Rental service

If liquid return, lubrication problems, circuit contamination, high discharge temperature, frequent cycling or electrical faults persist, the overhauled compressor can be damaged again. The connected system is therefore checked together with the compressor.

Yes. Moisture, acid and contaminants remain in the circuit after burnout. Depending on damage severity, work includes filter drier replacement, circuit cleaning, oil acid testing and an additional suction cleanup filter. The filter is checked again after the first 24–72 hours and the oil after 2–4 weeks.

In addition to the manufacturer's operating-hour interval, oil changes are determined from colour, odour, moisture and acid test results. If burnout or moisture is suspected, oil is changed without waiting for the interval. When the acid number exceeds 0.05 mg KOH/g, both the oil and filter drier are renewed.

Yes. Old controls that are difficult to diagnose or lack available spare parts are renewed using a suitable microcontroller or PLC system. Operating sequences, alarm codes, sensor inputs and safety functions are configured according to the unit's design.

Workshop testing depends on the available test infrastructure and attainable heat load. Functional, leak and electrical checks are performed in the workshop. Actual capacity and process performance are verified on site with suitable water flow and heat load.

Cleaning dirty heat exchangers, renewing inefficient fans and pumps, updating controls and correcting operating parameters reduce consumption. However, post-overhaul energy performance is not the same as that of a new-generation unit. Investment and operating costs are compared before making a decision.