Commercial Heat Pump Chiller Technical Documentation & Engineering Support
Consulting engineers and contractors rarely pick equipment from a brochure. They need to know whether the unit fits the plant room, what it does at the design condition, how it talks to the building controls, and whether the paperwork will survive a submittal review. This page gathers what EXINDA can send you for that review, and what we need from you to answer properly.
Commercial Heat Pump Chiller Categories
EXINDA FLEX covers three architectures. Which one fits depends on the building's heat source and whether heating and cooling are needed at the same time.
Modular air-cooled heat pump chillers. R32, North American configuration at 208 / 460 / 575 V, 3 Ph, 60 Hz. The 12-ton and 24-ton platforms cascade for capacity and redundancy; eight 24-ton units run as one plant. No cooling tower, no condenser water loop. CSA approved; AHRI certification is in program. See the air-cooled modular range.
Water-to-water heat pump chillers. R515B scroll and screw machines for buildings with a ground loop, a process water source, or a central condenser loop, and for projects that need higher supply temperatures than an air-cooled unit will give. See the water-cooled range.
Four-pipe heat recovery chillers. R454B units producing chilled water and hot water at the same time from one machine, for buildings whose zones fight each other.
Water-to-Water Heat Pump Chiller Applications
Water-to-water suits hydronic heating retrofits where the existing terminals were sized for boiler temperatures. The FLEX 118 kW R515B scroll unit produces hot water to 85 °C, with 118 kW rated cooling, 186 kW rated heating and 175 kW in high-temperature heating, at 380 V / 3 Ph / 50 Hz, designed to EN 14511, ISO 817 and EN 378. A 33.5 RT version is configured for 460 V / 60 Hz projects. Larger loads move to the 337.5 kW water-cooled screw platform.
The usual reason a project lands here is a commercial heating retrofit: radiators or old fan coils stay, the boiler comes out, and the supply temperature has to stay high enough that nobody re-pipes the building. Rated capacity and COP move with entering water temperature, so the numbers above only mean something alongside the conditions in the submittal.
Simultaneous Heating and Cooling with Four-Pipe Heat Recovery
A hotel cooling its south rooms while heating domestic hot water, a hospital cooling imaging rooms year-round, an office with a full-glass west facade — these buildings pay twice when heating and cooling sit in separate plants. A four-pipe machine has independent chilled-water and hot-water circuits and moves the rejected heat from one into the other instead of to ambient.
The FLEX 140 kW R454B four-pipe unit gives 119 kW cooling with 168 kW heating in simultaneous operation, with a combined COP up to 8.2 at the stated conditions. Hot water reaches 60 °C down to −20 °C ambient, and 55 °C between −25 °C and −20 °C. Up to six units cascade. This is the European configuration at 380 V / 3 Ph / 50 Hz.
Four-pipe only pays back where the simultaneous load is real and lasts. If the building's heating and cooling seasons barely overlap, a two-pipe machine plus separate heating is usually the cheaper answer, and we will say so.
BMS Integration
FLEX units carry PLC control with an on-board HMI and communicate with the building management system; multi-unit sequencing runs at the plant level so the BMS sees one plant rather than eight machines. Available protocols, point lists, gateway requirements and alarm mapping differ by platform and by control version, so ask for the controls document for the specific model rather than working from a generic list. If your specification names a protocol or a point schedule, send it with your enquiry and we will confirm against it before quoting.
Engineering Submittal Documents
Per model, on request:
- Rated performance at stated test conditions, with part-load and off-design points
- Electrical data — power supply, full load amps, starting current, breaker and cable sizing
- Dimensional drawings, service clearances, weights and lifting points
- Water-side data: flow rates, pressure drop, minimum system volume, water quality limits
- Installation and commissioning documentation
- Control and BMS integration documents
- Certification and compliance documents applicable to the model and market
Performance is measured in EXINDA's own test stands, built to AHRI test-stand requirements and used for AHRI witness testing: air-cooled from 6 kW to 500 kW in two-, four- and six-pipe configurations, ambient −40 °C to 60 °C and humidity to 95 %; water-cooled to 500 tons (1,758 kW) with leaving water to 100 °C.
Selection Checklist
Send these and we can size the plant rather than guess at it:
- Building type, location and design ambient conditions
- Heating and cooling loads, and whether they occur at the same time
- Required supply and return water temperatures on each circuit
- Available power supply — voltage, phase, frequency
- Heat source: air, ground loop, process water or condenser loop
- Plant room or roof constraints: footprint, access route, structural limits, sound limits
- Refrigerant restrictions, local code or certification requirements
- Controls: BMS protocol and any point schedule already specified
Drawings and a load schedule are welcome but not needed to start. If a requirement above is a hard constraint rather than a preference, say which — it usually decides the machine.
Request a Technical Review
Send your project conditions and we will come back with a model selection, the rated data at your conditions, and the submittal documents for that model. Where a requirement falls outside what a listed model covers, we will tell you that instead of proposing the nearest unit.
Distributors and HVAC brand partners evaluating the FLEX range for a territory can request the commercial product information pack through the same form.