EXINDA FLEX 33.5 RT R515B Water-to-Water Scroll Heat Pump Chiller
Heat recovery for hotels, hospitals and plants.
In a building with a chiller plant, the cooling tower throws away heat that the boiler then burns gas to make again. EXINDA FLEX takes that heat from condenser water and delivers hot water up to 185°F, producing chilled water at the same time. 33.5 RT cooling, 53 RT heating, 460 V / 3 Ph / 60 Hz, with up to eight units sequenced.
Core specifications
| Item | Published data |
|---|---|
| System | EXINDA FLEX water-to-water scroll heat pump chiller |
| Functions | Hydronic cooling, heating and hot water up to 185°F |
| Refrigerant | R515B; A1 safety class; GWP 293; 50 lb charge |
| Compressors and circuits | 2 scroll compressors; 2 refrigerant circuits |
| Heat exchangers | Shell-and-tube evaporator and condenser, ASME construction; 316L stainless-steel water side |
| Power | 460 V / 3 Ph / 60 Hz; rated current 52.2 A cooling, 70.9 A heating |
| Water connections | 3 in. condenser; 2.5 in. evaporator, inlet and outlet |
| Net dimensions | 79 × 56.3 × 65 in. (L × W × H) |
| Weight | 2,866 lb machine; 3,042 lb operating |
| Sound pressure | 85 dB(A) at 1 m, free field |
| Certification | CSA certified. AHRI certification in progress. |
Rated cooling, heating and high-temperature performance
| Operating mode | Capacity | Input / efficiency | Water temperatures (EWT / LWT) |
|---|---|---|---|
| Cooling | 33.5 US RT | 29.27 kW; EER 4.01 W/W | Chilled water 54.0 / 44.0°F; condenser water 85.0 / 94.3°F |
| Heating | 53 US RT | 46.51 kW; COP 4.03 W/W | Hot water 120.0 / 140.0°F; source water 76.3 / 65.0°F |
| High-temperature heating | 49.6 US RT | 66.85 kW | Hot water 158.0 / 176.0°F; source water 77.0 / 68.0°F |
Performance data developed in accordance with AHRI 550/590 test procedures.
185°F hot water by source water temperature
Hot water reaches 185°F whenever chilled water leaves the unit at 50°F or above. Warmer source water raises capacity and COP.
| Source water inlet | 185°F hot water | COP | 158°F hot water | COP |
|---|---|---|---|---|
| 104°F | 75.8 RT / 910 MBH | 3.42 | 84.5 RT / 1,014 MBH | 4.82 |
| 95°F | 67.7 RT / 812 MBH | 3.10 | 75.1 RT / 901 MBH | 4.41 |
| 86°F | 60.4 RT / 725 MBH | 2.81 | 66.6 RT / 799 MBH | 4.00 |
| 77°F | 54.0 RT / 648 MBH | 2.54 | 58.9 RT / 707 MBH | 3.61 |
| 68°F | 48.2 RT / 578 MBH | 2.29 | 52.0 RT / 624 MBH | 3.24 |
How this works in a chiller plant: 185°F hot water from condenser water with a heat recovery heat pump.
Hydronics and controls
| Condition | Evaporator side | Condenser side |
|---|---|---|
| Rated cooling | 80.4 GPM | 109.9 GPM |
| Rated heating | 85 GPM | 66.4 GPM |
Control package
PLC control with a 7-inch HMI touchscreen, Modbus RTU/TCP, and BACnet through a gateway. Up to eight units run as one sequenced plant.
Technical Documents and Related Products
Download the technical submittal ↓PDF · Performance tables, operating envelope, electrical data and dimensional drawingsWater-Source Heat Pump Selection Questions
What source water temperature is needed for 185°F hot water?
Chilled water leaving the unit at 50°F or above. From 86°F condenser water, FLEX delivers 60.4 RT (725 MBH) at 185°F with a COP of 2.81.
Can it recover heat from cooling tower condenser water?
Yes. FLEX takes heat from the condenser water loop before it reaches the tower, delivers hot water up to 185°F and returns cooler water to the loop.
Can it replace a boiler that serves existing radiators?
Where radiators and coils are designed for supply water up to 185°F, FLEX can serve them directly. Check emitter output at the selected supply temperature.
What should I send for initial selection?
The hot-water temperature and load, the source water available with its temperature and flow, and whether the cooling output has a use in the building.
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