Tongzhou refrigerant pump package · Vessel, flow and defrost interfaces
Specify the actual refrigerant circulation and vessel levels; catalogue supply-distance claims do not select a pump.
From Henan Tongzhou · Refrigeration assembly and pump-package evidence
Individual product research · HVACDeck Editorial · Sources checked 2026-10-11
Select the vessel and canned pump against connected evaporator duty
Tongzhou's refrigerant pump package is described as a low-pressure circulating vessel, canned pump and electrical-control assembly with multiple oil-return points. The original photograph shows a horizontal vessel above a framed pump/control assembly; it does not supply dimensions, pump duty or pressure rating. The source discusses pumped refrigerant supply to low-temperature cold-room coils, freezing shelves, rapid freezing, produce precooling and large ice-making applications.
Hot-gas defrost and long-distance supply are described capabilities requiring the actual plant design. The source's approximately 20% cooling-effect improvement against direct expansion lacks inspected test conditions and cannot be used as a selected capacity or energy guarantee. No refrigerant identifier, circulation ratio, vessel volume, pump curve or safe operating level was published. This brief therefore centres on vessel/pump matching, oil management and the external evaporator/defrost circuit, with actual safety and acceptance responsibilities to be resolved on the issued design.
Published parameters and their scope
This is an equipment family; its range does not identify one orderable configuration.
- Family designation
- Refrigerant pump package
Swipe the table, or focus it and use arrow keys, to read the conditions and sources.
| Parameter | Published value | Conditions and evidence |
|---|---|---|
| Source assembly | Low-pressure circulating vessel, canned pump and electrical controls | No selected vessel volume or pump rating published. Source |
| Oil arrangement | Multiple oil-return points | Actual circuit and operating procedure needed. Source |
| Supply/defrost features | Pumped long-distance supply; hot-gas defrost capability | Line calculation and selected valve/control sequence not supplied. Source |
| Comparison claim | About 20% cooling-effect improvement over direct expansion | No inspected baseline or measured energy result. Source |
| Missing selection data | Refrigerant, pump flow/head, levels, circulation ratio and pressure limits | Required before a complete plant selection. Source |
Selection and application review
Issue evaporator and refrigerant conditions
Specify refrigerant, evaporating pressure/temperature, connected evaporator duties and load variation. Request selected circulation ratio and mass/volume flow, vessel arrangement and pump operating point. An application label cannot determine these values.
Include pipe lengths, elevations, fittings and return-line conditions in the hydraulic calculation. Long-distance supply wording is not a permitted universal line length or a guarantee that any pump can overcome the actual pressure losses.
Select vessel levels and pump protection together
Obtain vessel volume, design pressure/material documents, normal/maximum/minimum operating levels and the selected pump's requirements. Request startup, low-level, flow/pressure and shutdown protection logic. The source provides no safe-level number or redundant-pump configuration to adopt.
Define relief, isolation and site safety responsibilities in the issued plant design. A canned-pump or branded-electrical-component statement does not establish complete-system approval. Confirm actual pump access, replacement scope and the response to loss of supply.
Close oil return and hot-gas defrost interfaces
Request the multiple oil-return-point diagram and procedures for inspection/removal/return with the selected refrigerant and compressor system. Agree who provides separators, valves and related controls. No universal oil-management interval or guaranteed oil-free evaporator performance is established.
For hot-gas defrost, obtain valve sequencing, pressure equalisation, drainage and interlocks with the pump and evaporators. Define recovery to normal refrigeration and plant response to relevant faults. A capability statement is not a safe site-specific sequence.
Test the selected package within the whole plant
Require pressure/leak and electrical/control test records for the actual order, then agree site commissioning with connected evaporators. Measure selected flow/duty, vessel-level stability, oil-management behaviour and actual defrost sequence under defined conditions.
The 20% comparison is a supplier statement without inspected test boundaries. Do not turn it into predicted capacity or annual savings. Current price, lead time, selected component brands and independently verified installed results remain unknown.
Calculate circulation
Fix refrigerant, evaporators, line losses and selected flow/head.
Approve vessel and controls
Obtain pressure/material documents, levels, oil return and fault response.
Commission plant interfaces
Witness normal circulation, defrost, recovery and measured duty.
Sources and review scope
Compiled by HVACDeck Editorial. Source review identifies what the publication states; it is not an independent performance test or certification.
- Official Tongzhou refrigerant pump-package pageChecked 2026-10-11 · Full description and original horizontal-vessel/pump assembly photograph reviewed; quantitative selection and comparison test evidence absent.
Editorial method and corrections · Report a detail with this page URL
Turn the evidence into an enquiry
Send the manufacturer your required duty, installation conditions and the unresolved items identified in this brief.