TechNet-21 - Forum

This forum provides a place for members to ask questions, share experiences, coordinate activities, and discuss recent developments in immunization.

Discussions tagged Repair and maintenance

UNICEF/WHO guidance on Decommissioning and safe disposal of CCE now available in ARABIC and RUSSIAN

Dear TechNet-21 community, Further to the publication of the English and French versions of the Decommissioning and safe disposal of cold chain equipment guidance earlier this year (available here, we are glad to share with you that the Arabic and Russian versions of the document are now available in the TechNet-21 Resource Library. To access these documents, please click on the following li...

Powering Auxiliary Loads in SDD Systems – Energy Harvesting: Is It the Best Alternative?

One of the beneficial features of SDD refrigerators is its relative simplicity. Electrically two wires from the solar array are directly connected to the compressor. This simplicity minimizes problems in the field and simplifies repairs. Energy harvesting technology introduces a great deal of electronic complexity and the complexity increases as a larger percent of the available energy is harvested. In the US the primary mode of failure of new refrigerators is the electronic circuitry. In the...

Invitation for best practices sharing: Cold Chain Equipment Decommissioning and Disposal

Dear TechNet community members, Warm greetings! The cold chain situation in many countries is sub-optimal and affects the capacity of national immunization programs to deliver potent vaccines to all women and children.To help improve this situation, the Gavi Board approved the Cold Chain Equipment Platform Optimization Platform (CCEOP) in 2015 with the purpose to support the purchase of CCE. Since 2016, CCEOP WHO pre-reviews and GAVI Independent Review Committee (IRC) revealed countri...

Looking for templates of Cold chain equipment repair & maintenance record, spare parts record.

Dear colleagues, I am looking for a template of cold chain equipment repair & maintenance record, a template of CCE spare parts record etc which can be used as specimen in training materials on CCE repair and maintenance in the immunization programme. Links, reference documents etc will be highly appreciated. Thank you for your cooperation....

Measurement of Condensation

We are working with ILRs. While daily operations, it was found that there is formation of water droplets inside the device. We want to measure the amount of condensation taking place inside the device in a day. We also tried to calculate the Dew Point Temperature but not much useful. Kindly suggest some method or way to measure the condensation. Regards Akhil...

Two collections of WHO equipment maintenance resources (user and technician)

Thanks to the flexibility of the TechNet-21 website, I can share two older (circa 1985) collections of densely technical and highly practical equipment maintenance documents developed by WHO using the TechNet Resource Library (TRL). Once only available in hardcopy or in a digital corner of the online PATH Vaccine Resource Library, these materials are now available in two TRL collections:

System design: Repair or Replace

A new policy paper on the vaccine supply chain, "System Design: Repair or Replace," has recently been released. It's attached and can also be found here: This paper considers the broader concept of system design and how all components of a supply chain...

Standard Operating Procedure for Fridge Maintenance

Dear All,

I am a project coordinator for Nexleaf Analytics. We are a nonprofit organization dedicated to building low-cost technologies that create positive health, environmental and social impact. I have attached a Standard Operating Procedure (SOP) for fridge maintenance for your review. Additionally, I have also a little bit of the background about why we have created this SOP.

Nexleaf Analytics is currently deploying ColdTrace, our low-cost remote temperature m...

Leveraging fridge holdover time to allow for repair before temperature excursion

We think of fridge holdover time (autonomy) in the context of power shortage, whether cloudy weather in the case of solar, or power cuts for A/C systems.

While this will see functioning equipment through power shortages and keep vaccine 'safe' for a given duration (a parameter which varies immensely in function of the technology chosen) if there is an actual failure in the system, we're losing out on the opportunity to notify users of the failure so that technicians can arrive on...

Remote Production of Distilled Battery Water

In solar powered vaccine storage systems high quality wet cell batteries have the potential of lasting longer than sealed batteries. However, they periodically need the addition of distilled water. Distilled water can be hard to obtain in remote areas.

Sun Frost has developed a method using waste heat from the condenser or compressor to distill small quantities of water needed to make up for water loss in batteries.

If there is sufficient interest and support we coul...

Compressor Replacement Without a Vacuum Pump

Compressor Replacement Without a Vacuum Pump

Replacement of a compressor requires the use of a vacuum pump. Solar
powered vaccine refrigerators are generally located away from the
utility grid. Most vacuum pumps are powered by AC grid power making
compressor replacement difficult. We have developed a method of
removing the air from a system without the use of a vacuum pump. The
method requires the installation of an access valve on the high and ...

Target service life for vaccine refrigerators

What service life do you think vaccine refrigerators should be able to provide? For example, some products may suggest a 10 year life while others suggest longer, with typical repairs. PQS requires a 2 year warranty for a vaccine fridge.
Solar powered vaccine fridge systems require solar electric modules (minimum 20 year warranty is typical and 20 year is required by PQS). Most also have batteries (5 year warranty per PQS)....
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