Ice formation on the infill at low ambient temperatures (below 5°C) should be avoided.
Следует избегать образования льда в резервуаре (избегать замерзания воды?) при низкой температуре окружающей среды (ниже 5°C).

Контекст:

Ice formation on the infill at low ambient temperatures (below 5°C) should be avoided.
Therefore, it is recommended to proceed as follows:
- fully by-pass the cooling tower (note: at low ambient never use a partial by-pass), until hot water temperature increases;
- The cooling tower shall be fed with 90% of nominal flow, minimum,
If cold water temperature stays above the requested design cold water temperature, fans can be started up on low speed first (if double speed motor).

Заранее спасибо

by-pass the cooling tower = перекрыть (пропустить по другому трубопроводу) подачу воды на градирню, а, если захотите закосить под крутого профи напишите : байпасируйте градирню

Maintenance of fill pack

The infill requires no specific maintenance when the circulation water is said to be clean and non-scaling.
Indeed, clogging and scaling creates heavy loads harmful to the structure and the thermal efficiency.
It is then recommended to check the circulating water quality and treat with the advice (if required) of a professional water treatment company.
Operation for the replacement of film type infill
Cross section view of the cooling tower.