Cointra OPTIMA COB 5 Instrucciones De Instalación, Uso Y Conservación página 69

2.4. Insert a suitable gas stop cock in the gas supply to the water heater.
2.4.1. The joining between this stopcock and the gas entry tube to the water heater included in the
accessories bag must be carried out by brazing.
2.4.2. The gas connection pipes must have the following diameters:
- External ø 12 mm pipe for models COB 5 and COB 5 x.
- External ø 15 mm pipe, for models COB 10, COB 10 x and COB 14
2.5. Water heater water connections.
2.5.1. To make installation easier or replace previous models, the water heaters have been equipped
with flexible hoses.
2.5.2. Connect the flexible hoses according to the following directions:
- Female-Female flexible hose is used to connect the cold water inlet with the water heater inlet.
- Male-Female flexible hose is used to connect the hot water inlet with the water mains.
2.5.3. All connections shown are carried out with R 1/2" screw.
2.5.4. Make sure the joints are tightened properly.
G
H
Cold Hot
C H
C
Gas
G
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