Ariston PH640MT NG Spezifikationen PDF herunterladen (Seite 18)

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Installation instructions

B The minimum internal diameter required for

any appliance connector is ¾”.

B Undersized flexible appliance connectors not

permitted.

B National Fuel Gas Code requires that a sediment

trap (drip leg) be installed on gas appliances not so

equipped. The drip leg must be accessible and not

subject to freezing conditions. Install in accordance

with the recommendations of the serving gas sup-

plier, see Fig. 25.

Fig. 25 Gas connection (drip leg)

Once connections are made, check for gas leaks at all

joints. Apply some gas leak detection solution to all gas

fittings. Bubbles are a sign of a leak. A combustible gas

detector may also be used to detect for leaks.

GAS LINE SIZING

The gas supply piping for a single heater should be

sized for a maximum draw of 199,000 BTUH. Measure

the length of gas supply line and use the tables in

Fig. 27, page 19 or the gas line manufacturer’s sizing

tables to determine the pipe diameter necessary to

accommodate the 199,000 BTU demand of the heater.

If there are more gas appliances on the line, size the gas

line according to the total maximum amount of BTU

input rating for all appliances.

Note: Undersizing the gas line may result in diminished

hot water flow rate and temperature. See chapter 3.12,

page 21 for the procedure to confirm gas pressure.

Proper gas pressure must be confirmed at time of

installation.

Fig. 26

Danger: If you have a leak, shut off the

gas. Tighten appropriate fittings to stop

leak. Turn the gas on and check again

with a gas leak detection solution.

Never test for gas leaks using a match

or flame.

Gas supply

Cap

Minimum

3”

Gas piping

Inlet gas particle screen

(included)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 55 56

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