High Altitude Operation; Measuring Gas Pressure - Bosch GWH-635-ES-N Manual

Temperature modulated with electronic ignition

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User manual (36 pages)

Manual (37 pages)

Table Of Contents

Table of Contents

2.11 Gas line sizing

B It is strongly recommended that the Natural Gas pipe

be Black Iron pipe the entire distance from the

outside meter to the inlet of the gas connection. ¾"

Black Iron pipe up to 20 feet (6.1m) and 1" Black Iron

pipe up to 70 feet (21.34m) distances. Flex line is

NOT recommended, but if used, then oversize the

diameter of the flex pipe, keep the length to a

minimum and try to keep the flex line as straight as

possible.

B It is strongly recommended that the LP Gas pipe be

semi-rigid copper or Black Iron pipe from the outside

regulator to the inlet of the gas connection. For semi-

rigid copper piping: 5/8" up to 10 feet (3.05m) and

¾" up to 30 feet (9.14m) distances. For Black Iron

piping: ½" up to 20 feet (6.1m) and ¾" up to 80 feet

(24.38m) distances. Flex line is NOT recommended,

but if used, then oversize the diameter of the flex

pipe, keep the length to a minimum and try to keep

the flex line as straight as possible.

THESE FIGURES ARE FOR GWH-635-

SUPPLY

APPLIANCES IN THE BUILDING MUST

BE INCLUDED IN THE PIPE SIZING.

National Fuel Gas Code requires that a sediment trap

(drip leg) be installed on gas appliances not so

equipped. Also, a manual gas shut off valve must be

installed on the gas supply line within close proximity of

the water heater and be visible from the water heater.

Warning:

The

disconnected from the gas supply

piping system during any pressure

testing of that system at test pressures

equal to or more than 0.5 psig.

The water heater must not be piped with gas supply

pressures in excess of 0.5 psig. If overpressure has

occurred, such as through improper testing of the gas

lines or malfunction of the supply system, the gas valve

must be checked for safe operation.

When connections are made, check for gas leaks at all

joints. Apply some soapy water to all gas fittings. Soap

bubbles are a sign of a leak.

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 soapy solution. Never test for gas

leaks using a match or flame.

2.12 Measuring gas pressure

To measure and verify if adequate gas pressure is being

delivered to the water heater, first run a high hot water

flow rate and operate other gas equipment on the same

6 720 607 072 (16 January)

ONLY,

ALL

OTHER

heater

must

load. Using a manometer, then measure the inlet gas

pressure at the inlet gas pressure test port. See Fig. 23.

Gas pressures lower than 5" W.C. for Natural Gas or

11" W.C. for LPG will result in insufficient degree rise

to the hot water being used. See Gas Connections,

chapter 2.10.

Fig. 23 Gas pressure measuring (left tapping)