Lochinvar Gas pressure, Gas valve replacement, 6 Inlet Gas Supply Check - Models 151

7 Gas connections (continued)

17.Check burner performance by cycling the system while you observe burner response. The burner should ignite promptly. Flame pattern should be stable. Turn system off and allow burner to cool, then cycle burner again to ensure proper ignition and flame characteristics.

Figure 7-6Inlet Gas Supply Check - Models 151 - 286

LOOSEN THE SET SCREW ONE (1) FULL TURN AND

PLACE THE MANOMETER TUBING OVER THE

PRESSURE TAP

DETAIL

Figure 7-7Inlet Gas Supply Check - Model 400

LOOSEN THE SET SCREW ONE (1) FULL TURN AND

PLACE THE MANOMETER TUBING OVER THE

PRESSURE TAP

DETAIL

Installation & Operation Manual

Figure 7-9Inlet Gas Supply Check - Models 601 - 801

REMOVE THE 1/8” (3 MM) PIPE PLUG ON THE INLET FLANGE TO THE VALVE AND INSTALL A SUITABLE 1/8” (3 MM) FITTING (FIELD SUPPLIED) FOR THE MANOMETER TUBING.

DETAIL

Gas pressure

The gas pressure must remain between 4 inches w.c. (natural), 8 inches w.c. (LP) minimum and 14 inches w.c. (natural and LP) maximum during stand-by (static) mode and while in operating (dynamic) mode. If an in-line regulator is used, it must be a minimum of 10 feet from the Armor water heater. It is very important that the gas line is properly purged by the gas supplier or utility company. Failure to properly purge the lines or improper line sizing, will result in ignition failure.

The problem is especially noticeable in NEW LP installations and also in empty tank situations. This can also occur when a utility company shuts off service to an area to provide maintenance to their lines.

Gas valve replacement

The gas valve MUST NOT be replaced with a conventional gas valve under any circumstances. As an additional safety feature, this gas valve has a flanged connection to the venturi and blower.

Figure 7-8Inlet Gas Supply Check - Model 501

LOOSEN THE SET SCREW ONE (1) FULL TURN AND PLACE THE MANOMETER TUBING OVER THE PRESSURE TAP

DETAIL

￿WARNING

￿WARNING

Failure to follow all precautions could result in fire, explosion, or death!

DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is factory-set for the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field adjustment. Attempting to alter or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

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