Lochinvar 402 - 2072 Gas connections, Connecting to gas supply, Gas pressure test, Gas piping

3 Gas connections

Connecting to gas supply

Verify that the appliance is supplied with the type of gas specified on the rating plate. This appliance is configured for operation up to 4,500 feet altitude. Consult factory for installations above 4,500 feet elevation.

Inlet gas pressure: Measured at the inlet pressure tap on the appliance gas manifold. The pressure tap is located upstream of the combination gas valve(s) (FIG. 3-3 on page 33).

See Table 3A for maximum and minimum inlet pressures. Do not exceed the maximum. Minimum inlet pressure is for the purpose of input adjustment.

TABLE 3A

INLET GAS PRESSURE

MODEL	NATURAL			LP
	Max.	Min.	Max.		Min.
	w.c.	w.c.	w.c.		w.c.
402 - 2072	14.0	4.5	14.0		8.0

Manifold pressure: The gas regulator on the unit’s combination gas valve is adjustable to supply proper manifold pressure for normal operation. See the Copper-fin II Service Manual for net manifold pressure settings.

If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment in the Copper-fin II Service Manual. Do not increase regulator pressure beyond specified pressure setting.

Gas pressure test

Installation & Operation Manual

Install a manual main gas shutoff valve, outside of the unit gas connection within six feet of the unit in accordance with the requirements of the National Fuel Gas Code, ANSI Z223.1.

You must provide a sediment trap (drip leg) in the inlet of the gas connection to the unit.

NOTICE	It is the installer’s responsibility to supply
	the sediment trap (drip leg).
	Do not block access to the electrical cover
CAUTION
	plate when installing the sediment trap.
	The sediment trap must be a minimum of
	12 inches from the appliance.

The combination gas valves have an integral vent limiting device and do not require venting to atmosphere, outside the building. The unit will not operate properly if the reference hose is removed or a vent to atmosphere is installed.

Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.

Gas connection

All gas connections must be made with pipe joint compound resistant to the action of liquefied petroleum (L.P.) and natural gases. All piping must comply with local codes and ordinances. Piping installations must comply with approved standards and practices.

1.Make sure gas line is a separate line direct from the meter unless the existing gas line is of sufficient capacity. Verify pipe size with your gas supplier.

1.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

2.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).

3.The appliance and its gas connection must be leak tested before placing it in operation.

COUPLING

UNION

MANUAL MAIN

SHUT OFF

VALVE

USE WRENCH TO HOLD SUPPLY PIPE

12"

MIN

Gas piping

To safely operate this unit, you must properly size the gas supply piping. See Tables 3B through 3D for piping and fitting requirements. Gas pipe size may be larger than heater connection.

For ease of service, install a union.

NIPPLE

CAP

Figure 3-1_Gas Line Connection

If an inline high gas pressure regulator is NOTICE used, it MUST BE of the lockup type and

be located a minimum of 10 feet from the appliance. Failure to do so may result in insufficient gas volume supplied to the appliance.

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