Lochinvar CF-CH(E)-i&s-08, 999 - 750, 399 Connecting To Gas Supply, Gas Piping, Gas Pressure Test

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

CONNECTING TO GAS SUPPLY

Only supply gas type specified on the unit’s rating plate. This unit is orificed for operation up to 2000 feet altitude. If installing above 2000 feet elevation, consult the appliance manufacturer.

INLET PRESSURE: Measure inlet pressure at the inlet pressure tap located upstream of the combination gas valve(s).

See TABLE–I for maximum and minimum inlet pressures. Do not exceed the maximum. Minimum inlet pressure is for the purpose of input adjustment.

Gas Piping

To safely operate this unit, you must properly size the gas supply piping. See TABLES-J, K, & L for piping and fitting requirements. Gas pipe size may be larger than heater connection.

For ease of service, install a union.

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.

NOTE: It is the installer’s responsibility to supply the sediment trap (drip leg).

TABLE-I

Inlet Pressure

	Max.	Min.
Nat. Gas	10.5" w.c.	4.5" w.c.
LP Gas	13" w.c.	8" w.c.

TABLE–H

Inlet P

IMPORTANT: Do not block access to the electrical cover plate when installing the sediment trap. The sediment trap must be a minimum of 12 inches from the appliance.

MANIFOLD PRESSURE: Measure manifold pressure at the pressure tap on the downstream side of the combination gas valves. The gas regulator on the unit’s combination gas valve is adjustable to supply proper manifold pressure for normal operation. See TABLE–M, page 32 for net manifold pressure settings.

If you must adjust regulator pressure, follow the instructions under Gas Manifold Pressure Adjustment, page 31. Do not increase regulator pressure beyond specified pressure setting.

Gas Pressure Test

1.Disconnect unit from the gas supply piping system during any piping system pressure testing greater than 1/2 PSIG (3.5kPa).

2.Isolate the unit from the gas supply piping system by closing a manual shutoff valve during any piping system pressure testing that is equal to or less than 1/2 PSIG (3.5kPa).

3.Test all gas connections for gas leaks before placing unit in operation.

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.

Connecting Gas Piping to Unit

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.

28