Installation of Direct Gas Piping

important

All gas piping must be installed in accordance with the latest edition of the National Fuel Gas

1.Determine the Supply Gas Requirements

The unit’s direct gas nameplate states the requirements for the gas being supplied to the unit. The direct gas nameplate is located on the outside of the unit on the control center side.

Code ANSI/Z223.1 and any local codes that may apply. In Canada, the equipment shall be installed in accordance with the Installation Code for Gas Burning Appliances and Equipment (CGA B149) and Provincial Regulations for the class. Authorities having jurisdiction should be consulted before installations are made.

warning

All components of this or any other gas-fired heating unit must be leak tested prior to placing the unit into operation. A soap and water solution should be used to perform this test. NEVER test for gas leaks with an open flame.

warning

If pressure testing in excess of 1/2 psig (3.5 kPa), the heater and manual shutoff valve must be disconnected from the supply gas line.

MAX BTU/HR

 

 

BTU/H MAX

 

 

 

 

 

 

 

 

 

 

NORMAL MANIFOLD

 

 

PRESSURE

 

“ W.C.

PRESSION DÕADMISSION

 

 

 

NORMALE

 

 

 

 

 

 

 

 

 

 

MIN GAS

 

 

PRESSURE

 

“ W.C.

PRESSION DE GAZ

 

 

 

 

 

 

 

 

 

 

 

MIN BURNER

 

 

PRESSURE DROP

 

“ W.C.

PERTE MIN DE PRESSION

 

 

 

DANS LE BRULEUR

 

 

 

 

 

 

 

 

 

 

TYPE OF GAS

 

 

NATURE DU GAZ

 

 

 

 

 

 

 

 

 

 

EQUIPPED FOR

 

 

AGAINST

 

 

SCFM

 

CONCU POUR

 

 

CONTE

 

 

 

 

Minimum gas pressure for maximum output

MIN BTU/HR

BTU/H MIN

MIN GAS PRESSURE

FOR MAX OUTPUT“ W.C. PRESSION DE GAZ MIN

POUR PUISSANCE MAX

MAX GAS

PRESSURE“ W.C.

PRESSION DE GAZ MAX

MAX BURNER

PRESSURE DROPPSI PERTE MAX DE PRESSION

DANS LE BRULEUR

DESIGN ∆T

F

∆T NORMALE

 

 

 

 

EXTERNAL STATIC PRESSURE

 

“ W.C.

 

 

PRESSION STATIQUE EXTERIEURE

 

 

warning

If pressure testing at or below 1/2 psig (3.5 kPa), the heater must be isolated from the supply gas line by closing its manual shutoff valve.

important

All piping should be clean and free of any foreign matter. Foreign material entering the gas train can damage the valves, regulators and burner.

important

Do NOT connect the unit to gas types other than what is specified and do NOT connect the unit to gas pressures that are outside of the pressure range shown on the label.

NOTE

When connecting the gas supply, the length of the run must be considered in determining the pipe size to avoid excessive pressure drop. Refer to a Gas Engineer’s Handbook for gas pipe capacities.

Type of gas

 

Maximum gas pressure

 

Direct Gas Nameplate

2. Install Additional Regulator if Required

When the supply gas pressure exceeds the maximum gas pressure shown on the direct gas nameplate, an additional regulator (by others) is required to reduce the pressure. The regulator must have a listed leak limiting device or it must be vented to the outdoors.

NOTE

The regulator located inside the unit is used to adjust the unit’s maximum output temperature.

3. Connect the Supply Gas Line

A manual shut off valve (gas cock), 1/8 in. plugged test port and 6 in. drip leg must be installed prior to the gas train. The valve and the test port must be accessible for the connection of a test gauge. Supply gas connections must be made by a qualified installer and are not furnished by Greenheck.

To

Controls

Gas Cock

Ground Joint Union

From

Gas

Supply

1/8 in. Plugged Tap

6 in. Trap

Supply Gas Line

6Model VSU Make-Up Air

®

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Greenheck Fan VSU Installation of Direct Gas Piping, Determine the Supply Gas Requirements, Connect the Supply Gas Line

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