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
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 |
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BTU/H MAX |
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NORMAL MANIFOLD |
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PRESSURE |
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PRESSION DÕADMISSION |
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NORMALE |
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MIN GAS |
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PRESSURE |
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PRESSION DE GAZ |
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MIN BURNER |
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PRESSURE DROP |
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PERTE MIN DE PRESSION |
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DANS LE BRULEUR |
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TYPE OF GAS |
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NATURE DU GAZ |
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EQUIPPED FOR |
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CONCU POUR |
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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 | ||
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| EXTERNAL STATIC PRESSURE | |
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| PRESSION STATIQUE EXTERIEURE | |
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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 |
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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
®
