Greenheck IG / IGX (464104 IOM) (Pre-2009) - Manual (Page 22)

22
Installation - Gas Piping
IMPORTANT!
All gas piping must be installed in accordance with the latest edition of the National Fuel Gas 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!
When leak testing pressures above 14 in. wc
(
1 ⁄
2
psi), close the field installed shutoff valve,
disconnect the furnace and gas train from the
gas supply line and plug the supply line before
testing.
WARNING!
When leak testing pressures equal to or less
than 14 in. wc ( 1 ⁄
2
psi), first close the field-
installed shutoff valve to isolate the unit from
the gas supply line.
NOTE!
Furnaces have a single 3 ⁄
4
inch connection.
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.
IMPORTANT!
All piping should be clean and free of any foreign
material. Foreign material entering the gas train
can cause damage.
“W.C.
“W.C.
“W.C.
F
PSI
“W.C.
“W.C.
MAX BTU/HR
BTU/H MAX
NORMAL MANIFOLD
PRESSURE
PRESSION D’ADMISSION
NORMALE
MIN GAS
PRESSURE
PRESSION DE GAZ
TYPE OF GAS
NATURE DU GAZ
MIN BTU/HR
BTU/H MIN
MIN GAS PRESSURE
FOR MAX OUTPUT
PRESSION DE GAZ MIN
POUR PUISSANCE MAX
MAX GAS
PRESSURE
PRESSION DE GAZ
MAX
DESIGN ∆T
∆T NORMALE
EQUIPPED FOR
CONCU POUR
SCFM “W.C.
EXTERNAL STATIC PRESSURE
PRESSION STATIQUE EXTERIEURE
AGAINST
CONTE
Minimum and
maximum gas
pressures
Minimum gas
pressure for
maximum output
Type of Gas
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.
Step 1 Determine the Supply Gas Requirements
The unit’s nameplate states the requirements for the gas being supplied to the unit.
Installation