Gas Piping - Greenheck DGX Installation, Operation And Maintenance Manual

Installation of 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
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
When leak testing pressures that are equal to 14 in. wg
(3.5 kPa), first close the field-installed shutoff valve to
isolate the unit from the gas supply line.
WARNING
When leak testing pressures that are above 14 in.
wg (3.5 kPa), close the field installed shutoff valve,
disconnect the furnace and gas train from the gas
supply line and plug the supply line before testing.
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.
8 DGX Industrial Space Heating
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.
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
Type of gas
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 manufacturer.
Gas Cock
From
Gas
Supply
1/8 in. Plugged Tap
Supply Gas Line
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 DROP
PSI
PERTE MAX DE PRESSION
DANS LE BRULEUR
DESIGN ΔT
F
ΔT NORMALE
EXTERNAL STATIC PRESSURE
" W.C.
PRESSION STATIQUE EXTERIEURE
Maximum gas pressure
To
Controls
Ground Joint Union
6 in. Trap
®