Greenheck DGX Installation, Operation And Maintenance Manual page 21

IMPORTANT!
For proper unit function and safety, follow the
start-up procedure in the exact order that it is
presented.
Step 1 Check the Supply Gas Pressure
Check the supply gas pressure and compare it with the unit's nameplate pressure requirements. Adjust the
supply regulator as needed until the supply gas pressure is within the specified range. See figure #40. The
nameplate is located on the outside of the unit on the control panel side.
Minimum and
maximum gas
pressures
Step 2 Check the Optional High and Low Gas Pressure Switches
Check the settings on the high and low gas pressure switches. The high pressure setting is typically 8 inches wc
and the low pressure is setting is typically 3 inches wc. The switches are set at the factory and should not need
adjustment. Adjust the setting only if needed. See the gas train layout diagram in the reference section for the
high and low pressure switch location.
The purpose of the high and low gas pressure switches is to automatically shut down the burner if the
inlet gas pressure is too low for the burner to safely light, or if the manifold pressure is to high for the
Start-Up - Direct Gas
installation procedures and the Blower start-up
MAX BTU/HR
BTU/H MAX
NORMAL MANIFOLD
PRESSURE
PRESSION D'ADMISSION
NORMALE
MIN GAS
PRESSURE
PRESSION DE GAZ
MIN BURNER
PRESSURE DROP
PERTE MIN DE PRESSION
DANS LE BRULEUR
TYPE OF GAS
NATURE DU GAZ
EQUIPPED FOR
SCFM
CONCU POUR
Figure 40. Direct Gas Nameplate
NOTE!
burner to operate properly.
21
IMPORTANT!
This start-up should begin after all of the
have been completed.
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
"W.C.
PERTE MAX DE PRESSION
DANS LE BRULEUR
DESIGN ∆T
∆T NORMALE
AGAINST EXTERNAL STATIC PRESSURE
"W.C.
CONTE PRESSION STATIQUE EXTERIEURE
"W.C.
"W.C.
PSI
F