Greenheck DG / DGX with Direct Spark (464043 IOM) (Pre-2008) - Manual (Page 23)

23
Remove the wire from terminal #4 to
send the unit to maximum fire
Start-Up - Direct Gas
Start-Up
Low fire time delay setting
(75% of maximum)
Remove the wire from the #3 terminal to
send the unit to maximum fire
Maximum discharge
temperature setting
(100°F Typical)
Minimum discharge temperature
setting (50°F Typical)
Low fire time delay
setting
(75% of maximum)
Step 5 Set the Maximum Firing Rate
Monitor the unit’s actual temperature rise by placing a
thermocouple in the unit’s inlet and a second in the
discharge, three duct diameters downstream of the
burner.
Send the unit to maximum fire by disconnecting and
isolating the proper wire on the Maxitrol amplifier
(Terminal #4 for Maxitrol 14, #3 for Maxitrol 44 as
shown in figure below).
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Step 4 Set the Low Fire Time Delay
Set the low fire time delay to 75% of its maximum
setting. See below for the location of the time delay
setting.
WARNING!
Do not set the burner maximum firing rate based
on gas pressure. It should be set based on the
unit’s designed temperature rise shown on the
direct gas label.
“W.C.
F
PSI
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
MIN BTU/HR
BTU/H MIN
MIN GAS PRESSURE
FOR MAX OUTPUT
PRESSION DE GAZ MIN
POUR PUISSANCE MAX
MAX BURNER
PRESSURE DROP
PERTE MAX DE PRESSION
DANS LE BRULEUR
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
Direct Gas Nameplate
NOTE!
The low fire time delay must be set high enough
to provide at least 10 seconds of low fire while
the unit tries to light.
Maxitrol Series 44
(9 terminals)
Maxitrol Series 14
(7 terminals)