Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 13)

Start-Up - Direct Gas
S - 5
Remove the wire from
the #3 terminal to send
the unit to maximum fire
Maximum discharge
temperature setting
(140°F Typical)
Minimum discharge
temperature setting
(50°F Typical)
Low fire time delay
setting
(75% of maximum)
Step 6 Set the Maximum Firing Rate
Monitor the units actual temperature rise by placing a
thermocouple in the unit’s inlet and a second in the
discharge, downstream of the burner.
Send the unit to maximum fire by disconnecting and
isolating the proper wire on the Maxitrol amplifier
(Terminal #3 for Maxitrol 44 as shown in figure #20).
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Step 5 Set the Low Fire Time Delay
Set the low fire time delay to 75% of its maximum
setting. See figure #20.
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
Figure 19. Direct Gas Nameplate
Figure 20.
Maxitrol Series 44