Greenheck DGK (468695) - Manual (Page 11)

11
6. Set the Minimum Firing Rate: Disconnect and
isolate one of the wires running to the modulating
valve to send the unit to its minimum firing rate. Set
the minimum firing rate by adjusting the needle valve
as shown in the image below.
After setting the minimum firing rate, reconnect the
wire to the modulating valve.
Adjusting the maximum and minimum fire may
require the inlet air sensor to be initially set higher
than desired in order to start the burner. Once high
and low fire have been set, the inlet air sensor should
be turned down to the desired temperature.
IMPORTANT
The minimum firing rate setting is critical. If the
setting is too high, the unit may not light, too low
and the flame rod may not detect the flame.
IMPORTANT
The proper minimum firing rate setting results in a
small ribbon of continuous flame which covers the
flame rod and runs across the entire burner.
IMPORTANT
Do not allow the disconnected wire to come in
contact with a potential ground, damage to the
amplifier or transformer could result.
Remove one wire to send the
unit to the minimum firing rate
Minimum firing rate adjustment
Modulating Valve
7. Set the Unit’s Discharge Temperature: Set the
discharge temperature that will provide the desired
space temperature.
The Maxitrol Series 14 should be set to the desired
discharge temperature. The temperature selector is
built into the amplifier.
Set the discharge temperature (65ºF typical)
Maxitrol Series 14
Discharge Temperature Control
8. Flame Signal Check: To measure the flame
signal, disconnect the flame sensor wire from
Sense terminal on ignition controller. Connect one
multimeter lead to the flame sensor wire and one to
the Sense terminal (series). Set multimeter range to
micro amps. The flame signal should be between
.15 to .3 micro amps.
Ignition Controller
Terminal
Sense
Model DGK Make-Up Air
®