Greenheck DG / DGX with Direct Spark (470652) - Manual (Page 18)

Direct Spark Ignition Make-Up Air 18
®
7. Set the Unit’s Operating Temperature
Set the operating temperature. The operating
temperature setting depends on which Maxitrol
controller is used.
Maxitrol Series 14 - The Maxitrol Series 14 should be
set to the desired discharge temperature mode. Place
dipswitch in the “UP” position for local control and in
the “DOWN” position for remote control. Keep LFST
dipswitch in the “UP” position at all times for 10 second
delay. Fig. A is required for remote control.
Maxitrol Series 44 - The Maxitrol Series 44 should be
set to the desired space temperature. The temperature
selector is a stand-alone dial. The stand-alone dial may
be mounted remotely.
Maxitrol SC25S - The SC25S is an analog signal
converter that will change a 0-10 VDC or a 4-20 mA
control signal provided by an owner-supplied Building
Management System into an output level capable of
driving one or more modulating gas valves.
The SC25S also limits the minimum and maximum
discharge air temperatures. Reference the unit-specific
wiring diagram and Maxitrol data sheets included in the
IOM packet.
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.
Maxitrol Series 44 — 9 terminals
Maximum discharge
temperature setting
(Typical: 100ºF)
Minimum discharge
temperature setting
(Typical: 50ºF)
Low fire time
delay setting
(75% of maximum)
Remove wire attached
to terminal 3 to send unit
into maximum fire
Maxitrol Series 14 — 8 terminals
Set the discharge temp
Typical
65°F
Minimum: Typical: 55°F
Maximum: Typical: 90°F
Fig. A
Low fire
setting
(LFST)
dipswitch
Discharge
temperature
dipswitch
Remove wire attached to terminal 3
to send unit into maximum fire
Series 44 Temperature Setting
(shown as Space Temperature Control)
Set the space temperature
Typical: 70ºF
Ignition Controller
Sense
Terminal
Place a jumper wire
across the T1 and T2
terminals (labeled sensor)
to send the unit into
maximum fire.
Remove the wire on
terminal 3 to send the
unit into minimum fire.