16
£
Oil, Gas, Fault Mute(Reset) Inputs:
These inputs, if not required for the functions shown, can be wired in the same way and used for non-
safety related functions. Refer to Option Parameters 10.0, 10.6 and 10.7.
WARNING: The fault mute (reset/silence) switch must be within sight and sound of the burner.
These inputs should be connected using multi-strand-
overall shielded multi-conductor PVC insulated 22 AWG-
7/30, 300V 80°C (16/0.2mm) wire. Wiring must comply
with all applicable codes, ordinances and regulations and
where required must comply to NEC Class 1 (Line Volt-
age) wiring. Note that these inputs expect dynamic low
voltage (0/5V) signals and must be taken from the MAIN COMMON terminal provided.
Do not
connect these inputs to Line Voltage. PF2 (Fault/Mute) input is not required if NX550 display is
used.
Aux A to Aux E inputs:
These inputs can be used for safety related functions, refer to Option Parameters 10.1 to 10.5.
These inputs should be connected using multi-strand overall
shielded two conductor PVC insulated 22AWG-7/30, 300V
80°C (7/0.2mm) wire. Wiring must comply with all applicable
codes, ordinances and regulations and where required must
comply to NEC Class 1 (Line Voltage) wiring. Note that these
inputs expect dynamic low voltage (0/5V) signals and must be
connected between the relevant terminals provided.
Do not
connect these inputs to Line Voltage.
Flow com output and flow/no flow inputs:
These terminals should be connected to the
appropriate terminals on the burner’s air
pressure switch using multi-strand overall
shielded 3-core PVC insulated
22AWG-7/30, 300V 80°C (7/0.2mm) wire.
Wiring must comply with all applicable
codes, ordinances and regulations and
where required must comply to NEC Class
1 (Line Voltage) wiring. The flow input
(PF9) should be energized when air pres-
sure is present.
If required, a second air pressure switch may be connected using the separate terminals as required.
If the second airflow switch is not required, two digital inputs may be wired using the flow COM
(PF5) as common for each external switch. These two switches may be used for non-safety related
functions, as listed for option parameter 10.8 and 10.9.
A SPDT switch is required for the air proving circuit. Flow and no flow conditions are verified and
lockout will occur in the event of no flow during run sequence, or flow during an off condition.
Under no circumstances should these inputs be connected to Line Voltage.
I/P 1, 2, 3 COM PF 1
I/P 1+ (FAULT/MUTE) PF 2
I/P 2+(GAS) PF 3
I/P 3+ (OIL) PF 4
I/P A - PF 11
I/P A + PF 12
I/P B - PF 13
I/P B + PF 14
I/P C - PF 15
I/P C + PF 16
I/P D - PF 17
I/P D + PF 18
I/P E - PF 19
I/P E + PF 20
FLOW COM PF 8
FLOW PF 9
NO FLOW PF 10
I/P 4, 5 FLOW COM PF 5
I/P 4 (FLOW) PF 6
I/P 5 (NO FLOW) PF 7
AIR PRESSURE
(SWITCH 1)
AIR PRESSURE
(SWITCH 2)
