49
®
Option 11.0 - Relay Output Enable (0 -1)*
Option parameter 11.0 enables the Alarm 2 output for selected indication as listed in Option 11.9.
Option 11.9 - Alarm Output (0 -20)*
This option parameter allows the control to output via volt-free relay contacts, various fault or status
conditions. The relay output may be used for high voltage and/or low voltage (<50v)n signaling. The
relay output will energize if the selected condition is present, therefore if the power to the control
fails, then the output will be off.
Note: The output must not be used for any safety related function.
0
Relay outputs disabled
1
Relay output enabled. The control outputs data as set in Option 11.9 to control the relay.
1
Motor related fault. The output will be on if any servo-motor fault occurs. (Fault 1 to 8 inclusive).
2
Fault causing non-volatile lockout. The output will be on if any fault occurs which forces the control into a non-volatile lockout
condition.
3
External shutdown condition. The output will be on if any digital intput into the control is forcing a shutdown or lockout condi-
tion (for example: low water). The alarm relays will also indicate this condition. Please note since several external signals can
cause a lockout condition, it will only be possible to identify which condition caused the relay to operate by using the Engineer’s
Key Function. (Fault 17 or Limit 42).
4
External alarm condition. The output will be on if any digital input into the control is forcing an alarm condition (for example:
high water). The alarm relays will also indicate this condition. Please note since several external signals can cause a lockout
condition, it will only be possible to identify which condition caused the relay to operate by using the Engineer’s Key Function.
(Limit L43).
5
Flame failure. The output will be on if the flame check is incorrect in either the false flame or flame not detected conditions.
(Fault 9 or 10).
6
Valve proving. The output will be on if any fault related to the value leakage tests occur. (Fault 15).
7
Air pressure. The output will be on if flow checking is incorrect for either flow or no-flow checking for both the secondary air
and if the selected, the primary air sensors. (Faults 11 to 14 inclusive).
8
Burner modulating. The output will be on if the burner is modulating. (Burner status 16).
9
Burner control valve exceeded. The output will be on if the burner will not fire because the temperature or pressure measured
valve exceeds the high control value, option parameter 7.2 or 9.2. (Engineer’s Key 18).
10
Safety limit exceeded. The output will be on if the temperature or pressure safety limit has been exceeded. Please note this limit
is only available when using the NX1030 or NX1040 fail safe sensors. Option parameter 5.6 (Fault 41).
11
Burner at low fire hold. The output will be on if the burner is held at low fire by either the keyboard low fire hold or the warming
limits.
12
Burner in manual control. The output will be on if the burner modulation rate is being controlled manually via ComFire, key-
board or digital input.
13
Burner in PID or tracking modulation control. The output will be on if either the an external “track “modulation signal or the
internal PID control is controlling the burner.
14
Fuel 1 selected. The output will be on if fuel 1 is selected.
15
Fuel 2 selected. The output will be on if fuel 2 is selected.
16
Burner under sequence control. The output will be on if the burner is under sequence control.
17
Burner is selected as lead under sequence control. The output will be on if the burner is under sequence control and is also
selected as the lead burner.
18
Gas pressure. The output will be on if any fault related to the gas pressure occurs. (Fault 16).
20
Modulation rate. The relay is energized when the Modulation Rate equals or exceeds the value set in Option 5.9.
