48
£
Auxiliary Input Switch Functions
0
No function or default function as listed above.
1
Auto/manual selection. A high level on the input forces the unit into manual modulation mode.
2
Manual up. A high level on this input will force the unit to modulate up if manual is selected via one of the other auxiliary inputs.
3
Manual down. A high level on this input will force the unit to modulate down if manual is selected via one of the other auxiliary
inputs.
4
Setpoint select. The level of the input determines whether setpoint 1 or setpoint 2 is used. A low level selects setpoint 1. Refer
to option parameters 6.0 and 8.0.
5
Release to ignite. Once the system has purged, the drives will move to their ignition positions. A high level on the input will start
the ignition sequence
6
Release to modulate. Once the burner has ignited and the ignition time has elapsed, the drives will move to their low fire posi-
tions. After the low fire hold time has elapsed, a high level on the input will permit the drives to modulate.
7
Lead boiler select. If boiler sequencing is enabled, a high level on the input selects the unit as the lead boiler.
8
Profile select. The input will select between firing profile 1 or 2 for the selected fuel.
9
Purge Hold. A closed contact will hold the pre-purge (sequence status 8).
10
Oil valve proof of closure. A high level on this input confirms the closure of the main oil valve. This function may only be used in
circumstances where the relevant approvals for the specific application allows a proof of closure switch to be used. Option 2.9
must also be enabled.
11
Gas valve proof of closure. A high level on this input confirms the closure of the main gas valve. This function may only be used
in circumstances where the relevant approvals for the specific application allows a proof of closure switch to be used. Option
2.9 must also be enabled.
12
Trim Enable. A high level on this input will enable oxygen trim.
13
Spare. Input is ignored.
14
Forced lockout. A high level on the input (switch closed) prevents the unit from going into safety shutdown condition (burner
lockout). If the high level is removed, the display will show F17 and the fault relay will operate. (This is the function required by
the extra low water alarm).
15
Forced shutdown. A high level on the input (switch closed) prevents the unit from going into a controlled shutdown condition
(burner off). If the high level is removed, the display will show LIMIT 42 and the limit relay will operate. (This is the function
required by the low water alarm).
16
Forced alarm. A high level on the input (switch closed) prevents the unit from going into a limit condition. If the high level on the
input is removed, the display will show L 43 and the limit relay will operate. (This is the function required by the high water
alarm).
17
Forced Lockout Oil only. This function is only active when firing on oil. A high level on the input (switch closed) prevents the
unit from going into safety shutdown condition (burner lockout). If the high level is removed, the display will show F23 and the
fault relay will operate. (This is the function required by the low oil pressure alarm).
18
Forced Shutdown Oil only. This function is only active when firing on oil. A high level on the input (switch closed) prevents the
unit from going into a controlled safety shutdown condition (burner lockout). If the high level is removed, the display will show
LIMIT 45 and the limit relay will operate. (This is the function required by the low oil temperature alarm).
19
Forced Lockout Gas only. This function is only active when firing on gas. A high level on the input (switch closed) prevents the
unit from going into safety shutdown condition (burner lockout). If the high level is removed, the display will show F22 and the
fault relay will operate. (This is the function required by the low gas pressure alarm).
20
Forced Lockout Gas (during modulation) only. This function is only active when firing on gas and after the unit moves away
from the ignition. A high level on the input (switch closed) prevents the unit from going into safety shutdown condition (burner
lockout). If the high level is removed, the display will show F24 and the fault relay will operate. (This is the function required by
the high gas pressure alarm).
21
Fan Interlock. This function is a normally open contact or switch, that closes after the blower output(PB12) is energized
22
Fuel Pump Interlock. This function is only active when firing on oil. This function is a normally open contact or switch, that
closes after the auxiliary relay output (PB14) is energized (refer to option parameter 1.4 for timing).
23
Purge Hold Off. Configures a second airflow function. The purge timer is not started until this switch is made. For example,
70% purge airflow requirement for NFPA. The input is then ignored after purge.
