SAFETY DEVICE TESTING
6-3
6.6.1 REMOTE INTERLOCK
1. Remove the cover from the I/O Box and
locate the REMOTE INTL’K IN terminals.
2. Start the unit in manual mode and fire at
25% to 30% firing rate.
3. If there is a jumper across the REMOTE
INTL’K IN terminals, remove one side of the
jumper. If the interlock is being controlled by
an external device, either open the interlock
via the external device or disconnect one of
the wires leading to the external device.
4. The unit should shut down and display
INTERLOCK OPEN.
5. Once the interlock connection is recon-
nected, the
INTERLOCK OPEN
message
should automatically clear and the unit
should resume running.
6.6.2 DELAYED INTERLOCK
1. Remove the cover from the I/O Box and
locate the DELAYED INTL’K IN terminals.
2. Start the unit in manual mode and fire at a
25% to 30% firing rate.
3. If there is a jumper across the DELAYED
INTL’K IN terminals, remove one side of the
jumper. If the interlock is connected to a
proving switch of an external device,
disconnect one of the wires leading to the
proving switch.
4. The unit should shut down and display
DELAYED INTERLOCK OPEN.
The
FAULT
LED should be flashing.
5. Once the interlock connection is
reconnected, depress the
CLEAR
button.
The unit should start.
6.7 FLAME FAULT TEST
1. Place the
ON/OFF
switch in the
OFF
position.
2. Place the unit in the Manual Mode and set
the firing rate between 25% and 30%.
3. Close the manual gas valve located
between the safety shut-off valve and the
differential regulator (see Fig. 6.3).
Figure 6.3
Manual Gas Shut-Off Valve Location
4. For dual fuel units, place the diverter valve
in the closed position (see Fig. 6.4).
5. Place the
ON/OFF
switch in the
ON
position
to start the unit.
6. The unit should shut down after reaching the
Ignition cycle and display
FLAME LOSS
DURING IGN.
7. Open the valve previously closed in step 3
or 4 and depress the
CLEAR
button.
8. For dual fuel units, place the diverter valve
in the Natural Gas position (see Fig. 6.4).
Summary of Contents for AERCO Benchmark 2.0
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