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).
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