7
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Dipswitch 6 provides the option to require that the 3-P, D-8, and M-D interlock circuits be proven
closed and open at the appropriate times.
1. If this option is enabled (switch 6 is up) the 3-P Running Interlock circuit must be proven open
at the start of the operating cycle (when the L1-13 circuit first closes). If the 3-P circuit is closed
at the start of the operating cycle, the blower motor will not energize (terminal M), and the con-
trol will “Hold” for one (1) minute waiting for the 3-P circuit to open. If, after one minute, the 3-
P circuit does not open, the control will lockout. If, within one minute the 3-P circuit does open,
the blower motor will energize (terminal M), and the control will wait up to ten (10) seconds for
the 3-P circuit to be proven closed.
2. If this option is enabled (switch 6 is up), the D-8 High-Fire Purge interlock circuit must be
proven open at the start of purge before the Flame-Monitor™ will drive the firing rate motor to
the high-fire position, (at which time the switch must then be proven closed). If the D-8 inter-
lock circuit is closed at the start of the purge period, the control will “Hold” for ten (10) seconds,
then lockout.
3. If this option is enabled (switch 6 is up), the M-D Low-Fire-Start interlock circuit must be
proven open at the end of high-fire purge before the Flame-Monitor will drive the firing rate
motor to the low-fire position, (at which time the switch must then be proven closed). If the M-
D interlock circuit is closed at the end of the high-fire purge period, the control will “Hold” for
ten (10) seconds, then lockout.
Note: If a particular installation does not have operational switches in all three circuits listed
above, (such as an installation where there is no High-Fire -Purge switch installed, and a perma-
nent jumper is wired between terminals D-8), dipswitch 6 should not be enabled.
*
The EP160, EP161, EP165, EP166, EP170 programmers are shipped with this option disabled (switch 6 is down).
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