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Once terminal 16 is de-energized, the system proceeds to the MTFI period with terminal 7 (main valve
energized). If selected to be on, terminal 5 with the ignitor becomes energized during MTFI in
accordance with the PTFI*MTFI TIMINGS selection. At the conclusion of the MTFI period and as
selected by the PTFI*MTFI TIMINGS selection and terminal 6 as interrupted/intermittent, terminals 5
and 6 assume their respective states.
Notes on operation:
While in AUTO or RUN mode, once the action started by T16 begins, it cannot be reversed by opening
T16. At the conclusion of PTFI, if T16 is open, the control advances through MTFI to AUTO.
If START INPUT (T21) and PILOT HOLD (T16) are both active in AUTO, T16 has priority and revert
to pilot starts.
The user shall contact the burner manufacturer to determine if the pilot assembly is rated
for intermittent operation.
YP148 PROGRAMMER
The YP148 programmer offers burner operation with extended functions like valve
proving for 2 valve systems, low gas pressure check, fuel selection input, and
burner on/off through keypad. The YP148 programmer makes use of inputs on
terminal 16 for fuel selection, terminals 21 for low gas pressure function and
terminal 23 for valve proving function. All terminals line 16 (Fuel Selection), 21
(LGP) and 23 (VPS) are line voltage inputs.
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