18
Terminal #5 is energized 3 seconds after the flame is detected.
Selectable Recycle/Non-Recycle operation on loss of flame after flame is proven.
Igniter remains on for 6 seconds after main valve opened.
Intermittent pilot only.
For interrupted pilot, use MEP536
Pilot Stabilization timing begins as soon as flame is proven.
Selectable Recycle/Non-Recycle operation on loss of flame after Terminal 5 is energized.
Selectable air flow (interlock circuit) proven at start.
MEP500 SERIES
Refer to typical wiring arrangement illustrated on page 40.
The MEP500 Series Programmers provide an additional relay used to control Terminal 4 separately.
This allows the implementation of a pilot stabilization period as well as main trial for ignition period.
They also come equipped with a bank of dipswitches that allow the user selectable prepurge timing,
selectable PTFI timing, selectable post purge, selectable air flow proven open at start, and selectable
recycle/non-recycle operation. Refer to PROGRAMMER DIPSWITCH SETTINGS for detailed
information.
A “run-check” switch is also provided to assist in testing size, position and stabilization of pilot in
conjunction with the flame detector,
TYPE MEP236
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
SELECTABLE PTFI
5 OR10 SEC
SELECTABLE
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
SELECTABLE
POST PURGE
PILOT
IGNITER
MAIN VALVE
MFSP*
6 SEC
*MAIN FLAME STABILIZATION PERIOD
INTERLOCK
AIR FLOW
PROVEN
TYPE MEP230H
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
SELECTABLE PTFI
5 OR10 SEC
SELECTABLE
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
SELECTABLE
POST PURGE
STABILIZATION PERIOD
8 SEC
INTERLOCK
AIR FLOW
PROVEN
