4000-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
98 of 154
1. Timed pre-purge
This must be a separate purge from the rest of
the system. The trial for ignition must be
delayed by 7 seconds while the blower in the
unit is running. This is to guarantee that there
are no combustible gases or vapors present in
the air stream during burner ignition and light
off.
2. Trial for ignition
The length of time must be fixed at 10 seconds.
This is to prevent the ignition module from con-
tinuing activating the spark electrode if a haz-
ardous malfunction takes place.
3. Non recycle
This feature prevents the flame safeguard con-
trol from trying to re-light the burner if it should
fail during the ignition cycle or firing cycle.
Instead it goes directly to a lockout condition
and the flame safeguard will need to be manu-
ally reset.
The M4RT1 has a series of 8 jumpers that are used
to configure the Purge timing, Pilot Trial for Ignition
(PTFI) timing, and recycle or non-recycle operation.
See Page 98, Figure 70.
Purge Timin
g
•Jumpers JP1 through JP5 are used to select the
purge timing for the M4RT1. The available purge
timing selections are 5, 7, 30, 60, and 240
seconds and any additive combination of those
times. Selecting two or more purge timing
jumpers will result in a purge time period equal to
the sum of the jumpers selected. Selection of a
purge time is accomplished by cutting or not
installing the associated jumper. The factory set,
default purge time of 5 seconds (JP1 not installed)
is always selected.
See Page 98, Table 33
lists all
available purge times and how to select those by
cutting jumpers JP2 through JP5.
FIGURE 70: Jumper Locations
Table 33: Jumper Settings
Purge Time (seconds) JP2 JPS JP4 JP5
5 Installed Installed Installed Installed
12 Cut Installed Installed Installed
35 Installed Cut Installed Installed
42 CutCut Installed Installed
65 Installed Installed Cut Installed
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