TM 5-3895-374-24-2
INSTALLING
CONTROL
CAUTION: Electric power must be turned off during installation.
1.
Check the electrical tabs on the bottom of the chassis - if they are bent out of position, reposition
them with your fingers so that they re in line as shown here.
2.
Slide the slots at the bottom of the assembled control over the tabs on the wiring base. Push the
control into position. Insert a screwdriver through the hole in the top of the control and tighten the
retaining screw.
3.
Electric power may now be turned on.
INSTALLATION/TESTING
Check-Run Switch
The Check-Run switch is located on the top of the EP Programmer Module (note photograph) and can
be used to stop the control in its firing sequence at any time except during MTFI. If moved during
the MTFI period, it is non-functional and automatic programming continues. It is designed to aid in
set-up, start-up and check-out of the burner and its associated interlocks.
Following are the modes of operation:
1.
When power is applied to the control (L 1-L2) and the operating control circuit is closed (Ll-13),
the purge period begins and the firing rate motor is sent to the Hi Purge position. If the Check-Run
Switch is moved to the Check position before the He Fire Switch (D-8) is made and the 30 second
purge ends, the control will display the message, CheckD4 Purge 00. The 00 indicated the purge
timing, in seconds, that the control has completed before the switch was moved to Check. The con-
trol will hold in this position indefinitely to allow the operator to make interlock switch and linkage
adjustments. To continue in the cycle, move the Check-Run switch to Run to allow the control to
advance.
2.
If the Check-Run switch is moved to the Check position after the purge period reaches 30 seconds,
but before 60 seconds, the control will display Check M-D Low Purge 00. The 00 indicates the
purge timing in seconds, that the control was completed before the switch has moved to the check
position. The control will hold in this position indefinitely to allow the operator to make interlock
switch and linkage adjustments. To continue the cycle, moving the Check-Run Switch to Run will
allow the control to advance.
3.
After the PTFI period has begun, switching back to the Check position will stop the program in
the PTFI period, allowing for pilot and/or scanner alignment adjustments to be made. The control
will display the message Check PFTI Flame Signal 00 where 00 equals flame signal strength. It
will hold in this position indefinitely as long as the flame signal strength is above the threshold
of 10. If it drops below 10 for thirty consecutive seconds, lockout will occur and the message on
the display will read Flame Fail PFTI.
4.
Switching from run to check during the burner on period will drive the modulator circuit to low
fire (10X closes). This allows for low fire fuel-air adjustments and holding the burner at low fire.
Consult your boiler/burner instructions for low fire hold firing recommendations. The control will
display Check Low Fire Flame Signal 00 with 00 again indicating flame signal strength.
FLAME SAFEGUARD
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