34
®
INSTALLATION /TESTING
Check-Run Switch
The Check-Run switch is located on the top of the EP Programmer Module 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 (Ll-L2) and the operating control circuit is closed (L1-13),
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 Hi Fire Switch (D-8) is made and the 30
second purge ends, the control will display:
The control 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 sec-
onds, but before 60 seconds, the control will display:
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.
L1
5
6
7
OIL
GAS
R1
R1NC
OIL
GAS
OIL
CENTER OFF SWITCH 3PDT
SHOWN IN OIL POSITION
INTERRUPT
POWER TO F.M.
PV
MV
R1NO
MAIN GAS VALVE
MV
MAIN OIL VALVE
PILOT VALVE
IGNITION
TRANSFORMER
OFF
OFF
CONTROL
INPUT VOLTAGE
GAS
OFF
CHECK PURGE
0:15
D-8 HI LIMIT
CHECK PURGE
0:45
M-D LOW LIMIT
