TM 5-3895-374-24-2
EP ADDITIONAL MESSAGES
DIAGNOSTIC MESSAGES
POSSIBLE CAUSE
SOLUTION
-
Voltage on Terminals 5 or 6
-
Check field wiring to
at an improper time
Terminal 5 and 6
-
High Electrical Noise
-
Check for proper ground on
power supply
-
Install noise suppressor on
power supply
-
Re-route scanner wires away
from high voltage wiring
-
Fuel Changeover on Burners
-
Interrupt power when
with Direct Spark Oil
changing fuels
-
Install time delay relay
-
Note write-up on page 15 of
this bulletin
-
Failed Programmer
-
Replace Programmer
-
Worn Chassis
-
Replace Chassis
Scanner signal has been detected during the shutter closed time. This
LOCKOUT CHECK SCANNER can be caused by a faulty UV tube (4-314-1),
faulty scanner (45UV5),
or lack of power to the scanner.
BEFORE INSTALLING THE CONTROL
CAUTION: Ensure that electric power is shut off.
If either a ground or a short circuit is detected, it must be eliminated before the control is plugged into
the wiring base and power turned on.
Test the electrical field wiring for short circuits and grounds. The recommended method requires the
use of an ohmmeter set on its lowest resistance scale.
Note: When using ultra-violet or infra-red scanning, be sure to remove any jumpers on the wiring base
which ground the S2 Terminal.
1.
Touch the meter probes together and calibrate accurately to ensure a reliable test
2.
Disconnect the neutral wire (L2) from the control system at the power source. Clip one meter test
lead to the grounded green terminal on the lower right side of the wiring base and with the other
probe touch each other terminal. At no time should the meters show continuity or read 0 ohms.
3.
Reconnect the neutral wire (L2) at the power source. Remove the lest probe from the grounded
terminal and reconnect it to Terminal L2 in the wiring base. With the other probe, touch each other
terminal. It is normal to obtain a resistance reading on the meter at some terminals during this test
as there are resistive loads (coils, transformers, lamps, etc.) connected whose normal DC resis-
tance may be less than 5 ohms. However, at no time should the test meter read zero ohms.
CAUTION: Restore power for the following test.
1. With Flame-Monitor removed, measure voltage from L2 to all other terminals. Reading should
be
zero on all terminals except L1.
FLAME SAFEGUARD
(page 3 - 1051)
