Product Overview

RM7890; RM7895 100 VAC 7800 SERIES RELAY MODULES
19 66-1195—01
Table 11. RM7895 Static Checkout.
a
Use an ammeter in place of the jumper wire to verify current draw of the terminal loads. Do not exceed ratings shown in Tables
2 and 3.
CHECKOUT
WARNING
Explosion Hazard.
Can cause severe injury, death or property
damage.
Do not allow fuel to accumulate in the combustion
chamber. If fuel is allowed to enter the chamber for
longer than a few seconds, an explosive mixture could
result.
Limit the trial for pilot to ten seconds, and limit the attempt to
light the main burner to two seconds from the time the fuel
reaches the burner nozzle. Do not exceed the nominal lightoff
time specified by the equipment manufacturer. Close the
manual fuel shutoff valve(s) if the flame is not burning at the
end of the specified time.
Test Number
Test
Jumpers Voltmeter Normal Operation
If Operation is Abnormal, Check the Items
Listed Below
WARNING
Explosion Hazard.
Can cause severe injury, death or property damage.
Make sure that all manual fuel shutoff valves are closed.
IMPORTANT
Low pressure fuel limits, if used, could be open. Bypass them with jumpers for the remaining static tests, if required.
1 None 5 to L2 Line voltage at terminal 3. 1. Master Switch.
2. Power connected to the Master Switch.
3. Overload protection (fuse, circuit breaker)
has not opened the power line.
2 None 6 to L2 Line voltage at terminal 6. 1. Limits.
2. Burner controller.
3 4 to 5 7 to L2 Burner motor (fan or blower)
starts.
Line voltage at terminal 7 within
10 seconds.
1. Burner motor circuit.
a. Manual switch of burner motor.
b. Burner motor power supply, overload
protection and starter.
c. Burner motor.
4
5 to 10
a
— Ignition spark (if ignition
transformer is connected to
terminal 10).
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
5
5 to 8
a
— 1. Ignition spark (if ignition
transformer is connected to
terminal 8).
2. Automatic pilot valve opens
(if connected to terminal 8).
NOTE: Refer to wiring dia-
gram of system being
tested.
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
2. List for click or feel head of valve for
activation.
a. Actuator, if used.
b. Pilot valve.
6
5 to 9
a
— Automatic fuel valve(s) opens. If
using direct spark ignition, check
the first stage fuel valve(s)
instead of the pilot valve.
Same as test number 5. If using direct spark
ignition, check the first stage fuel valve(s)
instead of the pilot valve.
7 5 to 3 — Alarm, if used, turns on. Alarm.
Final
CAUTION
Equipment Damage Hazard.
Incorrrect wiring can damage equipment.
After completing these tests, open the Master Switch and remove all test jumpers from the subbase
terminals. Also remove the bypass jumpers from the low fuel pressure limits (if used).