Honeywell 7800 Series Product Data page 20

7800 SERIES RM7896A,B,C,D RELAY MODULE
4. Raise the set point of the operating controller to
simulate a call for heat.
5. For each test, open the master switch and install the
jumper wire(s) between the subbase wiring terminals
listed in the Test Jumpers column of Table 4.
6. Close the master switch before observing operation.
7. Read the voltage between the subbase wiring terminals
listed in the Voltmeter column of Table 4.
8. If there is no voltage or the operation is abnormal,
check the circuits and external devices as described in
the last column.
Test RM7896 Test
No. Models Jumpers
WARNING
Make sure all manual fuel shutoff valves are closed.
IMPORTANT
Low fuel pressure limits, if used, could be open. Bypass them with jumpers for the remaining Static Test (if required).
1 All None
2 All None
3 All 4-5
4 All 5-10
5 All 5-8
6 All 5-9
7 RM7896C,D 5-21
8 All 5 -3
Final All
65-0193
Table 4. Static checkout.
Voltmeter Normal Operation
5-L2 Line voltage at terminal 5.
6-L2 Line voltage at terminal 6.
7-L2 1. Burner motor (fan or blower)
starts.
2. Line voltage at terminal 7
within 10 seconds.
— Ignition spark (if ignition
transformer is connected to
terminal 10).
— 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 diagram
of system being tested.
— Automatic fuel valve(s) opens. If
using direct spark ignition,
checkthe first stage fuel valve(s)
instead of the pilot valve.
— Automatic delayed main fuel
valve(s) opens.
— Alarm (if used) turns on.
CAUTION
After completing these tests, open the master switch and remove all test jumpers from the
subbase terminals. Also remove bypass jumpers from the low fuel pressure limits (if used).
9. Check all wiring for correct connections, tight terminal
screws, correct wire, and proper wiring techniques.
Replace all damaged or incorrectly sized wires.
10. Replace faulty controllers, limits, interlocks, actuators,
valves, transformers, motors and other devices as
required.
11. Obtain normal operation for each required test before
continuing the checkout.
12. After completing each test, be sure to remove the test
jumper(s).
If Operation Is Abnormal,
Check The Items Listed Below
1. Master switch.
2. Power connected to the master switch.
3. Overload protection (fuse, circuit
breaker) has not opened the power line.
1. Limits.
2. Burner controller.
1. Burner motor circuit.
a. Manual switch of burner motor.
b. Burner motor power supply,
c. Burner motor.
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
2. Listen for click or feel head of valve for
activation.
a. Actuator if used.
b. Pilot valve.
Same as test no. 6. If using direct spark
ignition, check the first stage fuel valve(s)
instead of the pilot valve.
1. Listen for and observe operation of the
delayed main fuel valve(s) and
actuator(s).
2. Valve(s) and actuator(s)
1. Alarm
20
overload protection and starter.