Honeywell 7800 Series Manual page 21

GENERAL INSTRUCTIONS
1. Perform all applicable tests listed in Static Checkout,
Table 5, in the order listed.
2. MAKE SURE THAT ALL MANUAL FUEL SHUT-
OFF VALVE(S) ARE CLOSED.
3. Perform only those tests designated for the specific
RM7895 model being tested.
4. Raise the set point of the operating controller to simu-
late 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.
Test RM7895 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 Tests
(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 RM7895 5-21
C,D
8 All 5 -3
CAUTION
!
Final All
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).
TABLE 4—STATIC CHECKOUT.
Volt-
meter 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.
21
8. If there is no voltage or the operation is abnormal,
check the circuits and external devices as described in the
last column.
9. Check all wiring for correct connections, tight termi-
nal 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 be-
fore 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,
overload protection and starter.
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
RM7895A,B,C,D
OPERATION
65-0086—2