CB780E/CB784E RELAY MODULES WITH VALVE PROVING
750-234
25
32-00150—03
3.
Perform only those tests designated for the specific
CB780E or CB784E model being tested.
4.
Raise the setpoint of the operating controller to sim-
ulate a call for heat.
5.
For each test, open the master switch and install the
jumper wire(s) between the subbase wiring termi-
nals listed in the Test Jumpers column.
6.
Close the master switch before observing operation.
7.
Read the voltage between the subbase wiring termi-
nals listed in the Voltmeter column.
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 tech-
niques. Replace all damaged or incorrectly sized
wires.
10.
Replace faulty controllers, limits, interlocks, actua-
tors, valves, transformers, motors and other devices
as required.
11.
Make sure normal operation is obtained for each
required test before continuing the checkout.
12.
After completing each test, be sure to remove the
test jumper(s).
WARNING
Explosion Hazard.
Can cause serious injury or death.
Make sure all manual fuel shutoff valves are closed
before performing static checkout.
Table 8. Static Checkout.
Test
No.
CB780E/CB7
84E Models
Test
Jumpers Voltmeter
Normal Operation
If Operation is Abnormal,
Check the Items Listed Below
1
All
None
4-L2
Line voltage at Terminal 4.
1.
Master Switch.
2.
Power connected to the Master
Switch.
3.
Overload protection (fuse, circuit
breaker, etc.) has not opened the
power line.
2
All
6-L2
17-L2
Line voltage at Terminal 6.
For VP applications. (Terminal
17)
1.
Limits.
2.
Burner Controller.
3
All
16-L2
Line voltage at 16
Valve Proving switch.
4
All
20-L2
Line voltage at Terminal 20.
1.
Pre-Ignition interlocks.
5
All
4-5
7-L2
1.
Burner motor (fan or
blower) starts.
2.
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.
2.
Running or Lockout Interlocks
(including Airflow Switch).
6
All
4-10 *
—
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.
7
All
4-8 *
—
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.
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.
8
All
4-21 *
—
Same as test no. 6 for
connections to Terminal 8. If
using direct spark ignition, check
the first stage fuel valve(s)
instead of the pilot valve or MV2
for VP tests.
Same as test no. 6. If using direct spark
ignition, check the first stage fuel
valve(s) instead of the pilot valve.
