RM7838B,C 7800 SERIES RELAY MODULE
66-1094—08 6
Explosion and Electrical Shock Hazards.
Can cause serious injury, death or equipment
damage.
Close all manual fuel shutoff valve(s) before starting
these tests.
Use extreme care while testing the system. Line
voltage is present on most terminal connections when
power is on.
Open the master switch before installing or removing a jumper
on the subbase. Before continuing to the next test, be sure to
remove test jumper(s) used in the previous test. Replace all
limits and interlocks that are not operating properly. Do not
bypass limits and interlocks.
Electrical Hazard.
Can cause equipment damage.
Do not perform a dielectric test with the RM7838B,C
installed. Internal surge protectors break down and
conduct current, causing dielectric test failure and
destruction of the internal lightning and high current
protection.
Equipment Recommended
Voltmeter (1M ohm/volt minimum sensitivity) set on the
0-300 Vac scale and two jumper wires; using No. 14 wire,
insulated, 12 in. (304.8 mm) long with insulated alligator clips
at both ends. An ammeter to test the load current can replace
one of the recommended jumpers in tests verifying the
combustion blower motor, ignition, pilot and main valve
operation.
General Instructions
1. Perform all applicable tests listed in the Static Checkout,
Table 3, in the order listed.
2. Make sure all manual fuel shutoff valve(s) are closed.
3. Perform only those tests designated for the specific
RM7838B,C model being tested.
4. Raise the setpoint of the operating controller to simulate
a call for heat.
5. For each test, open the master switch and install the
jumper wires between the subbase wiring terminals
listed in the Test Jumpers column.
6. Close the master switch before observing operation.
7. Read the voltage between the subbase wiring terminals
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 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. 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).
Explosion Hazard.
Can cause serious injury or death.
Make sure all manual fuel shutoff valves are closed.
Table 3. Static Checkout.
Test
No.
Test
Jumpers Voltmeter Normal Operation
If Operation is Abnormal, Check These
Items
1 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 None 6-L2 Close burner control.
Recirculating exhaust blower fan starts, then
line voltage at terminal 6.
1. Recirculating/exhaust blower fan.
2. Limits.
3. Stop Switch.
4. Burner Control.
5. Recirculating AFS.
2a None 4-20 Line voltage at terminal 20. Preignition Interlock.
2b None
Close
Pilot
Valve
Hold
4-16 Line voltage at terminal 16. Pilot Valve Hold.
NOTE: C1020 does not have Pilot Valve
Hold.
2c None
Close
Manual
Open
Valve
Switch
4-17 Line voltage at terminal 17. Manual Open Valve Switch.
NOTE: C1020 does not have MOV.
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