Honeywell RM7838B Series, Manual, Page: 34 / 56

65-0120—1 34
11. Ensure 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)
RM7838B
STATIC CHECKOUT
TABLE 7—STATIC CHECKOUT
Test Test If Operation Is Abnormal
No. Jumpers Voltmeter Normal Operation Check The Iterms Listed Below
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 powerline.
2 None 6-L2 Close burner control. Recirculating/ 1. Recirculating/exhaust blower fan.
exhaust blower fan starts, then line 2. Limits.
voltage at terminal 6. 3. Stop Switch.
4. Burner control.
5. Recirculating AFS.
3 None 21 - L2 With test 2 still running, press 1. Start Switch.
Start Switch. 120 Vac will be 2. Preignition Interlock.
present at terminal 21.
4 None 6-L2 Push and hold Stop button. 1. Stop Switch.
No voltage present at terminal 6.
5 4 - 3 None Alarm (if used) turns on. 1. Alarm.
2. Alarm Silencing Switch.
6 4 - 5 7 - L2 Close Burner Control. Recircu- 1. Combustion air fan circuit.
lating/exhaust blower fan starts, a. Manual switch on air fan motor.
then line voltage at terminal 6 . b. Air fan power supply, overload
1. Combustion air fan starts. protection, and starter.
2. Line voltage at terminal 7 2. Combustion Blower Air Flow Switch.
within 10 seconds. 3. Alarm Silencing Switch.
4. Recirculating Air Flow Switch.
7 4 - 8 None 1. Automatic pilot valve opens. 1. Listen for click or feel head of valve
2. First stage valve for activation.
(DSI applicationonly). 2. Watch for spark or listen for buzz.
3. Ignition spark (if ignition a. Ignition electrodes are clean.
transformer connected). b. Ignition transformer is okay.
8 4 - 9 None Automatic main fuel valve(s) 1. Listen for and observe operation of the
opens. (DSI check optional main fuel valve(s) and actuator(s).
second stage fuel valve.)
9 4 - 10 None Ignition Spark (if ignition 1. Watch for spark or listen for buzz.
transformer connected to 10). a. Ignition electrodes are clean.
b. Ignition transformer is okay.
10 12 - 13 18 - L2 Firing rate motor drives open; 1. Low Fire Start Switch.
zero volts at terminal 18 after 2. Firing rate motor and transformer.
motor leaves low fire postion.
11 12 - 13 19 - L2 Firing rate motor reaches high 1. High Purge Rate Switch.
purge rate position; 120 Vac at 2. Firing rate motor and transformer
terminal 19 when High Purge Rate
Switch closes.
12 13 - 14 19 - L2 Firing rate motor leaves high 1. High Purge Rate Switch.
purge rate position; zero Vac at 2. Firing rate motor and transformer.
terminal 19 when High Purge Rate
Switch opens.
13 13 - 14 18 - L2 Firing rate motor drives to low 1. Low Purge Rate Switch.
purge rate position; 120 Vac at 2. Firing rate motor and transformer.
terminal 18 when switch closes.
14 13 - 15 None Adjust firing rate control and 1. Firing rate control.
watch tracking action of the 2. Firing rate motor and transformer.
firing rate motor.
FINAL ALL
CAUTION
Upon completing these test, open the master switch and remove all test jumpers from the
subbase terminal. Also remove bypass jumpers from the low fuel pressure limits (if used).