Honeywell RM7838B Installation Instructions Manual page 7

Test Test
No. Jumpers Voltmeter
3 None 21-L2
4 None 6-L2
5 4-3 None
6 4-5 7-L2
7 4-8 None
8 4-9 None
9 4-10 None
10 12-13 18-L2
11 12-13 19-L2
12 13-14 19-L2
(13-15 for
C1020)
13 13-14 18-L2
(13-15 for
C1020)
14 13-15 None
(13-14 for
C1020)
Final
CAUTION
Electrical Hazard.
Can cause equipment damage.
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 3. Static Checkout. (Continued)
Normal Operation
With test 2 still running, press Start Switch. 120
Vac is present at terminal 21.
Push and hold Stop Switch. No voltage present
at terminal 6.
Alarm (if used) turns on.
Close burner control. Recirculating/exhaust
blower fan starts, then line voltage is present at
terminal 6.
1. Combustion air fan starts.
2. Line voltage at terminal 7 within 10 seconds.
Automatic pilot valve opens. First stage valve
(DSI application only).
Ignition spark (if ignition transformer
connected).
Automatic main fuel valves open. (DSI checks
optional second state fuel valve.)
Ignition spark (if ignition transformer connected
to terminal 10.
Firing rate motor drives open; zero volts at
terminal 18 after motor leaves Low Fire position.
Firing rate motor reaches High Purge Rate
position; 120 Vac at terminal 19 when High
Purge Rate Switch closes.
Firing rate motor leaves High Purge Rate
Position; zero Vac at terminal 19 when High
Purge Rate Switch opens.
Firing rate motor drives to Low Purge Rate
position; 120 Vac at terminal 18 when switch
closes.
Adjust firing rate control and watch tracking
action of the firing rate motor.
RM7838B,C 7800 SERIES RELAY MODULE
If Operation is Abnormal, Check These
1. Start Switch.
2. Preignition Interlock.
Stop Switch.
1. Alarm.
2. Alarm Silencing Switch (B model only).
1. Combustion air fan circuit:
a. Manual switch on air fan motor.
b. Air fan power supply, overload protec-
2. Combustion Blower Air Flow Switch.
3. Alarm Silencing Switch (B model only).
4. Recirculating Air Flow Switch.
1. Listen for click or feel head of valve for
activation.
2. Watch for spark or listen for buzz:
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
Listen for and observe operation of the main
fuel valve(s) and actuator(s).
1. Watch for spark or listen for buzz:
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
1. Low Fire Start Switch.
2. Firing rate motor and transformer.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
1. Low Purge Rate Switch.
2. Firing rate motor and transformer.
1. Firing rate control.
2. Firing rate motor and transformer.
7
Items
tion, and starter.
66-1094—08