Honeywell 7800 Series Installation Instructions Manual page 9

Test Test
No. Jumpers Voltmeter
1 None 4-L2
2 None 6-L2
2a None 4-20
2b None 4-16
Close
Pilot
Valve
Hold
2c None 4-17
Close
Manual
Open
Valve
Switch
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)
Table 3. Static Checkout.
Normal Operation
Line voltage at terminal 4.
Close burner control.
Recirculating exhaust blower fan starts, then
line voltage at terminal 6.
Line voltage at terminal 20.
Line voltage at terminal 16.
Line voltage at terminal 17.
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.
9
RM7838B,C 7800 SERIES RELAY MODULE
If Operation is Abnormal, Check These
Items
1. Master Switch.
2. Power Connected to the Master
Switch.
3. Overload protection (fuse, circuit
breaker, etc) has not opened the
power line.
1. Recirculating/exhaust blower fan.
2. Limits.
3. Stop Switch.
4. Burner Control.
5. Recirculating AFS.
Preignition Interlock.
Pilot Valve Hold.
NOTE: RM7838C1020/RM7838C2020
does not have Pilot Valve Hold.
Manual Open Valve Switch.
NOTE: RM7838C1020/RM7838C2020
does not have MOV.
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-
tion, and starter.
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.
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