Honeywell RM7838B User Manual

RM7838B,C 7800 SERIES RELAY MODULE
7 66-1094—08
3 None 21-L2 With test 2 still running, press Start Switch. 120
Vac is present at terminal 21.
1. Start Switch.
2. Preignition Interlock.
4 None 6-L2 Push and hold Stop Switch. No voltage present
at terminal 6.
Stop Switch.
5 4-3 None Alarm (if used) turns on. 1. Alarm.
2. Alarm Silencing Switch (B model only).
6 4-5 7-L2 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.
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.
7 4-8 None Automatic pilot valve opens. First stage valve
(DSI application only).
Ignition spark (if ignition transformer
connected).
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.
8 4-9 None Automatic main fuel valves open. (DSI checks
optional second state fuel valve.)
Listen for and observe operation of the main
fuel valve(s) and actuator(s).
9 4-10 None Ignition spark (if ignition transformer connected
to terminal 10.
1. Watch for spark or listen for buzz:
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
10 12-13 18-L2 Firing rate motor drives open; zero volts at
terminal 18 after motor leaves Low Fire position.
1. Low Fire Start Switch.
2. Firing rate motor and transformer.
11 12-13 19-L2 Firing rate motor reaches High Purge Rate
position; 120 Vac at terminal 19 when High
Purge Rate Switch closes.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
12 13-14
(13-15 for
C1020)
19-L2 Firing rate motor leaves High Purge Rate
Position; zero Vac at terminal 19 when High
Purge Rate Switch opens.
1. High Purge Rate Switch.
2. Firing rate motor and transformer.
13 13-14
(13-15 for
C1020)
18-L2 Firing rate motor drives to Low Purge Rate
position; 120 Vac at terminal 18 when switch
closes.
1. Low Purge Rate Switch.
2. Firing rate motor and transformer.
14 13-15
(13-14 for
C1020)
None Adjust firing rate control and watch tracking
action of the firing rate motor.
1. Firing rate control.
2. Firing rate motor and transformer.
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)
Test
No.
Test
Jumpers Voltmeter Normal Operation
If Operation is Abnormal, Check These
Items
maxon.su

Honeywell RM7838B Specifications

General

Brand	Honeywell
Model	RM7838B
Category	Computer Hardware
Language	English