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Mounting Other System Components (Fig. 4); Setup Of Post Purge - Honeywell 7800 Series Installation Instructions Manual

Relay modules
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Test
Relay Module
Number
Model
1
All
2
All
3
All
4
All
5
All
6
All
7
All
8a
RM7897A
8b
RM7897C
9
All
Final
All

Mounting Other System Components (Fig. 4)

Refer to the applicable specifications for mounting other
system components.
Table 6. Static Checkout.
Test
Jumpers Voltmeter
None
5-L2
Line voltage at terminal 5.
None
6-L2
Line voltage at terminal 6.
4-5
7-L2
1. Burner motor (fan or blower)
starts.
2. Line voltage at terminal 7
5-10
1. Ignition spark (if ignition
20-L2
Line voltage at Terminal 20
5-8
1. Ignition spark (if ignition
2. Automatic pilot valve opens
NOTE: Refer to wiring diagram
5-9
Automatic fuel valve(s) open(s). If
using direct spark ignition, check
first stage fuel valve(s) instead of
pilot valve.
5-21
1. Ignition spark (if ignition
2.
NOTE: Refer to wiring diagram
5-21
Automatic second stage main fuel
valve(s) open(s).
5-3
Alarm (if used) turns on.
CAUTION
Equipment Damage Hazard.
Can cause equipment damage.
After completing these tests, open master switch and remove all test jumpers from subbase
terminals. Also remove bypass jumpers, if used, from low fuel pressure limits.
RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES
Normal Operation
within 10 seconds.
transformer is connected to
terminal 10).
transformer is connected to
terminal 8).
(if connected to terminal
8).
of system being tested.
connected to terminal
21).
Automated Pilot Valve
opens (if connected to
terminal 21).
of system being tested.

Setup of Post Purge

An S7800A1142, Keyboard Display Module (KDM), is
required for the setup of the RM7897 Post Purge Timing, and
must be purchased separately.
When the RM7897A,C is installed and powered, "STANDBY"
will be shown on the first line of the display (Fig. 5).
9
If Operation is Abnormal,
Check Items Listed Below
1. Master switch.
2. Power connected to master switch.
3. Overload protection (fuse, circuit breaker,
etc.) has not opened power line.
1. Limits.
2. Burner controller.
1. Burner motor circuit.
a. Manual switch of burner motor.
b. Burner motor power supply, overload
protection and starter.
c. Burner motor.
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
Preignition Interlocks.
1. Watch for spark or listen for buzz.
2. Listen for click or feel head of valve for
activation.
a. Actuator if used.
b. Pilot valve.
Same as test 6. If using direct spark
ignition, check first stage fuel valve(s)
instead of pilot valve.
1. Watch for spark or listen for buzz.
2. Listen for click or feel head of valve for
activation.
a. Actuator if used.
b. Pilot valve.
1. Listen for and observe operation of
second stage main fuel valve(s) and
actuator(s).
2. Valve(s) and actuator(s).
1. Alarm.
66-1151

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Rm7897a1002Rm7897c1000