Principal Technical Features - Honeywell RM7895A Installation Instructions Manual

Test Relay Module
Number Model
5 All
6 All
7 EC785C;
RM7895C,D;
RM7896C,D
8 All
Final All
Mounting RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D Relay Module
1. Mount the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D vertically on the Q7800 Subbase or
mount horizontally with the knife blade terminals
pointing down. When mounted on the Q7800A, the
RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D must be
in an electrical enclosure.
2. When mounting in an electrical enclosure, provide
adequate clearance for servicing, installation and
removal of the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D, KDM, flame amplifier, flame amplifier
signal voltage probes, electrical signal voltage probes
and electrical connections.
a. Allow an additional two inches (51 mm) below the
RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D for
the flame amplifier mounting.
b. Allow an optional three-inch (76 mm) minimum on
both sides of the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D for electrical signal voltage probes.
3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.
IMPORTANT
The RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D
must be installed with a plug-in motion rather than a
hinge action.
4. Mount the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D by aligning the four L-shaped corner
guides and knife blade terminals with the bifurcated
contacts on the wiring subbase and securely tightening
the two screws without deforming the plastic.
RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES
Table 6. Static Checkout.
Test
Jumpers Voltmeter
5-8 — 1. Ignition spark (if ignition
transformer is connected to
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 — 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.
Normal Operation
terminal 8).
(if connected to terminal 8).
of system being tested.
Mounting Other System Components (Fig. 4)
Refer to the applicable specifications for mounting other
system components.

PRINCIPAL TECHNICAL FEATURES

The RM7895 provides all customary flame safeguard
functions as well as significant advancements in safety,
annunciation, and system diagnostics.
Safety Shutdown (Lockout) Occurs if:
1. INITIATE PERIOD
a. Purge card is not installed or removed.
b. Purge card is bad.
c. Configuration jumpers have been changed (after
200 hours)—Fault Code 110.
d. AC line power errors occurred, see Operation.
e. Four minute INITIATE period has been exceeded.
9
If Operation is Abnormal,
Check Items Listed Below
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 5. If using direct spark
ignition, check first stage fuel valve(s)
instead of 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.
66-1090—4