7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
10
WARNING
This equipment generates, uses, and can radiate
radio frequency energy, and if not installed and used
in accordance with the instructions Manual, may
cause interference with radio communication. It has
been tested and found to comply with the limits for a
Class A computing device pursuant to Subpart J of
Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when
operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause
interference, in which case, users at their own
expense will be required to take whatever measures
may be required to correct the interference. Any
unauthorized modification of this equipment may
result in the revocation of the owner’s authority to
continue its operation.
Humidity
Install the 7885A where the relative humidity never reaches
the saturation point. The 7885A is designed to operate in a
maximum 85% RH continuous, noncondensing moisture
environment. Condensing moisture may cause a safety
shutdown.
Vibration
Do not install the 7885A where it could be subjected to
excessive vibration, 0.5G continuous maximum.
MICROCOMPUTER
RESET
PUSH-
BUTTON
STATUS LEDs
SAFETY RELAY
CIRCUIT
POWER SUPPLY
OPTIONAL KEYBOARD
DISPLAY MODULE
PLUG-IN
FLAME
AMPLIFIER
RELAY
DRIVE
CIRCUIT
CONTROL
POWER
TEST
JACK
REMOTE
RESET
DDL
DDL
COMMUNICATIONS
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLTAGE INPUTS
FIELD WIRING
INTERNAL WIRING
IGNITION
PILOT
MAIN VALVE(S)
1K
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
LIMITS
1K1
2K1
FLAME SIGNAL
TEST
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
RS485
1
2
3
L1
(HOT)
L2
3
6
2K2
4K1
10
8
9
4K
5K
3K
2K
F
G
22
1
ALARM
3K1
4
L2
1
M11184
C
D
A
B
S445A
STOP
START
4
5
6
2
R4155A
100 VAC, RM7885
200 VAC, EC7885
Weather
The 7885A is not designed to be weather tight. If installed
outdoors, the 7885A must be protected by an approved
weather-tight enclosure.
Mounting Wiring Subbase
NOTE:
For installation dimensions, see Fig. 1 or 2.
1. Mount the subbase in any position except horizontally
with the bifurcated contacts pointing down. The
standard vertical position is recommended. Any other
position decreases the maximum ambient temperature
rating.
2. Select a location on a wall, burner or electrical panel.
The Q7800 can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
servicing, installation, access and removal of the
7885A, Dust Cover, flame amplifier, flame amplifier
signal voltage probes, electrical signal voltage probes
and electrical field connections.
3. For surface mounting, use the back of the subbase as a
template to mark the four screw locations. Drill the pilot
holes.
4. Securely mount the subbase using four no. 6 screws.
Refer to Fig. 7 for proper subbase wiring. Figures 8, 9, 10 and
11 show optional connections for the 7885A.
Fig. 6. 7885A Internal block diagram. (See Fig. 7 for detailed wiring instructions.)