7800 SERIES EC7890A,B/RM7890A,B RELAY MODULE
65-0204–1
2
SPECIFICATIONS
RM7890 Electrical Ratings, See Table 1A:
Voltage and Frequency: 100 Vac (+10/-15%), 50 or 60 Hz
(+/- 10%).
2
Power Dissipation: RM7890: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, type FRN
or equivalent.
Table 1A. RM7890 Terminal Ratings.
ORDERING INFORMATION
When purchasing replacement and modernization products from your 7800 SERIES distributor, refer to the TRADELINE®
Catalog for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Logistics
Honeywell Inc., 1985 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 951-1000
In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 2C9 International Sales
and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan,
Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
EC7890 Electrical Ratings, See Table 1B:
Voltage and Frequency: 200 Vac (+10/-15%), 50 or 60 Hz
(+/- 10%).
2
Power Dissipation: EC7890: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, type FRN
or equivalent.
1
The RM7890 must have an earth ground providing a connection between the subbase and the control panel or the equipment.
The earth ground wire must be capable of conducting the current to blow the 20A fuse (or breaker) in event of an internal short
circuit. The RM7890 needs a low impedance ground connection to the equipment frame which, in turn, needs a low
impedance connection to earth ground. For a ground path to be low impedance at RF frequencies, the connection must be
made with minimum length conductors having maximum surface areas. Wide straps or brackets rather than leadwires are
preferred. Be careful to verify that mechanically tightened joints along the ground path, such as pipe or conduit threads or
surfaces held together with fasteners, are free of nonconductive coatings and are protected against mating surface corrosion.
2
Range of allowable operating frequencies is 45 to 66 Hz.
3
2000 VA maximum connected load to 7890 Assembly.
4
Can also be 100 Vac, 1A pilot duty.
5
Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.
Terminal No.
Description
Ratings
G
Flame Sensor Ground
Earth G
Earth Ground
1
L2(N)
Line Voltage Common
3
Line Voltage Supply (L1)
100 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).
2,3
4
Alarm
100 Vac, 1A pilot duty.
5
Unused
6
Burner Controller and Limits
100 Vac, 3A pilot duty or 1A pilot duty, 4.5A ignition.
7
Unused
8
Pilot Valve/Ignition
100 Vac, 4.5A Ignition and 50 VA pilot duty.
4
9
Main Fuel Valve
100 Vac, 2A pilot duty.
5
10
Ignition
100 Vac, 4.5A ignition.
4
F(11)
Flame Sensor
60 to 220 Vac, current limited.
12
Unused
13
Unused
14
Unused
15
Unused
16
Unused
17
Unused
18
Unused
19
Unused
20
Unused
21
Unused
22
Shutter
100 Vac, 0.5A (RM7890B).