Honeywell EC7890B1028 User Manual

EC7890 RM7890 · Edition 12.23
EN-5
3.5.3 Table 3. Terminal Ratings.
Terminal Number Description Ratings (RM7890A,B,C) Ratings (EC7890B)
G Flame Sensor Ground – –
Earth G Earth Ground
a
– –
L2(N) Line Voltage Common – –
3 Line Voltage Supply (L1)
120 Vac (+10%/-15%), 50 or
60Hz (±10%).
b
220-240 Vac (=10%/-15%), 50
or 60Hz (±10%).
4 Alarm 120 Vac, 1A pilot duty. 220-240 Vac, 1A pilot duty.
5 Unused – –
6 Burner Controller and Limits 120 Vac, 8A run, 43A inrush. 220-240 Vac, 5A (maximum).
7 Unused – –
8 Pilot Valve/Ignition. 120 Vac.
c
220-240 Vac, 4A at P.F. = 0.5,
20A inrush.
9 Main Fuel Valve. 120 Vac.
c
220-240 Vac, 4A at P.F. = 0.5,
20A inrush.
10 Ignition 120 Vac, 4.5A ignition.
c
220-240 Vac, 4A at P.F. = 0.2.
F(11) Flame Sensor 60 to 220 Vac, current limited. 60 to 220 Vac, current limited.
12 to 21 Unused. – –
22 Shutter 120 Vac, 0.5A (RM7890B). 220-240 Vac (EC7890B only).
d
a
The RM/EC7890 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 15A fuse (or breaker) in event of an internal short
circuit. The RM/EC7890 needs a low impedance ground connection to the equipment frame which, in turn, needs a low impe-
dance 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.
b
2000 VA maximum connected load to the RM/EC7890 Assembly.
c
See Tables 4 and 5 for device load combinations.
d
Requires 220-240 to 120 Vac, 10 Va minimum stepdown transformer to drive the shutter. Not applicable for C7061A1020,
C7061A1079, C7061F1003 or C7061F1011-N.
3.5.4 Table 4. Combinations for Terminals 8, 9, and 10.
Pilot Fuel 8 Main 9 Ignition 10
C F No Load
B F No Load
F F A
F No Load A
D F A
D D A
D No Load A
A B C D F
4.5A ignition
50 VA Pilot Duty plus
4.5A ignition.
180 VA ignition plus motor
valves with: 660 VA inrush,
360 VA open, 250 VA hold.
2A Pilot Duty.
65 VA Pilot Duty plus motor
valves with: 3850 VA inrush,
700 VA Open, 250 VA hold.

Honeywell EC7890B1028 Specifications

General

Brand	Honeywell
Model	EC7890B1028
Category	Relays
Language	English