Honeywell RM7890B2014 Installation Instructions

RM7890A,B/EC7890A,B 7800 SERIES RELAY MODULES
5 32-00157-03
Table 3. Terminal Ratings.
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 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.
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 or C7061F1003.
Table 4. Combinations for Terminals 8, 9, and 10.
Terminal Number Description Ratings (RM7890A,B,C) Ratings (EC7890A,B)
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.
5Unused — —
6 Burner Controller and Limits 120 Vac, 8A run, 43A inrush. 220-240 Vac, 5A (maximum).
7Unused — —
8 Pilot Valve/Ignition.
120 Vac.
c
220-240 Vac, 4A at P.F. = 0.5, 20A
inrush.
9Main 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
Pilot Fuel 8 Main 9 Ignition 10
CFNo Load
BFNo Load
FFA
FNo LoadA
DF A
DDA
DNo LoadA
AB 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 RM7890B2014 Specifications

General

Brand	Honeywell
Model	RM7890B2014
Category	Relays
Language	English