CB780/CB784 RELAY MODULES
3
32-00207—01
a
The CB780/CB784
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 CB780/CB784 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 fre-
quencies, the connection must be made by minimum length conductors having maximum surface areas. Wide straps or
brackets are preferred rather than leadwires. Be careful to ensure 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 CB780/CB784 Assembly.
c
Can also be 120 Vac, 1A pilot duty, Terminals 8 & 10 sum of the “c“ loads must not exceed 8A.
d
Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to +140°F (-40°C to +40°C).
Storage: -40°F to +150°F (-40°C to +66°C).
Humidity: 85% RH continuous, noncondensing.
Vibration: 0.5G environment.
Dimensions:
Refer to Fig. 1 and 2.
Weight:
CB780/CB784: 1 pound 10 ounces, unpacked.
Keyboard Display Module: 4 ounces, unpacked.
IMPORTANT:
Flame Detection System available for use with
CB780/CB784. To select your Plug-in Flame Sig-
nal Amplifier and matching Flame Detector, see
Table 2.
Table 1. Terminal Ratings.
Terminal No.
Description
Ratings
G
Flame Sensor Ground
a
—
Earth G
Earth Ground
a
—
L2(N)
Line Voltage Common
—
3
Alarm
120 Vac, 1A pilot duty.
4
Line Voltage Supply (L1)
120 Vac (+10%/-15%), 50 or 60 Hz (±10%).
b
5
Burner Motor
120 Vac, 9.8AFL, 58.ALR (inrush).
6
Burner Controller and Limits
120 Vac, 1 mA.
7
Lockout/Running Interlock
120 Vac, 8A.
8
Pilot Valve/Ignition
120 Vac, 4.5A ignition and 50VA pilot duty.
c
9
Main Fuel Valve
120 Vac, 2A pilot duty.
d
10
Ignition
120 Vac, 4.5A ignition.
c
F(11)
Flame Sensor
60 to 220 Vac, current limited.
12
Firing Rate High Fire
120 Vac, 75VA pilot duty.
13
Firing Rate Common
120 Vac, 75VA pilot duty.
14
Firing Rate Low Fire
120 Vac, 75VA pilot duty.
15
Firing Rate Modulate
120 Vac, 75VA pilot duty.
16
Unused
—
17
Unused
—
18
Low Fire Switch Input
120 Vac, 1 mA.
19
High Fire Switch Input
120 Vac, 1 mA.
20
Preignition Interlock Input
120 Vac, 1 mA.
21
Interrupted/Pilot Valve/First Stage Oil Valve 120 Vac, 2A pilot duty.
22
Shutter
120 Vac, 0.5A.