1-2 750-166
Terminal No. Description Ratings
G Flame Sensor Ground
1
Earth G Earth Ground
1
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%).
2,5
5 Burner Motor 120 Vac, 9.8AFL, 58.8ALR (inrush).
6 Burner Controller and Limits 120 Vac, 1 mA.
7 Lockout/Running Interlock 120 Vac, 9A.
8 Pilot Valve/Ignition 120 Vac, 4.5A ignition and 50VA pilot duty.
3
9 Main Fuel Valve 120 Vac, 2A pilot duty.
4
10 Ignition 120 Vac, 4.5A Ignition.
3
F(11) Flame Sensor 60 to 220 Vac, current limited.
12 Firing Rate High Fire 120 Vac, 75 VA pilot duty.
13 Firing Rate Common 120 Vac, 75 VA pilot duty.
14 Firing Rate Low Fire 120 Vac, 75 VA pilot duty.
15 Firing Rate Modulate 120 Vac, 75 VA 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.
CB780/CB784
SPECIFICATIONS
TABLE 1—TERMINAL RATINGS.
Specifications
ELECTRICAL RATINGS, see Table 1:
Voltage and Frequency: 120 Vac (+10/-15%), 50 or
60 Hz (+/- 10%)
5
.
Keyboard Display Module: 13 Vdc peak full wave
rectified (+20/-15%).
Power Dissipation:
CB780/CB784: 10W maximum.
Display Module: 3W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, type
FRN or equivalent.
1
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 20A 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 frequencies, 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.
2
2000 VA maximum connected load to CB780/CB784 Assembly.
3
Can also be 120 Vac, 1A pilot duty.
4
Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.
5
Operating frequency chosen by CB780/CB784 selection.
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