13 750-265
Table 3. Recommended Grounding Practices.
Ground Type Recommended Practice
Earth ground 1. Earth ground must be capable of conducting enough current to blow the 20A
fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface
area ground conductors. If a leadwire must be used, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of
nonconductive coatings and protected against corrosion on mating surfaces.
Signal ground Use the shield of the signal wire to ground the device to the signal ground terminals
[3(c)] of each device. Connect the shield at both ends of the chain to earth ground.
Table 4. CB Falcon Contact.
Commercial
Connector Function Description and Rating (All Models)
J1 1
2 FLAME ROD INPUT
3 FLAME ROD COMMON
4UV
5 SHUTTER
6UV COMMON
J2 1 TACH Tachometer Input (Tach) Tachometer input.
2 25V Electronic Blower Motor Power (25 VDC)
3 PWM Digital modulation (PWM) Output Digital modulation signal out.
4 GND Ground pin for Fan interface and power
J3 a a Local Modbus RS-485 +
b b Local Modbus RS-485 -
c c Local Modbus Ground (G)
a a Global Modbus RS-485 +
b b Global Modbus RS-485 -
c c Global Modbus RS-485 ground
1 1 EnviraCOM Data (1)
2 2 EnviraCOM Receive (2)
3 3 EnviraCOM (3)
J4 12 EARTH GROUND Earth ground
Not Used Not Used
J4 10 L2 Power Supply Neutral
Not Used Not Used
J4 8 L1 24VAC, 120 VAC –15%, +10%; 50/60Hz, +/-10%
J4 7 PUMP A 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 6 PUMP A 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 5 PUMP B 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 4 PUMP B 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 3 PUMP C 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 2 PUMP C 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J4 1 Conditional spare
J5 7 BLOWER 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J5 6 BLOWER 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
J5 3 Conditional spare
J5 4 EXT. IGNITION 24VAC, 120 VAC: 44.4 ALR, 7.4 Amps run
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