5464597-YIM-B-0518
Johnson Controls Ducted Systems
69
Table 31: Cable for FC Buses and SA Buses in Order of Preference
Bus and Cable Type
Non-Plenum Applications
Plenum Applications
Part Number
O.D.
Part Number
O.D.
FC Bus:
22 AWG Stranded, 3-Wire Twisted Shielded Cable
1
1. We strongly recommend 3-wire (for FC bus) and 4-wire, 2 twisted-pair (for SA bus), 22 AWG stranded, shielded cable. A 22 gauge cable
offers the best performance for various baud rates, cable distances, and number of trunk devices primarily due to lower conductor-to-
conductor capacitance. Shielded cable offers better overall electrical noise immunity than non-shielded cable. Observe the shield
grounding requirements.
Anixter:
CBL-22/3-FC-PVC
Belden
®
: B5501FE
0.138 in.
Anixter: CBL-22/3-FC-PLN
Belden: B6501FE
0.140 in.
SA Bus (Terminal Block):
22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Shielded Cable
Anixter:
CBL-22/2P-SA-PVC
Belden: B5541FE
0.209 in.
Anixter: CBL-22/2P-SA-PLN
Belden: B6541FE
0.206 in.
SA Bus (Modular Jack):
26 AWG Solid 6-Wire, 3 Twisted-Pair Cable
2
2. We recommend 26 AWG solid, 6-wire (3 twisted pairs) cable as the best fit for fabricating modular cables with the modular jack housing
assembly. Be sure the cable you use fits the modular jack housing. The preassembled cables that are available from Anixter (Part No.
CBL-NETWORKxxx) use 24 gauge wire.
—
—
Anixter preassembled: CBL-
NETWORK25 CBL-
NETWORK50 CBL-
NETWORK75 CBL-
NETWORK100
0.15 in.
FC Bus:
22 AWG Stranded, 3-Wire Twisted Non-Shielded Cable
Belden: B5501UE
0.135 in.
Belden: B6501UE
0.131 in.
SA Bus (Terminal Block):
22 AWG Stranded, 4-Wire, 2 Twisted-
Pair Non-Shielded Cable
Belden: B5541UE
0.206 in.
Belden: B6541UE
0.199 in.
Table 32: Ignition Control Flash Codes
Flashes
Fault Conditions
Check
STEADY ON
Control Failure
Control
HEARTBEAT
Normal Operation
1
Not Applicable
2
Pressure Switch Stuck Closed
Pressure Switch
3
Pressure Switch Failed To Close
Venter Pressure Switch Vent Blocked
4
Limit Switch Open
Main Limit
AUX Limit
5
Flame Present With Gas Off First Stage Gas Valve
Energized With W1 Off Second Stage Gas Valve
Energized With First Stage Gas Valve Off
Gas Valve
6
Ignition Lockout
Gas Flow
Gas Pressure
Gas Valve
Flame Sensor
STEADY OFF
No Power Or Control Failure
24VAC or Control
