6
INSTALLATION AND WIRING
Wiring Base
Install the wiring base where the relative humidity never reaches the saturation point. The YZ300
(YZ320) Interlock Annunciation system is designed to operate in a maximum 90% relative humidity
continuous, non-condensing environment. Do not install the YZ300 (YZ320) where it can be sub-
jected to vibration in excess of 0.5G continuous maximum vibration. The BurnerLogix system is not
a weather tight enclosure. The standard vertical position is recommended. Allow at least one inch
clearance around the control for service and installation.
1.
Wiring must comply with all applicable codes, ordinances and regulations.
2.
Wiring must comply with NEC Class 1 (Line Voltage) wiring.
3.
Limits and interlocks must be rated to simultaneously carry and break current to the ignition
transformer, pilot valve and main fuel valve(s).
4.
Maximum wire lengths:
a. The maximum lead wire length is 200 ft. (61 meters) to terminal inputs (Operating limits,
interlocks, valves, etc.).
b. Modbus communications: The maximum cable length of wire is 3300 feet (1000 meters)
for RS-485.
A good ground system should be provided to minimize the effects of AC quality problems. A prop-
erly designed ground system meeting all the safety requirements will ensure that any AC voltage
quality problems, such as spikes, surges and impulses have a low impedance path to ground. A low
impedance path to ground is required to ensure that large currents involved with any surge voltages
will follow the desired path in preferences to alternative paths, where extensive damage may occur to
equipment.
Wiring bases 60-2872-1 and 60-2874-1 each contain a 24 position terminal block. Each terminal can
accept either 2 type 16 AWG wires or a single type 14 AWG wire. Each terminal is a clamp type ter-
minal that provides sufficient pressure against the wire.
For any interlock of the YZ300 (YZ320) that is not used, a jumper must be placed between
those two terminals. For example, if AUX LIMIT #7 is not used, a jumper must be placed from
terminal 59 to terminal 60.
The fuel select switch connects to terminals 45, 49 and 53.
Terminals 44 & 45, 49 & 50 and 53 & 54 are internally connected.
WARNING: Controls require safety limits utilizing isolated mechanical contacts. Electronic
limit switches may cause erratic operation and should be avoided.
