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4.4
WIRING INFORMATION
Use #18AWG (nonshielded) copper wire for all system wiring; thermostats may use 18-24AWG
wire. Thermostats and damper actuators may be located up to 300ft. (90m) from the control
module. All system wires should be tagged to identify thermostat, damper and equipment
wiring. Refer to Figure 4.2 for control module wiring diagram. It is strongly recommended that
a spare or third wire be run between the control module and each zone damper in the event
that a three (3) wire damper actuator is used or required in future.
4.5
CURRENT LIMITED OUTPUT TERMINALS
All output circuits on the SlimZone Premier control module incorporate self-resetting current
limiting devices which provide protection against excessive current draws caused by
circumstances such as wiring shorts on an output. These devices, referred to as polyfuses,
generally are activated when the current draw exceeds 2.5Amps. The value and the duration
of the excess current is taken into account. The polyfuses will allow excess currents of very
short duration (i.e., spikes) in order to prevent circuit interruptions by noisy lines or occasional
minor surges. In its current limiting mode, the polyfuses reduce the output current to milliamps.
NOTE: The low leakage current may be sufficient to produce a small voltage reading when
measured with a volt meter with a high input impedance.
When the cause of the excess current has been removed and the current draw is returned to a
value below 2.5Amps, the polyfuse will reestablish full output current; in some instances this
may take up to twenty (20) seconds. Polyfuses eliminate the need to replace blown fuses.
The SZP control module uses red LEDs to indicate when a problem exists with the current
being drawn from certain circuits. An LED exists for the following on-board circuits:
•
each zone damper circuit
•
each zone thermostat circuit (current limited @ 0.1Amp)
•
on the COOL terminal strip
•
on the HEAT terminal strip
10
SlimZone Premier
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