Honeywell CVL4022ASVAV1 Engineering Manual page 19

IMPORTANT:
If the controller is not connected to a good earth ground, the
controller's internal transient protection circuitry is
compromised and the function of protecting the controller from
noise and power line spikes cannot be fulfilled. This could
result in a damaged circuit board and require replacement of
the controller.
NEURON® SERVICE PIN
The NEURON® Service Pin pushbutton (when pressed)
transmits the Service Message to the network, regardless of
the controller's current mode of operation (see Fig. 18).
CAUTION
Equipment Damage Hazard.
Can cause controller damage or failure.
Do not use any metal object to press the NEURON® Service
Pin. Use a plastic rod or wood device (such as a pencil with
the lead broken off) to press the pin. Using a metal object can
damage the circuitry of the controller.
LONWORKS BUS CONVENIENCE JACK
The LONWORKS Bus connection is provided by plugging the
Serial LONTALK Adapter (SLTA) connector into the
LONWORKS® Bus Jack (see Fig. 18).
1 1 1 1 1 1 1 2 2 2 2 2
3 4 5 6 7 8 9 0 1 2 3 4
1 2 3 4 5 6 7 8 9 0 1 2
LONWORKS ® BUS JACK (LABELLED SRV JACK)
NEURON® SERVICE PIN (LABELLED SRV PIN)
Fig. 18. Controller terminal connections, NEURON®
Service Pin and LONWORKS® Bus Jack for the
CVL4022AS-VAV1, and CVL4024NS-VAV1 (CVL4024NS-
19
TERMINALS 13-24
1 1
TERMINALS 1-12
M28650
VAV1 shown).
31-00083—02