Viconics VZ7656E Installation Guide - Manual (Page 6)

6 | VZ7656E1000W Installation Guide
T
ERMINAL
, I
DENTIFICATION AND
F
UNCTION
Wiring
Terminal Use
Terminal
Identification
Description
1
– Cool 2
Y2
Output for cooling / compressor stage
number 2.
2
– Cool 1
Y1
Output for cooling / compressor stage
number 1.
3 - Fan G Output for the fan.
4 - 24 V ~ Hot RC
Power supply of controller, hot side
(Delivered from the RTU).
5 - 0 V ~ Com C
Power supply of controller, common side.
Also used as reference for the analog BPD
output when used (Delivered from the RTU).
6- Heat Switch Leg RH
24 VAC switched leg for the heating stages.

If heating stages are part or RTU,
install a jumper across RC & RH.

If heating stages are part of separate
equipment with a different power
supply, feed external switched power
leg through RH without installing a
jumper across RC & RH.
7
– Heat 1
W1 Output for heating stage number 1.
8- Heat 2 W2 Output for heating stage number 2.
9
– By-pass damper
BPD
Local analog 0 - 10 VDC by-pass damper /
VFD output.
10 – Economizer Output EC
0-10 VDC analog fresh air damper /
economizer output.
11
– Static pressure
SP
Local analog 0
– 5 VDC static pressure
input.
12 – AI AI 0-10 VDC analog input for airflow transmitter
13 - RS RS
Return air temperature sensor input. If
sensor fails, controller will use the on-board
thermistor sensor to control if the
communication is lost.
14 - Scom Scom Reference input for DI 1, RS, OS & DS.
15 - OS OS Outside air temperature sensor input.
16 - DS DS Discharge air temperature sensor input.