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028-0323-02_LIT-VZ7656R&VZ7656H_W-E01_EN
September 2019
T
ERMINAL
,
I
DENTIFICATION AND
F
UNCTION
Wiring
Terminal Use
Terminal
Identification
Description
Rooftop
Heat pump
RTU
HP
1 – Cool 2 Compressor
2
Y2
Output for cooling / compressor stage
number 2.
2 – Cool 1 Compressor
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
Reversing
valve
W2
O/B
Output for heating stage number 2 for
VZ7656R1000B
Output for reversing valve for
VZ7656H1000B
9 – By-pass damper
BPD
Local analog 0 - 10 VDC by-pass damper /
VFD output.
10 – Aux output
AU
Auxiliary output used to disable economizer
damper minimum position or control lighting
during unoccupied periods.
11 – Static pressure
SP
Local analog 0 – 5 VDC static pressure
input.
12 - DI1
DI
Configurable extra digital input. See
parameter section for more information.
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.
