26
ACZ 010A through 039A
IOMM ACZ1
Inputs/Outputs
Table 9, Inputs and Outputs
Analog Inputs
#
Description
Signal Source
Range
2
Evaporator Refrigerant Pressure
0.1 to 0.9 VDC
0 to 132 psi
3
Condenser Refrigerant Pressure
0.1 to 0.9 VDC
3.6to 410 psi
5
Outside Ambient Temperature
Thermister (10k at 77
°
F, 25
°
C)
-58 to 212°F
Analog Outputs
#
Description
Output Signal
Range
1
None
Digital Inputs
#
Description
Signal
Signal
1
Unit OFF Switch
0 VAC (Stop)
24 VAC (Auto)
2
Remote Start/Stop
0 VAC (Stop)
24 VAC (Start)
3
Evaporator Water Flow/Air Flow Switch
0 VAC (No Flow)
24 VAC (Flow)
4
Motor Protection
0 VAC (Fault)
24 VAC (No Fault)
6
Phase Voltage Fault
0 VAC (Fault)
24 VAC (No Fault)
7
Stage 1 Request
0 VAC (Stop)
24 VAC (Start)
8
Stage 2 Request
0 VAC (Stop)
24 VAC (Start)
Digital Outputs
#
Description
Load
Output OFF
Output ON
1
Alarm
Alarm Indicator
Alarm OFF
Alarm ON
3
Liquid Line
Solenoid
Cooling OFF
Cooling ON
4
Motor Control Relay #1
Starter
Compressor OFF
Compressor ON
5
Motor Control Relay #2
Starter
Compressor OFF
Compressor ON
6
Condenser Fan #1
Fan Contactor
Fan OFF
Fan ON
7
Condenser Fan #2
Fan Contactor
Fan OFF
Fan ON
8
Condenser Fan #3
Fan Contactor
Fan OFF
Fan ON
Setpoints
The setpoints shown in Table 10 are held in a non-volatile memory and remembered during power
off, are factory set to the Default value, and can be adjusted within the value shown in the Range
column.
The PW (password) column indicates the password level that must be entered in order to change the
setpoint. Passwords are as follows:
O = Operator [0100]
M = Manager, M level settings are not normally changed for chilled water air-conditioning
applications.