McQuay AGS 206A, Руководство по эксплуатации

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24 OM AGSB-5
Unit Controller
Inputs/Outputs
The following parameters are analog inputs to this controller. They are used internally as
needed and are sent to the correct pLAN addresses for use by other controllers or displays.
Table 10, Unit Analog Inputs
# Description Signal Source Range
1 Outdoor Ambient Temperature Thermistor (10k@25°C) -58
°
F to 212°F
2 Demand Limit 4-20 mA Current 25-100 %RLA
3 Chilled Water Reset 4-20 mA Current
0 to10 degrees
60
°
F max inlet
4 Leaving Evaporator Water Temperature Thermistor (10k@25°C)
-58
°
F to 212°F
5 Entering Evaporator Water Temperature Thermistor (10k@25°C)
-58
°
F to 212°F
The following parameters are digital inputs to this controller. They are used internally as
needed and are sent to the correct pLAN addresses for use by other controllers or displays.
The status of digital inputs can be viewed on Unit Status screen #4, on the unit controller
only.
Table 11, Unit Digital Inputs
# Description Signal Signal
1 Unit Switch 0 VAC (Stop) 24 VAC (On)
2 Remote Switch 0 VAC (Stop) 24 VAC (Start)
3 Evaporator Water Flow Switch 0 VAC (No Flow) 24 VAC (Flow)
4 Mode Switch 0 VAC (Cool) 24 VAC (Ice)
5 Open
6 Open
The following parameters are digital outputs from this controller. Their values are sent to
the correct pLAN addresses for use by other controllers or displays. The status of digital
outputs can be viewed on Unit Status screen #4, on the unit controller only.
Table 12, Unit Digital Outputs
# Description Load Output OFF Output ON
1 Open
2 Evaporator Water Pump 1 Pump Contactor Pump OFF Pump ON
3 Evaporator Water Pump 2 Pump Contactor Pump OFF Pump ON
4 Evap Heaters Heater relay Heater OFF Heater ON
5 Open
6 Open
7 Open
8 Alarm Remote Alarm No Alarm Stop Alarm
Setpoints
At power-up, the slave node checks if the master node is operational and if so, it sets its
copy of the setpoint equal to the master’s. Otherwise, the setpoint remains unchanged.
During normal operation, any time the master setpoint changes, the slave is updated as well.
The PW (password) column indicates the password that must be active in order to change
the setpoint. Codes are as follows:
O = Operator, M = Manager