IOMM AGZ-5
AGZ 026B through 130B
25
Optional Features
Controls
Hot Gas Bypass
Hot gas bypass permits unit operation down to 10% of full load capacity. This option
includes a factory-mounted hot gas bypass valve, solenoid valve, and manual shutoff
valve for each circuit. See page 93 for further information.
Head Pressure Control
Optional fan VFD control allows unit operation down to 0°F (-18°C). (Not available
on 380 volt, 60 Hertz units.)
Water Flow Switch
(P/N 017503300) A water flow switch is available for field installation in the chilled
water piping to avoid evaporator freeze-up under low or no flow conditions. Terminals
are provided in the unit control center for field hook-up of the water flow switch. If
this option is not ordered with the unit, then a field supplied water flow switch must be
installed.
Alarm Bell
Bell for field installation and wiring to the control panel to provide remote indication
of unit alarm condition. See Field Wiring Diagram for connection locations.
BAS Interface (Protocol Selectability
)
Connection to Chiller
Connection to the chiller for all building automation systems (BAS) protocols will be
at the unit controller. An interface card, depending on the protocol being used, may
have been factory-installed in the unit controller (or it can be field installed).
Protocols Supported
Table 14, Standard Protocol Data
Protocol
Physical Layer
Data Rate
Controller
Other
BACnet
/IP or
BACnet/Ethernet
Ethernet 10 Base-T
10 Megabits/sec
MicroTech II
Reference ED 15062
BACnet MSTP
RS-485
9600, 19200 or
38400 bits/sec
MicroTech II
Reference ED 15062
LONWORKS
FTT-10A
78kbits/sec
MicroTech II
Reference ED 15062
Modbus RTU
RS-485 or RS-232
9600 or 19200
bits/sec
MicroTech II
Reference ED 15063
The interface kits on the MicroTech II controller are as follows:
•
BACnet Kit P/N 350147404: BACnet/IP, BACnet MS/TP, or BACnet Ethernet
•
LONWORKS Kit P/N 350147401: LonTalk (FTT-10A)
•
Modbus: Modbus RTU
The following functions are available through the BAS where possible. Exact
capabilities may vary depending on the protocol in use.
•
Enable/Disable chiller operation by setting the Unit Enable setpoint.
•
Select the operating mode by setting the Unit Mode setpoint.
•
Set the Cool LWT and Ice LWT setpoints.
•
Set the Network Limit variable.
•
Read Enable/Disable status of chiller
•
Read current operating mode and status (state) of chiller.
•
Read a description of each alarm when it occurs.
Summary of Contents for AGZ026BS
Page 103: ...IOMM AGZ 5 AGZ 026B through 130B 103...
Page 104: ...104 AGZ 026B through 130B IOMM AGZ 5...
Page 105: ......
