Emerson VH, DE, VE, DH manual Communications, Nonvolatile Memory, DIP Switches, Control Outputs

Advanced Microprocessor Controls Setup

3.8.2Nonvolatile Memory

All critical information is stored in nonvolatile memory. Setpoints, setup parameters, and component run hours are kept inside the microcontroller in EEPROM. Information retained for the alarm history is kept in non-volatile RAM.

3.8.3DIP Switches

Equipment options are selected and enabled using DIP switches 1 to 7. These are located at the upper left of the control board and are labeled SW1. Switch 1 is at the top. These switches are factory set and should not require any user changes. The setting and function of the switches can be read from the LCD display and are also described in more detail in 4.8.4 - DIP Switches.

3.8.4Control Outputs

Active control outputs are indicated with LEDs on the lower section of the control board. Each LED is lit if the control output is active (on). The LEDs assist in troubleshooting the system.

Table 6 Control output LEDs

LED	Control Output
R5	Heat Rejection
LLSV1	Liquid Line Solenoid Valve 1
HGBP1	Hot Gas By-Pass or Compressor Unloader Valve
C1	Compressor 1
C2	Compressor 2
RH1	Reheat Stage 1 or Hot Gas Reheat Solenoid
RH2	Reheat Stage 2
RH3	Reheat Stage 3
HUM	Humidifier
HGBP2	Hot Gas Bypass 2 or Compressor Unloader Valve 2
FAN	Main Fan
HMV	Humidifier Make-Up Valve
LLSV2	Liquid Line Solenoid Valve 2

3.9Communications

The control system uses a two-wire, RS-422 channel to communicate with remote monitoring systems via Liebert Site Products. This communication, directly out of the control, uses a proprietary protocol. Your unit can have a variety of different Site Product devices wired to this port depending on the monitoring system you are using.

Liebert Site Product Device

•SiteScan Centralized Monitoring System—Stand-alone facility monitoring system

•SiteLink BMS Interface Module—For Modbus or BACnet communication to a third party moni- toring system

•OpenComms Network Interface Card—For Ethernet connection using SNMP protocol

•OpenComms D.O. Interface Card—For discrete outputs of status and alarm conditions

•Mini-Remote—Stand-alone individual unit remote monitor

•ECA2 Communication Adapter—For remote service monitoring directly or via a modem

Consult the user manual of the appropriate device for specific installation and operation information.

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