11
Common CHWS
Temp
AI7 IOB3 Used for lead lag option
Auto Water Temp
Reset
AI8 IOB3 User option, 4~20mA
Common CHWR
Temp
AI9 IOB3 Used for lead lag option
Head Pressure
Output
AO1 IOB3 Factory option
Guide Vane 2 Output AO3 IOB3
Spare Safety DI3 IOB3 User option, dry contact,
normal open
Power Request
Feedback
DI4 IOB3 Marine option
Evaporator Drain
Valve
DO1 IOB3
Condenser Drain
Valve
DO2 IOB3
Free Cooling Mode DO3 IOB3 Factory option
Power Request
Output
DO4 IOB3 Marine option
Entering Evap Water
Pressure
AI3 IOB4 User option, if IOB4
installed, same as follows
Leaving Evap Water
Pressure
AI4 IOB4 User option
Entering Cond Water
Pressure
AI5 IOB4 User option
Leaving Cond Water
Pressure
AI6 IOB4 User option
Evap Water Flow
Measurement
AI8 IOB4 User option, 4~20mA
Conde Water Flow
Measurement
AI9 IOB4 User option, 4~20mA
Chilled Water
Pump(Variable)
AO1 IOB4 User option, 4~20mA/0~5V
Condenser Water
Pump(Variable)
AO2 IOB4 User option, 4~20mA/0~5V
Tower Fan(Variable) AO3 IOB4 User option, 4~20mA/0~5V
Customer Alert DI3 IOB4 Marine option, dry contact
Free Cooling Start
Switch
DI4 IOB4 Marine option, dry contact
Chilled Water Pump DO1 IOB4 User option
Condenser Water
Pump
DO2 IOB4 User option
Tower Fan High DO3 IOB4 User option
Tower Fan Low DO4 IOB4 User option
Purge Level Switch
Low
cDI-01 SIOB User option
Purge Level Switch
High
cDI-02 SIOB User option
Purge Comp Suction
Temp
AI-01 SIOB User option
Purge Cond Valve DO-01 SIOB User option
Purge Comp Valve DO-02 SIOB User option
Purge Pumpout Valve DO-03 SIOB User option
Purge Drainage Valve DO-04 SIOB User option
Purge Regeneration
Valve
cDO-05 SIOB User option
Purge Discharge
Valve
cDO-06 SIOB User option
Purge Vaccum Pump DO-07 SIOB User option
Purge Compressor DO-08 SIOB User option
Purge Heater DO-10 SIOB User option
The electrical characteristics of the transmission Cables shall
be comprised of three conductors, (1.5 Pairs) two signals and
one ground of 20 AWG or larger with 100% shield plus a
tinned copper braid (65% coverage), embodied as one of the
following types is recommended by Carrier:
- Belden #8772 (for intra building, 60 deg C)
- Belden #85240 (high temperature, 150 deg C)
- Belden #89418 (plenum cable, 200 deg C)
When LEN-MODBUS gateway which described in section
3.1.4 is used in the system, the communication cable for LEN
and MODBUS sides should also follow this requirement.
The communication cable between ISM and IOB should be
as far away from high voltage cable and other disturbance
equipment as possible. The communication cable should be
as short as possible and should be separated from other
cables. Making the communication cable go through metal
shield conduct is preferred.
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