Daikin RCS - SCU Main Control Board I;O Details

Table 5: SCU Main Control Board I/O
I/O Cong. Code Condition
PolyCool 600 Main Controller – SCU Pos. 1=1
Analog Inputs – 10K NTC
# Point Comments Cong. Code Condition
AI 1 Discharge Temperature 10K Thermistor (STD) All
AI 2 Return Temperature 10K Thermistor (STD) All
AI 3 Outdoor Temperature 10K Thermistor (STD) All
Universal Inputs/Outputs
# DI AI DO AO Point Comments Cong. Code Condition
X 1 X Entering WaterTemperature 10K Thermistor (STD) 3 = 1 & 4 > 3
X 2 X Low Pressure 1 and 2
1
1K & 2K Ohm Input 3 = 1 & 4 > 3
X 2 X Chilled Wtr 0–10 VDC 3 = 2 or 3 = 3
X 3 X Space Temperature 10K Thermistor (STD) All
X 4 X Zone Setpoint 5–15 kOhm 2 = 0
X 4 X DAT Reset 0–10 VDC / 4–20 mA 2 = 1
X 5 X Enthalpy & Freeze Sw
2
1K & 1.5K Ohm Input
Enth: 8 = 3
Frz: 3 = 2, 3 = 3, 8 = 4, 10 = 1, 10 = 5
X 6 X Bypass Valve 2–10 VDC 3 = 1
X 6 X Water Regulating Valve 2–10 VDC 3 = 1 & 8 <> 4 & 22 =1
X 7 X Economizer
0–10 VDC (Air Econo) / 2–10 VDC
(Water Econo)
8 = 3 or 8 = 4
X 8 X Mixed Air Temp 10K Thermistor (STD) All
Digital Inputs — Dry Contacts
# Point Comments Cong. Code Condition
DI 1 Air Flow Switch Dry Contact All
DI 2 Filter Switch Dry Contact All
Digital Inputs — 24V
# Point Comments Cong. Code Condition
DI 3 Remote START / STOP External 24V All
DI 4 Emergency OFF External 24V All
Digital Inputs — 115V
# Point Comments Cong. Code Condition
DI 5 High Pressure 1 115 VAC Input 3 = 1 & 4 > 1 or 3 = 4
DI 6 High Pressure 2 115 VAC Input 3 = 1 & 4 > 1
Digital Outputs — Relay (SPST, Normally Open, 230 VAC 3 Amp
# Point Comments Cong. Code Condition
DO 1 Compressor 1 3 = 1
DO 2 Compressor 3 3 = 1 & 4 > 4
DO 3 Compressor 2 3 = 1
DO 4 Compressor 4 3 = 1 & 4 > 6
DO 5 Supply Fan All
DO 6 NA
DO 7 Outdoor Damper OPEN / CLOSE 8 <> 3
DO 8 Pump ON/OFF 3 = 1 & 4 > 1
Digital Outputs – Solid State Relays, 24-230 VAC, 0.5 A
# Point Comments Cong. Code Condition
DO 9 Alarm All
DO 10 Fan Operation All
1. When used for LP1 and LP2, LP1 is considered CLOSED when resistance value is 0–799 or 1250–1800. Otherwise LP1 is considered OPEN. LP2 is considered
CLOSED when the resistance value is 0–1249, otherwise LP2 is considered OPEN.
2. Enthalpy switch is considered CLOSED when resistance value is 0–799 or 1250–1800. Otherwise it is considered OPEN. Freezestat is considered CLOSED when
the resistance value is 0–1249, otherwise it is considered OPEN.
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