Unit installation

OMRCPMICRO 17

16 Liquid line temp circuit #2 (optional) - Sensor located in a copper sleeve brazed to the circuit #2 liquid

line measures refrigerant temperature to calculate subcooling. This sensor is used for monitoring

purposes only.

Table 2, Analog inputs

Input Function Location Range Resolution

0 Leaving Chw temperature Leaving Chw Nozzle -40 to 263°F 0.1°F

1 Circuit #1 Evaporator Pressure Circuit #1 Suction Line 5 to 145 psig 0.1 psi

2 Circuit #2 Evaporator Pressure Circuit #2 Suction Line 5 to 145 psig 0.1 psi

3 Circuit #1 Condenser Pressure - 20 to 450 psig 0.5 psi

4 Circuit #2 Condenser Pressure - 20 to 450 psig 0.5 psi

5 Voltage Ratio Signal EnGinn Power Supply - -

6 Chw Reset Signal Supplied By Others 4 to 20mA DC -

7 Demand Limit Signal Supplied By Others 4 to 20mA DC -

8 Entering Evaporator Water Temperature Entering Chw Nozzle -40 to 263°F 0.1°F

9 Entering Condenser Water Temperature Entering Condenser Water Nozzle -40 to 263°F 0.1°F

10 Leaving Conderser Water Temperature Leaving Condenser Water Nozzle -40 to 263°F 0.1°F

11 % Total Unit Amps Control Cabinet 0 to 4 VDC 1%

12 Circuit #1 Suction Temperature Circuit #1 Suction Line -40 to 263°F 0.1°F

13 Circuit #2 Suction Temperature Circuit #2 Suction Line -40 to 263°F 0.1°F

14 Circuit #1 Liquid Line Temperature Circuit #1 Liquid Line -40 to 263°F 0.1°F

15 Circuit #2 Liquid Line Temperature Circuit #2 Liquid Line -40 to 263°F 0.1°F

Digital inputs

Table 3, Digital inputs

Inpu

LED Description Circuit Closed Open

0 0 Mechanical high pressure switch Circuit #1 Normal High discharge pressure

1 1 Oil differential pressure switch Compressor 1 Normal Low oil pressure

2 2 Motor protection switch Compressor 1 Normal High motor temperature

3 3 Oil differential pressure switch Compressor 3 Normal Low oil pressure

4 4 Motor protection switch Compressor 3 Normal High motor temperature

5 5 System switch Unit Normal Unit shutdown

6 6 Phase/voltage monitor Unit Normal PVM alarm

7 7 Pumpdown switch Circuit #1 Normal Manual pumpdown

8 8 Mechanical high pressure switch Circuit #2 Normal High discharge pressure

9 9 Oil differential pressure switch Compressor 2 Normal Low oil pressure

10 10 Motor protection switch Compressor 2 Normal High motor temperature

11 11 Oil differential pressure switch Compressor 4 Normal Low oil pressure

12 12 Motor protection switch Compressor 4 Normal High motor temperature

13 13 Remote stop switch Unit Run Pumpdown & stop

14 14 Water flow switches Unit Normal No evaporator (condenser) flow

15 15 Pumpdown switches Circuit #2 Normal Manual pumpdown

Note: All Digital Inputs are 24 VAC. At 7.5 VAC to 24 VAC the digital input contacts are considered

closed. Below 7.5 VAC, the contacts are considered open.

Front panel mount

heat/cool switch front panel

mount heat/cool switch