Microtek MHP1-HD Installation Manual Page 16
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16 OMRCPMICRO
Controller Inputs/Outputs
Analog inputs
Analog inputs are used to read the various temperatures and pressures on the chiller as well as any customer
supplied 4-20mA reset signals. The controller's internal regulated 5 VDC and 12 VDC supplies provide the
correct operating voltage for the sensors. See Table 2 for details.
Input No. Description
0 Leaving evaporator water temperature - Sensor is located in the leaving chilled water nozzle. The
signal is used for capacity control and freeze protection.
1 Evaporator pressure transducer circuit #1 - Sensor is located in the common circuit #1 suction line.
Used to determine suction saturated refrigerant pressure and temperature. This sensor also provides
refrigerant freeze protection for circuit #1.
2 Evaporator pressure transducer circuit #2 - Sensor is located in the common circuit #2 suction line.
Used to determine suction saturated refrigerant pressure and temperature. This sensor also provides
refrigerant freeze protection for circuit #2.
3 Condenser pressure transducer circuit #1 - Saturated refrigerant pressure and temperature.
4 Condenser pressure transducer circuit #2 - Saturated refrigerant pressure and temperature.
5 Transducer power voltage ratio signal - The signal is used to correct for differences between the
controller power supply and an ideal 5 VDC supply. The controller uses this information to ensure
temperature and pressure sensor accuracy and for alarm monitoring.
6 Evaporator water temperature reset
- A 4 to 20 milliamp DC signal from a building automation system
or temperature transmitter to reset the leaving chilled water set point. The impedance of the ADI board
is 249 ohms.
7 Demand limit
- A 4 to 20 milliamp signal from a building automation system to determine the maximum
number of cooling stages which may be energized. The impedance of the ADI board is 249 ohms.
8 Chiller/Templifier signal (on THR heat pumps only) - In place of the Demand Limit input, a 0 or 5 volt
signal from a unit mounted switch allows the unit to run in heat (0 volts - switch open) or cool (5 volts -
switch closed) modes.
9 Entering evaporator water temp (optional) - Sensor is located in the entering chilled water nozzle. The
signal is used for monitoring and for the return reset option if selected.
10 Entering condenser water temp (optional) (O.A. temp for air cooled units) - Sensor is located in the
common entering condenser water nozzle or located remotely as an outside air temp sensor for air
cooled units. This sensor is used for monitoring purposes only.
11 Leaving condenser water temperature
(standard on THR heat pumps; optional on WHR chillers) - For
WHRs, sensor is located in leaving water nozzle of one condenser only. For THRs, sensor is located in
common line of manifolded condenser head. The signal is used for capacity control on THRs and for
monitoring only on WHRs.
12 Percent of total unit amps
(optional) - A current transformer and adjustable voltage dropping resistor
located in the power side of the control box along with a voltage converter board sends a DC signal
proportional to total motor current to the microprocessor. O VDC = 0%, 4 VDC = 100%
13 Suction temp circuit #1 (optional) - Sensor located in a copper sleeve brazed to the circuit #1 suction
line measures refrigerant temperature to calculate superheat. This sensor is used for monitoring
purposes only.
14 Suction temp circuit #2 (optional) - Sensor located in a copper sleeve brazed to the circuit #2 suction
line measures refrigerant temperature to calculate superheat. This sensor is used for monitoring
purposes only.
15 Liquid line temp circuit #1 (optional) - Sensor located in a copper sleeve brazed to the circuit #1 liquid
line measures refrigerant temperature to calculate subcooling. This sensor is used for monitoring
purposes only.
- Operating Manual OMRCPMICRO 1
- Table of Contents 2
- Introduction 3
- General Description 4
- Optional Sensor Packages 5
- Controller Layout 6
- Component Data 7
- 8 OMRCPMICRO 8
- OMRCPMICRO 9 9
- Installation and Maintenance 10
- Optional sensors 11
- Field Wiring 12
- Digital input signals 13
- Digital outputs 13
- Condenser pump or fan starter 13
- PC connection 14
- Telephone line 14
- Software Identification 15
- Controller Inputs/Outputs 16
- Digital inputs 17
- Relay board outputs 18
- OMRCPMICRO 19 19
- 20 OMRCPMICRO 20
- OMRCPMICRO 21 21
- Remote Demand Limiting 22
- THR Heat/Cool Changeover 23
- Soft Loading 23
- Compressor Control 24
- Manual Operation 25
- Unit Status Modes 26
- Circuit Status Modes 27
- Head Pressure Control 28
- OMRCPMICRO 29 29
- 30 OMRCPMICRO 30
- Pumpdown Control 31
- Safety Systems 32
- Circuit Alarm Conditions 33
- 34 OMRCPMICRO 34
- System Alarm Conditions 35
- Other Conditions 36
- Normal Sequence of Operation 37
- Condenser control 38
- Low ambient start 38
- Start-Up and Shutdown 39
- Powering the control panel 40
- Temporary shutdown 40
- Extended shutdown 41
- Keypad/Display 42
- Password Information 43
- Keypad Key Functions 43
- Item group 44
- Action group 44
- Menu Descriptions 45
- Control menus 46
- OMRCPMICRO 47 47
- 48 OMRCPMICRO 48
- Alarm menus 49
- MicroTech Keypad Directory 50
- OMRCPMICRO 51 51
- Table 8, Control menu 52
- OMRCPMICRO 53 53
- 54 OMRCPMICRO 54
- Table 9, Alarm menu 55
- 56 OMRCPMICRO 56
- OMRCPMICRO 57 57
- 58 OMRCPMICRO 58
- Microprocessor control board 59
- 60 OMRCPMICRO 60
- ADI board 61
- Erroneous pressure readings 62
- Freezestat alarm condition 62
- Output board 63
- Testing Solid-State Relays 64
- PC monitoring 65
- 66 OMRCPMICRO 66
- OMRCPMICRO 67 67
- 68 OMRCPMICRO 68
- OMRCPMICRO 69 69
- 70 OMRCPMICRO 70
- OMRCPMICRO 71 71
- 72 OMRCPMICRO 72
- OMRCPMICRO 73 73
- 74 OMRCPMICRO 74
- OMRCPMICRO 75 75
- 76 OMRCPMICRO 76
- OMRCPMICRO 77 77
- 78 OMRCPMICRO 78
- OMRCPMICRO 79 79
- 80 OMRCPMICRO 80
- OMRCPMICRO 81 81
- 82 OMRCPMICRO 82
- OMRCPMICRO 83 83
- 84 OMRCPMICRO 84
- OMRCPMICRO 85 85
- 86 OMRCPMICRO 86
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