Microtek MHP1-HD Installation Manual Page 13
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OMRCPMICRO 13
Digital input signals
Remote contacts for all digital inputs into the MicroTech controller must be dry contacts suitable for the 24
VAC control signals from the reciprocating control panel. Do not connect 120 VAC control power to these or
any other connecting circuits.
Remote stop/start
If remote stop/start control is preferred, then remove the jumper between terminals #140 and #141 on TB7.
When the remote stop/start switch is open, the controller will be in the "off: remote Sw" mode. The unit is
enabled when the switch is closed.
Chilled water flow switch
The chilled water flow switch is connected to field wiring terminals #142 and #143 on TB7. When the chilled
water pump is enabled, the MicroTech controller checks for proof-of-flow through the flow switch digital input.
Digital outputs
The MicroTech output device is a normally open solid-state relay with an on-board, replaceable 5 amp fuse.
The status of all outputs are shown by individual red LEDs.
Chilled water pump relay
The optional chilled water pump relay is connected to terminal #10 on TB2. When the unit is enabled, the
chilled water pump relay is energized. Be sure the relay coil is rated for a maximum load of 1.8 amps at 120 VAC.
External alarm annunciator circuitry
An audible alarm connected to the Alarm Output of the reciprocating control panel is highly recommended to
make certain the operator is alerted to any alarm condition.
The MicroTech panel can activate an external alarm circuit when an alarm or pre-alarm condition is detected.
The alarm signal is de-energized during normal operations. During an alarm condition the alarm circuit will
energize and the alarm status light will be lit. During a pre-alarm condition, the alarm output and status light
will pulse "on" for one-half second and "off" for four seconds.
24 VAC is available at field wiring terminal #19 to power a bell, light, relay, or other external alarm devices. The
installing contractor must provide and install an alarm enunciator rated for a maximum load of 1.8 amps at 24
VAC. See the field wiring diagrams at the end of this manual for terminal locations.
Note: The alarm signal is not active during a power failure and will not provide a "Loss of Power"
alarm.
115 VAC power for the optional control transformer is obtained from the 3-phase power connection provided
by the electrical contractor.
Condenser fan wiring for chillers without condensers
The first fan of each circuit is to be wired in parallel with the first compressor stage for each circuit. Each
refrigerant circuit has three additional digital outputs available for refrigerant head pressure control. Each
output will energize an additional bank of condenser fans with each bank consisting of 1 or 2 fans, depending
on the size of the unit. The relays used to energize the fan motors must be rated for 120 VAC, 1.5 amps
maximum per coil. If a McQuay APD condenser is used, then the relays will be supplied by the factory. Relays
and fans are denoted as M12 through M24. The first number indicates the circuit while the second number
indicates the fan or fan bank number. See the Field Wiring Diagram and Staging Schematics at the end of this
manual for more detail.
Condenser pump or fan starter
Terminals #11 and #12 on TB2 on water-cooled units are reserved for starting the first fans of each circuit on a
remote condenser or for starting a single condenser pump. The relay coils should be rated for a maximum load
- 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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