Microtek MHP1-HD Installation Manual Page 4
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4 OMRCPMICRO
General Description
The MicroTech Unit Control Panel, available on some McQuay ALR, WHR, and THR products, contains a
Model 250 microprocessor based controller which provides all monitoring and control functions required for
the safe, efficient operation of the unit. The operator can monitor all operating conditions by using the panels
built in 2-line by 16-character display and keypad or by using an IBM compatible computer running McQuay
Monitor software. In addition to providing all normal operating controls, the MicroTech controller monitors all
safety devices on the unit and will shut the system down and close a set of alarm contracts if an alarm
condition develops. Important operating conditions at the time an alarm occurs are retained in the controllers
memory to aid in troubleshooting and analysis.
The system is protected by a simple password scheme which only allows access by authorized personnel. A
valid password must be entered into the panel keypad by the operator before any setpoints may be altered.
Features of the MicroTech Control Panel
Ø Enhanced head pressure control on air-cooled units resulting in increased total unit SEER during
transitional seasons.
Ø Preemptive control of high discharge pressures prior to a fault.
Ø 12-key keypad for adjusting water temperature set points, low water temperature cutout, high pressure
cutout, suction pressure cutout, and freeze protection. The operator can use the keypad to monitor
various operating conditions, setpoints or alarm messages.
Ø Easy-to-read 2-line by 16-character display for plain English readout of operating temperatures and
pressures, operating modes or alarm messages.
Ø Security password protection against unauthorized changing of set points and other control parameters.
Ø Complete plain English diagnostics to inform the operator of pre-alarms and alarms. All alarms are time and
date stamped so there is no guessing of when the alarm condition occurred. In addition, some operating
conditions that existed at the instant of shutdown can be recalled to aid in isolating the cause of the
problem.
Ø Soft Loading feature to reduce electrical consumption and peak demand charges during start-up.
Ø Adjustable load pulldown rate reduces over-shoot during loop pulldown.
Ø Easy integration into building automation systems via separate 4-20 milliamp signals for chilled water reset
and demand limiting (chillers only).
Ø BAS communication capability via McQuay’s open protocol strategy to over 10 major BAS manufacturers.
Ø Internal time clock for on/off scheduling.
Ø 14 holidays / dates with programmable duration.
Ø Communications capabilities for local system monitoring, changing of set points, trend logging, remote
reset, alarm and event detection via IBM-compatible PC. The optional modem kit supports the same
features from an off-site PC running the McQuay Monitor software.
Ø Manual control mode to override automatic unit staging, useful for system checkout.
Ø Pressure transducers for direct reading of system pressures.
- 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
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- Table 9, Alarm menu 55
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- 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
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