McQuay MicroTech II Operation Manual
McQuay MicroTech II is an advanced rooftop unit controller designed to provide precise and efficient control of heating, ventilation, and air conditioning (HVAC) systems. With its user-friendly interface, flexible scheduling options, and comprehensive alarm monitoring capabilities, the MicroTech II empowers users to optimize comfort and energy efficiency in their buildings.
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© 2000 McQuay International
MicroTech II™
Applied Rooftop Unit Controller
Space Comfort Control (SCC)
• Used with McQuay models: RPS, RFS, RCS, RPR, RFR, RDT, RDS,
RAR and RAH
Operation Manual OM 138
Group: Applied Systems
Part Number: OM138
Date: April 2001
Discharge Cooling
Disch Air= 55.0°F
Clg Capacity= 50%
Eff Clg Spt= 55°F
MicroTech II™
Applied Rooftop Unit Controller
Space Comfort Control (SCC)
• Used with McQuay models: RPS, RFS, RCS, RPR, RFR, RDT, RDS,
RAR and RAH
Operation Manual OM 138
Group: Applied Systems
Part Number: OM138
Date: April 2001
Discharge Cooling
Disch Air= 55.0°F
Clg Capacity= 50%
Eff Clg Spt= 55°F
2
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Display Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypad/Display Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypad/Display Menu Reference . . . . . . . . . . . . . . . . . . . . . . . . . 13
System Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setup/Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Active Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Previous Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Operator’s Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Determining Unit Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
UnitStatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Clg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Htg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Clg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Htg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Auto/Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Ctrl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Appl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Occ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Occ Src . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Bypass Time (Tenant Override). . . . . . . . . . . . . . . . . . . . . . . 48
Emergency Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting Controller Date and Time . . . . . . . . . . . . . . . . . . . . . 49
Internal Daily Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Holiday Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
One Event Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Optimal Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
External Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Network Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Alarm Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
About Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Remote Alarm Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Local Alarm Indication (Keypad/Display) . . . . . . . . . . . . . . . . 53
Remote Alarm Clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Configuring Remote Alarm Output. . . . . . . . . . . . . . . . . . . . . 54
Setting Alarm Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Unit Configuration/Service Parameters . . . . . . . . . . . . . . . . . . . . . 56
Calibrate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Zone (Space) Temperature Sensor . . . . . . . . . . . . . . . . . . . . 56
Miscellaneous Service Parameters . . . . . . . . . . . . . . . . . . . . 57
Control Timer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Manual Output Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Description of Operation . . . . . . . . . . . . . . . . . . . . 61
Operating States and Sequences . . . . . . . . . . . . . . . . . . . . . . . . . 61
About Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Operating State Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 61
Operating State Sequence Chart. . . . . . . . . . . . . . . . . . . . . . 64
Startup Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Before Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Fan Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Heat/Cool Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
0-30% Outdoor Air Damper Control . . . . . . . . . . . . . . . . . . . . . . . . 68
Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 68
100% Outdoor Air Damper Control. . . . . . . . . . . . . . . . . . . . . . . . . 68
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Economizer Changeover Method. . . . . . . . . . . . . . . . . . . . . . 69
Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 70
Cooling: Multistage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Low Ambient Cooling Lockout . . . . . . . . . . . . . . . . . . . . . . . . 73
Compressor Staging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Condenser Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Circuit Pumpdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Cooling: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Heating: Multistage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 79
Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 80
Heating: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 84
Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 84
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Enabling Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Dehumidification Cooling Operation. . . . . . . . . . . . . . . . . . . . 85
Dehumidification Heating Operation. . . . . . . . . . . . . . . . . . . . 86
Energy Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Enthalpy Wheel Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Exhaust Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Energy Recovery Bypass Damper Control. . . . . . . . . . . . . . . 88
Return Fan Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Direct Building Static Pressure Control . . . . . . . . . . . . . . . . . 88
Return Fan Direct Position Control. . . . . . . . . . . . . . . . . . . . . 89
SAF/RAF Differential OA Reset . . . . . . . . . . . . . . . . . . . . . . . 89
Unoccupied Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Unoccupied Heating (Night Setback) . . . . . . . . . . . . . . . . . . . 89
Unoccupied Cooling (Night Setup) . . . . . . . . . . . . . . . . . . . . . 90
Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Alarm Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
MicroTech II DDC Features . . . . . . . . . . . . . . . . . . 99
Direct PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Cascaded PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Proportional Band and Integral Time . . . . . . . . . . . . . . . . . . 100
Adjusting PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . 100
Correcting System Instability (“Hunting”) . . . . . . . . . . . . . . . 100
Correcting System “Sluggishness” . . . . . . . . . . . . . . . . . . . . 101
Software Identification and Configuration. . . . . 102
Main Control Board (MCB) Configuration. . . . . . . . . . . . . . . . . . . 102
Main Control Board (MCB) Data Archiving. . . . . . . . . . . . . . . . . . 103
Keypad/Display Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Display Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypad/Display Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypad/Display Menu Reference . . . . . . . . . . . . . . . . . . . . . . . . . 13
System Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setup/Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Active Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Previous Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Operator’s Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Determining Unit Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
UnitStatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Clg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Htg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Clg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Htg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Auto/Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Ctrl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Appl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Occ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Occ Src . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Bypass Time (Tenant Override). . . . . . . . . . . . . . . . . . . . . . . 48
Emergency Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Setting Controller Date and Time . . . . . . . . . . . . . . . . . . . . . 49
Internal Daily Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Holiday Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
One Event Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Optimal Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
External Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Network Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Alarm Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
About Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Remote Alarm Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Local Alarm Indication (Keypad/Display) . . . . . . . . . . . . . . . . 53
Remote Alarm Clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Configuring Remote Alarm Output. . . . . . . . . . . . . . . . . . . . . 54
Setting Alarm Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Unit Configuration/Service Parameters . . . . . . . . . . . . . . . . . . . . . 56
Calibrate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Zone (Space) Temperature Sensor . . . . . . . . . . . . . . . . . . . . 56
Miscellaneous Service Parameters . . . . . . . . . . . . . . . . . . . . 57
Control Timer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Manual Output Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Description of Operation . . . . . . . . . . . . . . . . . . . . 61
Operating States and Sequences . . . . . . . . . . . . . . . . . . . . . . . . . 61
About Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Operating State Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 61
Operating State Sequence Chart. . . . . . . . . . . . . . . . . . . . . . 64
Startup Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Before Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Fan Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Heat/Cool Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
0-30% Outdoor Air Damper Control . . . . . . . . . . . . . . . . . . . . . . . . 68
Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 68
100% Outdoor Air Damper Control. . . . . . . . . . . . . . . . . . . . . . . . . 68
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Economizer Changeover Method. . . . . . . . . . . . . . . . . . . . . . 69
Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 70
Cooling: Multistage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Low Ambient Cooling Lockout . . . . . . . . . . . . . . . . . . . . . . . . 73
Compressor Staging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Condenser Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Circuit Pumpdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Cooling: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Heating: Multistage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 79
Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 80
Heating: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 84
Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 84
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Enabling Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Dehumidification Cooling Operation. . . . . . . . . . . . . . . . . . . . 85
Dehumidification Heating Operation. . . . . . . . . . . . . . . . . . . . 86
Energy Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Enthalpy Wheel Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Exhaust Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Energy Recovery Bypass Damper Control. . . . . . . . . . . . . . . 88
Return Fan Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Direct Building Static Pressure Control . . . . . . . . . . . . . . . . . 88
Return Fan Direct Position Control. . . . . . . . . . . . . . . . . . . . . 89
SAF/RAF Differential OA Reset . . . . . . . . . . . . . . . . . . . . . . . 89
Unoccupied Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Unoccupied Heating (Night Setback) . . . . . . . . . . . . . . . . . . . 89
Unoccupied Cooling (Night Setup) . . . . . . . . . . . . . . . . . . . . . 90
Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Alarm Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
MicroTech II DDC Features . . . . . . . . . . . . . . . . . . 99
Direct PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Cascaded PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Proportional Band and Integral Time . . . . . . . . . . . . . . . . . . 100
Adjusting PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . 100
Correcting System Instability (“Hunting”) . . . . . . . . . . . . . . . 100
Correcting System “Sluggishness” . . . . . . . . . . . . . . . . . . . . 101
Software Identification and Configuration. . . . . 102
Main Control Board (MCB) Configuration. . . . . . . . . . . . . . . . . . . 102
Main Control Board (MCB) Data Archiving. . . . . . . . . . . . . . . . . . 103
Keypad/Display Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 105
OM 138 3
McQuay, MicroTech II, and RoofPak are registered trademarks of McQuay International.
Microsoft is a registered trademark of Microsoft Corporation.
Windows is a trademark of Microsoft Corporation.
Copyright © 2000 McQuay International. All rights reserved throughout the world.
Document Number: OM 138
Revision: April 2001
McQuay, MicroTech II, and RoofPak are registered trademarks of McQuay International.
Microsoft is a registered trademark of Microsoft Corporation.
Windows is a trademark of Microsoft Corporation.
Copyright © 2000 McQuay International. All rights reserved throughout the world.
Document Number: OM 138
Revision: April 2001
4 OM 138
Introduction
This manual provides information regarding the MicroTech
II control system used in the McQuay RoofPak applied roof-
top unit product line. It specifically describes the sequences
of operation and programmable options for units with fac-
tory equipped space comfort control (SCC) software. It also
includes information regarding how to use the keypad/dis-
play to enter and display data.
For information regarding MicroTech II components,
input/output configurations, field wiring options and require-
ments, and service procedures, refer to IM696, MicroTech II
Applied Rooftop Unit Controller. For installation and startup
instructions and general information regarding a particular
rooftop unit, refer to the applicable model-specific installa-
tion and maintenance manual (refer to Table 1).
Table 1: Model-Specific Rooftop Unit Installation
Literature
Rooftop Unit Model Installation & Maintenance Data
Bulletin Number
RPS (18-40 tons)
IM 157RFS (18-40 tons)
RCS (18-40 tons)
RPS (45-135 tons)
IM 485RFS (45-135 tons)
RCS (45-135 tons)
RDT IM 486
RDS (800 & 802) IM 178
RAH IM 487
NOTICE
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, may cause interference to radio communications. It has been tested
and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user is required to correct the interference at his own expense.
McQuay International disclaims any liability resulting from any interference or for the correction
thereof.
WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Connections and service to the MicroTech II control panel must
be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.
WARNING
Excessive moisture in the control panel can cause hazardous working conditions and improper
equipment operation.
When servicing this equipment during rainy weather, the electrical components in the main control panel
must be protected from the rain.
Introduction
This manual provides information regarding the MicroTech
II control system used in the McQuay RoofPak applied roof-
top unit product line. It specifically describes the sequences
of operation and programmable options for units with fac-
tory equipped space comfort control (SCC) software. It also
includes information regarding how to use the keypad/dis-
play to enter and display data.
For information regarding MicroTech II components,
input/output configurations, field wiring options and require-
ments, and service procedures, refer to IM696, MicroTech II
Applied Rooftop Unit Controller. For installation and startup
instructions and general information regarding a particular
rooftop unit, refer to the applicable model-specific installa-
tion and maintenance manual (refer to Table 1).
Table 1: Model-Specific Rooftop Unit Installation
Literature
Rooftop Unit Model Installation & Maintenance Data
Bulletin Number
RPS (18-40 tons)
IM 157RFS (18-40 tons)
RCS (18-40 tons)
RPS (45-135 tons)
IM 485RFS (45-135 tons)
RCS (45-135 tons)
RDT IM 486
RDS (800 & 802) IM 178
RAH IM 487
NOTICE
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, may cause interference to radio communications. It has been tested
and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user is required to correct the interference at his own expense.
McQuay International disclaims any liability resulting from any interference or for the correction
thereof.
WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Connections and service to the MicroTech II control panel must
be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.
WARNING
Excessive moisture in the control panel can cause hazardous working conditions and improper
equipment operation.
When servicing this equipment during rainy weather, the electrical components in the main control panel
must be protected from the rain.
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Key Features
- Controls heating, cooling, and ventilation systems
- User-friendly interface with keypad and display
- Flexible scheduling options for optimal comfort and energy efficiency
- Comprehensive alarm monitoring for quick troubleshooting
- Remote alarm indication for timely response
- Calibrate mode for accurate temperature readings
- Control timer settings for precise operation
- Manual output control for maintenance and testing
Related manuals
Frequently Answers and Questions
What HVAC systems does the MicroTech II controller work with?
The MicroTech II controller is compatible with McQuay rooftop unit models RPS, RFS, RCS, RPR, RFR, RDT, RDS, RAR, and RAH.
How do I set the date and time on the controller?
To set the date and time, go to the Setup/Service menu, select 'System Settings,' and then choose 'Date/Time.' Use the keypad to enter the correct date and time.
How do I configure remote alarm output?
To configure remote alarm output, go to the Setup/Service menu, select 'Alarm Settings,' and then choose 'Remote Alarm Output.' You can set the output type, delay time, and alarm priority.
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