Operator’s Guide. McQuay MicroTech II

Operator’s Guide

The following “Operator’s Guide” sections provide information regarding the day-to-day operation of the MicroTech II

Applied Rooftop Unit Controller. Topics covered are such common tasks as scheduling, displaying and clearing alarms, and setting the controller for manual operation. Programmable parameters that affect the operation being described are listed at the beginning of each applicable sub-section. The factory default values for these parameters are shown in italic letters.

For detailed information regarding the control processes and

their programmable parameters, refer to “Description of

Operation” on page 61.

Determining Unit Status

The System menu includes several parameters that can be used to determine the overall status of the unit. There are five key items in this menu that summarize the current operating condition of the unit. These are: UnitStatus= , Clg

Capacity= , Htg Capacity= , Clg Status=, and Htg Status= and are described in the following sections.

UnitStatus

The UnitStatus= parameter in the System menu is very useful because the item summarizes the overall operating condition of the unit. Each of the possible conditions is referred to as an “operating state”. The following are the possible operating states displayed by the UnitStatus= parameter.

l l l l l l l l l l l l l l

Off

Calib

Startup

Recirc

Fan Only

Econo

Cooling

MWU

Heating

Min DAT

UnocEcon

UnocClg

UnocHtg

Man Ctrl

The unit makes transitions between these operating states as conditions change. For detailed information regarding these

states, refer to “Operating States and Sequences” on page 61.

Clg Capacity

Clg Capacity= is a status item which indicates the percentage of the unit maximum cooling capacity currently operating. When the unit is equipped with chilled water cooling, 0-

100% is displayed as the cooling valve actuator strokes from the closed to open position. When the unit is equipped with compressorized cooling, the percentage value changes incrementally based on the number operating cooling stages.

Htg Capacity

Htg Capacity= is a status item which indicates the percentage of the unit maximum heating capacity currently operating. When the unit is equipped with modulating heat, 0-

100% is displayed as the heating valve actuator strokes from the closed to open position. When the unit is equipped with staged heat, the percentage value changes incrementally based on the number operating heating stages

Clg Status

Clg Status= is a status item which indicates whether or not cooling (economizer and/or mechanical) is currently allowed. If cooling is disabled, the reason is indicated. The following are descriptions of the various “Clg Status” states.

All Clg

The Clg Status= parameter indicates “All Clg” when both of the following conditions are true:

1. The unit is equipped with an economizer and the outdoor air is suitable for free cooling ( OA Ambient= parameter in the OA Damper menu indicates “Low”).

2. The unit is equipped with chilled-water cooling or the unit is equipped with compressorized cooling and the outdoor air is warm enough to allow compressor operation ( OA Temp= parameter in the Temperatures menu has risen above the OATComp Lock= parameter by more that the OATLock Diff= setting in the Zone Cooling menu).

In this state the unit uses the economizer, mechanical cooling or both as required to maintain the cooling set points.

Econo

The Clg Status= parameter indicates “Econo” when both of the following conditions are true:

1. The unit is equipped with an economizer and the outdoor air is suitable for free cooling ( OA Ambient= parameter in the OA Damper menu indicates “Low”).

2. The unit is equipped with compressorized cooling and the outdoor air is too cool to allow compressor operation

( OA Temp= parameter in the Temperatures menu has dropped below the OATComp Lock= setting in the Zone

Cooling menu).

In this state the unit only uses the economizer to maintain the cooling set points. Compressor operation is disabled.

Mech Clg

The Clg Status= parameter indicates “Mech Clg” when both of the following conditions are true:

OM 138 43

1. The unit is not equipped with an economizer or the outdoor air is not suitable for free cooling ( OA Ambient= parameter in the OA Damper menu indicates “High”).

2. The unit is equipped with chilled-water cooling or the unit is equipped with compressorized cooling and the outdoor air is warm enough to allow compressor operation ( OA Temp= parameter in the Temperatures menu has risen above the OATComp Lock= parameter by more that the OATLock Diff= setting in the Zone Cooling menu).

In this state the unit uses mechanical cooling to maintain the cooling set points. Economizer operation is disabled, and the outdoor air damper is maintained at the Eff Min OA Pos= value.

Off Amb

The Clg Status= parameter indicates “Off Amb” when both of the following conditions are true:

1. The unit is not equipped with an economizer or outdoor air is not suitable for free cooling ( OA Ambient= parameter in the OA Damper menu indicates “High”).

2. The unit is equipped with compressorized cooling and the outdoor air is too cool to allow compressor operation

( OA Temp= in the Temperatures menu has dropped below the OATComp Lock= setting in the Zone Cooling menu).

In this state both economizer and mechanical cooling operation is disabled.

For applications that use an economizer, the “Off Amb” state should not occur if the economizer changeover and mechanical cooling lockout set points are adjusted properly. If it does occur, it may indicate a problem with the enthalpy control device.

Off Alm

The Clg Status= parameter indicates “Off Alm” when cooling related alarms cause all cooling circuits to be completely disabled and economizer operation is not available. For detailed information regarding cooling alarms and their

effect on the unit operation, Refer to “Alarm Control” on page 91. All cooling is disabled during the “Off Alm” state.

Off Sw

The Clg Status= parameter indicates “Off Sw” when the field cooling enable terminals 101 to 105 on terminal block

TB2 in the main control panel are not made (binary input

MCB-BI3 is off). Refer to the “Manual Cooling and Heating

Enable/Disable” section of IM 696, MicroTech Applied Rooftop Unit Controller . All cooling is disabled during the “Off

Sw” state.

Off Man

The Clg Status= parameter indicates “Off Man” when cooling is disabled via the Ctrl Mode= parameter in the System menu. This occurs when the Ctrl Mode= parameter is set to either “Heat Only” or “Fan Only.” All cooling is disabled during the “Off Man” state.

Off Net

The Clg Status= parameter indicates “Off Net” when cooling is disabled by a network signal affecting the Appl Mode= parameter in the System menu. This is the case when the

Appl Mode= parameter is set to either “Heat Only” or “Fan

Only.” All cooling is disabled during the “Off Net” state.

Off None

The Clg Status= parameter indicates “Off None” when the unit is equipped with no cooling of any kind.

Htg Status

Htg Status= is a status item which indicates whether or not heating is currently allowed. If heating is disabled, the reason is indicated. The following are descriptions of the various “Htg Status” states.

Htg Ena

The Htg Status= parameter indicates “Htg Ena” when the unit is equipped with some kind of heating and the outdoor air is cool enough to allow heating operation and heat is not disabled for some other reason. ( OA Temp= parameter in the

Temperatures menu has dropped below the OATHtg Lock= parameter by more that the OATLock Diff= setting in the

Zone Heating menu). In this state the unit uses the heat as required to maintain the heating set points.

Off Amb

The Htg Status= parameter indicates “Off Amb” when the unit is equipped with heat and the outdoor air is too warm to allow heating operation ( OA Temp= parameter in the Temperatures menu has risen above the OATHtg Lock= setting in the Zone Heating menu). In this state heating operation is disabled.

Off Alm

The Htg Status= parameter indicates “Off Alm” when heating related alarms cause all heating to be completely disabled. For detailed information regarding heating alarms and

their effect on the unit operation, refer to “Alarm Control” on page 91. All heating is disabled during the “Off Alm” state.

Off Sw

The Htg Status= parameter indicates “Off Sw” when the field heating enable terminals 101 to 106 on terminal block

TB2 in the main control panel are not made (binary input

MCB-BI4 off). Refer to the “Manual Cooling and Heating

Enable/Disable” section of IM 696, MicroTech Applied Rooftop Unit Controller . Heating is disabled during the “Off Sw” state.

Off Man

The Htg Status= parameter indicates “Off Man” when heating is disabled via the Ctrl Mode= parameter in the System menu. This occurs when the Ctrl Mode= parameter is set to either “Cool Only” or “Fan Only.” Heating is disabled during the “Off Man” state.

44 OM 138

WARNING

Electric shock and moving machinery hazard. Can cause personal injury or death.

When the unit is in any Off operating state, power is not removed from the unit controller or components.

Remove power by turning off the disconnect-switch before servicing line voltage equipment or entering the unit.

Off Net

The Htg Status= parameter indicates “Off Net” when heating is disabled by a network signal affecting the Appl Mode= parameter in the System menu. This occurs when the Appl

Mode= parameter is set to either “Cool Only” or “Fan Only.”

Heating is disabled during the “Off Net” state.

Off None

The Htg Status= parameter indicates “Off None” when the unit is equipped with no heating.

Auto/Manual Operation

The System menus includes two parameters that determine whether cooling, heating, both cooling and heating or neither are enabled during unit operation. These are the Ctrl Mode= and Appl Mode= parameters. The Occupancy menu includes five parameters that relate to the occupied/unoccupied condition (start/stop) of the unit. These are the Occupancy= , Occ

Mode= , Occ Src= , Bypass Time= , and Emerg Override= parameters. These are described in the following sections.

Ctrl Mode

Table 10: Programmable Parameters

Keypad/Display ID

Menu Name

System

Item Name

Ctrl Mode= Auto

Parameter Name

Control Mode

Cool Only

When the Control Mode is set to “Cool Only”, cooling operation is allowed to operate to maintain the cooling set points.

Heating operation is disabled ( Htg Status= is “Off Man”).

Heat Only

When the Control Mode is set to “Heat Only”, heating operation is allowed to operate to maintain the heating set points.

Cooling operation is disabled ( Clg Status= is “Off Man”).

Fan Only

When the Control Mode is set to “Fan Only”, the fans are allowed to operate but cooling and heating operation is disabled ( Clg Status= and Htg Status= are “Off Man”).

Auto

When the Control Mode is set to “Auto”, the heat/cool, cool only, heat only, and fan only decision is determined by the

Appl Mode= parameter, which is set via a network signal as described below. The Appl Mode= parameter has no effect on unit operation unless the Control Mode is set to “Auto.”

Appl Mode

Table 11: Programmable Parameters

Keypad/Display ID

Menu Name

System

Item Name

Appl Mode= Heat/Cool

Parameter Name

Application Mode

The unit cooling and heating can be set up for automatic heat/cool, cool only, heat only, fan only, or network cool/heat operation by setting the Control Mode. The unit can also be manually disabled via the Control Mode. The following are descriptions of the six available Control Mode selections.

Off

When the Control Mode is set to “Off”, the UnitStatus= is

“Off Man” and the unit is completely disabled.

Heat Cool

When the Control Mode is set to “Heat/Cool”, both cooling and heating operation are allowed to operate as required to maintain the cooling and heating set points.

The unit heating and cooling can be set up for automatic heat/cool, heat only, cool only or fan only operation based on a network signal by setting the Ctrl Mode= parameter to

“Auto.” With the Ctrl Mode= parameter set to “Auto”, the heat/cool, cool only, heat only, and fan only decision is determined by the Application Mode. The Application Mode is set by a network signal. The following sections describe the five available Application Mode selections.

Note: The Application Mode has no effect on the unit operation unless the Ctrl Mode= parameter is set to

“Auto.”

Off

When the Application Mode is set to “Off”, the UnitStatus= is “Off Net” and the unit is completely disabled, including unoccupied heating (night set back) and unoccupied cooling

(night set up) operation.

OM 138 45

Heat/Cool

When the Application Mode is set to “Heat/Cool”, both cooling and heating operation are allowed to operate as required to maintain the cooling and heating set points.

Cool Only

When the Application Mode is set to “Cool Only”, cooling operation is allowed to operate as required to maintain the cooling set points. Heating operation is disabled ( Htg Status= is “Off Net”).

Heat Only

When the Application Mode is set to “Heat Only”, heating operation is allowed to operate as required to maintain the heating set points. Cooling operation is disabled ( Clg Status= is “Off Net”).

Fan Only

When the Application Mode is set to “Fan Only”, the fans are allowed to operate but cooling and heating operation is disabled ( Clg Status= and Htg Status= are “Off Net”).

Occupancy

Occupancy= is a status item which indicates whether the unit is in an occupied or unoccupied mode of operation. The following are descriptions of the various “Occupancy” states.

Occ

The Occupancy= parameter indicates “Occ” when the unit is in the occupied mode. In this mode, the unit generally starts and runs continuously, cooling and heating as required to maintain the occupied temperature set points.

1 The unit is in the occupied mode if any of the following conditions are true:

1. A field supplied external time clock or a tenant override switch signal in the form of a set of dry contacts is closed across terminals 101 and 102 on the unit field terminal block TB2 (binary input MCB-BI1 on). For detailed information refer to “External Time Clock or

Tenant Override (Non-Timed)” in IM 696, MicroTech

Applied Rooftop Unit Controller .

2. The Occ Mode= parameter is set to “Occ.”

3. The Occ Mode= parameter is set to “Auto” and the unit internal time clock schedule, optimal start function, one time event schedule, or an optional network schedule indicates an occupied period.

Unocc

The Occupancy= parameter indicates “Unocc” when the unit is in the unoccupied mode. In the unoccupied mode, the unit is off and remains off unless unoccupied cooling (night set up or purge) or unoccupied heating (night set back) opera-

1. The unit will not start regardless of the occupancy mode when the UnitStatus= parameter indicates “Off Sw”, “Man

Ctrl”, “Off Alm”, “Off Net”, or “Off Man”. For a description of

these operating states, refer to “Operating State Descriptions” on page 61.

tion is activated. Refer to “Unoccupied Control” on page 89.

The unit is in the unoccupied mode if all of the following conditions are true:

1. The Occ Mode= parameter is set to either “Unocc” or

“Auto” and any field supplied external time clock or a tenant override switch contacts are open across terminals 101 and 102 on the unit field terminal block (TB2).

For detailed information refer to “External Time Clock or Tenant Override (Non-Timed)” in IM 696, MicroTech

Applied Rooftop Unit Controller .

2. The Occ Mode= parameter is set to either “Unocc” or

“Auto” and the Bypass Time= parameter indicates 0 time.

3. The Occ Mode= parameter is not set to “Occ.”

4. The Occ Mode= parameter is set to “Auto” and the unit internal time clock schedule, optimal start function, one time event schedule, and optional network schedule all indicate an unoccupied period.

Note: The unit reverts to unoccupied mode if the calibrate function is active. For more information on cali-

brate mode, refer to “Calibrate Mode” on page 56

Bypass

The Occupancy= parameter indicates “Bypass” when the unit is in the bypass mode. In the bypass mode the unit starts

up and function as it does in occupied mode.

1 The unit is in

the bypass mode if the Bypass Time= parameter is set to a non-zero value. For details regarding how the Bypass Time=

is set, refer to “Bypass Time (Tenant Override)” on page 48

Occ Mode

Table 12: Programmable Parameters

Keypad/Display ID

Menu Name

Occupancy

Item Name

Occ Mode= Auto

Parameter Name

Occupancy Mode

The unit can be set up for automatic or manual occupied/unoccupied operation by setting the Occupancy Mode.

The following are descriptions of the four available Occupancy Mode selections.

Auto

When the Occupancy Mode is set to “Auto”, the unit operates automatically. This means that the Occupancy= parameter changes automatically between “Occ” and Unocc”. The

Occupancy= parameter indicates “Occ” and the unit starts if either the unit internal time clock schedule, optimal start function, one time event schedule, or an optional network schedule indicate an occupied period

1 . The

Occupancy= parameter indicates “Unocc” and the unit stops if the unit internal time clock schedule, optimal start function, one time event schedule, and an optional network schedule all indicate an unoccupied period.

Exceptions:

46 OM 138

1. The Occupancy= parameter is “Occ” and the unit starts if a field supplied external time clock or a tenant override switch signal in the form of a set of dry contacts is closed across terminals 101 and 102 on the unit field terminal block TB2 (binary input MCB-BI1 on)

1

. For detailed information refer to “External Time Clock or

Tenant Override (Non-Timed)” in IM 696, MicroTech

Applied Rooftop Unit Controller .

2. The Occupancy= parameter indicates “Bypass” and the unit starts if the Bypass Time= parameter is set to a nonzero value

1 .

3. The Occupancy= parameter indicates “Unocc” and the unit stops if the Calibrate function is activated. Refer to

“Calibrate Mode” on page 56.

4. While the Occupancy= parameter indicates “Unocc”, the unit can start and operate in the unoccupied heating

(night set back) or the unoccupied cooling (night set up

or purge) mode 1

. Refer to “Unoccupied Control” on page 89.

Occ

When the Occupancy Mode is set to “Occ”, the Occupancy= parameter indicates “Occ” and the unit starts and runs con-

tinuously in the occupied mode 1 . Any scheduling commands

are prevented from shutting down the unit.

Exception :

1. The Occupancy= parameter indicates “Unocc” and the unit stops if the Calibrate function is activated. Refer to

“Calibrate Mode” on page 56.

Unocc

When the Occupancy Mode is set to “Unocc”, the Occupancy= parameter indicates “Unocc” and the unit is off and remains off unless unoccupied cooling (night set up or purge) or unoccupied heating (night set back) operation is

activated. Refer to “Unoccupied Control” on page 89 1

.

Exceptions:

1. The Occupancy= parameter changes to “Occ” and the unit starts if a field supplied external time clock or a tenant override switch signal in the form of a set of dry contacts is closed across terminals 101 and 102 on the unit field terminal block TB2 (binary input MCB-BI1 on)

1 . For detailed information refer to “External Time

Clock or Tenant Override (Non-Timed)” in IM 696,

MicroTech Applied Rooftop Unit Controller .

2. The Occupancy= parameter changes to “Bypass” and the unit starts if the Bypass Time= parameter is set to a non-zero value

1 .

1. The unit will not start regardless of the occupancy mode when the UnitStatus= parameter indicates “Off Sw”, “Man

Ctrl”, “Off Alm”, “Off Net”, or “Off Man”. For a description of

these operating states, refer to “Operating State Descriptions” on page 61.

Bypass

When the Occupancy Mode is set to “Bypass”, the Bypass

Time= parameter is set to the Bypass Time Increment= value.

The Occupancy= parameter indicates “Bypass” and the unit starts and operates as in the occupied mode until the Bypass

Time= parameter times out. Any scheduling commands are prevented from shutting down the unit while the bypass operation is active.

1

Note: Once the Occupancy Mode is set to “Bypass” and the Bypass Time= parameter is set to the Bypass

Time Increment= value, the Occupancy Mode automatically reverts to the “Auto” setting.

Exception:

1. The Occupancy= parameter indicates “Unocc” and the unit stops if the Calibrate function is activated. Refer to

“Calibrate Mode” on page 56.

Occ Src

Occ Src= is a status item which indicates the input source or function that is responsible for setting the Occupancy= parameter to “Occ.” There are a number of things that can change the Occupancy= parameter to “Occ” and the Occ

Src= parameter is very helpful in determining which function has started the unit.

None

The Occ Src= parameter indicates “None” when the Occupancy= parameter indicates “Unocc” or “Bypass.”

Int Sched

The Occ Src= parameter indicates “Int Sched” when the

Occupancy= parameter indicates “Occ” due to the unit internal schedule or one event schedule indicating an occupied period. Refer to “Scheduling” on page 48.

Net Sched

The Occ Src= parameter indicates “Net Sched” when the

Occupancy= parameter indicates “Occ” due to a network schedule indicating an occupied period.

Occ Mode

The Occ Src= parameter indicates “Occ Mode” when the

Occupancy= parameter indicates “Occ” due to the Occupancy Mode being manually set to “Occ.”

Remote Sw

The Occ Src= parameter indicates “Remote Sw” when the

Occupancy= parameter indicates “Occ” due to a field supplied external time clock or a tenant override switch signal in the form of a set of dry contacts is closed across terminals

101 and 102 on the unit field terminal block TB2 (binary input MCB-BI1 on). For detailed information refer to

“External Time Clock or Tenant Override (Non-Timed)” in

IM 696, MicroTech Applied Rooftop Unit Controller .

OM 138 47

Bypass Time (Tenant Override)

Table 13: Programmable Parameters

Keypad/Display ID

Menu Name

Occupancy

Timer Settings

Item Name

Occ Mode= Auto

Bypass Time= 0 min

Bypass= 120 min

Parameter Name

Occupancy Mode

Bypass Timer

Bypass Time Increment

There are two types of tenant override functions: timed and non-timed. Timed override uses the Bypass Timer and

Bypass Time Increment to place the unit into bypass mode.

Non-timed override uses a simple field supplied SPST switch to override unoccupied operation.

Timed Tenant Override

The tenant-override button provided with the optional zone temperature sensor packages is used to override unoccupied operation for a preprogrammed time period. This time period is set with the Bypass Time Increment. This value can be adjusted from 0 to 300 minutes (default is 120 minutes).

When an occupant presses and releases the tenant-override button on the zone temperature sensor (ZNT1), the Bypass

Timer is set equal to the Bypass Time Increment. (The button must be held for at least 1 second but not more than 30 seconds.) The unit then starts and runs in the bypass mode which is the same as occupied mode except that it is temporary.

1 The Bypass Timer begins timing out and the unit runs until the timer expires. If the tenant override button is pressed again while the unit is operating in bypass mode, the

Bypass Timer is reset to the Bypass Time Increment and the unit continues to operate. For example, assume that the

Bypass Time Increment is 120 minutes. One press of the override button provides at 120 minutes of unit operation. If the button is pressed again 60 minutes later, the Bypass

Timer is reset to 120 minutes, and a total of 180 minutes of uninterrupted operation results.

Note: The same operation occurs if, instead of pressing the override button on a zone temperature sensor, the Occupancy Mode is set to “Bypass.” Once set to

“Bypass”, the Occupancy Mode automatically reverts to the “Auto” setting once the Bypass Timer is set to the Bypass Time Increment.

Non-Timed Tenant Override

If an field supplied external time clock or a tenant override switch signal in the form of a set of dry contacts is closed across terminals 101 and 102 on the unit field terminal block

TB2 (binary input MCB-BI1 on), the unit is placed into occupied mode

1

. When this switch is open, the unit is con-

1. The unit will not start regardless of the occupancy mode when the UnitStatus= parameter indicates “Off Sw”, “Man

Ctrl”, “Off Alm”, “Off Net”, or “Off Man”. For a description of

these operating states, refer to “Operating State Descriptions” on page 61.

trolled by any active scheduling function (internal time clock schedule, optimal start function, one time event schedule, or an optional network schedule). If there is no active scheduling function, the unit remains in the unoccupied mode. For detailed information refer to “External Time Clock or Tenant

Override (Non-Timed)” in IM 696, MicroTech Applied Rooftop Unit Controller .

Operator Override

The Bypass Timer can be manually set. When the Bypass

Timer is set to a non-zero value, the unit starts and runs in

the bypass mode regardless of any scheduling features.

1 The

unit stops when the timer expires. The Bypass Timer can be set from 0-300 minutes.

Note: If the Bypass Timer remaining time is larger than the Bypass Time Increment, pressing the tenant override button on the space sensor has no effect. If the Bypass Timer remaining time is less than the

Bypass Time Increment, pressing the tenant override button resets the Bypass Timer to the Bypass

Time Increment value.

Emergency Override

Table 14: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Parameter Name

Occupancy Emerg Override= Norm

Emergency Override Mode

Flag

The unit can be shutdown by setting the Emergency Override Mode Flag. When the Emergency Override Mode Flag is set to “Off”, the UnitStatus= parameter indicates “Off

Net” and the unit remains off regardless of any time schedule or other occupied or unoccupied start commands. The only way a unit can be restarted is to set Emergency Override

Mode Flag back to “Norm.” The Emergency Override Mode

Flag can either be set manually at the unit keypad or via a network signal.

Scheduling

The rooftop unit can be scheduled for operation by using the following three methods:

1) Unit internal time scheduling functions

2) External time clock function

3) Network time scheduling function

Provided the unit is not locally or remotely disabled, the unit operates when any of these scheduling functions is calling for occupied operation. Conversely, the unit enters the unoccupied mode when all of these scheduling functions are calling for unoccupied operation. Therefore, any unused scheduling functions should be set for continuous unoccu-

pied operation. Refer also to“Auto/Manual Operation” on page 45.

48 OM 138

The next four sections: “Setting Controller Date and Time”,

“Internal Daily Scheduling”, “Holiday Scheduling”, and One

Event Scheduling” describe functions related to the internal unit scheduling functions. These are followed by a section describing the optimal start function which can be use with internal scheduling and network scheduling. This is followed by two sections that describe the external time scheduling and network time scheduling functions.

Setting Controller Date and Time

Table 15: Programmable Parameters

Keypad/Display ID

Menu Name

Time/Date

Item Name

Time= hh:mm:ss

Day= ddd

Date= dd-mm-yyyy

Parameter Name

Current Time

Current Day

Current Date

The MicroTech II controller uses the date and time to execute its internal scheduling functions. Once set, the battery backed internal time clock keeps the current time regardless of whether or not power is being supplied to the unit.

The time of day can be set by entering the hour (00-23), minute (00-59), and second (00-59) into three fields of the

Current Time. Note that MicroTech II uses “military” time.

The day of the week is not adjustable. The Current Day is set automatically by the controller based on the Current Date.

The current date can be set by entering the date (00-31), month (01-12) and year (1999-2155) into the three fields of the Current Date.

Internal Daily Scheduling

Table 16: Programmable Parameters

Keypad/Display ID

Menu Name

Daily Schedule

Item Name

Mon= 00:00 - 00:00

Tue= 00:00 - 00:00

Wed= 00:00 - 00:00

Thu= 00:00 - 00:00

Fri= 00:00 - 00:00

Sat= 00:00 - 00:00

Sun= 00:00 - 00:00

Hol= 00:00 - 00:00

Parameter Name

Monday Schedule

Tuesday Schedule

Wednesday Schedule

Thursday Schedule

Friday Schedule

Saturday Schedule

Sunday Schedule

Holiday Schedule

When the Occ Mode=

parameter, described in “Auto/Manual Operation” on page 45, is set to “Auto”, and the unit is

not disabled for other reasons, it starts and stops according to the controller internal schedule. One start and one stop time can be set for each day of the week and for designated holidays. An example of how to use the keypad to enter or mod-

ify a schedule is given in “Getting Started” on page 6.

As shown in Figure 5, each daily schedule has four adjust-

able fields: Start Hour, Start Minute, Stop Hour, and Stop

Minute. The schedule shown would cause the unit to start up at 6:30 a.m. and shut down at 6:00 p.m. every Monday, Tuesday and Wednesday.

Figure 5: Daily Schedule Fields

Menu Line

Item Line Being Edited

**Edit Mode

Mon= 06:30 - 18:00

Tue= 06:30 - 18:00

Wed= 06:30 - 18:00

Stop Minute

Stop Hour

Start Minute

Start Hour

For continuous unit operation, the schedule fields can be set to “00:00-23:59.” For no unit operation for the entire day, the schedule fields can be set to “00:00-00:00” (this is the default setting).

Holiday Scheduling

Table 17: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Daily Schedule Holiday= 00:00 - 00:00

Holiday Schedule Hol *= mmm dt - mmm dt

Parameter Name

Holiday Schedule

Holiday Period

Special operating hours can be scheduled for up to 16 holiday periods during the year by using the holiday scheduling feature. (The wildcard character “*” in the above table could be any number between 1 and 16.) Whenever a holiday period occurs, the controller uses the Holiday Schedule start and stop time for the period. For example, assume that

Christmas Eve occurs on a Thursday. The building is shut down on both Christmas Eve and Christmas Day, but operates normally on the weekend. This holiday period would be scheduled by setting the Holiday Schedule to “00:00-00:00” and setting the Holiday Period to “Dec 24 - Dec 25.”

If any of the 16 holiday periods are not required, the Holiday

Period is set to “N/A - N/A.”

One Event Scheduling

Table 18: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Parameter Name

One Event

Beg= mmm dd @ hh:mm

End= mmm dd @ hh:mm

One Event Beginning

Date/Time

One Event Ending

Date/Time

The unit can be scheduled to operate during a specified period by using the one event scheduling feature. During the specified period defined by the One Event Beginning

OM 138 49

Date/Time and One Event Ending Date/Time parameters the unit starts up and runs continuously regardless of any other time scheduling functions. For example, assume that a space served by the unit is occupied for a special event on March

12 from 5:00 p.m. to 10:00 p.m. when the normal time scheduling has the unit shut off after 4:00 p.m. on that date.

This event can be accounted for by setting the One Event

Beginning Date/Time to “Mar 12 @ 17:00” and the One

Event Ending Date/Time to “Mar 12 @ 22:00.” If a oneevent schedule is not required, the One Event Beginning

Date/Time and One Event Ending Date/Time parameters are both set to “N/A.”

Optimal Start

The optimal start function can only be used with the unit internal time schedule or a network supplied time schedule that indicates “time-to-occupancy”. When the Optimal Start

Flag is set to “Yes”, the controller calculates an early start time before each normally scheduled start. The controller uses the start history, outdoor air temperature, and space temperature to determine when the unit should start. The unit may be started by the optimal start function up to four hours before the scheduled start time.

If the Ctrl Temp= parameter, which is the temperature input selected by the CtrlTemp Src= parameter, is below the Effective Heating Enable Set Point by more than half the Heating

Enable Deadband setting, optimal start operation is based on the optimal start heating parameters. If the Ctrl Temp= value is above the Effective Cooling Enable Set Point by more than half Cooling Enable Deadband setting, optimal start operation is based on the optimal start cooling parameters.

Unit startup occurs at the scheduled start time if the Ctrl

Temp= value is in between these limits.

Table 19: Programmable Parameter

Menu Name

Zone Cooling

Zone Heating

Optimal Start

Keypad/Display ID

Item Name

Eff Clg Spt= 75.0 ºF

Clg Deadband= 1.0 ºF

Eff Htg Spt= 75.0 ºF

Htg Deadband= 1.0 ºF

Optimal Start= No

Auto Update= Yes

Htg Rate= 0.4 ºF/min

Htg OAT= 35.0 ºF

Htg Zero OAT = 0 ºF

Clg Rate= 0.4 ºF/min

Clg OAT= 85.0 ºF

Clg Zero OAT= 100 º F

Parameter Name

Effective Cooling Enable Set Point

Cooling Enable Deadband

Effective Heating Enable Set Point

Heating Enable Deadband

Optimal Start Flag

Automatic Update Flag

Heating Rate

Heating Outdoor Air Temperature

Heating Outdoor Air Temperature Zero

Cooling Rate

Cooling Outdoor Air Temperature

Cooling Outdoor Air Temperature Zero

When heating is required, a “heating rate” that varies with the outdoor air temperature is calculated using the formula:

Calculated Heating Rate = Heating Rate ×

The minutes before occupancy are calculated based on the following formula:

Minutes Before Occupancy =

Calculated Heating Rate

When cooling is required, a “cooling rate” that varies with the outdoor air temperature is calculated using the formula:

Calculated Cooling Rate = Cooling Rate ×

The minutes before occupancy are on the following formula:

Minutes Before Occupancy =

If the Automatic Update Flag is set to “Yes”, the controller revises the optimal start parameters after each start in which

Calculated Cooling Rate they are used and the temperature change is significant.

50 OM 138

External Time Scheduling

An external time clock can be used to schedule unit operation. This is accomplished by a field supplied external time clock signal in the form of a set of dry contacts wired across terminals 101 and 102 on the unit field terminal block TB2

(binary input MCB-BI1). In this case, all internal daily schedules should be set to “00:00-00:00” (default setting).

For details on how to connect an external time clock, refer to

“Field Wiring” in IM 696, MicroTech Applied Rooftop Unit

Controller .

Network Time Scheduling

A network time schedule can be used to operate the unit. In this case, all internal daily schedules should be set to “00:00-

00:00” (default setting). Scheduling a unit via a network signal is supported through optional communication modules

(Ethernet-BACnet, MSTP-BACnet and LonWorks).

Alarm Monitoring

About Alarms

The MicroTech II Applied Rooftop Unit Controller is programmed to monitor the unit for alarm conditions. Alarm conditions are categorized in three types: “faults”, “problems”, and “warnings.” In general, “faults” are more serious than “problems” and “problems” more serious that “warnings.” Therefore, “faults” are assigned a higher priority than

“problems” and “problems” a higher priority than “warnings.” Within the three types, the alarms are prioritized.

Some alarms require manual clearing and some are cleared

automatically. Table 20 summarizes all alarms, listing them

by type and priority, and listing the required clearing method.

If an alarm condition occurs, the controller displays a message and executes the appropriate action to make the unit fail-safe. The controller displays a local message on the unit keypad/display and a remote indication on a Remote Alarm

Output (binary output MCB-BO4) wired to terminals for

field connection. For the meaning of each alarm, see “Alarm

Control” on page 91.

Table 20: Unit Alarms

Alarm Type

Fault

Alarm Message

Freeze

Smoke

Space Sensor

Return Sensor

Disch Sensor

Hi Return Tmp

Hi Disch Tmp

Lo Disch Tmp

Fan Fail

OA Dmpr Stuck

Indication

Freezestat condition while SAF on

Smoke detected by SAF and/or RAF smoke detector

Space temp sensor failure when CtrlTemp Src= parameter is set to “Space”

RAT sensor failure

DAT sensor failure

RAT exceeded the Hi Return Tmp setting

DAT exceeded the Hi Disch Tmp setting

DAT fell below the Lo Disch Tmp setting

Airflow not sensed by PC7 after SAF was started

OA Dampers < 50% open after Startup (100% OA units only)

Alarm Reset

Manual

Manual a

Manual

Manual

Manual

Manual

Manual

Manual

Manual

Manual

OM 138 51

Table 20: Unit Alarms (Continued)

Alarm Type

Problem

Warning

Alarm Message

Freeze

OAT Sensor

Space Sensor

Return Sensor

Ent Fan Sensor

Lo Airflow

Heat Fail

Hi Pres-Ckt1

Hi Pres-Ckt2

Lo Pres-Ckt1

Lo Pres-Ckt2

Frost-Ckt1 d

Frost-Ckt2 d

Comp #1 Alm

Comp #2 Alm

Comp #3 Alm

Comp #4 Alm

PumpDown-Ckt1 LP1 still closed 180 seconds into ckt #1 pumpdown operation

PumpDown-Ckt2 LP2 still closed 180 seconds into ckt #2 pumpdown operation

Ckt1 Clg Ena

Ckt2 Clg Ena

Clg enable input to CCB1 off when cooling was on

Clg enable input to CCB2 off when cooling was on

GenC Clg Ena

HtgB Htg Ena

Clg enable input to CCB1 off when cooling was on

Htg enable input to EHB1 off when heating was on

Ckt1 Comm Fail Comm failure occurred between MCB and CCB1

Ckt2 Comm Fail Comm failure occurred between MCB and CCB2

GenC Comm Fail Comm failure occurred between MCB and CCB1

HtgB Comm Fail Comm failure occurred between MCB and EHB1

ERecB Comm Fail Comm failure occurred between MCB and ERB1

OA Dmpr Stuck

OA dampers not at 0% when unit off or not at 100% during mechanical cooling while

OA Ambient= parameter indicates “Low”

Airflow Switch

Dirty Filter

Dirty FnlFltr

Ckt1 H/W

Ckt2 H/W

GenC H/W

HtgB H/W

Freezestat tripped while SAF was off

OAT sensor failure when CtrlTemp Src= parameter not set to “OAT”

Space temp sensor failure on unit with RAT sensor

RAT sensor failure CtrlTemp Src= parameter not set to “Return”

EFT sensor failure

Excessive temperature rise sensed across heat section on single stage heat unit

Gas furnace safety lockout condition occurred

HP1 or HP3 open indicating ckt # 1 high refrigerant pressure

HP2 or HP4 open indicating ckt # 2 high refrigerant pressure

LP1 remained opened after ckt #1 solenoid valve open

LP2 remained opened after ckt #2 solenoid valve open

Evaporator coil frost condition occurred on ckt #1

Evaporator coil frost condition occurred on ckt #2

Comp #1 off on low oil pressure (OP1) or motor protector (MP1)

Comp #2 off on low oil pressure (OP2) or motor protector (MP2)

Comp #3 off on low oil pressure (OP3) or motor protector (MP3)

Comp #4 off on low oil pressure (OP4) or motor protector (MP4)

PC7 sensed airflow when unit was off

Indication

Pressure drop across first filter section exceeded the setting of PC5

Pressure drop across final filter section exceeded the setting of PC6

Clg enable input to CCB1 on when cooling off

Clg enable input to CCB2 on when cooling off

Clg enable input to CCB1 on when cooling off

Htg enable input to EHB1 on when heating off

Manual

Manual

Manual

Manual

Manual

Manual

Manual

Manual a.

The SAF and RAF smoke detectors must be manually reset after tripping. This can be accomplish be cycling control system power (S1 Switch).

b.

A manual reset of the flame safeguard control FSG is required before the Heat Fail problem clears.

c.

Manual clearing is required if this alarm occurs three times within a 24-hour period (2:00 a.m. of one day until 2:00 a.m. of the next). The oil pressure safety devices require a manual reset on the device.

d.

Not applicable on units equipped with hot gas bypass.

Alarm Reset

Automatic

Automatic

Automatic

Automatic

Automatic

Manual

Automatic b

Manual

Manual

Automatic c

Automatic c

Automatic c

Automatic c

Automatic c

Automatic c

Automatic c

Automatic c

Manual

Manual

Manual

Manual

Manual

Manual

Automatic

Automatic

Automatic

Automatic

Automatic

Remote Alarm Indication

The MicroTech II control system includes a Remote Alarm

Output (MCB-B04) to provide remote indication of alarm conditions. Under normal (no active alarm) conditions, the

Remote Alarm Output (MCB-B04) is closed. The LED associated with the alarm output indicates the state of the output:

On indicates MCB-B04 is closed, and off indicates MCB-

B04 is open. The Remote Alarm Output can be connected to some type of field-supplied annunciator. If an alarm occurs, the Remote Alarm Output condition changes to either an

“off” or “blinking” state. Each possible alarm condition can be set up to cause the output to either blink rapidly, blink slowly, turn off or remain on (no remote indication of the

alarm). Refer to “Configuring Remote Alarm Output” on page 54.

Note: If there are multiple active alarms, only the highest priority alarm affects this output. This is always the alarm indicated by the Active Alarm 1 menu. Refer to “Remote Alarm Output” in the “Field Wiring” section of IM 696, MicroTech Applied Rooftop Unit

Controller .

52 OM 138

Figure 6: Active and Previous Alarm Menu Display

Menu Line

Alarm Name Item Line

Alarm Type Item Line

Alarm Date/Time Item Line

Active Alarm 1

Dirty Filter

Warning-Active

12-Mar-00 04:50:49

Previous Alarm 1

Dirty Filter

Warning-Clear

12-Mar-00 05:15:34

Local Alarm Indication (Keypad/Display)

Alarm information is provided via the unit keypad/display by four “active” and eight “previous” alarm menus.

Up to four active alarms are displayed in the Active Alarm 1,

Active Alarm 2, Active Alarm 3, and Active Alarm 4 menus.

The highest priority active alarm is displayed in the Active

Alarm 1 menu, the second highest priority active alarm in the Active Alarm 2, the third highest priority active alarm in the Active Alarm 3 and the forth highest priority active alarm in the Active Alarm 4 menu. If it happens that there are more than four active alarms, the additional alarms do not appear until one of these four active alarms are cleared.

When an active alarm is cleared the remaining active alarms are resorted such that the highest priority active alarm remaining is displayed in Active Alarm 1, the second highest priority active alarm remaining is displayed in Active Alarm

2 and so forth. Figure 6 shows the typical display of an

active alarm menu. The first line of the display is the menu line, the second line indicates the alarm name, the third line indicates the alarm “type” (fault, problem, or warning) and the forth line indicates the date and time the alarm occurred.

Whenever there is an active alarm, a red alarm LED on the unit keypad turns on. If there are no active alarms, this LED remains off.

When an active alarm is cleared, it is stored in the Previous

Alarm 1 menu. Any alarm that might be in the Previous

Alarm 1 menu is moved to the Previous Alarm 2 menu, any alarm that might be in the Previous Alarm 2 menu is moved to the Previous Alarm 3 menu and so forth. Any alarm that might be in the Previous Alarm 8 menu is permanently

remove from the keypad. Figure 6 shows a typical display of

a previous alarm menu. The first line of the display is the menu line, the second line indicates the alarm name, the third line indicates the alarm “type” (fault, problem, or warning) and the forth line indicates the date and time the alarm occurred.

Displaying Alarms

Active Alarms. When an active alarm exists the red LED on the keypad is on. The active alarm or alarms can be viewed as follows:

1. Pressing the Alarm key while the red LED on the keypad is on changes the display to the Active Alarm 1 menu.

2. Pressing the Right Arrow key changes the display to the

Active Alarm 2 menu. Pressing the Right Arrow key again changes the display to the Active Alarm 3 menu.

Pressing the Right Arrow key again changes the display to the Active Alarm 4 menu.

3. Pressing the Left Arrow key changes the display back to the Active Alarm 3 menu. Repeating this key two more times changes the display back to the Active Alarm 1 menu.

Previous Alarm. When active alarms are cleared, they are stored in the previous alarm menus. The previous alarm menus can be viewed as follows:

1. Pressing the Back/Cancel key changes the display to back to the main menu if not already there.

2. Assuming the blinking cursor is positioned on the System Summary menu, pressing the Down Arrow (-) key six times changes the cursor position to the Previous

Alarms menu.

3. Pressing the Enter/Save key changes the display to the

Previous Alarm 1 menu.

4. Pressing the Right Arrow key changes the display to the

Previous Alarm 2 menu. Pressing the Right Arrow key again changes the display to the Previous Alarm 3

OM 138 53

menu. Pressing the Right Arrow key five more times changes the display to the Previous Alarm 8 menu.

5. Pressing the Left Arrow key changes the display back to the Active Alarm 7 menu. Repeating this six more times changes the display back to the Previous Alarm 1 menu.

Clearing Alarms. Before any active alarm is cleared, the alarm conditions that caused it must have returned to normal.

When the alarm conditions are no longer present, an active alarm may be cleared either automatically or manually.

Note: Some of the safety devices that detect alarm condition require a manual reset at the device before the

alarm can be cleared. Refer to Table 20 on page 51

for listing of possible alarms and to determine whether an alarm is manual or automatic reset.

An automatic reset active alarm immediately clears when the alarm conditions that caused it disappear. A manual reset active alarm is cleared using the keypad/display as follows.

1. The active alarm to be cleared is first displayed. Refer to

“Displaying Alarms” on page 53.

controller. This clears the active alarm and returns the unit to normal operation if no other alarms are active.

Remote Alarm Clearing

Although it is always recommended that active alarms be cleared at the unit via the keypad/display, there are other methods that effectively clear active alarms. Three such methods are described in the following sections.

Unit System Switch (S1)

Cycling the main controller system switch (S1) located in the unit main control panel has the effect of clearing the active alarm menus. The disadvantage of clearing alarms in this manor is that the active alarm data is not placed into the previous alarm buffer and alarm information is lost.

Note: Turning off the unit power disconnect switch has the same effect.

Manual Unit Enable/Disable Input

Disabling the unit via the manual unit enable/disable input

(this occurs when a field supplied and installed switch across terminals 101 and 104 on the unit field terminal block (TB2) is changed from the on (closed) to off (open) position. Refer to the “Manual Unit Enable/Disable” section of IM 696,

MicroTech Applied Rooftop Unit Controller .

Network Signal

The active alarms can be cleared via a network signal through optional communication modules (including Ethernet-BACnet, MSTP-BACnet and LonWorks).

Configuring Remote Alarm Output

2. Pressing the Clear Alarm key while the active alarm to be cleared is in the display sends a clear command to the

Table 21: Programmable Parameters

Keypad/Display ID

Menu Name

Alarm Out Faults

Item Name

Freeze= Fast

Smoke= Fast

Space Sensor= Fast

Return Sensor= Fast

Disch Sensor= Fast

Hi Return Tmp= Fast

Hi Disch Tmp= Fast

Lo Disch Tmp= Fast

Fan Fail= Fast

OA Dmpr Stuck= Fast

Parameter Name

Freeze Fault Remote Output Setup

Smoke Fault Remote Output Setup

Space Sensor Fault Remote Output Setup

Return Sensor Fault Remote Output Setup

Disch Sensor Fault Remote Output Setup

Hi Return Tmp Fault Remote Output Setup

Hi Disch Tmp Fault Remote Output Setup

Lo Disch Tmp Fault Remote Output Setup

Fan Fail Fault Remote Output Setup

OA Dmpr Stuck Fault Remote Output Setup

54 OM 138

Table 21: Programmable Parameters (Continued)

Keypad/Display ID

Menu Name

Alarm Out Problems

Alarm Out Warnings

Parameter Name

Item Name

Freeze= Slow

OAT Sensor= Slow

Space Sensor= Slow

Return Sensor= Slow

Ent Fan Sensor= Slow

Lo Airflow= Slow

Heat Fail= Slow

Hi Pres-Ckt1= Slow

Hi Pres-Ckt2= Slow

Lo Pres-Ckt1= Slow

Lo Pres-Ckt2= Slow

Frost-Ckt1= Slow

Frost-Ckt2= Slow

Comp #1 Alm= Slow

Comp #2 Alm= Slow

Comp #3 Alm= Slow

Freeze Problem Remote Output Setup

OAT Sensor Problem Remote Output Setup

Space Sensor Problem Remote Output Setup

Return Sensor Problem Remote Output Setup

Ent Fan Sensor Problem Remote Output Setup

Lo Airflow Problem Remote Output Setup

Heat Fail Problem Remote Output Setup

Hi Pres-Ckt1 Problem Remote Output Setup

Hi Pres-Ckt2 Problem Remote Output Setup

Lo Pres-Ckt1 Problem Remote Output Setup

Lo Pres-Ckt2 Problem Remote Output Setup

Frost-Ckt1 Problem Remote Output Setup

Frost-Ckt2 Problem Remote Output Setup

Comp #1 Alm Problem Remote Output Setup

Comp #2 Alm Problem Remote Output Setup

Comp #3 Alm Problem Remote Output Setup

Comp #4 Alm= Slow

PumpDown-Ckt1= Slow

PumpDown-Ckt2= Slow

Ckt1 Clg Ena= Slow

Ckt2 Clg Ena= Slow

GenC Clg Ena= Slow

HtgB Htg Ena= Slow

Ckt1 Comm Fail= Slow

Comp #4 Alm Problem Remote Output Setup

PumpDown-Ckt1 Problem Remote Output Setup

PumpDown-Ckt2 Problem Remote Output Setup

Ckt1 Clg Ena Problem Remote Output Setup

Ckt2 Clg Ena Problem Remote Output Setup

GenC Clg Ena Problem Remote Output Setup

HtgB Htg Ena Problem Remote Output Setup

Ckt1 Comm Fail Problem Remote Output Setup

Ckt2 Comm Fail= Slow Ckt2 Comm Fail Problem Remote Output Setup

GenC Comm Fail= Slow GenC Comm Fail Problem Remote Output Setup

HtgB Comm Fail= Slow HtgB Comm Fail Problem Remote Output Setup

ERecB Comm Fail= Slow ERecB Comm Fail Problem Remote Output Setup

OA Dmpr Stuck= Off

Airflow Switch= Off

Dirty Filter= Off

Dirty FnlFltr= Off

OA Dmpr Stuck Warning Remote Output Setup

Airflow Switch Warning Remote Output Setup

Dirty Filter Warning Remote Output Setup

Dirty FnlFltr Warning Remote Output Setup

Ckt1 H/W= Off

Ckt2 H/W= Off

GenC H/W= Off

HtgB H/W= Off

Ckt1 H/W Warning Remote Output Setup

Ckt2 H/W Warning Remote Output Setup

GenC H/W Warning Remote Output Setup

HtgB H/W Warning Remote Output Setup

Each possible alarm condition can be configured to cause the

Remote Alarm Output (MCB-B04) to blink rapidly, blink slowly, turn off, or remain on (no remote indication of the alarm). This allows the action of the Remote Alarm Output to be “tailored” according to the specific requirements of the application. When there are no active alarms within the controller the Remote Alarm Output is “on” continuously. If an alarm output setup parameter is set to “Slow”, the Remote

Alarm Output cycles on and off at a slow rate when the alarm occurs. If an alarm output setup parameter is set to

“Fast”, the Remote Alarm Output cycles on and off at a rapid rate when the alarm occurs. If an alarm output setup parameter is set to “Off”, the Remote Alarm Output turns off when the alarm occurs. If an alarm output setup parameter is set to

“On”, the Remote Alarm Output remains on when the alarm occurs.

For example, it may be necessary that only alarms that shut a unit off completely (faults) be indicated remotely. In this case all of the “fault” alarms are set to “Slow”, “Fast” or

“Off.” All others are set to “On.”

Refer to “Remote Alarm Output” in the “Field Wiring” section of IM 696, MicroTech Applied Rooftop Unit Controller .

OM 138 55

Setting Alarm Limits

Table 22: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Alarm Limits

Parameter Name

Hi Disch Alm= 170 ºF

Lo Disch Alm= 40 ºF

Hi Return Alm= 120 ºF

High Discharge Air Temperature Alarm Limit

Lo Discharge Air Temperature Alarm Limit

High Return Air Temperature Alarm Limit

Three of the alarm faults have adjustable limits that are used to trigger the alarm. These are the Hi Disch Tmp, Lo Disch

Tmp and Hi Return Tmp faults. Although the default settings should be suitable for most applications, the alarm limits can be set as necessary via the unit keypad/display. The default settings are shown in the table above.

Unit Configuration/Service

Parameters

Calibrate Mode

Table 23: Programmable Parameters

Keypad/Display ID

Parameter Name

Menu Name Item Name

Unit Configuration Calibrate Mode= No Calibrate Mode Flag

Calibrate Mode is a special service mode used to calibrate control actuator feedback signals and to zero static pressure sensor inputs. When the Calibrate Mode Flag is set to “Yes”, the position feedback potentiometers on the outdoor air damper, return or exhaust fan inlet vane, modulating cooling valve and modulating heating valve actuators are automatically calibrated. Any unit static pressure transducers are also calibrated (or zeroed). The following is a description of the

Calibrate Mode procedure.

When the Calibrate Mode Flag is set to “Yes”, the Occupancy= parameter is overridden and is set to “Unocc” and accordingly the unit shuts off. When the unit is off the outdoor air dampers, return or exhaust vanes, modulating cooling valve, and modulating heating valve actuators are driven to the 100% open position for three minutes. After three minutes, the controller records the analog input feedback values from the actuators as equivalent to their fully open positions. The controller then drives the actuators to the opposite or fully “closed” position for three minutes. After three minutes, the controller records the analog input feedback values from the actuators as equivalent to their fully closed positions. The controller also records the analog input voltage signals from all connected pressure transducers as equivalent to 0 “W.C.

Note: It is best to calibrate the unit with all the sensing tubing to the static pressure sensors disconnected.

This assures that the sensors are truly seeing 0 “WC when calibrated.

After the Calibrate Mode procedure is complete, the Ctrl

Mode= parameter is set to “Off” which means the unit remains off until the Ctrl Mode= parameter is set to some-

thing other than “Off” as described in “Auto/Manual Operation” on page 45

Note: If the Calibrate Mode Flag is set to “Yes” while the

Manual Control= parameter in the Manual Control menu is set to “Yes”, the Manual Control= parameter reverts to “No.”

Zone (Space) Temperature Sensor

Table 24: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Parameter Name

Unit Configuration Space Sensor= Yes

Space Sensor

Present Flag

An optional zone (space) temperature sensor can be installed in the field and wired to the unit. When the optional sensor is installed, the Space Sensor Present Flag should be set to

“Yes.” When the optional sensor is not installed, the Space

Sensor Present Flag must be set to “No” to deactivate alarm functions associated with an open circuit at the space temperature analog input to the controller. The factory setting for the Space Sensor Present Flag is “Yes.”

The optional space temperature sensor is required to take advantage of the MicroTech II unoccupied heating (night setback) and cooling (night setup and purge) functions.

These functions are disabled when the Space Sensor Present

Flag is set to “No.” Also, optimal start and the option of setting the CtrlTemp Src= parameter to “Space” are not available when the Space Sensor Present Flag is set to “No.”

Refer to “Zone Temperature Sensor Packages” in the “Field

Wiring” section of IM 696, MicroTech Applied Rooftop Unit

Controller .

56 OM 138

Miscellaneous Service Parameters

Table 25: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Parameter Name

Unit Configuration

EFT Sensor=

2nd P Sensor= None

RF/EF Ctrl= Tracking

Rem RF/EF Cap=

25%

Eng Units=

No

English

Entering Fan Sensor

Present Flag

Second Pressure

Sensor Present Flag

Return/Exhaust Fan

Capacity Control

Flag

Remote

Return/Exhaust Fan

Capacity Set Point

Engineering Units

Control Flag

The Unit Configuration menu contains several miscellaneous control parameters as listed in the table above. These parameters are generally the type that are set at the factory and might be adjusted when the equipment is started up and generally do not required further adjustment. The following sections describe these parameters.

EFT Sensor

When a unit is equipped with gas or electric heat, it is equipped with an entering fan temperature (EFT) sensor.

This sensor senses the temperature of the air entering the discharge air fan and is compared to the unit discharge air temperature to obtain an indication of the temperature rise across the gas or electric heat section. The controller uses this information to assure the heat rise across the heater does not exceed the safe limit for the heat exchanger. When the entering fan temperature sensor is installed the Entering Fan Sensor Present Flag is set to “Yes.” When the entering fan temperature sensor is not installed the Entering Fan Sensor

Present Flag is set to “No.” Setting this parameter to “No” disables the alarm function associated with an open circuit at the EFT temperature sensor input.

2nd P Sensor

The Second Pressure Sensor Present Flag is used to indicate whether or not an optional building static pressure sensor is installed in the “second sensor” input location.

Note: When the unit is equipped for zone (or space comfort) control, the “second sensor” input location is design only for a building static pressure input.

There is no “first sensor” location.

The Second Pressure Sensor Present Flag should be set to

“None” when the Return/Exhaust Fan Capacity Control Flag is set to “None” or “Position”. When the Return/Exhaust Fan

Capacity Control Flag is set to “Bldg”, the Second Pressure

Sensor Present Flag automatically reverts to “Bldg”. For detailed information regarding return fan capacity control,

refer to “Return Fan Capacity Control” on page 88.

RF/EF Ctrl

The Return/Exhaust Fan Capacity Control Flag is used to select the type of return or exhaust fan capacity control, if any, to be used. When the unit is not equipped with return fan vanes or a VFD, the Return/Exhaust Fan Capacity Control Flag should be set to “None”. When the unit is equipped with return fan vanes or a VFD, the Return/Exhaust Fan

Capacity Control Flag can either be set to “Bldg” or “Position”.When the Return/Exhaust Fan Capacity Control Flag is set to “Bldg”, the return or exhaust fan capacity is controlled to maintain the building static pressure at a building static pressure set point. When the Return/Exhaust Fan Capacity

Control Flag is set to “Position”, then the return or exhaust fan capacity is controlled to the Remote Return/Exhaust Fan

Capacity Set Point. For detailed information regarding return

or exhaust fan capacity control, refer to“Return Fan Capacity

Control” on page 88 or “Energy Recovery” on page 86.

Rem RF/EF Cap

The the return or exhaust fan capacity is controlled to maintain the Remote Return/Exhaust Fan Capacity Set Point when the Return/Exhaust Fan Capacity Control Flag is set to

“Position”. The Remote Return/Exhaust Fan Capacity Set

Point is normally adjusted via a network signal but can also be adjusted via the keypad/display in the absence of a network connection to the parameter. For detailed information regarding return or exhaust fan capacity control, refer

to“Return Fan Capacity Control” on page 88 or “Energy

Recovery” on page 86.

Eng Units

The Engineering Units Control Flag is used to select the system of engineering units used for displaying data on the keypad. If this parameter is set to “English”, the keypad data is displayed in inch-pound (I-P) units. If this parameter is set to

“SI Canada”, the keypad data is displayed in the International System of Units (SI) used in Canada. If this parameter is set to “SI Europe”, the keypad data is displayed in the

International System of Units (SI) used in Europe.

OM 138 57

Control Timer Settings

Table 26: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Service= 0 min

Recirculate= 3 min

Timer Settings

Low DAT= 3 min

Max MWU= 90 min

Bypass= 120 min

Start Init= 120 min

Min Exh On= 120 sec

Min Exh Off= 120 sec

Parameter Name

Fast Service Timer

Recirculate State

Timer

Low Discharge Temperature Ignore Timer

Maximum Morning

Warm-up Timer

Bypass Time Increment

Startup Initialization

Timer

Minimum Exhaust

Fan On Timer

Minimum Exhaust

Fan Off Timer

Several MicroTech II internal control timers can be adjusted via the keypad/display Timer Settings menu. The following sections describe these timers.

Service

Many of the internal control timers can be temporarily sped up by using the Fast Service Timer. When set to a time value, the Fast Service Timer begins counting down. While this parameter is counting down the following normal unit timers are set to 20 seconds: l l l l

Startup Initialization Timer

Post Heat Timer

Cooling Interstage Timer

Heating Interstage Timer

These timers return to their normal settings if the Fast Service Timer is manually set to 0 or when it counts down to 0.

Caution: This fast timers feature is meant to be used only by a knowledgeable service technician to facilitate testing the unit.

Recirculate

The Recirculate State Timer defines the duration of the

Recirc operating state applicable on units with return air

(100% OA units have no Recirc operating state). Whenever a unit with return air is started or restarted, it always transitions through a “start sequence” which includes the Startup, followed by the Recirc operating state. During the Recirc operating state, the unit fans run while the outdoor air dampers remain closed. Heating and cooling operation are disabled during the Recirc operating state to allow the “system” air temperature conditions to equalize before temperature control begins. Once in the Recirc operating state, the unit remains there until the Recirculate State Timer expires.

Low DAT

The Low Discharge Temperature Ignore Timer sets the duration of a time period after unit start up during which the Lo

Disch Tmp fault is ignored. This may be particularly important in colder climates when a unit has been off for a significant time period during which the unit, including the discharge air temperature sensor, has become very cold. This time period allows the unit to run long enough to warm the discharge sensor above the alarm limit, preventing nuisance unit alarm shutdown. For detailed information regarding the

Lo Disch Tmp fault refer to “Alarm Control” on page 91.

Max MWU

The Maximum Morning Warm-up Timer sets a maximum duration for the MWU operating state applicable on units with return air (100% OA units have no MWU operating state). Whenever a unit with return air leaves the Recirc operating state, it enters the MWU operating state if the Ctrl

Temp= parameter value is cold. The unit remains in the

MWU operating state until either the Ctrl Temp= parameter value warms up or until the Maximum Morning Warm-up

Timer expires. For detailed information regarding MWU

operation, refer to “Heating: Multistage” on page 78, or

“Heating: Modulating” on page 80, as applicable.

Bypass

The Bypass Time Increment sets the time period for which the unit operates each time the tenant override button on the optional space temperature sensor is pressed or the Occ

Mode= parameter is set to “Bypass.” The Bypass Time= parameter in the Occupancy menu is set or reset to this value when the tenant override button is pressed or the Occ Mode= parameter is set to “Bypass.” The unit then operates until the

Bypass Timer= parameter counts down to 0. For detailed

information regarding bypass operation, refer to “Bypass

Time (Tenant Override)” on page 48.

Start Init

The Startup Initialization Timer defines the duration of the

Startup operating state. When a unit is started or restarted, it always transitions through a “start sequence” that begins with the Startup operating state. During the Startup operating state, the unit fans remain off and heating and cooling are disabled. On units equipped with return air, the outdoor air damper actuator is driven closed. On units equipped with

100% outdoor air hoods, the outdoor air dampers are driven fully open. Return fan inlet vane actuators (if present) are

driven to a 17% minimum startup position. Refer to “Operating States and Sequences” on page 61.

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Manual Output Control

Table 27: Programmable Parameters

Keypad/Display ID

Menu Name Item Name

Parameter Name

Manual Control

Manual Control = No

Discharge Fan = Off

RF/EF Fan = Off

Fan Operation = Off

Alarm = Normal

OA Damper = Auto

Mod Cooling = Auto

Mod Heating = Auto

RF/EF Vanes = Auto

RF/EF VFD = Auto

Manual Control Mode

Flag

Manual Discharge

Fan Control Flag

Manual

Return/Exhaust Fan

Control Flag

Manual Fan Operation

Output Control Flag

Manual Remote Alarm

Output Control Flag

Manual OA Damper

Control Flag

Manual Modulating

Cooling Valve Control

Flag

Manual Modulating

Heating Valve Control

Flag

Manual

Return/Exhaust Vane

Actuator Control Flag

Manual

Return/Exhaust VFD

Control Flag

The Manual Control menu is a special service menu that can be used to control many of the outputs on the main control board (MCB) in a manual mode. This can be used to test the operation of the various devices controlled by the outputs.

This is very useful in determining whether a problem is the result of a wiring problem or defective device rather than a problem within the main controller.

Manual Control

The Manual Control Mode Flag is used to turn the manual control mode of operation on and off. When this parameter is set to “No” the unit operates normally. When this parameter is set to “Yes” normal operation of the control outputs is overridden and the condition of each output is defined by setting the remaining items within the Manual Control menu.

All alarms are inactive when the Manual Control Mode Flag is set to “Yes”.

Note: If the Calibrate Mode= parameter in the Unit Configuration menu is set to “Yes” while the Manual

Control Mode Flag is set to “Yes”, the Manual Control Mode Flag reverts to “No.”

Discharge Fan

The Manual Discharge Fan Control Flag is used to manually turn the discharge air fan on and off. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to

“On” the discharge air fan is turned on. When the Manual

Control Mode Flag is set to “Yes” and this parameter is set to

“Off” the discharge air fan is turned off.

RF/EF Fan

The Manual Return/Exhaust Fan Control Flag is used to manually turn the return or exhaust fan on and off. When the

Manual Control Mode Flag is set to “Yes” and this parameter is set to “On” the return or exhaust fan is turned on. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Off” the return or exhaust fan is turned off.

Fan Operation

The Manual Fan Operation Output Control Flag is used to manually turn the Fan Operation Output (MCB-BO3) on and off. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “On” the Fan Operation Output is turned on. When the Manual Control Mode Flag is set to

“Yes” and this parameter is set to “Off” the Fan Operation

Output is turned off. For detailed information regarding the

Fan Operation Output, refer to “Fan Operation Output” in the “Field Wiring” section of IM 696, MicroTech Applied

Rooftop Unit Controller .

Alarm

The Manual Remote Alarm Output Control Flag is used to manually turn the Remote Alarm Output (MCB-BO4) on and off. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Normal” the Remote Alarm

Output is turned on. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Alarm” the Remote

Alarm Output is turned off. For detailed information regarding the Remote Alarm Output, refer to “Remote Alarm Output” in the “Field Wiring” section of IM 696, MicroTech

Applied Rooftop Unit Controller .

OA Damper

The Manual OA Damper Control Flag is used to manually drive the outdoor air dampers open and closed. When the

Manual Control Mode Flag is set to “Yes” and this parameter is set to “Open” the open outdoor damper output (MCB-

BO6) is turned on and the outdoor air dampers stroke open continuously. When the Manual Control Mode Flag is set to

“Yes” and this parameter is set to “Close” the close outdoor damper output (MCB-BO5) is turned on and the outdoor air dampers stroke closed continuously. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to

“Auto” the open and close outdoor damper outputs remain off and the outdoor air dampers remain at their current position.

Mod Cooling

The Manual Modulating Cooling Valve Control Flag is used to manually drive the modulating cooling valve open and closed. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Open” the open cooling valve output (MCB-BO8) is turned on and the cooling valve strokes open continuously. When the Manual Control Mode

Flag is set to “Yes” and this parameter is set to “Close” the

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close cooling valve output (MCB-BO7) is turned on and the cooling valve strokes closed continuously. When the Manual

Control Mode Flag is set to “Yes” and this parameter is set to

“Auto” the open and close cooling valve outputs remain off and the cooling valve remains at its current position.

Mod Heating

The Manual Modulating Heating Valve Control Flag is used to manually drive the modulating heating valve open and closed. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Open” the open heating valve output (MCB-BO10) is turned on and the heating valve strokes open continuously. When the Manual Control Mode

Flag is set to “Yes” and this parameter is set to “Close” the close heating valve output (MCB-BO9) is turned on and the heating valve strokes closed continuously. When the Manual

Control Mode Flag is set to “Yes” and this parameter is set to

“Auto” the open and close heating valve outputs remain off and the heating valve remains at its current position.

RF/EF Vanes

The Manual Return/Exhaust Vane Actuator Control Flag is used to manually drive the return air or exhaust fan inlet vanes open and closed. When the Manual Control Mode

Flag is set to “Yes” and this parameter is set to “Open” the open return or exhaust inlet vanes output (MCB-BO16) is turned on and the vanes stroke open continuously. When the

Manual Control Mode Flag is set to “Yes” and this parameter is set to “Close” the close return or exhaust inlet vanes output (MCB-BO15) is turned on and the vanes are stroked closed continuously. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Auto” the open and close return or exhaust inlet vanes outputs remain off and the vanes remain at their current position.

RF/EF VFD

The Manual Return/Exhaust VFD Control Flag is used to manually increase and decrease the return air or exhaust fan

VFD speed. When the Manual Control Mode Flag is set to

“Yes” and this parameter is set to “Faster” the increase return or exhaust fan VFD speed output (MCB-BO-16) is turned on and the VFD speed increases continuously. When the Manual Control Mode Flag is set to “Yes” and this parameter is set to “Slower” the decrease return or exhaust fan VFD speed output (MCB-BO15) is turned on and the VFD speed decreases continuously. When the Manual Control Mode

Flag is set to “Yes” and this parameter is set to “Auto” the increase and decrease return or exhaust fan VFD speed outputs remain off and the VFD remains at its current position.

60 OM 138