The SZ1022N and SZ1024N are microprocessor-based programmable thermostats designed for conventional multistage heating-and-cooling and heat pump applications, respectively. Both the SZ1022N and SZ1024N feature a 7-day time clock.
The SZ1022N and SZ1024N are designed for wall mounting using two #6 sheet metal screws, either over a horizontally installed 2” x 4” junction box, or directly to block or drywall. For best results, the thermostat should be mounted on an interior wall that reflects the normal room environment, at a height of approximately five feet from the floor. Avoid areas exposed to direct sunlight, unusual heat sources, open doors, and windows, or unventilated locations. If using a remote room sensor, it should be mounted in the manner described above. The thermostat may be mounted in an area that is accessible for adjusting its settings
The SZ1022N and SZ1024N use standard terminal designations for wiring. See the diagram below.
REMOTE SENSOR WIRING
Use 18 AWG shielded twisted-pair grounded at the sensor mounting location. Sensor wiring runs of up to 250 feet are attainable if properly shielded wire is used and the installation environment is free of electrical noise. Sensor wire should be kept at least five feet away from line voltage wiring. The SZ1022N or SZ1024N accepts two remote sensors. Consult the TS Series Temperature Sensor Submittal Datasheet for a complete listing of packaging and application styles. When using TCS/Basys Controls three-wire sensors, use the black and red leads and either clip or twist off the white lead. Make sure that the dip switches are set for the sensors you are using.
The SZ1022N and SZ1024N are powered from 24 VAC +/- 20%.
Caution: Do not connect to 120 VAC.If the wiring is for communications, dedicated power must be used to power the SZ1022N and SZ1024N. Several “S” Series thermostats may be powered from the same transformer, provided that the transformer has sufficient power. (SZ1020 Series thermostats require 8 VA @ 24 VAC.) When the SZ1022N or SZ1024N are used as stand-alone thermostats without communications, the unit transformer may be used to power it. To do this, install a jumper between the “R” and “+24” terminals. The “24-” terminal must then be connected to the common side of the unit transformer
CAUTION
When multiple TCS devices are using a single transformer, the polarity of the power wiring must be maintained because all TCS devices are half-wave rectified and have common return paths.
Note: If using a remote sensor(s), the calibration may need to be adjusted. See the “Checkout & Troubleshooting” section.
SENSOR SELECTION
The dipswitches in the cover (shown above connected with ribbon cable) as well as the program must be set when using the remote room and/or discharge. Use the following guide to determine the dipswitch settings for your application.
The dipswitches in the cover (shown above connected with ribbon cable) must be set in order to lock the user out of the program and/or to set the clock and schedule. Use the guide below to set these dipswitches for your application. Otherwise, user access may be limited with an access code set in programming. (The fan and system switches are enabled or disabled in programming only, and require no dipswitch placement.)
The SZ1022N and SZ1024N may be programmed through the display and keypad, or with a PC. If programming with a PC, the following must be set through the keypad prior to programming:
For more information on programming through the PC, consult your software manual.
PROGRAMMING THROUGH THE KEYPAD
To access the programming screens, press the program setup button. To make changes, use the warmer and cooler keys. Access may be locked out with dipswitches, or an access code may be required
The SZ1022N and SZ1024N clock and schedule may be set through the display and keypad, or with a PC. For more information on programming through the PC, consult the software documentation.
SETTING CLOCK & SCHEDULE THROUGH THE KEYPAD
To access the clock and schedule screens, press the clock setup button. To make changes, use the warmer and cooler keys. For screens that have more than one field to set, use the override key to move to the next field. Access may be locked out with dipswitches, or an access code may be required.
UNOCCUPIED SETBACK
The SZ1022N and SZ1024N operate in either an occupied or unoccupied mode. During the occupied mode, the occupied heating and cooling setpoints will be maintained, and the fan will operate according to its occupied setting. During the unoccupied mode, the unoccupied heating and cooling setpoints will be maintained, and the fan will operate according to its unoccupied setting. The occupied LED will be lit when the unit is operating in the occupied mode. The occupied schedule may be set utilizing the internal time clock or DI3 may be used with an external time clock, whereas when DI3 is closed, the unit is in the occupied mode. The Smart Recovery function is disabled when DI3 is used for the external time clock.
OVERRIDE
A timed override is available on the face or through momentary contacts. The amount of time the unit will be overridden is set from 0 to 255 minutes in the programming. This override only activates when the thermostat is operating in unoccupied mode. Both the software and the service button allow you to view the time remaining in the override mode. If the occupant desires to return the thermostat to unoccupied operation before that time interval is up, they may press the button on the face or the momentary contact again. Continuous override is available through the DI3 contact or the software. If DI3 is set to external override, the unit will be in occupied mode whenever the DI3 contact is closed. When using this option, the timed override may still be activated. The software allows you to override the thermostat by putting the override parameter into the remote mode, and thus disabling the timed override.
SETBACK AND OVERRIDE APPLICATIONS
In most applications, it is desired to maintain a regular schedule, and allow timed override with the button on the face or with a remote momentary contact. To allow a regular schedule, and also automatically override with the use of an occupancy or light sensor, set DI3 to override and set it up so that the contact is closed when you want the override. For applications where a room might not be used on a regular schedule, such as conference rooms, set DI3 to the time clock and close the contact when you want the room occupied, such as with a switch or wind-up timer. If each occupancy period is about the same, (theaters, meetings) another option is to set the DI3 to time clock and use the timed override button to put the unit in occupied mode.
To make the unit always occupied, set DI3 to time clock and short the DI3 terminal to ground.
DISCHARGE AIR TEMPERATURE SENSING
The SZ1022N and SZ1024N accept a remote discharge air sensor (TS1002) for monitoring purposes. (See setup instructions for dipswitch placement for this option.) Choose YES in programming screen #32 only if you are using a discharge air sensor and you want to enable the discharge air temperature high and low limit functions. If NO is chosen, the discharge air is still monitored. When the function is enabled, a HIGH LIMIT and LOW LIMIT are entered in steps #33 and #34. If the HIGH LIMIT is reached, the fan and heating stages will be turned off and will remain off until the discharge air temperature falls 3°below that limit. If the LOW LIMIT is reached, the fan and cooling stages will be turned off and will remain off until the discharge air rises 3° above that limit. When either limit is reached, the service LED will be on until normal operation resumes. The discharge air span is 0 to 150 °F (-17.8 to 65.6 °C).
FAN PROVING
The SZ1022N and SZ1024N allow DI1 to be set for fan proving to protect equipment on fan failure. To utilize this, input a pressure or current switch which tells when the fan is running. If the thermostat closes its fan contact, and the DI1 is not closed after thirty seconds, the system will go to OFF, disabling all outputs, the fan LED will turn off, and the service LED will be lit until the system is manually reset by switching the system to a mode other than OFF.
DI2 SETPOINT SHIFT
The SZ1022N and SZ1024N allow DI2 to be set for setpoint shift for energy demand setback. This is enabled by setting DI2 to the MONITOR mode. A digital contact that closes when setback is needed should be wired into DI2. You may specify the number of degrees such that, when the thermostat is operating in the occupied mode, and DI2 is closed, the heating setpoint will be lowered this number of degrees, and the cooling setpoint will be raised this number of degrees. The fan will continue to operate according to its occupied setting. If you are using DI2 as monitor for another purpose, make sure to set this value to zero.
The SZ1022N will control up to two stages each of heating and cooling, with a fifth stage that may be assigned as a third stage for either. The SZ1024N will control up to two compressor stages, and up to two stages of auxiliary heat. It is recommended that all unused stages be disabled. For each stage, you may specify an offset and a differential value. This allows you to adjust the operation of the thermostat to fit your equipment to the building load. The offset value is the amount away from the setpoint a stage will turn off. By assigning a stage a value other than zero, you “anticipate” that the residual heat or cooling in the duct or the other stages will bring the temperature back to setpoint. In most cases, the first stage is set to zero. The differential value
is the difference between the on and off points. This value depends on the load and on the equipment size. If the equipment is large for the load, you may want to make this value as high as 5 to prevent equipment cycling. If the equipment is small compared to the load, or if tight control is desired, you may want to make this value as low as 1. The fact that the stages are configurable allows unused stages to be set to activate physical alarms if desired. The SZ1022N and SZ1024N also have a P+I option. Without enabling this option, stages turn on and off based on temperature vs. setpoint alone, as described above. By enabling this option, you allow a time factor to be added. This is useful when you are forced to have a large differential due to equipment size. At times when the building load is low, the temperature could potentially sit a few degrees off setpoint for some time. With the time factor added, the thermostat would compensate for this, turning on the equipment even though the temperature had not reached the limits described above.
DI2 COOL LOCKOUT
DI2 may be set as cool lockout for operation with economizers. An outdoor temperature switch may be wired in such that when DI2 is closed, the second and third stages of cooling are disabled.
SMART RECOVERY
“Smart Recovery” may be enabled to insure occupant comfort while saving money. It takes the building load into consideration and ramps the setpoint when going from the unoccupied mode to the occupied mode. At the beginning of the occupied mode, the occupied setpoint will be reached, many times without the need for the second stage to come on. This feature is automatically disabled when DI3 is set to the external time clock.
AUXILIARY OUTPUT
An auxiliary relay output is available to output a signal based on the occupancy status. It is commonly used with an economizer minimum position control, or to signal an outdoor air damper to open in occupied times in lieu of an economizer. It may also be used for lighting or hot water heaters. Keep in mind that although it is an isolated relay (separate common terminal), it is rated at 2A@24 VAC. For loads that exceed this, use an external relay. It may be set to be open (N.O.) or closed (N.C.) when the thermostat is operating in the occupied mode and will be the opposite during the unoccupied mode.
BUILT-IN DELAYS
The SZ1022N and SZ1024N have delays built into the programming sequences to protect equipment. The fan has a minimum on-and-off time of 30 seconds. When the fan is in AUTO or COOL mode, it will come on 30 seconds before the heating or cooling stages are allowed to sequence on, and remain on for 30 seconds after the heating or cooling stages sequence off. Each stage has a minimum on-and-off time of two minutes. There is a minimum of two minutes between when one stage turns on until the next stage is allowed to turn on, as well as when one stage turns off until the next stage is allowed to turn off.
DELAY ON POWERUP
The SZ1022N and SZ1024N have an adjustable delay on power-up. When several thermostats are used at one location, and the power goes out, most thermostats turn all of the units back on at the same time on regain of power, creating a peak. The thermostat allows you to set a value, in seconds, where no outputs are allowed to turn on for that length of time on powerup. Setting each unit to a different delay allows you to soft start your system, and thus prevent this peak.
CHECKOUT
Note: The fan has a minimum on-and-off time of 30 seconds. The heating and cooling stages have a minimum on-and-off time of 2 minutes.
You may verify the status of the heating and cooling stages and fan in monitoring screens 5, 6, and 7, which are accessed by pressing the SERVICE STATUS button.
No Display
Check for 24 VAC on terminals “+24” and “-24”. Check the cable connecting the cover to the base for a good connection.
Fan Does Not Come On
The fan is on whenever the fan LED is on. If the fan should be on, but the fan LED is off, check the fan and system switch modes, and the unoccupied fan mode in programming. If the fan is off but the fan LED is on, check the wiring. Short terminals “R” to “G” and see if the fan comes on. This is a check for a mechanical relay failure.
Heating or Cooling Does Not Come On
At least one stage of heating is on whenever the heating LED is on, and at least one stage of cooling is on whenever the cooling LED is on. If heating or cooling should be on but the heating or cooling LED is off, check the fan and system switch modes. Also, check the heating and cooling setpoints, offsets and differentials, and the room temperature to be sure heating or cooling should be on. If using outdoor air heating and cooling lockouts, or discharge air high and low limits, check their values to be sure heating or cooling is allowed. If heating or cooling is off, but the corresponding LED is on, check the wiring. Short terminals “R” to “W1”, “W2”, “Y1”, “Y2”, or “B/O” and see if the heating or cooling comes on. This is a check for a mechanical relay failure.
Wrong Temperature Display
If any of the temperatures is reading slightly high or low, there are two adjustment pots located in the cover to adjust them. “T1” is for the room temperature and “T2” is for the discharge air temperature. If the temperature is at a minimum or maximum reading, check the sensor dipswitch positions.(See setup instructions.) Check for wiring problems (opens or shorts). A remote 1000 sensor should read 1080 to 1090 at room temperature. The built-in sensor should read 108 to 109 at room temperature.
Service LED is On
If the service LED is on, it may be for monitoring purposes or it may indicate a critical problem. The first monitoring screen accessed by pressing the service status button will display why the light is on.
Outputs Will Not Shut Off
First, check the room temperature and the setpoints and determine whether the output should be on. There are delays and minimum on and off times for the fan and heating and cooling stages. Also, check the service status menus to verify that the outputs are on. Turning the system to “off” will instantly turn all outputs off. The thermostat can be reset by pressing the system switch button and the service status button simultaneously.
SERVICE SCREENS
Continually pressing the service status button allows more extensive monitoring. The screens are shown at the right.
Six LEDs on the face allow the occupant to view the current operating status of the thermostat.
OCCUPIED
This LED will be lit whenever the unit is operating in the occupied mode.
HEATING
This LED will be lit when any heat output is closed.
COOLING
This LED will be lit when any cooling output is closed.
FAN
This LED will be lit when the fan output is closed.
SERVICE
This LED will be lit when the high or low discharge air limit has been reached, when the fan interlock has indicated failure, or when the filter service or service input are closed.
PROGRAM/DATA
This LED will be lit when the thermostat is within the programming or clock setup menus. It will blink when the unit is being accessed by a PC. Additional monitoring is available by continually pressing the service key.
SETPOINT ADJUSTMENT
The occupant may temporarily change the occupied heating and cooling setpoints +/- 5°F by factory default. This setpoint change will remain until the end of the current occupied period, at which time the program reverts to the setpoints defined in programming. To change the range of adjustment allowed, see programming step #15.
OVERRIDE
The occupant has the ability to put the unit into occupied mode by pressing the override button on the front. By factory default, the unit will remain in the occupied mode for 180 minutes. This value may be changed from 0 to 255 minutes in programming step #16.
FAN SWITCHING
The option to allow the occupant to change the occupied fan mode is allowed by factory default. To lock out access to fan switching, see programming step #7.
SYSTEM SWITCHING
The option to allow the occupant to change the system mode is allowed by factory default. To lock out access to system switching, see programming step #5.
SETTING CLOCK & SCHEDULE
The ability to set the clock and schedule is allowed by factory default. An access code may be required as set in programming step #42, or access may be denied altogether using dipswitches described in the setup section.
PROGRAMMING
The ability to program control parameters is allowed by factory default. An access code may be required as set in programming step # 41, or access may be denied altogether using dipswitches described in the setup section. Inside the hinged door of the thermostat is the SuperstatTM User’s Guide. This guide is designed to assist the installer in explaining to the end user how to operate their new thermostat, as well as serve as a handy future reference for the end user. We recommend that the installer fill out pages 1, 5, 7 and 8 (where applicable) and explain to the user how the thermostat operates, what settings may be changed, and how the time clock schedules are used.
TCS/Basys Controls Technical Support 800-288-9383
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
ADI
ADI | 1
2 | #
# | DI2 control mode
DI3 control mode | 0=cool lockout 1=monitor 2=service 0=filter service | See Setup (page 8).
See Setup (page 7). |
ADI |
3 |
# |
Occupied Fan mode | 1=external override 2=external time clock 0=on, 1=cool, 2=auto |
Fan Switch button on keypad. |
ADI | 4 | # | System mode | 0=off,1=auto,2=heat | System Switch button on keypad. |
ADI | 5 | Day | Internal time clock day | 3=cool 0-6, mon to sunday | Day of Week. |
ADI | 6 | Hours | Internal time clock hours | 0-23 | 0-11 (AM), 12-23 (PM). |
ADI
ADI | 7
8 | DegF (C)
DegF | Setpoint adjust limit from keypad
Differential for cool stage 1 | 0-50 (0-28)
0-50 | Limits keypad adjustment of occupied heating and cooling setpoints. See note 5. |
ADI | 9 | DegF | Offset for cool stage 1 | 0-50 | |
ADI | 10 | DegF | Differential for cool stage 2 | 0-50 | |
ADI | 11 | DegF | Offset for cool stage 2 | 0-50 | |
ADI | 12 | DegF | Differential for heat stage 1 | 0-50 | |
ADI | 13 | DegF | Offset for heat stage 1 | 0-50 | |
ADI | 14 | DegF | Differential for heat stage 2 | 0-50 | |
ADI | 15 | DegF | Offset for heat stage 2 | 0-50 | |
ADI | 16 | DegF | Differential for stage 3 | 0-50 | Stage 3 can do either Heating or Cooling. |
ADI | 17 | DegF | Offset for stage 3 | 0-50 | |
ADI
ADI | 18
19 | DegF
Seconds | Setpoint shift value
Internal time clock second | 0-50
0-59 | When DI2 is selected Monitor, this is number of degrees that the occupied cooling setpoint is shifted up and the heating setpoint is shifted down. |
ADI | 20 | Minutes | Internal time clock minute | 0-59 | |
ADI | 21 | DegF (C) | Occupied heating setpoint | 40-90 (4-32) | Occupied heating setpoint must be less |
ADI | 22 | DegF (C) | Unoccupied heating setpoint | 40-90 (4-32) | than occupied cooling setpoint. Unoccupied heating setpoint must be |
ADI | 23 | DegF (C) | Occupied cooling setpoint | 40-90 (4-32) | less than unoccupied cooling setpoint. |
ADI | 24 | DegF (C) | Unoccupied cooling setpoint | 40-90 (4-32) | |
ADI | 25 | DegF (C) | Room temperature | 40-90 (4-32) | Read only. See Note 5. |
ADI
ADI | 26
27 | DegF (C)
DegF (C) | Discharge air low limit
Discharge air high limit | 0-150 (-18-65)
0-150 (-18-65) | Discharge air high limit must be greater than discharge air low limit. |
ADI | 28 | DegF (C) | Discharge air temperature | 0-150 (-18-65) | Read only. |
ADI | 29 | Minutes | Override period | 0-255 | Unoccupied override time allowed. |
ADI | 30 | Seconds | Power on delay time | 0-255 | Time before control begins on powerup. |
ADI | 31 | Minutes | Remaining override time | 0-255 | Read Only. Time remaining before the |
ADI | 32 | DegF (C) | Current user setpoint adjust | -50-50, (28-28) | override period expires. Read Only. + or – amount the occupied |
ADI |
33 |
Minutes |
Monday Occupied start time |
0-1440 | setpoint has been adjusted from actual settings. (See Note 5.) There are two occupied and two un- |
ADI | 34 | Minutes | for schedule A Monday Occupied end time | 0-1440 | occupied time periods allowed per day. |
ADI | 35 | Minutes | for schedule A Monday Occupied start time | 0-1440 | All times are measured in minutes from midnight. |
ADI | 36 | Minutes | for schedule B Monday Occupied end time | 0-1440 | |
ADI | 37 | for schedule B Tuesday | 0-1440 | ||
ADI | 38 | Tuesday | 0-1440 | ||
ADI | 39 | Tuesday | 0-1440 |
Pointmap Table for SZ1022N (continued)
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
ADI | 40 | Tuesday | 0-1440 | ||
ADI | 41 | Wednesday | 0-1440 | ||
ADI | 42 | Wednesday | 0-1440 | ||
ADI | 43 | Wednesday | 0-1440 | ||
ADI | 44 | Wednesday | 0-1440 | ||
ADI | 45 | Thursday | 0-1440 | ||
ADI | 46 | Thursday | 0-1440 | ||
ADI | 47 | Thursday | 0-1440 | ||
ADI | 48 | Thursday | 0-1440 | ||
ADI | 49 | Friday | 0-1440 | ||
ADI | 50 | Friday | 0-1440 | ||
ADI | 51 | Friday | 0-1440 | ||
ADI | 52 | Friday | 0-1440 | ||
ADI | 53 | Saturday | 0-1440 | ||
ADI | 54 | Saturday | 0-1440 | ||
ADI | 55 | Saturday | 0-1440 | ||
ADI | 56 | Saturday | 0-1440 | ||
ADI | 57 | Sunday | 0-1440 | ||
ADI | 58 | Sunday | 0-1440 | ||
ADI | 59 | Sunday | 0-1440 | ||
ADI | 60 | Sunday | 0-1440 | ||
BD
BD | 1
2 | DI1 control mode
Unocc fan mode | 0=fan proving, 1=Monitor 0=cool, 1= auto | See “Operation” (page 8).
Not accessible with Fan Switch button. | |
BD | 3 | Enable occupied fan switch | 0 = No, 1=Yes | Enables Fan Switch button. | |
BD | 4 | Enable system switch | 0 = No, 1=Yes | Enables System Switch button. | |
BD
BD | 5
6 | Use of discharge air sensor
Enable smart recovery routine | 0 = No, 1=Yes
0 = No, 1=Yes | Always monitored, enables discharge air function. 4° per hour setpoint ramp prior to oc- | |
BD | 7 | Require access code | 0 = No, 1=Yes | cupancy for both heating and cooling. Programming access from keypad. | |
BD | 8 | for programming? Require access code | 0 = No, 1=Yes | Clock/Schedule access from keypad. | |
BD | 9 | for clock/schedule? Enable cool stage 2 | 0=disable, 1=enable | Disable unused stages (recommended). | |
BD | 10 | Enable heat stage 2 | 0=disable, 1=enable | ||
BD | 11 | Enable stage 3 | 0=disable, 1=enable | ||
BD | 12 | Stage 3 action | 0=cool, 1=heat | Stage 3 can be either heating or cooling. | |
BD
BD | 13
14 | Time clock relay output
Control mode | 0=Normally Open 1=Normally Closed 0=Proportional | State of relay output during occupied period. Stages turned on and off using offsets | |
BD |
15 |
DI1 source | 1=Prop. + Integral 0=local contact | and differentials only. Stages turned on and off using offsets and differentials + a time factor. Local means read by or controlled by | |
BD |
16 |
DI2 source | 1=remote request 0=local contact | Thermostat. Remote means the state of the input or output is controlled only by computer. | |
BD | 17 | DI3 source | 1=remote request 0=local contact | ||
BD | 18 | Override function source | 1=remote request 0=local keypad | ||
BD | 19 | Fan relay source | 1=remote request 0=local mode | ||
BD | 20 | Remote DI1 request | 1=remote request 0=off, 1=on | When selected to be Remote, turns | |
input or output on and off. |
Point map Table for SZ1022N (continued)
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
BD | 21 | Remote DI2 request | 0=off, 1=on | ||
BD | 22 | Remote DI3 request | 0=off, 1=on | ||
BD | 23 | Remote override request | 0=off, 1=on | This is a permanent override. | |
BD | 24 | Remote Fan request | 0=off, 1=on | ||
BD | 25 | Heat stage 1 relay status | 0=off, 1=on | Read only. | |
BD | 26 | Heat stage 2 relay status | 0=off, 1=on | Read Only | |
BD | 27 | Cool stage 1 relay status | 0=off, 1=on | Read only. | |
BD | 28 | Cool stage 2 relay status | 0=off, 1=on | Read only. | |
BD | 29 | Fan relay status | 0=off, 1=on | Read only. | |
BD | 30 | Stage 3 relay status | 0=off, 1=on | Read only. | |
BD | 31 | Time clock relay status | 0=off, 1=on | Read only. | |
BD | 32 | DI1 status | 0=off, 1=on | Read only. | |
BD | 33 | DI2 status | 0=off, 1=on | Read only. | |
BD | 34 | DI3 status | 0=off, 1=on | Read only. | |
BD | 35 | Override status | 0=off, 1=on | Read only. | |
BD
BD | 36
37 | Device’s occupied status
Service status | 0=Occupied 1=Unoccupied 0=OK, 1= fail | Read only.
Read only. See Note 1. | |
BD
BD | 38
39 | Fan interlock status
Filter service status | 0= OK, 1= Fan interlock fail 0=OK, | Read only. DI1 Fan Proving.
Read only. DI3 Filter Status. | |
BD | 40 | Discharge air high limit | 1=Check filter 0=OK, | Read only. Discharge air function. | |
BD | 41 | Discharge air low limit | 1= Above high limit 0=OK, | Read only. Discharge air function. | |
BD | 42 | DI2 service status | 1= Below low limit 0=OK, | Read only. DI2 Service. | |
1= Check DI2 |
NOTE 1
The Service status point represents general Check status. If this is point is 1, the user can find out the actual failing
condition by polling point 38 to 42. If this point is 0, points 38 to 42 will also be 0.
NOTE 2
All of the ADI and BD points support the override function. The value overridden will be stored permanently, so the status attribute will never have any override active status. Because none of these points support the override release function, the controller will acknowledge the override release function but never release the value. The controller will respond with NAK error N10 if the value for the override command is outside the limits for that point. Points that are Read Only can not be overridden. The controller will acknowledge the override command, but the actual change will never happen.
NOTE 3
All of the points in this map can be adjusted through the keypad except Read Only points and BD points 15 through 24. In the case of loss of communications for 15 minutes (i.e., if the controller is not addressed for 15 minutes), the controller will revert BD points 15 through 24 to zero value (make them all local requests).
NOTE 4
Communications are disabled when programming mode or clock/schedule mode is entered via the keypad. Entering programming mode via the keypad can be disabled.
NOTE 5
If the temperature in programming step #4 is set to be displayed in degrees Fahrenheit, the values of ADI 7, ADI 21 through ADI 28 and ADI 32 will be Fahrenheit values. If the temperature is set to be displayed in degrees Celsius, these ADI values will be in Celsius.
Pointmap Table for SZ1024N (See page 13 for Pointmap Table for SZ1022N)
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
ADI | 1 | # | DI2 control mode | 0=cool lockout | See “Setup” (page 8). |
1=monitor | |||||
2=service | |||||
ADI | 2 | # | DI3 control mode | 0=filter service | See “Setup” (page 7). |
1=external override | |||||
2=external timeclock | |||||
ADI | 3 | # | System mode | 0=off,1=auto, | “System Switch” button on keypad. |
3=cool, 2=heat | |||||
4=emergency heat | |||||
ADI | 4 | Day | Internal time clock “day” | 0-6, mon to sunday | Day of Week. |
ADI | 5 | Hours | Internal time clock “hours” | 0-23 | 0-11 (AM), 12-23 (PM). |
ADI | 6 | DegF (C) | Setpoint adjust limit from keypad | 0-50 (0-28) | Limits keypad adjustment of occupied |
heating and cooling setpoints. (See Note 5.) | |||||
ADI | 7 | DegF | Differential for compressor 1 | 0-50 | |
ADI | 8 | DegF | Offset for compressor 1 | 0-50 | |
ADI | 9 | DegF | Differential for compressor 2 | 0-50 | |
ADI | 10 | DegF | Offset for compressor 2 | 0-50 | |
ADI | 11 | DegF | Diff. for auxiliary heat 1 | 0-50 | |
ADI | 12 | DegF | Offset for auxiliary heat 1 | 0-50 | |
ADI | 13 | DegF | Diff. for auxiliary heat 2 | 0-50 | |
ADI | 14 | DegF | Offset for auxiliary heat 2 | 0-50 | |
ADI | 15 | DegF | Setpoint shift value | 0-50 | When DI2 is selected “Monitor”, this is |
number of degrees that the occupied | |||||
cooling setpoint is shifted up and the | |||||
heating setpoint is shifted down. | |||||
ADI | 16 | Seconds | Internal time clock “second” | 0-59 | |
ADI | 17 | Minutes | Internal time clock “minute” | 0-59 | |
ADI | 18 | DegF (C) | Occupied heating setpoint | 40-90 (4-32) | Occupied heating setpoint must be less |
than occupied cooling setpoint. | |||||
ADI | 19 | DegF (C) | Unoccupied heating setpoint | 40-90 (4-32) | Unoccupied heating setpoint must be |
less than unoccupied cooling setpoint. | |||||
ADI | 20 | DegF (C) | Occupied cooling setpoint | 40-90 (4-32) | |
ADI | 21 | DegF (C) | Unoccupied cooling setpoint | 40-90 (4-32) | |
ADI | 22 | DegF (C) | Room temperature | 40-90 (4-32) | Read only. See Note 5. |
ADI | 23 | DegF (C) | Discharge air low limit | 0-150 (-18-65) | Discharge air high limit must be greater |
than discharge air low limit. | |||||
ADI | 24 | DegF (C) | Discharge air high limit | 0-150 (-18-65) | |
ADI | 25 | DegF (C) | Discharge air temperature | 0-150 (-18-65) | Read only. |
ADI | 26 | Minutes | Override period | 0-255 | Unoccupied override time allowed. |
ADI | 27 | Seconds | Power on delay time | 0-255 | Time before control begins on powerup. |
ADI | 28 | Minutes | Remaining override time | 0-255 | Read Only. Time remaining before the |
override period expires. | |||||
ADI | 29 | DegF (C) | Current user setpoint adjust | -50-50 (-28-28) | Read Only. + or – amount the occupied |
setpoint has been adjusted from actual | |||||
settings. (See Note 5.) | |||||
ADI | 30 | Minutes | Monday Occupied start time | 0-1440 | There are two occupied and two un- |
for schedule A | occupied time periods allowed per day. | ||||
ADI | 31 | Minutes | Monday Occupied end time | 0-1440 | |
for schedule A | All times are measured in minutes from | ||||
ADI | 32 | Minutes | Monday Occupied start time | 0-1440 | midnight. |
for schedule B | |||||
ADI | 33 | Minutes | Monday Occupied end time | 0-1440 | |
for schedule B | |||||
ADI | 34 | Tuesday | 0-1440 | ||
ADI | 35 | Tuesday | 0-1440 | ||
ADI | 36 | Tuesday | 0-1440 | ||
ADI | 37 | Tuesday | 0-1440 | ||
ADI | 38 | Wednesday | 0-1440 | ||
ADI | 39 | Wednesday | 0-1440 | ||
ADI | 40 | Wednesday | 0-1440 |
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
ADI | 41 | Wednesday | 0-1440 | ||
ADI | 42 | Thursday | 0-1440 | ||
ADI | 43 | Thursday | 0-1440 | ||
ADI | 44 | Thursday | 0-1440 | ||
ADI | 45 | Thursday | 0-1440 | ||
ADI | 46 | Friday | 0-1440 | ||
ADI | 47 | Friday | 0-1440 | ||
ADI | 48 | Friday | 0-1440 | ||
ADI | 49 | Friday | 0-1440 | ||
ADI | 50 | Saturday | 0-1440 | ||
ADI | 51 | Saturday | 0-1440 | ||
ADI | 52 | Saturday | 0-1440 | ||
ADI | 53 | Saturday | 0-1440 | ||
ADI | 54 | Sunday | 0-1440 | ||
ADI | 55 | Sunday | 0-1440 | ||
ADI | 56 | Sunday | 0-1440 | ||
ADI | 57 | Sunday | 0-1440 | ||
BD
BD | 1
2 | DI1 control mode
Occ fan mode | 0=fan proving, 1=Monitor 0=On, 1= Auto | See “Operation” (page 8).
“Fan Switch” button on key pad | |
BD | 3 | Enable occupied fan switch | 0 = No, 1=Yes | Enables “Fan Switch” button. | |
BD | 4 | Enable system switch | 0 = No, 1=Yes | Enables “System Switch” button. | |
BD
BD | 5
6 | Use of discharge air sensor
Enable smart recovery routine | 0 = No, 1=Yes
0 = No, 1=Yes | Always monitored, enables discharge air function. 4° per hour setpoint ramp prior to oc- | |
BD | 7 | Require access code | 0 = No, 1=Yes | cupancy for both heating and cooling. Programming access from keypad. | |
BD | 8 | for programming? Require access code | 0 = No, 1=Yes | Clock/Schedule access from keypad. | |
BD | 9 | for clock/schedule? Enable compressor 2 | 0=disable, 1=enable | Disable unused stages (recommended). | |
BD | 10 | Enable auxiliary heat 1 | 0=disable, 1=enable | ||
BD | 11 | Enable auxiliary heat 2 | 0=disable, 1=enable | ||
BD
BD | 12
13 | Reverse valve action for cooling
Time clock relay output | 0=Normally Open 1=Normally Closed 0=Normally Open | State of relay output during occupied period. State of relay output during occupied | |
BD | 14 | Control mode | 1=Normally Closed 0=Proportional | period. Stages turned on and off using offsets | |
BD |
15 |
DI1 source | 1=Prop. + Integral 0=local contact | and differentials only. Stages turned on and off using offsets and differentials + a time factor. “Local” means read by or controlled by | |
BD |
16 |
DI2 source | 1=remote request 0=local contact | Thermostat. “Remote” means the state of the input or output is controlled only by computer. | |
BD | 17 | DI3 source | 1=remote request 0=local contact | ||
BD | 18 | Override function source | 1=remote request 0=local keypad | ||
BD | 19 | Fan relay source | 1=remote request 0=local mode | ||
BD | 20 | Remote DI1 request | 1=remote request 0=off, 1=on | When selected to be “Remote”, turns | |
BD | 21 | Remote DI2 request | 0=off, 1=on | input or output on and off. | |
BD | 22 | Remote DI3 request | 0=off, 1=on | ||
BD | 23 | Remote override request | 0=off, 1=on | This is a permanent override. | |
BD | 24 | Remote Fan request | 0=off, 1=on |
Pointmap Table for SZ1024N (continued)
NPT | NPA | UNITS | POINT DESCRIPTION | RANGE/VALUE | ADDITIONAL NOTES |
BD | 25 | Aux heat 1 relay status | 0=off, 1=on | Read only. | |
BD | 26 | Aux heat 2 relay status | 0=off, 1=on | Read Only | |
BD | 27 | Compressor 1 relay status | 0=off, 1=on | Read only. | |
BD | 28 | Compressor 2 relay status | 0=off, 1=on | Read only. | |
BD | 29 | Fan relay status | 0=off, 1=on | Read only. | |
BD | 30 | Reverse valve relay status | 0=off, 1=on | Read only. | |
BD | 31 | Timeclock relay status | 0=off, 1=on | Read only. | |
BD | 32 | DI1 status | 0=off, 1=on | Read only. | |
BD | 33 | DI2 status | 0=off, 1=on | Read only. | |
BD | 34 | DI3 status | 0=off, 1=on | Read only. | |
BD | 35 | Override status | 0=off, 1=on | Read only. | |
BD | 36 | Device’s occupied status | 0=Occupied | Read only. | |
1=Unoccupied | |||||
BD | 37 | Service status | 0=OK, 1= fail | Read only. See Note 1. | |
BD | 38 | Fan interlock status | 0= OK, 1= Fan | Read only. DI1 Fan Proving. | |
interlock fail | |||||
BD | 39 | Filter service status | 0=OK, 1=check | Read only. DI3 Filter Status. | |
Filter | |||||
BD | 40 | Discharge air high limit | 0=OK, 1= Above | Read only. Discharge air function. | |
high limit | |||||
BD | 41 | Discharge air low limit | 0=OK, 1= Below | Read only. Discharge air function. | |
low limit | |||||
BD | 42 | DI2 service status | 0=OK, 1= Check DI2 | Read only. DI2 Service. |
NOTE 1
The Service status point represents general Check status, if this is point is 1, then by polling point 38 to 42, the user can find out actual failing condition. If this point is 0 then points 38 to 42 will be also 0.
NOTE 2
All of the ADI and BD points support the override function. The value overridden will be stored permanently, so the status attribute will never have any override active status. Because none of these points support the override release function, the controller will acknowledge the override release function but never release the value. The controller will respond with NAK error N10 if the value for the override command is outside the limits for that point. Points that are “Read Only” can not be overridden. The controller will acknowledge the override command, but the actual change will never happen.
NOTE 3
All of the points in this map can be adjusted through the keypad except: “Read Only” points and BD points 15 through In the case of loss of communications for 15 minutes (i.e., if the controller is not addressed for 15 minutes), the controller will revert BD points 15 to 24 to zero value (make them all local requests).
NOTE 4
Communications are disabled when programming mode or clock/schedule mode is entered via the key pad. Entering programming mode via the keypad can be disabled.
NOTE 5
If the temperature in programming step #4 is set to be displayed in degrees Fahrenheit, the values of ADI 6, ADI 18 through ADI 25 and ADI 29 will be Fahrenheit values. If the temperature is set to be displayed in degrees Celsius, these ADI values will be in Celsius.
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