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2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com

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SZ1041A

Make Up Air Unit Thermostat

Product Manual           

Description                              

The SZ1041A is a microprocessor-based programmable 

thermostat designed to control   air  handling units and 

make up air units with modulating economizers and/or 

modulating heating or cooling. The SZ1041A has a 365-

day time clock.

Features                                 

•  Stand-alone or network operation

•  Outdoor air sensor input with heating & cooling lockout

•  Adjustable delay on power-up and start-up for  

soft starts

•  P+I control option on digital stages

•  Smart Recovery

•  No battery backup required

•  Built-in HVAC equipment protection

•  32 character LCD display

•  Six status LEDs for monitoring  

•  Remote room sensing capability

•  User setpoint adjustment limits

•  Local and remote override capability 

•  System and fan switching with access lockouts  

•  Equipment monitoring inputs and indication

•  External time clock input 

•  Access to programming or schedule may be locked 

out or limited with the use of an access code

•  Fahrenheit or Celsius temperature display

Contents                                 

Description

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Features

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Mounting 

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Wiring

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Setup

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Programming

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Setting Clock & Schedule

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Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Checkout & Troubleshooting

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LED Description

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Limiting Occupant Access  . . . . . . . . . . . . . . . . . . . . . . 15

User’s Guide

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Mounting                                

The SZ1041A is 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 dry-

wall. 

For best results, the thermostat should be mounted on 

an interior wall which reflects normal room environment, 

at a height of approximately five feet from the floor. 

Avoid areas exposed to direct sunlight, unusual heat 

or cool sources, open doors and windows, unventilated 

locations and hot or cold air from diffusers.
If using a remote room sensor, it should be mounted in 

the manner described above. The thermostat may then 

be mounted in an area which is accessible for adjusting 

its settings. 

Caution

: Remove power from thermostat prior to 

mounting.

        Communicating Thermostats

Summary of Contents for SZ1041A

Page 1: ...l time clock input Access to programming or schedule may be locked out or limited with the use of an access code Fahrenheit or Celsius temperature display Contents Description 1 Features 1 Mounting 1 Wiring 2 Setup 3 Programming 4 Setting Clock Schedule 8 Operation 9 Checkout Troubleshooting 12 LED Description 14 Limiting Occupant Access 15 User s Guide 15 Mounting The SZ1041A is designed for wall...

Page 2: ...sensors Consult the TS Series Temperature Sensor Submittal Data sheet 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 Powering the SZ1041A Superstats are powered from 24 VAC 20 If wiring for communi...

Page 3: ... Using remote room sensor with both discharge and outdoor air sensors KEypad Access The dipswitches in the cover shown above connected with ribbon cable must be set in order to lock the user out of programming and or to set the clock and sched ule Use the guide below to set these dipswitches for your application User access may also be limited with an access code set in programming The fan and sys...

Page 4: ...re indication System Access Screen Choose whether or not to enable user s access to the sys tem switch to set the system mode System Mode Screen Choose from AUTO HEAT COOL or OFF for system mode In the OFF mode all outputs are off Fan Access Screen Choose whether or not to enable the user s access to the fan switch to set the occupied fan mode Occupied Fan Mode Screen Choose between ON continuous ...

Page 5: ... if heat stage 2 is enabled as heat Heat Stage 2 Differential Screen Enter a differential value for heat stage 2 This screen only appears if heat stage 2 is enabled Cool Stage 1 Offset Screen Enter an offset value for cool stage 1 First stage is normally 0 offset Cool Stage 1 Differential Screen Enter a differential value for cool stage 1 Cool Stage 2 Offset Screen Enter an offset value for cool s...

Page 6: ...isabled AO CONTROL BASED ON SPACE 48 program setup ENABLE HEATING LOW LIMIT YES 49 program setup ENABLE MOD OUT 1 MIN MAX POS YES 54 program setup MOD OUT 1 MIN POS 10 55 program setup MOD OUT 1 MAX POS 99 56 program setup Reset Ratio Factor Screen Enter a reset ratio factor This is the number of degrees that the discharge air setpoint is raised when the space tempetature falls by 1 degree for hea...

Page 7: ...cess Screen Choose whether or not a code will be required to enter programming setup A dipswitch option to lock out access altogether is also avail able Clock and Schedule Access Screen Choose whether or not a code will be required to enter clock and schedule setup A dipswitch option to lock out access alto gether is also available Access Code Screen Enter an access 0 to 255 code that will be used...

Page 8: ... next screen does not appear Occupied Times Screen Set hours or minutes of start and end times for up to two occupied periods Occupied Times Screen Set hours or minutes of start and end times for up to two occupied periods Holiday Announcement Screen Announces the next screen Holidays 1 Screen Set holiday peri ods 1 through 12 month date and dura tion for the periods that will follow the holiday 1...

Page 9: ...in the 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 b...

Page 10: ...ue to operate according to its occupied setting If you are using DI2 as monitor for another purpose make sure to set the setpoint shift value to zero R 2800 LAURA LANE MIDDLETON WI 53562 800 288 9383 FAX 608 836 9044 www tcsbasys com 10 Stage Output Parameters The SZ1041A will control up to two stages of either heat ing or cooling The SZ1041A will control two stages of heating and two stages of co...

Page 11: ...41A has delays built into the programming sequences to protect equipment The fan has a mini mum 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 devices are allowed to sequence on and remain on for 2 minutes after the heating or cooling devices sequence off Each stage has a minimum on and off time of two minutes There is a ...

Page 12: ... that the top LED is lit If not press the OVERRIDE button The LED should light up 6 Take note of the current temperature reading Press DIGITAL APPLICATION LED SERVICE SCREEN CONTROL SENSOR OR INPUT INDICATION DI STATUS SCREEN PROVIDED DEVICE NEEDED DI1 Fan Proving YES CHECK FAN YES turns system mode to off Differential FAN OK requires manual re start pressure or or FAIL set system to auto current ...

Page 13: ...ystem switch button and the service status button simultaneously the WARMER up button The setpoint adjustment screen should now be showing Press the WARMER button until the heating setpoint is greater than the current temperature by at least five degrees The fan will come on The heating stage s will sequence on after 30 seconds 7 Press the cooler down button until the heating set point is one degr...

Page 14: ...ir limit has been reached when the fan interlock has indi cated 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 Main Monitoring Screen Press the service bu...

Page 15: ...on 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 64 or access may be denied altogether using dipswitches described in the setup sec tion Programming The ...

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