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

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SZ1022N/SZ1024N

Conventional Multistage
Heating & Cooling/Heat Pump
Thermostats

Product Manual      

Description                        

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. 

Features                            

z

Stand-alone or network operation

z

Discharge air sensor input with high and low limits

z

The SZ1022N offers up to three stages heating and two
stages cooling, or two stages heating and three stages
cooling, while the SZ1024N offers up to two compressor
and two auxiliary heat stages

z

Adjustable delay on powerup for soft starts

z

P+I control option

z

Smart Recovery

z

No backup battery required

z

Built-in HVAC equipment protection

z

32 character LCD display

z

Six LEDs for status monitoring 

z

Remote room sensing capability

z

User setpoint adjustment limits

z

Local and remote override capability 

z

System and fan switching with access lockouts

z

Auxiliary time clock output (economizers)

z

Fan interlock safety option

z

Filter service input and indication

z

Equipment monitoring inputs and indication

z

External time clock input 

z

Energy management input for setpoint shift.

z

Access to programming or schedule may be locked out or
limited with the use of an access code

z

Fahrenheit or Celsius temperature display

Contents                            

Description ...............................................................................1
Features ....................................................................................1
Mounting ..................................................................................1
Wiring.......................................................................................2
N2 Bus Connections ................................................................2
Setup.........................................................................................3
Programming............................................................................4
Setting Clock and Schedule .....................................................7
Operation..................................................................................8
Checkout and Troubleshooting ................................................9
LED Description ....................................................................11
Limiting Occupant Access .....................................................12
User’s Guide ..........................................................................12
N2 Point Mapping Table (SZ1022N).....................................13
N2 Point Mapping Table (SZ1024N).....................................16

Mounting                            

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 which reflects 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 which is accessible for adjusting its settings. 

        Communicating Thermostats

Version 1.2

Содержание SZ1022N

Страница 1: ...ut economizers z Fan interlock safety option z Filter service input and indication z Equipment monitoring inputs and indication z External time clock input z Energy management input for setpoint shift...

Страница 2: ...hielded 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 accept two remote s...

Страница 3: ...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 you...

Страница 4: ...g Screen Press the program setup button to access the following screens Access Code Entry Screen Will appear if access code is required for programming Use 248 as the default If the wrong code is ente...

Страница 5: ...for heat stage 1 First stage is normally 0 offset Heat Stage 1 Differential Screen Enter a differential value for heat stage 1 Heat Stage 2 Offset Screen Enter an offset value for heat stage 2 This sc...

Страница 6: ...his screen only appears if compressor 2 is enabled Compressor Stage 2 Differential Screen Enter a differential value for compressor stage 2 This screen only appears if compressor stage 2 is enabled Au...

Страница 7: ...creen Setting Clock and Schedule 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 softwa...

Страница 8: ...set DI3 to 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 se...

Страница 9: ...rential 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...

Страница 10: ...e 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...

Страница 11: ...e following screens Service Screen This message may be followed by any or all of the following CHECK FILTER CHECK FAN DISCHARGE HIGH DISCHARGE LOW or CHECK DI2 Discharge Air Temperature Screen Shows d...

Страница 12: ...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 acces...

Страница 13: ...e heating setpoint is shifted down ADI 19 Seconds Internal time clock second 0 59 ADI 20 Minutes Internal time clock minute 0 59 ADI 21 DegF C Occupied heating setpoint 40 90 4 32 Occupied heating set...

Страница 14: ...s 4 per hour setpoint ramp prior to oc cupancy for both heating and cooling BD 7 Require access code 0 No 1 Yes Programming access from keypad for programming BD 8 Require access code 0 No 1 Yes Clock...

Страница 15: ...eck 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...

Страница 16: ...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...

Страница 17: ...e access code 0 No 1 Yes Clock Schedule access from keypad for clock schedule BD 9 Enable compressor 2 0 disable 1 enable Disable unused stages recommended BD 10 Enable auxiliary heat 1 0 disable 1 en...

Страница 18: ...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 funct...

Страница 19: ...R 2800 LAURA LANE MIDDLETON WI 53562 800 288 9383 FAX 608 836 9044 www tcsbasys com 19...

Страница 20: ...R 2800 LAURA LANE MIDDLETON WI 53562 800 288 9383 FAX 608 836 9044 www tcsbasys com 20 Rev 0305...

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