CaptiveAire SZ1041A User Manual

R

Communicating Thermostats

Submittal Data

SZ1041A

Programmable 365-Day Thermostat
For Make Up Air Units

Description

The SZ1041A has a 365-day time clock and is
designed for make up air units.

The SZ1041A features:

• Stand-alone or network operation

• 365-day time clock with two holiday schedules with
automatic leap year and daylight savings correction

• Discharge air sensor input

• Outdoor air sensor input with heating & cooling
lockouts

• Two stages each of heating and cooling, plus a third
virtual stage of cooling

• 0 to 20 mA or 4 to 20 mA analog output

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

• P+I control option on digital stages

• Smart Recovery

• No backup battery required

• Minimum on/off times for HVAC equipment protection

• 32 character LCD display

• Six status LEDs

• Remote room sensing capability

• User setpoint adjustment limits

• Local and remote override capability

• System and fan switching with access lockouts

• Fan interlock safety option

• Filter service input and indication

• Equipment monitoring inputs and indication

• External time clock input

• Energy management input for setpoint shift

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

• Fahrenheit or Celsius temperature display

Specifications

General

Accuracy: +/- 0.5%
Display resolution: +/-1°F (0.6°C)
Display: 32-character LCD
Programming: Front panel keypad or EIA RS485 interface
Communications: RS485, half duplex
Memory backup: Non-volatile EEPROM,no battery

required
Program Setting: 2 events per day with 7 days per
week and 2 holiday schedules (12 periods of up
to 99 days each)
Override: Programmable from 0 to 255 minutes

Environmental

Operating temperature: 32 to 131°F (0 to 55°C)
Operating humidity: 0 to 100% RH, noncondensing
Storage temperature: 14 to 140°F (-10 to 60°C)

Electrical

Supply voltage: 24 VAC +/- 20%
Inputs: Built-in and remote platinum RTDs,

momentary override and three digital (dry contact)
Range: Room Temp: 40 to 90°F (built-in or remote)
Outdoor Air Temp: -40 to 160°F (remote)
Discharge Air Temp: 0 to 150°F (remote)
Outputs: Five digital (SPST dry contact, 24 VAC
@ 2 A), one 4-20 mA DC analog

Max. Load Resistance (analog output): 600 Ω
Common mode rejection: 100 db @ 60 Hz
Power Consumption: 8 VA max.

Specifications subject to change without notice.

2800 LAURA LANE • MIDDLETON, WI 53562 • [phone] • FAX [phone] • www.tcsbasys.com

1

R

3.88

[98.6]

7.13

[181.1]

1.47

[37.3]

MON

72F

04:54PM

Specification Suggestions

Microprocessor-based room thermostats shall have
a built in keypad and display for programming and
scheduling, and utilize a 365 day time clock with four
setback intervals per day. Thermostats shall be of
the low voltage type.

Thermostats shall have a limited temporary setpoint
adjustment, definable in programming, and a local
override button with remote override capability. The
status of all inputs and outputs shall be monitored
locally through the use of the keypad and display.
Thermostats shall support outdoor air temperature
heating and cooling lockouts, fan proving, and
be able to monitor filter status. Thermostats shall
be capable of modulating a heating device, a
cooling device or an economizer based on outdoor
air temperature and cooling demand, and shall
modulate the outdoor air dampers shut when a
discharge air low limit temperature setpoint is
reached. An adjustable delay on power up shall be
available for soft start of systems on power loss.

Thermostats shall support a setpoint shift feature
in which a digital input is used to shift the heating
setpoint down and the cooling setpoint up by an
adjustable amount. All system and fan switching
shall be done through the microprocessor and must
allow for disabling. The ability to edit operating
control parameters shall be password protected
via a user-definable security access code. The
thermostat housing shall be off-white or white and
mounted 60" above the finished floor. The keypad,
unoccupied override and RS485 communications
jacks shall be accessible, without requiring the
removal of the housing. Thermostats must support
non-volatile memory, so that in the event of power
loss, all programmed operating parameters shall
be unaffected without the use of battery backup.
All control functions shall continue in the event of a
communications failure.

Ordering Information

Part No. Description

SZ1041A Programmable 365-day thermostat
for make up air units with modulating
output

SZ1041A Accessories
TS2000 Remote sensor, room mount
TS3000 Remote sensor, room mount,
decorator style
TS1002 Remote sensor, duct mount
TS1003 Remote sensor, outdoor mount
PD Series Differential pressure switches
PO Series Occupancy sensors
PR Series Encased relays
PS Series Current switches
PT Series Control transformers

Dimensions

SZ1041A Note: inches [mm]

Thermostats shall provide both remote and local
communications in accordance with EIA RS485
standards. All firmware communications protocol
and command codes shall be published, open and
non-proprietary. Room thermostats shall be model
SZ1041A as manufactured by TCS/Basys Controls.

2800 LAURA LANE • MIDDLETON, WI 53562 • [phone] • FAX [phone] • www.tcsbasys.com

Rev:0211

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