TCS SZ1051 Modulating Thermostats

Description

The SZ1051 are microprocessor-based programmable thermostats designed to control air handling units with modulating economizers and/or modulating heating or cooling. The SZ1051 have a 365-day time clock

Features and benefits

• Stand-alone or network operation • 365-day time clock with one holiday schedule with automatic leap year and daylight savings correction • Discharge air sensor input with high and low limits (and reset with the SZ1053) • Discharge air heating low limit • Outdoor air sensor input with heating & cooling lockouts (and economizer operation with the SZ1051) • Two stages for heating and/or cooling • Modulating outputs for heating and/or cooling • Adjustable delay on power-up and start-up for soft starts • P+I control option on digital stages • Smart Recovery • 32 character LCD display • Six status LEDs • Remote room sensing capability • User setpoint adjustment limits • Local override and remote override capability • System and fan switching with access lockouts • Auxiliary time clock output • 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 • Digital enthalpy switch input for economizer enable on the (SZ1051)

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.