Programmable 7-Day Modulating Thermostat
The SZ1017a has a 7-day time clock and is
designed for applications with modulating heating or
• Stand-alone or network operation • 7-day time clock • Discharge air sensor input with high and low limits and reset • Discharge air heating low limit • Midpoint or endpoint modulation • Outdoor air sensor input with heating & cooling lockout • Up to two stages for heating and/ or cooling and a modulating heating or cooling output • Midpoint or endpoint modulation • Adjustable delay on start-up and power-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 • Auxiliary time clock output (economizers) • 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
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Specs & Docs
General Accuracy: +/- 1ºF at 75ºF 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 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: Four digital (SPST dry contact, 24 VAC @ 2 A), one 4-20 mA DC analog Max. Load Resistance (analog output): 600Ω Common mode rejection: 100 db @ 60 Hz Power Consumption: 8 VA max.Specifications subject to change without notice.