· Up to 2 stages for heating and/or cooling and a modulating heating or cooling output
· Discharge air sensor input with high and low limits and reset
· Outdoor air sensor input with heating & cooling lockout
Instructions Submittal Data
Sample Control Spec.
Microprocessor-based room thermostats shall have a built in keypad and display for programming and scheduling, and utilize a 7 day time clock with two 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, discharge air temperature high and low limits, fan proving, and be able to monitor filter status. Thermostats shall utilize one modulating output for heating or cooling. 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.
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 SZ1017a as manufactured by TCS Basys Controls.