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TCS SZ2165 Boiler Controller

Boiler Controller 6 RTD inputs, 5 digital inputs, 2 analog outputs, 9 digital outputs
Availability: In stock


The SZ2165 is a microprocessor based boiler controller. It is designed for use on multi-stage boiler applications and includes chiller support and control.


• Stand-alone or network operation

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

• No backup battery required for control parameters, schedule or clock

• Hot water supply and return temperature inputs

• Chilled water supply and return temperature inputs

• Two digital outputs for chillers

• One digital output for alarm

• Mixed water temperature input

• Outdoor air temperature input

• Outdoor air reset control

• Two digital inputs for pump status

• External time clock input

• Local override and remote override capability

• Six digital outputs for boilers, pumps and boiler stages

• Adjustable offsets and differentials on digital outputs

• Lead/Lag sequencing of up to four boilers

• Analog input for pressure control

• Two modulating analog outputs for valves and VFDs

• Adjustable P+I+D control on modulating outputs

• LEDs for monitoring status

• Automatic rotation of pumps

• Automatic rotation of boiler and chiller stages

• Domestic hot water function

• Pump lube feature

• Selectable normally open or normally closed relay outputs


General Accuracy: +/- 0.5%
Programming: EIA RS485 interface
Communications: RS485, half duplex
Memory backup: Non-volatile EEPROM, no battery required
Environmental Operating temperature: 32 to 131°F (0 to 55°C)
Operating humidity: 0 to 100% RH, non-condensing
Storage temperature: 14 to 140°F (-10 to 60°C)
Electrical Supply voltage: 24 VAC +/-20%
Inputs: Six 1000 Ω PtRTD, momentary override, five digital (dry contact) and one 4 to 20 mA DC analog
Range: Hot water supply and return: 40 to 240°F
Chilled water supply and return: 0 to 100°F
Mixed water: 20 to 220°F
Outdoor air: -40 to 160°F
Outputs: Nine digital (SPST dry contact, 24 VAC @2 A) and Two 4 to 20 mA DC analog
Analog input impedance: 250 Ω
Max. load resistance (analog output): 600 Ω
Common mode rejection: 100 db @ 60 Hz
Power consumption: 15 VA max.
Specifications subject to change without notice.

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