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TCS SZ2161 Heat Pump Water Loop Controller

Heat Pump Water Loop Controller 6 RTD inputs, 5 digital inputs, 2 analog outputs, 12 digital outputs
Availability: In stock


The SZ2161 is a microprocessor-based controller designed for water source heat pump plant control applications.


• 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

• Supply and return condenser water temperature inputs

• Supply and return loop water temperature inputs

• Outdoor air temperature input

• Boiler supply water temperature input

• Four digital inputs for status

• External time clock input

• Local override and remote override capability

• 12 digital outputs for control of

• damper

• spray pump

• 2 loop pumps

• 2 boiler pumps

• 2 fan speed selections

• 4 boiler stages

• Adjustable offsets and differentials on relay outputs

• Two modulating analog output for speed drive or boiler

• Mixing valve control

• LEDs for monitoring status

• Automatic rotation of pumps

• Automatic rotation of boiler stages


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 1000Ω PtRTD, momentary override and five digital (dry contact)
Range: Loop water supply and return: 20 to 120°F Condenser water supply and return: 20 to 120°F
Boiler water: 40 to 240°F
Outdoor air temp: -40 to 160°F
Outputs: 12 digital (SPST dry contact, 24 VAC @2A) analog and Two 4 to 20 mA DC
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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