Heat Pump Water Loop Controller
SZ2161Description
The SZ2161 is a microprocessor-based controller used to control water loops in heat pump-based plant control applications.
Inputs:
Six 1000Ω PtRTD, momentary override and five digital (dry contact)
- 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 temperature: –40 to 160°F
Outputs:
- Twelve digital (SPST dry contact, 24 VAC @1A) analog
- Two 4 –20mA DC
Features
- Stand-alone or network operation
- 365-day time clock with two holiday schedules
- Supply-and-return condensers for 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
- Digital outputs for control of dampers, pumps, boiler stages, and mixing valves
Specs & Docs
Specifications:
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.
