SZ2161
Heat Pump Water Loop Controller
Description
The SZ2161 is a microprocessor-based controller designed for water source heat pump plant control applications.
Features:
- 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 input
- 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
- 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
Call to order:
1-800-288-9383
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.