SZ2166
Chiller Controller
Description
The SZ2166 is a microprocessor based chiller controller. It is designed for use on multi-stage chiller applications and includes boiler support and control.
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
- Hot water supply and return temperature inputs
- Chilled water supply and return temperature input
- Two digital outputs for boilers
- One digital output for alarm
- Mixed water temperature input
- Outdoor air temperature input
- Separate set point for thermal storage sequence
- Outdoor air reset control
- Two digital inputs for pump status
- External time clock input
- Six digital outputs for chillers, pumps and chiller stages
- Adjustable offsets and differentials on digital outputs
- Lead/Lag sequencing of up to six chillers
- 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 chiller and boiler stages
- Pump lube feature
- Local and remote override capability
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, noncondensing
Storage temperature: 14 to 140°F (-10 to 60°C)
Electrical
Supply voltage: 24 VAC +/-20%
Inputs: Six 1000 Ω PtRTD, momentary override and five digital (dry contact)
Range: Chilled water supply and return: 0 to 100°F
Hot water supply and return: 40 to 240°F
Mixed water: 20 to 220°F
Outdoor air: -40 to 160°F
Outputs: Nine digital (SPST dry contact, 24 VAC @ 2A) and two 4 to 20 mA DC analog
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.