Taco PC702-1 Boiler Reset Control, 2-Stage

Taco PC702-1 Boiler Reset Control is a microprocessor-based control designed to regulate the supply water temperature from a two-stage boiler system based on the outdoor temperature or domestic hot water requirements.

Taco PC702-1 offers all the feature of the PC700 and in addition includes an adjustable interstage relay setting, boiler staging using proportional, integral and derivative (PID) logic, optional boiler rotation and a domestic hot water demand output.

Taco PC702-1 includes functions such as automatic reset ratio calculation, Warm Weather Shut Down (WWSD), Minimum Boiler setting, adjustable interstage delay setting, optional boiler rotation, and an optional automatic boiler differential. The control has a digital, liquid crystal display (LCD) that nor-mally displays the Boiler Supply temperature, but can display other temperatures and settings.

Also included in the package: Input (Boiler) Sensor and Output (Outdoor) Sensor.

Technical Specifications:

Control: Microprocessor PI control; This is not a safety (limit) control;
Weight: 1.5 lbs;
Dimensions: 4-3/4” H x 2-7/8” W x 7/8” D;
Approvals: CSA NRTL /C; Meets ICES & FCC regulations for EMI/RFI;
Ambient conditions: Indoor use only, 32 to 105°F, < 90% RH non-condensing;
Power supply: Class 2, 24 V ±10% 50/60 Hz, 3 VA (Powered by Taco Expandable Control);
Relays: 24 V (AC) 5 A 1/6 hp, pilot duty 240 VA;

DHW Demand: 20 to 260 V (AC) 2 VA;

Sensors included: NTC thermistor, 10 kΩ @ 77°F ß=3892 & Outdoor Sensor M 2036 and Universal Sensor 071;

Boiler Start: 35 to 150°F (70°F Factory Setting);
Outdoor Start: 35 to 85°F (70°F Factory Setting);
Boiler Design: 70 to 220°F (190°F Factory Setting);
Outdoor Design: -60 to 32°F (10°F Factory Setting);
Boiler Minimum: Off, 80 to 180°F (140°F Factory Setting);
Differential: Auto, 2 to 42°F (Factory Setting: Auto);
Interstage Delay: 0:30 to 4:00 minutes (2:00 min Factory Setting);
WWSD: 35 to 100°F, Off (70°F Factory Setting);
Units: °F, °C;

Documentation:

Instruction Sheet for Taco PC702-1 Boiler Reset Control (pdf)

Application Guide for Taco PC702 Outdoor Boiler Reset Control (pdf)