PC702 Two Stage Boiler Reset Control
Microprocessor-based control.
Regulates supply water temperature from two-stage boiler system.
The PC702 Two Stage 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. The PC702 Two Stage Boiler Reset Control offers all the features of the PC700 and in addition includes an adjustable inter-stage relay setting, boiler staging using proportional, integral and derivative (PID) logic, optional boiler rotation and a domestic hot water demand output.
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Performance Data
Boiler Start — 35 to 150°F (2 to 66°C) Factory: 70°F (21°C)
Outdoor Start — 35 to 85°F (2 to 29°C) Factory: 70°F (21°C)
Boiler Design — 70 to 220°F (21 to 104°C) Factory: 190°F (88°C)
Outdoor Design — -60 to 32°F (-51 to 0°C) Factory: 10°F (-12°C)
Boiler Minimum — Off, 80 to 180°F (Off, 27 to 82°C) Factory: 140°F (60°C)
Differential — Auto, 2 to 42°F (Auto, 1 to 24°C) Factory: Auto
Interstage Delay — 0:30 to 4:00 minutes Factory: 2:00 min.
WWSD — 35 to 100°F, Off (2 to 38°C, Off) Factory: 70°F (21°C)
Units — °F, °C Factory: °F
Features
- Control — Microprocessor PI control; This is not a safety (limit) control
- Packaged weight — 1.5 lb. (670 g)
- Dimensions — 4-3/4” H x 2-7/8” W x 7/8” D (120 x 74 x 22 mm)
- Approvals — CSA NRTL /C; Meets ICES & FCC regulations for EMI/RFI
- Ambient conditions — Indoor use only, 32 to 105°F (0 to 40°C), < 90% RH noncondensing
- Power supply — Class 2, 24 V ±10% 50/60 Hz 3 VA (Powered by Taco -Exp Control) Relays — 24 V (ac) 5 A 1/6 hp, pilot duty 240 VA
- DHW Demand — 20 to 260 V (ac) 2 VA
- NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
- Outdoor Sensor M 2036 and Universal Sensor 071.
Applications
- Microprocessor-based control. Regulates supply water temperature from two-stage boiler system.
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