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PC705 Variable Speed Pump Mixing Control

PC705 Variable Speed Pump Mixing Control
Regulates Supply Water Temperature to Heating System, Simultaneously Controls Boiler and Injection Pump Speed

Use the PC705 Variable Speed Pump Mixing Control to regulate the supply water temperature to a heating system by simultaneously controlling a boiler and the speed of an injection pump. Based on the outdoor air temperature, the PC705 Variable Speed Pump Mixing Control continuously adjusts the boiler differential to optimize the firing cycles of the boiler, prevent large water temperature swings and increase the efficiency of your system. As the heating load changes, the Taco Mixing Control automatically adjusts the injector circulator, increasing its speed as load increases and slowing it with a decreasing load.

Instruction Sheet
Submittal Data
Visio Zone Control Stencils
Zone Control Wiring Guide
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Performance Data
MIX Start: 35 to 150°F (2 to 66°C)
Factory: 70°F (21°C)

OUTDR Start: 35 to 85°F (2 to 29°C)
Factory: 70°F (21°C)

MIX DSGN: 70 to 220°F (21 to 104°C)
Factory: 120°F (49°C)

OUTDR DSGN: -60 to 32°F (-51 to 0°C)
Factory: 10°F (-12°C)

MIX MAX: 80 to 225°F (27 to 107°C)
Factory: 180°F (82°C)

BOIL MIN: OFF, 80 to 180°F (OFF, 27 to 82°C)
Factory: 140°F (60°C)

WWSD: 35 to 100°F, OFF (2 to 38°C, OFF)
Factory: 70°F (21°C)

Unit: °F, °C
Factory: °F

  • Ambient conditions: Indoor use only, 32 to 104°F (0 to 40°C), < 90% RH non-condensing.
  • Power supply: 24 V (ac) ±10% 50/60 Hz 3 VA
  • Variable Pump: 120 V 50/60 Hz 2.4 A 1/6 hp
  • Pump Relay: 120 V (ac) 5 A , 1/3 hp, pilot duty 240 VA
  • Boiler Relay: 24 V (ac) 5 A 1/6 hp, pilot duty 240 VA

Sensors Included:

  • NTC thermistor, 10 kW @77°F (25°C ±0.2°C) ß=3892
  • Outdoor Sensor M 2036 and 2 of Universal Sensor 071
  • Hot Water Heating Systems
  • Closed Cooling Circuits
  • Air Conditioning Systems
  • Hydronic Heating & Cooling
  • Water/Glycol concentrations up to 50%
  • Solar / Geothermal
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