Description
Control Description
The Difference Setpoint Control 157 is designed to operate a variable speed pump to transfer heat from a heat source to a storage tank. Varying the speed of the pump provides fast and accurate temperature control to maintain the target temperature difference (ΔT). Additional minimum and maximum setpoints turn off the pump when heat transfer is no longer desirable. Potential applications include using solar collectors or a wood boiler as a heat source.
  • Control: Microprocessor control; This is not a safety (limit) control
  • Packaged Weight: 1.5 lb. (670 g), Enclosure C, White PVC plastic
  • Dimensions: 4-3/4" H x 2-7/8" W x 7/8" D (120 x 74 x 22 mm)
  • Approvals: CSA certified to CSA C22.2 #142-M and UL # 508
  • Ambient Conditions: Indoor use only, -20 to 120°F (-30 to 50°C), < 90% RH non-condensing
  • Power Supply: 24 V ±10% 50/60 Hz 3 VA
  • Variable Pump: 120 V (ac) 2.4 A 1/6 hp, fuse T2.5 A 250 V
  • Pump 2: 120 V (ac) 5 A 1/3 hp, pilot duty 240 VA
  • Demand: 24 V (ac) 2 VA
  • Sensors Included: NTC thermistor, 10 komega @ 77°F (25°C ±0.2°C) ß=3892 Two of Universal Sensor 071
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Specs
Type:
Variable Speed
Application:
Alternative Energy
Width:
2-7/8"
Height:
4-3/4"
Stages:
Difference Setpoint
User Interface:
Push Button
LCD
Voltage:
24v
Depth (Inches):
7/8"
Ambient Conditions:
Indoor Only: -20°-120°F < 90% RH non-condensing
Power Supply:
24V
Min Temp (F):
-30°F
Temperature Range (F):
-30°-300°F
Max Temp (F):
300°F
Control:
Microprocessor Control
Sensors:
NTC Thermistor 10 k ohm @ 77°F
Enclosure Type:
C
Weight (lbs):
1.5 lbs
Demands:
24 V (ac) 2 VA
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