Caleffi Series 257 iSolar Plus Multi-functional Temperature Differential Controller
The iSolar™ 257 series are multi—functional temperature differential controllers
that provide complete control of the solar thermal system for safe
and long—lasting operation. The microprocessor based controller monitors
and controls thermal solar systems by means of a collector sensor and a
storage tank sensor. The controllers also perform important system monitoring
and safety functions. The system parameters and measured values can
be changed and viewed on the large LCD display. The controller is equipped
for up to four temperature sensor inputs and one or two 120 VAC outputs
(some models) for activating the solar circuit pump and second 120 VAC
output for activating a valve or second pump. The controller is additionally
equipped with VBus® for two-way communication between modules, PC’s
or data loggers.
Caleffi Series 257 iSolar BX Multi-functional Temperature Differential Controller
The iSolar™ BX is a multi-functional temperature differential controller with
add-on system functions for use in a wide variety of solar thermal heating
applications. iSolar™ BX is equipped with four relay outputs; three triac
pump speed control relays and one standard relay. These outputs include
two pulse width modulation (PWM) outputs that enable energy conservation
measures for high-effi ciency direct current (DC) pumps. The controller
is equipped with fi ve Pt1000 sensor inputs, two analog Grundfos sensor
inputs, and one impulse fl ow meter input. Twenty six system confi guration
options are predefi ned for control of a standard solar water heating system,
drainback systems, supplemental space heating, multiple storage tanks,
heat dump and storage tank booster heating.
Johnson Controls Single Stage Digital Temperature Control (120/240v SPDT)
The A419 series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw (SPDT) output relay. They feature a lockable front-panel touchpad for setup and adjustment, and a Liquid Crystal Display (LCD) for viewing the temperature and status of other functions. A Light-Emitting Diode (LED) indicates the controls? output relay On/Off status. The A419 controls are available in 24 VAC or 120/240 VAC powered models. The A419 controls have heating and cooling modes, adjustable setpoint and differential, an adjustable anti-short cycle delay, and a temperature offset function. The setpoint range is -30 to 212°F (-34 to 100°C). The controls feature remote sensing capability and interchangeable sensors. The A419 controls are available in either NEMA 1, high-impact plastic enclosure suitable for surface or DIN rail mounting or NEMA 4X watertight, corrosion-resistant surface-mount enclosures.
Johnson A419GBF-1C 24VAC Single Stage Temperature Control
The A419 series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw (SPDT) output relay. They feature a lockable front-panel touchpad for setup and adjustment, and a Liquid Crystal Display (LCD) for viewing the temperature and status of other functions. A Light-Emitting Diode (LED) indicates the controls? output relay On/Off status. The A419 controls are available in 24 VAC or 120/240 VAC powered models. The A419 controls have heating and cooling modes, adjustable setpoint and differential, an adjustable anti-short cycle delay, and a temperature offset function. The setpoint range is -30 to 212°F (-34 to 100°C). The controls feature remote sensing capability and interchangeable sensors. The A419 controls are available in either NEMA 1, high-impact plastic enclosure suitable for surface or DIN rail mounting or NEMA 4X watertight, corrosion-resistant surface-mount enclosures.
