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Lists system components required for proper operation of the W7100G.
Lists optional accessories available for the W7100G controller.
Guidance on selecting a location and physically mounting the controller.
Details the W7100G wiring and hookup diagram for system connections.
Explains how to configure the controller for a specific number of cooling stages.
Describes the W7100G's control logic for stable discharge water temperature.
Discusses adjusting setpoints based on space or outdoor air conditions.
Illustrates the algorithm for setpoint reset based on space temperature readings.
Covers using outdoor air temperature for setpoint reset and associated wiring.
Explains the function and meaning of the W7100 controller's status LEDs.
Details methods to adjust outdoor air reset start/stop temperatures using resistors.
Provides typical setpoint ranges for HVAC and industrial applications.
Offers recommendations for reset ranges in HVAC applications.
Explains how to set the control band for optimal system response and stability.
Details jumper settings to select minimum ON/OFF timings (30 or 60 seconds).
Instructs on selecting and installing resistors to define the number of controlled stages.
Lists system components required for proper operation of the W7100G.
Lists optional accessories available for the W7100G controller.
Guidance on selecting a location and physically mounting the controller.
Details the W7100G wiring and hookup diagram for system connections.
Explains how to configure the controller for a specific number of cooling stages.
Describes the W7100G's control logic for stable discharge water temperature.
Discusses adjusting setpoints based on space or outdoor air conditions.
Illustrates the algorithm for setpoint reset based on space temperature readings.
Covers using outdoor air temperature for setpoint reset and associated wiring.
Explains the function and meaning of the W7100 controller's status LEDs.
Details methods to adjust outdoor air reset start/stop temperatures using resistors.
Provides typical setpoint ranges for HVAC and industrial applications.
Offers recommendations for reset ranges in HVAC applications.
Explains how to set the control band for optimal system response and stability.
Details jumper settings to select minimum ON/OFF timings (30 or 60 seconds).
Instructs on selecting and installing resistors to define the number of controlled stages.
The Honeywell W7100G Discharge Water Temperature Control is a microprocessor-based device designed to maintain an average discharge water temperature for reciprocating chiller applications. It achieves this by staging on and off compressors or unloaders as required. The W7100G can manage up to six stages of cooling independently and can be expanded to control up to ten stages when used with a W7101A Satellite Sequencer.
The W7100G utilizes an advanced proportional-plus-integral (PI) microprocessor control algorithm to minimize temperature droop, ensuring precise and stable temperature control. It employs an integrating control band concept, which matches the required operating capacity to the chiller load and minimizes offset from the control setpoint. This control band is adjustable from 0 to 10°F (0 to 6°C) and is centered on the discharge water setpoint, allowing for stabilization of system operation.
The controller features a soft start function to reduce compressor cycling during system startup. It also offers adjustable minimum on/off timing and time delay between stages, configurable for either 30 or 60 seconds. These timings are crucial for protecting compressors from damage due to short cycling.
The W7100G's setpoint is adjustable from 10 to 110°F (-12 to 43°C). It supports a reset function for the discharge water temperature setpoint, which can be based on either space or outdoor air temperatures. This reset function, adjustable from 5 to 20°F (3 to 11K), helps save energy under lighter loading conditions by adjusting the setpoint upward as average space temperature drops or downward as outdoor air temperature rises. For space reset, multiple sensors (e.g., T7047C1025) can be used to measure average space temperature, with the reset potentiometer set at the lowest desired cooling temperature. Outdoor air reset (using a C7031G1016 sensor) adjusts the setpoint based on outdoor air temperature, with modifications possible using series and parallel resistors to define T-High (no reset) and T-Low (full reset) points.
The number of controlled stages is determined by a fixed resistor value placed across terminals 7 and 8 on the W7100G. This resistor informs the controller of the total number of cooling stages to be managed, influencing its control behavior. LED indicators on the W7100G light up simultaneously with the energization of each stage relay, providing visual feedback on system operation.
General| Brand | Honeywell |
|---|---|
| Model | W7100G |
| Category | Temperature Controller |
| Language | English |
