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General| Brand | Honeywell |
|---|---|
| Model | T775B2040 |
| Category | Controller |
| Language | English |
Lists sensors, humidity sensors, pressure sensors, universal sensors, and accessories.
Explains how integral action minimizes droop and hunting by summing offset errors.
Describes derivative action opposing changes and providing corrective action based on rate of change.
Clarifies differential for relays and throttling range for modulating/floating outputs.
Explains setting an irreversible maximum setpoint limit for specific local code compliance.
Explains T775B control for loop water temp in heat pump systems, including alarms.
Details programming for boiler, low temp alarm, cooling, and high temp alarm relays.
Describes T775B sump water control for chillers, including freeze protection.
Outlines programming for spray water pump, fan control, and sump freeze protection relay.
Details T775B control of discharge water temp for rotary compressors, using solenoid valves.
Shows programming for compressor stages controlling solenoid valves for slide valve positioning.
Explains T775B2040 control of cooling tower fan speeds and cold weather shutdown.
Details programming for sump temp-based fan speeds and outdoor temp-based cutoff.
Describes T775 control of devices like fans or pumps based on a daily time schedule.
Shows how to program a relay for timed operation of a fan, pump, or other device.
Explains T775M control of actuators to modulate dampers or valves based on temperature.
Details programming for modulating output to control an actuator via setpoint and throttling range.
Describes T775R control of boiler water temp with two stages using a reset curve.
Shows how to program reset curves and setpoint offsets for boiler discharge temperature.
Explains T775R control of chiller water temp using a reset curve and offsets for multiple stages.
Details programming for a reset curve to control chiller water temperature based on outside air.
Describes T775P multistage boiler control using discharge water temp and a primary pump relay.
Shows programming for stages, pump control, alarms, and temperature setpoints.
Explains T775P multistage boiler control with reset based on discharge water temperature.
Details programming for reset curves, stages, and pump control for boiler systems.
Describes T775P multistage chiller control based on discharge water temp, using a pump relay.
Shows programming for chiller stages, pump control, and low alarm settings.
Details T775P control of multistage boilers with pump output using an expansion module.
Outlines programming for 4 stage boiler control, pump output, and reset curves.
Explains T775L control for reciprocating chillers with freeze protection and low temp cutoff.
Shows programming for chiller cooling stages and freeze protection using sensors.
Describes T775L control for multiple boilers and multistage cooling using different sensors.
Details programming for staged heating and cooling loops with separate setpoints and ranges.
Explains T775U control of duct pressure via fan speed using a VFD and pressure sensor.
Shows programming for pressure sensor input and a 4-20mA PID modulating output to the VFD.
Describes T775U control of an outside air damper based on CO2 sensing input for air quality.
Details programming for CO2 sensor input and setting units for ppm.
Explains T775L two-stage cooling based on zone temp, using outside air temp for reset.
Shows programming for zone air temp reset using a reset curve based on outdoor temperature.
Details T775R control of discharge air temp based on return air temp using a reset curve.
Shows programming for discharge temp setpoint modulation based on actual return air temperature.
Explains T775R as a differential controller for solar water heating, regulating circulation pump.
Details programming for pump turn-on/off based on differential, high limit, and low limit.
Describes T775R maintaining differential temp between room and outside air for free heating/cooling.
Shows programming for cooling and heating engagement based on temperature delta and reset curves.
Illustrates replacing a W973A Logic Panel with a T775M2030 for two-stage Heat/Cool control.
Shows wiring connections for the W973A Logic Panel as a pre-existing control.
Explains replacing a W964F Aquatrol Panel with a T775R for floating actuator control.
Displays wiring connections for the W964F Aquatrol Panel as a pre-existing control.
Illustrates replacing an S984 Step Controller with a T775L using an expansion module.
Shows wiring connections for the S984 Step Controller as a pre-existing control.
Explains replacing a W7100C controller with a T775L for two-stage heat and four-stage cool.
Displays wiring connections for the W7100C Discharge Air Controller as a pre-existing control.
Lists T775 electronic replacements for Johnson System 350 controls, detailing features and specs.
Provides a cross-reference for Honeywell controls to T775 electronic replacements, listing features.
Lists T775 electronic replacements for White Rodgers controls, including temperature ranges and features.
Provides a cross-reference for Barber Colman controls to T775 electronic replacements, detailing features.
Lists T775 electronic replacements for Ranco controls, matching various model numbers.
Compares features of Tekmar models with various T775 electronic controllers, highlighting differences.
