T775 Series 2000 Electronic Stand-Alone Controllers APPLICATION GUIDE AND CROSS REFERENCE 63-7147—3
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS IMPORTANT The T775R is an operating control, not a limit or safety control. If used in applications requiring safety or limit controls, a separate safety or limit control device is required. TABLE OF CONTENTS T775 Application Tips .....................................................3 Compatible Components ...............................................3 Temperature Sensors....................................................
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775 APPLICATION TIPS COMPATIBLE COMPONENTS Q Does the T775 save programmed values if the power is lost? Temperature Sensors1 The controller accepts 1,097 Ohms PTC at 77° F (25° C): • 50021579-001 – Standard sensor (included with all models except T775U2006 and NEMA 4X models) • T775-SENS-STRAP – Strap on sensor with wiring box • T775-SENS-WR – Water resistant with 5 foot leads (included with NEMA 4X models) • T775-SENS-WT – Watertight with 6 foot lead
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS 1 FEATURES See form 62-0265 - Temperature Sensor for the T775 Series 2000 Stand-alone Controller In Table 1, a check mark (!) indicates that the controller model has this feature. A number indicates the quantity (e.g., the T775M2030 has 4 standard SPDT relay outputs), and “n/a” indicates the feature is not applicable to that controller model.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Table 1. T775 Controller Features by Model Number.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775 OPERATIONS Integral Action Differential vs. Throttling Range “Droop” and equipment hunting can be minimized by summing (integrating) the offset errors over time and adding this correction to the output voltage. Differential is used for relay outputs, and throttling range is used for modulating outputs. A non-zero value for the integral time will allow the controlled temperature to try and reach the setpoint value.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Reset Programming (T775L, T775P, T775R, and T775U models only) Choose Reset = NO for any outputs you do not wish to reset, then press the HOME button to record your selection. To program an output for reset, refer to the values as shown in the example below and in Fig. 1. Choose your own appropriate values for Sensor A maximum and minimum and Sensor B maximum and minimum. NOTES: 1.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775 APPLICATIONS Water Source Heat Pump Loop Water Controller – T775B Relay 4: High temperature alarm circuit Program for: — Cool — Setpoint = 95° F (35° C) — Differential = 1° F (-17° C) Application Description Water is circulated in a loop to remove waste heat and to provide cooling from a multiple heat pump system.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Chiller – T775B Application Description As the water temperature in the sump rises, the T775B sequentially cycles on the spray pump valve and two relays of fans. If the water temperature in the sump drops below 40° F (4° C), the T775B energizes a sump dump drain valve to prevent system freeze up.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Chiller, Rotary Compressor – T775B SENSOR A (DISCHARGE WATER) T T Application Description The T775B is controlling the discharge water temperature of a rotary compressor. The T775B provides an optional low temperature or low pressure cut-out circuit. T775B NOTE: T775R reset models can also be used in this application.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Cooling Tower Control – T775B2040 Wiring All output relays should have a common power wiring source, which may or may not be the same as the T775 power wiring Application Description The T775B2040 is controlling a cooling tower fan, based on two sensor inputs, to control the low and high fan speeds and provide cold weather shutdown.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Time-based Control of Fan, Pump, etc. – T775 (all models) NOTE: Keep in mind that if the scheduler is energized, all relays will follow the time schedule. If you do not want some outputs to go into a setback mode, choose Scheduler = NO for those outputs, or program the setpoint and setback to the same temperature.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Damper or Valve Modulation – T775M or T775R MS75xx SPRING RETURN DIRECT COUPLED ACTUATOR (DCA) Application Description WIRING STRIP In this example, a T775M is controlling an actuator, based on temperature input, to modulate a damper or valve. L1 (HOT) 1 1 L2 2 Sensor Designation 3 This device application requires one sensor. • Sensor A is sensing outside temperature SENSOR A 4 NOTE: Sensor A or Sensor B can be used in this application.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Hot Water Reset – T775R Application Description The T775R is controlling the boiler water temperature with two stages (relays), based on outside temperature using a reset curve and an offset for relay 2. MENU PROGRAM RELAY 2 OFFSET MENU PROGRAM RELAY 2 PROGRAM RELAY 2 OFFSET DIFFRNTL HEAT/COOL SETBACK EXIT Sensor Designation -10 This device application requires two sensors. • Sensor A is sensing hot water discharge temperature of the boiler.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Hot Water Reset (continued) Device Checkout The T775 performance can be checked out to determine if proper operation exists. Wiring All output relays should have a common power wiring source, which may or may not be the same as the T775 power wiring. SENSOR A (HOT WATER DISCHARGE) SENSOR B (OUTSIDE AIR) NOTE: The alternate Home screens do not show live updates of the sensor temperature.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Chilled Water Reset – T775R Application Description The T775R is controlling the chiller water temperature, based on outside temperature using a reset curve. Multiple stages can also be controlled by using an offset from the main setpoint for the subsequent relay outputs. When enabling multiple stages for reset, each stage can have its own programmable offset from relay 1 (stage 1). Sensor Designation This device application requires two sensors.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Chilled Water Reset (continued) 1. Device Checkout 2. The T775 performance can be checked out to determine if proper operation exists. From the Home screen, use the $ button to verify the setpoint temperature for each output. Then, press the HOME button to view the actual outside air temperature (sensor B).
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Multi-Stage Boiler Control (No Reset) – T775P Refer to the staging diagram in Fig. 18 for individual stage behavior. STAGES Application Description STAGE 3 ON The T775P is providing multistage boiler control based on the boiler's discharge water temperature. The T775P uses the fourth output relay to energize the primary pump. HYST. Sensor Designation STAGE 1 1 NOTE: Control can be to either sensor A or C.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Multi-Stage Boiler Control (Reset) – T775P IMPORTANT After the desired value is selected, be sure to press the # or $ or HOME button in order to save that value in the controller’s memory. Application Description The T775P is providing multistage boiler control based on the boiler's discharge water temperature. The T775P uses the fourth output relay to energize the primary pump.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Multi-Stage Boiler Control (Reset) (continued) NOTE: Control can be to either sensor A or C. Operation In this 3-stage example, as the cooling load increases, additional stages of cooling will cycle ON as the chiller water temperature increases. The T775P will stage three chillers to provide sufficient cooling. See Fig. 23 for staging behavior.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Wiring All output relays should have a common power wiring source, which may or may not be the same as the T775 power wiring.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS — STG8/Pump: (Relay 8 controls the pump output)1 Enable = YES Exercise = YES or NO Prepurge = -300 to 300 seconds (default is 0) Postpurge = 0 to 300 seconds (default is 0) IMPORTANT By programming the boiler setpoint at 210° F (-99° C) the T775 has established 210° F (-99° C) as the highest operating point that will be allowed when the temperature falls below 20° F (-7° C).
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS 4 Stage with Pump Output and Reset (continued) Wiring All output relays should have a common power wiring source, which may or may not be the same as the T775 power wiring.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS 3 Stage Reciprocating Chiller – T775L SENSOR A (RETURN WATER) SENSOR B (DISCHARGE WATER) Application Description The T775L is controlling the return water in a reciprocating chiller with fast-dump freeze protection, low temperature cutoff, and optional low pressure cutoff. T T T775L T T Sensor Designation This device application requires two sensors. • Sensor A is sensing return water and controlling three stages of cooling.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS 4 Stage Heat and 6 Stage Cool – T775L Application Description The T775L is providing control for four boilers based on the boiler's discharge water temperature and providing multistage cooling control. NOTE: The T775L (with up to two expansion modules) can control any number of heating and cooling stages up to a maximum of 12 stages.
SENSOR B SENSOR A T T T T 1 T T T T T775L FIRST T775S – + 1 – + SECOND T775S 2 1 – + – + 3 L1 (HOT) 24 VAC C HEAT 4 26 HEAT 1 + C RELAY 4 COM NO NO COM NC C NO NC C NO NO C NC RELAY 1 HEAT 2 HEAT 3 4 RELAY 3 + COM NO NO COM NO C NC RELAY 2 NC C NO NC C NO NO C NC COM NO NO + 4 120 VAC RELAY 12 RELAY 7 RELAY 5 COM C 4 120 VAC RELAY 8 120 COM 240 L1 (HOT) L2 5 NO C NC RELAY 6 COOL NO 1 NO COOL 2 RELAY 11 NC C NO NC C NO NO COM COM COOL 3 NO C NC RELAY 9
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Pressure with a Variable Frequency Drive (VFD) – T775U IMPORTANT After the desired value is selected, be sure to press the # or $ or HOME button in order to save that value in the controller’s memory. Application Description In this application the T775U is controlling duct pressure with a fan controlled by an NXS or NXL Variable Frequency Drive.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Carbon Dioxide (CO2) Sensing – T775U Table 2. CO2 PPM to % conversion. Application Description CO 2 PPM Percentage Display In this application, the T775U is controlling an outside air damper based on CO2 sensing input, to maintain reasonable CO2 levels. 0 0% 200 10% 400 20% Sensor Designation 600 30% This device application requires one sensor.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775 APPLICATION REPLACEMENT EXAMPLES T775M2030 Replacement for W973A Logic Panel This section describes how a T775 Series 2000 Electronic Stand-Alone Controller is wired and programmed to replace various older generation Honeywell devices. • This replacement example illustrates how a T775M2030 is configured to replace a two-stage Heat and two-stage Cool W973A Logic Panel. • Fig. 34 illustrates the wiring connections for the W973A Logic Panel. Fig.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775M2030 Replacement for W973A Logic Panel (continued) NOTE: Fig. 35 is for wiring purposes only. A thorough review of the existing W973A application is required in order to determine the capability of the T775 controller replacement.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775M2030 Replacement for W973A Logic Panel (continued) In this replacement application, the T775M2030 provides the following, as described in Table 3: Table 3. T775M2030 Replacement for W973A Component/Function W973A Logic Panel T775M2030 Replacement Thermostat T7067 Sensor A (Room) - C7130B1008. Discharge Sensor C7046 Sensor B (Discharge) - C7046D1008. Heating/Cooling Motor M954 Series 90, 4-20 mA, 0-10 Vdc, or 2-12 Vdc motor may be used.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775R Replacement for W964F Aquatrol Panel with Floating Actuator This replacement example illustrates how a T77R is configured to replace a W964F Aquatrol Panel. • • Fig. 36 illustrates the wiring connections for the W964F Aquatrol Panel. Fig. 37 and Table 4 on page 34 illustrate the wiring and configuration of the T775R controller.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775R Replacement for W964F Aquatrol Panel with Floating Actuator (continued) OPTIONAL MOTOR CONFIGURATION T1 T2 B R W NOTE: Fig. 37 is for wiring purposes only. A thorough review of the existing W964F application is required in order to determine the capability of the T775 controller replacement.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775R Replacement for W964F Aquatrol Panel with Floating Actuator (continued) In this replacement application, the T775R provides the following, as described in Table 4. Table 4. T775R Replacement for W964F Component/Function Sensors W964F Aquatrol T7044A or T7043A T7043B Reset ratio and parallel shift n/a T775R Replacement Sensor A - Standard 1097 Ohm temperature sensor. Sensor B - Standard 1097 Ohm temperature sensor.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775L Replacement for S984 Step Controller This replacement example illustrates how a T775L using a T775S Expansion module is configured to replace a S984 Step Controller. Fig. 38 illustrates the wiring connections for the S984 Step Controller. Fig. 39 and Table 5 on page 36 illustrate the wiring and configuration of the T775L controller. NOTE: This replacement section also applies to the S684 Step Controller.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775L Replacement for S984 Step Controller (continued) NOTE: Fig. 39 is for wiring purposes only. A thorough review of the existing S984 application is required in order to determine the capability of the T775 controller replacement.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775L Replacement for W7100C Discharge Air Controller Fig. 40 illustrates the wiring connections for the W7100C Discharge Air Controller. Fig. 41 and Table 6 on page 39 illustrate the wiring and configuration of the T775L controller. This replacement example illustrates how a T775L using a T775S Expansion module is configured to replace a two-stage Heat and four-stage Cool W7100C Discharge Air Controller.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775L Replacement for W7100C Discharge Air Controller (continued) NOTE: Fig. 41 is for wiring purposes only. A thorough review of the existing W7100C application is required in order to determine the capability of the T775 controller replacement.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS T775L Replacement for W7100C Discharge Air Controller (continued) In this replacement application, the T775L provides the following, as described in Table 6: Table 6. T775L Replacement for W7100C. W7100C Discharge Air Controller Component/Function Sensor C7100 T775L Replacement Sensor A - C7100D1001 T7047C1025 and S963B1037 Sensor B - Standard 1097 Ohm temperature sensor; space or outdoor See “Temperature Sensors” on page 3.
Table 7 lists the manufacturers in the following order: • Johnson (System 350) — beginning on page 40 • Honeywell — beginning on page 41 • Johnson (Mechanical) — beginning on page 44 • White Rogers — beginning on page 47 • Barber Colman — beginning on page 48 • Ranco — beginning on page 49 • Tekmar — beginning on page 50 Table 7. Cross Reference.
Table 7. Cross Reference. (Continued) Old Control Temperature ° F / Humidity Manufacturer Range (RH) Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement Honeywell Well # (Order Sep.
Old Control Temperature ° F / Humidity Range (RH) Manufacturer Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement Honeywell Well # (Order Sep.) Comments T475A1016 Honeywell 70 to 140 SPST 10/30 ft. T775R2035 5001774-001 The T775R is a Reset controller T475A1032 Honeywell 70 to 140 SPST 10/30 ft.
Table 7. Cross Reference. (Continued) Old Control Temperature ° F / Humidity Manufacturer Range (RH) Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement Honeywell Well # (Order Sep.) T675A1508 Honeywell 0 to 100 SPDT 5 ft. T775A2009 5001774-001 T675A1516 Honeywell 0 to 100 SPDT 5 ft. T775A2009 5001774-001 T675A1524 Honeywell 55 to 175 SPDT 20 ft.
Table 7. Cross Reference. (Continued) Old Control Temperature ° F / Humidity Manufacturer Range (RH) Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.
Table 7. Cross Reference. (Continued) Old Control Temperature ° F / Humidity Manufacturer Range (RH) Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) A18ABC-24 Johnson -30 to 100 SPDT 8 ft. T6031A1136 1/2” - 123869A A19ABC-36 Johnson -30 to 100 SPDT 20 ft. T6031A1060 A19ABC-37 Johnson -30 to 100 SPDT 10 ft. T6031A1060 1/2” - 123869A A19ACC-4 Johnson 0 to 80 SPDT 6 ft.
Old Control Temperature ° F / Humidity Range (RH) Manufacturer Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement 5001774-001 T775B2032 + 50021579-001 (x3) or + C7031J2009 or + C7100D1001 A28AA-28 Johnson 30 to 110 2-SPDT 6 ft. T678A1478 (fast response) None A28AA-29 Johnson -30 to 110 2-SPDT 8 ft.
Table 7. Cross Reference. (Continued) Old Control A80ABA-4 Temperature ° F / Humidity Manufacturer Range (RH) Johnson 120 to 200 Switch Action Cap Length 135 Ohm 6 ft. Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement Honeywell Well # (Order Sep.) T915C1928 112622AA T775M2048 5001774-001 A80ABA-5 Johnson 190 to 260 135 Ohm 6 ft.
Old Control Temperature ° F / Humidity Range (RH) Manufacturer Switch Action Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement 241-2 White Rodgers 20 to 90 SPST 8 ft. T4031A1073 1/2” - 123869A 241-16 White Rodgers 20 to 90 SPST 8 ft. T4031A1073 1/2” - 123869A 445-6 White Rodgers 20 to 90 SPDT 5 ft. T6031A1136 1/2” - 123869A 16A35-3 White Rodgers N/A SPST 7 ft.
Table 7. Cross Reference. (Continued) Old Control Temperature ° F / Humidity Manufacturer Range (RH) Switch Action TC4316 Barber Colman -40 to 120 SPDT TC4416 Barber Colman -40 to 120 TC5131 Barber Colman 34 to 60 TC5141 Barber Colman 34 to 60 SPDT Cap Length Recommended Honeywell Electromechanical Replacement Honeywell Well # (Order Sep.) Recommended Honeywell Electronic Replacement Honeywell Well # (Order Sep.) 6 ft. None — T775B2032 5001774-001 2-SPDT 6 ft.
Table 7. Cross Reference.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS NOTES 51 63-7147—3
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2008 Honeywell International Inc. 63-7147—3 J.I. Rev.
