Brochure
Table Of Contents
- TABLE OF CONTENTS
- T775 APPLICATION TIPS
- COMPATIBLE COMPONENTS
- FEATURES
- T775 OPERATIONS
- T775 APPLICATIONS
- Water Source Heat Pump Loop Water Controller - T775B
- Chiller - T775B
- Chiller, Rotary Compressor - T775B
- Cooling Tower Control - T775B2040
- Time-based Control of Fan, Pump, etc. - T775 (all models)
- Damper or Valve Modulation - T775M or T775R
- Hot Water Reset - T775R
- Chilled Water Reset - T775R
- Multi-Stage Boiler Control (No Reset) - T775P
- Multi-Stage Boiler Control (Reset) - T775P
- Multi-Stage Boiler Control (Reset) (continued)
- Multi-Stage Chiller Control (No Reset) - T775P
- 4 Stage with Pump Output and Reset - T775P using a T775S Expansion Module
- 4 Stage with Pump Output and Reset (continued)
- 3 Stage Reciprocating Chiller - T775L
- 4 Stage Heat and 6 Stage Cool - T775L
- 4 Stage Heat and 6 Stage Cool (continued)
- Pressure with a Variable Frequency Drive (VFD) - T775U
- Carbon Dioxide (CO2) Sensing - T775U
- T775 APPLICATION REPLACEMENT EXAMPLES
- T775M2030 Replacement for W973A Logic Panel
- T775M2030 Replacement for W973A Logic Panel (continued)
- T775M2030 Replacement for W973A Logic Panel (continued)
- T775R Replacement for W964F Aquatrol Panel with Floating Actuator
- T775R Replacement for W964F Aquatrol Panel with Floating Actuator (continued)
- T775R Replacement for W964F Aquatrol Panel with Floating Actuator (continued)
- T775L Replacement for S984 Step Controller
- T775L Replacement for S984 Step Controller (continued)
- T775L Replacement for W7100C Discharge Air Controller
- T775L Replacement for W7100C Discharge Air Controller (continued)
- T775L Replacement for W7100C Discharge Air Controller (continued)
- T775 CROSS REFERENCE
- NOTES
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
29 63-7147—3
T775 APPLICATION REPLACEMENT
EXAMPLES
This section describes how a T775 Series 2000 Electronic
Stand-Alone Controller is wired and programmed to replace
various older generation Honeywell devices.
T775M2030 Replacement for W973A Logic
Panel
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. 35 and Table 3 on page 31 illustrate the wiring and
configuration of the T775M2030 controller.
Fig. 34. W973A Wiring Connections (Pre-existing Control).
NOTE: The T775M2030 Replacement for W973A Logic Panel continues on the next page.
W973A
T
YBWRTT15243T1 R
T7067 THERMOSTAT
15243
8
7
6
SENSOR STAT 24V ECONO
MOD-HEAT MOD-COOL
WCBCRC
RHBHWH
W
R
L1
(HOT)
L2
L1
(HOT)
L2
R
1HEAT2
1COOL2
C +20 NH
COOL 1
COOL 2
HEAT 2
HEAT 1
T675A HIGH LIMIT
T675A COMPRESSOR LOCKOUT
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
W973A SHOWN. W973B HAS 3 HEAT AND 3 COOL STAGES.
USE MODULATING AND/OR OUTPUT RELAYS DEPENDING ON APPLICATION.
USE FAN START RELAY AND/OR PLENUM FAN CONTROL FOR AUTOMATIC FAN OPERATION IN
HEATING MODE.
3
2
4
M24562
R1
B1
W1
T2
T1
L1
(HOT)
L2
C7046
DISCHARGE
SENSOR
1
W1
B1
R1
T2
T1
L1
(HOT)
L2
FAN START
RELAY
L1
(HOT)
L2
FAN RELAY
(OPTIONAL) PLENUM
FAN CONTROL
4
1
1
1
B1
W1
R1
T2
T1
L1
(HOT)
L2
1
2
4
MIN. POSITION
POT ENTIOMETER
H205 OUTSIDE
AIR CHANGEOVER
31 2
BWR
M954 MOTOR
(HEATING)
3
M954 MOTOR
(COOLING)
M955 MOTOR (ECONOMIZER)