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Honeywell T775B Series User Manual
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Automation and Co
ntrol Solutions
Honeywell Internationa
l Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Regis
tered Trademark
© 2010 Honeywell
International
Inc.
63-7147—05 M.S.
Rev
. 10-10
Printed in U.S.
A.
55
Table of Contents
Default Chapter
2
Table of Contents
2
T775 Application Tips
3
Compatible Components
3
Temperature Sensors
3
Humidity Sensors (T775U Only)
3
Low Differential Pressure Sensors (T775U Only)
3
Universal Sensors (T775U Only)
3
Accessories
4
Features
4
T775 Operations
6
Integral Action
6
Derivative Action
6
Differential Vs. Throttling Range
6
Setpoint High Limit
6
Reset Programming (T775L, T775P, T775R, and T775U Models Only)
7
T775 Applications
8
Water Source Heat Pump Loop Water Controller - T775B
8
Chiller - T775B
9
Chiller, Rotary Compressor - T775B
10
Cooling Tower Control - T775B2040
11
Time-Based Control of Fan, Pump, Etc. - T775 (All Models)
12
Damper or Valve Modulation - T775M or T775R
13
Hot Water Reset - T775R
14
Chilled Water Reset - T775R
16
Multi-Stage Boiler Control (no Reset) - T775P
17
Multi-Stage Boiler Control (Reset) - T775P
18
Multi-Stage Chiller Control (no Reset) - T775P
20
Stage with Pump Output and Reset
21
T775P Using a T775S Expansion Module
21
Stage with Pump Output and Reset T775P Using a T775S Expansion Module
21
Stage with Pump Output and Reset (Continued)
22
Stage Reciprocating Chiller - T775L
23
Stage Heat and 6 Stage Cool - T775L
24
Stage Heat and 6 Stage Cool (Continued)
25
Pressure with a Variable Frequency Drive (VFD) - T775U
26
Carbon Dioxide (CO2) Sensing - T775U
27
Resetting Zone Air Temp Based on Outside Air Temp (2 Stage Cooling)
28
Resetting Discharge Air Temp Based on Return Air Temp (Modulating Cooling Valve)
29
Using the T775R as a Differential Temperature Controller for Solar Water Heating
30
Maintaining Differential Temperature for both Heating and Cooling
32
T775 Application Replacement Examples
33
T775M2030 Replacement for W973A Logic Panel
33
T775R Replacement for W964F Aquatrol Panel with Floating Actuator
35
T775L Replacement for S984 Step Controller
38
T775L Replacement for W7100C Discharge Air Controller
41
T775 Cross Reference
44
Notes
55
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Honeywell T775B Series Specifications
General
Brand
Honeywell
Model
T775B Series
Category
Controller
Language
English
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