Honeywell W7100 User Manual

PRODUCT DATA
® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved 63-4046—1
W7100G
Discharge Water
Temperature Control
APPLICATION
The microprocessor-based W7100G Discharge Water
Temperature Control maintains an average discharge
water temperature for reciprocating chiller applications, by
staging on and off compressors or unloaders as required.
The W7100 can provide up to 10 stages of cooling using a
W7101 Satellite Sequencer.
FEATURES
• Up to six stages of cooling provided.
• Expandable system up to 10 cooling stages using a
W7101.
• Advanced proportional plus integral microprocessor
control algorithm minimizes droop.
• Soft start to minimize compressor cycling during
system start up.
• Adjustable minimum on/off timing and time delay
between stages of either 30 or 60 seconds.
• Adjustable setpoint from 10 to 110°F (-12 to 43°C).
• Adjustable reset differential from 5 to 20°F (3 to 11K).
• Adjustable control band from 0 to 10°F (0 to 6K).
• Reset signal from either an outdoor air or space
sensor.
• C7170 sensor can be used for sensing water
temperature.
• LED show which stages of cooling are energized.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 3
Operation .......................................................................... 6
Settings and Adjustments ................................................. 8
System Checkout ............................................................. 9
Troubleshooting ................................................................ 10

Honeywell W7100 Specifications

General

Control Algorithm	PID, On/Off
Input Type	Thermocouple, RTD
Output Type	Relay, Voltage, Current
Communication	RS-485
Power Supply	24V AC/DC, 100-240V AC
Operating Temperature	0°C to 50°C (32°F to 122°F)

Summary

FEATURES

APPLICATION

SPECIFICATIONS

Electrical Ratings

Specifies input voltage, frequency, and power consumption ratings for the device and stages.

Sensor Input Signal

Details the resistance characteristics of the sensor input signal as a function of temperature.

Number of Stages Input

Explains how resistor values determine the number of ON/OFF stages controlled.

Temperature Ratings

Lists ambient and shipping temperature ranges for the controller.

Humidity Rating

States the non-condensing humidity rating for the device.

Mounting

Describes mounting requirements, including screw size.

Approvals

Lists component recognition by Underwriter's Laboratories Inc.

Additional System Components

Lists related system components like sensors and transformers.

Accessories

Lists available accessories for system expansion and configuration.

ORDERING INFORMATION

INSTALLATION

Location and Mounting

Guides on selecting a location and mounting the controller and sensor.

WIRING

Changing Number of Controlled Stages

Explains how to change the number of stages controlled by adjusting a resistor.

System Connections Diagram

Wiring Notes

Important notes and precautions related to the W7100G and W7101A wiring connections.

OPERATION

Chiller System Description

Explains the general purpose and function of chiller systems.

Discharge Water Temperature Control Operation

Details how the W7100G maintains stable discharge water temperature using its control band.

Reset of Discharge Water Temperature

Discusses resetting the discharge water temperature setpoint for energy savings.

Reset Operation Details

Space Reset Algorithm

Illustrates the algorithm for adjusting setpoint based on space temperature.

Space Reset Wiring

Shows wiring diagrams for space reset sensors and potentiometers.

Outdoor Resets

Explains using outdoor air temperature for setpoint reset to improve efficiency.

Outdoor Reset Schedule

Illustrates the algorithm for adjusting setpoint based on outdoor air temperature.

W7100 LED Operation

Describes the function and behavior of the LEDs indicating stage operation.

Reset Modifications

Details how to modify outdoor air reset start and stop temperatures using resistors.

SETTINGS AND ADJUSTMENTS

Setpoint Knob

Provides typical setpoint ranges for HVAC and industrial applications.

Reset Knob

Recommends reset ranges for HVAC applications based on space conditions.

Control Band Knob

Explains how to set the control band for optimal response and stability.

Fast Response Input

Details how to select timings (30 or 60 seconds) for stage delays via jumpers.

Number Of Stages

Instructs on selecting the correct resistor for the total number of controlled stages.

SYSTEM CHECKOUT

TROUBLESHOOTING