Honeywell W7100G1001/U User Manual

PRODUCT DATA
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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 W7100G1001/U Specifications

General

Type	Temperature Controller
Input Type	Thermistor
Output Type	Relay
Control Algorithm	PID
Power Supply	24 Vac
Display	LCD
Voltage	24V
Mounting	Wall
Stages	1

Summary

Features

Application

Specifications

Ordering Information

Installation

Location and Mounting

Details mounting guidelines and controller placement considerations for optimal operation.

Operation

Discharge Water Temperature Control Operation

Explains the W7100G's integrating control band concept for stable temperature control in chiller systems.

Reset of Discharge Water Temperature

Discusses using reset strategies for energy savings in HVAC and process applications.

Reset from Space Temperature

Describes resetting discharge water temperature based on average space temperature for efficiency.

Outdoor Resets

Details using outdoor air temperature to adjust cooling setpoint for energy savings.

W7100 LED Operation

Explains the function of the LEDs indicating staged output status.

Reset Modifications

Explains 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

Guides setting the control band to balance response speed and temperature deviation.

Fast Response Input

Explains how to select timings between stages using jumpers.

Number Of Stages

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

System Checkout

Troubleshooting