Product Overview

ManualsBrandsHoneywell ManualsCommercial Thermostats & Controls20 to 30 Vac Discharge air temperature controller (0 Heat/6 Cool)

PRODUCT DATA

® U.S. Registered Trademark

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

Summary of content (12 pages)

PAGE 1
W7100G Discharge Water Temperature Control PRODUCT DATA 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).
PAGE 2
W7100G DISCHARGE WATER TEMPERATURE CONTROL SPECIFICATIONS W7100G Model Features: • 6 stage cooling, controls reciprocating chillers. • W7101 satellite expansion to 10 cooling stages. • Adjustable setpoint. Humidity Rating: 5 to 90 percent RH noncondensing. Dimensions: See Fig. 1. Approvals: Underwriter’s Laboratories Inc. Component Recognized. Mounting: Four mounting holes in base. Use No. 6 screws (not provided).
PAGE 3
W7100G DISCHARGE WATER TEMPERATURE CONTROL INSTALLATION 3/16 DIAMETER (5) 4 HOLES When Installing this Product... 1. 2. 7-13/16 (198) 3. 8-5/8 (219) 5-3/4 (146) 4. WARNING: This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the Instructions Manual, may cause interference with radio communication.
PAGE 4
W7100G DISCHARGE WATER TEMPERATURE CONTROL W7100G CUTOUT SETPOINT F COOL 6 COOL 5 COOL 4 10 60 20 50 40 30 RESET F 20 5 15 COOL 3 COOL 2 CONTROL BAND F 10 0 8 2 UNLOADER B C A UNLOADER TDR-1 B C A TIME DELAY B C TDR-1 B C 1 B C A Connecting Additional Stages COMPRESSOR Control of up to 4 additional stages of ON/OFF cooling can be added by using a W7101A Satellite Sequencer to the W7100G system as shown in Fig. 4.
PAGE 5
W7100G DISCHARGE WATER TEMPERATURE CONTROL 1 L1 (HOT) L2 TRANSFORMER 2 W7100A DISCHARGE AIR CONTROLLER COOL GND TR TR B C A COOL 10 9 8 7 6 T T1 4 P2 P1 T7047C1025 SPACE RESET SENSOR OR C7013G1016 OUTDOOR RESET SENSOR C7100 DISCHARGE SENSOR 5 FAST RESPONSE 70 COOL 5 B C 60 65 B 4 RESET F NO.
PAGE 6
W7100G DISCHARGE WATER TEMPERATURE CONTROL OPERATION Chiller System Description (Fig. 5) 5. Chiller systems are used to provide cold water for many types of end uses. The cold water may be piped to many air handling units located throughout a building. These units then provide cooling and ventilation for individual zones throughout that building. Chillers are also used to supply cold fluid for a variety of process applications. In either case, precise discharge water temperature control is desired. 6.
PAGE 7
W7100G DISCHARGE WATER TEMPERATURE CONTROL In applications where outdoor temperature does have a major effect on the cooling load of a building, outdoor reset can have the same advantages as space reset. Fig. 9 shows the outdoor air reset operation (algorithm). SPACE RESET MECHANICAL COOLING SETPOINT FULL RESET As the outdoor air temperature rises above 70°F (21°C), the W7100G discharge water temperature setpoint is reset downward.
PAGE 8
W7100G DISCHARGE WATER TEMPERATURE CONTROL SETTINGS AND ADJUSTMENTS Table 3. Reset Modification Resistor Selection Chart T-High (no reset) 100 95 90 85 80 75 T-Low (full reset) 75 70 65 60 55 50 Rp 14.7K 7.68K 5.36K 4.22K 3.48K 3.01K Rs 196 324 Rp — 14.7K 7.68K 5.36K 4.22K 3.57K Rs — 187 432 316 511 412 576 499 634 562 Rp — 0 14.7K 7.68K 5.49K 4.
PAGE 9
W7100G DISCHARGE WATER TEMPERATURE CONTROL SYSTEM CHECKOUT To field test the system, follow the steps detailed in Table 4. In order to complete this checkout, the following equipment is required: — 4074EDJ Test Plug and Resistor Bag Assembly. — 4074EFV Resistor Bag Assembly. — Digital VOM meter. — 195770A Test Plug. Table 4. W7100G System Checkout. Step Action Verification 1 Disconnect power from W7100. Check for 0 Vac across W7100 TR and TR terminals.
PAGE 10
W7100G DISCHARGE WATER TEMPERATURE CONTROL TROUBLESHOOTING (TABLE 5) Table 5. W7100G Troubleshooting Guide. Problem Possible Cause Corrective Action Discharge temperature too high. 1. Integral setpoint not at minimum position when used with remote setpoint. 1. Set integral setpoint at minimum position when using remote setpoint. 2. System malfunction. 2. Consult HVAC manufacturer’s equipment manual and/or building engineering requirements. No cooling. 1.
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63-4046—1
PAGE 12
Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Europe S.A. Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong 63-4046—1 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 B.B. Rev. 9-01 3 Avenue du Bourget 1140 Brussels Belgium Honeywell Latin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325 www.honeywell.