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Honeywell PC8900A Manual

Perfect climate comfort center
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PC8900A

GENERAL

This document contains information on the Perfect Climate
Comfort Center™ Control System including components and
accessories. Some components and accessories include the
PC8900A Control Panel, W8900A-C Remote Module, C7189A
Remote Indoor Sensor, C7089A Outdoor Sensor, C7100A
Discharge Air Sensor, CO2 Monitor, CM8900A Communication
Module, and W8735B Telephone Access Module.
The Comfort Center control system provides 24 Vac energy
saving control for a heating and cooling system, while
providing reliable and precise temperature, ventilation and
humidity control.
® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved
Perfect Climate Comfort Center™
W8900A-C
Control System

FEATURES

The PC8900A mounts in the living space and accurately
measures and controls room temperature and humidity.
• Only four wires required for installation.
• Large, continuously lit LCD.
• Seven-day (auto copy) programming.
• Simultaneous display of heat and cool setpoints.
• Keyboard lockout protection available.
• No batteries required, indefinite program retention.
• Circulation fan setting improves indoor air quality.
• Field configurable for:
- Automatic or manual changeover.
- °F or °C display.
- 12- or 24-hour clock.
- Adaptive Intelligent Recovery™ control or
conventional recovery.
- Humidity control in heating or cooling.
- Outdoor, remote, and discharge temperature
sensors available.
- Fan overrun in cooling.
- Ventilation control.
The W8900A-C mounts near the equipment. The
PC8900A, heating, cooling, ventilation and
dehumidification equipment and all additional sensors
are wired to the W8900A-C.
• Compatible with most 24 Vac Systems.
• Remote sensor, discharge sensor, outdoor sensor and
CO
monitor available.
2
• Optional remote communications available.
General .............................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring Diagrams ...............................................................
W8900A,C Hookup Diagrams ......................................
W8900B Hookup Diagrams ......................................... 14
Installer Setup .................................................................. 24
Programming PC8900A .................................................... 27
Checkout .......................................................................... 33
Operation .......................................................................... 34
Troubleshooting ................................................................ 40
Glossary ........................................................................... 44
PRODUCT DATA
Contents
1
1
2
2
5
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68- 0173-3

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  • Page 1: Table Of Contents

    Perfect Climate Comfort Center™ Control System PRODUCT DATA FEATURES The PC8900A mounts in the living space and accurately measures and controls room temperature and humidity. • Only four wires required for installation. • Large, continuously lit LCD. • Seven-day (auto copy) programming.

  • Page 2: Specifications

    Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 (800) 328-5111 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
  • Page 3 All programmed setpoints and Inrush: 50% power factor minimum. times are retained indefinitely. Temperature Setting Range: PC8900A: 45° to 88°F Resistance Characteristics of Sensors: (7° to 31°C). C7089A Outdoor Sensor: PTC Sensor. See Fig. 41 in the Operation section for sensor resistance characteristics.
  • Page 4 1-1/2 (38) (152) (22) (22) M4488 3-1/4 (83) 8-1/2 (216) Fig. 3. Dimensions for C7089A Outdoor Sensor M7513 Mounting Clip in in. (mm). Fig. 2. Dimensions for 205224A Wall Cover Plate in in. (mm). 1-3/16 1-13/16 (30) (46) 1-3/16 13-1/4 (336) (30) (19) M4461...

  • Page 5: Installation

    PC8900 SHOWN WITH COVER REMOVED. TIME CANCEL M6356 Fig. 6. Dimensions for PC8900A Control Panel in in. (mm). MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control 7-13/16 in the trash.
  • Page 6 CAUTION Disconnect power supply before wiring to prevent electrical shock or equipment damage. W8900 WALL Mounting the W8900A-C Remote Module Locate the W8900A-C in the equipment room near the HVAC equipment. See Fig. 8. MOUNTING HOLES (4) CAUTION Do not mount the W8900A-C inside any HVAC equipment.
  • Page 7 In single stage heat pump applications, jumper W1 and Y1 and connect to Y. Configure the system for Auto Fan in Heat. Dual fuel fan feature configured in installer setup. Filter light feature available in PC8900A fan accumulation timer feature. 68-0173—3...
  • Page 8 Table 3. Heat Pump Applications (W8900B). Existing Thermostat Existing Thermostat W8900B Terminal Designations Designations Function Designations (Standard) (Customer Specials) PC8900A Control Panel — — PC8900A Control Panel — — PC8900A Control Panel — — PC8900A Control Panel — — Stage-3 heat control (strip heat) —...

  • Page 9: Wiring Diagrams

    WIRING DIAGRAMS W8900A,C Hookup Diagrams W8900A,C C7189A REMOTE AIR MONITOR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR FAN RELAY STAGE 2 COOL RELAY (HOT) STAGE 1 HEATING COOL RELAY TRANSFORMER STAGE 1 HEAT RELAY HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT...
  • Page 10 W8900A,C C7189A REMOTE AIR MONITOR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR FAN RELAY STAGE 2 COOL RELAY STAGE 1 COOL RELAY (HOT) SYSTEM STAGE 1 TRANSFORMER HEAT RELAY HUMIDIFIER OR DEHUMIDIFIER STAGE 2 EQUIPMENT HEAT RELAY POWER SUPPLY.
  • Page 11 W8900A,C C7189A REMOTE AIR MONITOR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR FAN RELAY STAGE 1 COOL RELAY (HOT) SYSTEM TRANSFORMER HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT S8610U VENTILATION VENT EQUIPMENT DAMPER (BURNER) MV MV/PV PV 24V TH-W SPARK PLUG...
  • Page 12 C7189A REMOTE AIR W8900A,C MONITOR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VENTILATION EQUIPMENT ZONE 2 THERMOSTAT ZONE 3 THERMOSTAT ZONE 4 THERMOSTAT R8222B1067 R8222B1067 R8222B1067 R8239A1052 (HOT) ZONE 1 ZONE 2 ZONE 3 ZONE 4...
  • Page 13 W8900A,C C7189A REMOTE AIR MONITOR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR FAN RELAY STAGE 1 (HOT) COOL RELAY SYSTEM TRANSFORMER HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VENTILATION EQUIPMENT POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. (HOT) DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

  • Page 14: W8900B Hookup Diagrams

    W8900B Hookup Diagrams MONITOR W8900B C7189A REMOTE AIR COMPRESSOR TEMPERATURE SENSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR CHANGEOVER RELAY FAN RELAY COMPRESSOR CONTACTOR Y1/W1 (HOT) EMERGENCY SYSTEM HEAT RELAY TRANSFORMER AUXILIARY HUMIDIFIER OR HEAT RELAY DEHUMIDIFIER EQUIPMENT POWER SUPPLY.
  • Page 15 MONITOR C7189A REMOTE AIR W8900B COMPRESSOR TEMPERATURE SENSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR CHANGEOVER RELAY FAN RELAY STAGE 2 COMPRESSOR Y1/W1 (HOT) SYSTEM STAGE 1 COMPRESSOR TRANSFORMER HUMIDIFIER OR DEHUMIDIFIER EMERGENCY EQUIPMENT HEAT RELAY AUXILIARY VENTILATION HEAT RELAY...
  • Page 16 MONITOR C7189A REMOTE AIR W8900B TEMPERATURE SENSOR COMPRESSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR R8222N1011 STAGE 1 HEAT RELAY Y1/W1 (HOT) SYSTEM TRANSFORMER STAGE 1 COOL RELAY HUMIDIFIER OR DEHUMIDIFIER HEAT EQUIPMENT CHANGEOVER VALVE VENTILATION POWER SUPPLY.
  • Page 17 MONITOR C7189A REMOTE AIR W8900B TEMPERATURE SENSOR COMPRESSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 C7089A OUTDOOR AIR TEMPERATURE SENSOR R8222N1011 STAGE 1 COOL RELAY Y1/W1 (HOT) SYSTEM TRANSFORMER STAGE 1 HEAT RELAY HUMIDIFIER OR DEHUMIDIFIER COOL EQUIPMENT CHANGEOVER VALVE VENTILATION POWER SUPPLY.

  • Page 18: W8900A,B,C Humidity Control Hookup Diagrams

    PC8900A location. Location Guidelines SYSTEM TRANSFORMER • Choose a location for the PC8900A where it is safe from tampering. • Locate the PC8900A on an inside wall, about 5 ft (1.5m) (HOT) above the floor. The PC8900A can also be mounted horizontally on a standard 2 x 4 in.
  • Page 19 PANEL CHOOSE THREE MOUNTING HOLES THAT BEST FIT APPLICATION. M7512A Fig. 23. Mounting PC8900A Wiring Plate and 205224A Wall Cover Plate to wall. Wiring the PC8900A IMPORTANT Erratic temperature readings can occur as a result of any of the wiring practices described below. These...
  • Page 20 All wiring must comply with all applicable electrical codes, ordinances and regulations. 1. Loosen the PC8900A terminal screws and insert one wire beneath each terminal (1, 2, 3, 4). Four wires are required at the PC8900A to assure operation. Note the...
  • Page 21 Ground the shielded cable to the ground from affecting the C7189A and PC8900A performance. terminal on the W8900A-C. 3. Remove the C7189A Cover.
  • Page 22 W8900 C7189 (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. IF MORE THAN ONE C7189 REMOTE SENSOR IS REQUIRED, REFER TO DIAGRAM BELOW. IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL ON W8900. W8900 W8900 C7189 C7189 C7189 C7189...
  • Page 23 — Mount it high enough to prevent tampering or coverage by snow, ice or debris. • The wire distance between the C7089A and W8900A-C WIRING HOLE should not exceed 200 ft. THROUGH C7089 STRUCTURE Mounting 1. Remove the sensor from the mounting clip. 2.

  • Page 24: Installer Setup

    The installer setup mode is used by the installer to configure or plenum and fasten the junction box and sensor to the the PC8900A/W8900A-C for the HVAC equipment used at the duct or plenum surface. installation (heating, cooling, ventilation, humidification, air cleaning) and to configure the PC8900A operation (changeover mode, remote sensors, and outdoor sensors).
  • Page 25 TO ENTER THE INSTALLER SETUP MODE: System Options 1. Hold the PC8900A CHECK key until all display When SYSTEM is flashing, the following list of options segments are displayed (approximately three seconds). pertaining to the equipment and sensors connected to the See Fig.
  • Page 26 The humidity option can only be set for heat or cool. If both are set to Y, it will not honor either one. Heat Options When HEAT is flashing, refer to Table 5 for the options SYSTEM pertaining to the heat equipment that appear in the PC8900A HEAT COOL SYSTEM display after each press of the CHECK key.

  • Page 27: Programming Pc8900A

    Press the up or down arrowhead key until the word HEAT is Table 6. Cooling Cycle Rates. flashing on the PC8900A display. Cycles per Display Shows Hour The PC8900A/W8900A-C is designed to be used on most System Setting Stage 1 Stage 2 types of heating systems. Initially, the PC8900A/W8900A-C...
  • Page 28 68°, the cooling setpoint can be no lower than 71°. SYSTEM CHECK And when cooling is set for 70°, the heat setpoint CANCEL changes to 67°. The PC8900A automatically pushes SYSTEM HEAT/COOL CLOCK HEAT OFF COOL AUTO ON CIRC...
  • Page 29 4. Setting Ventilator c. Press and hold SELECT PERIOD until the desired period is displayed. a. Press VENTILATE to display VENT when increased ventilation is desired during the WAKE period. HEAT SET PT COOL SYSTEM CHECK SELECT SYSTEM HEAT COOL SET PT PERIOD SYSTEM HEAT/COOL...
  • Page 30 10. Programming the System Setting c. Press RUN to exit the program mode. a. Press SYSTEM until desired setting ( HEAT, OFF, SYSTEM COOL, AUTO, EM HEAT ) is displayed. CHECK SYSTEM HEAT/COOL CLOCK SETPOINTS HEAT OFF COOL AUTO ON CIRC SELECT HUMIDITY VENTILATE...
  • Page 31 4. Programming Hold for 1 to 7 Days NOTE: To cancel steps 4a. through 4f., press the CANCEL key. a. Press HOLD. The temperature, fan and ventilation setting are in effect until SYSTEM HEAT COOL SET PT the day and time selected. At that time, the Comfort Center™ CHECK HOLD program returns to the regularly programmed settings.
  • Page 32 Canceling Program Settings. 2. Review Current Setpoints and Readings Each period can be canceled. Use the following instructions to check the setpoints for the current period only and to check the actual humidity and outdoor readings. 6. Canceling Period a. Press DAY until the desired day appears in the NOTE: Return to the program at any time by pressing RUN.

  • Page 33: Checkout

    Checkout is activated from the W8900A-C Remote Module. change the keyboard setting. The PC8900A Control Panel does not have to be connected to 1. Press and hold RUN until OPEN KEY or LOCK KEY use the checkout. If the PC8900A is connected, the PC8900A show in the display (approximately three seconds).

  • Page 34: Operation

    Installer Display of all Segments and Product Codes (Optional) 1. Press and hold CHECK key until all segments of the The PC8900A, C7089A, C7189A, C7100A and CO monitor display are lighted. See Fig. 31. sense the temperature, humidity and CO conditions in the 2.
  • Page 35 Energy Savings Period Another way the Comfort Center™ program minimizes In mild to moderate weather, the PC8900A calls on the heat auxiliary heat usage is by having two recovery ramps: one for pump only when the sensed temperature falls below the stage-one compressor and one for auxiliary heat.
  • Page 36 THERMAL PERFORMANCE When outdoor temperature is close to the balance point of the During severe weather, the PC8900A actually controls closer heat pump, the heat pump runs continuously during the to the setpoint than a conventional control. This is because recovery period and auxiliary heat cycles if necessary.
  • Page 37 When the heating or cooling system is programming or by pressing the fan button on the not running at all, the fan runs for ten minutes on, PC8900A. and 20 minutes off. Protection against fan short cycling is built into the device.
  • Page 38 C7100A Discharge Air Temperature Sensor The discharge air temperature is displayed on the PC8900A when the Check key is pressed. If the PC8900A is configured The C7100A Discharge Air Temperature Sensor mounts on for a discharge air temperature but the discharge air tempera-...
  • Page 39 This removes the discharge air temperature changed. This feature gives the PC8900A the security of a from the display when the CHECK key is pressed locking cover with flexibility to meet the user’s schedule. To and avoids confusion.

  • Page 40: Troubleshooting

    TROUBLESHOOTING See Fig. 41 for troubleshooting procedures. IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION. 1. PRESS THE CHECK KEY. PC8900 DISPLAY SHOWS: POSSIBLE CAUSE ACTION • CHECK CONNECTIONS BETWEEN HOME SYSTEM AND COMMUNICATIONS WITH THE HOME COMMUNICATION MODULE.
  • Page 41 IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION. 1. PRESS THE CHECK KEY. PC8900 DISPLAY SHOWS: POSSIBLE CAUSE ACTION • CHECK CONNECTIONS BETWEEN C7089 AND W8900. W8900 CANNOT READ OUTDOOR AIR TEMPERATURE. • RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY. PC8900 CONFIGURED FOR OUTDOOR TEMPERATURE SENSOR, BUT NOT INSTALLED.
  • Page 42 SYMPTOM POSSIBLE CAUSE ACTION TEMPERATURE CHANGES PC8900 PROGRAMMED INCORRECTLY. • CHECK THE PROGRAM TIMES FOR THE PERIOD IN QUESTION. OCCUR AT THE WRONG TIMES. BE SURE THAT AM AND PM INDICATIONS ARE CORRECT. MAKE SURE THE CURRENT DAY AND TIME ARE CORRECT. REPROGRAM IF NECESSARY.
  • Page 43 SYMPTOM POSSIBLE CAUSE ACTION HUMIDIFICATION EQUIPMENT • RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING PC8900 IS NOT CONFIGURED PROPERLY. WILL NOT COME ON IN (APPLIES TO W8900A,B ONLY). HEATING. HUMIDITY SETTING IS TO LOW. • ADJUST HUMIDITY SETTING USING KEYS. •...

  • Page 44: Glossary

    SYSTEM LIGHT (YELLOW) energy savings temperature (LEAVE, SLEEP) to the comfort On the PC8900A, this lights glows when there is a call for temperature (WAKE, RETURN). heating or cooling. DAILY PROGRAM SCHEDULE...

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W8900a-c

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