User's Manual

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PRODUCT DATA

68- 0173- 3

® U.S. Registered Trademark

Perfect Climate Comfort Center™

Control System

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.

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 conven-

tional recovery.

— Humidity control in heating or cooling.

— Outdoor, remote, and discharge temperature sen-

sors 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

monitor available.

• Optional remote communications available.

PC8900A

W8900A-C

Contents

General ............................................................................. 1

Features ........................................................................... 1

Specifications .................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 5

Wiring Diagrams ............................................................... 9

W8900A,C Hookup Diagrams ....................................... 9

W8900B Hookup Diagrams ........................................... 14

W8900A,B,C Humidity Control Hookup Diagrams ........ 18

Installer Setup ................................................................... 24

Programming PC8900A .................................................... 27

Checkout .......................................................................... 33

Operation .......................................................................... 34

Troubleshooting ................................................................ 40

Glossary ........................................................................... 44

Summary of content (44 pages)

PAGE 1
Perfect Climate Comfort Center™ Control System PRODUCT DATA FEATURES PC8900A W8900A-C 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.
PAGE 2
SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances; therefore, an individual unit might not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.
PAGE 3
Finish: C7189A Wall Mount Remote Indoor Sensor: Premier White® color. PC8900A Control Panel: Premier White® color. W8900A-C Remote Module: Charcoal gray color. Clock Accuracy: ± 1 minute per month. Approvals: FCC Class B: Pending. NEMA DC-3: Not required. Batteries: No batteries required. During power outages, time is retained for six hours. All programmed setpoints and times are retained indefinitely. Resistance Characteristics of Sensors: C7089A Outdoor Sensor: PTC Sensor. See Fig.
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1-1/2 (38) 6 (152) 7/8 (22) 7/8 (22) M4488 3-1/4 (83) 8-1/2 (216) Fig. 3. Dimensions for C7089A Outdoor Sensor Mounting Clip in in. (mm). M7513 Fig. 2. Dimensions for 205224A Wall Cover Plate in in. (mm). 1-3/16 1-13/16 (30) (46) 3/4 (19) 1-3/16 (30) 13-1/4 (336) M4461 1-13/16 (46) Fig. 4. Dimensions for C7100A Discharge Air Sensor in in. (mm). 4-5/8 (117) 4-5/8 (117) 1-1/8 (29) 2-3/4 (70) M4465 3-1/4 (83) FRONT VIEW SIDE VIEW 2-3/4 (70) FRONT VIEW (COVER OFF) Fig. 5.
PAGE 5
6 (152) 1-5/8 (41) 3-1/4 (83) 4 (102) 3-3/8 (86) 7/8 (22) 7/8 (22) 6-3/8 (162) SYSTEM 4 (102) CHECK SET CLOCK SELECT PERIOD SYSTEM HEAT OFF COOL HUMIDITY DAY TIME FAN AUTO ON CIRC VENTILATE HEAT/COOL SETPOINTS HOLD TIME CANCEL RUN NOTE: PC8900 SHOWN WITH COVER REMOVED. 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 in the trash.
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CAUTION Disconnect power supply before wiring to prevent electrical shock or equipment damage. WALL W8900 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. Mounting the W8900A-C inside HVAC equipment can cause damage to the W8900A-C. 1. 2. 3. Grasp the top edge of the W8900A-C cover, either at the center or both corners, and pull it off from the base.
PAGE 7
IMPORTANT Be sure to connect the C terminal to transformer common. W8900 IN NEW INSTALLATION: 1. Locate the terminal strip(s) on the HVAC equipment. 2. Refer to Fig. 11 through 20 for wiring diagrams for specific equipment applications. 3. Connect all loads to the appropriate W8900A-C wiring terminal using 18-gauge, color-coded thermostat wire; see Fig. 10. 4. Use a small screwdriver to connect the loads. Do not overtighten; device can be damaged. FOR STRAIGHT CONNECTION— STRIP 5/16 IN.
PAGE 8
Table 3. Heat Pump Applications (W8900B).
PAGE 9
WIRING DIAGRAMS W8900A,C Hookup Diagrams CO2 MONITOR W8900A,C 4 C7189A REMOTE AIR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR CO2 PC8900 S1 C7089A OUTDOOR AIR TEMPERATURE SENSOR S T1 1 T 2 OUT 1 3 7 OUT 2 FAN RELAY 3 4 4 6 LED GND 1 C L1 (HOT) RH L2 STAGE 2 COOL RELAY R HEATING TRANSFORMER 2 G RC Y2 HUM Y1 HUM 3 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VNT W1 VNT W2 STAGE 1 COOL RELAY STAGE 1 HEAT RELAY STAGE 2 HEAT RELAY 5 VENTILATION EQUIPMENT L1 (HOT)
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4 W8900A,C CO2 MONITOR PC8900 C7189A REMOTE AIR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR CO2 S1 C7089A OUTDOOR AIR TEMPERATURE SENSOR S T1 1 T 2 3 4 OUT 1 7 OUT 2 3 FAN RELAY 4 LED GND 6 STAGE 2 COOL RELAY C 2 R 1 RH G L2 RC Y2 HUM Y1 L1 (HOT) 3 SYSTEM TRANSFORMER HUM VNT W1 VNT W2 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT 5 VENTILATION EQUIPMENT STAGE 1 COOL RELAY STAGE 1 HEAT RELAY STAGE 2 HEAT RELAY 1 POWER SUPPLY.
PAGE 11
W8900A,C CO2 MONITOR 4 C7189A REMOTE AIR TEMPERATURE SENSOR CO2 PC8900 C7100 DISCHARGE AIR TEMPERATURE SENSOR S1 C7089A OUTDOOR AIR TEMPERATURE SENSOR S T1 1 T 2 OUT 1 3 7 OUT 2 3 4 4 LED GND C 6 L2 L1 (HOT) SYSTEM 5 2 RH G RC Y2 HUM Y1 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VNT W1 VNT W2 S8610U VENTILATION EQUIPMENT MV MV/PV PV PILOT STAGE 1 COOL RELAY HUM TRANSFORMER 3 FAN RELAY R 1 COM 2ND 1ST OPERATOR OPERATOR MAIN VALVE DUAL VALVE COMBINATION GAS CONTROL
PAGE 12
C7189A REMOTE AIR TEMPERATURE SENSOR W8900A,C CO2 MONITOR 4 C7100 DISCHARGE AIR TEMPERATURE SENSOR CO2 PC8900 S1 C7089A OUTDOOR AIR TEMPERATURE SENSOR S T1 1 T 2 OUT 1 3 OUT 10 2 3 4 4 LED GND C 9 R 3 8 2 RH G RC Y2 HUM Y1 HUM HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VNT W1 VNT W2 VENTILATION EQUIPMENT 7 7 ZONE 2 THERMOSTAT W G C R 7 ZONE 3 THERMOSTAT W G C ZONE 4 THERMOSTAT R G W C R 5 C W Y R8222B1067 R8222B1067 R8239A1052 R R8222B1067 G 1 L2 24V L
PAGE 13
CO2 MONITOR W8900A,C 3 C7189A REMOTE AIR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 CO2 S1 C7089A OUTDOOR AIR TEMPERATURE SENSOR S T1 1 T 2 3 4 OUT 1 6 3 4 5 OUT 2 LED GND C R 1 L2 L1 (HOT) SYSTEM TRANSFORMER 2 4 FAN RELAY RH G RC Y2 HUM Y1 STAGE 1 COOL RELAY HUM VNT W1 VNT W2 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VENTILATION EQUIPMENT 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
PAGE 14
W8900B Hookup Diagrams CO2 MONITOR 4 W8900B COMPRESSOR MONITOR PC8900 C7189A REMOTE AIR TEMPERATURE SENSOR C7100 DISCHARGE AIR TEMPERATURE SENSOR CO2 S1 L S C7089A OUTDOOR AIR TEMPERATURE SENSOR T1 1 T 2 OUT 1 3 9 OUT 2 5 3 4 4 LED GND FAN RELAY C 8 R O/B 2 RH 1 3 7 COMPRESSOR CONTACTOR 6 G L2 L1 (HOT) Y2 HUM SYSTEM TRANSFORMER Y1/W1 HUM E VNT AUX VNT W2 EMERGENCY HEAT RELAY 10 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VENTILATION EQUIPMENT CHANGEOVER RELAY AUXIL
PAGE 15
CO2 MONITOR 4 C7189A REMOTE AIR TEMPERATURE SENSOR W8900B COMPRESSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 CO2 S1 L S C7089A OUTDOOR AIR TEMPERATURE SENSOR T1 1 T 2 OUT 1 3 OUT 10 2 CHANGEOVER 5 RELAY 3 4 4 LED GND FAN RELAY C 9 R 1 2 O/B RH G HUM Y1/W1 HUM E VNT AUX L2 Y2 L1 (HOT) 3 8 SYSTEM TRANSFORMER VNT HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT STAGE 2 COMPRESSOR STAGE 1 COMPRESSOR W2 6 EMERGENCY HEAT RELAY 7 AUXILIARY HEAT RELAY VENTILATI
PAGE 16
CO2 MONITOR 4 C7189A REMOTE AIR TEMPERATURE SENSOR W8900B COMPRESSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 CO2 S1 L S C7089A OUTDOOR AIR TEMPERATURE SENSOR T1 1 T 2 OUT 1 3 9 OUT 2 3 4 4 LED GND C 8 R 1 RH O/B 2 Y2 L1 (HOT) 7 SYSTEM TRANSFORMER HUM Y1/W1 HUM E VNT AUX VNT W2 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT VENTILATION EQUIPMENT R8222N1011 G L2 3 5 1 6 3 2 4 6 STAGE 1 HEAT RELAY STAGE 1 COOL RELAY HEAT CHANGEOVER VALVE 1 POWER SUPPL
PAGE 17
CO2 MONITOR 4 C7189A REMOTE AIR TEMPERATURE SENSOR W8900B COMPRESSOR MONITOR C7100 DISCHARGE AIR TEMPERATURE SENSOR PC8900 CO2 S1 L S C7089A OUTDOOR AIR TEMPERATURE SENSOR T1 1 T 2 OUT 1 3 9 OUT 2 3 4 4 LED GND 8 C R 1 RH O/B 2 Y2 L1 (HOT) HUM SYSTEM TRANSFORMER R8222N1011 G L2 3 5 1 Y1/W1 HUM E VNT AUX VNT W2 6 2 HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT 4 7 3 VENTILATION EQUIPMENT 6 STAGE 1 COOL RELAY STAGE 1 HEAT RELAY COOL CHANGEOVER VALVE 1 POWER SUPPLY
PAGE 18
W8900A,B,C Humidity Control Hookup Diagrams lines applying to the location of the sensor. If a remote sensor is used, humidity is only measured at the PC8900A location. W8900A,B,C Location Guidelines SYSTEM TRANSFORMER C L2 R L1 (HOT) 1 3 R8222N1011 2 RH G RC Y2 HUM Y1 FAN COMP HUM 1 4 3 VNT W1 VNT W2 6 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.
PAGE 19
3. 4. 5. 6. Remove the PC8900A from the wiring wallplate by pulling the PC8900A straight off the wallplate. Position the PC8900A Wiring Plate on the wall. Level the wiring plate (for appearance only) using the posts on top of the wiring plate; device functions properly even when not level. Remove wiring plate from wall and drill 3/16 in. holes in wall (if drywall) as marked. For firmer material such as plaster or wood, drill 7/32 in. holes.
PAGE 20
2. CAUTION Disconnect the power supply before connecting wiring to prevent electrical shock or equipment damage. Run cable from the W8900A-C Remote Module to a hole at the selected wall location. Pull approximately three inches of wire through the opening. Color-coded, 18-gauge thermostat wire is recommended. W8900 All wiring must comply with all applicable electrical codes, ordinances and regulations. 1. 2. 3. Loosen the PC8900A terminal screws and insert one wire beneath each terminal (1, 2, 3, 4).
PAGE 21
YES NO NO 5 FEET (1.5 METERS) NO M4476 Fig. 25. Typical location for C7189A Remote Sensor (C7189A must be mounted in living space and not in return air duct). Wiring the C7189A Remote Sensor (if needed) CAUTION Disconnect power supply before connecting to wiring to prevent electrical shock or equipment damage. CAUTION Failure to follow these wiring practices can introduce electrical interference (noise), which can cause erratic system operation.
PAGE 22
W8900 2 3 S1 S C7189 LED GND C R RH RC L1 (HOT) L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 IF MORE THAN ONE C7189 REMOTE SENSOR IS REQUIRED, REFER TO DIAGRAM BELOW. 3 IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL ON W8900. W8900 W8900 S1 S1 4 S S 4 C7189 C7189 C7189 C7189 4 C7189 C7189 C7189 C7189 C7189 C7189 C7189 C7189 C7189 SENSORS MUST BE ARRANGED IN THIS NUMBER AND CONFIGURATION FOR PROPER OPERATION. M4456A Fig. 26.
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— Mount it high enough to prevent tampering or coverage by snow, ice or debris. • The wire distance between the C7089A and W8900A-C should not exceed 200 ft. 1 WIRING HOLE THROUGH 2 STRUCTURE C7089 Mounting 1. 2. 3. Remove the sensor from the mounting clip. Mark the area on the surface where the C7089A mounting clip will be mounted. Mount the clip. W8900 3 OUT OUT LED GND M7514 Fig. 27. Typical locations for C7089A Outdoor Sensor. 1 USE APPROPRIATE MOUNTING MEANS FOR THE TYPE OF STRUCTURE.
PAGE 24
Wiring the C7100A Discharge Air Sensor (if needed) CAUTION Disconnect power supply before connecting the wiring to prevent electrical shock or equipment damage. Wiring must comply with applicable codes, ordinances and regulations. 1. Wire the C7089A Outdoor Sensor to the terminals marked OUT on the W8900A-C Remote Module. If the leadwire provided with the C7089A is not long enough, run cable to a hole at the selected C7089A location. Color-coded, 18-gauge thermostat wire is recommended. Refer to Fig.
PAGE 25
TO ENTER THE INSTALLER SETUP MODE: 1. Hold the PC8900A CHECK key until all display segments are displayed (approximately three seconds). See Fig. 29. 2. Press the up and down arrowhead keys at the same time. The display goes blank, except for up to four segments (SYSTEM, HEAT, COOL, FAN) as shown in Fig. 30. One of these segments flashes. The flashing segment indicates the current menu selection.
PAGE 26
Table 4. System Setting Options Factory-Setting Other Choices (Press Up or Down Arrowhead Keys to Change) Description M6371 M6386 PC8900A displays temperature settings and readings in °F. PC8900A displays temperature settings and readings in °C. M6387 M6372 M6373 M6374 a Description System does not control high humidity in cooling. System set to control humidity in cooling.a Can also have reheat (W8900C only). PC8900A displays setpoint times and clock times (12-hour clock) with AM and PM.
PAGE 27
Table 6. Cooling Cycle Rates. Press the up or down arrowhead key until the word HEAT is flashing on the PC8900A display. The PC8900A/W8900A-C is designed to be used on most types of heating systems. Initially, the PC8900A/W8900A-C are factory-set to be used on the following systems: PC8900A/W8900A,C models: Stage 1 and 2 heat: Conventional noncondensing gas or oil fired furnace (six cycles per hour at 50 percent load).
PAGE 28
The current day and time are now programmed. The preprogrammed schedule is activated. The preprogrammed settings can be customized or cleared. When using the preprogrammed settings as is, programming is done. To customize or create a new program, follow the steps in the Setting a Customized Program section. Operating the Comfort Center™ section shows how to make any temporary changes. Setting a Customized Program e.
PAGE 29
4. Setting Ventilator a. Press VENTILATE to display VENT when increased ventilation is desired during the WAKE period. c. Press and hold SELECT PERIOD until the desired period is displayed. SYSTEM AM CHECK HEAT SYSTEM CHECK COOL SET PT FAN SET CLOCK AUTO ON CIRC FAN SYSTEM DAY HEAT OFF COOL SELECT PERIOD HUMIDITY SET CLOCK FAN SYSTEM DAY HEAT OFF COOL SELECT PERIOD HUMIDITY HEAT/COOL SETPOINTS AUTO ON CIRC SAT HOLD VENTILATE TIME TIME CANCEL RUN RUN d.
PAGE 30
10. Programming the System Setting c. Press RUN to exit the program mode. a. Press SYSTEM until desired setting (HEAT, OFF, COOL, AUTO, EM HEAT) is displayed.
PAGE 31
4. Programming Hold for 1 to 7 Days NOTE: To cancel steps 4a. through 4f., press the CANCEL key. a. Press HOLD. HEAT SYSTEM CHECK HOLD SET CLOCK SELECT PERIOD FAN SYSTEM HEAT OFF COOL HUMIDITY DAY TIME AUTO ON CIRC VENTILATE TIME CANCEL The temperature, fan and ventilation setting are in effect until the day and time selected. At that time, the Comfort Center™ 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 display. a. Press CHECK to display the current humidity or outside temperature (if outside sensor is installed).
PAGE 33
h. Press CHECK again to display the system setting. CHECKOUT SYSTEM SYSTEM CHECK CHECK SET CLOCK SELECT PERIOD FAN SYSTEM DAY HEAT OFF COOL HUMIDITY TIME CAUTION HEAT/COOL SETPOINTS AUTO ON CIRC HOLD VENTILATE TIME CANCEL RUN M6259 i. Do not operate the cooling system when outside temperature is below 50°F (10°C). See compressor manufacturer instructions for further information. Press CHECK or RUN to return to the program.
PAGE 34
Table 10. Heat Pump System Checkout. a Result Step LED Terminals Energized Equipment Operation Remove jumper from T terminal. Off G Reconnect jumper to T terminal. On G, W1/Y1, O/Bb Remove jumper from T terminal. Off G, W1/Y1, W2, O/B Fan, first- and second-stage heat are energized. Reconnect jumper to T terminal. On G, W1/Y1, W2, AUX, O/Bb Fan, first-, second- and auxiliary-stage heat are energized. Remove jumper from T terminal.
PAGE 35
Adaptive Intelligent Recovery™ Operation Adaptive Intelligent Recovery™ operation is Honeywell’s trademark for the way the Comfort Center™ system controls the heating and cooling equipment during recovery from an energy savings setting (SLEEP, LEAVE) to a comfort setting (WAKE, RETURN). This provides additional energy savings. The advantages are: • Comfort setting is achieved at the programmed time and maintained regardless of the weather conditions; occupants come home and wake up in comfort.
PAGE 36
Heat Pump Recovery In Mild Weather When outdoor temperature is mild; for example 50°F (10°C), the recovery from energy savings is handled completely by the heat pump, without the need for auxiliary heat. The heat pump starts only after the setpoint has risen above the sensed temperature and is locked on until the comfort setpoint is reached. See Fig. 36.
PAGE 37
outdoor temperature, humidity, current setpoint, system mode, alarm out on High-Low temperature, filter status and equipment failure. See separate instructions on CM8900A and W88735B for more detailed information. Minimum-Off Timing A minimum-off timer in the Comfort Center™ control systeml assures that the cooling compressor or heat pump compressor does not come on again for at least five minutes after it turns off.
PAGE 38
dehumidification requirement is still not met, cooling starts again. This switching continues until the dehumidification and cooling setpoints are met. This feature assures that the occupants do not experience excessive temperature drop due to the need for dehumidification.
PAGE 39
setup mode for a few seconds. After the RUN key is pressed, the discharge air temperature is displayed when the CHECK key is pressed (until another power outage occurs). NOTE: When a discharge air temperature sensor is installed and configured in an application, we recommend interrupting the power supply briefly before leaving the site. This removes the discharge air temperature from the display when the CHECK key is pressed and avoids confusion.
PAGE 40
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 a ACTION COMMUNICATIONS WITH THE HOME SYSTEM AND W8900 CANNOT BE ESTABLISHED. • CHECK CONNECTIONS BETWEEN HOME SYSTEM AND COMMUNICATION MODULE. • CHECK COMMUNICATIONS BUS. • RECONFIGURE PC8900 CONNECTION BETWEEN PC8900 AND W8900 CANNOT BE ESTABLISHED. • RECONFIGURE PC8900.
PAGE 41
IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION. 1. PRESS THE CHECK KEY. PC8900 DISPLAY SHOWS: POSSIBLE CAUSE ACTION W8900 CANNOT READ OUTDOOR AIR TEMPERATURE. • CHECK CONNECTIONS BETWEEN C7089 AND W8900. PC8900 CONFIGURED FOR OUTDOOR TEMPERATURE SENSOR, BUT NOT INSTALLED. • RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY. WRONG OUTDOOR TEMPERATURE SENSOR IS INSTALLED. • CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS BEING USED. W8900 CANNOT READ REMOTE SPACE TEMPERATURE.
PAGE 42
SYMPTOM TEMPERATURE CHANGES OCCUR AT THE WRONG TIMES. POSSIBLE CAUSE ACTION PC8900 PROGRAMMED INCORRECTLY. • CHECK THE PROGRAM TIMES FOR THE PERIOD IN QUESTION. BE SURE THAT AM AND PM INDICATIONS ARE CORRECT. MAKE SURE THE CURRENT DAY AND TIME ARE CORRECT. REPROGRAM IF NECESSARY. ADAPTIVE INTELLIGENT RECOVERY™ IS SELECTED.
PAGE 43
SYMPTOM HUMIDIFICATION EQUIPMENT WILL NOT COME ON IN HEATING. POSSIBLE CAUSE ACTION PC8900 IS NOT CONFIGURED PROPERLY. • RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING (APPLIES TO W8900A,B ONLY). HUMIDITY SETTING IS TO LOW. • ADJUST HUMIDITY SETTING USING PC8900 IS CONFIGURED FOR FROST CONTROL. • TO PREVENT FROST FROM FORMING ON WINDOWS, SOME CALLS FOR HUMIDIFICATION WILL NOT BE ALLOWED. REFER TO INSTALLATION AND OPERATION SECTION. NO POWER TO HUMIDIFIER.
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GLOSSARY ADAPTIVE INTELLIGENT RECOVERY™ SETTING The time when the PC8900A operates the heating or cooling equipment to return the house from the energy savings to the comfort temperature. The PC8900A starts the recovery period earlier than the WAKE or RETURN period so the house will be at the comfort setting by your chosen time. CHECK LIGHT (RED) This light glows as a prompt to examine messages in the CHECK LIST section.