Honeywell perfect climate comfort center control system User Manual

Perfect Climate Comfort Center™

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.

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.

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.

• 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 CO

monitor available.

• Optional remote communications available.

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

68- 0173- 3

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.

Models:

The PC8900A Comfort Center™ Control Panel mounts in the living space and accurately measures and controls room temperature and humidity. The W8900A-C Remote Module provides a wiring panel and switching for the Perfect Climate Comfort Center™ Control System. See Table 1.

System Components and Accessories (See Fig. 1):

C7089A1002 Outdoor Sensor: Used to measure outdoor tem-

perature.

C7100A1015 Discharge Air Sensor: Used to sense tempera-

ture in discharge or return air.

C7189A1001 Remote Indoor Sensor: Used for remote sensor

applications.

CM8900A1009 Communication Module: Used for remote

communication.

W8735B1003 Telephone Access Module: Used for remote

communication.

202689A Mounting Plate Accessory: Used when C7189A

Remote Indoor Sensor cannot cover wall marks from old thermostat.

205224A Wall Cover Plate: Used when PC8900A Control

Panel cannot cover wall marks from old thermostat.

32007496-001 Replacement Door: Used for PC8900A Control

Panel.

Dimensions:

205224A: See Fig. 2. C7089A: See Fig. 3.

C7100A: See Fig. 4. C7189A: See Fig. 5. PC8900A: See Fig. 6. W8900A-C: See Fig. 7.

Operating Ambient Temperature Range:

NOTES: System is capable of turning on heat at 0°F (-18°C).

C7089A: -40° to 128°F (-40° to 53°C). C7100A: 40° to 150°F (4° to 66°C). C7189A: 40° to 95°F (4° to 35°C). PC8900A: 40° to 110°F (4° to 43°C). W8900A-C: -40° to 150°F (-40° to 66°C).

Shipping Temperature Range (All Components): -20° to

150°F (-29° to 66°C).

Operating Relative Humidity Range (All Components):

5 percent RH to 90 percent RH, noncondensing.

Mounting Means:

C7089A Outdoor Sensor: Mounts outside of living space using

locally obtained mounting hardware.

C7100A Discharge Air Sensor: Mounts in discharge air duct,

near air exchanger in a 2 x 4 in. outlet box or on a flat duct or plenum surface. The temperature sensor probe passes through a 7/8 in. knockout in the 2 x 4 in. outlet box.

C7189A Remote Indoor Sensor: Mounts directly on the wall

using mounting screws and anchors provided.

PC8900A Control Panel:

Without Remote Sensor: Mounts directly on the wall in liv-

ing space using mounting screws and anchors provided.

With Remote Sensor: Mounts directly on the wall in a

closet or other convenient location using mounting screws and anchors provided.

W8900A-C Remote Module: Mounts directly on the wall, near

HVAC equipment or cold air return, using mounting screws and anchors provided.

Table 1. W8900A-C Models.

Model

System Type

W8900A Conventional 2

Use with

Heat

Stages

Cool

Stages

Ven t

Adjustment

Humidity

Adjustment Heat

Humidity

Adjustment Cool Use with

yes yes yes PC8900A

W8900B Heat pump 3 2 yes yes yes PC8900A

W8900C Conventional 2 2 yes yes

Models with O and B terminals have single stage cooling.

Uses reheat. See Operation section.

yes

PC8900A

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).

2. Home and Building Control Customer Relations

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.

68-0173—3 2

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. 39 in the

Operation section for sensor resistance characteristics. C7100A Discharge Air Sensor: See Fig. 39 in the Operation

section for sensor resistance characteristics. C7189A Remote Indoor Sensor: NTC Sensor. See Fig. 40 in

the Operation section for sensor resistance characteristics.

Auxiliary Heat and Emergency Heat Indication: PC8900A

display indicates when auxiliary heat and emergency heat

are activated.

Input Ratings:

20 to 30 Vac, 50/60 Hz.

Heat Pump Failure Input (L Terminal on W8900B Models):

24 Vac load, 50/60 Hz, 0.3 VA load.

CO2 Monitor Input (CO

els): 24 Vac load, 50/60 Hz, 0.3 VA load.

Terminal on all W8900A-C Mod-

Output Ratings:

Humidity Control Output Relay: 50 VA at 24 Vac. Ventilation, W1, W2, Y1, Y2, E, G, O, B, AUX, Y1/W1:

a. 1.5A running, 3.5A inrush at 200,000 cycles

(30 Vac).

b. 1.5A running, 7.5A inrush at 100,000 cycles

(30 Vac). Run: 40% power factor minimum. Inrush: 50% power factor minimum.

Temperature Setting Range: PC8900A: 45° to 88°F

(7° to 31°C).

Humidity Setting Range:

PC8900A: 10 to 80% RH. Cooling: 40 to 80% RH. Heating: 10 to 80% RH.

Calibration: C7089A, C7100A, C7189A, and PC8900A are

factory calibrated and require no field calibration.

Monitors: The W8900A-C allows for connection of a

Monitor with uncommitted contacts.

PC8900A

Comfort Center™

Control Panel

C7189A

Remote Indoor Sensor

C7089A

Outdoor Sensor

W8735B

Telephone Access

Module

CM8900A

Communication Module

Fig. 1. System components and accessories.

W8900A-C

Remote Module

C7100A

Discharge Air Sensor

3 68-0173—3

6 (152)

7/8 (22)

1-1/2 (38)

3-1/4 (83)

8-1/2 (216)

M7513

Fig. 2. Dimensions for 205224A Wall Cover

Plate in in. (mm).

3/4

(19)

13-1/4 (336)

Fig. 4. Dimensions for C7100A Discharge Air Sensor in in. (mm).

M4488

Fig. 3. Dimensions for C7089A Outdoor Sensor

Mounting Clip in in. (mm).

1-3/16

1-13/16

(30)

(46)

1-3/16

(30)

1-13/16

(46)

M4461

4-5/8 (117)

2-3/4 (70)

M4465

FRONT VIEW SIDE VIEW FRONT VIEW (COVER OFF)

Fig. 5. Dimensions for C7189A Remote Indoor Sensor in in. (mm).

68-0173—3 4

1-1/8

(29)

4-5/8 (117)

3-1/4

(83)

2-3/4 (70)

3-3/8

(86)

7/8

(22)

7/8

(22)

6 (152)

3-1/4 (83)

6-3/8 (162)

(102)

1-5/8 (41)

8-3/4 (222)

7-13/16 (197)

(102)

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

HEAT OFF COOL

HUMIDITY

DAY

TIME

FAN

AUTO ON CIRC

VENTILATE

HEAT/COOL SETPOINTS

HOLD

RUN

NOTE: PC8900 SHOWN WITH COVER REMOVED.

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.

Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube.

If you have questions, call Honeywell Inc. at 1-800-468-1502, Monday through Friday, 7:00 a.m. to 5:30 p.m., Central time.

M6356

1/2 (12)

3/4 (19)

(51)

NOTE: W8900 SHOWN WITH COVER REMOVED.

4-7/8 (124)

(4) 3/8 (5)

6-3/8 (163)

M6355

Fig. 7. Dimensions for W8900A-C Remote

Module in in. (mm).

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow instructions can damage the product or cause a hazardous condition.

2. Check the ratings on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After completing installation, use these instructions to check out product operation.

5 68-0173—3

CAUTION

Disconnect power supply before wiring to prevent electrical shock or equipment damage.

Mounting the W8900A-C Remote Module

Locate the W8900A-C in the equipment room near the HVAC equipment. See Fig. 8.

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. Grasp the top edge of the W8900A-C cover, either at

the center or both corners, and pull it off fro m t h e b a s e .

2. Locate the four mounting holes. See Fig. 9.

3. Position the W8900A-C on wall or cold air return. Level

the W8900A-C for appearance only; the device will function properly even when not level. Use a pencil to mark the mounting holes on the wall.

WALL

MOUNTING HOLES (4)

W8900

FURNACE OR BOILER

WATER HEATER

M4459

Fig. 8. W8900A-C location example.

4. Remove the W8900A-C from the wall, and drill 3/16 in.

holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill 7/32 in. holes. Gently tap anchors (provided) into drilled holes until flush with the wall.

5. Reposition the W8900A-C over the holes. Loosely insert the four mounting screws (included) into the holes.

MOUNTING SCREWS (4)

M4463

Fig. 9. Mounting W8900A-C Remote Module.

Wiring the W8900A-C to the HVAC Equipment

CAUTION

Disconnect power supply before connecting wiring to prevent electrical shock or equipment damage.

Wiring must comply with applicable codes, ordinances, and regulations.

IN REPLACEMENT INSTALLATION:

1. Locate the terminal wiring strip on the old thermostat.

2. Note the wire color for each wiring terminal used.

3. Remove the wires connected to the old thermostat and

other controls. Tape off unused wires.

4. Use Table 2 or 3 to identify the W8900A-C terminal labels. Connect the same loads that were connected to the old thermostat to the W8900A-C Remote Module with a new bundle of 18-gauge color-coded thermostat wire; see Fig. 10. See Fig. 11 through 20 for wiring diagrams for specific equipment applications.

68-0173—3 6

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 spe-

cific equipment applications.

FOR STRAIGHT CONNECTION— STRIP 5/16 IN. (8 MM)

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

FOR WRAPAROUND CONNECTION— STRIP 7/16 IN. (11 MM)

overtighten; device can be damaged.

M4464

Fig. 10. Proper wiring technique for

W8900A-C and PC8900A.

Table 2. Conventional Applications (W8900A or C).

W8900A, C Terminal Designation Function Existing Thermostat Designation

1 PC8900A Control Panel — 2 PC8900A Control Panel — 3 PC8900A Control Panel — 4 PC8900A Control Panel — B Heating, changeover valve B

C 24 Vac Transformer Common C

Carbon Dioxide Monitor —

VNT VNT Relay —

G Fan Relay G GND Ground — HUM Humidity Relay — OUT Outdoor Air Temperature Sensor —

O Cooling, Changeover Valve O

R 24 Vac System Transformer R

RC 24 Vac Cooling Transformer RC RH 24 Vac Heating Transformer RH

S, S1 Remote Air Temperature Sensor — See note a Fan Control—Evaporative Cooling F See note b Heat Pump Contactor P

T, T1 Discharge Air Temperature Sensor —

W1 Heating Relay W W1 Stage 1 Heat Relay W1 W2 Stage 2 Heat Relay W2 Y1 Cooling Relay Y Y1 Stage 1 Cool Relay Y1

Y2 Stage 2 Cool Relay Y2 See note c Fan Control (Honeywell dual fuel thermostat [T834]) 1 See note c Fan Control (Honeywell dual fuel thermostat [T834]) 2 See note d Filter Light X

none Remote Timer Contacts Z

PC8900A/W8900A,C are not compatible with evaporative cooling equipment.

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.

7 68-0173—3

Table 3. Heat Pump Applications (W8900B).

Existing Thermostat

Designations

(Customer Specials)

W8900B Terminal

Designations

Function

Existing Thermostat

Designations

(Standard)

1 PC8900A Control Panel — —

2 PC8900A Control Panel — —

3 PC8900A Control Panel — —

4 PC8900A Control Panel — —

AUX

Stage-3 heat control (strip heat) W3 —

B Heating, changeover valve B —

C 24 Vac transformer common C X,B

Carbon dioxide monitor — —

E Emergency heat relay E K

VNT VNT relay — —

G Fan relay G F

GND Ground — —

L System monitor L L

O Cooling, changeover valve O R

R 24 Vac system transformer R V

S, S1 Remote Air Temperature Sensor — —

T, T1 Discharge Air Temperature Sensor — —

Y1/W1

Stage-2 heat control (compressor) W2 H2,Y,R4

Compressor contactor — RS

Compressor contactor Y M

Stage-1 cool control Y1 C1,M

Stage-1 heat control W1 H1,R3

Y2 Stage-2 cool control Y2 C2

None Clogged filter switch or common connection X X1,X2,C

None Defrost — P

None HSII Control Panel — L,C,H

None LEDs — A,A1,A2,Z,C,L

None LO and HI speed fan relays — R1,R2

None Momentary circuit, changeover — O

None Outdoor thermistor T A

Out

AUX controls the auxiliary heat like W2, and allows additional stages of auxiliary heat with outdoor thermostats while maintaining the proper second stage anticipation.

For systems without 2nd stage heat, configure W2 to No.

For systems requiring separate W1 and Y1 terminals for proper heat pump operation, refer to Fig. 18 and 19.

Replace existing sensor with C7089A Outdoor Sensor.

External temperature readout, T relay — —

68-0173—3 8

WIRING DIAGRAMS

W8900A,C Hookup Diagrams

CO2 MONITOR

L1 (HOT)

HEATING TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

VENTILATION EQUIPMENT

PC8900

GND

HUM

VNT

W8900A,C

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

C7100 DISCHARGE AIR TEMPERATURE SENSOR

FAN RELAY

STAGE 2 COOL RELAY

STAGE 1 COOL RELAY

STAGE 1 HEAT RELAY

STAGE 2 HEAT RELAY

C7089A OUTDOOR AIR TEMPERATURE SENSOR

L1 (HOT)

COOLING TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH FOR SINGLE HEAT TRANSFORMER APPLICATIONS.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER) DURING INSTALLER SETUP .

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

Fig. 11. Hookup diagram for heating/cooling system in conventional system with multiple transformers.

9 68-0173—3

M4479D

L1 (HOT)

SYSTEM TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

CO2 MONITOR

PC8900

GND

HUM

VNT

W8900A,C

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

C7100 DISCHARGE AIR TEMPERATURE SENSOR

C7089A OUTDOOR AIR TEMPERATURE SENSOR

FAN RELAY

STAGE 2 COOL RELAY

STAGE 1 COOL RELAY

STAGE 1 HEAT RELAY

STAGE 2 HEAT RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

VENTILATION

EQUIPMENT

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4478D

Fig. 12. Hookup diagram for 1-stage or 2-stage heating and cooling in conventional system with single transformer.

68-0173—3 10

L1 (HOT)

SYSTEM TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

PC8900

CO2 MONITOR

GND

HUM

VNT

W8900A,C

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

C7100 DISCHARGE AIR TEMPERATURE SENSOR

FAN RELAY

STAGE 1 COOL RELAY

C7089A OUTDOOR AIR TEMPERATURE SENSOR

VENTILATION

EQUIPMENT

PILOT

1ST OPERATOR

DUAL VALVE COMBINATION GAS CONTROL

POWER SUPPLY. PROVIDE DISCONNECT

MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

COM

2ND OPERATOR

MAIN VALVE

IGNITER

MV/PV

PILOT GAS SUPPLY

SENSOR

GND (BURNER)

PILOT BURNER GROUND

24V GND

S8610U

24V

TH-W

VENT DAMPER PLUG

LIMIT CONTROLLER

SENSE

D892 VENT DAMPER

SPARK

M4489D

Fig. 13. Hookup diagram for heating/cooling intermittent pilot gas burning ignition system.

11 68-0173—3

HUMIDIFIER OR

DEHUMIDIFIER EQUIPMENT

VENTILATION

EQUIPMENT

CO2 MONITOR

PC8900

W8900A,C

GND

HUM

VNT

ZONE 2 THERMOSTAT

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

ZONE 3 THERMOSTAT

C7100 DISCHARGE AIR TEMPERATURE SENSOR

C7089A OUTDOOR AIR TEMPERATURE SENSOR

ZONE 4 THERMOSTAT

L1 (HOT)

R8239A1052

CYRG

24V

ZONE 1 VALVE

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

USE ONE R8239 FOR EVERY FOUR ZONES.

USE FOR 3-WIRE ZONE VALVE OR DAMPERS.

ZONES 2, 3, 4 CAN BE CONTROLLED BY ADDITIONAL PC8900/W8900 OR OTHER THERMOSTATS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

R8222B1067

ZONE 2 VALVE

R8222B1067

ZONE 3 VALVE

R8222B1067

ZONE 4 VALVE

M4491D

Fig. 14. Hookup diagram for 3-wire zone valves in Series 20 heating system with zone controls.

68-0173—3 12

CO2 MONITOR

PC8900

L1 (HOT)

SYSTEM TRANSFORMER

HUMIDIFIER OR

DEHUMIDIFIER EQUIPMENT

GND

HUM

VNT

W8900A,C

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

C7100 DISCHARGE AIR TEMPERATURE SENSOR

FAN RELAY

STAGE 1 COOL RELAY

C7089A OUTDOOR AIR TEMPERATURE SENSOR

VENTILATION EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

L1 (HOT)

OIL PRIMARY

Fig. 15. Hookup diagram in oil heating/electric cooling system (oil primary has its own transformer).

M4490D

13 68-0173—3

W8900B Hookup Diagrams

L1 (HOT)

VENTILATION EQUIPMENT

CO2 MONITOR

COMPRESSOR MONITOR

PC8900

SYSTEM TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

W8900B

GND

HUM

VNT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.

IF SEPARATE Y1 AND W1 TERMINALS ARE REQUIRED, REFER TO FIGURES 18 AND 19.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

CONFIGURE PC8900 FOR NO CONNECTION TO TERMINALS Y2, E, AUX AND W2 FOR

SINGLE-STAGE HEAT PUMP SYSTEM.

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

O/B

Y1/W1

AUX

C7100 DISCHARGE AIR TEMPERATURE SENSOR

CHANGEOVER

RELAY

FAN RELAY

COMPRESSOR CONTACTOR

EMERGENCY HEAT RELAY

AUXILIARY HEAT RELAY

C7089A OUTDOOR AIR TEMPERATURE SENSOR

M4483D

Fig. 16. Hookup diagram for 2-stage heat/1-stage cool in heat pump system.

68-0173—3 14

CO2 MONITOR

L1 (HOT)

COMPRESSOR MONITOR

PC8900

SYSTEM TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

GND

HUM

VNT

W8900B

Y1/W1

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

O/B

AUX

C7100 DISCHARGE AIR TEMPERATURE SENSOR

CHANGEOVER RELAY

FAN RELAY

STAGE 2 COMPRESSOR

STAGE 1 COMPRESSOR

EMERGENCY HEAT RELAY

C7089A OUTDOOR AIR TEMPERATURE SENSOR

VENTILATION

EQUIPMENT

AUXILIARY HEAT RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE

(HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE OR COOLING MODE.

JUMPER Y2 AND W2 TERMINALS.

IF NO EMERGENCY HEAT RELAY, FIELD INSTALL JUMPER E TO AUX.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

Fig. 17. Hookup diagram of 3-stage heat/2-stage cool heat pump system.

M4485D

15 68-0173—3

L1 (HOT)

SYSTEM TRANSFORMER

HUMIDIFIER OR DEHUMIDIFIER EQUIPMENT

CO2 MONITOR

COMPRESSOR MONITOR

PC8900

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

R8222N1011

O/B

Y1/W1

AUX

C7100 DISCHARGE AIR TEMPERATURE SENSOR

STAGE 1 HEAT RELAY

STAGE 1 COOL RELAY

HEAT CHANGEOVER VALVE

C7089A OUTDOOR AIR TEMPERATURE SENSOR

GND

HUM

VNT

W8900B

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

CONNECT HEATING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR CHANGEOVER IN HEATING MODE.

CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4486D

Fig. 18. Hookup diagram for heat pump application requiring separate W1 and Y1 terminals with heating changeover.

68-0173—3 16

L1 (HOT)

HUMIDIFIER OR

DEHUMIDIFIER EQUIPMENT

CO2 MONITOR

COMPRESSOR

MONITOR

PC8900

SYSTEM TRANSFORMER

C7189A REMOTE AIR TEMPERATURE SENSOR

OUT

LED

R8222N1011

O/B

Y1/W1

AUX

C7100 DISCHARGE AIR TEMPERATURE SENSOR

C7089A OUTDOOR AIR TEMPERATURE SENSOR

STAGE 1 COOL RELAY

STAGE 1 HEAT RELAY

COOL CHANGEOVER VALVE

GND

HUM

VNT

W8900B

VENTILATION

EQUIPMENT

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH.

DURING INSTALLER SETUP, CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE (HUMIDIFIER) OR COOLING MODE (DEHUMIDIFIER).

W8900 ALLOWS CONNECTION OF A CO MONITOR WITH UNCOMMITTED CONTACTS.

CONNECT COOLING CHANGEOVER VALVE TO R8222N1011 AND CONFIGURE PC8900 FOR CHANGEOVER IN COOLING MODE.

CONNECT G, Y2, E, AUX, AND W2 TERMINALS AS REQUIRED.

SEE VENTILATION INSTRUCTIONS FOR WIRING.

GROUNDING THE GND TERMINAL IS NOT RECOMMENDED.

CONNECTION FOR CM8900A REMOTE COMMUNICATIONS MODULE.

M4487D

Fig. 19. Hookup diagram for heat pump application requiring separate Y1 and W1 terminals with cooling changeover.

17 68-0173—3

W8900A,B,C Humidity Control Hookup Diagrams

W8900A,B,C

lines applying to the location of the sensor. If a remote sensor is used, humidity is only measured at the PC8900A location.

SYSTEM TRANSFORMER

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE.

R8222N1011

HUM

VNT

FAN

COMP

M18588

Fig. 20. Hookup diagram connecting cooling humidity

control in parallel with temperature control.

W8900A,B,C

SYSTEM TRANSFORMER

L1 (HOT)

HUMIDIFIER

HUM

VNT

Location Guidelines

• Choose a location for the PC8900A where it is safe from tampering.

• Locate the PC8900A on an inside wall, about 5 ft (1.5m) above the floor. The PC8900A can also be mounted horizontally on a standard 2 x 4 in. (51 x 102 mm) outlet box.

• The wire distance between the PC8900A and W8900A-C should not exceed 200 ft.

• Install the PC8900A in an area with good air circulation at average temperature. Avoid the following locations because they can introduce errors in temperature measurements: — Hot or cold areas caused by concealed pipes or ducts. — Drafts from windows, doors, fireplaces or other heat/

cool sources.

— Convection or radiant heat from the sun or electrical

equipment. — Unheated areas on the other side of the wall location. — Dead air areas behind doors, furniture, curtains or in

corners and alcoves.

Mounting

1. Mark the mounting location on the wall for the PC8900A or outlet box.

2. Run cable from the unit to a hole at the selected wall location. Pull approximately three inches of wire through the hole. Color-coded 18-gauge thermostat wire is recommended. See Fig. 22.

NOTE: If the old thermostat leaves marks on the wall that

the PC8900A does not cover, order part no. 205224A Wall Cover Plate to mount between the PC8900A and the wall. See Fig. 23. Use the following instructions and at step 7, put the wall cover plate between the wall and wiring plate.

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

JUMPER R TO RH TO RC FOR SINGLE TRANSFORMER APPLICATIONS.

CONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING MODE.

USE OF A SEPARATE POWER SUPPLY TO RUN THE HUMIDIFIER IS RECOMMENDED.

M4997

Fig. 21. Hookup diagram connecting humidifier

using separate transformers for humidity

control in the heating mode.

Mounting the PC8900A Control Panel

NOTE: The following location guidelines apply only if a

remote sensor is not part of the installation. If a remote sensor is installed, the PC8900A can be installed in any convenient location, with these guide-

68-0173—3 18

WIRES THROUGH WALL

WALL ANCHORS (3)

USE THREE MOUNTING HOLES THAT BEST FIT APPLICATION

WALL

MOUNTING HOLES (4)

MOUNTING SCREWS (3)

M4466

Fig. 22. Mounting PC8900A Wiring Plate.

3. Remove the PC8900A from the wiring wallplate by pulling the PC8900A straight off the wallplate.

4. Position the PC8900A Wiring Plate on the wall.

5. Level the wiring plate (for appearance only) using the

posts on top of the wiring plate; device functions properly even when not level.

6. 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. Gently tap anchors (provided) into drilled holes until flush with the wall.

NOTE: When using a wall cover plate, be sure to

place the wall cover plate between the wall and the wiring plate.

7. Position wiring plate over holes in wall or outlet box, pulling wires through wiring opening. Loosely insert three mounting screws into holes that best fit the application.

8. Tighten the mounting screws.

9. Reinstall the PC8900A on the wallplate by pressing the

PC8900A directly onto the wallplate.

WALL ANCHORS (3)

WIRES THROUGH WALL OPENING

CHOOSE THREE MOUNTING HOLES

THAT BEST FIT APPLICATION.

PC8900 COMFORT CENTER CONTROL PANEL

205224A WALL COVER PLATE

SYST

CHECK

PC8900 WIRING PLATE

MOUNTING SCREWS (3)

M7512A

Fig. 23. Mounting PC8900A Wiring Plate and 205224A Wall Cover Plate to wall.

Wiring the PC8900A

CAUTION

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lightning ballasts and large power distribution panels. Failure to follow these wiring practices can introduce electrical interference (noise), which can cause erratic system operation. Use shielded cable to reduce interference if rerouting of wiring is not possible. Ground the shielded cable only to GND terminal on W8900A-C.

IMPORTANT

Erratic temperature readings can occur as a result of any of the wiring practices described below. These practices must be avoided to assure proper operation. Use shielded cable to reduce interference if rerouting of wiring is not possible.

— Do not route thermostat wiring with building power

wiring, next to control contactors or near light dim-

ming circuits, electric motors or welding equipment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground.

19 68-0173—3

CAUTION

Disconnect the power supply before connecting wiring to prevent electrical shock or equipment damage.

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 color of the wire that is attached to each terminal number to later match the colors with the terminals on the W8900A-C Remote Module. See Fig. 10 and 24 for wiring technique and wiring diagram.

2. Tighten screw terminals securely.

3. Push the excess wire back into the hole. Plug the hole

with nonhardening caulk, putty or insulation to prevent drafts from affecting PC8900A operation.

IMPORTANT

In replacement applications, more than four wires can be available. In these applications, tape off the unused wires at the PC8900A location and the W8900A-C location.

Mounting the C7189A Remote Sensor (if needed)

2. 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

GND

Location Guidelines

• Choose a location where the C7189A is safe from tampering.

• Locate the C7189A on an inside wall, about 5 ft (1.5m) above the floor. The C7189A can also be mounted vertically on a standard 2 x 4 in. (51 x 102 mm) outlet box.

• The wire distance between the C7189A and W8900A-C should not exceed 200 ft.

• Install the C7189A in an area with good air circulation at average temperature. Avoid the following locations because they can introduce errors in sensor measurements (see Fig. 25): — Hot or cold areas caused by concealed pipes or ducts. — Drafts from windows, doors, fireplaces or other heat/

cool sources.

— Convection or radiant heat from the sun or electrical

equipment. — Unheated areas on the other side of the wall location. — Dead air areas behind doors, furniture, curtains or in

corners and alcoves.

Mounting

1. Mark the mounting location on the wall for the C7189A Remote Indoor Sensor or junction box.

NOTE: Order 202689A Coverplate when C7189A can-

not cover wall marks from old thermostat.

1234

NOTE WHICH COLOR WIRE IS ATTACHED TO EACH TERMINAL.

FOUR WIRES ARE REQUIRED FOR PROPER OPERATION. IF FEWER THAN FOUR ARE AVAILABLE, ADDITIONAL WIRES MUST BE RUN TO PC8900 LOCATION. IF MORE THAN FOUR ARE AVAILABLE, TAPE OFF UNUSED WIRES.

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL ON W8900.

IN REPLACEMENT APPLICATIONS, PC8900 REPLACES OLD

THERMOSTATS, HUMIDISTATS, VENTILATION CONTROLS, AND AIR CLEANER INDICATORS. BE SURE TO REMOVE OLD DEVICES AND TAPE OFF UNUSED WIRES.

M7519

Fig. 24. Wiring diagram for PC8900A Control Panel to

W8900A-C Remote Module.

68-0173—3 20

YES

5 FEET

(1.5 METERS)

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

Failure to follow these wiring practices can introduce electrical interference (noise), which can cause erratic system operation.

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lightning ballasts, and large power distribution panels. Use shielded cable to reduce interference if rerouting wire is not possible. Ground the shielded cable to the ground terminal on the W8900A-C.

IMPORTANT

Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. These practices must be avoided to assure proper operation. Use shielded cable to reduce interference if rerouting of sensor wiring is not possible.

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light dimming circuits, electric motors or welding equip-

ment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground.

CAUTION

Disconnect power supply before connecting to wiring to prevent electrical shock or equipment damage.

Wiring must comply with applicable codes, ordinances and regulations.

1. Wire the C7189A Remote Indoor Sensor to the W8900A-C Remote Module terminals S1 and S. For an example of general wiring of the C7189A, see Fig. 26.

2. Push excess wire back into the hole. Plug the hole with nonhardening caulk, putty or insulation to prevent drafts from affecting the C7189A and PC8900A performance.

3. Remove the C7189A Cover.

4. Mount the C7189A on the wall or junction box using the

screws and anchors provided.

5. Level the C7189A for appearance only. The device functions properly even when not level.

6. Install the C7189A Cover.

21 68-0173—3

W8900

GND

L1 (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.

LED

W8900

C7189

C7189 C7189

SENSORS MUST BE ARRANGED IN THIS NUMBER AND CONFIGURATION FOR PROPER OPERATION.

Fig. 26. Wiring diagram for C7189A Remote Sensor to W8900A-C Remote Module.

Mounting the C7089A Outdoor Sensor (if needed)

Location Guidelines

• Locate the C7089A Outdoor Sensor where it will be safe from tampering.

C7189 C7189

C7189 C7189 C7189

C7189

M4456A

• Choose an outdoor location for the sensor where there is good air circulation at average outdoor temperature. See Fig. 27. Locate the sensor where it can measure the true outdoor ambient temperature: — On a flat surface is best. — Avoid locations that can introduce errors in sensor

measurements such as areas of direct sunlight or high temperature, or areas where hot or cold air is blowing out of a fan or vent such as next to the compressor discharge line in the outdoor unit.

68-0173—3 22

— 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.

Mounting

1. Remove the sensor from the mounting clip.

2. Mark the area on the surface where the C7089A mount-

ing clip will be mounted.

3. Mount the clip.

GND

C7089

W8900

OUT

LED

WIRING HOLE THROUGH

STRUCTURE

Fig. 27. Typical locations for C7089A

Outdoor Sensor.

Wiring the C7089A Outdoor Sensor (if needed)

CAUTION

Failure to use the following wiring practices can introduce electrical interference (noise), which can cause erratic system operation.

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lightning ballasts, and large power distribution panels. Use shielded cable to reduce interference when rerouting wires is not possible. Ground the shielded cable to the ground terminal on the W8900A-C.

M7514

USE APPROPRIATE MOUNTING MEANS FOR THE TYPE OF STRUCTURE.

PLUG WIRING HOLE WITH NONHARDENING CAULK OR PUTTY.

IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL

ON W8900.

Fig. 28. Wiring diagram for C7089A Outdoor Sensor

to W8900A-C Remote Module.

IMPORTANT

Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Use shielded cable to reduce interference if rerouting of sensor wiring is not possible. These practices must be avoided to assure proper operation:

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light dimming circuits, electric motors or welding

equipment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground.

M4457

23 68-0173—3

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. 28 for an example of general wiring for the C7089A. Pigtail wiring can be used.

2. Mount the C7089A in its mounting clip.

3. Plug wiring hole using nonhardening caulk or putty.

Mounting the C7100A Discharge Air Sensor (if needed)

Location Guidelines

• Locate the C7100A Discharge Air Sensor in the air duct or plenum where it can sample an average air temperature.

• Avoid locations where air stratification can cause sensor errors.

• The distance between the C7100A and W8900A-C should not exceed 200 ft.

Mounting

Wiring the C7100A Discharge Air Sensor (if needed)

CAUTION

Failure to use the following wiring practices can introduce electrical interference (noise), which can cause erratic system operation.

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lightning ballasts, and large power distribution panels. Use shielded cable to reduce interference when rerouting wires is not possible. Ground the shielded cable to the ground terminal on the W8900A-C.

IMPORTANT

Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Use shielded cable to reduce interference if rerouting sensor wiring is not possible. These practices must be avoided to assure proper operation:

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light dimming circuits, electric motors or welding equip-

ment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground. — If the discharge air temperature fails to display when

the check key is pressed, see the Troubleshooting

Section.

TO MOUNT ON A FLAT DUCT OR PLENUM SURFACE:

1. Cut a 7/8 in. (22 mm) hole in the duct or plenum surface at the desired location.

2. Insert the sensor probe into the duct or plenum with inlet holes facing the air stream.

3. If necessary, use the flange provided as a template to mark and drill four holes for 8-32 mounting screws.

4. Fasten the sensor to the duct or plenum surface with the four 8-32 sheetmetal screws provided.

TO MOUNT IN A 2 X 4 IN. JUNCTION BOX:

1. Cut a 7/8 in. (22 mm) hole in the duct or plenum surface at the desired location.

2. Remove the center rear knockout from the 2 x 4 in. junction box and insert the sensing probe through the knockout with the flange flat against the junction box.

3. Using the flange (provided) as a template, mark and drill four holes in the junction box and the duct or plenum surface for 8-32 mounting screws.

4. Insert sensor probe through both the junction box knockout and the 7/8 in. (22 mm) hole drilled in the duct or plenum and fasten the junction box and sensor to the duct or plenum surface.

CAUTION

Disconnect power supply before connecting the wiring to prevent electrical shock or equipment damage.

Wiring must comply with applicable codes, ordinances and regulations.

Wire the C7100A Discharge Air Sensor to the terminals marked T and T1 on the W8900A-C Remote Module. Use 1/4 in. female quick connects on the C7100A.

INSTALLER SETUP

IMPORTANT

Installer setup must be done for the HVAC equipment and the PC8900A/W8900A-C to operate properly.

The installer setup mode is used by the installer to configure the PC8900A/W8900A-C for the HVAC equipment used at the installation (heating, cooling, ventilation, humidification, air cleaning) and to configure the PC8900A operation (changeover mode, remote sensors, and outdoor sensors).

68-0173—3 24

TO ENTER THE INSTALLER SETUP MODE:

638

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.

TO CHANGE TO ANOTHER SELECTION:

1. Press the up or down arrowhead key until the desired segment is flashing.

2. Once the desired segment is flashing, press the CHECK key for options within that segment. The options are SYSTEM, HEAT, COOL and FAN.

3. Press RUN to exit the installer setup.

Table 4. System Setting Options

Factory-Setting Description

System switch is configured for manual changeover HEAT-OFFCOOL or EM HT-HEAT-OFF-COOL.

M6361

Five-minute compressor protection is on; calls for cooling (heat pump) are followed by a five-minute enforced

M6362

shutdown.

System does not have a C7189A Remote Indoor Sensor.

M6363

System does not have a C7100A Discharge Air Sensor.

M6364

System uses PC8900A temperature only. If the system is configured for a remote sensor (SENS REM Y),

M6365

temperature control is averaged between C7189A Remote Indoor Sensor and PC8900A Control Panel.

System does not have a C7089A Outdoor Sensor.

M6366

System has an Energy Recovery Ventilator (for example, Honeywell ER90). Calls for ventilation, close

M6367

Communications should always be configured to N. If CM8900A Communication Module is present, it

M6368

changes to Yes automatically.

W8900B model only. O/B terminal energized in heating only. Use this setting for heat pumps with heating

M6369

changeover.

System has a humidifier that is used in the heating mode.

M6370

System Options

When SYSTEM is flashing, the following list of options pertaining to the equipment and sensors connected to the system appears on the PC8900A display. To make each selection, press the CHECK key. See Table 4 for setting options.

SYSTEM OFF AUTO

SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT

Fig. 29. All segments on display.

Other Choices (Press

Up or Down Arrowhead

Keys to Change) Description

M6375

M6376

M6377

M6378

M6379

M6380

M6381

M6382

M6383

M6385

AUX HEAT SET PT COOL SET PT

FAN

AUTO ON CIRC

M6360

System switch is configured for automatic changeover HEAT-OFF-COOL-AUTO or EM HT-HEAT-OFF-COOL-AUTO.

No compressor protection exists. Calls for cooling (heat pump) can occur immediately.

System does have a C7189A Remote Indoor Sensor.

System does have a C7100A Discharge Air Sensor.

System uses C7189A Remote Indoor Sensor only. Be sure the system is configured for remote sensor (SENS REM Y).

System does have a C7089A Outdoor Sensor.

System has an outside air damper. Calls for ventilation close VNT contacts and activate system fan.

System has no ventilation equipment. A call for ventilation activates the system fan.

Communication module is activated. W8900A-C automatically changes to this setting when communication is received.

W8900B model only. O/B terminal energized in cooling only. Use this setting for heat pumps with cooling changeover.

System has no humidifier.

25 68-0173—3

Table 4. System Setting Options

Other Choices (Press

Up or Down Arrowhead

Factory-Setting Description

System set to control humidity in cooling.

M6371

(W8900C only).

PC8900A displays temperature settings and readings in °F.

M6372

PC8900A displays setpoint times and clock times (12-hour clock) with AM and PM.

M6373

System is set for Adaptive Intelligent Recovery™. When recovering from setback modes, programmed times

M6374

indicate when recovery ends. (See Operation section for description).

The humidity option can only be set for heat or cool. If both are set to Y, it will not honor either one.

Can also have reheat

Keys to Change) Description

System does not control high humidity in cooling.

M6386

PC8900A displays temperature settings and readings in °C.

M6387

PC8900A displays setpoint times and clock times (24-hour clock) with military time.

M6388

System is set for conventional recovery. When recovering from setback modes, programmed times indicate when recovery

M6389

begins.(See Operation section for description.)

Heat Options

When HEAT is flashing, refer to Table 5 for the options pertaining to the heat equipment that appear in the PC8900A display after each press of the CHECK key. HEAT and its list of options appear only when the system allows field selection of cycle rates, and only stages present in the remote module hardware are shown.

SYSTEM

CHECK

SYSTEM

HEAT COOL

FAN

ONE OF THESE SEGMENTS WILL BE FLASHING.

M6401

Fig. 30. Initial display for installer setup.

Table 5. Heating Cycle Rates.

Display Shows

AUX HT CPH 6bEM. HT. CPH 6

AUX HT EM. HT.

System

Gas or Oil Forced Air 6

Cycles per

Hour Setting

Stage 1 Stage 2

W1 CPH 6

W2 CPH 6

Electric Heat 9 W1 CPH 9 W2 CPH 9 AUX HT CPH 9 EM. HT. CPH 9

Single Stage Heat Pump,

3 W1 CPH 3 W2 CPH 3 AUX HT CPH 3 EM. HT. CPH 3 Hydronic Heat, Condensing Gas Furnaces

Radiant Floor Heat, Gravity 1 W1 CPH 1 W2 CPH 1 AUX HT CPH 1 EM. HT. CPH 1

Cooling-only Application; no

Not connected W1 CPH NC W2 CPH NC AUX HT CPH NC EM. HT. CPH NC heat sources connected

N/A

4.5 W1 CPH 4.5 W2 CPH 4.5 AUX HT CPH 4.5 EM. HT. CPH 4.5

2.5 W1 CPH 2.5 W2 CPH 2.5 AUX HT CPH 2.5 EM. HT. CPH 2.5

2 W1 CPH 2 W2 CPH 2 AUX HT CPH 2 EM. HT. CPH 2

1.5 W1 CPH 1.5 W2 CPH 1.5 AUX HT CPH 1.5 EM. HT. CPH 1.5

When W2 is not used, configure W2 cycle rate to NC (not connected).

Factory setting.

Use these cycle rate settings if faster or slower cycling is required.

68-0173—3 26

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). PC8900A/W8900B models: Stage 1, 2 and 3 heat: Heat pump (three cycles per hour at 50 percent load).

The cycle requirements for each stage of heat can be changed to match the type of heating system used. See Table 5 for the cycle rate options available and the equipment that corresponds with each cycle rate.

Cool Options

When COOL is flashing, see Table 6 for options for the cooling equipment stages that appear in the display in the following order after each press of the CHECK key.

Table 6. Cooling Cycle Rates.

Cycles per

Display Shows

Hour

System

Recommended setting

N/A

Natural gas air

Setting

3 Y1 CPH 3

9 Y1 CPH 9 Y2 CPH 9

6 Y1 CPH 6 Y2 CPH 6

1 Y1 CPH 1 Y2 CPH 1

Stage 1 Stage 2

Y2 CPH 3 (factory setting)

(factory

setting)

conditioning

Heating-only application

N/A

Use these cycle rate settings if faster or slower cycling is

Not

Y1 CPH NC Y2 CPH NC

connected

4.5 Y1 CPH 4.5 Y2 CPH 4.5

2.5 Y1 CPH 2.5 Y2 CPH 2.5

2 Y1 CPH 2 Y2 CPH 2

1.5 Y1 CPH 1.5 Y2 CPH 1.5

required.

Fan Options

When FAN is flashing, refer to Table 7 for the options pertaining to the fan equipment that appear in the display in the following order after each press of the CHECK key.

Table 7. Fan Setting Options.

Display Description

When PC8900A calls for heat,

PC8900A also calls for fan

M6390

(Electric Heat).

No fan overrun in cooling. 80-second fan overrun after PC8900A

M6392 M6393

Option not used on the W8900B model.

PROGRAMMING PC8900A

The Comfort Center™ control panel must have 24 Vac to program.

The current day and time need to be set. This activates the preprogram in the Comfort Center™ panel. See Table 8 for the preprogram settings.

Table 8. PC8900A Preprogram.

Period Start Time

Te mp

Saturday

WAKE (6:00 AM) (70°F) (78°F) (AUTO) (OFF)

LEAVE (8:00 AM) (62°F) (85°F) (AUTO) (OFF)

RETURN (6:00 PM) (70°F) (78°F) (AUTO) (OFF)

SLEEP (10:00 PM) (62°F) (82°F) (AUTO) (OFF)

Heating

Cooling

Te mp

Fan

Setting

Vent

Setting

Other Choices (Press

Up or Down Arrowhead

Keys to Change) Description

When PC8900A calls for heat, fan is energized by equipment

M6391

(Conventional).

ends call for cooling.

Setting the Current Day and Time

NOTES:

— Always press the keys with a fingertip or similar

blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard.

— Check the Glossary section for definitions of

unfamiliar words.

1. Press SET CLOCK. The display shows a time and day.

2. Press and hold DAY until the current day appears in the

display.

3. Press and hold a TIME key until the current time appears in the display. Be sure AM or PM appear as desired.

4. Press RUN to exit the SET CLOCK program mode.

27 68-0173—3

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

Planning your Program

Plan a schedule before programming. Leave any period blank when no setting is required. When an outdoor sensor is part of the system, enter a frost setting. The humidity and frost settings are the same for the entire program.

Programming the First Day

When changing the existing program, go to step 7a. When clearing the program and starting over, proceed as follows.

NOTE: Press the RUN key at any time to exit the program-

ming mode.

1. Clearing Current Program

a. Press SELECT PERIOD.

SYSTEM

SELECT PERIOD

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

b. Hold CANCEL until display shows PROG CLR.

SYSTEM

CHECK

CANCEL

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

2. Setting Day, Time, and Setpoints

a. Press SELECT PERIOD until display shows WAKE.

SYSTEM

SELECT PERIOD

b. Press DAY until display shows MON.

DAY

c. When display reads COOL SET PT, press HEAT/

COOL SETPOINTS to switch to HEAT SET PT.

HEAT/COOL

SETPOINTS

d. Press and hold a TIME key until the display shows

the desired starting time. The time changes in tenminute increments.

TIME

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

HEAT SET PT COOL

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

HEAT SET PT COOL

WAKE

M6206

M6205

HEAT SET PT COOL

WAKE

M6206

HEAT SET PT COOL

WAKE

M6207

M6209

M6215

e. Press and hold the up or down arrowhead key until

the display shows the desired temperature.

SYSTEM

CHECK

SET

FAN

SYSTEM

CLOCK

HEAT OFF COOL

AUTO ON CIRC

DAY

SELECT

VENTILATE

PERIOD

TIME

CANCEL

HEAT/COOL SETPOINTS

HOLDHUMIDITY

RUN

HEAT SET PT COOL

f. Press HEAT/COOL SETPOINTS to switch to COOL

SET PT.

HEAT/COOL

SETPOINTS

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT COOL SET PT

WAKE

NOTE: The time is used for both heating and cooling.

When you change the time while setting the cooling temperatures, the time is also changed for heating.

g. Press and hold the up or down arrowhead key until

the display shows the desired temperature.

SYSTEM

CHECK

SET

FAN

SYSTEM

CLOCK

HEAT OFF COOL

AUTO ON CIRC

DAY

SELECT

VENTILATE

PERIOD

TIME

CANCEL

HEAT COOL SET PT

HEAT/COOL SETPOINTS

HOLDHUMIDITY

RUN

NOTE:

— When the numbers do not move while you are

holding the up or down arrowhead key, the setting limit (45°F and 88°F) is reached.

— When set for auto changeover, there must be 3°F

between the heating and cooling setpoints. When setting the cooling setpoint with the heating setpoint at 68°, the cooling setpoint can be no lower than 71°. And when cooling is set for 70°, the heat setpoint changes to 67°. The PC8900A automatically pushes the alternate setpoint so you can adjust the setpoint to its desired setting.

— When set for manual changeover, the 3° differential

between the heating and cooling setpoint does not apply.

3. Setting Fan

IMPORTANT

The FAN and VENTILATOR settings are the same for heating and cooling. The FAN setting for heating cannot be set for AUTO and the cooling set for CIRC.

a. Press FAN until FAN AUTO, FAN ON or FAN CIRC

is displayed, as desired.

SYSTEM

FAN

AUTO ON CIRC

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

VENTILATE

TIME

NOTES: — AUTO means the fan only runs when heating or

cooling is running. — ON means the fan runs during this entire period. — CIRC means the fan runs at least 30 percent of the

time during this period, including when the heating or

cooling system is running.

HOLDHUMIDITY

RUN

HEAT COOL SET PT

WAKE

M6210

M6232

FAN

AUTO

FAN

AUTO

FAN

AUTO

FAN

AUTO

M6231

M6213

68-0173—3 28

4. Setting Ventilator

a. Press VENTILATE to display VENT when increased

ventilation is desired during the WAKE period.

FAN

AUTO ON CIRC

SYSTEM

CHECK

SET CLOCK

SELECT

PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT COOL SET PT

WAKE

FAN

AUTO

M6213

b. When normal ventilation is desired, press VENTI-

LATE until VENT is not displayed.

VENTILATE

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT COOL SET PT

WAKE

FAN AUTO

M6212

5. Programming LEAVE, RETURN and SLEEP

a. Repeat steps 2a through 4b for each period to be

programmed on Monday.

The Comfort Center™ Monday program is now complete.

Programming The Remaining Days

6. Copying the First Day Program

a. Hold down the DAY key until all the days of the

week have appeared on the screen.

SYSTEM

CHECK

DAY

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

SUN SLEEP

RUN

M6233

b. Press RUN key to save and start the program.

SYSTEM

RUN

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

M6230

NOTE: The Monday program is now copied to all seven

days of the week. If copy fails, start over (see Programming the First Day section).

7. Changing the Program

a. Press SELECT PERIOD to enter the programming

mode.

SYSTEM

SELECT PERIOD

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

MON

RUN

b. Press DAY until the desired day is displayed.

SYSTEM

CHECK

DAY

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT SET PT COOL

WAKE

HEAT SET PT COOL

WAKE

SAT

M6234

M6235

c. Press and hold SELECT PERIOD until the desired

period is displayed.

SELECT PERIOD

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT SET PT COOL

SAT

d. Press HEAT/COOL SETPOINTS to switch between

HEAT SET PT and COOL SET PT.

HEAT/COOL

SETPOINTS

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT SET PT COOL

LEAVE

e. Press and hold a TIME key until the desired start

time is displayed.

TIME

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

SYSTEM

f. Press and hold up or down arrowhead key until the

desired temperature is displayed.

SYSTEM

CHECK

SET

FAN

SYSTEM

CLOCK

HEAT OFF COOL

AUTO ON CIRC

DAY

SELECT

VENTILATE

PERIOD

TIME

CANCEL

HEAT/COOL SETPOINTS

HOLDHUMIDITY

RUN

HEAT SET PT COOL

g. Follow steps 3a and 4a when changes to the fan

and ventilator settings are desired.

IMPORTANT

When in a program, pressing the CANCEL key until PROGRAM CLR appears (approximately three seconds) cancels your entire program and you need to start again with step 3.

8. Canceling One Program Period

a. Press CANCEL while you are in the period to be

cancelled. The programmed time, temperature, vent and fan settings for that period for that day disappear.

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

HEAT SET PT COOL

WAKE

9. Starting the Program

a. Press RUN to start the program.

SYSTEM

CHECK

RUN

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

LEAVE

FAN AUTO

M6237

SAT LEAVE

M6238

FAN

AUTO

M6210

M6230

M6236

M10017

29 68-0173—3

10. Programming the System Setting

a. Press SYSTEM until desired setting (HEAT, OFF,

COOL, AUTO, EM HEAT) is displayed.

SYSTEM

HEAT OFF COOL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

SYSTEM

M6227

HEAT: The Comfort Center™ program controls the heating system. OFF: Both the heating and cooling systems are off. OFF flashes in the display. COOL: The Comfort Center™ program controls the cooling system. AUTO: The Comfort Center™ program automatically changes between heating and cooling, depending on the indoor temperature. (AUTO must be configured by the installer.) EM HEAT:(Select Models Only): The Comfort Center™ program controls only the emergency heat.

11. Programming Humidity Setting

a. Press HUMIDITY. The display shows HUMID with a

percentage.

SYSTEM

CHECK

HUMIDITY

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

SYSTEM

FAN

SETPOINTS

HEA

T OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6228

b. Press and hold the up or down arrowhead key until

desired humidity setting is displayed. The available choices range from 10 to 80 percent in 5 percent increments.

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6229

12. Programming Frost Setting (If Applicable)

a. Press HUMIDITY a second time and the display

shows FROST.

SYSTEM

CHECK

HUMIDITY

NOTE: The factory setting is 5, but the range is 0 to

b. Press up or down arrowhead key until the desired

setting is displayed.

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6239

10. When there is too much condensation, lower the number but if the air is dry, change the setting to a higher number.

SYSTEM

CHECK

SET

CLOCK

SELECT

PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6240

c. Press RUN to exit the program mode.

SYSTEM

RUN

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

M6230

The Comfort Center™ program is now customized.

Operating the Comfort Center™ Control System

Changing Current Period Settings

Temporary changes to the current period allow for those times when someone comes home early, stays up late, or plans an evening out. The settings are in effect until the next regularly scheduled period starts.

1. Temperature Setpoint

a. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if changing heat setpoint) or COOL SET PT (if changing cool setpoint).

SYSTEM

HEAT/COOL

SETPOINTS

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

b. Press and hold up or down arrowhead key until the

desired temperature is displayed.

SYSTEM

CHECK

SET

FAN

SYSTEM

CLOCK

HEAT OFF COOL

AUTO ON CIRC

DAY

SELECT

VENTILATE

PERIOD

TIME

CANCEL

2. Fan Setting

a. Press FAN to display the AUTO, ON or CIRC fan

setting, as desired.

SYSTEM

FAN

AUTO ON CIRC

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

3. Ventilation Setting

a. Press VENTILATE to display VENT or not, as

desired.

SYSTEM

CHECK

VENTILATE

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

Changing Settings for One Week or Less

This feature allows setting one temperature that the Comfort Center™ program holds continuously for up to one week, until the day and time programmed.

HEAT SET PT COOL

HEAT/COOL SETPOINTS

HOLDHUMIDITY

RUN

HEAT SET PT COOL

TEMPORARY

FAN AUTO

M6216

FAN AUTO

VENT

M6209

M6221

M6224

68-0173—3 30

4. Programming Hold for 1 to 7 Days

a. Press HOLD.

SYSTEM

CHECK

HOLD

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

b. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if holding heat setpoint) or COOL SET PT (if holding cool setpoint).

SYSTEM

CHECK

HOLD

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

c. Press and hold up or down arrowhead key until

desired holding temperature is displayed.

SYSTEM

HEAT/COOL SETPOINTS

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/C

OOL

FAN

SYSTEM

HOLD

SETPOI

HEAT OFF COOL

AUTO ON CIRC

DAY

HUMIDITY

VENTILATE

TIME

RUN

d. Press FAN for fan setting and VENTILATE for venti-

lation setting during hold.

FAN

AUTO ON CIRC

VENTILATE

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

VENTILATE

TIME

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

VENTILATE

TIME

HOLDHUMIDITY

RUN

HOLDHUMIDITY

RUN

HEAT SET PT COOL

e. Press DAY until the desired end day is displayed.

SYSTEM

CHECK

DAY

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

f. Press a TIME key until the desired end time is dis-

played.

SYSTEM

TIME

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT COOL SET PT

HEAT SET PT COOL

FRI

FAN AUTO

VENT

M6247

M6244

M6245

M6246

M6241

M6242

NOTE: To cancel steps 4a. through 4f., press the

CANCEL key.

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.

Changing Settings for an Indefinite Amount of Time

The hold feature keeps one temperature that the Comfort

Center™ program holds continuously until CANCEL is

pressed to resume the program.

5. Programming Indefinite Hold

a. Press HOLD.

SYSTEM

CHECK

HOLD

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

b. Press HEAT/COOL SETPOINTS to display either

HEAT SET PT (if holding heat setpoint) or COOL SET PT (if holding cool setpoint).

SYSTEM

HEAT/COOL

SETPOINTS

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/C

OOL

FAN

SYSTEM

HOLD

SETPOI

HEAT OFF COOL

AUTO ON CIRC

DAY

HUMIDITY

VENTILATE

TIME

RUN

c. Press and hold up or down arrowhead key until

desired holding temperature is displayed.

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/C

OOL

FAN

SYSTEM

HOLD

SETPOI

HEAT OFF COOL

HUMIDITY

AUTO ON CIRC

DAY

VENTILATE

TIME

RUN

d. Press FAN for desired fan setting and VENTILATE

for desired ventilation setting during hold.

FAN

AUTO ON CIRC

VENTILATE

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

VENTILATE

TIME

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HOLDHUMIDITY

RUN

HEAT SET PT COOL

HEAT COOL SET PT

M6241

HEAT SET PT COOL

M6242

HEAT SET PT COOL

M6243

FAN AUTO

M6244

FAN AUTO

VENT

M6245

NOTE: To cancel steps 5a. through 5d., press the

CANCEL key.

31 68-0173—3

Canceling Program Settings.

Each period can be canceled.

6. Canceling Period

a. Press DAY until the desired day appears in the dis-

play.

SYSTEM

CHECK

DAY

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

THU

LEAVE

b. Press and hold SELECT PERIOD until the desired

period to cancel for that day appears in the display.

SYSTEM

SELECT PERIOD

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

THU

RETURN

c. Press CANCEL. The time and temperature disap-

pears from the display.

CANCEL

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

HEAT SETPT

RETURN

d. Press RUN to return to normal operation.

SYSTEM

RUN

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

M6230

Review Program Settings and Current Readings

1. Review All of Program Settings

IMPORTANT

Changes can be made to the program when using this review process.

— Press SELECT PERIOD to enter the program.

SYSTEM

SELECT PERIOD

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

MON

RUN

— Press DAY for each day of the week and press

SELECT PERIOD to review each period. The display shows the day, period, time, temperature setpoints, fan and vent settings.

SYSTEM

CHECK

DAY

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

— Press RUN to exit the review.

SYSTEM

CHECK

RUN

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT SET PT COOL

WAKE

HEAT SET PT COOL

WAKE

SAT

MON

M6230

M6249

M6250

COOL

M6251

M6234

M6235

2. Review Current Setpoints and Readings

Use the following instructions to check the setpoints for the current period only and to check the actual humidity and outdoor readings.

NOTE: Return to the program at any time by pressing RUN.

a. Press CHECK to display the current humidity or

outside temperature (if outside sensor is installed).

SYSTEM

CHECK

b. Press CHECK again to display the current humidity

reading.

CHECK

c. Press HUMIDITY to display the setpoint.

HUMIDITY

d. Press CHECK to display two temperatures and

HEAT SET PT or COOL SET PT in the display.

CHECK

e. Press HEAT/COOL SETPOINT to display the other

setpoint.

HEAT/COOL

SETPOINTS

f. Press CHECK again to display the current FAN

setting.

CHECK

g. Press CHECK again to display the current VENT

setting.

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

SYSTEM

FAN

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6200

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6252

M6253

HEAT COOL SET PT

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

M6255

HEAT SET PT COOL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

SYSTEM

HEAT OFF COOL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

HEAT/COOL

FAN

SETPOINTS

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

FAN AUTO

M6257

M6256

M6258

68-0173—3 32

h. Press CHECK again to display the system setting.

CHECK

SYSTEM

CHECK

SET

CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

VENTILATE

TIME

SYSTEM

HOLDHUMIDITY

RUN

M6259

i. Press CHECK or RUN to return to the program.

SYSTEM

RUN

CHECK

SET CLOCK

SELECT PERIOD

CANCEL

HEAT/COOL

FAN

SYSTEM

SETPOINTS

HEAT OFF COOL

AUTO ON CIRC

DAY

HOLDHUMIDITY

VENTILATE

TIME

RUN

MON

M6230

Activating or Deactivating Keyboard Lockout

When the keyboard lockout is activated, the programs, time and day, humidity and installer setup information cannot be changed. However, hold, temporary settings and the system setting can be changed. Use the following steps to check or change the keyboard setting.

1. Press and hold RUN until OPEN KEY or LOCK KEY show in the display (approximately three seconds). The display returns to normal when RUN is no longer pressed.

2. To change the setting, press RUN a second time until the other display appears.

CHECKOUT

CAUTION

Do not operate the cooling system when outside temperature is below 50°F (10°C). See compressor manufacturer instructions for further information.

IMPORTANT

• W8900A-C must have ac power to perform self-test.

• Five-minute time delay on compressor does not function during checkout.

Perform the following test as a check of all the W8900A-C functions. If W8900A-C does not respond as indicated,

replace the W8900A-C.

Checkout is activated from the W8900A-C Remote Module. The PC8900A Control Panel does not have to be connected to use the checkout. If the PC8900A is connected, the PC8900A displays Wait during checkout.

NOTE: The W8900A-C (and PC8900A, if connected),

returns to normal when the checkout is interrupted for two minutes.

1. Start the checkout by disconnecting sensor wires from S, S1, T and T1 (if attached).

2. Connect a jumper between S and S1 terminals.

3. Connect a jumper between T and T1 terminals.

4. Turn the power off and on. The LED should be on. Fol-

low the steps in Table 9 or 10.

NOTE: The sequence restarts after the last step in the

table.

5. After completing the steps in the table, remove the T to T1 and S to S1 jumpers and reinstall the sensor wires (if applicable). The W8900A-C LED blinks.

Table 9. Conventional System Checkout.

Result

Step

Remove jumper from T terminal. Off

Reconnect jumper to T terminal. On

Remove jumper from T terminal. Off

LED Terminals Energized Equipment Operation

G, O / B

G, W1, O/B

G, W1, W2, O/B

Fan relay is energized.

Fan and first-stage heat are energized.

Fan, first- and second-stage heat are energized.

Reconnect jumper to T terminal. On G, Y1 First- and second-stage heat are de-energized. Fan and

first stage cooling are energized.

Remove jumper from T terminal. Off G, Y1, Y2 Fan, first- and second-stage cooling are energized.

Reconnect jumper to T terminal. On G, Y1, Y2, HUM Fan, first- and second-stage cooling with the humidifier are

energized.

Remove jumper from T terminal. Off G, Y1, Y2, HUM, VNT Fan, first- and second-stage cooling with the humidifier and

ERV are energized.

Reconnect jumper to T terminal. On None All equipment is de-energized.

Remove jumper from T1, S and S1

On None Return PC8900A to normal operation.

terminals.

This is the terminal sequence for W8900A1012.

On conventional models with the O/B relay (changeover) populated, it is energized in the heating mode. The default mode for power up is heat. If the installer test mode is cycled through cooling to all relays off with the intent of repeating the test, the O/B relay is not energized until the first stage of heat is cycled on.

33 68-0173—3

Table 10. Heat Pump System Checkout.

Result

Step

LED Terminals Energized Equipment Operation

Remove jumper from T terminal. Off G Fan relay is energized.

Reconnect jumper to T terminal. On

Remove jumper from T terminal. Off

Reconnect jumper to T terminal. On G, W1/Y1, W2, AUX,

Remove jumper from T terminal. Off

G, W1/Y1, O/B

G, W1/Y1, W2, O/B

O/B

G, E , O/ B

Fan and first-stage heat are energized.

Fan, first- and second-stage heat are energized.

Fan, first-, second- and auxiliary-stage heat are energized.

First- and second-stage heat are de-energized. Fan and emergency heat are energized.

Reconnect jumper to T terminal. On

Remove jumper from T terminal. Off

Reconnect jumper to T terminal. On

Remove jumper from T terminal. Off

G, W1/Y1, O/B

G, W1/Y1, Y2, O/B

G, W1/Y1, Y2, O/B HUM

G, W1/Y1, Y2, O/B HUM, VNT

Fan and first-stage cooling are energized.

Fan, first- and second-stage cooling are energized.

Fan, first- and second-stage cooling with the humidifier are

energized.

Fan, first- and second-stage cooling with the humidifier and

VNT are energized.

Reconnect jumper to T terminal. On None All equipment is de-energized.

Remove jumper from T1, S and S1

On None Returns PC8900A to normal operation.

terminals.

The polarity configuration of the reversing valve relay (O/B) determines if the O/B is always energized on first call for heat or cool. If the reversing valve energizes with heat, then it de-energizes with cooling. Factory setting is for O/B to energize with a call for heat.

O/B is energized based on installer setup or configuration.

Installer Display of all Segments and Product Codes (Optional)

1. Press and hold CHECK key until all segments of the display are lighted. See Fig. 31.

2. Press the CHECK key four more times to view each of the following items: — Order specification number of the Comfort Center™

control system.

— Manufacturing date code and software revision

numbers of the Comfort Center™ control system. — Order specification number of the remote module. — Manufacturing date code and software revision

numbers of the remote module.

3. Press the CHECK key to return to normal operation.

SYSTEM OFF AUTO

SYSTEM

CHECK

SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT

Fig. 31. All segments on display.

AUX HEAT SET PT COOL SET PT

FAN

AUTO ON CIRC

M6400

OPERATION

The PC8900A, C7089A, C7189A, C7100A and CO2 monitor sense the temperature, humidity and CO living space. This information is then transferred to the W8900A-C Remote Module, which activates the proper equipment based on the programmed settings.

Conventional vs. Adaptive Intelligent Recovery™ Operation

Conventional Recovery

Conventional temperature recovery starts the heating or cooling system at the programmed set time. See Fig. 32. Using conventional recovery requires setting the program period times earlier than the area is occupied so the area will be comfortable. The program may need to be adjusted periodically to accommodate for weather and seasonal changes. The conventional recovery method is used when Adaptive Intelligent Recovery™ operation is disabled.

70 F

60 F

SLEEP

conditions in the

WAKE

SETPOINT TEMPERATURE

ACTUAL TEMPERATURE

M6404

68-0173—3 34

Fig. 32. Conventional recovery ramp.

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.

• Drafts from low temperature discharge air are minimized during occupied periods.

• Comfort Center™ control system automatically uses the more economical first stage of the heat pump as the primary heat source during the heat mode recovery, avoiding the use of the expensive second-stage of heating (auxiliary heat).

• Comfort and energy savings can be achieved in both heating and cooling.

• Reduces heat pump and air conditioner compressor cycling, extending equipment life.

Adaptive Intelligent Recovery™ operation is used during recovery from energy savings. It is bypassed when configured for conventional recovery but not when setpoint is temporarily changed. When Adaptive Intelligent Recovery™ operation is bypassed, the system operates the stages of equipment like a conventional control.

COMPRESSOR SETPOINT

AUXILIARY HEAT SETPOINT

ROOM TEMPERATURE

WAKE

M6406A

Fig. 33. Heat pump Adaptive Intelligent Recovery™ ramp.

Operation

Seasonal weather changes allow the Adaptive Intelligent Recovery™ ramp to change on a daily basis and still meet the comfort needs of the occupants. In the fall, heating loads are light so recovery begins very late in the energy savings period. As fall changes to winter, loads increase and the Adaptive Intelligent Recovery™ ramp shifts so recovery begins earlier each day. Conversely, recovery begins later each day as heating loads decrease from winter to spring. See Fig. 34 and 35.

70 F

PC8900A Used with W8900A,C Remote Module (Conventional Heat/Cool Applications)

During recovery, the Comfort Center™ program calculates the amount of time required to bring the living space from the current room temperature (achieved in the energy savings mode) to the comfort temperature programmed for the comfort mode. When that time is reached, the present setpoint changes from the energy savings setpoint to the comfort setpoint. The result is that the living space temperature is at the programmed setpoint at the programmed time, providing the occupants with the maximum comfort. See Fig. 33.

PC8900A Used with W8900B Remote Module (Heat Pump Applications)

During recovery, the Comfort Center™ program works to achieve comfort in the same manner, by calculating the amount of time required to bring the living space from the current room temperature to the comfort temperature programmed for the comfort mode. The living space temperature reaches the programmed setpoint at the programmed time so the occupants achieve maximum comfort.

Another way the Comfort Center™ program minimizes auxiliary heat usage is by having two recovery ramps: one for stage-one compressor and one for auxiliary heat.

SETPOINT TEMPERATURE

ACTUAL

60 F

SLEEP

WAKE

HEATING MODE

TEMPERATURE

M6185

Fig. 34. Fall to winter Adaptive

Intelligent Recovery™ ramp.

70 F

SETPOINT TEMPERATURE

ACTUAL

60 F

SLEEP

WAKE

TEMPERATURE

M6186

Fig. 35. Winter to spring Adaptive

Intelligent Recovery™ ramp.

Energy Savings Period

In mild to moderate weather, the PC8900A calls on the heat pump only when the sensed temperature falls below the setpoint. Under mild to moderate conditions, the more costly auxiliary heat is not needed. In severe weather, the heat pump cycles only when the sensed temperature falls below setpoint and auxiliary heat cycles continuously. See Fig. 36 through 38.

35 68-0173—3

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.

COMPRESSOR SETPOINT

AUXILIARY HEAT SETPOINT

ROOM

WAKE

COMPRESSOR:

UXILIARY HEAT:

Fig. 36. Adaptive Intelligent Recovery™ ramp for

a heat pump in mild weather (50°F).

In Moderate Weather

When outdoor temperature is close to the balance point of the heat pump, the heat pump runs continuously during the recovery period and auxiliary heat cycles if necessary. See Fig. 37.

TEMPERATURE

OFF

M6187

COMPRESSOR SETPOINT

AUXILIARY HEAT SETPOINT

ROOM TEMPERATURE

OFF

COMPRESSOR:

AUXILIARY

HEAT:

M6189

WAKE

Fig. 38. Adaptive Intelligent Recovery™ ramp for

a heat pump in severe weather (0°F).

Comfort Period

In mild weather, the heat pump cycles continuously to maintain the sensed temperature within 1°F of the setpoint. In moderate weather, the heat pump cycles longer, minimizing the need for auxiliary heat. The heat pump runs the majority of the time in severe weather and only shuts off for brief periods using auxiliary heat to maintain temperature within 1°F of setpoint. See Fig. 36 through 38.

THERMAL PERFORMANCE

During severe weather, the PC8900A actually controls closer to the setpoint than a conventional control. This is because the heat anticipator is replaced by two electronic control strategies—cycling by heat anticipation and proportional plus integral (P+I) control.

COMPRESSOR SETPOINT

AUXILIARY HEAT SETPOINT

ROOM

WAKE

COMPRESSOR:

UXILIARY HEAT:

TEMPERATURE

OFF

M6188

Fig. 37. Adaptive Intelligent Recovery™ ramp for

a heat pump in moderate weather (20°F).

In Severe Weather

When the outdoor temperature is below the balance point of the heat pump, the heat pump and auxiliary heat run continuously in the recovery period. See Fig. 38.

Electronic cycling by heat anticipation acts like a traditional heat anticipator except that it never needs adjusting for various control circuit load currents. It cycles off the heating system slightly before the room temperature reaches the setpoint to keep heat that remains in the ductwork from overheating the room.

In severe weather, a conventional control with a heat anticipator tends to turn off the system too soon so the effective setpoint is somewhat below the setpoint. In very cold weather, the difference between setpoint and effective control point can be 5°F or 6°F (2°C or 3°C) with a conventional control. This phenomenon is called droop.

Proportional plus integral action eliminates droop by adjusting the on time of the stage until the control point matches the setpoint. The PC8900A maintains the space temperature within 1°F of the setpoint when the temperature has stabilized after an energy saving period.

This zero droop performance provides improved occupant comfort and energy savings. Occupants do not need to continually adjust thermostat settings to maintain desired temperature, even during severe weather.

Remote Communications

Adding the CM8900A Communications Module and the W8735B Telephone Access Module gives the PC8900A/ W8900A-C remote communications. Users are able to control current setpoint and system settings. They can monitor the

68-0173—3 36

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. The minimum-off timer is triggered when the compressor goes off and when the system switch is changed. If the compressor turns off when the setpoint is changed, then the minimum-off timer is triggered. The minimum-off timer operates during the first stage of cooling on the W8900A and C. The minimum-off timer operates during the first stage of both heating and cooling on the W8900B. The minimum-off timer can be disabled in the installer setup mode and can be overridden in the checkout mode.

Fan Control

The fan comes on when any of these conditions are present (it can take up to 20 seconds for the fan to turn on).

Humidity Control (W8900A and B)

IMPORTANT

The humidity configuration can only be set for heat or cool by the installer. If configured for both, the Comfort Center™ control system ignores both settings and no humidity control is activated.

Heat Mode

Heat humidification is activated when the sensed RH is below the setpoint RH and the fan is on. When a ventilator is installed and configured and the RH is above the setpoint, the Comfort Center™ program calls for ventilation to lower the humidity.

Cool Mode

Cool dehumidification is activated when the sensed RH is above the setpoint. This can cause overcooling; see W8900C Humidity Control section.

Dehumidification equipment can be controlled in many ways. See Installation section for hookup drawings.

NOTES:

The installer setup has the ability to extend fan operation following a cooling cycle. When selected, the fan run time at the end of a cooling cycle is extended 80 seconds.

FAN ON: This setting means the fan runs 100 percent of the time during this period.

FAN AUTO: The AUTO setting means the fan runs only with the heating or cooling system.

FAN CIRC: When the fan is set to CIRC, the fan runs at least 30 percent of the time, including the time the fan is on while the heating or cooling system is running. When the heating or cooling system is not running at all, the fan runs for ten minutes on, and 20 minutes off. Protection against fan short cycling is built into the device.

Ventilation Control

When the Comfort Center™ program is configured for ventilation, the ventilator contacts are closed, activating high speed ventilation equipment in response to any of the following conditions:

• Ventilation request from the user.

• High CO

• High humidity condition while in the heating mode.

• Programming.

The ventilation control is set for a 20-second cycle so the user can wait up to 20 seconds for the ventilation to start after the request is made.

When the Comfort Center™ program is configured for no ventilation, the system fan is activated in response to a call for ventilation. When the Comfort Center™ system is configured for a VNT damper, calls for ventilation close the VNT damper contacts and activate the system fan.

NOTE: Each period can have a ventilation program.

condition (measured by CO2 monitor).

Humidity Control with Fan

Select models of the W8900A-C can be configured to control humidity levels while the fan is energized. This type of humidity control does not require the heat output to be energized. In order for the humidity terminals (“HUM”) to energize, the following conditions must be met:

1. System switch must be in the heat mode or in Auto mode with heat being the last call.

2. There must be a call for humidity (sensed relative humidity [RH] is below RH setpoint).

3. Fan terminal (“G”) must be energized through programming or by pressing the fan button on the PC8900A.

Frost Control

The frost Control needs an outdoor sensor to be activated. The Comfort Center™ control system calculates the possibility of condensation or frost forming by using the outside temperature and inside temperature to determine the dewpoint. When the dewpoint would cause frost or condensation, the humidification request will not be honored. The frost setting has a value range of zero to ten with zero representing glass with poor insulation and ten representing glass with perfect insulation.

NOTE: Set the frost setting to 10 to severely limit the frost

control.

W8900C Humidity Control

The W8900C can be configured to control humidity levels in both the heat and cool modes. A humidifier is connected to the HUM terminals. The HUM contacts close and activate a humidifier when the sensor RH is below the setpoint RH. Dehumidification equipment is controlled by the Y1,Y2, and G terminals. These contacts close to activate the air conditioning equipment when the sensed RH is above the setpoint RH.

The reheat feature is designed to keep the occupants comfortable. If the cooling setpoint is reached, but the dehumidification setpoint is not satisfied, the Comfort Center™ program turns on the heat. When the heat raises the temperature so there is a call for cooling and the

37 68-0173—3

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.

CO2 Monitor

When a CO2 monitor is configured and installed, the Comfort Center™ programl turns on ventilation (if configured for ventilation), or

response to a high CO

system fan (if configured for no ventilation), in

monitor reading.

C7089A Outdoor Temperature Sensor

The outdoor temperature sensor is necessary for the Frost control feature to be activated. The Comfort Center™ control system takes the outdoor temperature reading and calculates the dewpoint to help prevent humidity from accumulating on the windows. With the C7089A installed and configured, the user can read the outdoor temperature by pressing the CHECK key. See Fig. 39 for the resistance vs. temperature characteristics for the C7089A Outdoor Temperature Sensor. When a C7089A Outdoor Temperature Sensor is configured and installed and the PC8900A is configured for humidity control in the heating mode, the frost control feature is enabled.

3900

3800

3700

3600

3500

3400

3300

OHM RESISTANCE

3200

3100

3000

2900

2800

-40

-20

(-40)

(-29)0(-18)

RESISTANCE INCREASES 4.84 OHMS PER 1 F CHANGE OR 8.7 OHMS PER 1 C CHANGE.

M6358

(-7)40(5)60(16)

TEMPERATURE

(27)

100 (38)

120 (49)

140 (60)

160 (79)

OUTDOOR TEMPERATURE

-40

-35

-30

-25

-20

-15

-10

F ( C )

100

105

110

115

120

125

130

135

140

145

150

OHMS OF

RESISTANCE

1.7

4.4

7.2

2929 to 2905

2953 to 2929

2978 to 2953

3002 to 2978

3026 to 3002

3050 to 3026

3074 to 3050

3099 to 3074

3123 to 3099

3147 to 3123

3171 to 3147

3195 to 3171

3220 to 3195

3244 to 3220

3268 to 3244

3292 to 3268

3316 to 3292

3341 to 3316

3365 to 3341

3389 to 3365

3413 to 3389

3437 to 3413

3462 to 3437

3486 to 3462

3510 to 3486

3534 to 3510

3558 to 3534

3583 to 3558

3607 to 3582

3631 to 3607

3655 to 3631

3679 to 3655

3703 to 3679

3728 to 3703

3752 to 3728

3776 to 3752

3800 to 3776

3824 to 3800

3849 to 3824

-40.0

-37.2

-34.4

-31.7

-28.9

-26.1

-23.3

-5

-20.6

-17.8

-15.0

-12.2

-9.4

-6.7

-3.9

-1.1

10.0

12.8

15.6

18.3

21.1

23.9

26.7

29.4

32.2

35.0

37.8

40.6

43.3

46.1

48.9

51.7

54.4

57.2

60.0

62.8

65.6

Fig. 39. C7089A Outdoor Temperature Sensor and C7100A Discharge Temperature Sensor

resistance vs. temperature performance characteristics.

C7100A Discharge Air Temperature Sensor

The C7100A Discharge Air Temperature Sensor mounts on the duct wall or plenum surface with integral mounting flange or in a 2 x 4 in. junction box. The C7100A senses the air temperature in the discharge and if the temperature is not acceptable for the heating or cooling setting, the Comfort Center™ control system lights the check LED and presents a

68-0173—3 38

Check message. See Fig. 39 for the resistance vs. temperature characteristics for the 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 for a discharge air temperature but the discharge air temperature is not displayed, then a power outage has cleared the discharge air temperature reading from the Check feature. To re-establish the discharge air temperature, enter the installer

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.

Keypad Lockout

The keypad lockout feature allows temporary settings to be made, but the installer setup and program settings can not be changed. This feature gives the PC8900A the security of a locking cover with flexibility to meet the user’s schedule. To activate keypad lockout, press and hold RUN until LOCK KEY shows on the display (approximately three seconds). To deactivate keypad lockout, press and hold RUN until OPEN KEY shows on the display.

C7189A Remote Indoor Temperature Sensor

The C7189A Wall Mount Temperature Sensor provides the input required by the Comfort Center™ control system to sense the indoor air space temperature. See Fig. 40 for the resistance vs. temperature characteristics for the C7189A Remote Indoor Temperature Sensor.

At a remote location, the C7189A can also average temperature in several ways:

• PC8900A and one C7189A.

• Four or nine C7189As in series/parallel networks.

• PC8900A and a C7189A network (four or nine sensors).

NOTE: The remote temperature (or temperature averaging

network temperature) is displayed on the PC8900A with the Time, Day, and Mode of operation. Pressing the CHECK key does not display the remote temperature separately.

2300

2200

2100

2000

1900

1800

1700

1600

OHM RESISTANCE

1500

1400

1300

1200

1000

40 (4)50(10)60(16)

RESISTANCE DECREASES 18.6 OHMS PER 1 F CHANGE OR 33.4 OHMS PER 1 C CHANGE.

(21)80(27)90(32)

TEMPERATURE

CHECK Key

Press the PC8900A CHECK key to display the following information:

• Outdoor temperature (if C7089A installed).

• Humidity level in room.

• Discharge air temperature (if C7100A installed).

• Heating and cooling setpoints.

• Fan setting.

• Ventilation setting.

• System setting.

If the Check LED is lighted, troubleshooting messages are displayed. Refer to Fig. 41 for flowchart of troubleshooting messages.

100 (38)

F ( C )

ROOM TEMPERATURE

100

10.0

11.1

12.2

13.3

14.4

15.6

16.7

17.8

18.9

20.0

21.1

22.2

23.3

24.4

25.6

26.7

27.8

28.9

30.0

31.1

32.2

33.3

34.4

35.6

36.7

37.8

7.8

8.9

OHMS OF

RESISTANCE

2131 to 2094

2094 to 2057

2057 to 2019

2019 to 1982

1982 to 1945

1945 to 1908

1908 to 1871

1871 to 1833

1833 to 1796

1796 to 1759

1759 to 1722

1722 to 1685

1685 to 1647

1647 to 1610

1610 to 1573

1573 to 1536

1536 to 1499

1499 to 1461

1461 to 1424

1424 to 1387

1387 to 1350

1350 to 1313

1313 to 1275

1275 to 1238

1238 to 1201

1201 to 1164

1164 to 1127

1127 to 1089

M6357

Fig. 40. C7189A Remote Temperature Sensor resistance vs. temperature performance characteristics.

39 68-0173—3

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

COMMUNICATIONS WITH THE HOME SYSTEM AND W8900 CANNOT BE ESTABLISHED.

CONNECTION BETWEEN PC8900 AND W8900 CANNOT BE ESTABLISHED.

DISCHARGE AIR SENSOR IS PRESENT AND INDICATES A COOL SYSTEM FAILURE WHILE IN COOLING MODE.

• CHECK CONNECTIONS BETWEEN HOME SYSTEM AND COMMUNICATION MODULE.

• CHECK COMMUNICATIONS BUS.

• RECONFIGURE PC8900

• RECONFIGURE PC8900.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

WRONG DISCHARGE AIR SENSOR IS INSTALLED.

W8900 CANNOT READ DISCHARGE AIR TEMPERATURE.

PC8900 CONFIGURED FOR DISCHARGE AIR TEMPERATURE SENSOR, BUT NOT INSTALLED.

WRONG DISCHARGE AIR SENSOR IS INSTALLED.

FAN RUN TIME HAS EXCEEDED 720 HOURS.

DISCHARGE AIR SENSOR IS PRESENT AND INDICATES A HEAT SYSTEM FAILURE WHILE IN HEATING MODE.

WRONG DISCHARGE AIR SENSOR IS INSTALLED.

HEAT PUMP COMPRESSOR FAILURE RELAY HAS ENERGIZED W8900 L TERMINAL.

W8900 CANNOT READ OUTDOOR AIR TEMPERATURE.

PC8900 CONFIGURED FOR OUTDOOR TEMPERATURE SENSOR, BUT NOT INSTALLED.

WRONG OUTDOOR TEMPERATURE SENSOR IS INSTALLED.

• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• RECONFIGURE PC8900.

• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

1. CLEAN AIR CLEANER CELLS OR REPLACE AIR FILTER.

2. PRESS CANCEL KEY WHILE VIEWING FILT CHG MESSAGE.

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.

• CHECK HEAT PUMP. REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

• CHECK CONNECTIONS BETWEEN C7089 AND W8900.

• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.

• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS BEING USED.

W8900 CANNOT READ DISCHARGE AIR TEMPERATURE.

PC8900 CONFIGURED FOR DISCHARGE AIR TEMPERATURE SENSOR, BUT NOT INSTALLED.

WRONG DISCHARGE AIR SENSOR IS INSTALLED.

PC8900 HUMIDITY SENSOR IS INOPERATIVE.

PC8900 TEMPERATURE SENSOR HAS FAILED.

IF THE COMM CHK LIGHT IS CAUSED BY HEAVY COMMUNICATION FROM THE CM8900, IT DISAPPEARS IN 5 SECONDS. NO ACTION IS NEEDED.

Fig. 41. Troubleshooting procedures.

68-0173—3 40

• CHECK CONNECTIONS BETWEEN C7100 AND W8900.

• RECONFIGURE PC8900.

• CHECK THAT C7100 AVERAGING DISCHARGE AIR SENSOR IS BEING USED.

• REPLACE PC8900.

• RECONFIGURE PC8900 FOR REMOTE SENSOR USE.

M6193B

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.

PC8900 CONFIGURED FOR OUTDOOR TEMPERATURE SENSOR, BUT NOT INSTALLED.

WRONG OUTDOOR TEMPERATURE SENSOR IS INSTALLED.

W8900 CANNOT READ REMOTE SPACE TEMPERATURE.

PC8900 CONFIGURED FOR REMOTE SENSOR OPERATION, BUT C7189 IS NOT INSTALLED.

WRONG REMOTE SENSOR IS INSTALLED.

• CHECK CONNECTIONS BETWEEN C7089 AND W8900.

• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.

• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS BEING USED.

• CHECK CONNECTIONS BETWEEN C7189 AND W8900.

• RECONFIGURE PC8900.

• CHECK THAT C7189 REMOTE TEMPERATURE SENSOR IS BEING USED.

TEMPERATURE AVERAGING NETWORK IS IN USE, BUT SENSORS ARE NOT CONFIGURED CORRECTLY.

SYSTEM PROBLEM.

LINK BETWEEN PC8900 AND W8900 CANNOT BE ESTABLISHED.

THE PC8900 IS IN THE PROCESS OF COMMUNICATING WITH THE W8900.

SYMPTOM POSSIBLE CAUSE ACTION

NO DISPLAY ON PC8900.

HEATING WILL NOT COME ON.

NO POWER TO PC8900.

NO POWER TO W8900.

PC8900 SYSTEM SETTING IS INCORRECT.

5-MINUTE COMPRESSOR PROTECTION ACTIVATED.

PC8900 INOPERATIVE.

• CHECK WIRING OF SENSORS AND COMPARE TO SENSOR HOOKUP DRAWINGS.

• PRESS CHECK KEY TO VIEW FURTHER MESSAGES ON PC8900 DISPLAY.

• CHECK CONNECTIONS 2-3 ON PC8900.

• NONE. THE "WAIT" WILL DISAPPEAR IN A SHORT TIME.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.

• MAKE SURE PC8900 IS CORRECTLY MOUNTED ON WIRING WALLPLATE.

• MAKE SURE TERMINALS 1 THROUGH 4 ARE PROPERLY CONNECTED BETWEEN PC8900 AND W8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT HEAT SYSTEM POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900, C7189, AND EQUIPMENT.

• CHECK THAT PC8900 IS SET TO HEAT, EM. HT. OR AUTO.

• IN HEAT PUMP APPLICATIONS, THE PC8900 HAS A

5-MINUTE BUILT-IN TIME DELAY (IF ACTIVATED). ALLOW UP

TO FIVE MINUTES AFTER CHANGING THE SETTING BEFORE THE COMPRESSOR STARTS.

• CONDUCT SELF-TEST. SEE CHECKOUT.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

M6193B

INCORRECT WIRING.

HEATING EQUIPMENT IS INOPERATIVE.

HEATING SETPOINT IS TOO LOW.

HEATING SYSTEM IS NOT COMPATIBLE.

ROOM TEMPERATURE AT REMOTE SENSOR LOCATION IS TOO HIGH.

PC8900 CONFIGURED FOR ONLY ONE STAGE OF HEATING.

• SEE WIRING DIAGRAM.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

• ADJUST SETPOINT USING AND KEYS.

• REFER TO WIRING DIAGRAMS. ADD R8222 RELAY, R8339 CONTROL CENTER, OR S566 SWITCH IF REQUIRED.

• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.

• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF HEAT REQUIRED.

Fig. 41. Troubleshooting procedures (Continued).

41 68-0173—3

M18742

SYMPTOM POSSIBLE CAUSE ACTION

TEMPERATURE CHANGES OCCUR AT THE WRONG TIMES.

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.

PRESENT SETTING APPEARS INACCURATE.

HEAT AND COOL SETPOINTS NEED TO BE ADJUSTED REGULARLY.

PC8900 DISPLAY FLASHES DURING OPERATION.

PARTIAL PC8900 DISPLAY.

COOLING WILL NOT COME ON.

ADAPTIVE INTELLIGENT RECOVERY™ IS SELECTED.

AND KEYS BEING USED TO ADJUST TEMPERATURE.

TIME AND DAY HAVE BEEN LOST DUE TO POWER OUTAGE.

INOPERATIVE PC8900.

NO POWER TO W8900.

PC8900 SYSTEM SETTING IS INCORRECT.

5-MINUTE COMPRESSOR PROTECTION ACTIVATED.

• REMEMBER THAT WITH THE HEATING OR COOLING SYSTEM COMES ON BEFORE

THE WAKE AND RETURN START TIMES SO THE HOUSE WILL BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD

STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL RECOVERY. REFER TO INSTALLATION SECTION.

• REMEMBER THAT WITH THE HEATING OR COOLING SYSTEM COMES ON BEFORE

THE WAKE AND RETURN START TIMES SO THE HOUSE WILL BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD

STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL RECOVERY. REFER TO INSTALLATION SECTION.

• REPROGRAM PC8900 TO MAKE PERMANENT CHANGE IN PROGRAM. REFER TO PROGRAMMING INSTRUCTIONS.

• REPROGRAM TIME AND DAY. REFER TO PROGRAMMING INSTRUCTIONS.

• REPLACE PC8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT COOL SYSTEM POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900, C7189, OR EQUIPMENT.

• CHECK THAT PC8900 IS SET TO COOL OR AUTO.

• THE PC8900 HAS A 5-MINUTE BUILT-IN TIME DELAY (IF ACTIVATED). ALLOW UP TO FIVE MINUTES AFTER CHANGING THE SETTING BEFORE THE COMPRESSOR STARTS.

ADAPTIVE INTELLIGENT RECOVERY™

SYSTEM FAN IS RUNNING INDEPENDENT OF HEATING OR COOLING EQUIPMENT.

PC8900 INOPERATIVE.

INCORRECT WIRING.

COOLING EQUIPMENT IS INOPERATIVE.

COOLING SETPOINT IS TOO HIGH.

ROOM TEMPERATURE AT REMOTE SENSOR LOCATION IS TOO LOW.

PC8900 CONFIGURED FOR ONLY ONE STAGE OF COOLING.

PC8900 FAN SETTING IS SET AT FAN CIRC.

PC8900 IS CONFIGURED FOR ELECTRIC HEAT FAN OPERATION.

PC8900 IS CONFIGURED FOR OVERRUN IN COOLING.

• CONDUCT SELF-TEST. SEE CHECKOUT.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

• SEE WIRING DIAGRAM.

• REFER TO MANUFACTURER SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.

• ADJUST SETPOINT USING AND KEYS.

• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.

• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF COOLING.

• CIRCULATING FAN FEATURE ALLOWS FAN TO OPERATE INDEPENDENT OF HEATING OR COOLING EQUIPMENT. REFER TO OPERATION SECTION.

• RECONFIGURE PC8900 FOR NO ELECTRIC HEAT FAN.

• RECONFIGURE PC8900 FOR NO FAN OVERRUN IN COOLING.

Fig. 41. Troubleshooting procedures (Continued).

M18743

68-0173—3 42

SYMPTOM POSSIBLE CAUSE ACTION

HUMIDIFICATION EQUIPMENT WILL NOT COME ON IN HEATING.

PC8900 IS NOT CONFIGURED PROPERLY.

HUMIDITY SETTING IS TO LOW.

• RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN HEATING (APPLIES TO W8900A,B ONLY).

• ADJUST HUMIDITY SETTING USING AND KEYS.

GREEN LED ON W8900 IS NOT OPERATING.

DEHUMIDIFICATION EQUIPMENT (COOLING) WILL NOT COME ON IN COOLING.

VENTILATION EQUIPMENT WILL NOT COME ON.

PC8900 IS CONFIGURED FOR FROST CONTROL.

NO POWER TO HUMIDIFIER.

NO POWER TO W8900.

PC8900 IS NOT CONFIGURED PROPERLY.

HUMIDITY SETTING IS TO HIGH.

EQUIPMENT COMPRESSOR PROTECTION ACTIVATED.

NO POWER TO DEHUMIDIFIER (COOLING) EQUIPMENT.

PC8900 IS NOT CONFIGURED PROPERLY.

NO POWER TO VENTILATION EQUIPMENT.

• TO PREVENT FROST FROM FORMING ON WINDOWS, SOME CALLS FOR HUMIDIFICATION WILL NOT BE ALLOWED. REFER TO INSTALLATION AND OPERATION SECTION.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT EQUIPMENT POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS ON EQUIPMENT, PC8900 AND W8900.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT COOL SYSTEM POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900, C7189, OR EQUIPMENT.

• RECONFIGURE PC8900 FOR HUMIDITY CONTROL IN COOLING (APPLIES TO W8900A,B ONLY).

• ADJUST HUMIDITY SETTING USING AND KEYS.

• EQUIPMENT HAS A MINIMUM-OFF TIME TO PROTECT THE COMPRESSOR (IF ACTIVATED). ALLOW UP TO FIVE MINUTES AFTER CHANGING THE SETTING BEFORE THE COMPRESSOR STARTS.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT EQUIPMENT POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS ON EQUIPMENT PC8900 AND W8900.

• RECONFIGURE PC8900 FOR VNT OR OUTSIDE AIR DAMPER.

• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE OR RESET IF NECESSARY.

• CHECK THAT EQUIPMENT POWER IS ON.

• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900 OR VENTILATION EQUIPMENT.

VENTILATION EQUIPMENT IS RUNNING INDEPENDENT OF PC8900.

TEMPERATURES ARE DISPLAYED IN C.

TIME IS DISPLAYED IN MILITARY TIME (EX: 14:00).

DISCHARGE AIR TEMPERATURE NOT DISPLAYED WHEN CHECK KEY IS PRESSED.

A HIGH CO LIVING SPACE.

A REMOTE SWITCH IS CALLING FOR VENTILATION.

PC8900 IS NOT CONFIGURED PROPERLY.

PC8900 IS NOT CONFIGURED FOR DISCHARGE AIR TEMPERATURE.

POWER OUTAGE HAS REMOVED DISCHARGE AIR TEMPERATURE FROM DISPLAY.

CONDITION EXISTS IN THE

• WHEN CO2 SENSOR SENSES HIGH CO2 CONDITION, SYSTEM

FAN AND VENTILATION ARE ACTIVATED TO VENTILATE LIVING SPACE.

• TURN REMOTE SWITCH OFF.

• RECONFIGURE PC8900 FOR F.

• RECONFIGURE PC8900 FOR 12 HOUR CLOCK.

• RECONFIGURE PC8900 FOR DISCHARGE AIR TEMPERATURE.

• ENTER INSTALLER SET UP MODE FOR A FEW SECONDS. AFTER LEAVING SET UP MODE, DISCHARGE AIR TEMPERATURE IS DISPLAYED UNTIL NEXT POWER OUTAGE.

Fig. 41. Troubleshooting procedures (Continued).

43 68-0173—3

M18744

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.

COMFORT TEMPERATURE

The temperature you want in the morning when you get up (WAKE period) and in the evening when you’re home (RETURN period).

CONVENTIONAL RECOVERY SETTING

The time when the PC8900A starts operating the heating and cooling equipment to reach the set temperature from the energy savings temperature (LEAVE, SLEEP) to the comfort temperature (WAKE, RETURN).

DAILY PROGRAM SCHEDULE

The schedule of WAKE, LEAVE, RETURN and SLEEP period start times, temperatures, fan and ventilation that you program to run for each individual day.

ENERGY-SAVING TEMPERATURE

The lower (heating) or higher (cooling) temperature that lets you save on heating and cooling costs when you’re asleep or away. Also called the setback (winter) or setup (summer) temperature.

OUTDOOR TEMPERATURE

In systems with an outdoor sensor, the temperature reading at the sensor. Reading is available by pressing the CHECK key until the display shows OUT and the temperature.

SELECT PERIOD KEY

Key that starts the program mode. It also lets you choose WAKE, LEAVE, RETURN or SLEEP period to review or program.

PROGRAM

The times, temperatures, fan and ventilation settings you choose to define the comfort periods (WAKE, RETURN) and energy savings periods (LEAVE, SLEEP) for each daily schedule.

SETBACK

Reducing the temperature in the house for a set period every day in winter for energy savings. The lower temperature is the energy savings temperature.

SETUP

Raising the temperature in the house for a set period every day in summer for energy savings. The higher temperature is the energy savings temperature.

SETPOINT

The temperature, humidity or frost setting you program on the PC8900A. The PC8900A turns the appropriate equipment on and off to maintain this setting until another setting goes into effect.

SYSTEM LIGHT (YELLOW)

On the PC8900A, this lights glows when there is a call for heating or cooling.

TIME PERIOD

One of four program periods: WAKE, LEAVE, RETURN and SLEEP available with the PC8900A. One period begins when the previous period ends.

WAKE—The time period when you want the house at a comfortable temperature while the family gets up and gets ready to leave for work and school. LEAVE—The time period when you can set back (winter) or set up (summer) the temperature for energy savings because the family is usually away from home. RETURN—The time period when you want the house at a comfortable temperature for family activities in the evening before bedtime. SLEEP—The time period when you can set back (winter) or set up (summer) the temperature for energy savings because the family is sleeping. Set it to start at your family’s normal bedtime. Often, energy savings are set only in winter so family members can sleep cool in summer.

PREPROGRAMMED SCHEDULE

The schedule programmed into your PC8900A at the factory. It sets a night program that provides energy savings if you don’t set your own program, or if your personal program is lost for any reason. The program, which is the same for all days of the week, is:

Period Start Time

Saturday

WAKE (6:00 AM) (70°F) (78°F) (AUTO) (OFF)

LEAVE (8:00 AM) (62°F) (85°F) (AUTO) (OFF)

RETURN (6:00 PM) (70°F) (78°F) (AUTO) (OFF)

SLEEP (10:00 PM) (62°F) (82°F) (AUTO) (OFF)

Home and Building ControlHome and Building Control Honeywell Asia Pacific Inc.Honeywell Europe S.A.Honeywell Latin American

Honeywell Honeywell Limited-Honeywell Limitée Room 3213-3225 3 Avenue du Bourget Region 1985 Douglas Drive North 35 Dynamic Drive Sun Hung Kai Centre 1140 Brussels 480 Sawgrass Corporate Parkway Golden Valley, MN 55422 Scarborough, Ontario No. 30 Harbour Road Belgium Suite 200

68-0173—3 J.H. Rev. 04-01 www.honeywell.com/yourhome

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Honeywell perfect climate comfort center control system User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

GENERAL

FEATURES

SPECIFICATIONS

INSTALLATION

When Installing this Product…

Mounting the W8900A-C Remote Module

Wiring the W8900A-C to the HVAC Equipment

WIRING DIAGRAMS

W8900A,C Hookup Diagrams

W8900B Hookup Diagrams

W8900A,B,C Humidity Control Hookup Diagrams

Mounting the PC8900A Control Panel

Wiring the PC8900A

In replacement applications, more than four wires can be available. In these applications, tape off the unused wires at the PC8900A location and the W8900A-C location.

Mounting the C7189A Remote Sensor (if needed)

Wiring the C7189A Remote Sensor (if needed)

Mounting the C7089A Outdoor Sensor (if needed)

Wiring the C7089A Outdoor Sensor (if needed)

Mounting the C7100A Discharge Air Sensor (if needed)

Wiring the C7100A Discharge Air Sensor (if needed)

INSTALLER SETUP

PROGRAMMING PC8900A

Setting the Current Day and Time

Setting a Customized Program

Operating the Comfort Center™ Control System

CHECKOUT

OPERATION

Conventional vs. Adaptive Intelligent Recovery™ Operation

Minimum-Off Timing

Fan Control

Humidity Control (W8900A and B)

Ventilation Control

CO2 Monitor

C7089A Outdoor Temperature Sensor

C7100A Discharge Air Temperature Sensor

Keypad Lockout

C7189A Remote Indoor Temperature Sensor

TROUBLESHOOTING

GLOSSARY