Honeywell PC8900A User Manual

PC8900A  
Control Panel  
®
TRADELINE  
INSTALLATION INSTRUCTIONS  
APPLICATION  
SPECIFICATIONS  
The PC8900 Control Panel provides 24 Vac energy saving  
control for a heating and cooling system, while providing  
reliable, precise temperature control, ventilation control,  
humidity control, programmable fan control and air filter/  
cleaner status information.  
Temperature Setting Range:  
45°F to 88°F (7°C to 31°C).  
Humidity Setting Range:  
10% to 80%.  
The PC8900 must be used with a W8900 Remote Module.  
Operating Relative Humidity:  
5% to 90%, noncondensing.  
The PC8900 includes a SYSTEM light, which is lit when  
the heating or cooling system is running, and a CHECK  
light, which lights as a prompt to check messages on the  
CHECK list.  
Finish:  
White  
Dimensions in in. (mm):  
These models will replace most heating/cooling system  
thermostats. Check Table 1 to make sure the thermostat is  
compatible with the intended system.  
6-3/8 (163) width x 4 (102) height x 1-5/8 (41) depth.  
Accessories:  
205224A Wall Cover Plate to cover marks left on the  
wall by the old thermostat.  
C7189A Wall Mount Indoor Air Temperature Sensor.  
C7089A Outdoor Sensor.  
Table 1. Compatibility Chart.  
Compatible  
System Type  
with PC8900  
GasStanding Pilot  
GasElectronic Ignition  
Gas-Fired Boilers  
GasMillivolt  
Yes  
RECYCLING NOTICE  
M3375  
Yes  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Yes  
See Note a  
Yes  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of any control containing mercury in a  
sealed tube.  
Oil-Fired Boilers  
Oil-Fired Furnace  
Electric Furnace  
Yes  
Yes  
Electric Air Conditioning  
Yes  
If you have any questions, call Honeywell Inc. at  
1-800-468-1502, Monday through Friday, 7 AM to  
5:30 PM, Central time.  
Baseboard Electric  
(120/240 Line Volt)  
See Note b  
Heat Pumps/Multistage Equipment  
Yes  
a
Use R8222N Relay if installing as part of millivolt  
system (see W8900 Remote Module Instructions form  
69-0894).  
b
Use R8222D Relay if installing as part of a 120/240 Vac  
baseboard electric system (see W8900 Remote Module  
Instructions, form 69-0894).  
U.S. Registered Trademark  
Copyright © 1995 Honeywell Inc. •  
All Rights Reserved  
69-0893-1  
PC8900A CONTROL PANEL  
NOTE: If the old thermostat has left marks on the wall  
that are not covered by the PC8900, order part  
no. 205224A Wall Cover Plate to mount between  
the wall and the PC8900.  
CAUTION  
Disconnect power supply before connecting wiring  
to prevent electrical shock or equipment damage.  
All wiring must comply with applicable electrical codes,  
ordinances, and regulations.  
WALL  
1. Loosen the terminal screws and insert one wire  
beneath each numbered terminal (1,2,3,4). Note the  
color of wire that is attached to each terminal  
number to later match the colors with the terminals  
on the W8900 Remote Module. See Fig. 3 and 4 for  
technique and wiring diagram. Four wires are  
required at the thermostat to assure operation.  
2. Securely tighten screw terminals.  
WIRES  
THROUGH WALL  
WALL  
ANCHORS  
(3)  
1
3. Push excess wire back into the hole. Plug the hole  
with nonhardening caulk, putty or insulation to  
prevent drafts from affecting PC8900 operation.  
IMPORTANT  
In replacement applications, more than four wires  
may be available. In these applications, tape off  
the unused wires at the PC8900 location and  
W8900 location.  
MOUNTING  
HOLES (4)  
1
MOUNTING  
SCREWS (3)  
1
USE THREE MOUNTING HOLES THAT BEST  
FIT APPLICATION  
M4466  
Fig. 2. Mounting PC8900 Wiring Plate.  
WIRING  
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 when rerouting is not  
possible. Ground the shielded cable to the GND  
terminal on the W8900.  
FOR STRAIGHT  
INSERTION STRIP  
5/16 in. (8mm).  
FOR WRAPAROUND  
INSERTION STRIP  
7/16 in. (11mm).  
M7518  
IMPORTANT  
Fig. 3. Proper Wiring Technique.  
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 when rerouting of wiring is  
not possible.  
a. Do not route thermostat wiring with building  
power wiring, next to control contactors or  
near light dimming circuits, electric motors or  
welding equipment.  
b. Avoid poor wiring connections.  
c. Avoid intermittent or missing building earth  
ground.  
3
69-08931  
PC8900A CONTROL PANEL  
W8900  
Mounting the PC8900 on the Wiring Plate  
To mount the PC8900 on the wiring plate, engage the tabs  
on the wiring plate with the back of the PC8900 and then  
press the PC8900 to latch.  
OPERATION  
1
2
The PC8900 is not a typical thermostat. It senses tempera-  
ture and humidity conditions in the living space and  
transfers the information to the W8900 Remote Module.  
The W8900 activates the proper equipment based on  
room conditions and programmed settings.  
1
3
2
4
GND  
CHECKOUT  
WARNING  
Do not jumper any PC8900 wires in an attempt to  
activate equipment.  
See checkout procedures included with W8900 Remote  
Module.  
To test for 24V at the PC8900, measure between termi-  
nals 1 and 4.  
3
CALIBRATION  
The PC8900 is calibrated at the factory and cannot be  
recalibrated in the field.  
PROGRAMMING  
2
1
See Owners Guide, form 69-0891, for programming  
instructions.  
1
2
3
4
1
2
POWER OUTAGES  
The PC8900 requires no backup batteries. In event of  
power outage, the time of day and day are retained for  
approximately six hours. Program times, temperatures,  
and settings will be held indefinitely.  
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.  
3
IF SHIELDED CABLE IS REQUIRED, GROUND TO GND  
TERMINAL ON W8900.  
M7519  
NOTE: When power is restored, the time and day  
information must be re-entered.  
Fig. 4. Wiring Diagram for PC8900 to  
the W8900 Remote Module.  
W8900 REMOTE MODULE  
INSTALLATION  
To install the W8900 Remote Module, refer to form  
69-0894 for instructions packed with the remote module.  
Home and Building Control  
Honeywell Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
69-08931 J.H. Rev. 5-95  

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