Honeywell PC8900A User's Manual
Contents
1. 891 for programming instructions 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 When power is restored the time and day information must be re entered W8900 REMOTE MODULE INSTALLATION To install the W8900 Remote Module refer to form 69 0894 for instructions packed with the remote module Honeywell Home and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario Pumed a Mee on recycled MIV 4Z9 post consumer paper fibers 69 0893 1 J H Rev 5 952. Honeywell 40 PERFECT CLIMATE COMFORT CENTER TRADELINE APPLICATION 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 The PC8900 must be used with a W8900 Remote Module 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 These models will replace most heating cooling system thermostats Check Table 1 to make sure the thermostat is compatible with the intended system Table 1 Compatibility Chart me SS System Type with PC8900 Baseboard Electric See Note b 120 240 Line Volt 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 e e All Rights Reserved PC8900A Control Panel INSTALLATION INSTRUCTIONS SPECIFICATIONS Temperature Setting Range 45 F to 88 F 7 C to 31 C Humidity Setting Range 10 to 80 Operating Relative Humidity 5 to 90 noncondensi
3. ION STRIP INSERTION STRIP 5 16 in 8mm 7 6 in 11mm M7518 Fig 3 Proper Wiring Technique 69 0893 1 PC8900A CONTROL PANEL Ww8900 MHL GLC LG GH GEHNHHHHKHKHSS A 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 A IF SHIELDED CABLE IS REQUIRED GROUND TO GND TERMINAL ON W8900 SED Fig 4 Wiring Diagram for PC8900 to the W8900 Remote Module 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 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 CHECKOUT A WARNING Do nofjumper 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 CALIBRATION The PC8900 is calibrated at the factory and cannot be recalibrated in the field PROGRAMMING See Owner s Guide form 69 0
4. ng Finish White Dimensions in in mm 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 RECYCLING 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 any control containing mercury ina sealed tube If you have any questions call Honeywell Inc at 1 800 468 1502 Monday through Friday 7 AM to 5 30 PM Central time 69 0893 1 PC8900A CONTROL PANEL INSTALLATION When Installing this Product 1 Read these instructions carefully Failure to follow instructions can damage the product or cause a hazardous condition Check the ratings on the product and the compatibil ity in Table 1 to make sure the product is suitable for your application Installer must be a trained experienced service technician After completing installation use these instructions to check out product operation N CAUTION Disconnect power supply before wiring to prevent electrical shock or equipment damage Location and Mounting NOTE The following location guidelines apply only if a remote sensor is not part of the installation If a remote sensor is ins
5. rature 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 PC8900A CONTROL PANEL 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 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 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 STS FOR STRAIGHT FOR WRAPAROUND INSERT
6. s on top of the wiring plate Device will function properly even when not level Mark three mounting holes using a pencil Remove wiring plate from wall and drill 3 16 inch holes in wall if drywall as marked For firmer material such as plaster or wood drill 7 32 inch holes Gently tap anchors provided into drilled holes until flush with the wall See Fig 2 Position wiring plate over holes in wall or outlet box pulling wires through wiring opening Loosely insert two mounting screws into holes Tighten mounting screws Fig 1 Typical Location of PC8900 69 0893 1 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 NOTE WIRES THROUGH WALL WALL ANCHORS 3 MOUNTING HOLES 4 9 NNC ountine SCREWS 3 ZA USE THREE MOUNTING HOLES THAT BEST FIT APPLICATION aioe 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 IMPORTANT Erratic tempe
7. talled the PC8900 can be installed in any convenient location with these guidelines applying to the sensor location Locate the PC8900 where it will not be subjected to tampering y Choose a location on an inside wall about 5 ft 1 5m above the floor A horizontally mounted standard 2 in x 4 in 51 mm x 102 mm outlet box can also be used at the selected location for the PC8900 Be sure that the wire distance between the PC8900 and the W8900 does not exceed 200 feet No 5 FEET 1 5 METERS oo Be sure that there is good air circulation at average temperature at the chosen location Avoid the following locations because they can introduce errors in temperature measurements e Hot areas caused by e Concealed pipes or ducts Drafts from fireplaces or other heat sources e Convection or radiant heat from the sun or electrical equipment e Cold areas caused by e Concealed pipes or ducts e Drafts from windows and doors e Unheated areas on the other side of the wall location e Dead air areas Behind doors furniture and curtains e In corners and alcoves Mark the area on the wall where the PC8900 or outlet box will be mounted Run cable to a hole at the selected wall location Pull approximately 3 inches of wire through the opening Color coded 18 gauge thermostat wire is recommended Position wiring plate on wall Level the wiring plate for appearance only using the post
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