Honeywell Q539 User's Manual
Contents
1. Honeywell Q539A H and J Subbases Installation Instruction for the Trained Service Technician Application Q539 Subbases provide cooling anticipators and mounting for T87F Thermostats Q539 Subbases also provide system and fan switching for heating cooling and heating cooling thermostats For subbase specifications refer to Tables 1 and 2 TABLE 1 SUBBASE SPECIFICATIONS System Fan See Model Description Switch Switch Terminals Fig 3 Q539A provides system and fan switching and cooling HEAT anticipator for heating cooling systems Includes indicator OFF LOCKOUT LED for use in oil burner systems fan switch to control fan in AUTO position COOL AUTO ON RH RC W Y G X Q539H provides fan switching with Z terminal for low voltage AUTO ON R W Y G X Z 5 Q539J provides system switching for control of heating and cooling for heat pump and electric heating Auto fan operates through fan relay on both heating and cooling TABLE 2 TERMINAL DESIGNATIONS Heating Damper Motor or Changeover Valve if used Cooling Damper Motor or Changeover Valve if used G Fan Relay Coil Clogged Filter Switch or Lockout Switch primary control Heat Pump Contactor Coil Z Q539H low voltage fan switch for control of fan relay in AUTO position for both heating and cooling control Cooling transformer in systems with separate heating and cooling circuits Heating transformer in systems with isolated he2. ION If outside air or heat exchange medium water is below 10 C 50 F do not operate cooling Move the system switch on the Q539 to COOL and the fan switch to AUTO Move the cooling setpoint dial to about 6 C 10 F below room temperature Cooling equipment should start and the fan should run Change the setpoint to about 6 C 10 F above the room temperature The cooling equipment and fan should shut off FAN Move the subbase switch to OFF and the fan switch to ON The fan should run continuously Move the fan switch to AUTO In this position fan operation is controlled by the heating or cooling system control circuit Operate the entire system one complete cycle with switches in each position before leaving installation Turn thermostat dial to the desired setting and set the system and fan switches Honeywell Automation and Control Solutions Honeywell 1985 Douglas Drive North Golden Valley MN 55422 35 Dynamic Drive Scarborough Ontario MIV 4Z9 Honeywell Limited Honeywell Limit e Printed in U S A on recycled paper containing at least 10 95 6486 9 G H Rev 8 02 post consumer paper fibers www honeywell com yourhome
3. ating and cooling circuits Circuit only completed between R and B with system switch in HEAT position Circuit only completed between R and O with system switch in COOL position Only available on subbases with indicator LEDs Ri RH W Y B G X U S Registered Trademark D Copyright 2002 Honeywell All Rights Reserved ca b c e AUTO ON R W Y G X P O B This control contains mercury in a sealed tube Do not place control in the trash at the end of its useful life If this control is replacing a control that contains mer cury 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 Mercury Notice Installation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow instructions can damage product or cause a hazardous condition 2 Check ratings given in instructions and on product to make sure product is suitable for your application 3 Make sure installer is a trained experienced service technician 4 After completing installation check out product opera tion as provided in these instructions LOCATION Locate the subbase about 5 ft 1 5m above the floor in an area with good air circulation at average temperature 95 6486 9 Do not mount the subbase where it may
4. be affected by drafts or dead spots behind doors or in corners hot or cold air from ducts radiant heat from the sun fireplaces or appliances concealed pipes and chimneys unheated uncooled areas such as an outside wall I CAUTION e Disconnect power supply to prevent electri cal shock or equipment damage e Do not short across coil terminals on relay this can burn out the thermostat heat anticipator e Do not overtighten captive mounting screws because damage to subbase threads can result MOUNTING AND WIRING Disconnect power supply before beginning installation to prevent electrical shock or equipment damage All wiring must comply with local codes and ordinances 1 In replacement applications check the existing sub base wires for cracked or frayed insulation Replace any wires in poor condition If the wire is plastered into the wall make a hole next to the wires and loosen the wires so that the wires can be pushed back into the wall later 2 In new installations run wiring if necessary to the subbase location IMPORTANT To prevent interference with the thermostat linkage keep wire length to a minimum and run wires as close as possible to the subbase 3 Connect the wires to the terminals inside the subbase Refer to equipment manufacturer instructions for Q539 wiring diagrams If not available refer to Fig 1 through 5 4 Push excess wire back through the hole and plug any o
5. bed below SYSTEM SWITCH some subbases do not have all of the following functions COOL cooling system is automatically controlled by the thermostat Heating system is off OFF both the heating and cooling systems are off If the fan switch is at AUTO position the cooling fan is also off HEAT heating system is automatically controlled by the thermostat Cooling system is off FAN SWITCH ON fan operates continuously AUTO fan operates with cooling equipment as con trolled by the thermostat or with the heating equip ment as controlled by the plenum switch To move the subbase switches to the desired control positions use thumb and index finger to slide lever Stop lever must stop over desired function indicator position for proper circuit operation Fig 4 Typical hookup for Q539H in heating cooling application with remote switching required to select heating or cooling and to provide automatic fan operation Q539H T87F INTERNAL SCHEMATIC FILTER 1 LIGHT j 1 Remote N HESTI 1 SYSTEM gt switch f lt COOL CLOGGED FILTER SWITCH COOLING CONTACTOR COIL OR COOLING PANEL CONNECTION HEATING EXTERNAL SWITCHING FOR AUTO FAN X TERMINAL IS USED ON Q539 MODELS WITH FACTORY INSTALLED MALFUNCTION LIGHT A POWER SUPPLY PROVIDE DISCONNECT L2 L MEANS AND OVERLOAD PROTECTION AS REQUIRED HOT M8833 Fig 5 Typical hookup for Q539J in heating cool
6. ing applications Fan relay operates automatically on heat or cool with fan in AUTO position Q539J T87F INTERNAL SCHEMATIC HEATING DAMPER MOTOR COOLING DAMPER MOTOR X TERMINAL IS USED ON Q539 MODELS WITH FACTORY INSTALLED MALFUNCTION LIGHT A WITH NO O TERMONAL LOAD THERMOSTAT CURRENT DURING HEATING CYCLE VARIES DEPENDING ON WHETHER FAN SWITCH IS IN THE ON OR AUTO POSITION HEATER SHOULD BE SET FOR COMBINED CURRENT LEVEL OF HEAT RELAY AND FAN RELAY COILS WITH O TERMINAL LOAD SET THERMOSTAT HEAT ANTICIPATOR TO ITS MAXIMUM SETTING LIMIT THE THERMOSTAT HEATING LOAD CURRENT TO 0 8 AMPS TO ASSURE GOOD PERFORMANCE A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M8834 Checkout When installation is complete turn on power supply and check system operation HEATING Move the system switch on the Q539 to HEAT and the fan switch to AUTO Move the heating setpoint dial to about 6 C 10 F above room temperature Heating equipment should start and the fan should run Change the setpoint to about 6 C 10 F below the room temperature The heating equipment and fan should shut off NOTE In heat pump applications a minimum off timer provides a five minute time delay before starting com pressor when the thermostat last turned off the compres sor or when the system first received power This delay prevents compressor short cycling 95 6486 9 COOLING AN CAUT
7. pening with insulation to prevent drafts that can affect performance 5 Loosely fasten the thermostat subbase to the wall with ascrew through the left mounting hole Adjust the subbase so it is approximately level and start the second screw through the right mounting slot Do not tighten 6 Level the thermostat subbase using a spirit level as shown in Fig 1 7 Tighten mounting screws IMPORTANT An incorrectly leveled subbase will cause the temperature control to deviate from setpoint 8 Mount and wire the thermostat to the thermostat sub base using the equipment manufacturer s instructions 95 6486 9 Fig 1 Level Q539 using a spirit level SPIRIT LEVEL LEVELING POSTS 2 THERMOSTAT MOUNTING WIRING SLOTS M3319A Fig 2 Barrier configuration FOR STRAIGHT INSERTION FOR WRAPAROUND STRIP 5 16 in 8 mm STRIP 7 16 in 11 mm ee sia eee SUBBASE TERMINAL SCREW M8831 Fig 3 Typical hookup for Q539A in heating cooling application with remote lockout indication Q539A T87F INTERNAL SCHEMATIC FIXED COOL ANTICIPATOR AUTO oN HEAT OFF cooL O Lockout HEAT INDICATOR KY HEATING CONTROL La HEATING COOLING P TRANSFORMER TRANSFORMER iam L2 L wou HOT HOT POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M8832 Settings SUBBASE SETTING The subbase switching positions control the system operation as descri
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