Bryant 907 User's Manual
Contents
1. Installation of the Model 907 consists of the following steps sections I Locating the Unit II Connecting the Air Ducts II Making Electrical Connections IV Start up and Adjustment In addition the following sections are also included V Maintenance VI Recommended Service Procedures IMPORTANT Read Before Installing 1 Check local codes and ordinances for additional requirements pertaining to installation of unit 2 Check electrical power supply to building to be sure rated voltage frequency and phase correspond to that on unit rating plate ee pa SUPPLY AIR IA PLENUM COOLING i COIL uy GAS SUPPLY UPFLOW FURNACE ELECTRONIC AIR CLEANER RETURN R PLATFORM A68176 Figure 4 Typical Upflow Furnace Installation TRANSITION TO ACCOMMODATE FRONT SECTION OF EAC a BEEN VENT RETURN AIR GRILLE x DOWNFLOW ELECTRONIC l FURNACE AIR CLEANER y DISCONNECT 120 V SUPPLY Sea Lalal fE LLL i COMBUSTIBLE FLOOR BASE A SUPPLY AIR domeenpen femme A68178 Figure 6 Typical Downflow Furnace Installation o 3 Because Model 907 cleans only air brought to it by system blower run blower continuously or as much as possible summer and winter 4 Do not block air outlets and returns with draperies or furniture COOLING COIL 3 TO TRANSITION DUCT WORK ALTERNATE AIR CLEANER POSITION ELECTRONIC AIR CLEANER2. UPFLOW FURNACE A68177 Figure 5 Typical Basement Furnace Installation ELECTRONIC AIR CLEANER HORIZONTAL FURNACE SERVICE PLATFORM Zig Zee FA SUPPLY AIR PLENUM RETURN AIR PLENUM A68179 Figure 7 Typical Horizontal Furnace Installation 12 16 24 907 LOCATING THE UNIT Figures 4 5 6 and 7 show the air cleaner in the return air duct of some typical furnace installations with and without air conditioning Other methods of installing the unit are permissible if the design procedure outlined in the Product Data Sheet is observed When planning an installation consider the following 1 The air cleaner is approved only for indoor installa tion If an outdoor installation is used the unit must be housed in a weatherproof enclosure 2 Theair cleaner may be placed on its right or left side in a vertical or horizontal position It must be in stalled on the inlet air side of the heating and or cooling unit Be sure that the airflow through the air cleaner is in the same direction as the airflow arrow indicates 3 Allow a minimum of 30 inches clearance in front of the unit for cleaning and maintenance 4 The air cleaner should never be used to collect grease or other flammable contaminants 5 If a humidifier is used moisture should be intro duced downstream from the air cleaner il CONNECTING THE AIR DUCTS Dispose of existing mechanical furnace filters They are not required Move ON
3. Internal Detail 12 16 24 907 To replace the media pads 1 Slide collector section Figure 11 from unit and place it yellow side down on a piece of paper should be more than twice as large as collector laid out ona flat surface 2 Deflect spring clips downward lift wire grill and pivot it upward enough to remove dirty media pad Place soiled pad to one side 3 Place clean pad on perforated center plate of collector frame Pad should completely cover center plate and insulators 4 Pivot wire grill downward and deflect spring clips until grill is engaged 5 Turn collector section over and repeat steps 2 3 and 4 to change other media pad NOTE For best results do not clean and reuse dirty media pads They can however be reused tem porarily by vacuuming or shaking out accumulated dust Pads can be vacuumed through the wire grill Use brush attachment of cleaner 6 Slide collector section on its track completely into casing 7 Roll up dirty pads and paper and dispose of them The ionizer assembly should be cleaned at the start of each heating and cooling season by using the long brush attachment of a vacuum cleaner manually by using a soft long bristled brush by wiping the plates with a damp cloth or by a combination of these three methods Care must be taken not to break the ionizer wires or bend the ionizer plates After cleaning and reassembly of components rein stall the power
4. TABLE I DIMENSIONS TABLE II PHYSICAL DATA 12 907 600 16 907 24 907 E 1200 Air Volume Range CFM 1400 2400 i 800 1600 Filter Area Face area N 2 o To I OX 10 fe olg 2 x ti N in E N ai x lt a T c ft Nominal size 120 volts AC single phase 60 Hertz 7200 volts DC 1 7 Milliamps gt Electrical Data Input to power door Output to unit Approx Shipping Weight TABLE lil_PRESSURE DROP AT VARIOUS AIRFLOWS 16 907 12 907 Pressure Drop inches wc Pressure Drop Inches wc CFM oa O o as e gjs 3 e 2 Oo 0 ba a LL O 1400 20 duct systems designed for airflows lower than 907 and 1400 CFM for 24 907 is not recommended Note Using the electronic air cleaner on air 600 CFM for Model 12 907 800 CFM for 16 z2 12 16 24 907 blower operating 120 VAC 10 single phase 60 Hz current is applied to the power pack trans former The output of the transformer secondary is approximately 3600 VAC and alternately charges two capacitors through two silicon rectifiers The total charge across both capacitors results ina power pack output of approximately 7200 VDC therefore the cir cuit is classed as a voltage doubler circuit NOTE Power packs are completely encapsulated and not field repairable The surge resistor is ex ternal to the power pack and can be readily replaced in the field
5. Installation Instructions ELECTR ONIC AIR CLEANER INTRO DUCTION The Boi Model 907 Series A Electronic Air Cleaner is available in three sizes 12 907 1200 CFM 16 907 1600 CFM and 24 907 2400 CFM They are designed for use with residential and light commercial forced air heating and or cooling systems and can be installed in a vertical or horizontal sec tion of a typical return air duct system The electronic components of the unit convert the 120 VAC of the power supply to 7200 VDC which imparts an electrical charge to airborne particles such as smoke bacteria pollen and dust These charged par ticles are then attracted by the dust couechne media thus purifying the airstream The electronic air cleaner consists of 1A cabinet containing the air cleaning assembly 2 A power door assembly See Figure 2 CABINET A casing encloses three sections Ghat make up the air cleaning assembly These sections are e 1 Mechanical prefilter An expanded metal first stage filter that removes lint and larger dust particles 2 Ionizer section Consists of ihesen wires that receive a positive charge mounted between grounded steel channels and supported by polyester glass reinforced insulators 3 Collector section Consists of two pecduded wire grills and one center plate that receives a positive charge with two fiber glass dirt collecting media pads one on either side of the center plate See Fig
6. OFF switch to OFF and unlock the power door by rotating the knob approxl mately 10 turns counter clockwise until the door is free Grasp the power door by the knob and the door handle and remove it from the cleaner casing by pulling it towards you This motion disengages the 120 V power supply connector Remove and discard the cardboard packing taped to the inside surface of the door See Figure 8 Slide out all three sections See Figure 9 Note there are no 12 16 24 907 standing flanges on the air cleaner casing This per mits a greater range of application If flanges are needed L shaped standing seam duct cleats can be used for connecting the ductwork or to position the furnace on top of the air cleaner All downstream connections must be properly sealed to prevent in filtration of unfiltered air Airflow across the air cleaner must be uniform for best results Turning vanes should be installed if the air cleaner is installed close to an elbow Depending Figure 8 Power Door Packing A70013 LINE VOLTAGE DISCONNECT PREFILTER COLLECTOR IONIZER es cee Pee TNT i POWER DOOR tao A70008 Figure 9 Power Door Removed from Air Cleaner R72 ee on the size of the furnace it may or may not be necessary to reduce the ductwork on th leaving air side of the air cleaner Whatever the application a 3 to 1 duct reduction ratio should be maintained 3 inches of duct l
7. OUCH SCREWDRIVER TO CASING grn HOLD BLADE APPROX 7 FROM BUS BAR A70010 Figure 13 Checking High Voltage DC Supply 12 16 24 907 2 Energize encapsulated power pack and measure voltage across light leads Reading must be 90 to 130 VDC 3 If voltage is within tolerance indicator light is defective Replace E CHECK ENCAPSULATED POWER PACK See Figure 10 If the voltage supplied by the power pack to the indicator light is less than 60 90 VDC when the high voltage wire is disconnected from the bus bar and the power pack is energized 1 Power pack has defective circuit 2 Check terminal on surge resistor for high voltage output of power pack Voltage must read 7500 9000 VDC with surge resistor disconnected from bus bar With air cleaner components energized operating voltage is approximately 7200 VDC If meter is not available for a voltage measurement ground blade of an insulated handle screwdriver against grounded base plate and move blade tip towards surge resistor terminal See Figure 13 A spark should occur at a gap of 1 8 to 3 16 inch between terminal and screwdriver tip indicating potential of approximately 8000 VDC 3 Encapsulated power pack is defective Replace F CHECK SURGE RESISTOR De energize the power pack and check the surge resistor in place on the power pack See Figure 10 The measurement should be 15 000 ohms 30 watts Replace if shorted or open A shorted resistor does not pr
8. ble if unable to straighten replace ionizer section E Broken insulators in either ionizer or collector section Replace ionizer or collector section F Dents in one or both collector section wire grills Straighten if possible if not replace grill G Improperly positioned media pad Reposition H Supply voltage exceeding 132 VAC Change power pack supply lead to low tap I Vibration from external source Eliminate vibration source or isolate air cleaner PUSH BUS BAR FORWARD WITH SCREWDRIVER INSULATOR IONIZER BUS BAR CHANNEL FIT WIRE INTO SLOT A70012 Figure 14 Replacing lonizer Wire 4 AIR NOT BEING CLEANED Be sure indicator light is glowing showing proper electrical operation Check for A No power to ionizer and collector sections Check for proper contact between bus bar on power door and T handles on ionizer and collector sections B Airflow through unit set too high Use velometer to adjust to no more than 350 ft min C Leaks in ductwork blower box and other parts of system under negative pressure on clean air side of air cleaner Seal leaks with duct tape or caulking D Dirty air not being delivered to the cleaner as result of blocked return air grills Remove drapes furniture or any other obstruction E Uneven air distribution across face of unit Install turning vanes or air baffles to even air distribution An even collection of dirt across entering sid
9. door Make sure that door is securely locked Move power switch to ON Unit is now ready for operation VI RECOMMENDED SERVICE PROCEDURES Tools required for servicing Jumper cord l wire 12 16 24 907 WIRE GRILL GRILL RETAINER CLIP FIBER GLASS PAD INSULATORS A70119 Figure 11 Collector Section Components Jumper cord 3 wire Voltmeter capable of measuring up to 10 000 VDC Screwdriver slotted head Pliers long nose 1 MALFUNCTIONS THAT PREVENT INDICATOR LIGHT OPERATION A glowing indicator light indicates that the power pack is energized and that the proper DC voltage is being supplied to the air cleaner If the light is off make the following checks A CHECK PRIMARY VOLTAGE If the primary voltage does not read between 108 and 132 VAC at the outlet receptacle female plug on the casing cen terpost check the 120 VAC power source If the voltage reading at the centerpost receptacle is within the 120 VAC 10 range check further to isolate the problem to 1 Power door 2 Indicator light na B CHECK CABINET ASSEMBLY 1 Make sure all components are correctly assembled as shown in Figure 2 2 Turn ON OFF switch to OFF 3 Remove power door 4 Install 3 wire jumper cord from male line voltage disconnect plug on power door to female plug on casing centerpost See Figure 12 5 Move ON OFF switch to ON a If indicator light does not glow proceed to check high voltag
10. e of a media pad indicates good distribution 5 RADIO OR TV INTERFERENCE Check for A Improper grounding Ascertain that power pack has good electrical ground B Supply line voltage ground line not properly grounded Correct l b C Loose ionizer wires Replace D Foreign particles lodged in ionizer section Remove E Loose connections on components or primary wiring within power door Tighten connections F Defective power pack Replace G Dents in one or more grills or center plate Straighten or replace H Damaged media pad Replace I Improperly installed pad Reposition 6 WHITE DUST White dust may be noticed on furnishings especially when the cleaner first begins to function It is especially noticeable on dark furniture White dust is largely composed of lint which because of its weight settles before it reaches the air returns The amount of lint generated is increased by new fur nishings or draperies and the activity of children and pets Large clean lint particles have no staining or soiling properties SEQUENCE OF OPERATION When system blower is in operation power pack 1B is energized with 120 V 10 single phase 60 Hz AC current 12 16 24 907 The enclosed power pack transformer secondary out pack output of approximately 7000 7500 VDC put of approximately 3600 VAC alternately charges Current from the enclosed power pack flows through two capacitors through two s
11. e output indicator light and encapsulated power pack b If indicator light glows check out ionizer and collector sections for possible short Move switch OFF clip jumper between bus bar on base plate and T handle on section testing Push switch ON If indicator light glows when section is energized separately section is good If light does not glow sec tion is shorting out If either section is defective refer to Step 6a and 6b that follow for corrective action procedures If both collector and ionizer pass their checkouts look for trouble in the power door Be sure to push switch OFF and remove jumper cord before proceeding to check filter sections and power door 6a Check out ionizer section for 1 Excessive dirt on ionizer wires or ionizer chan nels Clean with vacuum cleaner brush If necessary use cloth dampened in detergent and water solution Dry thoroughly before reassembly 2 Bowed or dented ionizer channels Make sure channels are approximately parallel Wires should be spaced at least 3 8 inch from channels Straighten channels if necessary 3 Broken or loose ionizer wires Replace wires using long nosed pliers as shown in Figure 14 Place terminal on one end of wire in notch in ionizer bus bar Grasp terminal on other end of wire with pliers and pull wire firmly Depress ionizer bus bar with screwdriver until you can fit wire into notch on bus bar position terminal on bus bar then remove scr
12. ength for every 1 inch reduction in size NOTE Do not baffle off any portion of the entering air side of the cleaner When changes in duct size would be too abrupt an alternate horizontal position may be used as illustrated in Figure 5 For best results use multiple return air grills located at or near floor level Higher cleaning efficiencies and lower blower operating costs are obtained by limiting the filter face velocity to 350 ft min lll MAKING ELECTRICAL CONNECTIONS 1 With power door removed remove junction box cover located above female plug on casing center channel 2 Air cleaner casing has a top line voltage entrance hole Use hole install strain relief to run two wire with ground electric cable into position for making connections at female plug 3 Connect power leads to black and white pigtails extending from female plug using wire nuts provided 4 Connect ground to green pigtail extending from female plug box using wire nut provided ie ce junction box cover 5 Slide prefilter ionizer and collector sections into casing 6 Replace power door by first inserting bottom tab into place on bottom edge of door opening Push top of door and guide lock knob screw Figure 10 into threads Turn knob clockwise until screw engages threads in casing Continue turning knob clockwise until door is securely locked 7 Use proper wiring diagram for single or multiple speed blowers If cleaner is
13. ewdriver pressure on bus bar A70011 Figure 12 Checking Indicator Light 4 Broken cracked or loose insulator or in sulators Replace complete ionizer section 5 Broken spotwelds between ionizer channels and center ground strap Refasten strap to channel with pop rivet or sheet metal screw 6b Check out collector section for 1 Dirty media pads Clean or replace Reassem ble collector section Indicator light should now glow if dirty pads were problem source 2 Bent grills or perforated center plate Straighten 3 Broken cracked or loose insulator or in sulators Replace collector section 12 16 24 907 C CHECK HIGH VOLTAGE OUTPUT If the ON OFF light still will not glow and it has been deter mined that the trouble is not in the cabinet assembly proceed to check the high voltage output as follows 1 PERONE base plate from power door 2 Disconnect surge resistor from terminal on base plate See Figure 10 3 Install 3 wire jumper cord from male line voltage disconnect plug on casing centerpost See Figure 12 4 Push ON OFF switch ON If light glows trouble is isolated to high voltage terminal surge resistor broken or damaged bus bar insulators D CHECK INDICATOR LIGHT If the indicator light still does not glow when the high voltage wire is disconnected from the bus bar on the base plate check the voltage supplied to the light as follows 1 Disconnect light leads at light T
14. ilicon rectifiers The the surge resistor 11A and energizes the ionizer sec total charge across both capacitors results in a power tion 4F1 and collector section 4F2 A TIA LEGEND 4B Power Pack 4F1 lonizer 4F2 Collector 11A Surge Resistor _ EQUIPMENT GR 41D Earth or Water Ground 4F 11E Chassis Ground 11D 11F Indicator Light NE NE HWE a 7 a Gr A72327 Figure 15 Line to Line Wiring Diagram L2 EL De AIR COMMON L HUMIDIFIER CLEANER O O oF BLUE _ a P BLACK Cc i m o bie LOW HIGH bane aa ELECTRONIC AIR CLEANER HUMIDIFIER y YELLOW O WHITE A i a w kk c kk E LOW VOLTAGE TERMINAL STRIP BRYANT MODEL 850 COMFORT PROGRAMMER NON BRYANT COMMON SIDE OF TRANSFORMER K h k k TERMINAL FOR HEATING SIDE OF THERMOSTAT A629400 e TERMINAL FOR COOLING SIDE OF THERMOSTAT Figure 17 Wiring Diagram of Model 850 Comfort Programmer Used to Control Model 907 19 48 94 QN7 10 LOW VOLTAGE TO FURNACE TERMINALS W x E ON SOME UNITS X amp F MAY BE COMMON FIELD LOW VOLTAGE WIRING FIELD HIGH VOLTAGE RELAY P N 63653D CURRENT DRAW 0 1 AMP MANUAL DISCONNECT FIELD INSTALLED Bor SUPPLY NOTE THE SPST RELAY AMPERAGE DRAW MUST BE ADDED TO THE THERMOSTAT ANTICIPATOR SETTING HIGH LOW NOTE FOR COMBINATION HEATING COOLING INSTALLATIONS HAVING MULTI SPEED DIRECT DRIVE MOTORS USE THE
15. l ELECTRONIC AIR CLEANER MODEL 850 COMFORT PROGRAMMER A70107 Figure 16 Wiring Diagram for Model 907 Connected to Heating Only Furnace No Humidifier HUMIDIFIER AIR CLEANER J lizov Je OPTIONAL AiR LINE VOLTAGE DELETE THIS WIRE CLEANER HUMIDISTAT IF HUMIDISTAT IS USED HERMOSTAT COOLING RELAY COND UNIT OR F R CHILLER O TERM BLK LUO Te ans TO W WIRE FROM THERMOSTAT A692320 TO TRANSFORMER TERMINAL COMMON WITH GAS VALVE X TO G WIRE FROM THERMOSTAT Figure 18 Wiring Diagram for Comfort System Control Center 120 V System for Heating and Cooling Two Transformers 112 12 16 24 907
16. operly protect the power pack An open resistor means that the high voltage cord and air cleaner components are not receiving high voltage power G CHECK FOR HIGH HUMIDITY SHORTING During periods of high over 80 percent relative humidity there exists a possibility that the two nor mally nonconductive media pads can absorb enough moisture to support conduction between the high positive potential center plate of the collector section and the two grounded grills The result is excessive current draw and the collapse of transformer voltage The indicator light goes out Continuing operation of the blower in the system should dry out the pads to stop center plate to grill conduction The high voltage will be restored and the indicator light will glow again Humidifiers when used should be installed down stream from the air cleaner to avoid the possibility of high humidity shorting 2 HUMMING NOISE Check for the following A Improper wiring connections B Loose ionizer wires Repair or replace C Excessively dirty ionizer or collector section in cluding media pads Clean i 3 CONSTANT OR INTERMITTENT ARCING Check for A Loose or defective ionizer wire or wires Repair or replace B Excessively dirty ionizer or collector section in cluding media pads Clean C Foreign matter such as string lodged in or close to lonizer section and flapping in airstream Remove D Bent ionizer channels Straighten if possi
17. ure 11 POWER DOOR ASSEMBLY See Figure 10 The door assembly consists of 1 A power indicator light er switch and lock knob installed on the door cover 2 A door base plate contains an encapsulated power pack a surge resistor and wiring that are mounted internally A line voltage disconnect male plug and high voltage spring bus bar is mounted on the base plate externally Six screws must be removed to ex pose the power pack and wiring Power Pack The supply circuit to the power pack which is wired across the system air blower is con trolled by an ON OFF power switch With the power switch ON assuming power door locked and air 907 Sizes 12 16 24 Series B 39907D7 Cancels 39907D6 f 8 15 72 A70009 odel 907 Electronic Air Cleaner REMOVE z fiean A 4 A Pa tM NARESE RENNET GROUNDED PLATEN REPLACEABLE COLLECTING PAD A POSITIVELY poA Roep GRINS ACEABLE A COL TEQHING PAD GROUNDEO PLATE S IONI ZERNS PREFILTER Ba CLEAN AIR f i 120 VOLT POWER SUPPLY 7200 VDC TO IONIZER amp POSITIVE GRID D SAN DUST LADEN RETURN AIR GROUNDED lt casep POWER PACK A68175 Figure 2 Air Cleaner Components a y aq Eg at SO uJ ug 8 ENTRANCE ua INDICATOR 09 0 AY REMOVABLE 0 Gs A70003 igure 3 Dimensional Drawing F
18. wired to a multi speed direct drive motor it must be isolated by a relay IV START UP AND ADJUSTMENT 1 Move switch on power door to ON 2 Set thermostat to start blower 3 Check to see if amber indicator light is glowing This indicates proper unit operation 4 Adjust airflow to no more than 350 ft min This can be done with velometer or as described in filter flag instruction optional V MAINTENANCE Because normal maintenance cleaning is so simple most homeowners will choose to paren perform the necessary operations Clean the unit where dust from the media pads will not soil carpets or the floor To gain access to the prefilter ionizer and collector filter stages simply push power switch to OFF position and remove the power door as outlined previously Lay it off to one side Pull out the first stage prefilter and vacuum from entering air side or wash in detergent and water Let dry thoroughly Re install Do not spray prefilter with any filter coatings Collector pads should be replaced every 3 months or whenever indicated by the optional filter flag or monitor panel This time interval of course will vary with service conditions ENCAPSULATED POWER P PACK ON OFF 120 SWITCH SURGE RESISTOR SUPPLY VOLTAGE w f PLUG 120 VAC TO PRIMARY WINDING BASE PLATE LOCK KNOB SCREW INDICATOR INDICATOR LIGHT COVER SOCKET LIGHT WIRES A70120 Figure 10 Power Door
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