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IR CONTROL BOXPlenum TerminalDesignationConventional WireConnectionFunction Of Low Voltage Terminal ExtendingFrom Ceiling PlenumR RedProvides 12 VDC to upper unit control boxB-BlueProvides -12 VDC to upper unit control boxFreeze (2 terminals)WhiteFreeze sensor attaches hereCommTelco CableCommunication line between upper unit control box and receiver assemblyWWhiteEnable the gas heating applianceWRWhite/RedEnable the gas heating appliance****Option of using a two wire gas heating appliance and the normally open relay contacts betweenWR and W if the 12 VDC tab is removedCONTROL BOX KITS1.8330-752 12 VDC Controlled, Cool Only3.This kit consists of a control box assembly. The evaporatorfreeze sensor is shipped in an envelope for installation byquick connects to terminal strip “Freeze”.This kit is similar to the 8330-752 with the exception of atransformer that is attached to the box assembly.4.2.8530-750 24 VAC Controlled, Cool Only9330A755 12 VDC Controlled, Heat/CoolThis kit consists of a control box assembly. The evaporatorfreeze sensor is shipped in an envelope for installation byquick connects to terminal strip “Freeze”. A heater assemblyis also packed with the kit.9530A755 12 VDC Controlled, Heat PumpWith Backup Electric HeatThis kit is similar to the 9330A755 but is wired for the heatpump function.5.9530A751 12 VDC Controlled, Heat PumpThis kit is the same as the 9530A755 except without the electricheater assembly.CONTROL BOX KITS (ZONE)1.8330B751 - 12 VDC Zone Controlled, Cool Onlyenvelope for installation by quick connects to terminal stripmarked “FREEZE”.This kit consists of a control box assembly. The evaporatorfreeze sensor is shipped in an envelope for installation byquick connects to terminal strip marked “FREEZE”.2.3.8530C751 - 12 VDC Zone Controlled, Heat PumpThis kit consists of a control box assembly. The evaporatorfreeze sensor is shipped in an envelope for installation byquick connects to terminal strip marked “FREEZE”. Backupelectric heat is available as an optional kit (part number9233-4551).8330C755 - 12 VD Zone Controlled, Heat/CoolThis kit consists of a control box assembly and a heaterassembly. The evaporator freeze sensor is shipped in an5

CONTROL BOX KITS (INFRARED REMOTE)1.9330-752 - 12 VDC IR Controlled, Cool Onlysmall parts package is to be installed by quick connects to theterminals marked “FREEZE”. The electric heater assembly isavailable as a kit (part number 9233-4551).This kit consists of a control box assembly, receiver assembly,grille insulation, handheld transmitter, small parts package andan operation manual. The evaporator freeze sensor in thesmall parts package is to be installed by quick connects to theterminals marked “FREEZE”.2.3.9530-757 - 12 VDC IR Controlled, Heat PumpThis kit consists of a control box assembly, receiver assembly,grille insulation, handheld transmitter, small parts package andan operation manual. The evaporator freeze sensor in thesmall parts package is to be installed by quick connects to theterminals marked “FREEZE”. Backup electric heater assemblyis available as an optional kit (part number 9233-4551).9330-757 - 12 VDC IR Controlled, Heat/CoolThis kit consists of a control box assembly, receiver assembly,grille insulation, handheld transmitter, small parts package andan operation manual. The evaporator freeze sensor in theWALL THERMOSTATS1.Locate and install the thermostat per instructionsfound with the thermostat.2.For 12 VDC thermostats, it is required that thethermostat 12 volt negative connection be routeddirectly from the converter or battery. It is highlydesirable to provide 12 volt control power from thebattery side of the converter. These precautionsshould prevent control problems.3.subject to vibration, the electromechanical thermostatmust not be used as electromechanical contacts will“chatter” the compressor relay if used in highvibration applications. For applications subject tovibration, an electronic wall thermostat must be used.RV Products part numbers are 8330-3241 or7330A3441.4.For the 24 VAC thermostat, keep in mind that if theapplication will involve operation while in motion orThe sub-base used with heat/cool and heat pumpthermostats replaces the mount plate provided withthe thermostat. The thermostat body snaps onto thesub-base.SUPPLY DUCTING AND REGISTERSA.Ducting1.The field fabricated supply ducting must attach toboth sides of the ceiling plenum. A minimum of twoducts are required, with one duct attached to eachside of the plenum (See Figure 1).2.Ten (10) square inches of free area per duct is theminimum requirement, larger ducting will improve airflow and system performance.Each duct must have a minimum height of 1 ½",maximum height cannot exceed 4 inches. Total freearea inside each duct must be no less than 10 squareinches.3.Where ducting secures to the ceiling plenum,maximum width is 8 inches.4.All field fabricated cold air supply ducting must beinsulated and must have a vapor barrier.IMPORTANTNOTEInsulation reduces cooling loss and helpsprevent water staining of the vehicle ceilingdue to moisture condensation.To decrease restriction and increase air flow,the ducting should make as few bends andturns as possible. When corners or turns arerequired, we recommend that you radius thecorners to keep air flow at a maximum.B.RegistersSupply (cold air) registers should have a minimumdischarge area of 48 square inches per system, or 24 squareinches per duct. A minimum of 6 is recommended.6

ROUTING THERMOSTAT WIRING1.Following the instructions packed with thethermostat, determine a location for thermostatmounting.C.2.Following RV Products low voltage wiringspecifications and all local and national electricalcodes:(4) Four wires are required (5 wires forheat/cool boxes). These wires are asfollows:A.(1)(1)(1)(1)(1)Route the thermostat 12 VDC supply wiringfrom the power source to the thermostatmounting location.Two wires are required:One supply lead must be 12 VDC and red incolor.The second supply lead must be -12 VDCand blue in color.B.3.To protect the wall mount thermostat fromover-current damage, a 2 amp fuse has beenprovided with the thermostat.Route the thermostat control wiring from thethermostat mounting location into the frontof the ceiling plenum opening.Blue wire for -12 VDC circuitYellow wire for compressor circuitGreen wire for high fan circuitGray wire for low fan circuitWhite wire for heat circuitRV Products low voltage wiring specifications:A.All low voltage wiring should be 18 gaugeminimum.B.Low voltage wiring must be routed into thefront side of the ceiling plenum opening.ROUTING THERMOSTAT WIRING (ZONE)1.2.Following the instructions packed with thethermostat, determine a location for thermostatmounting.B.Following RV Products low voltage wiringspecifications and all local and national electricalcodes:A.3.Route the thermostat control wiring from thethermostat mounting location into the frontof the ceiling plenum opening.See Figure 5 for wiring requirements formultiple zones.RV Products low voltage wiring specifications:A.All low voltage wiring should be no smallerthan 18 gauge.B.Low voltage wiring must be routed into thefront side of the ceiling plenum opening.C.Low voltage wiring should not be routedwith high voltage wiring.D.If low voltage and high voltage wires mustcross, they should do so at right angles fromone another.These wires are as follows:(1)(1)(1)(1)(2)(1)(2)(2)Red wire to 12 VDC circuit (R )Blue wire for -12 VDC circuit (B-)Purple wire to communicationsignal (Sig)Any color for auto generator start(optional) (Gen)Any color for room temperaturesensor (zone 1 optional, requiredfor other zones)For each heating appliance(Up to 4)Any color for cool load shed(optional)Any color for heat load shed(optional)7

ROUTING IR WIRING1.Following RV Products low voltage wiringspecifications and all local and national electricalcodes:A.Route the 12 VDC supply wiring from thepower source to the control box mountinglocation in the front of the ceiling plenumopening. Two wires are required:(1)(1)B.2.RV Products low voltage wiring specifications:A.All low voltage wiring should be no smallerthan 18 gauge.B.Low voltage wiring must be routed into thefront side of the ceiling plenum opening.C.Low voltage wiring should not be routedwith high voltage wiring.D.If low voltage and high voltage wires mustcross, they should do so at right angles fromone another.E.Insure that wires cannot contact screws orsharp edges in the wire race ways.F.If stapling the wire bundle during therouting process, be careful not to pierce thewire insulation.Red wire to 12 VDC circuit (R )Blue wire for -12 VDC circuit (B-)Route the control wiring from the gasheating appliance to the control boxmounting location in the front of the ceilingplenum opening. This is not required for theunits that do not have a gas heatingappliance.Single wire gas heat appliance has a 12VDC signal and only one wire is required:(1)White wire for the gas heatingappliance (W)Two wire gas heat appliance will use theN.O. contacts of the heat relay if the 12 Vtab is removed. Two wires are required:(1)(1)White wire for the gas heatingappliance (W)White/Red wire for the gas heatingappliance (WR)ROUTING 115 VAC WIRINGFollowing RV Products high voltage wiring specifications andall local and national electrical codes, route the roof top unit115 VAC supply wiring from its power source and into thefront of the roof top opening. Allow approximately 12" of thewiring into the opening.2.To prevent voltage drops greater than 10% duringstarting, adhere to the following guideline:For lengths greater than 50', use #10 AWG.Circuit Protection - Refer to upper unit nameplate.High Voltage Wiring Specifications1.U.L. approval requires the power supply to be copperconductors only with minimum #12 AWG.8

FIGURE 1CEILING PLENUM MOUNTINGA.Installing Unit (Refer to Figure 1)B.Installing Divider Board (Refer to Figure 1)1.Place the air conditioner over the roof opening.1.2.Position the mount frame into the ceiling opening(See Figure 1).Measure the distance between the ceiling and theupper unit basepan, add ½" to this measurement andcut the duct divider to this height if necessary.ALWAYS CUT OFF THE BOTTOM EDGE (THEEDGE WITHOUT FOAM STRIP).3.Using the four bolts provided, secure the mountframe to the roof top unit. The four mounting boltsare to be applied up through the bottom of the mountframe and into the bottom of the roof top unit (SeeFigure 1). Tighten each bolt until the indicators ofthe gasket are at roof level.2.Carefully wedge this divider between the walls of theroof opening and up against the upper unit basepanwith the silver side facing forward.3.Align the divider support plate under the ductdivider. Attach to mount frame with four shortscrews found in the small parts package (See Figure1).4.Route the conduit into the return opening.9

INSTALLING THE CONTROL BOX1.Remove the control box assembly cover which is heldby two sheet metal screws. Feed the field lead wiresand ground through the strain relief found with thecontrol box.2.Attach black supply conductor to black “pigtail”lead, white to white, and ground to green with wirenuts provided in control box kit.3.Insure that no bare wires can come into contact withlive electrical parts and that wires cannot be pinchedbetween the control box sides and lid. Insert thestrain relief into the control box entry hole to securethe field wiring. Reinstall the control box lid.4.Attach the thermostat wires to the control box perillustrations below:A.B.C.Control Box 8530-7505.Connect the roof unit 115 volt electrical conduit tothe wirebox 9 pin receptacle and verify that the plugsare properly aligned and have snapped togethersecurely.6.Locate the two machine screws inside the evaporatorcover of the upper unit. Align the control box overthe screws and use the wing nuts supplied with thecontrol box to secure it to the upper unit enclosure.7.Insert the evaporator freeze sensor betweenevaporator fins near the bottom center of theevaporator and between the bottom two tubes (SeeFigure 2). Insert straight in until contacting thestaggered tube directly in back of the insertion point.When contact has been made, elevate the exposedend of the sensor approximately 45 degrees, thencontinue insertion at a 45 degree angle until thesensor is completely embedded into the evaporator.Control Box 8330-752Control Box 9330A755, 9530A751 & 9530A755FIGURE 210

INSTALLING THE CONTROL BOX (ZONE)All control boxes install by one of two methods.1.2.Remove the control box assembly’s cover which isheld by two sheet metal screws.Set the “zone” jumper to the proper zone position forthe particular position the air conditioner or heatpump will be in the coach (Refer to Figure 3- Zone 1is shown). Zones should be numbered from the frontof the back of the coach with Zone 1 in front.3.Set the “HP”/”NON HP” jumper to “HP” if the unit isa heat pump or to “NON HP” if the unit is not a heatpump (Refer to Figure 3- Non HP is shown).4.Feed the field lead wires and ground through thestrain relief found with the control box then throughthe 7/8" hole in the side of the box.5.Wire nut the black 12-gauge field power conductor tothe stripped black 12-gauge wire in the control box.6.Wire nut the white 12-gauge field power conductor tothe stripped white 12-gauge wire in the control box.7.Wire nut the ground field power conductor to thestripped green ground wire in the control box.8.Insure that no bare wires can come into contact withlive electrical parts and that wire cannot be pinchedbetween the control box sides and lid. Insert thestrain relief into the control box entry hole to securethe field wiring. Reinstall the control box lid.9.Mount control box in upper unit return aircompartment.Attach the thermostat wires to Zone 1 control box per theillustration below (Refer to Figure 4):FIGURE 3FIGURE 411

Note: The Zone System isshown with the maximumheating and coolingappliance connections.FIGURE 512

Zone 2 is wired in by jumpering from SIG, B- and R on Zone 1box to Zone 2 box. Zone 3 is wired in by jumpering from SIG,B- and R on Zone 2 box to Zone 3 box. Zone 4 is wired in byjumpering from SIG, B- and R on Zone 3 box to Zone 4 box(See Figure 5).Complying with the warnings listed below, connect the 115VAC supply wiring to its power source. Be sure all powerremains off until beginning checkout procedure.DANGERConnect the roof unit 115 volt electrical conduit to the wirebox9 pin receptacle and verify that the plugs are properly alignedand have snapped together securely.TO PREVENT THE POSSIBILITY OFSHOCK INJURY FROM APPLIANCEOPERATION:The control box will be mounted by first removing the rubberwel-nuts (if supplied with the control box) and discarding thewing bolts. Position the control box over the screws and usethe rubber wel-nuts (or wing nuts if supplied) to fasten thecontrol box to the upper unit enclosure.THE WHITE WIRE MUST BECONNECTED TO NEUTRAL IN THESERVICE BOX ENTRANCE AND THEMECHANICAL GROUND MUST BECONNECTED TO A GROUNDINGLUG IN THE SERVICE BOX OR THEMOTOR GENERATOR COMPARTMENT.Insert the evaporator freeze sensor between evaporator finsnear the bottom center of the evaporator and between thebottom two tubes (See Figure 2). Insert straight in untilcontacting the staggered tube directly in back of the insertionpoint. When contact has been made, elevate the exposed endof the sensor approximately 45 degrees, then continueinsertion at a 45 degree angle until the sensor is completelyembedded into the evaporator.INSTALLING THE CONTROL BOX (IR)1.Remove the control box assembly’s cover.2.Optional to remove the “FURNACE” tab if no gasheating appliance is to be used. This will disable anyfuture use of a gas heating appliance.3.Remove the “ 12V” tab if a two wire gas heatingappliance is to be used.4.Insert the strain relief into the 7/8" entry hole in theside of the control box. Feed the field wires andground through the strain relief.5.Wire nut the black 12-gauge field power conductor tothe stripped black 12-gauge wire in the control box.6.Wire nut the white 12-gauge field power conductor tothe stripped white 12-gauge wire in the control box.7.Wire nut the ground field power conductor to thestripped green ground wire in the control box.8.Insure that no bare wires can come into contact withlive electrical parts and that wires cannot be pinchedbetween the control box sides and lid. Secure thefield wiring in the strain relief. Reinstall the controlbox lid.FIGURE 613

9.Attach the low voltage control wires to the controlbox per the illustration below:FIGURE 7Note:Receiver patch cord will be connected to the receiverassembly when the air grille assembly is installed.9.Connect the roof unit 115 volt electrical conduit tothe wirebox 9 pin receptacle and verify that the plugsare properly aligned and have snapped togethersecurely.10.11.12.Complying with the warnings listed below, connectthe 115 VAC supply wiring to its power source. Besure all power remains off until beginning thecheckout procedure.DANGERTO PREVENT THE POSSIBILITY OF SHOCK INJURYFROM APPLIANCE OPERATION:Locate the two machine screws inside the evaporatorcover of the upper unit. Align the control box overthe screws and use the wing nuts supplied with thecontrol box to secure it to the upper unit enclosure.THE WHITE WIRE MUST BE CONNECTED TO NEUTRALIN THE SERVICE BOX ENTRANCE AND THEMECHANICAL GROUND MUST BE CONNECTED TO AGROUNDING LUG IN THE SERVICE BOX OR THE MOTORGENERATOR COMPARTMENT.Insert the evaporator freeze sensor between theevaporator fins near the bottom center of theevaporator and between the bottom two tubes (SeeFigure 2). Insert straight in until contacting thestaggered tube directly in back of the insertion point.When contact has been made, elevate the exposedend of the sensor approximately 45 degrees, thencontinue insertion at a 45 degree angle until thesensor is completely embedded into the evaporator.Then connect the sensor to the two terminals marked“FREEZE”.14

INSTALLING THE HEATER ASSEMBLY1.The heater assembly found with the 9330A755,9530A755 or 8330B755 control box kits can now beinstalled. The backup electric heater assembly isoptional for control box kits 8530B751, 9330-757,9530A751 or 9530-757. The backup electric heaterassembly is available as a kit (part number9233-4551).2.Position the heater assembly into the return airopening as shown in Figure 9. Insure that the setscrew is retracted sufficiently to allow installationover the basepan extrusion.3.The heater bracket must be installed between thebasepan and the plastic drain pan. See Figure 8.4.Tighten set screw to secure the assembly so as toprevent movement.5.Insert the two-pin connector of the heater umbilicalinto the receptacle on the control box. Insure that theconnector snap-locks into position.TIE ALL WIRING TO INSURE NO CONTACT WITH THEHEATER OR ANY SHARP EDGES. KEEP IN MIND THATHIGH VELOCITY AIR WILL BE ENCOUNTERED IN THISAREA.FIGURE 8FIGURE 9INSTALL AIR GRILLE ASSEMBLY1.2.Temporarily remove the air grille assembly filter door.A quarter-turn of the fastener will disengage thedoor. Attach the air grille frame to the mount framewith 3 screws as shown in Figure 1 - use 3/4" screws.Adjust as desired to insure that all foam parts arewithin the grille perimeter, and secure the corners ofthe grille to the ceiling. These 4 corner screwsare not provided. Check all fits to insure that areasonably air tight seal exists to separate unit supplyair from unit return air.screws and washers provided in the smallparts package of the control kit.If an IR CONTROL KIT is used, the receiver assemblywill need to be installed.3.A.Remove the filter and locate the receiverassembly

between the 12 VDC power supply and the control box "R " ( 12 VDC) to protect the control wiring. A. A low voltage terminal strip on the front of the box connects to the low voltage control wires. The wires attach by 1/4" quick connects. B. The low voltage power wiring must be run from the power source to the wire box low voltage terminals.