ASTON LOW SILL SERIES

Transcription

1 ASTON LOW SILL SEIES OMMEIAL Water Source/eothermal Heat Pump -410A efrigerant ommercial Ton Installation Information Water Piping onnections Hot Water onnections Electrical Aston Low Sill Series Installation ti Manual Startup Procedures Troubleshooting Preventive Maintenance IM /18

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3 Table of ontents Model Nomenclature eneral Installation Information Dimensional Data Physical Data Installation Steps System leaning and Flushing Open Loop round Water Systems Electrical onnections Electrical Data Blower Performance Data Wiring Schematics ontrols Unit Startup Notes Unit Startup hecklist/unit Startup Steps Operating Parameters Operating Limits Pressure Drop ompressor and Thermistor esistance efrigerant ircuit uideline Heat of Extraction/ejection Data eference alculations and Legend Startup/Troubleshooting Form Preventive Maintenance eplacement Procedures evision uide

4 Model Nomenclature L S 09 L N N B SS 18 * Model Type L Aston Series Low Sill onsole abinet onfiguration hassis s Only W hassis s with abinet S hassis s with Slope Top Unit apacity 09, 12, 15, 18 Piping Option L Left ight Voltage /60/10/60/ /60/17/60/ /60/11 (09 & 12 Only) Unit ontrol 1 M A Aurora TM Base ontrol (AB) Vintage * - Factory Use Only Non-Standard Options SS Standard Air oil/insulation Option 5 AlumiSeal TM /Extended ange 6 AlumiSeal TM /Standard ange 7 No oating/extended ange 8 No oating/standard ange Sound Kit A None B Blanket Future Option N None Future Option N None oax Option opper N upronickel Thermostat ontrol 1 Unit Mounted Thermostat 2 emote Wall-Mount Thermostat NOTES: hassis only available with left piping option. All Aston Series product is Safety listed under UL1995 thru ETL and performance listed with AHI in accordance with standard

5 eneral Installation Information Safety onsiderations WANIN: Before performing service or maintenance operations on a system, turn off main power switches to the indoor unit. If applicable, turn off the accessory heater power switch. Electrical shock could cause personal injury. Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair or service heating and air conditioning equipment. Untrained personnel can perform the basic maintenance functions of cleaning coils and cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on heating and air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for brazing operations and have a fire extinguisher available. Moving and Storage Move units in the normal up orientation. Do not stack units. When the equipment is received, all items should be carefully checked against the bill of lading to be sure all crates and cartons have been received. Examine units for shipping damage, removing the units from the packaging if necessary. Units in question should also be internally inspected. If any damage is noted, the carrier should make the proper notation on the delivery receipt, acknowledging the damage. Water Piping The proper water flow must be provided to each unit whenever the unit operates. To assure proper flow, use pressure/temperature ports to determine the flow rate. These ports should be located at the supply and return water connections on the unit. The proper flow rate cannot be accurately set without measuring the water pressure drop through the refrigerant-to-water heat exchanger. All source water connections on commercial units are fittings that accept a male pipe thread (MPT). Insert the connectors by hand, then tighten the fitting with a wrench to provide a leakproof joint. When connecting to an open loop (groundwater) system, thread any copper MPT fitting into the connector and tighten in the same manner as described above. efrigerant Systems To maintain sealed circuit integrity, do not install service gauges unless unit operation appears abnormal. ompare the change in temperature on the air side as well as the water side to the Unit Operating Parameters tables. If the unit s performance is not within the ranges listed, and the airflow and water flow are known to be correct, gauges should then be installed and superheat and subcooling numbers calculated. If superheat and subcooling are outside recommended ranges, an adjustment to the refrigerant charge may be necessary. 5

6 Dimensional Data - Flat Top abinet LW09-18 ight Hand abinet Left Hand abinet TOP F D E A B FONT ight return cabinet shown in dimensional views SIDE Overall abinet rille Flat Top onfiguration A B D E F Width Depth Height rille Lid rille Length rille Width in cm in cm

7 Dimensional Data - Slope Top abinet LS09-18 ight Hand abinet Left Hand abinet TOP F D E 80 A B H FONT ight return cabinet shown in dimensional views SIDE Overall abinet rille Slope Top onfiguration A B D E F H Width Depth Height rille Lid rille Length rille Width in cm in cm

8 Dimensional Data - hassis L AI FLOW WATE OUT 1/2" FPT 37.8 WATE IN 1/2" FPT BLOWE AESS PANEL OMPESSO AESS PANEL ONDENSATE DAIN ONNETION FILTE L AI FLOW WATE OUT 1/2 in. FPT WATE IN 1/2 in. FPT

9 Dimensional Data - ontrols Detail: Flat Top hassis Left eturn ight eturn Wall Mount For hassis w/flat Top abinets Handy Box Blower Option Switch ontrol Panel (emove For Access To ontrol Box) ontrol Panel (emove For Access To ontrol Box) Blower Option Switch Wall Mount For hassis w/flat Top abinets Optional Fused/ Non-fused Disconnect Handy Box Optional Fused/ Non-fused Disconnect Optional Ball Valves Optional Hose Kits Air Filter Air Filter Optional Ball Valves Optional Hose Kits Dimensional Data - ontrols Detail: Slope Top hassis ontrol Panel (emove For Access To ontrol Box) Blower Option Switch (On Side Panel) Blower Option Switch (On Side Panel) ontrol Panel (emove For Access To ontrol Box) Wall Mount Attached to Unit Wall Mount Attached to Unit Optional Fused/ Non-fused Disconnect Optional Fused/ Non-fused Disconnect Air Filter Air Filter Optional Hose Kits Optional Ball Valves Handy Box Handy Box Optional Ball Valves Optional Hose Kits 9

10 Physical Data onsole Model ompressor (1 each) otary Factory harge 410A, oz [kg] 27 [0.77] 27 [0.77] 36 [1.02] 34 [0.96] Blower Motor & Blower Blower Motor Type/Speeds EM 3 Speeds Blower Motor - hp [W] EM 0.25 [186] 0.25 [186] 0.25 [186] 0.25 [186] Blower Wheel Size (Dia x W), in. [mm] EM 5.75 x x x x 6.5 [146 x 140] [146 x 140] [152 x 165] [152 x 165] oax and Water Piping Water onnection Size - FPT - in [mm] 1/2 [12.7] 1/2 [12.7] 1/2 [12.7] 1/2 [12.7] oax & Piping Water Volume - gal [l] 0.15 [0.6] 0.18 [0.7] 0.15 [0.6] 0.18 [0.7] Air oil 8 x 22 8 x 22 [203 Air oil Dimensions (H x W), in. [mm] [203 x 559] x 559] 8 x 30 [203 x 762] 8 x 30 [203 x 762] Air oil Total Face Area, ft2 [m2] 1.2 [0.114] 1.2 [0.114] 1.7 [0.16] 1.7 [0.16] Air oil Tube Size, in [mm] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] Air oil Number of rows Filter Standard - Throwaway, in [mm] 23 x x 9.6 [ x 9.6 [ x 9.6 [813 [584 x 244] x 244] x 244] x 244] Weight - Packaged, lb [kg] 200 [91] 205 [93] 215 [98] 220 [100] 5/24/

11 Installation Steps Step 1: Unpack Equipment and Inspect for Damage Step 2: Determine Equipment Location hoose level flooring surface (orrectable with shims. Do not pitch towards drain.) Location of wall support and fasteners required to secure chassis backplate. Easy access for both installation and service. onsider availability and ease of wiring, water piping and condensate drain. No obstructions to block airflow in front of the unit. Step 3: Mark Unit Position Ensure that floor is level. If shims are required, make sure that the entire compressor compartment area is uniformly shimmed and that the backplate mounting height is increased by the thickness of the shims used. Position backplate in desired equipment location. To further reduce the operating sound level of the unit, 1/8-inch thick rubber matting may be placed under the chassis to eliminate vibration on hard flooring surfaces. (Make sure back plate is level). Mark and cut floor or wall penetrations for electrical wiring, water and condensate piping. Optional Electrical Disconnect and Motorized Outside Air Damper Mark and cut wall penetrations for field fabricated outside air duct sleeve. Align mounting holes with backplate and attach with screws supplied. Figure 1 Wall Mount for hassis w/flat Top abinets 19.0 entered w/ abinet Fused Electrical Disconnect (Optional) Wall Penetration for Water onnection Floor Penetration for Water onnection Water Out P/T Plugs (Optional) Water In Ball Valves (Optional) Optional Hoses ondensate Drain Location Low Sill hassis Low Sill Flat Top abinet 11

12 Installation Steps cont. Step 4: Provide Water and ondensate Drain onnections A two-pipe reverse return piping configuration is recommended as it equalizes the piping circuit lengths and delivers even water flow to each unit. A direct return piping configuration may be used, but it may be difficult to achieve and maintain proper water flow to the units. An air vent must be installed in the water distribution system. The supply and return water piping should be run through the wall or floor penetration and terminate with a ball valve. The piping material used must comply with all local codes. efer to: System leaning and Flushing procedures. Pipe Locations Figure 2 Water onnections onsole abinet onsole hassis Fused Electrical Disconnect (Optional Wall Mounted) 24V Accessory Target Area for Wall Penetration 5 in. x 8 in. Area Approx. 1/2 in. from Edge of hassis 3 in. from Floor abinet Extends to this Point 5 in. x 8 in. Area Approx. 1/2 in. from Edge of hassis 1 in. from Front Edge of abinet Electrical Junction Box ondensate Drain Location Target Area for Floor Penetration 12

13 Installation Steps cont. Step 5: Provide Line Voltage Wiring heck unit data plate located on control side of chassis for ampacity and fuse size. emove electrical knockouts from chassis backplate. un line voltage wiring through knockout and secure wiring to backplate or disconnect. Step 6: hassis Installation Level and secure backplate to wall. Position the chassis against back plate. Drive (2) screws through holes in lip of backplate into top flange of chassis. Step 7: Final Electrical onnection Install flexible electrical conduit between the backplate or electrical disconnect and the unit mounted junction box. Make final wiring connections in disconnect and junction box, taking care to replace all covers when done. Wiring must conform to NE and/or all local codes. efer to Electrical Data. NOTE: It is necessary to make final wiring connections prior to securing unit chassis to back plate on right-hand piping models with electrical disconnect. Step 8: Final Water onnection For ease of installation and sound attenuation, high pressure (recommended) flexible hoses with a swivel fitting should be provided. Apply Teflon tape or sealant compound to threaded hose fittings. ombination shut-off/balancing valves should be installed on both the supply and return water lines of the unit. Flow control valves should be installed on the water discharge line. It is recommended that P/T ports be installed on the supply and return water lines. Step 9: Set Unit ontrols Locate the continuous fan/cycle fan switch within the electrical compartment of the chassis and set to desired position. (emote wall thermostat units do not use this optional switch.) Optional ontrol Settings- emote Thermostat - un low voltage wiring from unit to the desired thermostat location. Mount and wire thermostat according to manufacturer s recommendations. Step 10: Secure the abinet over Position and lower cabinet over unit chassis. Apply pressure to the front of the cabinet to ensure that the back lip of the cabinet hooks over the tabs provided on the backplate. Secure cabinet to chassis with mounting screws provided. Step 11: Perform Final Unit heck Measure the pressure drop across the water coil and monitor water or air temperatures in both heating and cooling modes. The measured values should fall within the acceptable ranges shown in the Startup Performance table. 13

14 Installation Steps cont. Field onverting onsole hassis is normally configured with controls on right end and piping on left end (see Figure 3 top view). In this position panel number 1 would be positioned against wall or back plate. Unit may also be turned 180 against wall or back plate. In this position controls will be on left end and piping on right end panel number 2 would be positioned against wall or back plate. hassis must be enclosed with an approved cabinet enclosure. 1. emove 4 screws from front kick panel on cabinet. 2. emove cabinet from chassis by lifting and sliding cabinet straight up. 3. emove grille assembly from cabinet by removing 4 screws from brackets located on the bottom of the grille and door assemblies. 4. eplace grille/door assemblies into cabinet repositioning pieces 1, 2, and 3 into the locations directly opposite the original positions. Secure by replacing mounting brackets. (Note: Be sure that louvers on the grille assembly are facing the proper direction when replacing the grille section.) 5. eplace grille/frame assembly into cabinet, and secure by replacing mounting brackets. 6. eplace cabinet by sliding it down over the top of the chassis. 7. emove tab on leg that extends into return air opening. When the grille side of the cabinet is flat against chassis there will be 4 holes that line up in the leg section. Only use 1 hole for alignment for opposite side of grille. (Note: The tab can be removed by twisting back and forth until it breaks off.) 8. emove plastic strip from tab and replace on rough edge that the tab was removed from. 9. eplace screws in font kick panel to secure cabinet to chassis. 10. Mount filter bracket in designated opening area. (Note: The filter bracket will only fit in one direction if cabinet is installed properly.) IHT ETUN 5 4 LEFT ETUN 14

15 System leaning and Flushing leaning and Flushing Prior to start up of any heat pump, the water circulating system must be cleaned and flushed of all dirt and debris. If the system is equipped with water shutoff valves, the supply and return runouts must be connected together at each unit location (This will prevent the introduction of dirt into the unit, see Figure 7). The system should be filled at the water make-up connection with all air vents open. After filling, vents should be closed. Figure 7: Flushing with Water Shutoff Valve Equipped Systems eturn unout Supply unout The contractor should start the main circulator with the pressure reducing valve Mains makeup open. Vents should be checked in sequence to bleed off any trapped ubber Hose air and to verify circulation through all components of the system. unouts Initially onnected Together As water circulates through the system, the contractor should check and repair any leaks found in the piping system. Drain(s) at the lowest point(s) in the system should be opened for initial flush and blowdown, making sure water fill valves are set at the same rate. heck the pressure gauge at the pump suction and manually adjust the make-up water valve to hold the same positive pressure both before and after opening the drain valves. Flushing should continue for at least two hours, or longer if required, until drain water is clean and clear. The supplemental heater and/or circulator pump, if used, should be shut off. All drains and vents should be opened to completely drain the system. Short-circuited supply and return runouts should now be connected to the unit supply and return connections. efill the system with clean water. Test the system water for acidity and treat as required to leave the water slightly alkaline (ph 7.5 to 8.5). The specified percentage of antifreeze may also be added at this time. Use commercial grade antifreeze designed for HVA systems only. Environol brand antifreeze is recommended.. Once the system has been filled with clean water and antifreeze (if used), precautions should be taken to protect the system from dirty water conditions. Dirty water will result in system-wide degradation of performance, and solids may clog valves, strainers, flow regulators, etc. Additionally, the heat exchanger may become clogged which reduces compressor service life and can cause premature unit failure. In boiler/tower application, set the loop control panel set points to desired temperatures. Supply power to all motors and start the circulating pumps. After full flow has been established through all components including the heat rejector (regardless of season), air vented and loop temperatures stabilized, each of the units will be ready for check, test and start up and for air and water balancing. round Source Loop System heckout Once piping is completed between the unit pumping system and ground loop, final purging and charging of the loop is needed. A high pressure pump is needed to achieve adequate flow velocity in the loop to purge air and dirt particles from the loop itself. Antifreeze solution is used in most areas to prevent freezing. Flush the system adequately to remove as much air as possible; then pressurize the loop to a static pressure of psi (summer) or psi (winter). This is normally adequate for good system operation. Loop static pressure may decrease soon after initial installation, due to pipe expansion and loop temperature change. unning the unit for at least 30 minutes after the system has been completely purged of air will allow for the break-in period. It may be necessary to adjust static loop pressure (by adding water) after the unit has run for the first time. Loop static pressure will also fluctuate with the seasons. Pressures will be higher in the winter months than during the cooling season. This fluctuation is normal and should be considered when charging the system initially. Ensure the pump provides adequate flow through the unit by checking pressure drop across the heat exchanger. Usually gpm of flow per ton of cooling capacity is recommended in earth loop applications. 15

16 Open Loop round Water Systems Always maintain water pressure in the heat exchanger by placing water control valves at the outlet of the unit to prevent mineral precipitation. Use a closed, bladder-type expansion tank to minimize mineral formation due to air exposure. Ensure proper water flow through the unit by checking pressure drop across the heat exchanger and comparing it to the figures in unit capacity data tables in the specification catalog gpm of flow per ton of cooling capacity is recommended in open loop applications. Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways, depending on local codes, i.e. recharge well, storm sewer, drain field, adjacent stream or pond, etc. Most local codes forbid the use of sanitary sewer for disposal. onsult your local building and zoning departments to assure compliance in your area. Note: For open loop/groundwater systems or systems that do not contain an antifreeze solution, set SW1-Switch #2 to the WELL position (efer to the Dip Switch Field Selection table). Slow opening/closing solenoid valves (type VM) are recommended to eliminate water hammer. Water Quality In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be present, a closed loop system is recommended. The heat exchanger coils in ground water systems may, over a period of time, lose heat exchange capabilities due to a buildup of mineral deposits inside. These can be cleaned, but only by a qualified service mechanic, as special solutions and pumping equipment are required. Desuperheater coils can likewise become scaled and possibly plugged. In areas with extremely hard water, the owner should be informed that the heat exchanger may require occasional flushing. Units with cupronickel heat exchangers are recommended for open loop applications due to the increased resistance to build-up and corrosion, along with reduced wear caused by acid cleaning. Material opper 90/10 upronickel 316 Stainless Steel ph Acidity/Alkalinity Scaling alcium and (Total Hardness) (Total Hardness) (Total Hardness) Magnesium arbonate less than 350 ppm less than 350 ppm less than 350 ppm Hydrogen Sulfide Less than 0.5 ppm (rotten egg smell appears at 0.5 ppm) ppm Less than 1 ppm Sulfates Less than 125 ppm Less than 125 ppm Less than 200 ppm hlorine Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm hlorides Less than 20 ppm Less than 125 ppm Less than 300 ppm arbon Dioxide Less than 50 ppm ppm ppm orrosion Ammonia Less than 2 ppm Less than 2 ppm Less than 20 ppm Ammonia hloride Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm Ammonia Nitrate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm Ammonia Hydroxide Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm Ammonia Sulfate Less than 0.5 ppm Less than 0.5 ppm Less than 0.5 ppm Total Dissolved Solids (TDS) Less than 1000 ppm ppm ppm LSI Index +0.5 to to to -0.5 Iron, FE 2 + (Ferrous) Iron Fouling Bacterial Iron Potential < 0.2 ppm < 0.2 ppm < 0.2 ppm (Biological rowth) Less than 1 ppm, above this level Less than 1 ppm, above this level Less than 1 ppm, above this level Iron Oxide deposition will occur deposition will occur deposition will occur Suspended Solids Erosion Threshold Velocity (Fresh Water) NOTES: rains = ppm divided by 17 mg/l is equivalent to ppm Less than 10 ppm and filtered for max. of 600 micron size Less than 10 ppm and filtered for max. of 600 micron size Less than 10 ppm and filtered for max. of 600 micron size < 6 ft/sec < 6 ft/sec < 6 ft/sec 2/22/12 16

17 Electrical onnections eneral Be sure the available power is the same voltage and phase as that shown on the unit serial plate. Line and low voltage wiring must be done in accordance with local codes or the National Electric ode, whichever is applicable. 208 Volt Operation All 208/230 units are factory wired for 230 volt operation. For 208 volt operation, the red and blue transformer wires must be switched. Microprocessor emote Thermostat Wiring Figure 5 Field onnections TB Unit onnections 24 VA ed OMMON Black OMPESSO Y Yellow EVESIN VALVE O Orange FAN reen equires common connection or 24 VA for activation LOKOUT SINAL SHUTDOWN L S Brown Blue X2 X1 W2 17

18 Electrical Data Model ated Voltage Voltage Min/Max ompressor M LA LA Fan Motor FLA Total Unit FLA Min irc Amp Max Fuse/ HA 115/60/1 104/ /60/1 187/ /15 265/60/1 238/ /15 115/60/1 104/ /60/1 187/ /15 265/60/1 238/ / /60/1 187/ /60/1 238/ / /60/1 187/ /60/1 238/ HA circuit breaker in USA only 5/24/18 18

19 Blower Performance Data Model FM Low Speed Medium Speed High Speed Factory settings are in Bold 5/24/2018 Air flow values are with dry coil and standard filter For wet coil performance first calculate the face velocity of the air coil (Face Velocity [fpm] = Airflow [cfm] / Face Area [sq ft]). 19

20 Wiring Schematics AB - EM with emote Stat /60/1 rn EM Motor Module EM Motor Blu ompressor S ed Blk Tan Handi - Box round Lug Unit Power Supply /60/1 or 265/60/1 Fa n Speed Switch Note 2 White Yellow Blue T2 L2 T1 L1 Hig h Low ed Black (31) ed (32) Black Blue 230V/265V Black (25) B 4 2 Black Black (27) Note 1 ed 208V V 470Ω esistor FD LP HP Tra nsformer TB Emerg Shutdown Load Shed Lockout ircuit A 24VA 24VA ommon eversing Valve Fan ompressor A Electric Heat Dehumidification Lockout ircuit B ompressor B ES LS LO1 O Y1 W DH LO2 Y2 Black P2 ES LS ALM AL A OM A NO A N LO P9 O/B Y1 Y2 W DH EH1 2 F K5-Alarm elay K6-Acc elay P8 P9 om2 LED5 S485 NET JW2 B White (12) F F 2 HI S485 NET K4-Fan elay Violet (14) Black (13) om1 LED5 - + P7 Black (15) K2- elay 2 LO K3-2 elay 2 S485 EXP P5 Aurora Base ontrol (AB) EVEVFP1 FP1 FP2 FP2 LPS LPSHPSHPSP4 K1-V elay Orange (01) SW1 V Orange (02) Test Mode - + P6 O EH1 EH2 P3 Yellow T Yellow Y1 Status LED3 470Ω Blue (07) Faul t LED1 F1-3A Off FP1 15 F/30 F FP2 15 F/30 F V B/O Acc Dip 4 Acc Dip 5 Dual/Single L Output Type Future Use Blue (08) Black (09) Black (10) onfig LED2 Y F PWM FM P13 SW2 On Black/White Yellow Yellow ES ES 24V Emergency Shutdown ed ed la ss 2 Black/ White Black/ White reen Brown (23) ondensate L1 Note 3 20

21 Wiring Schematics cont. AB - EM with emote Stat /60/1 Notes: 1 Swap blue and red leads for 208V operation. 2 Factory wired. efer to blower table settings. 3 - When field installed 24VA motorized valve is used, connect to and Y. Accessor y elay Operation SW2-4 SW2-5 ycl e with Blower On On ycle with ompressor Off Off Water Valve Slow Open On Off Outdoor Air Damper Off On Aurora Timing Events Event Normal Mode Test Mode andom Start Delay 5 to 80 seconds 1 second ompressor On Delay 5 seconds < 1 second ompressor Minimum On Time 2 minutes 5 seconds ompressor Short ycl e Delay 4 minutes 15 seconds Blower Off Delay 30 seconds 2 seconds Fault ecognition Delay High Pressure Less than 1 second Less than 1 second Start-Up Bypass Low Pressure 2 minutes 30 seconds Fault ecognition Delay Low Pressure 30 seconds 30 seconds Start-Up Bypass Low Water/Air oil Limit Fault ecognition Delay Low Water/Air oil Limit Fault ecognition Delay ondensate Overflow 2 minutes 30 seconds 30 seconds 30 seconds 30 seconds 30 seconds Thermostat all ecognition Time 2 seconds 2 seconds Auxi liary Heat Stagi ng Del ay Emergency Heat Stagi ng Dela y 5 minutes 2 minutes 20 seconds 7.5 seconds Water Valve Slow Open Delay 90 seconds 90 seconds eheat Delay 30 seconds 30 seconds V Emergency Shutdown ed ed L1 hart 1 Blower Settings High Low L L*09 Yellow White L L*12 Blue Yellow L L*15 Yellow White L L*18 Blue Yellow Factory Low Voltage Wiring Factory Line Voltage Wiring Field Low Voltage Wiring Fi eld Li ne Voltage Wi ri ng Optional Block D Voltage PB Traces Fi eld Zone Sensor Wi ri ng Internal Junction Qui ck on nect Terminal Fi eld Wiring Lug round elay ontacts N.O., N.. apacitor Fuse Temperature Switch ompressor ontactor O ondensate Overflow Sensor ES Emergency Shutdown HP High Pressure Switch LP Low Pressure Switch FD Freeze De tecti on Sensor F1 Fuse Legend 3 T 2 Y 1 Thermistor elay oil Switch - ondensate Overflow Switch - High pressure Switch - Low pressure Polarized connector Light Emitting Diode - reen Light Emitting Diode - Yellow Light Emitting Diode - ed Wire nut SW1 Push button SW2 DIP package 8 position PB Power Block B Blower elay V eversing Valve oil Aurora LED Flash odes Slow Flash Fast Flash Flash ode 1 second on and 1 second off 100 milliseconds on and 100 milliseconds off 100 milliseconds on and 400 milliseconds off with a 2 second pause before repeating andom Start Delay Status LED (LED1, reen) onfiguration LED (LED2, Yellow) Fault LED (LED3, ed) Status LED (LED1, reen) Fast Fl ash Fast Fl ash Fast Fl ash onfiguration LED (LED2, Yellow) Fault LED (LED3, ed) Normal Mode ON No Software Overide Flash EM Setting Normal Mode OFF ontrol is Non-Functional OFF DIP Switch Overide Slow Flash Input Fault Lockout Flash ode 1 Test Mode Slow Flash EM onfigure Mode Fast Flash High Pressure Lockout Flash ode 2 Lockout Active Dehumidification Mode eserved eserved Load Shed ESD eserved Fast Fl ash Flash ode 2 Flash ode 3 Flash ode 4 Flash ode 5 Flash ode 6 Flash ode 7 eset onfigure Mode Off Low Pressure Lockout Low Air oil Limit Lockout - FP2 Low Water oil Limit Lockout - FP1 eserved ondensate Overflow Lockout Over/Under Voltage Shutdown eserved eserved Air/Water oil Limit Sensor Error Flash ode 3 Flash ode 4 Flash ode 5 Flash ode 6 Flash ode 7 Flash ode 8 Flash ode 9 Flash ode 10 Flash ode F Y1 JW2 - Alarm HP HP LP LP FP2 FP2 FP1 FP1 EV EV LO HI F F P2 ES P4 Factory P5 Factory LS PWM FM EM PWM P13 ALM AL SW1 Test A c V K1 K2 Hi K3 Fan K4 Alarm K5 Acc K6 Fi eld onnections A no A nc P9 LO P1 LO LED1 P11 Off FP1 15 o F/30 o F FP2 15 o F/30 o F Faul t V B/O A Dip 4 LED3 A Dip 5 Dual/Single L Pulse/ontinuous Status eheat/normal Factory Use AUOA BASE ONTOL Factory Fan onnection O/B O/B Y1 Y1 Y2 Fi eld onnections Y2 SW2 W W On 1 LED DH DH Y onfig om1 om2 3A-Fuse P3 Factory P6 S 485 EH1 S485 Exp P7 P8 S485 NET EH2 EH1 O N/A (+) (-) 21

22 Y Y ASTON LOW SILL SEIES INSTALLATION MANUAL Wiring Schematics cont. M - with EM Motor and Unit Mounted Thermostat /60/1 EM Motor Brown (26) ompressor reen/yellow EM Motor Module Blue S ed Blk Handi - Box round Lug Unit Power Supply /60/1 or /60/1 Tan (33) Note 4 White Yellow Blue ed T2 L2 T1 L1 Black (31) Black ed (32) Fan Switch High Low Black (25) 4 2 B 5 Black (27) Brown (26) ed (19) PB 1 Black NOTE 1 Blue 230V 265V Transformer ed 208V Yellow 24V Black/White 2 Yellow (13) Electronic THEMOSTAT IN PUT Mode Switch Auto 2 3 Fan White (18) ed (17) ed (11) Ther Black mistor Black T ed (19) ST Yellow (10) Black (12) Black (22) NOTE 2 3 reen (34) FS NOTE 3 HP LP Black/White (1) ed (2) Brown (3) Violet (4) Violet (5) Black (6) Black (7) Blue (8) Blue (9) Yellow (10) HP HP LO LP LP HP HP LO LP LP TEST PIN OMPESSO ONTOL MODULE A Heat T1 T2 T3 24 V A T3 T1 ed Black (12) ed (11) ed Orange ed (17) Fan Mode Sw ontinuous ycled White (18) Black (22) 1 3 White (20) B Shut down Overide J1 T4 T5 T6 B ool T2 T4 T6 T5 SHUT DO WN ed (15) ed (16) Yellow (13) Orange (14) V Orange (21) Blue (T6) Not Used 24VA Shutdown Yellow (13) hart 1 Blower Settings High Low L L*09 Yellow White L L*12 Blue Yellow L L*15 Yellow White L L*18 Blue Yellow Legend Factory low voltage wiring Factory line voltage wiring Field low voltage wiring Field line voltage wiring Quick connect terminal Wire nut - ompressor ontactor DT - Damper Terminal Block FS - Freeze Sensing Device HP - High Pressure Switch LP - Low Pressure Switch PB - Power Block B - Blower elay V - eversing Valve oil ST - Entering Air Temperature Sensor P L Field wire lug Earth round elay ontacts - N.O., N.. Polarized connector HP LP Switch - High Pressure Switch - Low Pressure elay coil apacitor Notes: 1. Swit ch ed a nd Blue wires for 208 volt operation 2. Terminal of 24 V PB is used as L output for Brown wire 3 for Lockout. 3. Optional field installed freeze sensing device. 4. Factory wired. efer to blower table settings. T Thermistor Temperature Switch 22

23 Y Y ASTON LOW SILL SEIES INSTALLATION MANUAL Wiring Schematics cont. M - Low Sill with emote Stat and EM Motor /60/1 EM Motor ompressor reen/yellow EM Motor Module Blue S ed Blk round Lug Handi - Box Unit Power Supply /60/1 or /60/1 Tan (33) Note 3 White Yellow Blue T2 L2 T1 L1 ed Black (31) Fan Switch High Low Black (25) Black 4 2 B 5 Black (27) Brown (26) ed PB 1 Black Blue 230V 265V NOTE 1 ed (32) Transformer NOTE 3 S 4 5 ed 208V 24V Yellow Black/White Brown Black NOTE Y1 O L S X2 X1 W1 Terminal Board ed Black Yellow Orange reen Brown Pink White Not Used PB-2 1 Orange (21) Black (22) reen (00) FS HP LP Black/White (1) ed (2) Brown (3) Violet (4) Violet (5) Black (6) Black (7) Blue (8) Blue (9) Yellow (10) HP HP LO LP LP HP HP LO LP LP TEST PIN OMPESSO ONTOL MODULE 2 Yellow Yellow (10) Orange reen V 1 3 B Violet (4) Violet (5) Pink L L L L Legend Factory low voltage wiring Factory line voltage wiring Factory low voltage wiring Factory line voltage wiring Quick connect terminal Wire nut - ompressor ontactor DT - Damper Terminal Block FS - Freeze Sensing Device HP - High Pressure Switch LP - Low Pressure Switch PB - Power Block B - Blower elay S emote Start/Stop elay V - eversing Valve oil ST - Entering Air Temperature Sensor L1 Wiring lug round elay ontacts - N.O., N.. HP LP T Switch - High Pressure Switch - Low Pressure elay coil apacitor Thermistor Notes: 1. Switch ed and Blue wires for 208 volt operation. 2. Terminal of the 24V PB is used as L output for Brown wire 3 for Lockout. 3. Factory wired. efer to blower table settings. Temperature Switch 23

24 Wiring Schematics cont. AB - with EM Motor and Electronic Stat /60/1 ompr essor EM Motor Blue S Black reen/yellow EM Motor Module Tan (33) T2 ed T1 L2 L1 hart 1 Blower Se ngs High Low L L*09 Yellow White L L*12 Blue Yellow L L*15 Yellow White L L*18 Blue Yellow Fan Speed Switch Note 3 High White Yellow Black (25) Blue Low ed 4 B 2 Black (27) ed Black Bla e Black (12) Electronic THEMOSTAT IN PUT Ther mistor Black Black ST T Mode Switch A Heat 24 V A ed Black (12) Yellow (13) 4 5 Yellow Shut down Overide T1 T2 T3 T4 T5 T6 B ool T3 T1 T2 T4 T6 T5 SHUT ed (11) ed Orange Yellow (13) Orange (14) Blue (T6) Not Used ed (11) ed (17) 6 1 Auto 3 2 Fan White (18) Fan Mode Switch ed (19) J1 DO WN ycled on nuous reen 2 2 F Y1 JW2 - Alarm HP HP LP LP FP2 FP2 FP1 FP1 EV EV LO HI F F P2 ES P4 Factory P5 Factory LS PWM FM EM PWM P13 ALM AL SW1 Test A c V K1 K2 Hi K3 Fan K4 Alarm K5 Acc K6 Fi eld onnections A no A nc P9 LO P1 LO LED1 P11 Off FP1 15 o F/30 o F FP2 15 o F/30 o F Faul t V B/O A Dip 4 LED3 A Dip 5 Dual/Single L Pulse/ontinuous Status eheat/normal Factory Use AUOA BASE ONTOL Factory Fan onnection O/B Fi eld onnections O/B SW2 On 1 LED Y1 Y2 W Y1 Y2 W DH DH Y onfig om1 om2 3A-Fuse P3 Factory P6 S 485 EH1 S485 Exp P7 P8 S485 NET EH2 EH1 O N/A (+) (-) L1 Factory Low Voltage Wiring Factory Line Voltage Wiring Field Low Voltage Wiring Fi eld Li ne Voltage Wi ri ng Optional Block D Voltage PB Traces Fi eld Zone Sensor Wi ri ng Internal Junction Qui ck on nect Terminal Fi eld Wiring Lug round elay ontacts N.O., N.. apacitor Fuse Temperature Switch ompressor ontactor O ondensate Overflow Sensor ES Emergency Shutdown HP High Pressure Switch LP Low Pressure Switch FD Freeze De tecti on Sensor F1 Fuse Legend 3 T 2 Y 1 Orange (14) Thermistor elay oil Switch - ondensate Overflow Switch - High pressure Switch - Low pressure Polarized connector Light Emitting Diode - reen Light Emitting Diode - Yellow Light Emitting Diode - ed Wire nut SW1 Push button SW2 DIP package 8 position PB Power Block B Blower elay V eversi ng Valve oi l 24

25 Wiring Schematics cont. AB - with EM Motor and Electronic Stat /60/1 Handi - Box round Lug Unit Power Supply /60/1 or /60/1 Notes: 1 Swap blue and red leads for 208V operation. 2 Use AL Output for 24V lockout. 3 Factory wired. efer to blower table settings. Black Blue 230V/265V NOTE 1 ed 208V Tra nsformer 24V Yellow Black/White 24V Emergency Shutdown Note 3 P2 ES LS ALM AL A OM A NO A N LO P1 O/B Y1 Y2 W DH EH1 2 F K5-Alarm elay K6-Acc elay reen P8 P9 om2 LED5 S485 NET JW2 B White (12) F F 2 HI S485 NET Black (13) K4-Fan elay om1 LED5 - + P7 Violet (14) Black (15) K2- elay 2 LO K3-2 elay 2 S485 EXP P5 Aurora Base ontrol (AB) EVEVFP1 FP1 FP2 FP2 LPS LPSHPSHPSP4 K1-V elay V Orange (01) SW1 V Orange (02) Test Mode - + P6 O EH1 EH2 P3 Brown (23) ondensate 470 esistor FD LP Yellow T Yellow Y1 Status LED3 470 Blue (07) F1-3A PWM FM Faul t LED1 P13 Off On FP1 15 F/30 F 1 FP2 15 F/30 F 2 V B/O 3 Acc Dip 4 4 Acc Dip 5 5 Dual/Single 6 L Output Type 7 Future Use 8 SW2 onfig LED2 Y Blue (08) HP Black (09) Black (10) F Yellow ES ES ed ed Accessor y elay Operation SW2-4 SW2-5 ycl e with Blower On On ycle with ompressor Off Off Water Valve Slow Open On Off Outdoor Air Damper Off On Aurora Timing Events Event Normal Mode Test Mode andom Start Delay 5 to 80 seconds 1 second ompressor On Delay 5 seconds < 1 second ompressor Minimum On Time 2 minutes 5 seconds ompressor Short ycl e Delay 4 minutes 15 seconds Blower Off Delay 30 seconds 2 seconds Fault ecognition Delay High Pressure Less than 1 second Less than 1 second Start-Up Bypass Low Pressure 2 minutes 30 seconds Fault ecognition Delay Low Pressure 30 seconds 30 seconds Start-Up Bypass Low Water/Air oil Limit Fault ecognition Delay Low Water/Air oil Limit Fault ecognition Delay ondensate Overflow 2 minutes 30 seconds 30 seconds 30 seconds 30 seconds 30 seconds Thermostat all ecognition Time 2 seconds 2 seconds Auxi liary Heat Stagi ng Del ay Emergency Heat Stagi ng Dela y 5 minutes 2 minutes 20 seconds 7.5 seconds Water Valve Slow Open Delay 90 seconds 90 seconds eheat Delay 30 seconds 30 seconds Aurora LED Flash odes Slow Flash Fast Flash Flash ode 1 second on and 1 second off 100 milliseconds on and 100 milliseconds off 100 milliseconds on and 400 milliseconds off with a 2 second pause before repeating andom Start Delay Status LED (LED1, reen) onfiguration LED (LED2, Yellow) Fault LED (LED3, ed) Status LED (LED1, reen) Fast Fl ash Fast Fl ash Fast Fl ash onfiguration LED (LED2, Yellow) Fault LED (LED3, ed) Normal Mode ON No Software Overide Flash EM Setting Normal Mode OFF ontrol is Non-Functional OFF DIP Switch Overide Slow Flash Input Fault Lockout Flash ode 1 Test Mode Slow Flash EM onfigure Mode Fast Flash High Pressure Lockout Flash ode 2 Lockout Active Dehumidification Mode eserved eserved Load Shed ESD eserved Fast Fl ash Flash ode 2 Flash ode 3 Flash ode 4 Flash ode 5 Flash ode 6 Flash ode 7 eset onfigure Mode Off Low Pressure Lockout Low Air oil Limit Lockout - FP2 Low Water oil Limit Lockout - FP1 eserved ondensate Overflow Lockout Over/Under Voltage Shutdown eserved eserved Air/Water oil Limit Sensor Error Flash ode 3 Flash ode 4 Flash ode 5 Flash ode 6 Flash ode 7 Flash ode 8 Flash ode 9 Flash ode 10 Flash ode 11 25

26 ontrols ontrol eneral Description Application Display/Interface Protocol Thermostat Options M ontrol The M (ompressor control module) is a more reliable replacement for electro-mechanical control applications. It features a small microprocessor board that handles the lockout function of the unit. A second microporcessor handles the unit mounted thermostat for maintaining accurate room temperature. esidential and commercial applications requiring minimal but reliable controls. Includes andom Start, High and low pressure switches and auto changeover capability. Dial thermostat with Hi and Low blower speeds, and auto changeover or cont blower selection switches. None Unit Mounted Digital Dial Thermostat emote Mounted Standard Thermostat Standard M ontrol Features ompressor control module (M) controls are standard on the Aston Series Low Sill onsole heat pump. This control features unit mounted thermostat and switches, Features of the standard control are: Easy to understand color coded thermostat adjustment markings. Large, rocker type mode and blower switches. Internally mounted blower switch to choose cycled or constant blower operation. High pressure and low pressure safety controls to protect the unit components. Lockout circuit to shut down unit operation upon receipt of a fault indicator from the safety controls. A 24 volt control circuit allows for safe and easy diagnosis. In the ool mode, a call for cooling by the thermostat energizes the reversing valve and closes the compressor contactor contacts, energizing the compressor, which will run until the thermostat is satisfied. If either the low or high pressure safety switches are opened, the compressor and reversing valve are disabled by the lockout relay. Unit operation will resume only after the voltage to the unit is interrupted or the mode switch is placed in the Off position. The user selects either Heat/ool or Fan Only on the mode switch, then either High or Low at the blower speed switch. The temperature can be controlled by rotating the thermostat control knob. Unit Mounted ontrol The Fan Only setting provides constant blower operation. In the Heat mode, a call for heat by the thermostat closes the compressor contactor contacts, energizing the compressor, which will run until the thermostat is satisfied. 26

27 ontrols cont. Aurora Base ontrol NOTE: efer to the Aurora Base ontrol Application and Troubleshooting uide and the Instruction uide: Aurora Interface and Diagnostics (AID) Tool for additional information. ontrol Features Software AB Standard Version 3.0 Single or Dual apacity ompressors Either single or dual capacity compressors can be operated. Variable Speed EM Blower Motor Option (If Applicable) A Variable Speed EM blower motor can be driven directly using the onboard PWM output. Four blower speeds are available based upon the, Y1, Y2, and W input signals to the board. The blower speeds can be changed either by the EM manual configurations mode method or by using the Aurora AID Tool directly. All four blower speeds can be set to the same speed if desired. 5-Speed EM Blower Motor Option (If Applicable) A 5-Speed EM blower motor will be driven directly using the thermostat connections. Any of the, Y1, or Y2/W signals can drive any of the 5 available pre-programmed blower speeds on the motor. All 5 Series "" vintage units will be wired this way at the factory. Other ontrol Features andom start at power up Anti-short cycle protection High and low pressure cutouts Loss of charge Water coil freeze detection Air coil freeze detection Over/under voltage protection ondensate overflow sensor Load shed Dehumidification (where applicable) Emergency shutdown Hot gas reheat operation (where applicable) Diagnostic LED Test mode push button switch Two auxiliary electric heat outputs Alarm output Accessory output with N.O. and N.. Two Modbus communication Ports Field Selectable Options via Hardware DIP Switch (SW1) Test/onfiguration Button (See SW1 Operation Table) Test Mode The control is placed in the test mode by holding the push button switch SW1 for 2-5 seconds. In test mode most of the control timings will be shortened by a factor of sixteen (16). LED3 (green) will flash at 1 second on and 1 second off. Additionally, when entering test mode LED1 (red) will flash the last lockout one time. Test mode will automatically time out after 30 minutes. Test mode can be exited by pressing and holding the SW1 button for 2 to 5 seconds or by cycling the power. NOTE: Test mode will automatically be exited after 30 minutes. Variable Speed EM onfiguration Mode (If Applicable) The control is placed in the EM configuration mode by holding the pushbutton switch SW1 for 5 to 10 seconds, the high, low, and EM speeds can be selected by following the LED display lights. LED2 (yellow) will fast flash when entering the EM configuration. When setting speed LED3 (green) will be continuously lit, for low speed LED1 (red) will be continuously lit, and for high speed both LED3 (green) and LED1 (red) will be continuously lit. During the EM configuration mode LED2 (yellow) will flash each of the 12 possible blower speeds 3 times. When the desired speed is flashed press SW1, LED2 will fast flash until SW1 is released. speed has now been selected. Next select low speed, and high speed blower selections following the same process above. After third selection has been made, the control will exit the EM configuration mode. Aux fan speed will remain at default or current setting and requires the AID Tool for adjustment. eset onfiguration Mode The control is placed in reset configuration mode by holding the push button switch SW1 for 50 to 60 seconds. This will reset all configuration settings and the EEPOM back to the factory default settings. LED3 (green) will turn off when entering reset configuration mode. Once LED3 (green) turns off, release SW1 and the control will reset. DIP Switch (SW2) SW2-1 FP1 Selection Low water coil temperature limit setting for freeze detection. On = 30 F; Off = 15 F. SW2-2 FP2 Selection On = 30 F; Off = N/A SW2-3 V O/B - thermostat type. Heat pump thermostats with O output in cooling or B output in Heating can be selected. On = O; Off = B. SW2-4 Access elay Operation (P2) and 2-5 Access elay Operation SW2-4 SW2-5 ycle with Blower ON ON ycle with ompressor OFF OFF Water Valve Slow Opening ON OFF ycle with omm. T-stat Hum md OFF ON 27

28 ontrols cont. ycle with Blower - The accessory relay will cycle with the blower output. ycle with ompressor - The accessory relay will cycle with the compressor output. Water Valve Slow Opening - The accessory relay will cycle and delay both the blower and compressor output for 90 seconds. SW2-6 Operation selection of single or dual capacity compressor. On = Single Stage; Off = Dual apacity SW2-7 Lockout and Alarm Outputs (P2) selection of a continuous or pulsed output for both the LO and ALM Outputs. On = ontinuous; Off = Pulsed SW2-8 Future Use Alarm Jumper lip Selection From the factory, ALM is connected to 24 VA via JW2. By cutting JW2, ALM becomes a dry contact connected to AL. Variable Speed EM Blower Speeds The blower speeds can be changed either by using the EM manual configurations mode method or by using the Aurora AID Tool directly (see Instruction uide: Aurora Interface and Diagnostics (AID) Tool topic). Field Selectable Options via Software (Selectable via the Aurora AID Tool) EM Blower Speeds An EM blower motor can be driven directly using the onboard PWM output. Four blower speeds are available, based upon the, Y1 (low), Y2 (high), and Aux input signals to the board. The blower speeds can be changed either by the EM manual configurations mode method (see EM onfiguration Mode topic) or by using the Aurora AID Tool directly. All four blower speeds can be set to the same speed if desired. Aux blower speed will remain at default or current setting and requires the AID Tool for adjustment. Safety Features The following safety features are provided to protect the compressor, heat exchangers, wiring and other components from damage caused by operation outside of design conditions. Fuse a 3 amp automotive type plug-in fuse provides protection against short circuit or overload conditions. Anti-Short ycle Protection 4 minute anti-short cycle protection for the compressor. andom Start 5 to 80 second random start upon power up. Fault etry in the fault condition, the control will stage off the outputs and then try again to satisfy the thermostat Y input call. Once the thermostat input calls are satisfied, the control will continue on as if no fault occurred. If 3 consecutive faults occur without satisfying the thermostat Y input call, then the control will go to Lockout mode. Lockout when locked out, the blower will operate continuously in speed, and PS blower motor output will remain on. The Alarm output (ALM) and Lockout output (L) will be turned on. The fault type identification display LED1 (ed) shall flash the fault code. To reset lockout conditions with SW2-8 On, thermostat inputs Y1, Y2, and W must be removed for at least 3 seconds. To reset lockout conditions with SW2-8 Off, thermostat inputs Y1, Y2, W, and DH must be removed for at least 3 seconds. Lockout may also be reset by turning power off for at least 30 seconds or by enabling the emergency shutdown input for at least 3 seconds. Lockout With Emergency Heat - if the control is locked out in the heating mode, and a Y2 or W input is received, the control will operate in the emergency heat mode while the compressor is locked out. The first emergency heat output will be energized 10 seconds after the W input is received, and the blower will shift to high speed. If the control remains locked out, and the W input is present, additional stage of emergency heat will stage on after 2 minutes. When the W input is removed, all of the emergency heat outputs will turn off, and the EM blower will shift to speed and PS blower motor output will remain on. High Pressure fault is recognized when the Normally losed High Pressure Switch, P4-9/10 opens, no matter how momentarily. The High Pressure Switch is electrically in series with the ompressor ontactor and serves as a hardwired limit switch if an overpressure condition should occur. Low Pressure - fault is recognized when the Normally losed Low Pressure Switch, P4-7/8 is continuously open for 30 seconds. losure of the LPS any time during the 30 second recognition time restarts the 30 second continuous open requirement. A continuously open LPS shall not be recognized during the 2 minute startup bypass time. Loss of harge fault is recognized when the Normally losed Low Pressure Switch, P4-7/8 is open prior to the compressor starting. ondensate Overflow - fault is recognized when the impedance between this line and 24 VA common or chassis ground drops below 100K ohms for 30 seconds continuously. Freeze Detection (oax) - set points shall be either 30 F or 15 F. When the thermistor temperature drops below the selected set point, the control shall begin counting down the 30 seconds delay. If the thermistor value rises above the selected set point, then the count should reset. The resistance value must remain below the selected set point for the entire length of the appropriate delay to be recognized as a fault. This fault will be ignored for the initial 2 minutes of the compressor run time. Freeze Detection (Air oil) - uses the FP2 input to protect against ice formation on the air coil. The FP2 input will operate exactly like FP1 except that the set point is 30 degrees and is not field adjustable. 28

29 ontrols cont. Over/Under Voltage Shutdown - An over/under voltage condition exists when the control voltage is outside the range of 18 VA to 30 VA. If the over/under voltage shutdown lasts for 15 minutes, the lockout and alarm relay will be energized. Over/under voltage shutdown is selfresetting in that if the voltage comes back within range of 18 VA to 30 VA for at least 0.5 seconds, then normal operation is restored. Operation Description Power Up - The unit will not operate until all the inputs and safety controls are checked for normal conditions. The unit has a 5 to 80 second random start delay at power up. Then the compressor has a 4 minute anti-short cycle delay after the random start delay. Standby In standby mode, Y1, Y2, W, DH, and are not active. Input O may be active. The blower and compressor will be off. Heating Operation Single ompressor Heating, 2nd Stage (Y1, Y2) The compressor will be staged to full capacity 20 seconds after Y2 input is received. The EM blower will shift to high speed seconds after the Y2 input is received. Dual ompressor Heating, 2nd Stage (Y1, Y2) In dual compressor operation, two AB boards used in 24 VA operation, there will be a Y2 call to the Y1 input on the second AB. The compressor will stage to full capacity 30 seconds after Y1 input is received to the second board. Single ompressor Heating, 3rd Stage (Y1, Y2, W) The hot water pump is de-energized and the first stage of electric heat is energized 10 seconds after the W command is received. If the demand continues the second stage of electric heat will be energized after 5 minutes. Dual ompressor Heating, 3rd Stage (Y1, Y2, W) - The first stage of electric heat is energized 10 seconds after the W command is received. If the demand continues the second stage of electric heat will be energized after 5 minutes Emergency Heat (W) - The blower will be started on speed, 10 seconds later the first stage of electric heat will be turned on. 5 seconds after the first stage of electric heat is energized the blower will shift to Aux speed. If the emergency heat demand is not satisfied after 2 minutes the second electric heat stage will be energized. ooling Operation In all cooling operations, the reversing valve directly tracks the O input. Thus, anytime the O input is present, the reversing valve will be energized. Single ompressor ooling, 2nd Stage (Y1, Y2, 0) The compressor will be staged to full capacity 20 seconds after Y2 input was received. The EM blower will shift to high speed 15 seconds after the Y2 input was received. Dual ompressor ooling, 2nd Stage (Y1, Y2, O) In dual compressor operation, two AB boards used in 24 VA operation, there will be a Y2 call to the Y1 input on the second AB. The compressor will stage to full capacity 30 seconds after Y1 input is received to the second board. Blower () - The blower will start immediately upon receiving a thermostat command. If there are no other commands from the thermostat the EM will run on speed until the command is removed. egardless of blower input () from the thermostat, the blower will remain on for 30 seconds at the end of each heating, cooling, and emergency heat cycle. Dehumidification (Y1, O, DH or Y1, Y2, O, DH) - When a DH command is received from the thermostat during a compressor call for cooling the EM blower speed will be reduced by 15% to increase dehumidification. Emergency Shutdown - Four (4) seconds after a valid ES input, P2-7 is present, all control outputs will be turned off and remain off until the emergency shutdown input is no longer present. The first time that the compressor is started after the control exits the emergency shutdown mode, there will be an anti-short cycle delay followed by a random start delay. Input must be tied to common to activate. ontinuous Blower Operation - The blower output will be energized any time the control has a input present, unless the control has an emergency shutdown input present. The blower output will be turned off when input is removed. Load Shed - The LS input disables all outputs with the exception of the blower output. When the LS input has been cleared, the anti-short cycle timer and random start timer will be initiated. Input must be tied to common to activate. Blower () - The blower will start immediately upon receiving a thermostat command. If there are no other commands from the thermostat the EM will run on speed until the command is removed. egardless of blower input () from the thermostat, the blower will remain on for 30 seconds at the end of each heating cycle. 29

30 ontrols cont. Aurora Base ontrol LED Displays These three LEDs display the status, configuration, and fault codes for the control. These can also be read in plain English via the Aurora AID Tool. Status LED (LED3, reen) Description of Operation Fault LED, reen Normal Mode ON ontrol is Non-functional OFF Test Mode Slow Flash Lockout Active Fast Flash Dehumidification Mode Flash ode 2 (Future Use) Flash ode 3 (Future Use) Flash ode 4 Load Shed Flash ode 5 ESD Flash ode 6 (Future Use) Flash ode 7 onfiguration LED (LED2, Yellow) Description of Operation No Software Overwritten DIP Switch was Overwritten EM onfiguration Mode Fault LED (LED1, ed) ed Fault LED onfiguration LED, Yellow Flashing EM Setting Slow Flash Fast Flash LED Flash ode* Lockout eset/ emove Normal - No Faults OFF Fault - Input 1 No Auto Fault - High Pressure 2 Yes Hard or Soft Fault - Low Pressure 3 Yes Hard or Soft Fault - Freeze Detection FP2 4 Yes Hard or Soft Fault - Freeze Detection FP1 5 Yes Hard or Soft Fault - ondensate Overflow 7 Yes Hard or Soft Fault - Over/Under Voltage 8 No Auto Fault - FP1 & FP2 Sensor Error 11 Yes Hard or Soft NOTE: All codes >11 use long flash for tens digit and short flash for the ones digit. 20, 30, 40, 50, etc. are skipped. AB Basic Faults Aurora Interface and Diagnostics (AID) Tool The Aurora Interface and Diagnostics (AID) Tool is a device that is a member of the Aurora network. The AID Tool is used to troubleshoot equipment which uses the Aurora control via Modbus TU communication. The AID Tool provides diagnostics, fault management, EM setup, and system configuration capabilities to the Aurora family of controls. An AID Tool is recommended, although not required, for EM airflow settings. The AID Tool simply plugs into the exterior of the cabinet in the AID Tool port. AB ontrol Board Layout 2 2 F Y1 JW2 - Alarm HP HP LP LP FP2 FP2 FP1 FP1 EV EV LO HI F F Factory Factory P2 P4 P5 PWM FM EM PWM P13 SW1 Test V K1 K2 Hi K3 Fan K4 Alarm K5 Acc K6 Fi eld onnections Faul t LED3 A Dip 5 Dual/Single L Pulse/ontinuous Status eheat/normal P9 LO P1 LED1 Factory Use P11 AUOA BASE ONTOL Off FP1 15 o F/30 o F FP2 15 o F/30 o F V B/O A Dip 4 Factory Fan onnection O/B Y1 Y2 Fi eld onnections 8 SW2 W On 1 LED2 2 Y 3 onfig DH om1 om2 3A-Fuse P3 Factory P6 S485 Exp P7 S 485 P8 S485 NET EH1 EH2 EH1 O N/A (+) (-) ES LS ALM AL A c A no A nc LO O/B Y1 Y2 W DH 30

31 ontrols cont. Aurora Advanced ontrol Features The Aurora Advanced ontrol system expands on the capability of the Aurora Base ontrol (AB) by adding the Aurora Expansion Board (AXB). All of the preceding features of the Aurora Base ontrol are included. The following control description is of the additional features and capability of the Aurora advanced control. It is highly recommended the installing/servicing contractor obtain an Aurora Interface and Diagnostic Tool (AID) and specialized training before attempting to install or service an Aurora Advanced control system. The additional AXB features include the following: AXB DIP Switch DIP 1 - ID: This is the AXB ModBus ID and should always read On. DIP 2 & 3 - Future Use DIP 4 & 5 - Accessory elay2: A second, DIP configurable, accessory relay is provided that can be cycled with the compressor 1 or 2, blower, or the Dehumidifier (DH) input. This is to complement the Accessory 1 elay on the AB board. Position DIP 4 DIP 5 Description 1 ON ON ycles with Fan or EM (or ) 2 OFF ON ycles with 1 first stage of compressor or compressor spd 6 3 ON OFF ycles with 2 second stage of compressor or compressor spd OFF OFF ycles with DH input from AB board Advanced Hot Water enerator ontrol (Domestic Hot Water Option) In lieu of the Base Hot Water enerator ontrol, the Advanced features an AID Tool selectable temperature limit and microprocessor control of the process. This will maximize hot water generation and prevent undesirable energy use. An alert will occur when the hot water input temperature is at or above setpoint (100 F F) for 30 continuous seconds (130 F is the default setting). This alert will appear as an E15 on the AID Tool and the hot water pump de-energizes. Hot water pump operations resume on the next compressor cycle or after 15 minutes of continuous compressor operation during the current thermostat demand cycle. Since compressor hot gas temperature is dependent on loop temperature in cooling mode, loop temperatures may be too low to allow proper heating of water. The control will monitor water and refrigerant temperatures to determine if conditions are satisfactory for heating water. LED1 (red LED) will flash code 15 when the DHW limit is reached and when conditions are not favorable for water heating. Error code 15 will also be displayed on the AID Tool in the fault screen. This flash code is a noncritical alert and does not necessarily indicate a problem. ompressor Monitoring The AXB includes two current transducers to monitor the compressor current and starting characteristics. Open circuits or welded contactor faults will be detected. A fault will produce an E10 code. IntelliZone2 Zoning ompatibility (Optional IntelliZone2 Zoning) A dedicated input to connect and communicate with the IntelliZone2 (IZ2) zoning system is provided on P7. The is a dedicated communication port using a proprietary ModBus protocol. An AXB can be added to other selected AB-only systems as well. Then an advanced communicating IntelliZone2 zoning system can be added to AB-only systems. onsult the IntelliZone2 literature for more information. Variable Speed Pump This input and output are provided to drive and monitor a variable speed pump. The VS pump output is a PWM signal to drive the variable speed pump. The minimum and maximum level are set using the AID Tool. 75% and 100% are the default settings respectively. The VS data input allows a separate PWM signal to return from the pump giving fault and performance information. Fault received from the variable speed pump will be displayed as E16. Modulating Water Valve This output is provided to drive a modulating water valve. Through advanced design the 0-10VD valve can be driven directly from the VS pump output. The minimum and maximum level are set in the same way as the VS pump using the AID Tool. 75% and 100% are the default settings respectively. Loop Pump Linking This input and output are provided so that two units can be linked together with a common flow center. When either unit has a call for loop pump, both unit s loop pump relays and variable speed pumps are energized. The flow center then can simply be wired to either unit. The output from one unit should be routed to the input of the other. If daisy chained up to 16 heat pumps can be wired and linked together in this fashion. 31