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Heat Controller DXM2 manual

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Table of contents for the manual

  • Page 1

    Heat Controller , Inc. • 1900 Wellworth A ve. • Jackson, MI 49203 • (517)787-2100 • www .heatcontroller .com APPLICA TION, OPERA TION & MAINTEN ANCE MANU AL DXM2 Digital Heat Pump Controller[...]

  • Page 2

    2 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. T able of Contents DXM2 Electronic Heat Pump Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 DXM2 Physical Dimensions & Layout . . . . . .[...]

  • Page 3

    3 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual DXM2 OVERVIEW The manufacturer’s next generation control board, DXM2, is the geothermal industry’s fi rst two-way communication. The DXM2 electronic control is a robust, microprocessor based heat pump controller that is advanced and feature- laden for [...]

  • Page 4

    4 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. P1 Alarm Relay Comp Relay O Y1 Y2 W G C R AL1 24Vdc EH1 EH2 P6 R C Off On JW3 A OVR ESD C R NSB AL2 JW1 Acc1 Relay Acc2 Relay H COM NC1 NO1 COM NC2 NO2 P3 CO RV RV LT1 LT1 LT2 LT2 LP LP HP HP P7 Status Fault R R CC CCG CO S1 S2 1 12 1 4 Factory Use (240V ac[...]

  • Page 5

    5 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual DXM2 Layout and Connections P1 Alarm Relay Comp Relay O Y1 Y2 W G C R AL1 24Vdc EH1 EH2 P6 R C Off On JW3 A OVR ESD C R NSB AL2 JW1 Acc1 Relay Acc2 Relay H COM1 NC1 NO1 COM2 NC2 NO2 P3 CO RV RV LT1 LT1 LT2 LT2 LP LP HP HP P7 Status Fault R R CC CCG CO S1 S2[...]

  • Page 6

    6 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. FIELD SELECT ABLE INPUTS T est mode: T est mode allows the service technician to check the operation of the control in a timely manner . By momentarily pressing the TEST pushbutton, the DXM2 control enters a 20 minute test mode period in which all time dela[...]

  • Page 7

    7 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual On = Heat Pump. Off = Heat/Cool. DIP 1.4: Thermostat T ype (O/B) - Provides selection of thermostat type. Heat pump thermostats with “O” output on with Cooling or “B” output on with Heating can be selected. On = HP Stat with O output with cooling. O[...]

  • Page 8

    8 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. SAFETY FEA TURES 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. Anti-Short Cycle Protection - The control features a 5 minute [...]

  • Page 9

    9 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual compressor run cycle. When the T est mode is active, the Fault LED will display a fault code of 5 for a L T2 fault. Fault Code 6: Condensate Over fl ow - The Condensate Over fl ow sensor must sense over fl ow levels for 30 continuous seconds to be recogn[...]

  • Page 10

    10 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. Note: The compressor will have a 5-minute anti-short cycle delay at power-up. Standby/Fan Only - In Standby Mode, the compressor will be off. The selected fan output(s) and R V relay may be on if appropriate inputs are present. If there is demand for const[...]

  • Page 11

    11 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual will change to the appropriate Heating Stage 3 air fl ow . With continuing Heating Stage 3 demand, EH2 will turn on after 10 minutes. EH1 and EH2 are turned off immediately when the Heating Stage 3 demand is removed, and the control reverts to Heating Sta[...]

  • Page 12

    12 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. air fl ow for the current operating mode. For the fi rst 30 seconds of blower operation, the target air fl ow will be 50% of the normal target air fl ow . For the next 90 seconds of blower operation, the target air fl ow will be 75% of the normal targ[...]

  • Page 13

    13 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual to the compressor output. All other heat pump operating modes will operate normally , and the accessory relay will be off in all other operating modes. Thermostat Inputs – T able 5 shows the resulting demand from differing combinations of inputs. Y1 – [...]

  • Page 14

    14 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. DXM2 Controls setback is not connected and NSB is connected to Ground “C”, then if OVR is momentarily connected to 24V AC (minimum 1 second) then the OVR input is recognized as a Night Setback Override signal and the DXM2Control reverts from Night Setb[...]

  • Page 15

    15 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual DXM2 Controls T able 7: Replacement Thermistor L T1, L T2 Part Numbers Thermistor T ype T ube OD Lead Length (in.) 36 48 96 192 L T1 (Gray) 3/8, 1/2 17B0005N06 N/A 17B0005N04 N/A 5/8, 7/8 N/A N/A 17B0004N01 N/A L T2 (Violet) 3/8, 1/2 N/A 17B0005N02 N/A 17B[...]

  • Page 16

    16 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. T able 9: Nominal resistance at various temperatures DXM2 Service & Application Notes T able 8: 1% Sensor Calibration Points T emp (°F) Minimum Resistance (Ohm) Maximum Resistance (Ohm) Nominal Resistance (Ohm) 78.5 9523 9715 9619 77.5 9650 9843 9746 [...]

  • Page 17

    17 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Thermostat Compatibility Most all heat pump and heat/cool thermostats can be used with the DXM2 Control. For additional diagnostic capabilities, the communicating thermostat is recommended. Anticipation Leakage Current Maximum leakage current for “Y1” [...]

  • Page 18

    18 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. General T roubleshooting Basic DXM2 board troubleshooting in general is best summarized as simply verifying inputs and outputs. After this process has been veri fi ed, con fi dence in board operation is con fi rmed and the trouble must be else where. Be[...]

  • Page 19

    19 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual General T o properly con fi gure and troubleshoot advanced control features, and to aid in troubleshooting basic control features, a communicating thermostat or diagnostic tool with similar capabilities should be used. System Con fi guration All factory [...]

  • Page 20

    20 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. Advanced T roubleshooting and Con fi guration Information Service Mode The Service Mode provides the installer with several functions for troubleshooting, including Manual Operation, Control Diagnostics, Control Con fi guration, and Fault History . Manua[...]

  • Page 21

    21 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Use the following troubleshooting fl ow chart to fi nd appropriate tr oubleshooting strategies on the following pages for the DXM2 control and most water sour ce heat pump applications. T roubleshooting Chart See “ Does not Operate in Clg” See “ On[...]

  • Page 22

    22 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. DXM2 Wiring Diagram with Motorized Modulating W ater V alve - Optional 96B0005N62 This diagram includes typical wiring details but is not applicable to all units. For speci fi c unit wiring, refer to the diagram or the units’ control panel. 024-060 7602[...]

  • Page 23

    23 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual DXM2 Wiring Diagram (Standard Installation) - 96B0005N56 This diagram includes typical wiring details but is not applicable to all units. For speci fi c unit wiring, refer to the diagram or the units’ control panel. 024-060 7602-443 ‘HG’[...]

  • Page 24

    24 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. Functional T roubleshooting  CAUTION!  CAUTION! Do not restart units without inspection and remedy of faulting condition. Equipment damage may occur . Fault Ht g Clg Possible Cause Solution Main Power Pr oblems X X Green status LED off Check Line V o[...]

  • Page 25

    25 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Functional T roubleshooting (cont.) No Fault Code Shown X X No compressor operation See 'Only Fan Operates' X X Compressor overload Check and replace if necessary X X Control board Reset power and check operation Unit Short Cycles X X Dirty air f[...]

  • Page 26

    26 Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller , Inc. Symptom Ht g Clg Possible Cause Solution Insufficient Capacity/ X X Dirty filter Replace or clean Not Cooling or Heating Rduced or no air flow Check for dirty air filter and clean or replace Pr operly in heating Check fan motor operation and airflow restri[...]

  • Page 27

    27 Heat Controller , Inc. DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Notes:[...]

  • Page 28

    4/2012[...]