Summary of Contents for Heat Controller DXM2
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Page 1: Heat Pump Controller
APPLICATION, OPERATION & MAINTENANCE MANUAL DXM2 Digital Heat Pump Controller Heat Controller, Inc. • 1900 Wellworth Ave. • Jackson, MI 49203 • (517)787-2100 • www.heatcontroller.com... -
Page 2: Table Of Contents
DXM2 Wiring Diagram with Motorized Modulating Water Valve - Optional 96B0005N62 ...... -
Page 3: Dxm2 Electronic Heat Pump Controls
• Multiple blower confi guration options air, leaving water, and entering water temperature sensors. • Electric heat outputs The DXM2 has an RS485 communications port to interface • Accessory water valve connection with a communicating thermostat or other compatible controls. -
Page 4: Dxm2 Physical Dimensions & Layout
DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Heat Controller, Inc. DXM2 Physical Dimensions & Layout 5" (240Vac) A+ 24V (240Vac) N.C. N.O. N.O. Fan Enable Fan Speed Test Micro Alarm Relay Fault Status 6 1/2" 7" Factory low voltage molex... -
Page 5: Dxm2 Layout And Connections
DXM2 UNIT CONTROLS Heat Controller, Inc. Application, Operation, & Maintenance Manual DXM2 Layout and Connections Communicating Service tool stat connection connection (240Vac) A+ 24V (240Vac) N.C. N.O. N.O. Fan Enable Fan Speed Test Button Conventional stat connection to Speed up... -
Page 6: Dxm2 Controls
1 or Stage 2 call from the thermostat. This is used with sensor is colder than the LT2 sensor. or, Dual Stage units (2 compressors where 2 DXM2 Controls are being used) or with master/slave applications. In b) the compressor is On in Heating Mode and the LT2 master/slave applications, each compressor and fan will sensor is colder than the LT1 sensor. - Page 7 In most DIP 1.5: Dehumidifi cation Mode - Provides selection of confi gurations, the DXM2 will operate as a master device. normal or Dehumidifi cation Fan Mode. In Dehumidifi cation Mode, the fan speed will be adjusted for Cooling. In Normal On = Communicating Master device (default).
- Page 8 Equipment damage may occur. components from damage caused by operation outside of design conditions. the DXM2 is in Lockout Mode, and the W input becomes active, then Emergency Heat Mode will occur during Anti-Short Cycle Protection - The control features a 5 Lockout.
- Page 9 0.5 seconds, then normal operation is restored. When the Test mode is active, the Fault LED will display a This is not considered a fault or lockout. If the DXM2 is in fault code of 10 for an ECM Blower fault.
- Page 10 The RV relay will not directly track the input demands for Stage 1 immediately, and the control reverts to Heating RV, the DXM2 Control will employ “smart RV” control. Stage 1 Mode. If there is a Master/Slave situation or a Dual...
- Page 11 The selected fan output(s) will turn off after the selected heating blower off delay and the control reverts to b) ECM Blower – If the DXM2 is confi gured for an ECM Standby Mode. blower, OR an ECM blower is detected, the DXM2...
- Page 12 Note: Digital Night Setback feature requires a airfl ow before the beginning of the blower off delay. compatible thermostat. Contact the manufacturer for d) Default Blower Operation – If the DXM2 confi guration is information on compatible thermostats. incorrect or incomplete with an ECM Blower connected, Mechanical Night Setback –...
- Page 13 G are once again monitored for 2 hours. After the 2 hour O – O is the input for Reversing Valve Relay if DIP1.3 = override period, the DXM2 reverts back to ignoring Y1, Y2, on and DIP1.4 = on. O is the input for Heating Stage 2 if W1, O, and G, assuming the NSB input is still connected DIP1.3 = off.
- Page 14 Electric Heat – Outputs EH1 and EH2 turn on whenever H – The H input function is determined by the setting of the DXM2 Control is in the following modes: Heating Stage DIP2.7, assuming the control is not controlling a internal 3, Emergency Heat, and Boilerless Operation.
- Page 15 The Secondary Fault types will not “overwrite” the Primary fault memory. See Table 3: “LED and Alarm Relay Operation”. Communications The DXM2 has a single RS485 communications port that provides communication capabilities for communicating thermostats or connecting with other communicating controls.
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Page 16: Dxm2 Service & Application Notes
42.8 24.17 168.8 1.43 Thermistor Temperature Sensors – The thermistors used 44.6 23.02 170.6 1.39 with the DXM2 are NTC (negative temperature coeffi cient) 46.4 21.92 172.4 1.34 48.2 20.88 174.2 1.30 type. Table 7 shows the replacement part numbers for the 50.0... - Page 17 • “AL1” and “AL2” originate from the Alarm Relay. • “A” is paralleled with the compressor output for use with well water solenoid valves. Safety Listing The DXM2 Control is listed under UL 873, and is CE listed under IEC 60730.
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Page 18: Basic Troubleshooting Information
Heat Controller, Inc. Basic Troubleshooting Information General Troubleshooting Basic DXM2 board troubleshooting in general is best summarized as simply verifying inputs and outputs. After this process has been verifi ed, confi dence in board operation is confi rmed and the trouble must be else where. -
Page 19: Advanced Troubleshooting And Confi Guration Information
Blower, ECM Blower, or PSC confi gurations. Non-ECM Confi guration – If the DXM2 is not confi gured to Loop Confi guration – When replacing a control in the control an ECM blower, the airfl ow selections will not be fi... - Page 20 The fault history covering the last fi ve lockout conditions is stored and may be retrieved from the DXM2. After a specifi c fault in the fault history is selected, the operating mode and time when the fault occurred are displayed, with options to select specifi...
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Page 21: Troubleshooting Chart
Application, Operation, & Maintenance Manual Troubleshooting Chart Use the following troubleshooting fl ow chart to fi nd appropriate troubleshooting strategies on the following pages for the DXM2 control and most water source heat pump applications. DXM2 Functional Start Troubleshooting Flow Chart... -
Page 22: Dxm2 Wiring Diagram With Motorized Modulating Water Valve - Optional 96B0005N62
Application, Operation, & Maintenance Manual Heat Controller, Inc. DXM2 Wiring Diagram with Motorized Modulating Water Valve - Optional 96B0005N62 This diagram includes typical wiring details but is not applicable to all units. For specifi c unit wiring, refer to the diagram or the units’... -
Page 23: Dxm2 Wiring Diagram (Standard Installation) - 96B0005N56
Heat Controller, Inc. Application, Operation, & Maintenance Manual DXM2 Wiring Diagram (Standard Installation) - 96B0005N56 This diagram includes typical wiring details but is not applicable to all units. For specifi c unit wiring, refer to the diagram or the units’... -
Page 24: Functional Troubleshooting
DXM2 UNIT CONTROLS Application, Operation, & Maintenance Manual Heat Controller, Inc. Functional Troubleshooting CAUTION! Fault Htg Clg Possible Cause Solution Check Line Voltage circuit breaker and disconnect CAUTION! Do not restart Check for line voltage between L1 and L2 on the contactor... - Page 25 Check for lockout codes - reset power Only Fan Runs Check compressor overload - replace if necessary Compressor overload Check thermostat wiring at DXM2 - put in Test Mode and Thermostat wiring jumper Y1 and R to give call for compressor...
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Page 26: Performance Troubleshooting
Check fan power enable relay operation (if present) Fan motor Check for line voltage at motor. Check capacitor Check thermostat wiring at or DXM2. Put in Test Mode Thermostat wiring and then jumper Y1 and W1 to R to give call for fan, compressor and electric heat. - Page 27 DXM2 UNIT CONTROLS Heat Controller, Inc. Application, Operation, & Maintenance Manual Notes:...
- Page 28 4/2012...