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 24VAC (minimum 1 second) then the OVR input is recognized as a Night Setback Override signal and the DXM2Control reverts from Night Setback and begins monitoring thermostat inputs for heating and cooling calls for a 2 hour override period. If NSB is connected to ground “C”, then if OVR is continuously connected to 24VAC, then the OVR input is recognized as a call for NLL Staged Heating and the control enters NLL Staged Heating.
ESD – ESD is the input for Emergency Shutdown Mode. When the ESD input is connected to Ground “C”, all inputs are ignored and all outputs are turned off. There will be a random start timer when coming back from ESD.
H – The H input function is determined by the setting of DIP2.7, assuming the control is not controlling a internal flow center or an accessory relay is not configured for Whole House Dehumidification or humidifier operation.
If DIP2.7 = on then the H input is defined as Automatic Dehumidification Mode and is used as an “automatic”
Table 5: System Inputs with the resulting demand.
Table 5 describes demand changes with differing system input (ESD, NSB, OVR) and DIP input settings. Resulting Demand #1 is derived from Table 4.
Resulting Demand | System Inputs |
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#1 (From Table 4) | ESD | NSB | OVR | |||
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- | X | - | - | - | ESD | |
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Invalid | - | - | - | - | Invalid | |
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All (Excluding Invalid) | - | - | - | - | All (Excluding Invalid) | |
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All (Excluding Invalid) | - | - | M | - | All (Excluding Invalid) | |
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C1, C2 | - | - | X | - | Invalid | |
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OFF, F, H1, H2, or H3 | - | - | X | - | NLL Staged Heating | |
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EH | - | - | X | - | EH | |
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All (Excluding Invalid) | - | X | - | Mechanical | Standby/OFF | |
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| All for 2 hours and | |
All (Excluding Invalid) | - | X | M | Mechanical | then revert to Stand- | |
by/OFF (Excluding | ||||||
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| Invalid) | |
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C1, C2 | - | X | X | Mechanical | Invalid | |
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OFF, F, H1, H2, or H3 | - | X | X | Mechanical | NLL Staged Heating | |
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EH | - | X | X | Mechanical | EH | |
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All (Excluding Invalid) | - | X | - | Digital / | All (Excluding Invalid) | |
Comm | ||||||
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All (Excluding Invalid) | - | X | M | Digital / | All (Excluding Invalid) | |
Comm | ||||||
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C1, C2 | - | X | X | Digital / | Invalid | |
Comm | ||||||
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OFF, F, H1, H2. or H3 | - | X | X | Digital / | NLL Staged Heating | |
Comm | ||||||
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EH | - | X | X | Digital / | EH | |
Comm | ||||||
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“M” is momentary input “X” is continuous input
counterpart to DIP1.5, meaning if H is connected to 24VAC then the selected fan outputs will operate using dehumidification speeds and airflow settings for cooling. If H is not connected to 24VAC then the selected fan outputs will operate using normal speeds and airflow settings for cooling.
If DIP2.7 = off then the H input is defined as High Speed Fan input and is used as an input to call for High Speed Fan. If the control is in normal operating modes such as Standby, Cooling or Heating AND the H input is connected to 24VAC, then the selected fan outputs will operate using high speed, or high speed airflows at all times (this operation is a high speed fan version of the G input).
Other Outputs
Electric Heat – Outputs EH1 and EH2 turn on whenever the DXM2 Control is in the following modes: Heating Stage 3, Emergency Heat, and Boilerless Operation.
Status LED – The Status LED is green. The Status LED indicates the operating status of the DXM2 Control. See Table 4: “LED and Alarm Relay Operation”.
Fault LED – The Fault LED is red. The Fault LED displays the current operating status of the control, or flashes the corresponding code for the last fault that has occurred
if the test mode is active. If there is no fault in memory, then the Fault LED will flash Code 1. If the Fault type is “Primary” (HP, LP, LT1, LT2, or CO) then the Fault type will always be retained in memory (Primary faults will overwrite Secondary faults). If the Fault type is “Secondary” (Over/
Table 6: "H" input with resulting demand modes.
Table 6 describes demand changes with “H” input and DIP
Resulting Demand | H | Auto Dehum / F2 | Resulting Demand # 3 (After | |
#2 (From Table 5) | DIP 2.7 | DIP | ||
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Standby/OFF | X | Auto Dehum Mode | Standby/OFF with Auto | |
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Dehum enabled |
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Standby/OFF | X | High Fan Mode | F2 | |
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F1 | X | Auto Dehum Mode | F1 with Auto Dehum enabled | |
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F1 | X | High Fan Mode | F2 | |
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C1 | X | Auto Dehum Mode | C1 with fan destage | |
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C1 | X | High Fan Mode | *Cooling with High Fan | |
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C2 | X | Auto Dehum Mode | C2 with fan destage | |
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C2 | X | High Fan Mode | *Cooling with High Fan | |
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H1 | X | Auto Dehum Mode | H1 | |
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H1 | X | High Fan Mode | Heating with High Fan | |
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H2 | X | - | H2 | |
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H3 | X | - | H3 | |
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EH | X | - | EH | |
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Invalid | - | - | Invalid |
* = signifies that High Fan is locked on regardless of any Dehum demands
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