Heat Controller manual DXM2 Controls, DXM2 UNIT CONTROLS, Heat Controller, Inc, Dip Switches

Application, Operation, & Maintenance Manual DXM2 UNIT CONTROLS Heat Controller, Inc.

DXM2 Controls

THERMOSTAT COMPATABILITY - IT IS STRONGLY RECOM- MENDED THAT A COMMUNICATING THERMOSTAT (7602-443)

BE USED WITH GEOMAX COMMUNICATING SYSTEMS FOR:

1.Four-wire connections between the thermostat, compres- sor section (HTS), and air handler (WDG).

2.Configuring, monitoring and diagnosing the system in PLAIN ENGLISH on the thermostat.

FIELD SELECTABLE INPUTS

Test mode: Test 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 delays are sped up 15 times. Upon entering test mode, the Status and Fault LED displays will change. The Status LED will either flash rapidly to indicate the control is in the test mode, or display a numeric flash code representing the current airflow if an ECM blower is connected and operating. The Fault LED will display the most recent fault condition in memory. Note: A flash code of 1 indicates there have been no faults stored in memory. For diagnostic ease at conventional thermostats, the alarm relay will also cycle during test mode. The alarm relay will cycle on and off similar to the Fault LED to indicate a code representing the last fault, at the thermostat.

The test mode can be exited by pressing the TEST pushbutton for 3 seconds. The test Mode can also be entered and exited by cycling the G input, 3 times within a 60 second time period.

During Test Mode, the control monitors to see if the LT1 and LT2 thermistors are connected and operating properly. If the control is in Test Mode, the control will lockout, with Code 9, after 60 seconds if:

a)the compressor is On in Cooling Mode and the LT1 sensor is colder than the LT2 sensor. or,

b)the compressor is On in Heating Mode and the LT2 sensor is colder than the LT1 sensor.

Retry Mode: If the control is attempting a retry of a fault, the Fault LED will slow flash (slow flash = one flash every 2 seconds) to indicate the control is in the process of retrying.

Field Configuration Options - Note: In the following field configuration options, jumper wires should be clipped ONLY when power is removed from the DXM2 control.

Note: Jumper 3 must not be clipped prior to adding antifreeze to the water loop. Antifreeze protection to 10°F required. Clipping JW3 without antifreeze may result in freeze damage and will void the unit warranty.

Water coil low temperature limit setting: Jumper 3 (JW3- LT1 Low Temp) provides field selection of temperature limit

setting for LT1 of 30°F or 10°F [-1°F or -12°C] (refrigerant temperature).

Not Clipped = 30°F. Clipped = 10°F.

Alarm Relay Setting - Jumper 1 (JW1-AL2 Dry) provides field selection of alarm function when Alarm Relay is energized.

Not Clipped = AL1 connected to R (24VAC) with Alarm Relay active.

Clipped = Dry contact connection between AL1 and AL2 with Alarm Relay active.

JUMPERS (Set at Factory)

A0-2: Configure Modulating Valve (Optional)

Set A0-2 jumper (see Figure on page 5) to “IOV” if using Internal Modulating Motorized Valve (optional).

DIP SWITCHES

Note: In the following field configuration options, DIP switches should only be moved when power is removed from the DXM2 Control to ensure proper operation.

DIP Package #1 (S1)

DIP Package #1 is 8 position and provides the following setup selections.

DIP 1.1: Unit Performance Sentinel Disable - Provides field selection to disable the UPS feature.

On = Enabled. Off = Disabled.

DIP 1.2: Compressor Relay Staging Operation - Provides selection of Compressor Relay staging operation. The Compressor Relay can be selected to turn on with Stage 1 or Stage 2 call from the thermostat. This is used with Dual Stage units (2 compressors where 2 DXM2 Controls are being used) or with master/slave applications. In master/slave applications, each compressor and fan will stage according to its appropriate DIP 1.2. If set to stage 2, the compressor will have a 3 second on-delay before energizing during a Stage 2 demand. Also, if set for stage 2, the Alarm Relay will NOT cycle during Test Mode.

On = Stage 1. Off = Stage 2.

DIP 1.3: Thermostat Type (Heat/Cool) - Provides selection of thermostat type. Heat Pump or Heat/Cool thermostats can be selected. When in Heat/Cool Mode, Y1 is input call for Cooling Stage 1, Y2 is input call for Cooling Stage 2, W1 is input call for Heating Stage 1, and O/W2 is input call for Heating Stage 2. In Heat Pump Mode, Y1 is input call for Compressor Stage 1, Y2 is input call for Compressor Stage 2, W1 is input call for Heating Stage 3 or Emergency Heat, and O/W2 is the input call for RV (heating or cooling dependent upon DIP 1.4).

6