Heat Controller HTS SERIES manual DXM2 Controls, Unit Operation

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A

R e v. : 0 3 A u g u s t , 2 0 1 2

DXM2 Controls

DXM2 Control

DXM2 is the next generation in controls is capable of 2-way communication between itself and smart components, like the communicating thermostat, fan motor and configuration/ diagnostic tool.

For most residential applications, configuration, monitoring and diagnostics can be done from the thermostat / service tool and there’s no need to read LEDs and change DIP switches.

For details on user settings, refer to User Manual (part #:

For details on Installer settings (not to be used by consumers), refer to Installer manual (part #:

For details on installer/service settings on the configuration/ diagnostic tool, refer to operation manual (part #:

DXM2 Control Start-up Operation

The control will not operate until all inputs and safety controls are checked for normal conditions. The compressor will have a 5 minute anti-short cycle delay at power-up. The first time after power-up that there is a call for compressor, the compressor will follow a 5 to 80 second random start delay. After the random start delay and anti-short cycle delay,

the compressor relay will be energized. On all subsequent compressor calls, the random start delay is omitted.

Test Mode button:

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.

Figure 26: Test Mode Button

For further details on the DXM2 control, refer to the DXM2 Application, Operation and Maintenace Manual and it is shipped with the unit)

Thermostat compatibility

It is strongly recommended that GeoMax2 communicating

					P4			(240Vac)
Gnd	B-	A+		24V		(240Vac)
							N.O.	N.C.
			P5
							Com	N.O.
							Fan Enable	Fan Speed

thermostat be used with DXM2 control, to ensure easy configuration, monitoring and diagnostics, in PLAIN English, on the thermostat. For example, Airflow can NOT be configured without a communicating thermostat or Configuration/ Diagnostic tool for use with GeoMax2.

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

Pust test button to enter Test Mode and speed-up timing and delays for 20 minutes.

Table 8: Unit Operation

Test P12

P8

12V

IN

OUT

Gnd

NC

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 [-1°C]. Clipped = 10°F [-12°C].

A0-2: Configure Modulating Valve (field installed acces- sory)

Set A0-2 jumper to “IOV” if using Modulating Motorized Valve as field installed accessory

DIP Switches - For residential applications, all configuration can be performed in PLAIN ENGLISH on the thermostat. No DIP switch changes are required and no LEDs to be observed.

CAUTION!

CAUTION! Do not restart units without inspection and remedy of faulting condition. Equipment damage may occur.

Conventional	Unit
T-stat signal
	ECM fan
(Non-Communicating)
G	Fan only
G, Y1	Stage 1 heating1
G, Y1, Y2	Stage 2 heating1
G, Y1, Y2, W	Stage 3 heating1
G, W	Emergency heat
G, Y1, O	Stage 1 cooling2
G, Y1, Y2, O	Stage 2 cooling2

1Stage 1 = 1st stage compressor, 1st stage fan operation Stage 2 = 2nd stage compressor, 2nd stage fan operation Stage 3 = 2nd stage compressor, auxiliary electric heat, 3rd stage fan operation

2Stage 1 = 1st stage compressor, 1st stage fan operation, reversing valve

Stage 2 = 2nd stage compressor, 2nd stage fan operation, reversing valve

26 Heat Controller, Inc. Water-Source Heating and Cooling Systems