User manual

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 RV relay may be

on if appropriate inputs are present. If there is demand for

constant fan, the appropriate fan output(s) will be activated

for low speed operation, or constant fan airﬂ ow. If there is

demand for constant high speed fan, the appropriate fan

output(s) will be activated for high speed operation, or high

speed constant fan airﬂ ow.

Note: DIP1.5 (Dehum Fan Mode Select) has no effect

upon constant fan operation.

The RV relay will not directly track the input demands for

RV, the DXM2 Control will employ “smart RV” control.

This ensures that the RV will only switch positions if the

thermostat has called for a Heating/Cooling Mode change.

Heating Stage 1 - In Heating Stage 1 Mode, the selected

Fan output(s) and the Compressor relay are turned on

immediately. If conﬁ gured as Stage 2 (DIP1.2 = off), then

the Compressor and Fan will not turn on until there is Stage

2 demand. The Compressor relay is turned off immediately

when the Heating Stage 1 demand is removed. The

selected Fan output(s) will turn off after the selected

heating blower off delay, and the control then reverts to

Standby Mode. If there is a Master/Slave situation or a

Dual Compressor situation, all Compressor relays and

related functions will track with their associated DIP1.2.

Heating Stage 2 – In Heating Stage 2 Mode, the selected

Fan output(s) and Compressor relays remain on. The

Compressor Speed relay is turned on, and multi–stage fan

conﬁ gurations switch to the appropriate operating speed

for Heating Stage 2 immediately. The Compressor Speed

relay is turned off immediately when the Heating Stage 2

demand is removed, and multi–speed fan conﬁ gurations

switch to the appropriate operating speed for Heating

Stage 1 immediately, and the control reverts to Heating

Stage 1 Mode. If there is a Master/Slave situation or a Dual

Compressor situation, all Compressor relays and related

functions will track with their associated DIP1.2.

Heating Stage 3 – In Heating Stage 3 Mode, the selected

Fan output, Compressor, and Compressor Speed relays

will remain on. The EH1 output will turn on immediately,

and if the control is operating an ECM Blower, the airﬂ ow

DXM2 Controls

Table 3: LED and Alarm Relay Output Table