Heat Controller EKTH Discharge Air Flow Grille Removal, Remote Control Inputs, Remote Thermostat

Operating Instructions

3.Remove the four (4) nuts which secure the discharge air grille to the cabinet front.

Discharge Air Flow Grille Removal

4.Rotate the grille 180° clockwise.

5.Reinstall the nuts securing the discharge air grille to the cabi- net front. Reinstall the cabinet front on the unit.

REMOTE THERMOSTAT

To operate this unit with a “manufacturer-approved” remote thermostat, configure the control to be operated by the remote thermostat. Enter configuration mode C1 and then select option Code L5 (see Configuration Settings in back of manual). When in the remote mode, the unit will only respond to the thermostat inputs (terminal strip positions GL (or GH), W2, Y/W1, and B* shown in “Control Board User Inputs” illustration). NOTE: Once configuration C1 with option code L5 has been selected, the control touchpad will no longer accept inputs other than configu- ration and diagnostics modes. The room occupant must operate the unit at the remote mounted thermostat.

NOTE: In remote mode, the 3-minute compressor time delay, the random restart feature and the freeze protection feature are all active (see Unit Features section).

THERMOSTAT LOCATION

This unit is designed to be operated with remote wall mounted thermostats. For further information on thermostats approved for use with this unit, contact your sales representative.

For best performance results, the thermostat should be located approximately five feet above the floor on a vibration free, inside wall in an area with good air circulation.

Do not install the thermostat where it may be affected by the following:

•Dead spots behind doors, in corners or under cabinets

•Hot or cold drafts from air ducts

•Radiant heat from the sun, appliances, or fireplaces

•Concealed pipes and chimneys

•Unheated (uncooled) areas behind the thermostat, such as an outside walls

Consult the instruction sheet packaged with the thermostat for further details on mounting and operation.

REMOTE THERMOSTAT OPERATION

Approved thermostats vary slightly in construction and, with few exceptions, are operated similarly. The following operational description pertains to approved nonprogrammable thermostats that energize G in Heat and Cool mode.

HEAT/OFF/COOL Switch

•OFF - cooling and heating functions are defeated.

•HEAT - the selected room temperature is maintained by cy- cling either in the heat pump mode or electric strip heat. A PTH unit is switched from the heat pump mode to electric strip heat when the coil temperature is 20°F or when the heat pump cannot keep up with the heating load and a two stage thermostat is used.

•COOL - the selected room temperature is maintained by cycling the air conditioner.

Table 4 summarizes the thermostat input combinations and the respective unit functions. The following wiring schematic illustra- tions show wiring schematics for heat pump and straight cool units with electric resistance heat, respectively.

		Heat Pump	Electric Heat
Unit Function		Thermostat	Thermostat
		Input	Input
		R Terminal to:	R Terminal to:
OFF		NONE	NONE
HEAT	Stage 1	GL*, Y/W1, B**, O	GL* Y/W1, B**, or GL*, W2, O
	Stage 2	GL*, W2	n/a
COOL		GL*, Y/W1, B**, O	GL*, Y/W1

*or GH depending on speed required

**If configured, B and O can be used interchangeably.

Table 4 - Remote Control Inputs

NOTE: The PTAC Wire Harness Kit (PWHK01C) is required for remote thermostat options.

ADDITIONAL NOTES:

1.For heat pump operation, a room thermostat with a B** (heat- ing changeover) terminal is required. This will mean that some “auto changeover” thermostats cannot be used, as many of them either do not have a B** terminal, or else energize the B** terminal continuously when in the “auto” position.

2.Additional wiring should be run for future changeover to Heat Pump or thermostat options.

**If configured, B and O input terminals can be used interchangeably.

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