Sears EF12F1900A2, EF20N2600A2, EF16J2200A2 Heat Pump With Electric Heat, Limit Operation

I Blower Coils

Mode

Constant Blower Fan Switch ON)

Thermostat calls for Heat

Sequence

Thermostat	to Con-
trol Board	24 volt	State
J		Control
		Electric
G		On
		Off
G&W1	&W2	On
		Off

Installation Instructions

Of Operation

Control Function

Heat Only

Fan On.

Fan Off.

Fan On, 1st Stage Of Heat On, then 2nd Stage Of Heat On.

2nd thenlst Stage Of Heat Off. 6 sec delay, then Fan Off.

Cooling Only Unit With Electric Heat

Constant Blower Fan Switch ON)

Cooling Only Unit (Thermostat calls for

Cooling)

Cooling Only Unit (Thermostat calls for Heat)

G	On
	Off
Y&G	On
	Off
G&W1 &W2	On
	Off

Fan On.

Fan Off.

Compressor On, Fan On.

Compressor Off, 60 Second Delay - Then Fan Off.

Fan On, 1st Stage Of Heat On, then 2nd Stage Of Heat On.

2rid thenlst Stage Of Heat Off. 6 sec delay, then Fan Off.

Heat Pump With Electric Heat

Heat Pump	Y&G&O	On	Compressor	On, Reversing	Valve	Energized,	Fan On.
(Thermostat	calls for	Off	Compressor	Off, 60 Second	Delay	And Then	Fan Off.
Cooling)
Heat Pump	Y & G	On	Compressor	On, Fan On
(Thermostat	calls for
Heat)

Heat Pump cannot			Y & G & Wl & W2	On
maintain proper temp.
Electric	Heat	Tempera-		Off
ture satifised
Heat Pump			Y&G&O&WI&W2	On
(Goes	into Defrost
Mode)				Off
Heat Pump			Y&G	Off
Room	temp.	satifised)
Heat Pump			G&W1 &W2	On
(Emergency		Heat)		Off

1st Stage Of Heat On, then 2nd Stage Of Heat On

2rid then 1st Stage Of Heat Off

Reversing valve switches unit to cooling, 1st Stage Of Heat On, then 2nd Stage Of Heat On

Reversing valve switches back to heating, 2rid then 1st Stage Of Heat Off

Compressor Off, 60 Second Delay And Then Fan Off.

Fan On, 1st Stage Of Heat On, then 2nd Stage Of Heat On. 2rid then 1st Stage Of Heat Off. 6 sec delay, then Fan Off.

NOTE: Electric Heat Elements are controlled by relays with a delay sequence from the logic board to provide sequencing between elements.

Limit Operation

The temperature limit responds to over-temperature conditions in the air duct. Ifthetemperaturelimittrips, theelectricheaterrelayswill

be de-energized and the fan relay will be energized. Once the limit resets, the control will resume normal operation. If the limit trips four times during a single call for heat, the control will go into a 1 hour soft lockout. During the soft lockout, the fan relay will respond to thermostat inputs but the heater relays are disabled. If the control detects a limit trip du ring the soft lockout, the control will go into a hard lockout. Once in a hard lockout, the fan relay is locked on and the heater relays are disabled. Turning the power to the unit off and then on will clear this state.

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