Carrier 48/50HJ004-014 specifications Cooling, Heating

Table 2 — Light Commercial Thermidistat (LCT) Operating Sequence and System Response

UNOCCUPIED

	COOLING	ER Comp	ER Fans	RT Comp 1	RT Comp 2	RT Fans	RT Heat
Indoor Temperature Above 2nd Stage
Set Point
	Humidity Low & OAT Low	On	On (cyc.)	On w/o MM	Off	On (cyc.)	Off
	Humidity Low & OAT High	Off	Off	On w/o MM	w/o MM	On (cyc.)	Off
	Humidity High & OAT Low	Off	Off	On w MM	On w MM	On (cyc.)	Off
	Humidity High & OAT High	Off	Off	On w MM	On w MM	On (cyc.)	Off
Indoor Temperature Between 1st and
2nd Stage Set Points
	Humidity Low & OAT Low	Off	On (cyc.)	Off	Off	On (cyc.)	Off
	Humidity Low & OAT High	Off	Off	On w/o MM	Off	On (cyc.)	Off
	Humidity High & OAT Low	Off	Off	On w MM	Off	On (cyc.)	Off
	Humidity High & OAT High	Off	Off	On w MM	Off	On (cyc.)	Off
Indoor Temperature Below 1st Stage		Off	Off	Off	Off	Off	Off
Set Point
NOTE: OAT < 55° all compression off*
	HEATING	ER Comp.	ER Fans	RT Comps.	RT Fans	RT Heat
Indoor Temperature Above 1st Set		Off	Off	Off	Off	Off
Point
Indoor Temperature Between 1st and		Off	Off	Off	On (cyc.)	On, 50%
2nd Stage Set Points
Indoor Temperature Below 2nd Stage		Off	Off	Off	On (cyc.)	On, 100%
Set Point
			OCCUPIED
	COOLING	ER Comp	ER Fans	RT Comp 1	RT Comp 2	RT Fan	RT Heat
Indoor Temperature Above 2nd Stage
Set Point
	Humidity Low & OAT Low	On	On	On w/o MM	On w/o MM	On	Off
	Humidity Low & OAT High	On	On	On w/o MM	On w/o MM	On	Off
	Humidity High & OAT Low	On	On	On w MM	On w MM	On	Off
	Humidity High & OAT High	On	On	On w MM	On w MM	On	Off
Indoor Temperature Between 1st and
2nd Stage Set Points
	Humidity Low & OAT Low	Off	On	Off	Off	On	Off
	Humidity Low & OAT High	On	On	On w/o MM	Off	On	Off
	Humidity High & OAT Low	On	On	On w MM	Off	On	Off
	Humidity High & OAT High	On	On	On w MM	Off	On	Off
Indoor Temperature Below 1st Stage
Set Point
	Humidity Low	Off	On	Off	Off	On	Off
	Humidity High	On	On	Off	Off	On	Off
NOTE: OAT < 55° all compression off*
	HEATING	ER Comp	ER Fans	RT Comps	RT Fans	RT Heat
Indoor Temperature Above 1st Stage		Off	On	Off	On	Off
Set Point
Indoor Temperature Between 1st and
2nd Stage Set Points
	OAT >Set Pt	On	On	Off	On	Off
	OAT <Set Pt	On	On	Off	On	On, 50%
Indoor Temperature Below 2nd Stage
Set Point
	OAT >Set Pt	On	On	Off	On	On, 50%
	OAT <Set Pt	On	On	Off	On	On, 100%
	LEGEND
Comp — Compressor
ER	— Energy Recovery section

MM— MoistureMi$er™ Dehumidification Device OAT — Outdoor-Air Temperature

RT — Rooftop Unit Set Pt — Set Point

*Unless unit compressor has been rewired as described in Step 11 (page 29).

37