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Carrier COBRA 48/50HJ004-014 Installation And Service page 37

Energy recovery units
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Table 2 — Light Commercial Thermidistat (LCT) Operating Sequence and System Response
COOLING
Indoor Temperature Above 2nd Stage
Set Point
Humidity Low & OAT Low
Humidity Low & OAT High
Humidity High & OAT Low
Humidity High & OAT High
Indoor Temperature Between 1st and
2nd Stage Set Points
Humidity Low & OAT Low
Humidity Low & OAT High
Humidity High & OAT Low
Humidity High & OAT High
Indoor Temperature Below 1st Stage
Set Point
NOTE: OAT < 55° all compression off*
HEATING
Indoor Temperature Above 1st Set
Point
Indoor Temperature Between 1st and
2nd Stage Set Points
Indoor Temperature Below 2nd Stage
Set Point
COOLING
Indoor Temperature Above 2nd Stage
Set Point
Humidity Low & OAT Low
Humidity Low & OAT High
Humidity High & OAT Low
Humidity High & OAT High
Indoor Temperature Between 1st and
2nd Stage Set Points
Humidity Low & OAT Low
Humidity Low & OAT High
Humidity High & OAT Low
Humidity High & OAT High
Indoor Temperature Below 1st Stage
Set Point
Humidity Low
Humidity High
NOTE: OAT < 55° all compression off*
HEATING
Indoor Temperature Above 1st Stage
Set Point
Indoor Temperature Between 1st and
2nd Stage Set Points
OAT >Set Pt
OAT <Set Pt
Indoor Temperature Below 2nd Stage
Set Point
OAT >Set Pt
OAT <Set Pt
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).
UNOCCUPIED
ER Comp
ER Fans
On
On (cyc.)
Off
Off
Off
Off
Off
Off
Off
On (cyc.)
Off
Off
Off
Off
Off
Off
Off
Off
ER Comp.
ER Fans
Off
Off
Off
Off
Off
Off
OCCUPIED
ER Comp
ER Fans
On
On
On
On
On
On
On
On
Off
On
On
On
On
On
On
On
Off
On
On
On
ER Comp
ER Fans
Off
On
On
On
On
On
On
On
On
On
37
RT Comp 1
RT Comp 2
On w/o MM
Off
On w/o MM
w/o MM
On w MM
On w MM
On w MM
On w MM
Off
Off
On w/o MM
Off
On w MM
Off
On w MM
Off
Off
Off
RT Comps.
RT Fans
Off
Off
Off
On (cyc.)
Off
On (cyc.)
RT Comp 1
RT Comp 2
On w/o MM
On w/o MM
On w/o MM
On w/o MM
On w MM
On w MM
On w MM
On w MM
Off
Off
On w/o MM
Off
On w MM
Off
On w MM
Off
Off
Off
Off
Off
RT Comps
RT Fans
Off
On
Off
On
Off
On
Off
On
Off
On
RT Fans
RT Heat
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
On (cyc.)
Off
Off
Off
RT Heat
Off
On, 50%
On, 100%
RT Fan
RT Heat
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
RT Heat
Off
Off
On, 50%
On, 50%
On, 100%
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