Economizer Systems; Comfortlink (Factory Option); Rtu Open Control System; Vfd Operation With Remote Keypad - Carrier 48LC Series Service And Maintenance Instructions

ECONOMIZER SYSTEMS

The 48LC 04- - 06 units may be equipped with a
factory- - installed or accessory (field- - installed) economizer
system. Two types are available: with a logic control
system (EconoMi$er X) and without a control system
(EconoMi$er2, for use with external control systems such
as RTU Open). See Fig. 42 for component locations on
EconoMi$er2. See Fig. 43 for EconoMi$er2 wiring
diagrams.
For details on operating 48LC units equipped with the
factory- - installed EconoMi$er
EconoMi$er X Factory- - Installed Option Low Leak
Economizer for 2 Speed SAV
Systems (Catalog No. LLECON- - 02SI, or later).
NOTE 1
RUN
NOTE 2
50HJ540573
ACTUATOR
ASSEMBL Y
DIRECT DRIVE
ACTUATOR
NOTES:
1. Switch on actuator must be in run position for economizer to operate.
2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor

ComfortLINK (Factory Option)

For details on operating 48LC 04- - 06 units equipped with the
factory installed ComfortLINK option, refer to Controls,
Start- - Up, Operation and Troubleshooting for 48/50LC
04- - 06 Single Package Rooftop Unit with ComfortLINK
Controls (Catalog No. 48- - 50LC- - C01T, or later).
RTU Open (Factory Option)
For details on operating 48LC 04- - 06 units equipped with the
factory installed RTU Open option, refer to
Start- - Up, Operation and Troubleshooting for 48/50TC04- - 30,
50TCQ04- - 24, 48/50HC04- - 28,
04- - 06 Factory Installed Option RTU Open (Catalog No.
48- - 50HCTQ- - 02T, or later).
X option, refer to
(Staged Air Volume)
t
500 OHM
RESISTOR
OAT SENSOR
Fig. 43 - - EconoMi$er2 with 4 to 20 mA Control Wiring
Controls,
50HCQ04- - 12, 48/50LC
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
Fig. 42 - - EconoMi$er2 Component Locations
VIOLET
PINK
4-20mA SIGNAL

VFD Operation with Remote Keypad

All 48LC size 04- - 06 units are equipped with a VFD
(Variable Frequency Drive) to automatically adjust the
indoor fan motor speed in sequence with the unit's
ventilation, cooling and heating operation. The VFD
keypad is included as standard on electro mechanical and
RTU Open models.
For details on using the VFD keypad, see the APPENDIX
at the end of the unit's Installation Instructions (refer to
48LC Single Package Rooftop Gas Heating/Electric
Cooling Unit with Puron (R- - 410A) Refrigerant, Sizes: 04,
05, 06).
34
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
C06022
BLACK
4
TRANSFORMER
GROUND
3
5
BLUE
2
8
6
7
RED
24 VAC
1
10
11
9
WHITE
12
ECONOMI$ER2 PLUG
C14042