Economizer Systems - Carrier 48TC 04 Series Service And Maintenance Instructions

ECONOMIZER SYSTEMS

The 48TC units may be equipped with a factory- - installed
or accessory (field- - installed) economizer system. Two
types are available: with a logic control system
(EconoMi$er IV) and without
(EconoMi$er2). See Fig. 81 and Fig. 82 for component
locations on each type. See Fig. 83 and Fig. 84 for
economizer section wiring diagrams.
Both economizers use direct- - drive damper actuators.
IMPORTANT: Any economizer
economizer requirements as laid out in California's Title
24 mandatory section 120.2 (fault detection and
diagnostics) and/or prescriptive section 140.4 (life- - cycle
tests, damper leakage, 5 year warranty, sensor accuracy,
etc), will have a label on the economizer. Any economizer
without this label does not meet California's Title 24. The
five year limited parts warranty referred to in section
140.4 only applies to factory installed economizers. Please
refer to your economizer on your unit.
8
7
LEGEND
DCV— Demand Controlled Ventilation
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor-Air Temperature
POT — Potentiometer
RAT — Return-Air Temperature
a control system
that meets the
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
Potentiometer Defaults Settings:
NOTES:
Power Exhaust Middle
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
Minimum Pos. Fully Closed
DCV Max. Middle
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
DCV Set Middle
Enthalpy C Setting
3. For field-installed remote minimum position POT, remove black wire jumper
Fig. 83 - - EconoMi$er IV Wiring
WIRING
HARNESS
ACTUATOR
Fig. 81 - - EconoMi$er IV Component Locations
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
Fig. 82 - - EconoMi$er2 Component Locations
enthalpy or dry bulb.
supply, it cannot have the secondary of the transformer grounded.
between P and P1 and set control minimum position POT to the minimum
position.
78
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
C06021
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
C06022
C06028