Economi$Er Systems - Carrier 48TC 17 Series Service And Maintenance Instructions

ECONOMI$ER SYSTEMS

IMPORTANT: Any economizer
economizer requirements as laid out in California's Title
24 mandatory section
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.
The 48TC units may be equipped with a factory−installed
or accessory (field−installed) EconoMi$er system. Two
types are available: with a logic control system
(EconoMi$er IV) and without (EconoMi$er2). See Fig. 61
for component locations on each type. See Fig. 62 and
Fig. 63 for EconoMi$er section wiring diagrams. Both
EconoMi$ers use direct−drive damper actuators.
LEGEND
DCV— Demand Controlled Ventilation
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor-Air Temperature
POT — Potentiometer
RAT — Return-Air Temperature
that meets
120.2 (fault detection and
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
8
7
Potentiometer Defaults Settings:
Power Exhaust Middle
Minimum Pos. Fully Closed
DCV Max. Middle
DCV Set Middle
Enthalpy C Setting
Fig. 62 − EconoMi$er IV Wiring
the
WIRING
HARNESS
ACTUATOR
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
Fig. 61 − EconoMi$er Component Locations
NOTES:
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
position.
51
ECONOMIER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
EconoMi$er IV
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
EconoMi$er2
C06021
C06022
C06028